Production of artemisinin and its derivatives in hairy roots of Artemisia dubia induced by rolA gene transformation

International Nuclear Information System (INIS)

Amanullah, M.; Mirza, B.; Zia, M.

2016-01-01

Artemisinin and its derivatives are phytochemical constituents of genus Artemisia. Demand of these plant secondary metabolitesis increasing due to their immense therapeutic significance. Besides their established antimalarial role, recent studies have also disclosed their anticancer potentials. It has made imperative to develop new and efficient sources of these compounds. Inherent synthetic challenges give biological sources preference over chemical synthesis of artemisinin and its derivatives. Therefore, genetic improvement of plants and, rather less preferentially, microbes is focus of current research to gain increase productivity of these valuable drugs. This study has analyzed A. dubiaas potential source of artemisinin and its derivatives. Transformation of Artemisia dubia was carried out using A. tumefaciens strain LBA 4404 containing rolA gene constructed on pRB 29. Healthy and acclimatizable transgenic plants were produced using optimized concentrations of BAP and NAA. Previously acclimatized rol ABC transgenic plants were also In vitro regenerated for comparative analysis of artemisinin and its derivatives. PCR amplification of rolA gene was done to confirm the integration of T-DNA in transgenic plants.TLC analysis was performed to evaluate comparative production of artemisinin and derivatives in rolA and rol ABC transgenic A. dubia. It revealed that rolA transgenic plants contain comparable amounts of these metabolites. Both type of transgenic plants manifested the enhancement of other uncharacterized compounds as well. Besides systematic optimization of In vitro regenerative protocol for Artemisia dubia, relative regeneration ability of rol transgenic and controlplants was also assessed at four regenerative stages. It was observed that unlike control, rol transgenic plants showed best root induction only on combination of auxins and cytokines. It was concluded that rol genes transformation of plants is an efficient tool to enhance their secondary

Crystal structures of the transcriptional repressor RolR reveals a novel recognition mechanism between inducer and regulator.

Directory of Open Access Journals (Sweden)

De-Feng Li

Full Text Available Many members of the TetR family control the transcription of genes involved in multidrug resistance and pathogenicity. RolR (ResorcinolRegulator, the recently reported TetR-type regulator for aromatic catabolism from Corynebacterium glutamicum, distinguishes itself by low sequence similarities and different regulation from the previously known members of the TetR family. Here we report the crystal structures of RolR in its effector-bound (with resorcinol and aop- forms at 2.5 Å and 3.6 Å, respectively. The structure of resorcinol-RolR complex reveal that the hydrogen-bonded network mediated by the four-residue motif (Asp94- Arg145- Arg148- Asp149 with two water molecules and the hydrophobic interaction via five residues (Phe107, Leu111, Leu114, Leu142, and Phe172 are the key factors for the recognition and binding between the resorcinol and RolR molecules. The center-to-center separation of the recognition helices h3-h3' is decreased upon effector-binding from 34.9 Å to 30.4 Å. This structural change results in that RolR was unsuitable for DNA binding. Those observations are distinct from that in other TetR members. Structure-based mutagenesis on RolR was carried out and the results confirmed the critical roles of the above mentioned residues for effector-binding specificity and affinity. Similar sequence searches and sequence alignments identified 29 RolR homologues from GenBank, and all the above mentioned residues are highly conserved in the homologues. Based on these structural and other functional investigations, it is proposed that RolR may represent a new subfamily of TetR proteins that are invovled in aromatic degradation and sharing common recognition mode as for RolR.

Agrobacterium rhizogenes rolB gene affects photosynthesis and chlorophyll content in transgenic tomato (Solanum lycopersicum L.) plants.

Science.gov (United States)

Bettini, Priscilla P; Marvasi, Massimiliano; Fani, Fabiola; Lazzara, Luigi; Cosi, Elena; Melani, Lorenzo; Mauro, Maria Luisa

2016-10-01

Insertion of Agrobacterium rhizogenes rolB gene into plant genome affects plant development, hormone balance and defence. However, beside the current research, the overall transcriptional response and gene expression of rolB as a modulator in plant is unknown. Transformed rolB tomato plant (Solanum lycopersicum L.) cultivar Tondino has been used to investigate the differential expression profile. Tomato is a well-known model organism both at the genetic and molecular level, and one of the most important commercial food crops in the world. Through the construction and characterization of a cDNA subtracted library, we have investigated the differential gene expression between transgenic clones of rolB and control tomato and have evaluated genes specifically transcribed in transgenic rolB plants. Among the selected genes, five genes encoding for chlorophyll a/b binding protein, carbonic anhydrase, cytochrome b 6 /f complex Fe-S subunit, potassium efflux antiporter 3, and chloroplast small heat-shock protein, all involved in chloroplast function, were identified. Measurement of photosynthesis efficiency by the level of three different photosynthetic parameters (F v /F m , rETR, NPQ) showed rolB significant increase in non-photochemical quenching and a, b chlorophyll content. Our results point to highlight the role of rolB on plant fitness by improving photosynthesis. Copyright © 2016 Elsevier GmbH. All rights reserved.

EL PERFIL DEL EDITOR DE JUEGOS DE ROL

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Héctor Sevillano Pareja

2010-11-01

Full Text Available El presente trabajo estudia y analiza, a través de diversas encuestas personalizadas, el perfil tipo que presentan los profesionales que se dedican al arte de editar libros de rol en España.

Pensioen, Keuze en de Rol van de Pensioenprofessional

NARCIS (Netherlands)

Ponds, Eduard; Steenbeek, O.W.; Vonken, Joyce

Dit stuk vat de resultaten samen van een aantal recente onderzoeken naar de mogelijke rol van de professional in het ondersteunen van deelnemers bij de omgang met keuzeopties in pensioenen. Neuromarketing onderzoek (hersenscans) bevestigt dat deelnemers tweeslachtig zijn ten aanzien van

La incidencia del rol docente en el desarrollo del conocimiento metacomprensivo

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Paula Ascorra

2008-10-01

Full Text Available El presente artículo expone un estudio exploratorio y preliminar que busca indagar la relación existente entre el rol docente -definido como un facilitador o mediador de aprendizaje de los alumnos- y la capacidad metacomprensiva lectora. La muestra estuvo compuesta por 106 sujetos quienes volcaron sus percepciones acerca del rol que cumplían sus docentes en el Inventario de Identificación de Conductas del Rol del profesor como Mediador de Aprendizaje (ICRM y su conocimiento metacomprensivo en el cuestionario MCL que mide tal variable. Los resultados muestran una relación entre el profesionalismo del docente y el desarrollo estratégico de los alumnos y entre afectividad y tarea grupal con la capacidad de comprender la tarea lectora, indicando que, más allá de esta instrucción directa, un profesor por el solo hecho de presentarse como mediador y de adoptar una conducta estratégica, ya favorece un incremento en el conocimiento metacomprensivo de sus alumnos.

The Agrobacterium rhizogenes oncogenes rolB and ORF13 increase formation of generative shoots and induce dwarfism in Arabidopsis thaliana (L.) Heynh.

Science.gov (United States)

Kodahl, Nete; Müller, Renate; Lütken, Henrik

2016-11-01

Plant transformation with the wild type Ri plasmid T-DNA of Agrobacterium rhizogenes is a promising method for breeding of compact plants and has been the subject of numerous studies. However, knowledge concerning the isolated functions of single genes and ORFs from the plasmid is limited. The rolB and ORF13 oncogenes of A. rhizogenes show considerable promise in plant breeding, but have not been comprehensively studied. Detailed information regarding the morphological impact of specific genes of the Ri plasmid will allow for optimized targeted breeding of plants transformed with the wild type Ri plasmid T-DNA. rolB and ORF13 were recombined into the genome of Arabidopsis thaliana using Gateway ® cloning and the effect on plant growth was assessed biometrically throughout the plants' life cycle. rolB-lines exhibited dwarfing, early necrosis of rosette leaves, altered leaf and flower morphology, and developed an increased number of inflorescences per rosette area compared to the wild type. ORF13-lines were extremely dwarfed, attaining only ca. 1% of the rosette area of the wild type, leaf and flower size was reduced, and the shape modified. The study documents that the traits inferred by the rolB oncogene yield plants with increased formation of generative shoots, but also result in some degree of premature senescence of vegetative organs. The extreme dwarfism seen in ORF13-lines indicate that this oncogene may be more important in the dwarfing response of plants transformed with the wild type Ri plasmid T-DNA than previously assumed and that transformation with this oncogene induces a very compact phenotype. Copyright © 2016 Elsevier Ireland Ltd. All rights reserved.

Le colonel Rol-Tanguy

OpenAIRE

Bourderon, Roger

2009-01-01

Ouvrier métallurgiste, syndicaliste et communiste, le futur colonel Rol-Tanguy, né en 1908, se passionne pour le métier des armes lors de son service militaire. Son expérience dans les Brigades internationales est décisive. Il l’enrichit dans les FTP puis comme chef régional FFI : il prépare et conduit l’insurrection parisienne avec un état-major comportant de nombreux cadres de l’armée. Compagnon de la Libération, il se distingue dans la campagne d’Allemagne et est intégré dans l’armée avec ...

HISTORICAL SOURCES FOR THE ROL-PLAYING GAMES: AN EXPERIMENT ON THE DIDACTICAL TEACHING OF THE ANCIENT HISTORY FUENTES HISTÓRICAS DE LOS JUEGOS DE ROL: UN EXPERIMENTO PARA LA DIDÁCTICA DE LA HISTORIA ANTIGUA

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Juan Ramón Carbó García

2010-11-01

Full Text Available On this paper we intend to emphasize the importance of the historical sources for the conception and ambient of different rol-playing games; therefore, the usefulness of these for the didactical teaching of History too. Likewise, we collect the results of a didactic experiment on university level developed with a rol-playing game set in the Ancient Age and more precisely in the times of the Roman Empire.En este estudio pretendemos resaltar la importancia de las fuentes históricas para la concepción y ambientación de los distintos juegos de rol y por consiguiente, también la utilidad de éstos para la didáctica de la Historia. Asimismo, planteamos los resultados de un experimento didáctico en el nivel universitario desarrollado con un juego de rol ambientado en la Edad Antigua y más precisamente en época del Imperio Romano.

Rol docente universitario y competencias profesionales en la Licenciatura en Psicología

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Deisy Krzemien

Full Text Available Esta investigación propone explorar y describir la definición y expectativa del rol docente universitario en alumnos de la Licenciatura en Psicología de la Universidad Nacional de Mar del Plata. Poco se conoce sobre la expectación acerca del rol docente que los alumnos construyen en sus experiencias educativas. A partir de la literatura científica y los datos recabados, se propone un modelo de competencias profesionales del profesor universitario, considerando cuatro aspectos: teórico-académico, técnico-pedagógico, actitudinal y ético-social. En una etapa de investigación exploratoria, se realizaron entrevistas focalizadas a informantes clave. En una etapa descriptiva, se administró un cuestionario para evaluar la expectativa del rol docente en una muestra de 200 estudiantes. Se realizó un análisis comparativo, cuali y cuantitativo de datos. Los resultados evidencian la necesidad de una redefinición del rol docente en el marco de la nueva agenda didáctica. La calidad de la docencia universitaria enfrenta la necesidad de profesionalizar e institucionalizar la formación pedagógica del profesorado de educación superior.

[EVOLUTION OF REVISTA ROL DE ENFERMERÍA (1978-2008): A BIBLIOGRAPHIC ANALYSIS].

Science.gov (United States)

Duerto Alvarez, Clara; Miqueo, Consuelo

2015-10-01

Revista ROL de Enfermería was the first journal of nurses and adressed to nursing published with the birth of Spanish democracy, indexed soon Medline/PubMed. This paper analyzes the changes in the structure and function of the magazine. Highlights two facts. The journal ROL expresses the transformation of the new universitary nursing, and how was adapting to scientific standards: although not increased the number of original articles, was normalizing their structure, bibliography or citations pattern, and also the scientific writing style.

Estrés de rol y satisfacción laboral: examinando el papel mediador del engagement en el trabajo

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Alejandro Orgambídez-Ramos

2015-01-01

Full Text Available El objetivo de este estudio es examinar las relaciones entre estrés de rol, engagement y satisfacción laboral de acuerdo con el modelo demandas-recursos laborales. El modelo propuesto plantea que el engagement media la relación entre ambigüedad, conflicto y sobrecarga de rol, por un lado y satisfacción en el trabajo, por el otro. Para verificar el modelo, se obtuvieron datos de una muestra de 586 trabajadores del sur de Espana ( ˜ Medad = 37.11, 50% mujeres. El ajuste del modelo y de la mediación se realizaron mediante un modelo de ecuaciones estructurales (path analysis. Los resultados mostraron que el conflicto de rol y la ambigüedad de rol junto con el engagement fueron predictores significativos de la satisfacción laboral. No obstante, el engagement no medió la relación entre el estrés de rol y la satisfacción laboral. El estrés de rol como demanda obstaculizadora explicaría el mayor impacto directo sobre la satisfacción que a través del engagement. Se proponen implicaciones prácticas y futuras investigaciones.

Percepción del rol profesional de alumnos de enfermeria de la Universidad de Concepción, Chile Professional role perception in undergraduate nursing students from University of Concepcion, Chile

Directory of Open Access Journals (Sweden)

Patricia Jara Concha

2005-09-01

Full Text Available Estudio descriptivo exploratorio cuyo objetivo es describir la percepción de rol profesional que tienen los alumnos de enfermería de la Universidad de Concepción, Chile, en los diferentes niveles de formación, durante el año 2000. La muestra fue intencionada, 250 estudiantes agrupados en fracciones: A del primer año, B del tercer año y C del quinto año. Se aplicó un cuestionario elaborado por las autoras, basado en estudios previos de rol entre profesionales. La información se analiza descriptivamente para cada fracción por separado y luego se hace un análisis comparativo de las fracciones. Se utilizó análisis estadístico con Chi2 para las fracciones B y C. En relación con la imagen de rol, la mayoría percibe a la enfermera como coordinadora del trabajo en equipo y sólo un 18% como dadora del cuidado. En cuanto a la representación del concepto de rol planteado en situaciones de ejercicio profesional, mayoritariamente se identifican con el rol como cuidadora. En ambas, el análisis estadístico con Chi2 resultó no significativo. En los niveles B y C, se señala preferentemente el carácter expresivo del rol, encontrándose diferencias estadísticamente significativas. Se concluye que la percepción de rol que tienen los alum¬nos varía según el nivel de formación, y priman algunos factores educativos claves como los modelos de profesores y modelos enfermeras(os en campos clínicos.The aim of this descriptive exploratory research is to describe the professional role perception the undergraduate nursing students attending University of Concepción (CHILE have, in their different instructional levels, during academic year, 2000. An intentional sample, 250 students were chosen and grouped as follow; being A: First year, B: Third year, C: Fifth year. A questionnaire made up by the authors, based on previous role trials among professionals, was applied. The information was descriptively analyzed for each group (separately and a

Onze excuses : Over de rol van verontschuldigingen in crisiscommunicatie

NARCIS (Netherlands)

Janssen, D.M.L.|info:eu-repo/dai/nl/074078925; Gerards, Valenard

2016-01-01

In dit artikel onderzoeken we de rol van excuses in crisiscommunicatie. In een 2x2-experiment zijn we nagegaan of excuses effect hebben op crisisverantwoordelijkheid, reputatie, en woede en gedragsintenties van stakeholders in een opzettelijke en een niet-opzettelijke crisis. Crisistype bleek een

Asp30 of Aspergillus oryzae cutinase CutL1 is involved in the ionic interaction with fungal hydrophobin RolA.

Science.gov (United States)

Terauchi, Yuki; Kim, Yoon-Kyung; Tanaka, Takumi; Nanatani, Kei; Takahashi, Toru; Abe, Keietsu

2017-07-01

Aspergillus oryzae hydrophobin RolA adheres to the biodegradable polyester polybutylene succinate-co-adipate (PBSA) and promotes PBSA degradation by interacting with A. oryzae polyesterase CutL1 and recruiting it to the PBSA surface. In our previous studies, we found that positively charged amino acid residues (H32, K34) of RolA and negatively charged residues (E31, D142, D171) of CutL1 are important for the cooperative ionic interaction between RolA and CutL1, but some other charged residues in the triple mutant CutL1-E31S/D142S/D171S are also involved. In the present study, on the basis of the 3D-structure of CutL1, we hypothesized that D30 is also involved in the CutL1-RolA interaction. We substituted D30 with serine and performed kinetic analysis of the interaction between wild-type RolA and the single mutant CutL1-D30S or quadruple mutant CutL1-D30S/E31S/D142S/D171S by using quartz crystal microbalance. Our results indicate that D30 is a novel residue involved in the ionic interaction between RolA and CutL1.

Congruencia de rol de género y liderazgo: el papel de las atribuciones causales sobre el éxito y el fracaso

OpenAIRE

Rocio García-Retamero; Esther López-Zafra

2006-01-01

Analizamos el grado en que el prejuicio hacia una candidata a un puesto de liderazgo se debe a la percepción de incongruencia entre el rol de líder y su rol de género. Asimismo, evaluamos la influencia de dicha percepción en las atribuciones causales que se emiten sobre sus éxitos y fracasos. Concretamente, 523 participantes evaluaron un candidato (hombre o mujer) a un cargo que implicaba ejercer el rol de líder en una empresa congruente o incongruente con su rol de género, o n...

Controlling: controllersopleiding en rol en positie van de (register) controller

NARCIS (Netherlands)

Meer-Kooistra, J. van der; Vosselman, E.G.J.

2014-01-01

Het themanummer Controlling richt zich op het overkoepelende vakgebied Controlling en meer in het bijzonder op de postinitiële Controllersopleiding oftewel Executive Master of Finance and Control, de opleiding waarin dit vakgebied centraal staat, en op de rol en positie van de afgestudeerden van

Ruimtelike beplanning: die rol van die stads - en streeksbeplanner ...

African Journals Online (AJOL)

Ruimtelike beplanning: die rol van die stads - en streeksbeplanner in die saw. R Erasmus. Abstract. Since 1978 regional and town planners are employed in the SADF on a permanent basis as well as in the capacity of national service men. These men are all academically qualified and as such satisfy a need that developed ...

Los actores de la violencia escolar y el rol que desempeñan

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Laura Oliva Zárate

2014-01-01

Full Text Available La violencia es un fenómeno antiguo que se viene acrecentando y manifestando en distintos ámbitos sociales y afecta la vida de muchos niños y adolescentes. En México, se ha estudiado el tema en los centros de educación para iniciar acciones paliativas. En el presente estudio se elaboró y aplicó un software interactivo que aborda la violencia en estudiantes de secundaria y que permite, entre otros factores, identificar por sí mismo el rol que ocupa el adolescente respecto a la violencia: espectador, agresor o víctima. Participaron 25 alumnos de una secundaria oficial y el análisis cualitativo de los resultados se realizó mediante Atlas Ti; se revela el desconocimiento que los actores tienen con respecto al rol que despliegan ante la violencia dentro de la escuela, ya sea de quien la ejerce, de quien la recibe u observa. Los resultados arrojan un predominio del rol de espectador, con cifras de 52%, 32% como agresores, y 16% como víctimas. El software demuestra ser efectivo como una herramienta para el acercamiento del fenómeno de la violencia en adolescentes.

ROLE PLAYING GAMES IN THE CLASSROOM LOS JUEGOS DE ROL EN EL AULA

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Mario Grande de Prado

2010-11-01

Full Text Available Research done on the field of role playing games and their influence on young people's minds produces possitive results, that is to say, they (such games are not dangerous. At the same time, the few articles about role playing games and education show some possitive references about their educational effects. However, role playing games, considered as games, seem not to be relevant as some kind of strategy at Secondary Education nowadays. This article sums up the existing contributions and gives some proposals about their possible implementation.Las investigaciones realizadas en el ámbito de los juegos de rol y su influencia sobre las mentes de los jóvenes arrojan resultados positivos, es decir, no son peligrosos. Al mismo tiempo, los escasos artículos sobre juegos de rol y educación muestran referencias positivas sobre sus efectos educativos. Sin embargo los juegos de rol como tales no parecen ser relevantes actualmente como estrategia en Educación Secundaria. El presente artículo hace un repaso de las aportaciones existentes y realiza algunas propuestas sobre su posible aplicación.

Je brein de baas : Over de rol van bewust denken

NARCIS (Netherlands)

Aleman, (Andreas)

2017-01-01

In Je brein de baas neemt neuropsycholoog André Aleman het op voor het bewuste denken. Onderzoek heeft eerder aangetoond dat juist onbewuste processen in ons brein een grote invloed kunnen hebben op ons gedrag. Daardoor zijn veel wetenschappers de rol van bewust denken gaan bagatelliseren: het heeft

De rol van sociale media bij rampen en (mini)crises

NARCIS (Netherlands)

Jan Eberg; Menno van Duin; Vina Wijkhuijs

2016-01-01

Full text beschikbaar met HU-account. Sinds de opkomst van sociale media spelen de toepassing en het bereik ervan in toenemende mate een rol, ook bij rampen en crises. De vraag rijst dan hoe daar in de crisiscommunicatie en het crisismanagement effectief mee om te gaan. Uit literatuuronderzoek en

Van doorvoerland naar servicenetwerk; welke rol is voor Agrologistiek Nederland weggegelegd?

NARCIS (Netherlands)

Scheer, F.P.; Groot, J.J.; Snels, J.C.M.A.; Vorst, van der J.G.A.J.

2010-01-01

Het Nederlandse agro-cluster is een belangrijke peiler onder de Nederlandse economie. Haar netto export (export-import) bedraagt ruim 20 miljard euro en vertegenwoordigt circa 50% van de Nederlandse handelsbalans. Hierbinnen vervult de agrologistiek een belangrijke rol, zowel nationaal (toegevoegde

The effect of silicon on iron plaque formation and arsenic accumulation in rice genotypes with different radial oxygen loss (ROL).

Science.gov (United States)

Wu, Chuan; Zou, Qi; Xue, Sheng-Guo; Pan, Wei-Song; Huang, Liu; Hartley, William; Mo, Jing-Yu; Wong, Ming-Hung

2016-05-01

Rice is one of the major pathways of arsenic (As) exposure in human food chain, threatening over half of the global population. Greenhouse pot experiments were conducted to examine the effects of Si application on iron (Fe) plaque formation, As uptake and rice grain As speciation in indica and hybrid rice genotypes with different radial oxygen loss (ROL) ability. The results demonstrated that Si significantly increased root and grain biomass. Indica genotypes with higher ROL induced greater Fe plaque formation, compared to hybrid genotypes and sequestered more As in Fe plaque. Silicon applications significantly increased Fe concentrations in iron plaque of different genotypes, but it decreased As concentrations in the roots, straws and husks by 28-35%, 15-35% and 32-57% respectively. In addition, it significantly reduced DMA accumulation in rice grains but not inorganic As accumulation. Rice of indica genotypes with higher ROL accumulated lower concentrations of inorganic As in grains than hybrid genotypes with lower ROL. Copyright © 2016 Elsevier Ltd. All rights reserved.

Procedimientos interpretativos y reglas normativas en la negación del "status" y "rol"

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AARON V. CICOUREL

1982-01-01

Full Text Available Se compara la teoria de las "condiciones mínimas para la comunicación" con el modelo dominante de normas sociales y de comportamiento para explicar la negociación social del estatus y el rol como aparecen representados en el modelo de investigación de actor y observador. Se critican las teorías existentes por utilizar la noción de "asunción de rol" sin explicar el reconocimiento del rol y el estatus por parte del actor; y por fallar al explicar el proceso por el que se perciben las normas. Los procedimientos interpretativos basados en la negociación de un consenso se usan para explicar el aprendizaje, uso y evolución de las normas. Se explican las condiciones para la comunicación siguiendo las nociones de Alfred Schutz de "uso de la lógica" y "lógica reconstruida": reciprocidad de la perspectiva, habilidad del investigador para extrapolar más allá del sentido literal de las palabras, las normas de comunicación. El fundamento epistemológico de la investigación sociológica consiste en la estabilidad de los procedimientos negociadores e interpretativos usados en culturas con distintas estructuras normativas.

Las solteras y el incumplimiento del rol matrimonial

OpenAIRE

Vallejo P., Elvira

2001-01-01

El tema sobre las mujeres solteras y el incumplimiento del rol matrimonial se aborda por el interés personal de trabajar con mujeres y sobre todo con mujeres solas, en búsqueda de una respuesta a esta interrogante ¿Dónde aprendimos que la maternidad dentro del matrimonio es el único destino de la mujer? ¿En qué momento perdimos nuestra identidad para someternos a la cultura u convertirnos en seres humanos dependientes de los hombres? . El análisis viene hecho desde varios escenarios que r...

Inversion for Eigenvalues and Modes Using Sierra-SD and ROL.

Energy Technology Data Exchange (ETDEWEB)

Walsh, Timothy [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Aquino, Wilkins [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Ridzal, Denis [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Kouri, Drew Philip [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

2015-12-01

In this report we formulate eigenvalue-based methods for model calibration using a PDE-constrained optimization framework. We derive the abstract optimization operators from first principles and implement these methods using Sierra-SD and the Rapid Optimization Library (ROL). To demon- strate this approach, we use experimental measurements and an inverse solution to compute the joint and elastic foam properties of a low-fidelity unit (LFU) model.

FUENTES HISTÓRICAS DE LOS JUEGOS DE ROL: UN EXPERIMENTO PARA LA DIDÁCTICA DE LA HISTORIA ANTIGUA

Directory of Open Access Journals (Sweden)

Juan Ramón Carbó García

2010-11-01

Full Text Available En este estudio pretendemos resaltar la importancia de las fuentes históricas para la concepción y ambientación de los distintos juegos de rol y por consiguiente, también la utilidad de éstos para la didáctica de la Historia. Asimismo, planteamos los resultados de un experimento didáctico en el nivel universitario desarrollado con un juego de rol ambientado en la Edad Antigua y más precisamente en época del Imperio Romano.

Viscoelastic material inversion using Sierra-SD and ROL

Energy Technology Data Exchange (ETDEWEB)

Walsh, Timothy [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Aquino, Wilkins [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Ridzal, Denis [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Kouri, Drew Philip [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); van Bloemen Waanders, Bart Gustaaf [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Urbina, Angel [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

2014-11-01

In this report we derive frequency-domain methods for inverse characterization of the constitutive parameters of viscoelastic materials. The inverse problem is cast in a PDE-constrained optimization framework with efficient computation of gradients and Hessian vector products through matrix free operations. The abstract optimization operators for first and second derivatives are derived from first principles. Various methods from the Rapid Optimization Library (ROL) are tested on the viscoelastic inversion problem. The methods described herein are applied to compute the viscoelastic bulk and shear moduli of a foam block model, which was recently used in experimental testing for viscoelastic property characterization.

El rol del docente en la evaluación cualitativa de los aprendizajes del inglés

OpenAIRE

Alcedo, Yesser; Chacón, Carmen Teresa

2011-01-01

La evaluación de los aprendizajes ha retomado su importancia y trascendencia, en las últimas décadas en el Sistema Educativo Venezolano, debido a las reformas y políticas educativas, de allí que el rol que el docente de Inglés asume ante el mencionado proceso, es un tema impostergable para su estudio y valoración, dada la poca información que parecieran tener los docentes en relación con el rol de evaluador y la evaluación cualitativa de los aprendizajes del Inglés. El objetivo d...

Die rol van kapitaal in die ekonomiese groei en ontwikkeling van onderontwikkelde gebiede*

Directory of Open Access Journals (Sweden)

F. J. du Plessis

1961-03-01

Full Text Available In die teorie oor ekonomiese groei speel kapitaal ’n besonder prominente rol. Kapitaal met die daarby behorende tegnologiese ontwikkeling, word beskou as die belangrikste enkele faktor verantwoordelik vir die bereiking en instandhouding van ’n „ten voile ontwikkelde” volkshuishouding.

Estudio del rol paterno en la familia e implicancia en el desarrollo de los hijos desde el personalismo

OpenAIRE

Paz Saldarriaga, Edgard Abraham

2016-01-01

En la actualidad la familia es atacada por ideologías muy poderosas, que van originando un debilitamiento en su estructura interna, generando una crisis en el rol e imagen paterna, por falta de conocimiento de su realidad y su influjo en los hijos. Por tal motivo, en el presente trabajo de investigación se pretendió analizar y comprender el rol paterno al interior de la familia y su implicancia en el desarrollo de los hijos desde una visión personalista. Esta investigación es de tipo teórico ...

Rol de la enfermera en la actualidad deportiva del escolar

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Medina de Forero Nubia

1992-12-01

Full Text Available

En este trabajo se presenta una propuesta del rol de la enfermera escolar, ya que como integrante de equipos multidisciplinarios, debe desempeñar un papel importante en la planeación, desarrollo y seguimiento de programas de adecuación física, dirigidos a escolares y adolescentes. Se presenta un formato de valoración basado en patrones funcionales, el cual permite detectar riesgos relacionados con la práctica del ejercicio.

CAMBIO DE ACTITUDES Y VALORES ANTE LA ENERGÍA TRAS EL USO DE UN JUEGO DE ROL

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Jorge Hernández Carbonell

2010-11-01

Full Text Available Los juegos de rol en educación se han definido como dramatizaciones que se vertebran en torno a una situación concreta y utilizan la asignación de papeles a alumnos, quienes deberán defender con argumentos una opinión (previamente perfilada frente a un problema. Cada vez más utilizados en la educación formal y no formal, destacan entre sus ventajas el convertir lo lúdico en aprendizaje, potenciar el aprendizaje de actitudes y valores y la conexión que se realiza con la vida real entre otros. La utilización de un juego de rol en una investigación educativa sobre cambio de actitudes y valores ante los recursos energéticos cuyos resultados educativos fueron positivos, permitió repetir dicha investigación usando la variable “utilización/no utilización del juego de rol”, lo que concedió la posibilidad de analizar la importancia de los juegos de rol en la potenciación de cambios en las actitudes y valores de los usuarios de estos juegos.

From continuum analytical description to discrete numerical modelling of localized fluidization in granular media

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Puig i Montellà Eduard

2017-01-01

Full Text Available We present analytical and numerical results on localized fluidization within a granular layer subjected to a local injection of fluid. As the injection rate increases the three different regimes previously reported in the literature are recovered: homogeneous expansion of the bed, fluidized cavity in which fluidization starts developing above the injection area, and finally the chimney of fluidized grains when the fluidization zone reaches the free surface. The analytical approach is at the continuum scale, based on Darcy’s law and Therzaghi’s effective stress principle. It provides a good description of the phenomenon as long as the porosity of the granular assembly remains relatively homogeneous. The numerical approach is at the particle scale based on the coupled DEM-PFV method. It tackles the more heterogeneous situations which occur at larger injection rates. A direct link is evidenced between the occurrence of the different regimes of fluidization and the injection aperture. Finally, the merging of chimneys in case of two injection points is investigated.

Groenbemesters en aaltjesmanagement; De belangrijke rol van deze groene motor in de grond

NARCIS (Netherlands)

Korthals, G.W.; Sukkel, W.

2008-01-01

Groenbemesters spelen een essentiële rol in de (biologische) rotatie, ook al heeft het gebruik ervan zowel voor- als nadelen. Bij een doordachte keus uit het aanbod aan groenbemesters wegen de voordelen op tegen de nadelen. Een groenbemester wordt steeds vaker gezien als de 'groene' motor voor

Enteroparasites prevalence among daycare and elementary school children of municipal schools, Rolândia, PR, Brazil Prevalência de enteroparasitoses em crianças de creches e alunos da rede municipal de ensino de Rolândia, Paraná

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Nilson Giraldi

2001-01-01

Full Text Available Coproparasitological analyses were performed on 191 daycare children and 434 elementary school children from urban and rural areas in Rolândia, Parana State, Brazil. The overall prevalence of enteroparasites was 15.2 % for daycare children and 52.5% for elementary school children. Risk factors are discussed.Exames coproparasitológicos realizados em 191 crianças de creches e em 434 alunos da primeira à quarta série das áreas urbana e rural da rede municipal de Rolândia, PR, evidenciaram enteroparasitas em prevalência de 15,2% nas creches e de 52,5% entre os escolares. Fatores de risco são discutidos.

El rol de las emociones en la esfera pública

OpenAIRE

Baum, Erica

2012-01-01

ResumenComo seres humanos nos encontramos condicionados por nuestras emociones, solemos reaccionar ante distintas situaciones conflictivas con enojo, alegría o tristeza, entre otras. Un simple recuerdo puede: enturbiar nuestro momento actual con dolor o nostalgia o generarnos gratitud y felicidad. Las emociones, al dar cuenta de la vulnerabilidad que nos es inherente, desempeñan un rol significativo en la vida individual pero también en la moralidad social. Mi pregunta es: ¿deberían ser tenid...

Etiquetatge automàtic de rols semàntics amb un sistema d'aprenentatge basat en memòria

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Roser Morante

2008-05-01

Full Text Available En aquest article presentem un sistema d'etiquetatge automàtic de rols semàntics, el principal component del qual és un classificador basat en memòria. El sistema s'estat entrenat amb el corpus Cast3LB-CoNLL-SemRol. Els atributs codifiquen informació de sintaxi de dependències. Els resultats obtinguts (F1 0,86 són comparables amb els dels sistemes existents (F1 entorn de 0,86, que utilitzen informació de sintaxi de constituents. Text complet (PDF

Die hoogs-onversadigde vetsure: fisiologiese rol en kliniese moontlikhede

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M. Haag

2006-09-01

Full Text Available Vetsure speel ’n uiters belangrike rol in die fisiologie van die mens. Afgesien daarvan dat vetsure in gestoorde trigliseriede gebruik word vir energieverskaffing, word vetsure vanaf dieetlipiede in plasma vervoer en ingebou in verskeie sellulêre strukture. Die vetsuurprofiel van selmembraanfosfolipiede is bepalend by die funksie van die selmembraan daarin dat dit vloeibaarheid, reseptorfunksie en ook die tipe eikosanoïede wat daaruit gesintetiseer kan word, beïnvloed. Vetsure lewer verder ook hoogs gedifferensieerde insette in sellulêre seintransduksieprosesse en regulering van geentranskripsie. Die steriese konformasie van vetsure speel ’n groot rol hierin: die reguitketting versadigde en trans-vetsure, in vergelyking met die onversadigde vetsure met progressief meer geboë kettings, lei tot ’n verskeidenheid meganismes wat minder positiewe effekte vir ons gesondheid inhou. Die twee belangrikste families van die poli-onversadigde vetsure, naamlik die omega-3 en omega-6 vetsuurgroepe, lei ook tot verskillende effekte in dié verband. Veranderings in die patroon van dieetvetsuurinname deur die eeue het gelei tot ’n verhoogde inname van versadigde, trans- en omega-6 vetsure, relatief tot omega-3 vetsure. Kliniese proewe het in die afgelope twintig jaar bewys dat dieetaanvulling met omega-3 vetsure tot verbetering in die simptome van ’n hele aantal toestande wat as leefstylgebonde beskou word, kan lei. Aterosklerose, vetsug, diabetes mellitus tipe 2, depressie, skisofrenie, Alzheimer-siekte, aandagtekorthiperaktiwiteitsversteuring in jong kinders, sekere tipes kanker, osteoporose in bejaardes en sekere dermatologiese siektes tel onder die versteurings wat op dié manier aangespreek kan word.

Original Paper Performances comparées du HDL-cholestérol et du ...

African Journals Online (AJOL)

CT/HDL-C) et du HDL-Cholestérol est le meilleur prédicteur du SMet chez les adultes béninois. .... (Canada) et du. Ministère de la Santé du Bénin. Le consentement éclairé écrit a été obtenu de chaque participant avant leur recrutement dans.

Roll of the adjuvant radiotherapy. Kidney cancer. Stage III. Results to 5 years. Observational, descriptive, retrospective, quantitative and comparative study with data numerical description; Rol de la radioterapia adyuvante. Cancer de rinion. Estadio III. Resultados a 5 anios. Estudio observacional, descriptivo, retrospectivo, cuantitativo y comparativo, con descripcion numerica de los datos

Energy Technology Data Exchange (ETDEWEB)

Lione, M; Tissera, N; Mandachain, M [Centro de Oncologia y Terapia Radiante, Santa Rosa, La Pampa (Argentina)

2007-07-01

Kidney cancer represents 3 % of the tumors in adults. In the United States, the 45% is diagnosed in early stages. Its natural history is characterized for being absolutely unpredictable and probably related to hormonal, immunologic and unknown factors. There are patients in advanced stage with prolonged or low average survival and even with metastasis declination. These particularities along with the lack of prospective random studies make difficult to establish which is the roll of the adjuvant radiotherapy, being considered not standard since 1997. [Spanish] El cancer de rinion representa el 3% de los tumores en adultos. En Estados Unidos el 45% se diagnostica en estadios tempranos. Su historia natural se caracteriza por ser absolutamente impredecible, probablemente relacionado a factores hormonales, inmunologicos y desconocidos; hay pacientes con enfermedad avanzada con prolongada o corta supervivencia media e incluso con regresion de metastasis. Estas particularidades, juntamente con la falta de estudios prospectivos aleatorios dificultan establecer cual es el rol de la radioterapia adyuvante, considerandose no estandar desde 1997.

Regional hydrogeological simulations for Forsmark - numerical modelling using CONNECTFLOW. Preliminary site description Forsmark area - version 1.2

Energy Technology Data Exchange (ETDEWEB)

Hartley, Lee; Cox, Ian; Hunter, Fiona; Jackson, Peter; Joyce, Steve; Swift, Ben [Serco Assurance, Risley (United Kingdom); Gylling, Bjoern; Marsic, Niko [Kemakta Konsult AB, Stockholm (Sweden)

2005-05-01

The Swedish Nuclear Fuel and Waste Management Company (SKB) carries out site investigations in two different candidate areas in Sweden with the objective of describing the in-situ conditions for a bedrock repository for spent nuclear fuel. The site characterisation work is divided into two phases, an initial site investigation phase (IPLU) and a complete site investigation phase (KPLU). The results of IPLU are used as a basis for deciding on a subsequent KPLU phase. On the basis of the KPLU investigations a decision is made as to whether detailed characterisation will be performed (including sinking of a shaft). An integrated component in the site characterisation work is the development of site descriptive models. These comprise basic models in three dimensions with an accompanying text description. Central in the modelling work is the geological model, which provides the geometrical context in terms of a model of deformation zones and the rock mass between the zones. Using the geological and geometrical description models as a basis, descriptive models for other geo-disciplines (hydrogeology, hydro-geochemistry, rock mechanics, thermal properties and transport properties) will be developed. Great care is taken to arrive at a general consistency in the description of the various models and assessment of uncertainty and possible needs of alternative models. Here, a numerical model is developed on a regional-scale (hundreds of square kilometres) to understand the zone of influence for groundwater flow that affects the Forsmark area. Transport calculations are then performed by particle tracking from a local-scale release area (a few square kilometres) to identify potential discharge areas for the site and using greater grid resolution. The main objective of this study is to support the development of a preliminary Site Description of the Forsmark area on a regional-scale based on the available data of 30 June 2004 and the previous Site Description. A more specific

Rol gerencial en las juntas parroquiales rurales del Ecuador en la implementación de políticas públicas

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Baly Ilovasky Vera Montenegro

2017-07-01

Full Text Available Este artículo tiene como objetivo determinar el rol gerencial de las autoridades seccionales en las juntas parroquiales rurales, relacionada con la implementación de políticas públicas, para lo cual se explora diversos conceptos sobre organización, su tipología, la gerencia, la interrelación de la gerencia en la implementación de política pública, también se analiza la toma de decisiones.   Palabras clave: implementacion, políticas públicas, rol, organizacion.

Rol de género y funcionamiento familiar

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Patricia Herrera Santi

2000-12-01

Full Text Available En este trabajo se realiza un breve bosquejo del surgimiento y significación del rol de género y se relaciona con algunos de los indicadores de funcionamiento familiar, analizando en qué medida puede afectar la expresión favorable del mismo, alterar la dinámica interna de las relaciones familiares y actuar como factor patógeno en la salud familiarA brief sketch of the appearance and significance of the gender role is made in this paper. It is also related to some indicators of family functioning and it is analyzed to what extent this relationship may affect its favorable expression, alter the internal dynamics of the family relations and act as a pathogenic factor in family health

Experiment list: SRX142530 [Chip-atlas[Archive

Lifescience Database Archive (English)

Full Text Available rol=Control_50bp || control description=This data represents a control being compared to experiments using r...rol description=This data represents a control being compared to experiments using read length of 50 bp || c

Videojuego de rol táctico de estética retro basado en combates por turnos

OpenAIRE

García García, Juan de la Cruz

2010-01-01

Videojuego de rol basado en combates por turnos con estética retro, de nombre comercial TierraCuadrada, donde el jugador podrá llevar a cabo partidas en modo historia, involucrando combates con la Inteligencia Artificial, y partidas contra rivales humanos.

El rol del professor en l’aprenentatge col·laboratiu mediat per ordinador

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Ingrid Noguera-Fructuoso

2009-10-01

Full Text Available En aquest article es presenten els resultats d'una investigació sobre el canvi de rol que es produeix en el professorat en l'ús de les TIC com a eina per a l'aprenentatge col·laboratiu en educació primària i secundària. L'interès es focalitza en l'ús concret d'una eina dissenyada per a l'aprenentatge col·laboratiu, el BSCL, sota el model pedagògic de qüestionament progressiu. En primer lloc, es duu a terme una revisió teòrica. En segon lloc, s'exposen les preguntes d'investigació, la justificació d'aquesta, es descriu el disseny i l'enfocament metodològic escollit, l'estudi de casos. Els resultats obtinguts revelen que hi ha una tendència cap al canvi de rol en el professorat en l'ús del BSCL com a eina per a l'aprenentatge col·laboratiu així com l'eficàcia del model de qüestionament progressiu en la construcció de coneixement de l'alumnat.

EL ROL DEL PADRE EN LAS FAMILIAS CON MADRES QUE TRABAJAN FUERA DEL HOGAR

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Inmaculada Fernández Soto

2000-01-01

Full Text Available Este trabajo es el resultado de una investigación que busca describir el rol del padre en familias con madres trabajadoras y con niños en edad preescolar. Se entiende «rol del padre» como la serie de conductas y cualidades expresadas y esperadas que definen la posición del padre. Para llevar a cabo este estudio se utilizó como estrategia metodológica el diseño descriptivo– comparativo. La recolección de la información se realizó mediante la técnica de entrevista semiestructurada. La muestra de estudio estuvo conformada por 100 familias pertenecientes al estrato socioeconómico medio del distrito de Barranquilla, en las que ambos padres trabajan fuera del hogar y cuyos hijos se hallan en edad preescolar. Los resultados muestran cómo frente a los grandes cambios que afronta la familia frente a las crisis sociales, en su interior el papel del padre no ofrece grandes cambios, y mantiene aún las características propias de las sociedades tradicionales.

Opinión sobre el rol y perfil del educador para la primera infancia

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Beatriz Elena Zapata

2010-10-01

Full Text Available En este artículo presentamos los resultados consolidados de la investigación desarrollada entre Chile y Colombia “Opinión que se tiene sobre el rol del profesional de la educación para la primera infancia en dos países latinoamericanos”, una descripción levantada desde las opiniones aportadas por comunidades diversas (directivos docentes, docentes, apoderados de la educación, familias , estudiantes y profesionales de otras áreas; estudio de carácter cualitativo explicativo en el cual participan 10 universidades, miembros de la Omep (Organización Mundial de Educación Preescolar. El estudio tuvo como propósito la caracterización del rol y perfil del educador para la primera infancia, el cual se realiza desde el enfoque de competencias y en el marco de las Políticas Públicas que a nivel de Latinoamérica se han gestado en las últimas décadas en torno a la atención integral y educación de los niños y niñas.

MYTHS AND LEGENDS OF THE GAMES ROLE MITOS Y LEYENDAS SOBRE LOS JUEGOS DE ROL

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Rocío Tizón

2010-11-01

Full Text Available p { margin-bottom: 0.21cm; } Roleplaying Games were born in the 70´s in the United States, created by Gary Gigax and Dave Arneson, both parents of the now famous game Dungeons & Dragons. However, this game had few years of calm, because in its native country it was found guilty of promoting the suicide of several teenagers who were Dungeons & Dragons players. The lies of the information concerned and the prejudices of the news about these roleplaying games caused that some people became interested in the topic, analyzing those myths and checking the truth of these rumors. One of these scholars was William Watson, creator of the website called The Inquirer, which is dedicated to dismantle these and other prejudices about roleplaying games.Los juegos de rol aparecen en la década de los años 70 en Estados Unidos, creados por Gary Gigax y Dave Arneson, padres del ya famoso Dragones & Mazmorras. No obstante, fueron pocos los años de tranquilidad, ya que en su país natal se le consideró culpable de promover el suicidio de varios adolescentes que habían sido jugadores de Dragones & Mazmorras. Los engaños de la información y los prejuicios de las noticias sobre estos juegos de rol provocaron que varias personas se interesaran por este fenómeno, analizando dichos mitos y comprobando la verdad de estos rumores. Uno de estos estudiosos fue William Watson, creador de la página web The Inquirer, en la que se dedica a desmontar estos y otros tópicos sobre juegos de rol.

ROL DEL DOCENTE EN LA GESTIÓN UNIVERSITARIA CONTEMPORÁNEA

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Yogledis Irma Navarrete Valero

2013-11-01

Full Text Available El docente de hoy tiene que estar convencido sobre el papel clave que le corresponde desempeñar en los tiempos actuales y sobre la importancia estratégica, para el futuro de su país, de la institución a la cual sirve. Deberá también estar familiarizado con el nuevo paradigma educativo. Su rol ya no es el del catedrático que simplemente dicta o imparte clases magistrales y luego califica los exámenes de sus alumnos. No es tampoco el del profesor que enseña y luego evalúa si sus alumnos son capaces de repetir lo que les ha enseñado, o de comprobar si asimilaron el conocimiento por él transmitido. Si hoy día lo importante es, como vimos antes, el aprendizaje, o mejor dicho los aprendizajes que los estudiantes realmente incorporan a su experiencia vital, de suerte que aprendan a aprender para que nunca dejen de seguir aprendiendo. Por tanto, los docentes universitarios como responsables de la formación de los estudiantes, deben asumir el rol de orientadores propiciando la autorrealización personal, profesional y laboral con estrategias y nuevas tecnologías de comunicación.PALABRAS CLAVE: gestión universitaria; rol docente; desarrollo profesionalROLE OF THE TEACHING STAFF IN THE CONTEMPORARY UNIVERSITY ADMINISTRATIONABSTRACTIt must be convinced on the key paper that it corresponds to him to carry out in the present times and on the strategic importance, for the future of its country, as the institution to which it serves. It will have to also be familiarized with the new educative paradigm. Its roll no longer is the one of the university professor who simply dictates or gives skillful classes and soon he describes the examinations as his students. He is not either the one of the professor who teaches and soon he evaluates if their students are able to repeat what he has taught to them, or to verify if they assimilated the knowledge by transmitted him. If nowadays the important thing is, as we saw before, the learning or rather the

[The importance of a bibliographic analysis in the magazines published by Revista Rol de Enfermeria"].

Science.gov (United States)

Lorente Gallego, A M; Chaín-Navarro, C; Flores Martín, J A

2007-06-01

This article is a preview of a project whose objective is to carry out a bibliographical analysis of the articles bearing scientific information included in the "ROL de Enfermeria" magazine over the past five years. This magazine started publication in 1978 and has as its goal contributing to the spread of scientific knowledge in the Nursing field.

Computación evolutiva de bosques de expansión mínimos con restricción de grado y de rol

OpenAIRE

Antón Sánchez, Laura

2015-01-01

Encontrar el árbol de expansión mínimo con restricción de grado de un grafo (DCMST por sus siglas en inglés) es un problema NP-complejo ampliamente estudiado. Una de sus aplicaciones más importantes es el dise~no de redes. Aquí nosotros tratamos una nueva variante del problema DCMST, que consiste en encontrar el árbol de expansión mínimo no solo con restricciones de grado, sino también con restricciones de rol (DRCMST), es decir, a~nadimos restricciones para restringir el rol ...

El rol del docente y del estudiante en las clases de historia

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Zandra Herrera Jacobs

2013-09-01

Full Text Available El siglo XXI ha traído consigo la necesidad de formar un hombre acorde con este nuevo tiempo, un ciudadano del mundo, que forma parte de una civilización global pero que también está comprometido con su país, con su comunidad y es capaz de adaptarse al cambio constante. Para lograr este objetivo se hace necesario que los docentes faciliten el aprender a conocer, el aprender a hacer, el aprender a convivir y el aprender a ser, utilizando las oportunidades que brindan las nuevas tecnologías de la información y la comunicación. Se realizó un estudio preexperimental, preprueba-postprueba con un solo grupo, para determinar si la asistencia de una muestra de veinte estudiantes de la carrera Licenciatura en Educación Integral de la Universidad Nacional Abierta, que ejercen la docencia, a un taller de enseanza-aprendizaje de la Historia Moderna y Contemporánea de Venezuela a través del análisis psicosocial de obras literarias con apoyo de las TICs, influía en la percepción que tenían, según el género, acerca del rol del estudiante y el rol del docente en las clases de Historia. Los resultados indicaron cambios en la percepción acerca de estos roles pero no se evidenciaron diferencias significativas entre la percepción según el género de los estudiantes.

Rol del kinesiólogo en una unidad de piso pelviano

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Fuentes V. Kine. Bernardita

2013-03-01

Full Text Available Las disfunciones del piso pélvico (DPP deben ser evaluadas y tratadas en forma multidisciplinaria. El kinesiólogo especialista en piso pelviano es un profesional que tiene un rol bien definido en este equipo de salud. La rehabilitación es considerada como tratamiento de primera línea en el abordaje de un número significativo de DPP. Los inicios del entrenamiento muscular del piso pélvico datan de los años 50, sin embargo desde la década de los 80, el kinesiólogo no solo realiza ejercicios, sino que su enfoque es más amplio incluyendo una serie de técnicas kinésicas y que se denomina reeducación pelviperineal (RPP. Los resultados de los tratamientos de rehabilitación han sido demostrados en distintas disfunciones del piso pelviano, teniendo además un rol fundamental en la prevención. El desarrollo de esta especialidad es nueva en nuestro país, pero ha ido adquiriendo poco a poco más relevancia y credibilidad. El objetivo del siguiente artículo es exponer el enfoque y el aporte del kinesiólogo, no sólo en el tratamiento sino también en la prevención de disfunciones del piso pelviano. Además se desea dar a conocer la indicación y las etapas y método de la reeducación pelviperineal y por último, el desarrollo que ha tenido esta especialidad kinésica en nuestro país.

Rol del profesional de enfermería en la investigación clínica

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Sandra Juliana Zarate

2011-12-01

Full Text Available Introducción: El Rol de la enfermera en investigación clínica, se enfrenta a grandes avances científicos, por lo cual cobra cada vez mayor importancia la gestión que realiza en los procesos de selección, evaluación y seguimiento de los participantes en estudio, buscando mantener grandes estándares de calidad en la ejecución, hasta llegar a su culminación exitosa. Materiales y Métodos: Artículo de reflexión sobre un análisis crítico, que describe detalladamente el rol de la enfermera en investigación clínica. Resultados: Este articulo tiene como finalidad, demostrar el amplio campo de acción de las enfermeras en el área de investigación, de la cual se resalta la gran labor y el avance en la actualidad,es preciso remontarnos a la segunda mitad del siglo XIX, cuando se profesionaliza la enfermería y de ahí surge la necesidad de la primera enfermera que se preocupó por la investigación, Florence Nightingale, quien dedicó parte de su trabajo a la investigación de enfermería. Discusión y Conclusiones: Los profesionales de enfermería en investigación clínica, tiene la posibilidad de aplicar cuidados con autodeterminación,pues poseen bases científicas adquiridas en la academia que emplea en los diferentes estudios clínicos, por otra parte su desarrollo personal y las habilidades innatas son vitales a la hora de relacionarse con el equipo de trabajo y los participantes, lo anterior fundamenta la disciplina de la profesión en un alto grado de evidencia científica que se implementa en cuidados basados en la evidencia. (Rev Cuid 2011; 2(2: 246-49Palabras clave: Investigación Clínica, Rol de la Enfermera, Gestión en Salud. (Fuente: DeCS BIREME.

Genetic transformation of Begonia tuberhybrida by Ri rol genes.

Science.gov (United States)

Kiyokawa, S; Kikuchi, Y; Kamada, H; Harada, H

1996-04-01

We have developed an Agrobacterium -mediated transformation system for commercial Begonia species. The leaf explants of Begonia semperflorens, Begonia x hiemalis and B. tuberhybrida were inoculated with Agrobacterium tumefaciens LBA4404 harboring a binary vector pBI121 which contains rolA, B and C genes of an agropine type Ri plasmid (pRiA4b). Kanamycin resistant shoots of B. tuberhybrida were obtained on MS agar medium supplemented with 0.1 mg/l NAA, 0.5 mg/l BA, 500 mg/l claforan and 100 mg/l kanamycin. These shoots exhibited GUS activity and Southern analysis showed a single copy insertion into the genome. When the transgenic plants were transferred to soil, they displayed the phenotype specific to the transgenic plants by A. rhizogenes such as dwarfness, delay of flowering, and wrinkled leaves and petals.

Demandas obstaculizados en el trabajo: El efecto de estrés de rol en la relación entre engagement y satisfacción laboral

OpenAIRE

Orgambídez-Ramos, Alejandro

2017-01-01

# Introducción Dentro de los riesgos psicosociales en el trabajo, se destacan especialmente los estresores de rol por su impacto en el burnout y en la satisfacción laboral (EU-OSHA, 2014). En concreto, se ha mostrado que el conflicto y la ambigüedad de rol son dos de los obstáculos más frecuentes de los trabajadores al enfrentarse a las nuevas exigencias en las empresas, muchas veces sin la información y los recursos necesario (Garrosa, et al., 2008). Además, desde el modelo Demandas-Recur...

Debates: sobre el rol de la escuela y de los educadores de adultos en las cárceles

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Francisco José Scarfó

Full Text Available RESUMEN: Cuando se realiza una caracterización mínima del ejercicio del rol docente en la educación pública en las cárceles, importa basarse en el rol profesional pedagógico emergente y en particular sobre la adaptabilidad y/o contextualidad de la educación en tanto derecho humano que constituye la clave para pensar a la formación y la selección de los/as educadores en una articulación de una serie de componentes fundamentales, destacando dos de éstos: las condiciones de su apropiación desde la perspectiva de quien aprende (en nuestro caso jóvenes o adultos privados de su libertad y las características de las situaciones específicas en que tendrá lugar la enseñanza, en función de los contextos concretos de actuación (o sea en la cárcel.

Biologia floral de Virola surinamensis (Rol. Warb. (Myristicaceae Virola surinamensis (Rol. Warb. (Myristicaceae floral biology

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Mario Augusto Gonçalves Jardim

2007-12-01

Full Text Available Neste artigo são apresentadas informações sobre a biologia floral de Virola surinamensis (Rol. Warb. (Myristicaceae, espécie florestal dióica de relevante importância econômica na região amazônica. O estudo foi realizado em uma área de várzea próximo à bacia do igarapé Murutucum, lado direito do rio Guamá, localizada no Campus da Faculdade de Ciências Agrárias do Pará, na cidade de Belém, Estado do Pará, no período de janeiro a dezembro de 2001. Avaliou-se a biologia floral desde o aparecimento dos botões florais até a senescência das flores estaminadas, bem como a formação de frutos nas flores pistiladas. Testes bioquímicos foram aplicados para verificação de odor, pigmentos, osmóforos e receptividade do estigma. A observação no comportamento dos visitantes florais foi realizada durante o período diurno, registrando-se os horários de visitas, tempo de permanência na flor e freqüência; alguns indivíduos foram coletados com rede entomológica e identificados no Departamento de Zoologia do Museu Paraense Emílio Goeldi. A antese ocorreu entre 6 e 16 h nas flores estaminadas e entre 8 e 16 h nas flores pistiladas; a presença de odor foi constatada apenas nas flores estaminadas, enquanto os pigmentos e osmóforos foram encontrados em ambas as flores; o estigma mostrou-se receptivo no período entre 12 e 14 h. Os insetos da ordem diptera foram os visitantes mais freqüentes nas flores estaminadas e pistiladas e as espécies Copestylum sp. e Erystalys sp., as responsáveis pela polinização.Information was obtained on the floral biology of Virola surinamensis (Rol. Warb. (Myristicaceae, a dioecious arboreal species of great importance for the Amazon region economy. The study was carried out in the floodplain area near the Murucutu stream, on the right side of the Guamá River, at the Universidade Federal Rural da Amazônia-UFRA, Belém-Pará , from January to December 2001. Floral biology was assessed from

Los actores de la violencia escolar y el rol que desempeñan

OpenAIRE

Laura Oliva Zárate; Miriam Magaly Calderón Vidal

2014-01-01

La violencia es un fenómeno antiguo que se viene acrecentando y manifestando en distintos ámbitos sociales y afecta la vida de muchos niños y adolescentes. En México, se ha estudiado el tema en los centros de educación para iniciar acciones paliativas. En el presente estudio se elaboró y aplicó un software interactivo que aborda la violencia en estudiantes de secundaria y que permite, entre otros factores, identificar por sí mismo el rol que ocupa el adolescente respecto a la violencia: espec...

PERSONALITY AND CHARACTER PREFERENCE IN ROLE-PLAYING GAMES PERSONALIDAD Y ELECCIÓN DE PERSONAJE EN LOS JUEGOS DE ROL: DIME QUIÉN ERES Y TE DIRÉ QUIÉN PREFIERES SER

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Pedro José Ramos-Villagrasa

2010-11-01

Full Text Available In role-playing games players perform participative and episodic stories. Personality is a psychological construct associated with decision processes in many aspects of life. In this study, we analyzed if Big Five Personality Factors were related to game character preferences in the role-playing game “Dungeons & Dragons”. Results show that Personality is related only in the decision of character’s class. We also study the relationship between Personality and plots in role-playing games (action, intrigue, mystery, and personal relationships. Finally, recommendations to further investigation were given.Los juegos de rol son una forma de ocio en la que un conjunto de jugadores participa en un sistema de creación de historias episódicas y participativas. La personalidad es un constructo que ha mostrado su influencia en la toma de decisiones de múltiples aspectos de la vida, y en este estudio comprobamos si se relaciona con la elección de personaje. Se contó con cincuenta y siete jugadores de rol que cumplimentaron un cuestionario acerca del juego de rol Dungeons & Dragons. Los resultados muestran diferencias en la elección de la clase de personaje según los factores de personalidad Apertura a la Experiencia, Amigabilidad y Extraversión. Junto a ello, se examinan las asociaciones existentes entre Personalidad y preferencia de determinados tipos de partidas de rol. Finalmente, se reivindica la realización de más investigaciones que contribuyan a conocer la relación entre Personalidad y elección de personaje en los juegos de rol.

Diagnostico de situacion del rol del bibliotecólogo en los medios de comunicacion de Montevideo

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Eliana Carvidón

2013-12-01

Full Text Available Este artículo sintetiza los fundamentos teóricos y metodológicos así como los resultados y conclusionesobtenidos en el proyecto de investigación denominado “El rol del bibliotecólogo en los medios de comunicación de Montevideo”, que fue elaborado para la obtención del título de Licenciado en Bibliotecología.

Germinação e armazenamento de sementes de Virola surinamensis (Rol. Warb. (Myristicaceae Germination and storage of seeds of Virola surinamensis (Rol. Warb. (Myristicaceae

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Juliana Domingues Limas

2007-02-01

Full Text Available Este trabalho teve como objetivo estudar a germinação e o armazenamento de sementes de Virola surinamensis (Rol. Warb. em condições de laboratório, no Estado do Amapá, Brasil. Para tanto, frutos foram coletados na Reserva Particular de Patrimônio Natural, "Ekinox", localizada em Macapá. Sementes recém-colhidas do lote original apresentaram teor médio de água de 24% e baixo ganho de água durante a embebição. Devido às diferenças no tamanho e, ou, peso, as sementes colhidas foram divididas em dois grupos: grandes e pequenas. Independentemente do tamanho da semente, a maior porcentagem de germinação e o menor tempo médio de germinação ocorreram a 30 ºC. Sementes armazenadas por 30 dias em condição ambiente (27 ºC ± 3 e 75% ± 5 UR e em germinador (20 ºC e 58% UR apresentaram viabilidade abaixo de 2%, ressaltando-se o comportamento recalcitrante de sementes de Virola surinamensis.The objective of this work was to study the germination and the storage of seeds of Virola surinamensis (Rol. Warb. in laboratory conditions, in the State of Amapa, Brazil. Fruits were harvested in the "Ekinox" Private Reserve of Natural Patrimony, located at Macapa. Seeds recently harvested in the original seedlot showed 24% mean water content and lower water gain, during soaking. Due to differences in the size and/or weight, the seeds were separated in two groups: large and small. Independently of seed size, the highest germination percentage and the lower average germination time occurred at 30ºC. Seeds stored under natural (27 ºC ± 3 e 75% ± 5 RU or germination chamber conditions (20 ºC e 58% RU showed viability lower than 2%, attesting the recalcitrant behavior of Virola surinamensis.

Rol del ortodoncista en ronquidos y apneas obstructivas

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B. M. Ester Hidalgo, Dra.

2013-05-01

Full Text Available Desde la década de los 80, los odontólogos de las especialidades de Ortodoncia y Cirugía Maxilofacial, integrados a un equipo multidisciplinario, juegan un rol importante en la terapia del ronquido y del Síndrome Apnea-Hipoapnea Obstructiva del Sueño (SAHOS. Este artículo describe los Dispositivos de Avance Mandibular (DAM como tratamiento del SAHOS, las consideraciones anatómicas, estudios sobre su efectividad y control de su eficiencia. Se clasifican y detalla su mecanismo de acción, criterios de elección y sus efectos secundarios. Se presentan 2 casos clínicos que utilizaron un DAM de diseño nacional durante un mes, donde previo y posterior al uso de este aparato se midió el Índice Apnea e Hipoapnea, ronquidos y saturación de oxígeno con el Apnealink. Como resultado, se obtuvo una disminución en los valores de todos estos índices, calificando el tratamiento con DAM como exitoso en la terapia del SAHOS.

Regional hydrogeological simulations. Numerical modelling using ConnectFlow. Preliminary site description Simpevarp sub area - version 1.2

Energy Technology Data Exchange (ETDEWEB)

Hartley, Lee; Hoch, Andrew; Hunter, Fiona; Jackson, Peter [Serco Assurance, Risley (United Kingdom); Marsic, Niko [Kemakta Konsult, Stockholm (Sweden)

2005-02-01

The Swedish Nuclear Fuel and Waste Management Company (SKB) carries out site investigations in two different candidate areas in Sweden with the objective of describing the in situ conditions for a bedrock repository for spent nuclear fuel. The two candidate areas are named Forsmark and Simpevarp. The site characterisation work is divided into two phases, an initial site investigation phase (IPLU) and a complete site investigation phase (KPLU). The results of IPLU are used as a basis for deciding on a subsequent KPLU phase. On the basis of the KPLU investigations a decision is made as to whether detailed characterisation will be performed (including sinking of a shaft).An integrated component in the site characterisation work is the development of site descriptive models. These comprise basic models in three dimensions with an accompanying text description. Central in the modelling work is the geological model which provides the geometrical context in terms of a model of deformation zones and the rock mass between the zones. Using the geological and geometrical description models as a basis, descriptive models for other geo-disciplines (hydrogeology, hydro-geochemistry, rock mechanics, thermal properties and transport properties) will be developed. Great care is taken to arrive at a general consistency in the description of the various models and assessment of uncertainty and possible needs of alternative models.Here, a numerical model is developed on a regional-scale (hundreds of square kilometres) to understand the zone of influence for groundwater flow that effects the Simpevarp area. Transport calculations are then performed by particle tracking from a local-scale release area (tens of square kilometres) to identify potential discharge areas for the site. The transport from the two site-scale release areas (a few square kilometres) at the Simpevarp site and the Laxemar site are also considered more specifically and using greater grid resolution.The main

Modelo de rol materno en la alimentación del lactante: Teoría del rango medio

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Rosario Edith Ortiz-Félix

Full Text Available Las interacciones madre-hijo durante la alimentación en el primer año de vida tienen impacto duradero en la regulación del apetito y el desarrollo de obesidad actual y futura del individuo. Para los profesionales de enfermería es un reto y una nueva función prevenir problemas nutricionales en los lactantes. Contar con teorías de rango medio propias de enfermería que guíen el cuidado diario resulta indispensable. El presente trabajo presenta el desarrollo de la teoría de rango medio Modelo de rol materno en la alimentación del lactante, mediante el método de derivación teórica de Fawcett. Este modelo tiene como objetivo explicar cómo características maternas y del lactante influyen en el rol materno de alimentación y estado nutricional del hijo en el primer año de vida. Mediante este modelo se ofrece sustento teórico para la investigación e intervenciones de enfermería enfocadas a prevenir problemas de nutrición en el lactante.

Os camisas azuis e Salazar. Rolão Preto e o fascismo em Portugal

OpenAIRE

Pinto, António Costa

2015-01-01

Este livro tem como objecto o estudo da acção política dos fascistas portugueses na primeira metade do século xx, concentrando-se no Movimento Nacional-Sindicalista de Rolão Preto, a expressão mais significativa e derradeira de um movimento fascista em Portugal. A diversidade documental que sustentou a investigação para este livro permitiu, creio, uma análise diacrónica dos movimentos fascistas portugueses no quadro de um processo de transição do liberalismo para o autoritar...

El rol del Estado y su influencia en las condiciones de vida de la mujer desplazada. Medellín, 2015

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Isabel Cristina Posada Zapata

2017-01-01

Full Text Available Este artículo se propone presentar la comprensión que han hecho las mujeres en situación de desplazamiento acerca del rol que ha desempeñado el Estado y su influencia en las condiciones de vida de la mujer desplazada. Se parte de un enfoque cualitativo, tomando para el análisis elementos de la teoría fundamentada de Strauss y Corbin. La muestra estuvo compuesta por 49 mujeres en situación de desplazamiento. Para el análisis se utilizó la codificación, categorización e interpretación y finalmente se llevó a cabo la teorización. El rol que desempeña el Estado colombiano influye desde la experiencia del desplazamiento hasta la percepción de salud/enfermedad y la búsqueda de soluciones en salud, ya que este ha dispuesto múltiples leyes para la protección de las mujeres desplazadas, pero pocas veces se han cumplido

Description of Supply Openings in Numerical Models for Room Air Distribution

DEFF Research Database (Denmark)

Nielsen, Peter V.

This paper discusses various possibilities for describing supply openings in numerical models of room air distribution.......This paper discusses various possibilities for describing supply openings in numerical models of room air distribution....

Expression of self-complementary hairpin RNA under the control of the rolC promoter confers systemic disease resistance to plum pox virus without preventing local infection.

Science.gov (United States)

Pandolfini, Tiziana; Molesini, Barbara; Avesani, Linda; Spena, Angelo; Polverari, Annalisa

2003-06-25

Homology-dependent selective degradation of RNA, or post-transcriptional gene silencing (PTGS), is involved in several biological phenomena, including adaptative defense mechanisms against plant viruses. Small interfering RNAs mediate the selective degradation of target RNA by guiding a multicomponent RNAse. Expression of self-complementary hairpin RNAs within two complementary regions separated by an intron elicits PTGS with high efficiency. Plum pox virus (PPV) is the etiological agent of sharka disease in Drupaceae, although it can also be transmitted to herbaceous species (e.g. Nicotiana benthamiana). Once inside the plant, PPV is transmitted via plasmodesmata from cell to cell, and at longer distances, via phloem. The rolC promoter drives expression in phloem cells. RolC expression is absent in both epidermal and mesophyll cells. The aim of the present study was to confer systemic disease resistance without preventing local viral infection. In the ihprolC-PP197 gene (intron hair pin rolC PPV 197), a 197 bp sequence homologous to the PPV RNA genome (from base 134 to 330) was placed as two inverted repeats separated by the DNA sequence of the rolA intron. This hairpin construct is under the control of the rolC promoter.N. benthamiana plants transgenic for the ihprolC-PP197 gene contain siRNAs homologous to the 197 bp sequence. The transgenic progeny of ihprolC-PP197 plants are resistant to PPV systemic infection. Local infection is unaffected. Most (80%) transgenic plants are virus free and symptomless. Some plants (20%) contain virus in uninoculated apical leaves; however they show only mild symptoms of leaf mottling. PPV systemic resistance cosegregates with the ihprolC-PP197 transgene and was observed in progeny plants of all independent transgenic lines analyzed. SiRNAs of 23-25 nt homologous to the PPV sequence used in the ihprolC-PP197 construct were detected in transgenic plants before and after inoculation. Transitivity of siRNAs was observed in

El liderazgo y el clima motivacional del entrenador como antecedentes de la cohesión y el rol percibido en futbolistas semiprofesionales

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Francisco Miguel Leo Marcos

2013-01-01

Full Text Available El principal objetivo del estudio es aplicar un modelo teórico para explicar cómo el tipo de liderazgo ejercido por los entrenadores puede influir en el clima motivacional, y cómo estos factores contextuales pueden determinar la cohesión grupal y la insatisfacción con el rol de los jugadores. Los participantes fueron 377 futbolistas que participaban en el grupo XIV de la Liga Nacional Española de Tercera División, los cuales rellenaron diferentes instrumentos para valorar el liderazgo, el clima motivacional, la cohesión y la insatisfacción con el rol. Los resultados señalan principalmente que los liderazgos que fomentan el refuerzo positivo presentan una predicción sobre el clima que implica a la tarea del entrenador y, en cambio, el liderazgo autocrático predice el clima que implica al ego. A su vez, el clima que implica a la tarea presenta una predicción positiva sobre la cohesión de equipo y el clima que implica al ego sobre la insatisfacción con el rol. La principal conclusión que se puede extraer del estudio es que los entrenadores deberán adoptar conductas de liderazgo positivo para fomentar un clima adecuado en el grupo y, de esta manera, aumentar la atracción e integración entre los componentes del equipo.

EL ROL DE LA EVALUACIÓN NEUROPSICOLÓGICA EN EL DIAGNÓSTICO Y EN EL SEGUIMIENTO DE LAS DEMENCIAS

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Matías Molina D.

2016-05-01

Full Text Available El aumento progresivo de la esperanza de vida ha impuesto nuevos desafíos en el abordaje de las patologías que sufren los adultos mayores. Las demencias son unas de las patologías más frecuentes en este grupo etario, causando la pérdida de autonomía de los pacientes y afectando la salud y calidad de vida de sus cuidadores. En conjunto con otros exámenes, la evaluación neuropsicológica cumple un rol fundamental en el proceso de diagnóstico de las demencias, objetivando el Deterioro Cognitivo, entregando información sobre la autonomía de los pacientes y cumpliendo un rol indispensable en el seguimiento de estas enfermedades. La siguiente revisión presentará la problemática y los primeros estudios cognitivos de las demencias, finalizando con una síntesis de las investigaciones que han contribuido a establecer los perfiles neuropsicológicos de las demencias con mayor incidencia en la población.

Roberto Dagnino, Twee leeuwen, één kruis. De rol van katholieke culturele kringen in e Vlaams-Nederlandse verstandhouding (1830-ca. 1900

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Tine Van Osselaer

2015-12-01

Full Text Available Roberto Dagnino, Twee leeuwen, één kruis. De rol van katholieke culturele kringen in de Vlaams-Nederlandse verstandhouding (1830-ca. 1900 (Dissertatie Rijksuniversiteit Groningen 2013; Hilversum: Verloren, 2015, 399 pp., isbn 978 90 8704 434 3.

El rol del tutor en un ambiente virtual de aprendizaje para la formación continua de docentes

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Juan Eusebio SILVA QUIROZ

2016-04-01

Full Text Available El potencial comunicativo de las tecnologías de la información y comunicación (TIC está transformando los ambientes de enseñanza y aprendizaje en los cuales han sido introducidas. Esta introducción ha adoptado, principalmente, dos formas: formación en línea o como complemento a la clase presencial. Estas tecnologías permiten la creación de entornos virtuales, bajo enfoques metodológicos no tradicionales, transitando desde un aprendizaje individual a un aprendizaje colaborativo, desde la transmisión a la construcción de conocimiento. En estos entornos, el rol del tutor es determinante para el éxito de una actividad formativa centrada más en la colaboración y construcción de conocimiento en red. Este artículo presenta los resultados preliminares de una investigación que busca conocer y caracterizar el rol pedagógico del tutor en la animación de los ambientes asíncronos de un espacio virtual de aprendizaje, en el contexto de un curso de formación a distancia para docentes.

Tüketici Temelli Marka Değerinin Marka Tercihlerine Etkisinde Ailenin Aracılık Rolü

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Erkan YILDIZ

2015-04-01

Full Text Available Bu çalışmanın birinci amacı; tüketici temelli marka değerinin alt boyutları olan; marka farkındalığı, algılanan kalite, marka çağrışımları ve marka sadakatinin marka tercihleri üzerine etkisini incelemek, ikinci amacı ise ailenin bu ilişkilerdeki aracılık rolünü araştırmaktır. Bu amaçla Ankara ilinde 295 kişinin katılımıyla bir çalışma yapılmıştır. Araştırma sonucunda; algılanan kalite ve marka sadakatinin marka tercihlerini pozitif yönde etkilerken, marka farkındalığı ve marka çağrışımlarının, marka tercihleri üzerinde bir etkisinin olmadığı aynı zamanda bu ilişkide ailenin de aracılık rolüne sahip olmadığı belirlenmiştir.

Introduction to precise numerical methods

CERN Document Server

Aberth, Oliver

2007-01-01

Precise numerical analysis may be defined as the study of computer methods for solving mathematical problems either exactly or to prescribed accuracy. This book explains how precise numerical analysis is constructed. The book also provides exercises which illustrate points from the text and references for the methods presented. All disc-based content for this title is now available on the Web. · Clearer, simpler descriptions and explanations ofthe various numerical methods· Two new types of numerical problems; accurately solving partial differential equations with the included software and computing line integrals in the complex plane.

Transformation of Lactuca sativa L. with rol C gene results in increased antioxidant potential and enhanced analgesic, anti-inflammatory and antidepressant activities in vivo.

Science.gov (United States)

Ismail, Hammad; Dilshad, Erum; Waheed, Mohammad Tahir; Sajid, Moniba; Kayani, Waqas Khan; Mirza, Bushra

2016-12-01

Lettuce is an important edible crop which possesses various medicinal properties. In this study Lactuca sativa L. (cv Grand Rapids) was transformed by Agrobacterium-mediated transformation with rol C gene. Transgene integration and expression was confirmed through PCR and semiquantitative RT-PCR. The transformed extracts were evaluated for their in vitro antioxidant and in vivo analgesic, anti-inflammatory and antidepressant activities in rats. The transformed plants showed 53-98 % increase in total phenolic and 45-58 % increase in total flavonoid contents compared with untransformed plants. Results of total reducing power and total antioxidant capacity exhibited 90-118 and 61-75 % increase in transformed plants, respectively. In contrast to control, DPPH, lipid peroxidation and DNA protection assay showed up to 37, 20 and 50 % enhancement in transformed plants, respectively. The extracts showed similar but significant enhancement behavior in hot plate analgesic and carrageenan-induced hind paw edema test. The transformed extracts showed 72.1 and 78.5 % increase for analgesic and anti-inflammatory activities, respectively. The transformants of rol C gene exhibited prominent antidepressant activity with 64-73 % increase compared with untransformed plants. In conclusion, the present work suggests that transformation with rol C gene can be used to generate lettuce with enhanced medicinally important properties, such as antioxidant, analgesic, anti-inflammatory and antidepressant potential.

Effects of silicon (Si) on arsenic (As) accumulation and speciation in rice (Oryza sativa L.) genotypes with different radial oxygen loss (ROL).

Science.gov (United States)

Wu, Chuan; Zou, Qi; Xue, Shengguo; Mo, Jingyu; Pan, Weisong; Lou, Laiqing; Wong, Ming Hung

2015-11-01

Arsenic (As) contamination of paddy soils has adversely affected the health of millions of people those consuming rice for staple food. The present study was aimed at investigating the effects of silicon (Si) fertilization on As uptake, speciation in rice plants with different radial oxygen loss (ROL). Six genotypes were planted in pot soils under greenhouse conditions until late tillering state. The results showed that the rates of ROL were higher in hybrid rice genotypes varying from 19.76 to 27 μmol O2 g(-1) root dry weight h(-1) than that in conventional indica rice genotypes varying from 9.55 to 15.41 μmol O2 g(-1) root dry weight h(-1). Si addition significantly increased straw biomass (price efficiently by combining Si fertilization and selecting genotypes with high radial oxygen loss. Copyright © 2015 Elsevier Ltd. All rights reserved.

Die rol van die blanke werker in die motivering van die swart werker

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G. J. Oosthuizen

1980-11-01

Opsomming Die motivering van die Swart werker kan nie in die huidige situasie in isolasie bestudeer word nie, omdat die Blanke werker steeds in die bestuursposisie is en daarom die motivering van die Swart werker kan beïnvloed. Hierdie ondersoek was daarop gerig om die rol van die Blanke werker in die motivering van die Swart werker nader te ondersoek. Die houding en die leierskapsbenadering van die Blanke werker teenoor die Swart werker is gemeet, asook die behoeftes wat volgens die Blanke werker by die Swart werker bestaan, bevredig is, of nie bestaan nie. Die behoeftes van Swart werkers, soos deur hulleself gesien, is ook ondersoek. Ten opsigte van sekere aspekte is beduidende verskille gevind.

Expression of self-complementary hairpin RNA under the control of the rolC promoter confers systemic disease resistance to plum pox virus without preventing local infection

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Spena Angelo

2003-06-01

Full Text Available Abstract Background Homology-dependent selective degradation of RNA, or post-transcriptional gene silencing (PTGS, is involved in several biological phenomena, including adaptative defense mechanisms against plant viruses. Small interfering RNAs mediate the selective degradation of target RNA by guiding a multicomponent RNAse. Expression of self-complementary hairpin RNAs within two complementary regions separated by an intron elicits PTGS with high efficiency. Plum pox virus (PPV is the etiological agent of sharka disease in Drupaceae, although it can also be transmitted to herbaceous species (e.g. Nicotiana benthamiana. Once inside the plant, PPV is transmitted via plasmodesmata from cell to cell, and at longer distances, via phloem. The rolC promoter drives expression in phloem cells. RolC expression is absent in both epidermal and mesophyll cells. The aim of the present study was to confer systemic disease resistance without preventing local viral infection. Results In the ihprolC-PP197 gene (intron hair pin rolC PPV 197, a 197 bp sequence homologous to the PPV RNA genome (from base 134 to 330 was placed as two inverted repeats separated by the DNA sequence of the rolA intron. This hairpin construct is under the control of the rolC promoter.N. benthamiana plants transgenic for the ihprolC-PP197 gene contain siRNAs homologous to the 197 bp sequence. The transgenic progeny of ihprolC-PP197 plants are resistant to PPV systemic infection. Local infection is unaffected. Most (80% transgenic plants are virus free and symptomless. Some plants (20% contain virus in uninoculated apical leaves; however they show only mild symptoms of leaf mottling. PPV systemic resistance cosegregates with the ihprolC-PP197 transgene and was observed in progeny plants of all independent transgenic lines analyzed. SiRNAs of 23–25 nt homologous to the PPV sequence used in the ihprolC-PP197 construct were detected in transgenic plants before and after inoculation

Numerical Models for Exact Description of in-situ Digital In-Line Holography Experiments with Irregularly-Shaped Arbitrarily-Located Particles

Directory of Open Access Journals (Sweden)

Marc Brunel

2015-04-01

Full Text Available We present the development of a numerical simulator for digital in-line holography applications. In-line holograms of arbitrarily shaped and arbitrarily located objects are calculated using generalized Huygens-Fresnel integrals. The objects are 2D opaque or phase objects. The optical set-up is described by its optical transfer matrix. A wide variety of optical systems, involving windows, spherical or cylindrical lenses, can thus be taken into account. It makes the simulator applicable for design and description of in situ experiments. We discuss future applications of this simulator for detection of nanoparticles in droplets, or calibration of airborne instruments that detect and measure ice crystals in the atmosphere.

El rol del profesor y la actividad demostrativa: una experiencia de aula empleando Geogebra

OpenAIRE

Mejía, Cristina; Molina, Óscar

2013-01-01

En esta experiencia de aula presento un ciclo didáctico que forma parte del trabajo de grado que estoy desarrollando para optar por el título de maestría en docencia de las Matemáticas. Pretendo exponer una experiencia en la que se analiza el rol del profesor, bajo la teoría de la mediación semiótica y fundamentado en la aproximación metodológica para la enseñanza del grupo Æ•G. Tal ciclo planteado en un aula de octavo grado, favorece la construcción de un sistema teórico local y se emplea un...

Rol cuidador en familias de usuarios de la unidad de atención de conductas adictivas

OpenAIRE

Rey de Cruz, Nelly

2010-01-01

Introducción: El objeto del estudio fue determinar las características del rol cuidador de las familias de los usuarios de la unidad de atención de conductas adictivas del hospital psiquiátrico San Camilo en la ciudad de Bucaramanga y su área metropolitana. Materiales y Métodos: Estudio descriptivo, población tomada de la base de datos del ESE Hospital Psiquiátrico San Camilo, donde participaron 10 familias de usuarios de la unidad de atención de conductas psicoactivas en Bucaramanga y su áre...

Narrative descriptions should replace grades and numerical ratings for clinical performance in medical education in the United States

Directory of Open Access Journals (Sweden)

Janice Lynn Hanson

2013-11-01

Full Text Available Background: In medical education, evaluation of clinical performance is based almost universally on rating scales for defined aspects of performance and scores on examinations and checklists. Unfortunately, scores and grades do not capture progress and competence among learners in the complex tasks and roles required to practice medicine. While the literature suggests serious problems with the validity and reliability of ratings of clinical performance based on numerical scores, the critical issue is not that judgments about what is observed vary from rater to rater but that these judgments are lost when translated into numbers on a scale. As the Next Accreditation System of the Accreditation Council on Graduate Medical Education (ACGME takes effect, medical educators have an opportunity to create new processes of evaluation to document and facilitate progress of medical learners in the required areas of competence.Proposal and initial experience: Narrative descriptions of learner performance in the clinical environment, gathered using a framework for observation that builds a shared understanding of competence among the faculty, promise to provide meaningful qualitative data closely linked to the work of physicians. With descriptions grouped in categories and matched to milestones, core faculty can place each learner along the milestones’ continua of progress. This provides the foundation for meaningful feedback to facilitate the progress of each learner as well as documentation of progress toward competence.Implications: This narrative evaluation system addresses educational needs as well as the goals of the Next Accreditation System for explicitly documented progress. Educators at other levels of education and in other professions experience similar needs for authentic assessment and, with meaningful frameworks that describe roles and tasks, may also find useful a system built on descriptions of learner performance in actual work settings

Microscopic description of nuclear reactions

International Nuclear Information System (INIS)

Gorbatov, A.M.

1992-01-01

The genealogical series method has been extended to the continuous spectrum of the many-body systems. New nonlinear integral equations have been formulated to perform the microscopical description of the nuclear reactions with arbitrary number of particles. The way to solve them numerically is demonstrated

Refugiados en Argentina. El rol de las organizaciones de derechos humanos de la comunidad peruana.

Directory of Open Access Journals (Sweden)

María Paula A. Cicogna

2009-09-01

Full Text Available Desde 1985 hasta hoy, Argentina se ha convertido en uno de los países en el mundo que más estatutos de refugio ha otorgado. Pero a pesar de ello, el Estado argentino no cumple a menudo con sus obligaciones. En este artículo se describirán, través del análisis del trabajo de campo realizado en esas organizaciones, las acciones llevadas a cabo por las O.N.G. formadas en el seno de la comunidad peruana, las cuales asumieron el rol de protectoras de los derechos humanos de los solicitantes de refugio y refugiados que viven en Buenos Aires.

EL ROL DEL TURISMO EN LA CONSOLIDACIÓN DE LA MARCA PAÍS DE ARGENTINA

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Echeverri Cañas, Lina María

2013-01-01

Full Text Available La globalización ha sido el punto de partida frente a la creciente competencia que se ha evidenciado en los últimos años entre los territorios (regiones, ciudades y países. Especialmente los países han adoptado e implementado estrategias de diferenciación para estimular el turismo y la inversión económica. El turismo se ha consolidado como una de las principales fuentes de divisas para los países latinoamericanos. Este artículo analiza el rol del turismo en el proceso de consolidación de la marca país de Argentina.

Las dificultades de sentir: el rol de las emociones en la estigmatización del VIH/SIDA

Science.gov (United States)

MARZÁN-RODRÍGUEZ, Melissa; VARAS-DÍAZ, Nelson

2009-01-01

Resumen El Virus de Inmunodeficiencia Humana (VIH) y el Síndrome de Inmunodeficiencia Adquirida (SIDA) han sido motivo de estigmatización para las personas que viven con ellos. Esta estigmatización se ha estudiado consecuentemente desde la perspectiva de opiniones de agentes estigmatizantes. Estas opiniones han obviado sistemáticamente el rol de las emociones en el proceso de estigmatización. Llevamos a cabo este estudio con el propósito de identificar el rol de las emociones en el proceso de estigmatización de las personas que viven con el virus (PVVS) por parte de profesionales de la salud. Para lograr este objetivo utilizamos un diseño exploratorio y cualitativo en el cual utilizamos la técnica de entrevistas semiestructuradas a profundidad. La muestra estuvo compuesta por 80 profesionales de la salud y estudiantes de las siguientes especialidades: psicología, trabajo social, medicina y enfermería. Los resultados reflejaron la existencia de emociones asociadas al VIH/SIDA tales como pena, lástima, compasión, asco, fobia y miedo entre los/as profesionales y estudiantes que participaron. Las personas participantes evidenciaron la necesidad de controlar sus emociones al interactuar con PVVS. Los resultados apuntan a la necesidad de explorar aquellos factores que mediatizan las emociones, tales como el contexto social en que se manifiestan y ante quiénes se revelan, para lograr entender a cabalidad el estigma que rodea al VIH/SIDA. PMID:20212916

Las percepciones sociales en Europa sobre el rol de la ciencia y la tecnología

OpenAIRE

Eizagirre, Andoni

2018-01-01

Este artículo indaga las variables que mejor explican las percepciones y actitudes de los europeos relativas a la ciencia y sus innovaciones más recientes. La hipótesis del déficit cognitivo asocia la creciente ambivalencia social a la escasa alfabetización científica y comprensión de los avances científico-técnicos. El artículo se compromete con el rol analítico de la perspectiva contextual, identifica diez mitos ligados a la explicación tradicional sobre percepción social de la ciencia, y s...

EL SUELO AL SERVICIO DE LA SOCIEDAD Y SU ROL EN EL CONTEXTO DE LOS CAMBIOS GLOBALES

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Hernán Burbano Orjuela

2010-07-01

Full Text Available Este artículo examina la relación entre suelo, vida y sociedad y destaca que el primero es el soporte del complejo sistema propio del planeta. Señala que en las disfunciones del sistema terrestre se inscriben los problemas del suelo. Alude a los cambios globales contemporáneos y al rol del suelo en este contexto. Y, finalmente, destaca que el suelo se ubica en un planeta que funciona como un sistema que se debe mantener en condiciones adecuadas para la vida.

Transformation of Lettuce with rol ABC Genes: Extracts Show Enhanced Antioxidant, Analgesic, Anti-Inflammatory, Antidepressant, and Anticoagulant Activities in Rats.

Science.gov (United States)

Ismail, Hammad; Dilshad, Erum; Waheed, Mohammad Tahir; Mirza, Bushra

2017-03-01

Lettuce is an edible crop that is well known for dietary and antioxidant benefits. The present study was conducted to investigate the effects of rol ABC genes on antioxidant and medicinal potential of lettuce by Agrobacterium-mediated transformation. Transgene integration and expression was confirmed through PCR and real-time RT-PCR, respectively. The transformed plants showed 91-102 % increase in total phenolic contents and 53-65 % increase in total flavonoid contents compared to untransformed plants. Total antioxidant capacity and total reducing power increased up to 112 and 133 % in transformed plants, respectively. Results of DPPH assay showed maximum 51 % increase, and lipid peroxidation assay exhibited 20 % increase in antioxidant activity of transformed plants compared to controls. Different in vivo assays were carried out in rats. The transgenic plants showed up to 80 % inhibition in both hot plate analgesic assay and carrageenan-induced hind paw edema test, while untransformed plants showed only 45 % inhibition. Antidepressant and anticoagulant potential of transformed plants was also significantly enhanced compared to untransformed plants. Taken together, the present work highlights the use of rol genes to enhance the secondary metabolite production in lettuce and improve its analgesic, anti-inflammatory, antidepressant, and anticoagulatory properties.

Fortalecimiento del rol de la CIDH en el proceso de supervisión de cumplimiento de sentencias y planteamiento de reparaciones ante la Corte IDH

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Jorge Calderón Gamboa

2014-06-01

Full Text Available La ejecución de las sentencias de la Corte Interamericana de Derechos Humanos a través de la implementación de las medidas de reparación integral dispuestas por la misma, representa la cristalización y efectividad del sistema interamericano de protección de los derechos humanos en su conjunto, es por ello que el autor plantea que la reformulación estratégica de la labor de la Comisión Interamericana de Derechos Humanos en estos procedimientos merece una reflexión. Este artículo analiza el rol de la Comisión Interamericana de Derechos Humanos en el procedimiento de supervisión de sentencias ante la Corte IDH, proponiendo una reformulación de su labor con base a su función como garante del orden público interamericano. Asimismo, propone el fortalecimiento de su rol en el planteamiento de reparaciones ante la Corte IDH.

Surface characterization of activated chalcopyrite particles via the FLSmidth ROL process. Part 1: Electron microscope investigations

DEFF Research Database (Denmark)

Karcz, Adam Paul; Damø, Anne Juul; Illerup, Jytte Boll

Because of its unique semiconductor properties, the world’s most abundant copper mineral (chalcopyrite) is refractory with respect to atmospheric leaching using traditional ferric sulfate lixiviants. A novel approach to address this issue – conducted at FLSmidth – utilizes a mechanochemical Rapid...... of copper(II) to dope the semiconductor lattice and thereby "activate" the chalcopyrite, thereby reducing leach times below 2 hours (>98% recovery). Because the activation plays a major role in accelerating the leaching step, it is critical to understand the nature of this intermediate and its part...... in the ROL process. The current work presents results from electron microscope investigations of surface-activated particles....

El rol de las familias españolas con hijos con discapacidad en la inclusión educativa. Una mirada histórico-normativa

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Fran J. García-García

2016-12-01

Full Text Available García-García, F. J. y López-Torrijo, M. (2016: “El rol de las familias españolas con hijos con discapacidad en la inclusión educativa. Una mirada histórico-normativa”. Revista Española de Discapacidad, 4 (2: 219-233.

Trabajando con tecnologías y afrontando el tecnoestrés: el rol de las creencias de eficacia

OpenAIRE

MARISA SALANOVA SORIA

2003-01-01

El objetivo del presente trabajo es describir qué es y cómo se produce el proceso de tecnoestrés en el marco mas global del 'Modelo Demandas-Recursos', con especial énfasis en describir los principales resultados de la investigación reciente sobre el rol amortiguador que tienen las creencias de eficacia en todo este proceso. Para ello se revisa en primer lugar el concepto de tecnoestrés ofreciendo una definición comprehensiva del constructo. En segundo lugar, se contextualiza el tecnoestrés e...

Experiment list: SRX092302 [Chip-atlas[Archive

Lifescience Database Archive (English)

Full Text Available rol description=This data represents a control being compared to experiments usin...g antibody eGFP-HDAC8 || control=Control_eGFP-HDAC8 || control description=This data represents a control being

Custos, desempenho e estrutura educacional do ensino fundamental: uma análise no município de Rolândia/PR

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Davi Winter Catelan

2016-05-01

Full Text Available Este artigo objetiva analisar as relações entre custos, desempenho e estrutura das diferentes unidades escolares de ensino fundamental da cidade de Rolândia/PR. O estudo tem caráter quantitativo e descritivo, desenvolvendo uma pesquisa de levantamento no município de Rolândia/PR. Para a analise dos dados utiliza-se a estatística descritiva e a análise de correlação. Como resultado, verifica-se que há assimetrias na relação custo/aluno existente entre as escolas pesquisadas, sendo necessário realizar novos estudos para verificar possíveis causas dessas diferenças encontradas. Ademais, nota-se que as escolas que obtiveram maior custo/aluno não necessariamente apresentaram os melhores desempenhos no Índice de Desenvolvimento da Educação Básica [IDEB]. Outro dado do estudo, revelado pela análise de correlação, é de que professores mais experientes conseguem extrair um melhor aprendizado dos alunos. Convém destacar que este trabalho é um esforço inicial para que se desenvolva junto aos municípios mecanismos para melhor gerenciamento dos serviços públicos.

Experiment list: SRX142529 [Chip-atlas[Archive

Lifescience Database Archive (English)

Full Text Available rol=Control_50bp || control description=This data represents a control being compared to experiments using r...trol_50bp || control description=This data represents a control being compared to experiments using read len

Cuidador familiar del niño con cáncer: un rol en transición

OpenAIRE

Sonia Carreño-Moreno; Lorena Chaparro- Díaz; Paola Blanco-Sánchez

2017-01-01

El objetivo de este artículo es integrar los hallazgos derivados de investigación que evidencian que el ser cuidador de un niño con cáncer denota un rol en transición. La metodología que se empleó fue la revisión integrativa de literatura que incluyó la búsqueda sistemática de esta, una lectura crítica de las publicaciones, la integración de hallazgos con apoyo en Atlas Ti ver- sión 7, en un proceso de comparación constante. Pudo ¿verse que el cuidador del niño con cán - cer ...

Mathematical and numerical modelling of fluids at Nano-metric scales

International Nuclear Information System (INIS)

Joubaud, R.

2012-01-01

This work presents some contributions to the mathematical and numerical modelling of fluids at Nano-metric scales. We are interested in two levels of modelling. The first level consists in an atomic description. We consider the problem of computing the shear viscosity of a fluid from a microscopic description. More precisely, we study the mathematical properties of the nonequilibrium Langevin dynamics allowing to compute the shear viscosity. The second level of description is a continuous description, and we consider a class of continuous models for equilibrium electrolytes, which incorporate on the one hand a confinement by charged solid objects and on the other hand non-ideality effects stemming from electrostatic correlations and steric exclusion phenomena due to the excluded volume effects. First, we perform the mathematical analysis of the case where the free energy is a convex function (mild non-ideality). Second, we consider numerically the case where the free energy is a non convex function (strong non-ideality) leading in particular to phase separation. (author)

Orientación al rol de género y uso de tabaco y alcohol en jóvenes de Morelos, México Gender role orientation and tobacco and alcohol use among youth in Morelos, Mexico

OpenAIRE

Rubén Chávez-Ayala; Leonor Rivera-Rivera; Ahideé Leyva-López; Marcela Sánchez-Estrada; Eduardo Lazcano-Ponce

2013-01-01

OBJETIVO: Cuantificar la asociación entre orientación al rol de género y uso de tabaco y alcohol en jóvenes del estado de Morelos. MATERIAL Y MÉTODOS: Estudio transversal realizado en 2004-2005, en jóvenes de 14 a 24 años (n=1 730). Variables sociodemográficas (zona de residencia, nivel socioeconómico); familiares (educación y violencia paternal); psicosociológicas (rol de género, autoestima, depresión, consumo de alcohol, tabaco, locus de control, abuso sexual). Análisis por regresión logíst...

Experiment list: SRX092299 [Chip-atlas[Archive

Lifescience Database Archive (English)

Full Text Available rol description=This data represents a control being compared to experiments usin...g antibody eGFP-NR4A1 || control=Control_eGFP-NR4A1 || control description=This data represents a control being

CAPACIDAD ANTIOXIDANTE EN RATAS DIABÉTICAS ROL DE LA VITAMINA E

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R. Oré Valdivieso

2014-06-01

Full Text Available En el presente estudio se analizó el rol antioxidante de la vitamina E, administrada a ratas diabéticas, evaluando los cambios en la glicemia, hemoglobina glicosilada (HbA1c, lipoperoxidación, antioxidantes totales, albúmina y proteínas totales. Se trabajó con 4 grupos de animales de experimentación: I Control, II control más vitamina E (25 mg/día, III Diabético inducidos con estreptozotocina (35 mg/kg y IV Diabético más vitamina E. Después de 8 semanas de tratamiento, con insulina 4 U/kg de peso observamos que en animales diabéticos con suplemento vitamínico mejora la glicemia y disminuyen los niveles de HbA1c. En los grupos diabéticos y control que recibieron vitamina E disminuyen los niveles de lipoperoxidación en un 25%, comparados con los que no recibieron el suplemento. Nuestros resultados sugieren que la vitamina E tiende a mejorar la glicemia, disminuir la HbA1c y peroxidación lipídica y aumenta los antioxidantes totales en el grupo diabético.

Rol y condiciones estratégicas del médico dentro del Sistema de Gestión de Seguridad y Salud Ocupacional

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Óscar Eduardo Vera-Romero

2015-03-01

Full Text Available El impacto negativo de los accidentes laborales es tanto sanitario como económico. Se calcula que cerca de 2,3 millones de muertes al año se deben por trabajo. Existen factores de riesgo, como exposición a riesgos físicos, químicos, biológicos, psicosociales y ergonómicos ocasionando desequilibrio de salud y causar accidentes, enfermedades. Para proteger la salud en estos campos existe la Medicina del Trabajo. El Objetivo de este estudio es describir el rol y condiciones estratégicas del médico dentro del sistema de gestión de seguridad y salud ocupacional. Materiales y Métodos: Revisión bibliográfica en BIREME, Scielo Perú, España, Colombia y publicaciones de la International Labour Organización (ILO. Conclusión: El Rol Estratégico del Médico dentro del Sistema de Gestión de Seguridad y Salud Ocupacional presenta los enfoques: humano, médico-legal, económico y social; con responsabilidad directa en la implementación de políticas y programas de salud ocupacional, basado en los códigos de ética nacional e internacional.

Numerical solution of integral equations, describing mass spectrum of vector mesons

International Nuclear Information System (INIS)

Zhidkov, E.P.; Nikonov, E.G.; Sidorov, A.V.; Skachkov, N.B.; Khoromskij, B.N.

1988-01-01

The description of the numerical algorithm for solving quasipotential integral equation in impulse space is presented. The results of numerical computations of the vector meson mass spectrum and the leptonic decay width are given in comparison with the experimental data

Numerical Calculation of Transport Based on the Drift-Kinetic Equation for Plasmas in General Toroidal Magnetic Geometry: Numerical Methods

International Nuclear Information System (INIS)

Reynolds, J. M.; Lopez-Bruna, D.

2009-01-01

In this report we continue with the description of a newly developed numerical method to solve the drift kinetic equation for ions and electrons in toroidal plasmas. Several numerical aspects, already outlined in a previous report [Informes Tecnicos Ciemat 1165, mayo 2009], will be treated now in more detail. Aside from discussing the method in the context of other existing codes, various aspects will be now explained from the viewpoint of numerical methods: the way to solve convection equations, the adopted boundary conditions, the real-space meshing procedures along with a new software developed to build them, and some additional questions related with the parallelization and the numerical integration. (Author) 16 refs

TYPES OF SCIENTIFIC DESCRIPTIONS IN ROMANIAN GEOGRAPHY TEXTBOOKS

Directory of Open Access Journals (Sweden)

VIORICA BLÎNDA

2012-01-01

Full Text Available This study will provide a brief look into the numerous aspects of description as a unit of discourse and into the/as well as into those/distinctive discourse methods. The perspectives of the proposed analysis emphasize that description as a unit of discourse is no longer denigrated and that it has regained its well-defined place within the discourse (especially within the discourse of geography as a primary unit of discourse. The analysis is based on a corpus of studies represented by texts of geography available in geography textbooks. Through this study there will be outlined a number of methods and strategies of the discursive process through description.

Gaps in nonsymmetric numerical semigroups

International Nuclear Information System (INIS)

Fel, Leonid G.; Aicardi, Francesca

2006-12-01

There exist two different types of gaps in the nonsymmetric numerical semigroups S(d 1 , . . . , d m ) finitely generated by a minimal set of positive integers {d 1 , . . . , d m }. We give the generating functions for the corresponding sets of gaps. Detailed description of both gap types is given for the 1st nontrivial case m = 3. (author)

Minimum Description Length Shape and Appearance Models

DEFF Research Database (Denmark)

Thodberg, Hans Henrik

2003-01-01

The Minimum Description Length (MDL) approach to shape modelling is reviewed. It solves the point correspondence problem of selecting points on shapes defined as curves so that the points correspond across a data set. An efficient numerical implementation is presented and made available as open s...

Sintomatología en adolescentes victimizados sexualmente: El rol del apoyo de la familia y del grupo de pares

Directory of Open Access Journals (Sweden)

Cristobal Guerra

2016-11-01

Full Text Available Existe suficiente evidencia de que el apoyo que entrega la familia, especialmente los padres, previene la aparición de sintomatología en adolescentes que han sufrido abuso sexual. No obstante, el estudio del rol que juega el apoyo entregado por el grupo de pares no ha sido suficientemente investigado y las pocas investigaciones en la materia han entregado resultados contradictorios. De este modo, el objetivo del presente estudio es evaluar la relación tanto del apoyo de la familia, como del de los pares con la sintomatología depresiva, ansiosa y de estrés postraumático en víctimas de abuso sexual. Participaron 93 adolescentes de género femenino (edades entre 12 y 17 años. Las participantes respondieron escalas para evaluar la sintomatología y para evaluar su percepción del apoyo social recibido. Los resultados de un análisis de regresión múltiple muestran que la percepción de apoyo por parte de la familia se asocia inversamente a los tres tipos de síntomas. En cambio, la percepción de apoyo de los pares únicamente se asocia inversamente a la sintomatología depresiva. Estos resultados dan cuenta de que la familia sigue siendo el principal agente protector, aún en la etapa de la adolescencia. Los pares, en cambio, poseerían menos recursos de protección y su rol estaría más centrado en la distracción.

Mastitis Olgularında Virusların Rolü "The roles of Viruses in Mastitis"

OpenAIRE

ALPAY, Gizem; YEŞİLBAĞ, Kadir

2014-01-01

Bu derlemede özellikle sığır mastitis olgularının etiyolojisinde virusların rolleri irdelenmiştir. Viruslar sığır mastitis olgularında hem hazırlayıcı hem de primer etiyolojik ajan olarak rol oynayabilirler. Bovine herpesvirus 2, vaccinia virus, sığır çiçeği virusu, yalancı sığır çiçeği virusu, vesicular stomatitis virusu, şap hastalığı virusu ve bovine papillomavirus memede lezyon oluşturarak memenin doğal savunma mekanizmasını sekteye uğratırlar. Bovine herpesvirus 1, bovine viral diarrhoea...

Optimismo, indefensión, estrés de rol, burnout y bienestar subjetivo en docentes de educación secundaria.

OpenAIRE

Cordero Varela, Marina

2016-01-01

[ES]Se explora la relación entre las variables optimismo fundado (OF), optimismo disposicional (OD), estrés de rol (ER), “corazón” de burnout (CB) y bienestar subjetivo (BS), haciendo énfasis en la distinción entre indefensión ambiental (HA) e indefensión personal (HP). Conforman la muestra 147 docentes de educación secundaria y bachillerato procedentes de 8 centros diferentes de las provincias de León y Salamanca. En cuanto a los instrumentos de medida, se utilizó la BEEGC-R28 para medir ...

INTRA/Mod3.2. Manual and code description. Volume 2 - User's manual

International Nuclear Information System (INIS)

Andersson, Jenny; Edlund, O.; Hermann, J.; Johansson, Lise-Lotte

1999-01-01

The INTRA Manual consists of two volumes. Volume I of the manual is a thorough description of the code INTRA, the physical modelling of INTRA and the ruling numerics, and volume II, the User's Manual is an input description. This document, the User's Manual, Volume II, contains a detailed description of how to use INTRA, how to set up an input file, how to run INTRA and also post-processing

Formas microfinancieras comunitarias, identificación, tipificación y diagnóstico para determinar su rol como entes proveedoras de servicios financieros

Directory of Open Access Journals (Sweden)

Alexandra Verduga Pino

2013-12-01

Full Text Available El objetivo de este trabajo de investigación ha sido identificar, tipificar y diagnosticar las distintas FMC (formas microfinancieras comunitarias, existentes en los cantones de Portoviejo, Montecristi y Jipijapa para determinar su rol como entes proveedoras de servicios microfinancieros, la utilización de la metodología de Evaluación Rural Participativa, ERP fue la herramienta de apoyo que discurre algunas técnicas que tienen como objetivo involucrar a los grupos (comunidades en el proceso de investigación, programación y evaluación. Se realiza un mapeo por cantón, se logra una completa base de datos Excel con toda la información levantada en las 75 comunidades generada con la implementación de 400 encuestas aplicada a directivos de cada una de las FMC identificadas. La información se organizó en 27 reportes, entre ellos la tipificación de las diferentes FMC, detallando su origen, su rol, su dinámica social de funcionamiento, las acciones financieras, mecanismos y metodología de manejo de dinero. En conclusión se identifican 50 FMC en Portoviejo, 111 FMC en Montecristi y 56 FMC en Jipijapa. PALABRAS CLAVE: Formas micro financieras comunitarias.

Rol de las parejas en el proceso terapeutico de mujeres sobrevivientes de abuso sexual incestuoso

Directory of Open Access Journals (Sweden)

Ana María Rodríguez Tapia

2013-07-01

Full Text Available En esta investigación se realizó un estudio de caso único, que permite confirmar y ampliar el conocimiento existente acerca de las sobrevivientes de abuso sexual incestuoso, en relación al rol que cumple la pareja en el proceso terapéutico. Los resultados arrojaron que existe una influencia recíproca entre la experiencia de abuso sexual y la relación de pareja, fundamentado en la evaluación que hace la terapeuta del estado de la paciente y en el discurso de la sobreviviente con respecto al daño que percibe del maltrato psicológico recibido por su pareja. Se proponen consideraciones para el trabajo terapéutico, enfatizando la importancia de incorporar a la pareja, de modo que éste sea un recurso y no una limitante para la terapia.

Regional hydrogeological simulations for Forsmark - numerical modelling using DarcyTools. Preliminary site description Forsmark area version 1.2

Energy Technology Data Exchange (ETDEWEB)

NONE

2005-12-15

A numerical model is developed on a regional-scale (hundreds of square kilometres) to study the zone of influence for variable-density groundwater flow that affects the Forsmark area. Transport calculations are performed by particle tracking from a local-scale release area (a few square kilometres) to test the sensitivity to different hydrogeological uncertainties and the need for far-field realism. The main objectives of the regional flow modelling were to achieve the following: I. Palaeo-hydrogeological understanding: An improved understanding of the palaeohydrogeological conditions is necessary in order to gain credibility for the site descriptive model in general and the hydrogeological description in particular. This requires modelling of the groundwater flow from the last glaciation up to present-day with comparisons against measured TDS and other hydro-geochemical measures. II. Simulation of flow paths: The simulation and visualisation of flow paths from a tentative repository area is a means for describing the role of the current understanding of the modelled hydrogeological conditions in the target volume, i.e. the conditions of primary interest for Safety Assessment. Of particular interest here is demonstration of the need for detailed far-field realism in the numerical simulations. The motivation for a particular model size (and resolution) and set of boundary conditions for a realistic description of the recharge and discharge connected to the flow at repository depth is an essential part of the groundwater flow path simulations. The numerical modelling was performed by two separate modelling teams, the ConnectFlow Team and the DarcyTools Team. The work presented in this report was based on the computer code DarcyTools developed by Computer-aided Fluid Engineering. DarcyTools is a kind of equivalent porous media (EPM) flow code specifically designed to treat flow and salt transport in sparsely fractured crystalline rock intersected by transmissive

Regional hydrogeological simulations for Forsmark - numerical modelling using DarcyTools. Preliminary site description Forsmark area version 1.2

International Nuclear Information System (INIS)

Follin, Sven; Stigsson, Martin; Svensson, Urban

2005-12-01

A numerical model is developed on a regional-scale (hundreds of square kilometres) to study the zone of influence for variable-density groundwater flow that affects the Forsmark area. Transport calculations are performed by particle tracking from a local-scale release area (a few square kilometres) to test the sensitivity to different hydrogeological uncertainties and the need for far-field realism. The main objectives of the regional flow modelling were to achieve the following: I. Palaeo-hydrogeological understanding: An improved understanding of the palaeohydrogeological conditions is necessary in order to gain credibility for the site descriptive model in general and the hydrogeological description in particular. This requires modelling of the groundwater flow from the last glaciation up to present-day with comparisons against measured TDS and other hydro-geochemical measures. II. Simulation of flow paths: The simulation and visualisation of flow paths from a tentative repository area is a means for describing the role of the current understanding of the modelled hydrogeological conditions in the target volume, i.e. the conditions of primary interest for Safety Assessment. Of particular interest here is demonstration of the need for detailed far-field realism in the numerical simulations. The motivation for a particular model size (and resolution) and set of boundary conditions for a realistic description of the recharge and discharge connected to the flow at repository depth is an essential part of the groundwater flow path simulations. The numerical modelling was performed by two separate modelling teams, the ConnectFlow Team and the DarcyTools Team. The work presented in this report was based on the computer code DarcyTools developed by Computer-aided Fluid Engineering. DarcyTools is a kind of equivalent porous media (EPM) flow code specifically designed to treat flow and salt transport in sparsely fractured crystalline rock intersected by transmissive

Experiment list: SRX092307 [Chip-atlas[Archive

Lifescience Database Archive (English)

Full Text Available w signal before peaks are called. || control=Control_eGFP-NR4A1 || control description=This data represents a control being...rol_eGFP-NR4A1 || control description=This data represents a control being compared to experiments using ant

Masonry constructions mechanical models and numerical applications

CERN Document Server

Lucchesi, Massimiliano; Padovani, Cristina

2008-01-01

Numerical methods for the structural analysis of masonry constructions can be of great value in assessing the safety of artistically important masonry buildings and optimizing potential operations of maintenance and strengthening in terms of their cost-effectiveness, architectural impact and static effectiveness. This monograph firstly provides a detailed description of the constitutive equation of masonry-like materials, clearly setting out its most important features. It then goes on to provide a numerical procedure to solve the equilibrium problem of masonry solids. A large portion of the w

Multiparticle model for the description of the neutron-production in the plasma focus

International Nuclear Information System (INIS)

Ruhs, N.

Following a comparison of the various numerical methods the experimental set-up is described. This is followed by a brief description of the MHD computation on which the particle computation is to be based. A description is given of the methods applied for the particle computation

INTRA/Mod3.2. Manual and Code Description. Volume I - Physical Modelling

International Nuclear Information System (INIS)

Andersson, Jenny; Edlund, O.; Hermann, J.; Johansson, Lise-Lotte

1999-01-01

The INTRA Manual consists of two volumes. Volume I of the manual is a thorough description of the code INTRA, the Physical modelling of INTRA and the ruling numerical methods and volume II, the User's Manual is an input description. This document, the Physical modelling of INTRA, contains code characteristics, integration methods and applications

INTRA/Mod3.2. Manual and Code Description. Volume I - Physical Modelling

Energy Technology Data Exchange (ETDEWEB)

Andersson, Jenny; Edlund, O; Hermann, J; Johansson, Lise-Lotte

1999-01-01

The INTRA Manual consists of two volumes. Volume I of the manual is a thorough description of the code INTRA, the Physical modelling of INTRA and the ruling numerical methods and volume II, the User`s Manual is an input description. This document, the Physical modelling of INTRA, contains code characteristics, integration methods and applications

Single-phase multi-dimensional thermohydraulics direct numerical simulation code DINUS-3. Input data description

Energy Technology Data Exchange (ETDEWEB)

Muramatsu, Toshiharu [Power Reactor and Nuclear Fuel Development Corp., Oarai, Ibaraki (Japan). Oarai Engineering Center

1998-08-01

This report explains the numerical methods and the set-up method of input data for a single-phase multi-dimensional thermohydraulics direct numerical simulation code DINUS-3 (Direct Numerical Simulation using a 3rd-order upwind scheme). The code was developed to simulate non-stationary temperature fluctuation phenomena related to thermal striping phenomena, developed at Power Reactor and Nuclear Fuel Development Corporation (PNC). The DINUS-3 code was characterized by the use of a third-order upwind scheme for convection terms in instantaneous Navier-Stokes and energy equations, and an adaptive control system based on the Fuzzy theory to control time step sizes. Author expect this report is very useful to utilize the DINUS-3 code for the evaluation of various non-stationary thermohydraulic phenomena in reactor applications. (author)

ANALISIS DEL ROL DE LA DEFENSORIA DEL PUEBLO EN LA APLICACION DE LOS DERECHO DE LA TERCERA EDAD EN LA CIUDAD DE CUCUTA

OpenAIRE

Mora Pallares, Juan Carlos; Rincon Florez, Fredy Alexander; Sayago Alzamora, Carlos Armando

2006-01-01

El presente trabajo abarca todo lo concerniente a la situación de las personas de la tercera edad del país, donde se analiza la situación de los derechos humanos, en cuanto a la atención condiciones laborales, salud, bienestar en general; finalizando con las conclusiones y recomendaciones. El objeto del trabajo consistió en analizar el Rol de la Defensoría del Pueblo para que se cumplan los Derechos de estas personas.

El rol de los ingresos tributarios en el manejo de la deuda pública y su incidencia en la estabilidad presupuestaria en Ecuador

OpenAIRE

Celi Masache, Maryuri Elizabeth

2016-01-01

El presente trabajo de investigación tiene como eje trascendental de su contenido los ingresos tributarios y su rol en las fases de la deuda pública, como componentes vinculados de la actividad financiera del Estado; la realidad financiera del Estado ecuatoriano introduce al estudio del presupuesto y la planificación nacional para vislumbrar el manejo de la deuda pública atendiendo muy especialmente a los principios de equilibrio, estabilidad presupuestaria y sostenibilidad financiera. El ...

El rol de las percepciones y los conocimientos de las madres en el estado nutricional de sus niños

OpenAIRE

Alcázar, Lorena; Marini, Alessandra; Walker, Ian

2011-01-01

El objetivo del presente estudio es analizar los factores determinantes de la desnutrición infantil (talla para la edad de los niños menores de 2 años), con énfasis en el análisis del rol del conocimiento de las madres sobre nutrición infantil en relación con el crecimiento y desarrollo de sus hijos. Se busca, además, explorar los mecanismos por cuya vía las madres obtienen estos conocimientos y forman sus percepciones, y analizar los canales mediante los cuales estos afectan el desarrollo de...

El papel de las tic en el rol del docente: una aproximación holística, identitaria y generacional.

OpenAIRE

Legarda, Imanol; de Juan Goikoetxea, Ainhoa

2016-01-01

A raíz del estudio de las TIC en Educación (Legarda) y el estudio de la Cultura Visual en la identidad de las docentes (De Juan) nace esta aproximación holística, identitaria y generacional del papel determinante que juegan las TIC en el rol de la docencia. Desde la revisión teórica se analiza el nuevo contexto educacional en la Sociedad Web, con especial hincapié en la problemática de la Brecha Digital y la potencialidad de las TIC para hacer frente a los retos y pronóst...

FURNACE; a toroidal geometry neutronic program system method description and users manual

International Nuclear Information System (INIS)

Verschuur, K.A.

1984-12-01

The FURNACE program system performs neutronic and photonic calculations in 3D toroidal geometry for application to fusion reactors. The geometry description is quite general, allowing any torus cross section and any neutron source density distribution for the plasma, as well as simple parametric representations of circular, elliptic and D-shaped tori and plasmas. The numerical method is based on an approximate transport model that produces results with sufficient accuracy for reactor-design purposes, at acceptable calculational costs. A short description is given of the numerical method, and a user manual for the programs of the system: FURNACE, ANISN-PT, LIBRA, TAPEMA and DRAWER is presented

Incorporation of the capillary hysteresis model HYSTR into the numerical code TOUGH

International Nuclear Information System (INIS)

Niemi, A.; Bodvarsson, G.S.; Pruess, K.

1991-11-01

As part of the work performed to model flow in the unsaturated zone at Yucca Mountain Nevada, a capillary hysteresis model has been developed. The computer program HYSTR has been developed to compute the hysteretic capillary pressure -- liquid saturation relationship through interpolation of tabulated data. The code can be easily incorporated into any numerical unsaturated flow simulator. A complete description of HYSTR, including a brief summary of the previous hysteresis literature, detailed description of the program, and instructions for its incorporation into a numerical simulator are given in the HYSTR user's manual (Niemi and Bodvarsson, 1991a). This report describes the incorporation of HYSTR into the numerical code TOUGH (Transport of Unsaturated Groundwater and Heat; Pruess, 1986). The changes made and procedures for the use of TOUGH for hysteresis modeling are documented

Fusion Engineering Device. Volume II. Design description

International Nuclear Information System (INIS)

1981-10-01

This volume summarizes the design of the FED. It includes a description of the major systems and subsystems, the supporting plasma design analysis, a projected device cost and associated construction schedule, and a description of the facilities to house and support the device. This effort represents the culmination of the FY81 studies conducted at the Fusion Engineering Design Center (FEDC). Unique in these design activities has been the collaborative involvement of the Design Center personnel and numerous resource physicists from the fusion community who have made significant contributions in the physics design analysis as well as the physics support of the engineering design of the major FED systems and components

Multidimensional nonlinear descriptive analysis

CERN Document Server

Nishisato, Shizuhiko

2006-01-01

Quantification of categorical, or non-numerical, data is a problem that scientists face across a wide range of disciplines. Exploring data analysis in various areas of research, such as the social sciences and biology, Multidimensional Nonlinear Descriptive Analysis presents methods for analyzing categorical data that are not necessarily sampled randomly from a normal population and often involve nonlinear relations. This reference not only provides an overview of multidimensional nonlinear descriptive analysis (MUNDA) of discrete data, it also offers new results in a variety of fields. The first part of the book covers conceptual and technical preliminaries needed to understand the data analysis in subsequent chapters. The next two parts contain applications of MUNDA to diverse data types, with each chapter devoted to one type of categorical data, a brief historical comment, and basic skills peculiar to the data types. The final part examines several problems and then concludes with suggestions for futu...

INTRA/Mod3.2. Manual and code description. Volume 2 - User`s manual

Energy Technology Data Exchange (ETDEWEB)

Andersson, Jenny; Edlund, O.; Hermann, J.; Johansson, Lise-Lotte

1999-01-01

The INTRA Manual consists of two volumes. Volume I of the manual is a thorough description of the code INTRA, the physical modelling of INTRA and the ruling numerics, and volume II, the User`s Manual is an input description. This document, the User`s Manual, Volume II, contains a detailed description of how to use INTRA, how to set up an input file, how to run INTRA and also post-processing

Nivel de conocimiento sobre la especialidad de medicina interna y percepción de los usuarios sobre el rol y capacidades del médico internista

Directory of Open Access Journals (Sweden)

Franco Romaní-Romaní

2009-03-01

Full Text Available Introducción: La especialidad de medicina interna enfrenta muchos retos para permanecer competitiva en el sistema de salud, siendo el escaso conocimiento del público sobre la definición, capacidades y competencias de la medicina interna y del internista uno de esos retos. Objetivos: Determinar cuáles son los conocimientos y la percepción de los pacientes sobre el rol de la medicina interna y del médico internista. Diseño: Estudio transversal, descriptivo y analítico. Lugar: Hospital Nacional Arzobispo Loayza, Hospital Nacional Edgardo Rebagliati y una clínica privada. Participantes: Pacientes adultos que visitaron los servicios de Medicina interna de los tres hospitales. Intervención: Se invitó a llenar un cuestionario anónimo y autoadministrado a los participantes entre el 1 y el 15 de septiembre de 2008. Principales medidas de resultados: Nivel de conocimiento sobre medicina interna e internista, percepción de confianza hacia el internista. Resultados: Quinientos pacientes completaron el cuestionario, 42,8% del Hospital Loayza, 40% del Hospital Rebagliati y 17,2% de una clínica privada. Solo 12,2% alcanzó un buen nivel de conocimiento. El 79% de pacientes tuvo percepción de confianza en el internista para el manejo de síntomas, 50,2% confió en la habilidad clínica del internista y 45,9% confió en el manejo de las enfermedades específicas. Conclusiones: Los pacientes no tienen una definición clara de la medicina interna y el rol del internista. La percepción de confianza es alta con respecto al manejo de los síntomas, pero disminuye al tratarse de enfermedades específicas y de las habilidades clínicas del internista. Por lo tanto, debe realizarse esfuerzos de educación pública para mejorar el entendimiento del rol del internista como especialista en medicina de adultos.

A new theoretical basis for numerical simulations of nonlinear acoustic fields

Science.gov (United States)

Wójcik, Janusz

2000-07-01

Nonlinear acoustic equations can be considerably simplified. The presented model retains the accuracy of a more complex description of nonlinearity and a uniform description of near and far fields (in contrast to the KZK equation). A method has been presented for obtaining solutions of Kuznetsov's equation from the solutions of the model under consideration. Results of numerical calculations, including comparative ones, are presented.

La Evoluci?n de la percepci?n del rol del IRA Provisional a partir de est?mulos generados por el Sistema Internacional

OpenAIRE

Cort?s Rojas, Mar?a Alejandra

2017-01-01

Esta investigaci?n tiene como objetivo explicar los cambios en la forma de lucha, tanto armada como pol?tica, del IRA Provisional a partir del surgimiento de movimientos por los derechos civiles en Estados Unidos, el fin de la Guerra Fr?a y la deslegitimaci?n de los movimientos anti-imperialistas, el auge econ?mico irland?s y la expansi?n de los valores de la Uni?n Europea. Estos cambios pueden verse explicados por la forma en la que el grupo cambia su percepci?n del rol que desarrolla dentro...

A 3-D model of superfluid helium suitable for numerical analysis

CERN Document Server

Darve, C; Van Sciver, S W

2009-01-01

The two-fluid description is a very successful phenomenological representation of the properties of Helium II. A 3-D model suitable for numerical analysis based on the Landau-Khalatnikov description of Helium II is proposed. In this paper we introduce a system of partial differential equations that is both complete and consistent as well as practical, to be used for a 3-D solution of the flow of Helium II. The development of a 3-D numerical model for Helium II is motivated by the need to validate experimental results obtained by observing the normal component velocity distribution in a Helium II thermal counter-flow using the Particle Image Velocimetry (PIV) technique.

From Áustria to Paraná: the images of Hans Kopp trajectory, the first photographer from Rolândia (PR Da Áustria ao Paraná: a trajetória imagética de Hans Kopp, primeiro fotógrafo de Rolândia (PR

Directory of Open Access Journals (Sweden)

Cássia Maria Popolin

2011-08-01

Full Text Available This paper salvages the image trajectory of the first photographer of Rolandia (PR, the Austrian Hans Kopp who came to Brazil after he’s fought in the First World War. He built his life on the North of Paraná, where he registered with photos the birth of the new cities. The paper is a retrospective of Hans Kopp’s life and work, from his birth in 1899, in Austria, to his death in July of 1991, in Rolandia. It proposes a salvage of the memory in the photography and uses it to find out about latent stories about Kopp family and the cities of Rolandia and Londrina. His history and the memory was literally put away in a bottom of a trunk, whose belonged to his decendents. The family’s permission to use their datas was essencial to succeed in the propose of this paper. The methods used were: review of literature, documental search, oral history and photografy analysis. The review of literature was divided into two ways: photography and memory and history of the North of Paraná. The documental search was done with documents available in the history museum of Rolandia and in the Kopp’s family heritage. The oral history was used to do some interviews and the photography analysis to understand better the documents collected during the search. In this way, the line used to guide this paper was works of the researcher Boris Kossoy, with his theoretical and aesthetic studies focused in the photography expression and in the application of the iconographia as a source of historical and social search and the memory conservation. Este trabalho resgata a trajetória imagética do primeiro fotógrafo de Rolândia (PR, o austríaco Hans Kopp, que imigrou para o Brasil depoisde haver combatido na Primeira Guerra Mundial. Fincou raízes no norte do Paraná, onde registrou fotograficamente o despontar das novas cidades. O trabalho faz uma retrospectiva da vida e obra de Hans Kopp, de seu nascimento, em 1899, na Áustria, até sua morte em julho de 1991, em

Circular orbits of corotating binary black holes: Comparison between analytical and numerical results

International Nuclear Information System (INIS)

Damour, Thibault; Gourgoulhon, Eric; Grandclement, Philippe

2002-01-01

We compare recent numerical results, obtained within a 'helical Killing vector' approach, on circular orbits of corotating binary black holes to the analytical predictions made by the effective one-body (EOB) method (which has been recently extended to the case of spinning bodies). On the scale of the differences between the results obtained by different numerical methods, we find good agreement between numerical data and analytical predictions for several invariant functions describing the dynamical properties of circular orbits. This agreement is robust against the post-Newtonian accuracy used for the analytical estimates, as well as under choices of the resummation method for the EOB 'effective potential', and gets better as one uses a higher post-Newtonian accuracy. These findings open the way to a significant 'merging' of analytical and numerical methods, i.e. to matching an EOB-based analytical description of the (early and late) inspiral, up to the beginning of the plunge, to a numerical description of the plunge and merger. We illustrate also the 'flexibility' of the EOB approach, i.e. the possibility of determining some 'best fit' values for the analytical parameters by comparison with numerical data

El rol del director en la escuela: el liderazgo pedagógico y su incidencia sobre el rendimiento académico.

OpenAIRE

Freire, Silvana; Miranda, Alejandra

2014-01-01

A pesar del reconocimiento que la literatura sobre escuelas eficaces y la agenda política actual le otorgan al liderazgo en la dirección y gestión de la escuela, existen pocas investigaciones abocadas a analizar y recoger evidencia empírica sobre la incidencia que tiene el liderazgo pedagógico del director sobre el rendimiento académico de los estudiantes. Este estudio apunta a orientar mejor las acciones políticas de la reforma educativa a través de información clara y precisa sobre el rol d...

Experiment list: SRX186659 [Chip-atlas[Archive

Lifescience Database Archive (English)

Full Text Available 0 || controlid=wgEncodeEH002434 || replicate=1,2 || softwareversion=ScriptureVPap...rol=std || control description=Standard input signal for most experiments. || controlid=Dnd41/Input/std || software

El rol femenino a través de los litigios familiares en el Virreinato del Río de la Plata (siglos XVIII y XIX

Directory of Open Access Journals (Sweden)

Viviana Kluger

2014-06-01

Full Text Available El objeto de este trabajo es analizar el rol femenino en el litigio familiar, a efectos de determinar la presencia de las mujeres a la hora de reclamar el cumplimiento de los deberes y derechos conyugales y paterno filiales en los pleitos entablados en el Virreinato del Río de la Plata. Se trata de medir los ajustes y desajustes, el conformismo y la contradicción entre el modelo propuesto desde la ley y la doctrina, y de contrastar esos esquemas con la praxis judicial. Se presenta primero un análisis del marco legal, para pasar luego al estudio de la asignación de roles familiares, expresada a través de la doctrina canónica y jurídica española de los siglos XVI a XIX, así como de la literatura de la época. Se tratan también el poder de corrección y el deber de subordinación, el rol femenino a través de los litigios familiares, en la defensa del honor y en las alianzas matrimoniales, y se consideran las variaciones según el tiempo, el espacio y la clase social. Por último se exponen unas consideraciones finales acerca de la eventual brecha entre el modelo y la realidad.

Composition en acide alphalinolénique des esters de cholestérol plasmatiques : un marqueur de consommation chez l’homme

Directory of Open Access Journals (Sweden)

Combe Nicole

2002-07-01

Full Text Available Le lien existant entre qualité et quantité des acides gras de l’alimentation, et santé est de plus en plus évident et défini, comme l’indique la revue des travaux plus spécifiquement consacrés aux implications dans le risque de maladies cardiovasculaires (MCV (cf. premier exposé de ce dossier. Néanmoins, si un grand nombre d’études épidémiologiques ou d’intervention ont permis d’aboutir à un consensus qui s’est traduit, en France, par la publication en 2001 des Apports Nutritionnels Conseillés [1], un débat perdure au sein de la communauté scientifique internationale sur les meilleurs apports en acides gras monoinsaturés versus poly-insaturés [2, 3]. Les études récentes de Rudel et al. [4-6] indiquent en effet que des singes nourris avec un régime très enrichi en acide oléique (18:1n-9 : 24% de l’apport énergétique développent une athérosclérose des artères coronaires qui pourrait être en relation avec l’accumulation subséquente d’oléate de cholestérol dans les LDL aux dépens du linoléate de cholestérol. Par ailleurs, eu égard aux effets bénéfiques reconnus à l’acide alphalinolénique (18:3n-3 vis-à-vis des risques d’infarctus du myocarde, de cardiopathie ischémique [7-9] et d’accident vasculaire cérébral [10, 11], le niveau de 18:3n-3 dans les esters de cholestérol (EC du plasma apparaît comme un bon indicateur de protection. En effet, l’étude conduite par Sandker et al. [12], sur deux groupes d’hommes âgés, issus des cohortes crétoises (Seven Countries Study et hollandaises (Zutphen Study, a permis de faire émerger l’intérêt de ce marqueur biologique. En moyenne, le pourcentage de 18:3n-3 mesuré dans les EC plasmatiques des Crétois était significativement plus élevé comparé à celui des Hollandais (0,9% vs 0,32% des acides gras, dont la cohorte présentait un taux de mortalité coronarienne 5 fois plus grand que celui de la cohorte crétoise. En outre, l�

Descriptive catalogue of radioactive waste families

International Nuclear Information System (INIS)

2004-01-01

This document describes the different types of radioactive wastes produced in France or which are expected to be produced in the future. The wastes have been shared into different families having similar characteristics. A description is made for each family: general presentation, photos, position of the family in the French classification, industrial origin, status of production. Some informations about the raw waste and its conditioning process are also given. The qualitative description is completed by some numerical data like: the quantity produced in the past and to be produced in the future, the evaluation of the radioactivity in 2002 and 2020, and the evaluation of the thermal power when it exists. Finally, some informations are given about the risk of toxicity of some chemical species or compounds. (J.S.)

Numerical Modeling of Ablation Heat Transfer

Science.gov (United States)

Ewing, Mark E.; Laker, Travis S.; Walker, David T.

2013-01-01

A unique numerical method has been developed for solving one-dimensional ablation heat transfer problems. This paper provides a comprehensive description of the method, along with detailed derivations of the governing equations. This methodology supports solutions for traditional ablation modeling including such effects as heat transfer, material decomposition, pyrolysis gas permeation and heat exchange, and thermochemical surface erosion. The numerical scheme utilizes a control-volume approach with a variable grid to account for surface movement. This method directly supports implementation of nontraditional models such as material swelling and mechanical erosion, extending capabilities for modeling complex ablation phenomena. Verifications of the numerical implementation are provided using analytical solutions, code comparisons, and the method of manufactured solutions. These verifications are used to demonstrate solution accuracy and proper error convergence rates. A simple demonstration of a mechanical erosion (spallation) model is also provided to illustrate the unique capabilities of the method.

Numerical and experimental investigation of flow and scour around a half-buried sphere

DEFF Research Database (Denmark)

Dixen, Martin; Sumer, B. Mutlu; Fredsøe, Jørgen

2013-01-01

The paper describes the results of a numerical and experimental investigation of flow and scour around a half-buried sphere exposed to a steady current. Hot-film bed shear stress and Laser Doppler Anemometer measurements were made with a half sphere mounted on the smooth bed in an open channel......-buried sphere in currents. The morphologic model includes a sediment-transport description, and a description of surface-layer sand slides for bed slopes exceeding the angle of repose. The sediment transport description includes, for the first time, the effect of externally-generated turbulence (induced...... by the horseshoe-vortex flow and the lee-wake flow processes) on sediment transport. The results show that the scour depth increases and time scale decreases when the effect of externally-generated turbulence is incorporated in the calculations. Empirical expressions representing the numerically obtained data...

Search across Different Media: Numeric Data Sets and Text Files

Directory of Open Access Journals (Sweden)

Michael Buckland

2006-12-01

Full Text Available Digital technology encourages the hope of searching across and between different media forms (text, sound, image, numeric data. Topic searches are described in two different media: text files and socioeconomic numeric databases and also for transverse searching, whereby retrieved text is used to find topically related numeric data and vice versa. Direct transverse searching across different media is impossible. Descriptive metadata provide enabling infrastructure, but usually require mappings between different vocabularies and a search-term recommender system. Statistical association techniques and natural-language processing can help. Searches in socioeconomic numeric databases ordinarily require that place and time be specified.

Crecer cuidando: el rol cuidador en las hijas de madres dependientes

Directory of Open Access Journals (Sweden)

María Gálvez González

2013-12-01

Full Text Available En España, el modelo social de cuidados y atención a personas en estado de dependencia tiene un claro componente familiar. En este ámbito la cuidadora principal es una figura clave, ya que asume la responsabilidad y el complicado cuidado de la persona dependiente. Las cuidadoras familiares deben afrontar una gran cantidad de tareas y decisiones difíciles, lo que las pone en una situación de alta vulnerabilidad, estrés e incertidumbre que merecen especial atención en la asistencia sanitaria. Desde esta perspectiva, se plantea como objetivo de estudio describir el tipo de afrontamiento que realizan las cuidadoras familiares de pacientes en estado de dependencia severa que no presentan sobrecarga en su rol cuidador, tomando como base para ello la comprensión profunda del significado que posee el cuidado natural para estas personas. Para abordar el objetivo de estudio se hizo uso del relato biográfico; en concreto, se siguió la metodología planteada por Amezcua y Hueso. El análisis de datos muestra la toma de decisiones familiar de forma compartida, el mantenimiento de los roles materno-filial y la reciprocidad como elementos integrantes y básicos del cuidado natural. La participante realiza un cuidado singular y humanizado dirigido a las necesidades concretas de su madre, relacionando la historia de vida, el entorno familiar, social y cultural.

Rol de la pareja en el proceso de rehabilitación de personas con discapacidad física por situaciones de guerra

OpenAIRE

Rincón Díaz, Maritza; Restrepo de Giraldo, Lucía

2010-01-01

Objetivo: este artículo estudia el rol de la pareja en el proceso de rehabilitación de uno de sus miembros con lesión medular, producida por herida en actos del servicio como integrante del Ejército de Colombia. Método. se realizó un estudio cualitativo de tipo descriptivo, no estructurado con una única unidad muestral. Se contó con la participación voluntaria de una familia de estrato socioeconómico medio-bajo (esposos y dos hijos). Se evaluaron tres aspectos con base en el modelo sistémico ...

Numerical simulation of electrostatic waves in plasmas

International Nuclear Information System (INIS)

Erz, U.

1981-08-01

In this paper the propagation of electrostatic waves in plasmas and the non-linear interactions, which occur in the case of large wave amplitudes, are studied using a new numerical method for plasma simulation. This mathematical description is based on the Vlasov-model. Changes in the distribution-function are taken into account and thus plasma kinetic effects can be treated. (orig./HT) [de

Noticias y política en diarios sudamericanos. El tratamiento noticioso del rol de UNASUR en Venezuela (marzo de 2014

Directory of Open Access Journals (Sweden)

María Alaniz

2015-10-01

Full Text Available El texto presenta el tratamiento informativo que la prensa escrita realizó en torno al papel de la Unión de Naciones Suramericanas (UNASUR ante el conflicto socio-político venezolano en marzo de 2014. Se caracteriza la UNASUR y su constitución como organismo que fortalece los lazos de integración regional. Luego, se considera el rol de los medios informativos en la visibilización de temas relevantes para la sociedad y la confi-guración de percepciones y sentidos otorgados a los mismos. En este sentido, se analizan los criterios noticiosos de los diarios El Universal (Venezuela, El Tiempo (Colombia, El Comercio (Ecuador y El Peruano (Perú.

The influence of numerical models on determining the drag coefficient

Directory of Open Access Journals (Sweden)

Dobeš Josef

2014-03-01

Full Text Available The paper deals with numerical modelling of body aerodynamic drag coefficient in the transition from laminar to turbulent flow regimes, where the selection of a suitable numerical model is problematic. On the basic problem of flow around a simple body – sphere selected computational models are tested. The values obtained by numerical simulations of drag coefficients of each model are compared with the graph of dependency of the drag coefficient vs. Reynolds number for a sphere. Next the dependency of Strouhal number vs. Reynolds number is evaluated, where the vortex shedding frequency values for given speed are obtained numerically and experimentally and then the values are compared for each numerical model and experiment. The aim is to specify trends for the selection of appropriate numerical model for flow around bodies problem in which the precise description of the flow field around the obstacle is used to define the acoustic noise source. Numerical modelling is performed by finite volume method using CFD code.

ROLE AS A STRATEGY GAMES EDUCATIONAL PERCEPTIONS OF TEACHERS IN TRAINING AND HIGH SCHOOL STUDENTS JUEGOS DE ROL COMO ESTRATEGIA EDUCATIVA: PERCEPCIONES DE DOCENTES EN FORMACIÓN Y ESTUDIANTES DE SECUNDARIA

Directory of Open Access Journals (Sweden)

Víctor Abella García

2010-11-01

Full Text Available p { margin-bottom: 0.21cm; } Mass media have showed a negative image of role playing games in the United States and also in Spain. Murders, suicides and a certain grade of psychosis seems associated with the RPGs, at least on the newspapers. Curiously, these opinions, do not seem to correspond to the scientific investigations realized until now, neither with the legal choices dictated on related cases. This investigation analyzes quantitatively the opinions in a questionnaire of 133 young people.Los medios de comunicación han trasladado una imagen negativa sobre los juegos de rol, tanto en Estados Unidos como en España. Asesinatos, suicidios y un cierto grado de psicosis parecen asociados con los juegos de rol, al menos a tenor de las noticias que suelen aparecer en los medios. Curiosamente, estas opiniones, no parecen corresponderse con las investigaciones científicas realizadas hasta el momento, ni con las sentencias judiciales dictadas sobre casos relacionados. Esta investigación analiza cuantitativamente las opiniones vertidas mediante cuestionario de 133 jóvenes.

Point vortex description of drift wave vortices: Dynamics and transport

International Nuclear Information System (INIS)

Kono, M.; Horton, W.

1991-05-01

Point-vortex description for drift wave vortices is formulated based on the Hasegawa-Mima equation to study elementary processes for the interactions of vortices as well as statistical properties like vortex diffusion. Dynamical properties of drift wave vortices known by numerical experiments are recovered. Furthermore a vortex diffusion model discussed by Horton based on numerical simulations is shown to be analytically obtained. A variety of phenomena arising from the short-range nature of the interaction force of point vortices are suggested. 12 refs., 10 figs

Numerical modelling of concentrated leak erosion during Hole Erosion Tests

OpenAIRE

Mercier, F.; Bonelli, S.; Golay, F.; Anselmet, F.; Philippe, P.; Borghi, R.

2015-01-01

This study focuses on the numerical modelling of concentrated leak erosion of a cohesive soil by a turbulent flow in axisymmetrical geometry, with application to the Hole Erosion Test (HET). The numerical model is based on adaptive remeshing of the water/soil interface to ensure accurate description of the mechanical phenomena occurring near the soil/water interface. The erosion law governing the interface motion is based on two erosion parameters: the critical shear stress and the erosion co...

Numerical ecology with R

CERN Document Server

Borcard, Daniel; Legendre, Pierre

2018-01-01

This new edition of Numerical Ecology with R guides readers through an applied exploration of the major methods of multivariate data analysis, as seen through the eyes of three ecologists. It provides a bridge between a textbook of numerical ecology and the implementation of this discipline in the R language. The book begins by examining some exploratory approaches. It proceeds logically with the construction of the key building blocks of most methods, i.e. association measures and matrices, and then submits example data to three families of approaches: clustering, ordination and canonical ordination. The last two chapters make use of these methods to explore important and contemporary issues in ecology: the analysis of spatial structures and of community diversity. The aims of methods thus range from descriptive to explanatory and predictive and encompass a wide variety of approaches that should provide readers with an extensive toolbox that can address a wide palette of questions arising in contemporary mul...

Numerical Modeling of Shoreline Undulations

DEFF Research Database (Denmark)

Kærgaard, Kasper Hauberg

model has been developed which describes the longshore sediment transport along arbitrarily shaped shorelines. The numerical model is based on a spectral wave model, a depth integrated flow model, a wave-phase resolving sediment transport description and a one-line shoreline model. First the theoretical...... of the feature and under predicts the migration speeds of the features. On the second shoreline, the shoreline model predicts undulations lengths which are longer than the observed undulations. Lastly the thesis considers field measurements of undulations of the bottom bathymetry along an otherwise straight...... length of the shoreline undulations is determined in the linear regime using a shoreline stability analysis based on the numerical model. The analysis shows that the length of the undulations in the linear regime depends on the incoming wave conditions and on the coastal profile. For larger waves...

Numerical Modelling and Measurement in a Test Secondary Settling Tank

DEFF Research Database (Denmark)

Dahl, C.; Larsen, Torben; Petersen, O.

1994-01-01

sludge. Phenomena as free and hindered settling and the Bingham plastic characteristic of activated sludge suspensions are included in the numerical model. Further characterisation and test tank experiments are described. The characterisation experiments were designed to measure calibration parameters...... for model description of settling and density differences. In the test tank experiments, flow velocities and suspended sludge concentrations were measured with different tank inlet geomotry and hydraulic and sludge loads. The test tank experiments provided results for the calibration of the numerical model......A numerical model and measurements of flow and settling in activated sludge suspension is presented. The numerical model is an attempt to describe the complex and interrelated hydraulic and sedimentation phenomena by describing the turbulent flow field and the transport/dispersion of suspended...

Habilidades cognitivas y socioemocionales, y salarios : el rol de las habilidades latentes en la brecha salarial de género en el Perú

OpenAIRE

Velarde, Luciana

2013-01-01

En los últimos años, la literatura ha analizado la relación entre las habilidades cognitivas y no cognitivas y los resultados del mercado laboral. Más aún, se ha estudiado la correlación entre diferencias en estas habilidades y diferencias en salarios entre hombres y mujeres, pero la mayoría de los estudios en torno al tema se han enfocado en países desarrollados. El principal objetivo de este estudio es analizar el rol de las habilidades cognitivas y no cognitivas en la brecha salarial d...

El negocio de la producción de semillas mejoradas y su rol en el proceso de privatización de la agricultura mexicana

OpenAIRE

Gilberto Aboites; Francisco Martínez; Gabriel Torres

1999-01-01

Este artículo rastrea los orígenes de la producción industrial de semillas mejoradas y enfatiza su rol en la privatización de la agricultura mexicana. El argumento establece que la modernización de la agricultura no se puede concebir como una acción homogénea y siempre progresista, como si se hubiera podido decretar de un solo golpe y para siempre, sino que ha sufrido diversos cambios, adecuaciones y retrocesos. En las conclusiones se resalta el alto grado de ...

Funcionamiento familiar y consumo de sustancias en adolescentes: el rol mediador de la autoestima

Directory of Open Access Journals (Sweden)

Teresa I. Jiménez

2008-01-01

Full Text Available En el presente estudio ex post facto se analizan las relaciones directas e indirectas entre el funcionamiento familiar, la autoestima considerada desde una perspectiva multidimensional (autoestima familiar, escolar, social y física y el consumo de sustancias en una muestra de 414 adolescentes. Para el análisis de datos se utilizan matrices de correlaciones bivariadas, el cálculo de ecuaciones estructurales y se sigue el procedimiento de análisis de efectos mediadores. Los resultados muestran que las distintas dimensiones de la autoestima median conjuntamente el 82% de la relación entre el funcionamiento familiar y el consumo de sustancias de los adolescentes. Además, se observa, por un lado, un efecto protector de las autoestimas familiar y escolar frente a la implicación en el consumo de sustancias y, por otro, un efecto de riesgo de las autoestimas social y física. Finalmente, se discute el rol de la autoestima como un mediador para determinadas influencias del contexto familiar y como un recurso psicosocial paradójico en relación con el consumo de sustancias en la edad adolescente.

Seasonal cycle of Martian climate : Experimental data and numerical simulation

NARCIS (Netherlands)

Rodin, A. V.; Willson, R. J.

2006-01-01

The most adequate theoretical method of investigating the present-day Martian climate is numerical simulation based on a model of general circulation of the atmosphere. First and foremost, such models encounter the greatest difficulties in description of aerosols and clouds, which in turn

Orientación al rol de género y uso de tabaco y alcohol en jóvenes de Morelos, México Gender role orientation and tobacco and alcohol use among youth in Morelos, Mexico

Directory of Open Access Journals (Sweden)

Rubén Chávez-Ayala

2013-02-01

Full Text Available OBJETIVO: Cuantificar la asociación entre orientación al rol de género y uso de tabaco y alcohol en jóvenes del estado de Morelos. MATERIAL Y MÉTODOS: Estudio transversal realizado en 2004-2005, en jóvenes de 14 a 24 años (n=1 730. Variables sociodemográficas (zona de residencia, nivel socioeconómico; familiares (educación y violencia paternal; psicosociológicas (rol de género, autoestima, depresión, consumo de alcohol, tabaco, locus de control, abuso sexual. Análisis por regresión logística. RESULTADOS: Factores asociados con uso de tabaco: en mujeres, andrógina, no deseable, machista, intento de abuso sexual y zona urbana. Para hombres, depresión y sumisión. Factores asociados con uso de alcohol: en mujeres, rol masculino, y hombres, edad más de 20 años, vivir en zona semiurbana y urbana y locus interno. CONCLUSIONES: El machismo es una de las orientaciones al rol de género con mayor asociación con el uso de tabaco principalmente en las jóvenes, y la orientación masculina o instrumental se asocia con el alcohol.OBJECTIVE: To quantify the association between gender role orientation and tobacco and alcohol use among young people of the State of Morelos. MATERIALS AND METHODS: Study conducted in 2004-2005, students aged 14 to 24 years (n = 1 730. Sociodemographic variables (area of residence, socioeconomic status, family (parental education and violence, psycho-sociological (gender role, self-esteem, depression, alcohol consumption, tobacco, locus of control, sexual abuse. Logistic regression analysis. RESULTS: Factors associated with use of tobacco: In women, being androgynous undesirable, masculine role, attempted sexual abuse and urban areas. For men, depression and submission. Factors associated with alcohol use: In women, masculine gender role; and in men to be older than 20 years, living in semi-urban and urban area, and internal locus. CONCLUSIONS: The machismo is one of the gender role orientations with greater

Simple Parametric Model for Airfoil Shape Description

Science.gov (United States)

Ziemkiewicz, David

2017-12-01

We show a simple, analytic equation describing a class of two-dimensional shapes well suited for representation of aircraft airfoil profiles. Our goal was to create a description characterized by a small number of parameters with easily understandable meaning, providing a tool to alter the shape with optimization procedures as well as manual tweaks by the designer. The generated shapes are well suited for numerical analysis with 2D flow solving software such as XFOIL.

Neoclassical MHD descriptions of tokamak plasmas

International Nuclear Information System (INIS)

Callen, J.D.; Kim, Y.B.; Sundaram, A.K.

1988-01-01

Considerable progress has been made in extending neoclassical MHD theory and in exploring the linear instabilities, nonlinear behavior and turbulence models it implies for tokamak plasmas. The areas highlighted in this paper include: extension of the neoclassical MHD equations to include temperature-gradient and heat flow effects; the free energy and entropy evolution implied by this more complete description; a proper ballooning mode formalism analysis of the linear instabilities; a new rippling mode type instability; numerical simulation of the linear instabilities which exhibit a smooth transition from resistive ballooning modes at high collisionality to neoclassical MHD modes at low collisionality; numerical simulation of the nonlinear growth of a single helicity tearing mode; and a Direct-Interaction-Approximation model of neoclassical MHD turbulence and the anomalous transport it induces which substantially improves upon previous mixing length model estimates. 34 refs., 2 figs

Rol del óxido nítrico en modelos experimentales propuestos para inducir inflamación gástrica e intestinal en ratas

OpenAIRE

Angulo Herrera, Pedro

2008-01-01

Actualmente se vienen usando varios modelos que utilizan al etanol (EtOH) y la indometacina (Indo) para inducir inflamación gástrica e intestinal en forma experimental. Con el objeto de determinar cuál es el rol del óxido nítrico (NO) en la inflamación gástrica e intestinal, hemos utilizado como donadores de NO al nitrito de sodio (NIT), nitroprusiato de sodio (NPS) y metronidazol (MET); y como inhibidor inespecífico de la sintasa del NO a la NG-nitro-L-arginina-metil éster (LNAME) y el azul ...

Mujer campesina y trabajo. Su rol en la actividad productiva y reproductiva de los Valles Calchaquíes

Directory of Open Access Journals (Sweden)

Graciela F. Torres

2004-01-01

Full Text Available En este artículo se aborda el trabajo femenino en la sociedad campesina del departamento San Carlos, ubicado en los Valles Calchaquíes, en jurisdicción de la provincia de Salta. Se considera la percepción social del rol de la mujer en vinculación al trabajo, y en consecuencia se realiza un inventario de todas las tareas consideradas femeninas, reproductivas y productivas. También se indaga acerca del concepto de trabajo y se analiza su contribución a la supervivencia del grupo doméstico, es decir su importancia como agente económico capaz de obtener y generar ingresos tanto monetarios como en bienes y productos. En la investigación se utilizó metodología cualitativa y las informantes fueron mujeres adultas con un grupo familiar a cargo

Numerically robust geometry engine for compound solid geometries

International Nuclear Information System (INIS)

Vlachoudis, V.; Sinuela-Pastor, D.

2013-01-01

Monte Carlo programs heavily rely on a fast and numerically robust solid geometry engines. However the success of solid modeling, depends on facilities for specifying and editing parameterized models through a user-friendly graphical front-end. Such a user interface has to be fast enough in order to be interactive for 2D and/or 3D displays, but at the same time numerically robust in order to display possible modeling errors at real time that could be critical for the simulation. The graphical user interface Flair for FLUKA currently employs such an engine where special emphasis has been given on being fast and numerically robust. The numerically robustness is achieved by a novel method of estimating the floating precision of the operations, which dynamically adapts all the decision operations accordingly. Moreover a predictive caching mechanism is ensuring that logical errors in the geometry description are found online, without compromising the processing time by checking all regions. (authors)

Urban pavement surface temperature. Comparison of numerical and statistical approach

Science.gov (United States)

Marchetti, Mario; Khalifa, Abderrahmen; Bues, Michel; Bouilloud, Ludovic; Martin, Eric; Chancibaut, Katia

2015-04-01

The forecast of pavement surface temperature is very specific in the context of urban winter maintenance. to manage snow plowing and salting of roads. Such forecast mainly relies on numerical models based on a description of the energy balance between the atmosphere, the buildings and the pavement, with a canyon configuration. Nevertheless, there is a specific need in the physical description and the numerical implementation of the traffic in the energy flux balance. This traffic was originally considered as a constant. Many changes were performed in a numerical model to describe as accurately as possible the traffic effects on this urban energy balance, such as tires friction, pavement-air exchange coefficient, and infrared flux neat balance. Some experiments based on infrared thermography and radiometry were then conducted to quantify the effect fo traffic on urban pavement surface. Based on meteorological data, corresponding pavement temperature forecast were calculated and were compared with fiels measurements. Results indicated a good agreement between the forecast from the numerical model based on this energy balance approach. A complementary forecast approach based on principal component analysis (PCA) and partial least-square regression (PLS) was also developed, with data from thermal mapping usng infrared radiometry. The forecast of pavement surface temperature with air temperature was obtained in the specific case of urban configurtation, and considering traffic into measurements used for the statistical analysis. A comparison between results from the numerical model based on energy balance, and PCA/PLS was then conducted, indicating the advantages and limits of each approach.

Numerical modelling of erosion and sedimentation around offshore pipelines

NARCIS (Netherlands)

van Beek, F.A.; Wind, H.G.

1990-01-01

In this paper a numerical model is presented for the description of the erosion and sedimentation near pipelines on the sea bottom. The model is based on the Navier-Stokes equations and the equation of motion and continuity of sediment. The results of the simulations have been compared with the

Rol moderador de Core Self Evaluations sobre Apoyo Social Percibido y distrés psicológico en población desempleada

OpenAIRE

Peláez-Fernández, María de los Ángeles; Extremera, Natalio; Rey, Lourdes

2014-01-01

Propósito: El propósito de esta investigación fue estudiar el rol moderador de la variable Core Self Evaluations (CSE; Evaluaciones sobre uno mismo) en la relación entre Apoyo Social Percibido (ASP) y dimensiones DASS (Distrés psicológico: Estrés, Ansiedad y Depresión) en población desempleada de Málaga. Marco teórico y justificación: El desempleo es un factor asociado al incremento de estrés, ansiedad y depresión. Existe evidencia de relación negativa entre CSE e indicadores de distrés p...

Experiment list: SRX142519 [Chip-atlas[Archive

Lifescience Database Archive (English)

Full Text Available rol description=This data represents a control being compared to experiments using read length of 32 bp || t...cription=This data represents a control being compared to experiments using read length of 32 bp || controli

Rol del estado en los ensayos clínicos

Directory of Open Access Journals (Sweden)

Pilar Mazzetti

Full Text Available La regulación de los ensayos clínicos por el Estado es un proceso en constante cambio y adecuación, cuyo reto actual consiste en salvaguardar la seguridad de los participantes y equilibrar la carga administrativa. El desarrollo y la regulación de los ensayos clínicos en los distintos países varían según la realidad, el contexto, su ejecución nacional o multinacional, condicionando que la regulación puramente nacional resulte insuficiente y se precise conocer parte de la regulación internacional. El objetivo de esta publicación es mostrar una visión global del rol de Estado en la regulación de los ensayos clínicos en distintas realidades. Para ello, se ha realizado una revisión de la regulación en la Unión Europea, Estados Unidos de Norteamérica y algunos países de Latinoamérica, para llegar finalmente al Perú. La tendencia actual en la regulación de los ensayos clínicos, se caracteriza por el incremento en los estándares de calidad, el garantizar la seguridad de los participantes, promover la transparencia, la disminución de los procesos burocráticos y el fortalecimiento de los comités de ética, en el marco de procesos democráticos abiertos, que convoquen e integren a todos los interesados en procesos dinámicos basados en el conocimiento actual y los cambios que se suceden. El reto actual es promover el desarrollo de ensayos clínicos desde el Estado (universidades, centros de investigación, institutos especializados, hospitales, etc. para los aspectos que el país necesita, incluidos medicamentos huérfanos, enfermedades prevalentes y abandonadas, y el uso terapéutico de los principios activos originarios.

Rol del estado en los ensayos clínicos

Directory of Open Access Journals (Sweden)

Pilar Mazzetti

2012-12-01

Full Text Available La regulación de los ensayos clínicos por el Estado es un proceso en constante cambio y adecuación, cuyo reto actual consiste en salvaguardar la seguridad de los participantes y equilibrar la carga administrativa. El desarrollo y la regulación de los ensayos clínicos en los distintos países varían según la realidad, el contexto, su ejecución nacional o multinacional, condicionando que la regulación puramente nacional resulte insuficiente y se precise conocer parte de la regulación internacional. El objetivo de esta publicación es mostrar una visión global del rol de Estado en la regulación de los ensayos clínicos en distintas realidades. Para ello, se ha realizado una revisión de la regulación en la Unión Europea, Estados Unidos de Norteamérica y algunos países de Latinoamérica, para llegar finalmente al Perú. La tendencia actual en la regulación de los ensayos clínicos, se caracteriza por el incremento en los estándares de calidad, el garantizar la seguridad de los participantes, promover la transparencia, la disminución de los procesos burocráticos y el fortalecimiento de los comités de ética, en el marco de procesos democráticos abiertos, que convoquen e integren a todos los interesados en procesos dinámicos basados en el conocimiento actual y los cambios que se suceden. El reto actual es promover el desarrollo de ensayos clínicos desde el Estado (universidades, centros de investigación, institutos especializados, hospitales, etc. para los aspectos que el país necesita, incluidos medicamentos huérfanos, enfermedades prevalentes y abandonadas, y el uso terapéutico de los principios activos originarios.

Cambios en el rol social del paciente oncohematológico: un estudio de caso Changes in the oncohematologic patient's social role: a case study

Directory of Open Access Journals (Sweden)

David Nondedeu Arráez

2011-09-01

Full Text Available El tratamiento habitual de las enfermedades oncohematológicas consta de tratamiento específico de quimioterapia, así como tratamiento de soporte para evitar o paliar los efectos secundarios. Dentro de este tratamiento de soporte se incluyen medidas preventivas derivadas de la inmunodepresión medular como la modificación de la alimentación y el aislamiento. En este estudio de caso describimos cómo afectan todas estas medidas terapéuticas y de soporte en el rol social de un paciente afectado de leucemia mieloide aguda. Los datos cualitativos procedentes del paciente fueron obtenidos mediante una entrevista semiestructurada, transcritos a papel y analizados y agrupados según las dimensiones familiar, laboral, social y emocional. Los resultados indican que existe una ruptura y un cambio en el rol social del paciente, así como un cambio en su estatus emocional.The usual treatment of oncohematological diseases consists of specific treatment chemotherapy and supportive care to prevent or mitigate the secondary effects. Within this supportive treatment includes pre-ventive measures resulting from bone marrow immunosuppression as dietary changes and isolation. In this case study we describe how these therapeutic and support measures affect in the social role of a patient suffering from acute myeloid leukemia. Qualitative data from the patient were obtained through a semistructured interview, transcribed to paper and analyzed and grouped according to family size, employment, social and emotional development. The results indicate a break and a change in the patient's social role and a change in emotional status.

Theoretical description and numerical calculations of significant three-dimensional magnetic field configurations

Energy Technology Data Exchange (ETDEWEB)

Mierau, Anna; Weiland, Thomas [Technische Universitaet Darmstadt (DE). Institut fuer Theorie Elektromagnetischer Felder (TEMF); Schnizer, Pierre; Fischer, Egbert [GSI Helmholtzzentrum fuer Schwerionenforschung GmbH, Darmstadt (Germany); Akishin, Pavel [JINR, Dubna (Russian Federation)

2010-07-01

The heavy ion synchrotron SIS100, the core component of the Facility of Antiproton and Ion Research will accelerate high current ion beams of up to U{sup 27+}. For operating such a machine the static and transient magnetic field quality must be fully understood. This is also necessary to keep the beam losses well below acceptable limits and to prepare a sound strategy for high resolution magnetic measurements and data analysis. Challenging preconditions to perform such work are to find a proper description for the non. Cartesian symmetry of the magnets, most important for curved dipoles with elliptical apertures. We describe the parameterisation methods using elliptic and toroidal multipoles and summarise comparing the calculated to the measured field quality.

El rol de la depresión en el déficit cognitivo del paciente con síndrome de fatiga crónica

OpenAIRE

Santamarina-Pérez, P.; Freniche, V.; Eiroá Orosa, Francisco José; Llobet, G.; Sáez, N.; Alegre Martín, José; Jacas, C.

2011-01-01

Fundamento y objetivo Analizar el rol de la depresión en el déficit cognitivo del paciente con síndrome de fatiga crónica (SFC). Pacientes y método Un total de 57 mujeres con diagnóstico de SFC fueron evaluadas mediante tests neuropsicológicos que incluían medidas de atención (CalCap, Control Mental del WMS-III, PASAT, dígitos directos e inversos del WAIS-III y symbol digit modalities test [SDMT]) funciones ejecutivas (test Stroop, Trail Making Test [TMT A y B], FAS y Torre de Londres), memor...

Numerical study of propagation effects in a wireless mesh test bed

CSIR Research Space (South Africa)

Lysko, AA

2008-07-01

Full Text Available The present layout of the indoor wireless mesh network test-bed build at the Meraka Institute is introduced. This is followed by a description of a numerical electromagnetic model for the complete test-bed, including the coupling and diffraction...

Probabilistic Description of a Clay Site using CPTU tests

DEFF Research Database (Denmark)

Andersen, Sarah; Lauridsen, Kristoffer; Nielsen, Benjaminn Nordahl

2012-01-01

A clay site at the harbour of Aarhus, where numerous cone penetration tests have been conducted, is assessed. The upper part of the soil deposit is disregarded, and only the clay sections are investigated. The thickness of the clay deposit varies from 5 to 6 meters, and is sliced into sections of...... a geotechnical assessment of a site, using both the method for classifying soil behaviour types and applying statistics, yield a new level of information, and certainty about the estimates of the strength parameters which are the important outcome of such a site description.......A clay site at the harbour of Aarhus, where numerous cone penetration tests have been conducted, is assessed. The upper part of the soil deposit is disregarded, and only the clay sections are investigated. The thickness of the clay deposit varies from 5 to 6 meters, and is sliced into sections of 1...... meter in thickness. For each slice, a map of the variation of the undrained shear strength is created through Kriging and the probability of finding weak zones in the deposit is calculated. This results in a description of the spatial variation of the undrained shear strength at the site. Making...

Numerical studies of fermionic field theories at large-N

International Nuclear Information System (INIS)

Dickens, T.A.

1987-01-01

A description of an algorithm, which may be used to study large-N theories with or without fermions, is presented. As an initial test of the method, the spectrum of continuum QCD in 1 + 1 dimensions is determined and compared to previously obtained results. Exact solutions of 1 + 1 dimensional lattice versions of the free fermion theory, the Gross-Neveu model, and QCD are obtained. Comparison of these exact results with results from the numerical algorithm is used to test the algorithms, and more importantly, to determine the errors incurred from the approximations used in the numerical technique. Numerical studies of the above three lattice theories in higher dimensions are also presented. The results are again compared to exact solutions for free fermions and the Gross-Neveu model; perturbation theory is used to derive expansions with which the numerical results for QCD may be compared. The numerical algorithm may also be used to study the euclidean formulation of lattice gauge theories. Results for 1 + 1 dimensional euclidean lattice QCD are compared to the exact solution of this model

Los poetas se negaron a morir: el rol de la autoría en la comunicación literaria

Directory of Open Access Journals (Sweden)

Erasto Antonio Espino Barahona

2002-01-01

Full Text Available La producción y comprensión del texto literario supone una particular comunicación entre dos sujetos: el autor y el lector. En la misma se ponen en juego problemas humanos fundamentales como lo son la cuestión del otro y del sentido: ¿Para qué escribimos? ¿La labor escritural y lectora puede y debe ayudarnos en nuestra búsqueda de sentido? ¿Cuándo leo, puedo prescindir de la comunicación con ese otro que es el autor y buscarme sólo a mí mismo? El texto intenta responder a estas y otras interrogantes, tomando una distancia crítica frente a algunas posturas teóricas que al explicar la comunicación literaria, minusvaloran la función semiótica del rol del autor.

Rol de la Ortodoncia y la Ortopedia en el tratamiento de pacientes con traumatismos a nivel dentoalveolar. Reporte de casos

Directory of Open Access Journals (Sweden)

Grassi-A

2014-01-01

Full Text Available Se presentan 2 casos clínicos de pacientes con traumatismos dentarios que avalan la importancia de un abordaje multidisciplinario a fin de optimizar su resolución. Se resalta el rol del ortodoncista y el ortopedista dento-máxilo-facial en la prevención, atención adecuada de las diferentes situaciones que pueden presentarse en el transcurso de un traumatismo, y rehabilitación en las diferentes etapas de la dentición, optimizando resultados mediante una fluida interrelación con otros profesionales. Se enfatiza la importancia de que, en la etapa diagnóstica y de planificación de los tratamientos, el profesional sea capaz de detectar secuelas de posibles traumatismos, que de pasar inadvertidos pueden complicar la resolución del caso

A numerical calculation method of environmental impacts for the deep sea mining industry - a review.

Science.gov (United States)

Ma, Wenbin; van Rhee, Cees; Schott, Dingena

2018-03-01

Since the gradual decrease of mineral resources on-land, deep sea mining (DSM) is becoming an urgent and important emerging activity in the world. However, until now there has been no commercial scale DSM project in progress. Together with the reasons of technological feasibility and economic profitability, the environmental impact is one of the major parameters hindering its industrialization. Most of the DSM environmental impact research focuses on only one particular aspect ignoring that all the DSM environmental impacts are related to each other. The objective of this work is to propose a framework for the numerical calculation methods of the integrated DSM environmental impacts through a literature review. This paper covers three parts: (i) definition and importance description of different DSM environmental impacts; (ii) description of the existing numerical calculation methods for different environmental impacts; (iii) selection of a numerical calculation method based on the selected criteria. The research conducted in this paper provides a clear numerical calculation framework for DSM environmental impact and could be helpful to speed up the industrialization process of the DSM industry.

A numerical library in Java for scientists and engineers

CERN Document Server

Lau, Hang T

2003-01-01

At last researchers have an inexpensive library of Java-based numeric procedures for use in scientific computation. The first and only book of its kind, A Numeric Library in Java for Scientists and Engineers is a translation into Java of the library NUMAL (NUMerical procedures in ALgol 60). This groundbreaking text presents procedural descriptions for linear algebra, ordinary and partial differential equations, optimization, parameter estimation, mathematical physics, and other tools that are indispensable to any dynamic research group. The book offers test programs that allow researchers to execute the examples provided; users are free to construct their own tests and apply the numeric procedures to them in order to observe a successful computation or simulate failure. The entry for each procedure is logically presented, with name, usage parameters, and Java code included. This handbook serves as a powerful research tool, enabling the performance of critical computations in Java. It stands as a cost-effi...

The Subsystem of Numerals in Catalan Sign Language: Description and Examples from a Psycholinguistic Study

Science.gov (United States)

Fuentes, Mariana; Tolchinsky, Liliana

2004-01-01

Linguistic descriptions of sign languages are important to the recognition of their linguistic status. These languages are an essential part of the cultural heritage of the communities that create and use them and vital in the education of deaf children. They are also the reference point in language acquisition studies. Ours is exploratory…

El rol del psicólogo en las instituciones: una lectura clínica en articulación con la ética profesional y la responsabilidad

OpenAIRE

López, Giselle A.

2011-01-01

El presente artículo se inscribe en el marco del proyecto de investigación UBACyT Cuestiones éticas de la psicología en el ámbito jurídico y otros contextos institucionales. Estudio exploratorio descriptivo en base a una investigación cuali- cuantitativa. (Programación científica 2010-2012. Directora: Prof. Gabriela Z. Salomone). En esta ocasión indagaremos acerca del rol del psicólogo en las instituciones, en especial en el caso de algunos dispositivos públicos y gratuitos. Para ello, analiz...

PERCEPCION DE INSEGURIDAD LABORAL Y SU RELACION CON CONDUCTAS DE CIUDADANIA CORPORATIVA Y DESEMPELO ASOCIADO AL ROL: UNA EVALUACION DE FACTORES MODERADORES Y MEDIADORES EN TRABAJADORES

OpenAIRE

LOPEZ BOHLE, SERGIO ANDRES

2014-01-01

El propósito de la investigación es evaluar la relación entre la percepción de inseguridad laboral y el desempeño asociado al rol, las conductas de ciudadanía corporativa dirigidas a la organización y las conductas de ciudadanía corporativa dirigidas a los individuos, considerando los efectos moderadores de la atribución de justicia en los procedimientos y la percepción de apoyo del supervisor, y el efecto de la brecha del contrato psicológico como variable mediadora. La muestr...

Numerical schemes for the hybrid modeling approach of gas-particle turbulent flows

International Nuclear Information System (INIS)

Dorogan, K.

2012-01-01

Hybrid Moments/PDF methods have shown to be well suitable for the description of poly-dispersed turbulent two-phase flows in non-equilibrium which are encountered in some industrial situations involving chemical reactions, combustion or sprays. They allow to obtain a fine enough physical description of the poly-dispersity, non-linear source terms and convection phenomena. However, their approximations are noised with the statistical error, which in several situations may be a source of a bias. An alternative hybrid Moments-Moments/PDF approach examined in this work consists in coupling the Moments and the PDF descriptions, within the description of the dispersed phase itself. This hybrid method could reduce the statistical error and remove the bias. However, such a coupling is not straightforward in practice and requires the development of accurate and stable numerical schemes. The approaches introduced in this work rely on the combined use of the up-winding and relaxation-type techniques. They allow to obtain stable unsteady approximations for a system of partial differential equations containing non-smooth external data which are provided by the PDF part of the model. A comparison of the results obtained using the present method with those of the 'classical' hybrid approach is presented in terms of the numerical errors for a case of a co-current gas-particle wall jet. (author)

From Matched Spatial Filtering towards the Fused Statistical Descriptive Regularization Method for Enhanced Radar Imaging

Directory of Open Access Journals (Sweden)

Shkvarko Yuriy

2006-01-01

Full Text Available We address a new approach to solve the ill-posed nonlinear inverse problem of high-resolution numerical reconstruction of the spatial spectrum pattern (SSP of the backscattered wavefield sources distributed over the remotely sensed scene. An array or synthesized array radar (SAR that employs digital data signal processing is considered. By exploiting the idea of combining the statistical minimum risk estimation paradigm with numerical descriptive regularization techniques, we address a new fused statistical descriptive regularization (SDR strategy for enhanced radar imaging. Pursuing such an approach, we establish a family of the SDR-related SSP estimators, that encompass a manifold of existing beamforming techniques ranging from traditional matched filter to robust and adaptive spatial filtering, and minimum variance methods.

Wind conditions in urban layout - Numerical and experimental research

Science.gov (United States)

Poćwierz, Marta; Zielonko-Jung, Katarzyna

2018-01-01

This paper presents research which compares the numerical and the experimental results for different cases of airflow around a few urban layouts. The study is concerned mostly with the analysis of parameters, such as pressure and velocity fields, which are essential in the building industry. Numerical simulations have been performed by the commercial software Fluent, with the use of a few different turbulence models, including popular k-ɛ, k-ɛ realizable or k-ω. A particular attention has been paid to accurate description of the conditions on the inlet and the selection of suitable computing grid. The pressure measurement near buildings and oil visualization were undertaken and described accordingly.

Trabajando con tecnologías y afrontando el tecnoestrés: el rol de las creencias de eficacia

Directory of Open Access Journals (Sweden)

MARISA SALANOVA SORIA

2003-01-01

Full Text Available El objetivo del presente trabajo es describir qué es y cómo se produce el proceso de tecnoestrés en el marco mas global del 'Modelo Demandas-Recursos', con especial énfasis en describir los principales resultados de la investigación reciente sobre el rol amortiguador que tienen las creencias de eficacia en todo este proceso. Para ello se revisa en primer lugar el concepto de tecnoestrés ofreciendo una definición comprehensiva del constructo. En segundo lugar, se contextualiza el tecnoestrés en el marco más global de los Modelos Demandas- Recursos, apuntando los principales hallazgos en la investigación sobre las características del trabajo con Tecnologías de la Información y Comunicación (TIC. El artículo finaliza revisando la investigación reciente sobre la autoeficacia como un recurso 'amortiguador' del proceso de tecnoestrés.

EnROL: A multicentre randomised trial of conventional versus laparoscopic surgery for colorectal cancer within an enhanced recovery programme

Directory of Open Access Journals (Sweden)

Kennedy Robin H

2012-05-01

Full Text Available Abstract Background During the last two decades the use of laparoscopic resection and a multimodal approach known as an enhanced recovery programme, have been major changes in colorectal perioperative care. Clinical outcome improves using laparoscopic surgery to resect colorectal cancer but until recently no multicentre trial evidence had been reported regarding whether the benefits of laparoscopy still exist when open surgery is optimized within an enhanced recovery programme. The EnROL trial (Enhanced Recovery Open versus Laparoscopic examines the hypothesis that laparoscopic surgery within an enhanced recovery programme will provide superior postoperative outcomes when compared to conventional open resection of colorectal cancer within the same programme. Methods/design EnROL is a phase III, multicentre, randomised trial of laparoscopic versus open resection of colon and rectal cancer with blinding of patients and outcome observers to the treatment allocation for the first 7 days post-operatively, or until discharge if earlier. 202 patients will be recruited at approximately 12 UK hospitals and randomised using minimization at a central computer system in a 1:1 ratio. Recruiting surgeons will previously have performed >100 laparoscopic colorectal resections and >50 open total mesorectal excisions to minimize conversion. Eligible patients are those suitable for elective resection using either technique. Excluded patients include: those with acute intestinal obstruction and patients in whom conversion from laparoscopic to open procedure is likely. The primary outcome is physical fatigue as measured by the physical fatigue domain of the multidimensional fatigue inventory 20 (MFI-20 with secondary outcomes including postoperative hospital stay; complications; reoperation and readmission; quality of life indicators; cosmetic assessments; standardized performance indicators; health economic analysis; the other four domains of the MFI-20

Description of deformed nuclei in the sdg boson model

Energy Technology Data Exchange (ETDEWEB)

Li, S.C. [Australian National Univ., Canberra, ACT (Australia). Research School of Physical Sciences; Kuyucak, S. [Australian National Univ., Canberra, ACT (Australia). Research School of Physical Sciences

1996-07-15

We present a study of deformed nuclei in the framework of the sdg interacting boson model utilizing both numerical diagonalization and analytical 1/N expansion techniques. The focus is on the description of high-spin states which have recently become computationally accessible through the use of computer algebra in the 1/N expansion formalism. A systematic study is made of high-spin states in rare-earth and actinide nuclei. (orig.).

Description of deformed nuclei in the sdg boson model

Science.gov (United States)

Li, S. C.; Kuyucak, S.

1996-02-01

We present a study of deformed nuclei in the framework of the sdg interacting boson model utilizing both numerical diagonalization and analytical {1}/{N} expansion techniques. The focus is on the description of high-spin states which have recently become computationally accessible through the use of computer algebra in the {1}/{N} expansion formalism. A systematic study is made of high-spin states in rare-earth and actinide nuclei.

Description of deformed nuclei in the sdg boson model

International Nuclear Information System (INIS)

Li, S.C.; Kuyucak, S.

1996-01-01

We present a study of deformed nuclei in the framework of the sdg interacting boson model utilizing both numerical diagonalization and analytical 1/N expansion techniques. The focus is on the description of high-spin states which have recently become computationally accessible through the use of computer algebra in the 1/N expansion formalism. A systematic study is made of high-spin states in rare-earth and actinide nuclei. (orig.)

Konsantre Yoğurt Jelinin Oluşumunda Etkili Faktörler II. Hidrofobik ve İyonik İnteraksiyonların Rolü

Directory of Open Access Journals (Sweden)

Barbaros H. Özer

2015-02-01

Full Text Available Bu çalışmada, hidrofobik ve iyonik interaksiyonların koyulaştırılmış yoğurt jellerinin fiziksel özellikleri üzerindeki rolü araştırılmıştır. Konsantre yoğurt üretiminde, ultrafiltrasyon (UF, reverse osmosis (RO ve direk rekonstitüsyon (DR teknikleri kullanılmıştır. Yoğurtların fiziksel özellikleri bir dinamik reometre aracılığı ile ölçülmüştür. Reometrenin çalışma parametreleri 1.5x10-2-1.5x10-1 mNm ve frekansı 0.25 Hz olarak kalibre edilmiştir. Farklı kurumadde artırım tekniklerinin süt proteinlerinde yarattığı değişimler ise doğal-poliakrilamid jel elektroforez ile incelenmiştir. Sonuçlara göre, hidrofobik interaksiyonların en az kovalent bağlar kadar yoğurt jelinin oluşumunda etkin rol oynadığı saptanmıştır. 2 oC’de glucono-delta-lactone ile asitlendirilen yoğurtlarda pıhtının son derece zayıf olduğu ve proteinler arası interaksiyonların tamamlanmadığı gözlenmiştir. Buna karşın, CaCl2 katımı UF-yoğurt dışında tüm örneklerde herhangi bir fiziksel değişime neden olmamıştır. Ancak, UF-yoğurtta CaCl2 konsantrasyonuna bağlı olarak dereceli bir düşüş saptanmıştır.

El rol del profesor y el software geogebra: experiencia de aula bajo la teoría de la mediación semiótica

OpenAIRE

Mejía, Cristina; Molina, Óscar

2013-01-01

En este artículo se presenta parte del trabajo de grado que estoy desarrollando para optar por el título de maestría en Docencia de las Matemáticas. Específicamente, se recuentan detalles de una experiencia de aula en la que el objetivo es formular una conjetura en la clase de geometría con estudiantes de grado octavo, y a partir de tal recuento se realiza un análisis parcial del rol del profesor, bajo el modelo de la Mediación Semiótica. Dicha experiencia está centrada en el uso de un softwa...

Free Software Development. 3. Numerical Description of Soft Acid with Soft Base Titration

OpenAIRE

Lorentz JÄNTSCHI; Horea Iustin NAŞCU

2002-01-01

The analytical methods of qualitative and quantitative determination of ions in solutions are very flexible to automation. The present work is focus on modeling the process of titration and presents a numerical simulation of acid-base titration. A PHP program to compute all iterations in titration process that solves a 3th rank equation to find value of pH for was built and is available through http internet protocol at the address: http://vl.academicdirect.org/molecular_dynamics/ab_titra...

La integración petrolera en América Latina: el rol de ARPEL como comunidad epistémica

Directory of Open Access Journals (Sweden)

Susana Yazbek

2013-01-01

Full Text Available El propósito de este trabajo es analizar el rol que desempeñó ARPEL en el proceso de integración regio- nal del sector petrolero en América Latina. A partir del concepto de “comunidades epistémicas”, exa- minaremos la historia de ARPEL desde 1965 hasta el año 2000. Inicialmente ARPEL -Asistencia Recípro- ca Petrolera Estatal Latinoamericana- reunía a las empresas petroleras estatales cuando fue fundada en 1965, luego, en la década de 1990, completó su transformación y fue incorporando entre sus miembros a empresas privadas y cambió su denominación -en 1993: Asistencia Recíproca Petrolera Empresarial Latinoamericana, y en 1998: Asociación Regional de Empresas de Petróleo y Gas Natural en Latinoa- mérica y el Caribe-.

Deterioro y conservación de los bosques del Nevado de Toluca y el rol de los actores locales

Directory of Open Access Journals (Sweden)

Ángel Rolando Endara Agramont

2016-01-01

Full Text Available El Área de Protección de Flora y Fauna Nevado de Toluca presenta una constante fragmentación de sus bosques. El objetivo de la investigación fue identificar los procesos de deterioro de sus bosques y el rol de los actores locales en su conservación. Se utilizaron los sistemas de información geográfica como base para la generación de mapas temáticos, además de la aplicación de un diagrama de flujo que define los problemas del bosque y otro que los describe y analiza para la búsqueda de soluciones. Los resultados muestran que los principales factores que inciden en el deterioro son incendios forestales, tala inmoderada, plagas y enfermedades. Finalmente se plantean estrategias y escenarios de manejo de los bosques a partir de la articulación de los actores locales.

A new general purpose event horizon finder for 3D numerical spacetimes

International Nuclear Information System (INIS)

Diener, Peter

2003-01-01

I present a new general purpose event horizon finder for full 3D numerical spacetimes. It works by evolving a complete null surface backwards in time. The null surface is described as the zero-level set of a scalar function, which in principle is defined everywhere. This description of the surface allows the surface, trivially, to change topology, making this event horizon finder able to handle numerical spacetimes where two (or more) black holes merge into a single final black hole

Estudio del rol de la proteína VMP1 en los procesos de autofagia, muerte y sobrevida celular en la fisiopatología pancreática

OpenAIRE

Pardo, Romina Paola

2010-01-01

La autofagia es un proceso de degradación de componentes citoplasmáticos que en algunos casos puede jugar un rol citoprotectivo, mientras que en otros puede llevar a la muerte celular. En trabajos previos hemos descripto a la proteína transmembrana VMP1, la cual se encuentra inducida en la pancreatitis experimental. Con el objetivo de determinar su función, se estudió su participación en el proceso de autofagia. Los resultados obtenidos en esta tesis demostraron que la sobreexpresión de VMP1 ...

El rol del maestro frente a la construcción del juego simbólico en los niños

Directory of Open Access Journals (Sweden)

María Eugenia Villalobos

2009-01-01

Full Text Available En el presente artículo se muestran tres formas de juego espontáneo llevadas a cabo por los niños en preescolar y primero de primaria, que orientan el marco de referencia. Se busca mostrar los elementos comprensivos de los que puede disponer el maestro para ofrecer a los niños posibilidades de transformar las experiencias de juegos estereotipados, llamados juego -juguete-, en juego simbólico. La observación y análisis de las actividades de los niños muestra cómo ellos organizan nuevas representaciones a partir de los nuevos significados que otorgan a sus experiencias. Frente a estos procesos de los niños, el maestro tiene un rol primordial para favorecer las experiencias de significación que sustentan los procesos de aprendizaje

Representaciones sociales del rol orientador del docente en estudiantes de educación

Directory of Open Access Journals (Sweden)

María Susana Campo-Redondo

2009-01-01

Full Text Available Este estudio tuvo como objetivo identificar y analizar las representaciones sociales que tienen los estudiantes de la Escuela de Educación de la Facultad de Humanidades y Educación de la Universidad del Zulia (LUZ, sobre las funciones orientadoras del ejercicio docente. El estudio fue de campo a nivel descriptivo y desde un enfoque cualitativo. La recolección de la información fue mediante la aplicación entrevistas a profundidad a 10 estudiantes de educación de las menciones de Educación Física, Deportes y Recreación (4, Matemática y Física (4 y Biología (2 además del análisis de exámenes escritos de la asignatura "Psicología Educativa" de la mención de matemáticas. El análisis de las informaciones recabadas se realizó mediante la Teoría Fundamentada. Como resultados, se determinó que los estudiantes participantes, tienen una representación del docente con un gran componente de ayuda, caracterizado por la escucha efectiva y el interés por sus alumnos expresado en: la paternalidad, la amistad y el compañerismo, además es un líder que impacta a sus estudiantes y posee una imagen fundamentada en su rol docente y su formación profesional. Por último se proponen algunas recomendaciones en cuanto a la formación de docentes.

Validation of numerical model of a liquid flow in a tundish by laboratory measurements

Directory of Open Access Journals (Sweden)

T. Merder

2014-07-01

Full Text Available The article presents results of physical and numerical modelling of steel flow through a tundish of continuous casting machine. In numerical calculations the influence of mesh density was tested and the correctness of the flow description in the near-wall region was checked using Standard Wall Function model. Obtained results were verified using experimental results of velocity field (PIV method coming from a water tundish model.

El Rol de la Comunicacion en la Co-Construcción de Conocimiento y de Redes de Vinculación y Transferencia en Nanotecnología

OpenAIRE

Perez , Constanza; Vinck , Dominique

2008-01-01

International audience; El propósito de este trabajo es responder la pregunta:¿Cuál es el rol de los procesos de comunicación en lagestión de conocimiento en nanotecnología? El acercamiento a esta indagación se realiza desde la noción de redes de vinculación y transferencia. Se estudian, desde la perspectiva de actor red, cuatro casos de producción de conocimiento científico y tecnológico en nanotecnología. La estrategia metodológica adoptada es el seguimiento de los actores humanos y no huma...

Waste receiving and processing plant control system; system design description

Energy Technology Data Exchange (ETDEWEB)

LANE, M.P.

1999-02-24

The Plant Control System (PCS) is a heterogeneous computer system composed of numerous sub-systems. The PCS represents every major computer system that is used to support operation of the Waste Receiving and Processing (WRAP) facility. This document, the System Design Description (PCS SDD), includes several chapters and appendices. Each chapter is devoted to a separate PCS sub-system. Typically, each chapter includes an overview description of the system, a list of associated documents related to operation of that system, and a detailed description of relevant system features. Each appendice provides configuration information for selected PCS sub-systems. The appendices are designed as separate sections to assist in maintaining this document due to frequent changes in system configurations. This document is intended to serve as the primary reference for configuration of PCS computer systems. The use of this document is further described in the WRAP System Configuration Management Plan, WMH-350, Section 4.1.

Waste receiving and processing plant control system; system design description

International Nuclear Information System (INIS)

LANE, M.P.

1999-01-01

The Plant Control System (PCS) is a heterogeneous computer system composed of numerous sub-systems. The PCS represents every major computer system that is used to support operation of the Waste Receiving and Processing (WRAP) facility. This document, the System Design Description (PCS SDD), includes several chapters and appendices. Each chapter is devoted to a separate PCS sub-system. Typically, each chapter includes an overview description of the system, a list of associated documents related to operation of that system, and a detailed description of relevant system features. Each appendice provides configuration information for selected PCS sub-systems. The appendices are designed as separate sections to assist in maintaining this document due to frequent changes in system configurations. This document is intended to serve as the primary reference for configuration of PCS computer systems. The use of this document is further described in the WRAP System Configuration Management Plan, WMH-350, Section 4.1

Practical considerations in developing numerical simulators for thermal recovery

Energy Technology Data Exchange (ETDEWEB)

Abou-Kassem, J.H. [Chemical and Petroleum Engineering Department, UAE University, Al-Ain (United Arab Emirates)

1996-08-15

Numerical simulation of steam injection and in-situ combustion-based oil recovery processes is of great importance in project design. Development of such numerical simulators is an on-going process, with improvements made as the process description becomes more complete, and also as better methods are devised to resolve certain numerical difficulties. This paper addresses some of the latter, and based on the author`s experience gives useful guidelines for developing more efficient numerical simulators of steam injection and in-situ combustion. The paper takes up a series of questions related to simulating thermal processes. Included are: the elimination of constraint equations at the matrix level, phase change, steam injection rate, alternative treatments of heat loss, relative permeabilities and importance of hysteresis effects, improved solutions to the grid orientation problem and other simulation problems such as potential inversion, grid block size, time-step size control and induced fractures. The points discussed in the paper should be of use to both simulator developers and users alike, and will lead to a better understanding of simulation results

Numerical analysis of the Anderson localization

International Nuclear Information System (INIS)

Markos, P.

2006-01-01

The aim of this paper is to demonstrate, by simple numerical simulations, the main transport properties of disordered electron systems. These systems undergo the metal insulator transition when either Fermi energy crosses the mobility edge or the strength of the disorder increases over critical value. We study how disorder affects the energy spectrum and spatial distribution of electronic eigenstates in the diffusive and insulating regime, as well as in the critical region of the metal-insulator transition. Then, we introduce the transfer matrix and conductance, and we discuss how the quantum character of the electron propagation influences the transport properties of disordered samples. In the weakly disordered systems, the weak localization and anti-localization as well as the universal conductance fluctuation are numerically simulated and discussed. The localization in the one dimensional system is described and interpreted as a purely quantum effect. Statistical properties of the conductance in the critical and localized regimes are demonstrated. Special attention is given to the numerical study of the transport properties of the critical regime and to the numerical verification of the single parameter scaling theory of localization. Numerical data for the critical exponent in the orthogonal models in dimension 2 < d ≤ 5 are compared with theoretical predictions. We argue that the discrepancy between the theory and numerical data is due to the absence of the self-averaging of transmission quantities. This complicates the analytical analysis of the disordered systems. Finally, theoretical methods of description of weakly disordered systems are explained and their possible generalization to the localized regime is discussed. Since we concentrate on the one-electron propagation at zero temperature, no effects of electron-electron interaction and incoherent scattering are discussed in the paper (Author)

Transfer of numeric ASCII data files between Apple and IBM personal computers.

Science.gov (United States)

Allan, R W; Bermejo, R; Houben, D

1986-01-01

Listings for programs designed to transfer numeric ASCII data files between Apple and IBM personal computers are provided with accompanying descriptions of how the software operates. Details of the hardware used are also given. The programs may be easily adapted for transferring data between other microcomputers.

Numerical simulation of avascular tumor growth

Energy Technology Data Exchange (ETDEWEB)

Slezak, D Fernandez; Suarez, C; Soba, A; Risk, M; Marshall, G [Laboratorio de Sistemas Complejos, Departamento de Computacion, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires (C1428EGA) Buenos Aires (Argentina)

2007-11-15

A mathematical and numerical model for the description of different aspects of microtumor development is presented. The model is based in the solution of a system of partial differential equations describing an avascular tumor growth. A detailed second-order numeric algorithm for solving this system is described. Parameters are swiped to cover a range of feasible physiological values. While previous published works used a single set of parameters values, here we present a wide range of feasible solutions for tumor growth, covering a more realistic scenario. The model is validated by experimental data obtained with a multicellular spheroid model, a specific type of in vitro biological model which is at present considered to be optimum for the study of complex aspects of avascular microtumor physiology. Moreover, a dynamical analysis and local behaviour of the system is presented, showing chaotic situations for particular sets of parameter values at some fixed points. Further biological experiments related to those specific points may give potentially interesting results.

Experimental and numerical investigation on two-phase flow instabilities

Energy Technology Data Exchange (ETDEWEB)

Ruspini, Leonardo Carlos

2013-03-01

Two-phase flow instabilities are experimentally and numerically studied within this thesis. In particular, the phenomena called Ledinegg instability, density wave oscillations and pressure drop oscillations are investigated. The most important investigations regarding the occurrence of two-phase flow instabilities are reviewed. An extensive description of the main contributions in the experimental and analytical research is presented. In addition, a critical discussion and recommendations for future investigations are presented. A numerical framework using a hp-adaptive method is developed in order to solve the conservation equations modelling general thermo-hydraulic systems. A natural convection problem is analysed numerically in order to test the numerical solver. Moreover, the description of an adaptive strategy to solve thermo-hydraulic problems is presented. In the second part of this dissertation, a homogeneous model is used to study Ledinegg, density wave and pressure drop oscillations phenomena numerically. The dynamic characteristics of the Ledinegg (flow excursion) phenomenon are analysed through the simulation of several transient examples. In addition, density wave instabilities in boiling and condensing systems are investigated. The effects of several parameters, such as the fluid inertia and compressibility volumes, on the stability limits of Ledinegg and density wave instabilities are studied, showing a strong influence of these parameters. Moreover, the phenomenon called pressure drop oscillations is numerically investigated. A discussion of the physical representation of several models is presented with reference to the obtained numerical results. Finally, the influence of different parameters on these phenomena is analysed. In the last part, an experimental investigation of these phenomena is presented. The designing methodology used for the construction of the experimental facility is described. Several simulations and a non

TOOLS FOR COLABORATIVE LEARNING: A ROLE-PLAYING PRACTICE HERRAMIENTAS PARA EL APRENDIZAJE COLABORATIVO: UNA APLICACIÓN PRÁCTICA DEL JUEGO DE ROL

Directory of Open Access Journals (Sweden)

Marta Ortiz-de-Urbina Criado

2010-11-01

Full Text Available Role-playing is an active participation tool that facilitates cooperative learning. It has also proved to be more effective in developing competencies than traditional methods. This technique is essential to make theory and practice compatible as is required in order to adapt subjects to the new education system based on the Bolonia’s agreement, especially in Social Sciences disciplines. Consequently, the objective of this paper is to show the effect and use of role-playing applied to management area. Therefore, we analyze and design the role-playing, putting it in practice in the classroom in Human Resource Management subject of different academic degrees. To conclude, this paper has shown the importance of role-playing as a learning tool and development of skills like work cooperation, problem and conflict solving, decision making, and managing complex systems.El juego de rol es una herramienta de participación activa del alumno que facilita el aprendizaje cooperativo y que puede ser más efectiva que los métodos tradicionales para la formación en competencias. Esta técnica es esencial para compatibilizar la teoría y la práctica que se requiere para la adaptación de las asignaturas al EEES, en especial las que pertenecen al ámbito de Ciencias Sociales. Por ello, el objetivo de este trabajo es demostrar el efecto y la utilidad del juego de rol en el ámbito de la Organización de Empresas. En concreto, se analiza y explica el diseño y la puesta en práctica de esta herramienta en al aula en la asignatura de ‘Dirección de Recursos Humanos’. Su utilización durante varios cursos académicos nos ha mostrado que es una herramienta útil, que facilita el aprendizaje del alumno y el desarrollo de capacidades como el trabajo en grupo, la resolución de problemas y conflictos, la toma de decisiones y la dirección de sistemas complejos.

Microscopical description of isovector collective Osup(+) states in atomic nuclei

International Nuclear Information System (INIS)

Chekanov, N.A.

1983-01-01

A microscopical consistent description of isobar-analogue states and isovector monopole giant resonances is given in framework of the random-phase theory. The necessary one-particle basis, including the continuous spectrum, is determined by solution of the Hartree-Fock equations with the effective Skyrme-type interaction. An important feature of such a description is an automatical fulfilment of the consistency conditions relating the shell potential, nuclear density and the residual interaction. Effects due to Coulomb interaction in nuclei are investigated, such as the Coulomb shift energies, isospin admixtures to the ground state of the parent nucleus. Transition densities for the analogue states are obtained. Numerical calculations have been performed in the coordinate space for a number of neutron-rich nuclei

Numerical simulation studies of the LBNL heavy-ion beam combiner experiment

International Nuclear Information System (INIS)

Fawley, W.M.; Seidl, P.; Haber, I.; Friedman, A.; Grote, D.P.

1997-01-01

Transverse beam combining is a cost-saving option employed in many designs for heavy-ion inertial fusion energy drivers. A major area of interest, both theoretically and experimentally, is the resultant transverse phase space dilution during the beam merging process. Currently, a prototype combining experiment is underway at LBNL and we have employed a variety of numerical descriptions to aid in both the initial design of the experiment data. These range from simple envelope codes to detailed 2- and 3-D PIC simulations. We compare the predictions of the different numerical models to each other and to experimental data at different longitudinal positions

Numerical modelling of carbonate platforms and reefs: approaches and opportunities

Energy Technology Data Exchange (ETDEWEB)

Dalmasso, H.; Montaggioni, L.F.; Floquet, M. [Universite de Provence, Marseille (France). Centre de Sedimentologie-Palaeontologie; Bosence, D. [Royal Holloway University of London, Egham (United Kingdom). Dept. of Geology

2001-07-01

This paper compares different computing procedures that have been utilized in simulating shallow-water carbonate platform development. Based on our geological knowledge we can usually give a rather accurate qualitative description of the mechanisms controlling geological phenomena. Further description requires the use of computer stratigraphic simulation models that allow quantitative evaluation and understanding of the complex interactions of sedimentary depositional carbonate systems. The roles of modelling include: (1) encouraging accuracy and precision in data collection and process interpretation (Watney et al., 1999); (2) providing a means to quantitatively test interpretations concerning the control of various mechanisms on producing sedimentary packages; (3) predicting or extrapolating results into areas of limited control; (4) gaining new insights regarding the interaction of parameters; (5) helping focus on future studies to resolve specific problems. This paper addresses two main questions, namely: (1) What are the advantages and disadvantages of various types of models? (2) How well do models perform? In this paper we compare and discuss the application of five numerical models: CARBONATE (Bosence and Waltham, 1990), FUZZIM (Nordlund, 1999), CARBPLAT (Bosscher, 1992), DYNACARB (Li et al., 1993), PHIL (Bowman, 1997) and SEDPAK (Kendall et al., 1991). The comparison, testing and evaluation of these models allow one to gain a better knowledge and understanding of controlling parameters of carbonate platform development, which are necessary for modelling. Evaluating numerical models, critically comparing results from models using different approaches, and pushing experimental tests to their limits, provide an effective vehicle to improve and develop new numerical models. A main feature of this paper is to closely compare the performance between two numerical models: a forward model (CARBONATE) and a fuzzy logic model (FUZZIM). These two models use common

A atuação governamental e o processo de migração interna: o caso da Vila Rural da Paz – Rolândia PR)

OpenAIRE

Dores, Júlia Luciana Pereira das; Asari, Alice Yatiyo

2011-01-01

  Este trabalho buscou analisar o processo de migração interna no Brasil, particularmente no Estado do Paraná, assim como verificar as ações do Governo, tendo como objeto de estudo a Vila Rural da Paz, situada no Distrito de São Martinho – Rolândia PR. Além disso, analisou-se a trajetória de vida dos moradores residentes na Vila, tendo como ponto fundamental os deslocamentos, a industrialização do campo, e o papel do Programa Vilas Rurais na fixação dos trabalhadores rurais no município de Ro...

Visualising magnetic fields numerical equation solvers in action

CERN Document Server

Beeteson, John Stuart

2001-01-01

Visualizing Magnetic Fields: Numerical Equation Solvers in Action provides a complete description of the theory behind a new technique, a detailed discussion of the ways of solving the equations (including a software visualization of the solution algorithms), the application software itself, and the full source code. Most importantly, there is a succinct, easy-to-follow description of each procedure in the code.The physicist Michael Faraday said that the study of magnetic lines of force was greatly influential in leading him to formulate many of those concepts that are now so fundamental to our modern world, proving to him their "great utility as well as fertility." Michael Faraday could only visualize these lines in his mind's eye and, even with modern computers to help us, it has been very expensive and time consuming to plot lines of force in magnetic fields

Acompañamiento Educativo: El rol del educador en Aprendizaje y Servicio Solidario

Directory of Open Access Journals (Sweden)

Ángela García-Pérez

2015-01-01

Full Text Available El acompañamiento educativo es una dimensión fundamental en los procesos de crecimiento y desarrollo de individuos y grupos. Educar a través del cuidado de las relaciones, del clima y del estilo educativo constituye un proceso de apoyo a la construcción de itinerarios personales y sociales, enriquecido por matices experienciales en la planificación de proyectos desde enfoques metodológicos como el de Aprendizaje y Servicio Solidario (AySS.En concreto, el estilo educativo del AySS y la actitud de la persona acompañante posibilitanconceder el protagonismo pedagógico de cada experiencia al educando. Además, este liderazgo no puede darse sin la participación de todos los agentes implicados.Con todo ello, se realiza un recorrido por el acompañamiento educativo como proceso, dado el liderazgo democrático y prosocial de los educadores, así como el protagonismo pedagógico y liderazgo de los educandos; se presenta el AySS como propuesta educativa que permite “aprender mientras se realiza un servicio a la comunidad” y, finalmente, se ofrecen orientaciones hacia el rol de la persona educadora en los proyectos de AySS.Así, se considera a la juventud (o a cualquier otro colectivo implicado como sujetos de derechos y responsabilidades; partícipes de un procesode aprendizaje con funcionalidad y relevancia práctica y en el que puedan realizar aportaciones significativas a la comunidad, consolidando su propia historia personal y colectiva.

AUTO-DETERMINACIÓN Y DISCERNIMIENTO: EL CURADOR COMO CO-PRODUCTOR Y SU ROL EN CONFIGURACIÓN DE SIGNIFICADOS

Directory of Open Access Journals (Sweden)

Gabriel Gutnisky

2013-06-01

Full Text Available La condición del arte contemporáneo no puede sino pensarse enmarcada en el cambio cultural del “tardocapitalismo” en donde como identificación se revela un nuevo régimen de la imagen  en el que la obra individual es desplazada por la muestra o exhibición como la unidad mínima de significación. Este desplazamiento resulta un cambio de paradigma que prefigura el rol determinante del curador –un productor de servicios y no de objetos u artefactos- que, como intentaremos desarrollar en este trabajo, en el ámbito local y ante la falta de estímulos, se asume no tanto como gestión museística sino como iniciativa de una conciencia artística que produce a partir del trabajo del otro, pero sin dejar resto físico-a excepción de la redacción en un eventual catálogo- ni participar del precario régimen propietario.

Uncertainty analysis of a one-dimensional constitutive model for shape memory alloy thermomechanical description

DEFF Research Database (Denmark)

Oliveira, Sergio A.; Savi, Marcelo A.; Santos, Ilmar F.

2014-01-01

The use of shape memory alloys (SMAs) in engineering applications has increased the interest of the accuracy analysis of their thermomechanical description. This work presents an uncertainty analysis related to experimental tensile tests conducted with shape memory alloy wires. Experimental data...... are compared with numerical simulations obtained from a constitutive model with internal constraints employed to describe the thermomechanical behavior of SMAs. The idea is to evaluate if the numerical simulations are within the uncertainty range of the experimental data. Parametric analysis is also developed...

Free Software Development. 3. Numerical Description of Soft Acid with Soft Base Titration

Directory of Open Access Journals (Sweden)

Lorentz JÄNTSCHI

2002-12-01

Full Text Available The analytical methods of qualitative and quantitative determination of ions in solutions are very flexible to automation. The present work is focus on modeling the process of titration and presents a numerical simulation of acid-base titration. A PHP program to compute all iterations in titration process that solves a 3th rank equation to find value of pH for was built and is available through http internet protocol at the address: http://vl.academicdirect.org/molecular_dynamics/ab_titrations/v1.1/ The method allows expressing the value of pH in any point of titration process and permits to observe the equivalence point of titration.

Notas para una propuesta sobre las relaciones entre familia y educación: rol de los padres en el aprendizaje de la lectura y la comprensión lectura

Directory of Open Access Journals (Sweden)

Juana Pinzás García

1987-12-01

Full Text Available Este artículo trata sobre el rol del hogar en la educación de los niños peruanos en el contexto de los factores que influyen directa o indirectamente sobre el aprendizaje. Se sugiere que la familia es un factor intermediario. Se propone que los colegios deben asumir un liderazgo en la incorporación de las familias, ayudándolas a preparar a sus niños para el aprendizaje, por ejemplo, de la lectura. Se ofrece resultados de investigaciones y comentarios sobre el caso peruano.

Palliative Care Medical Education in European Universities: A Descriptive Study and Numerical Scoring System Proposal for Assessing Educational Development.

Science.gov (United States)

Carrasco, José Miguel; Lynch, Thomas J; Garralda, Eduardo; Woitha, Kathrin; Elsner, Frank; Filbet, Marilène; Ellershaw, John E; Clark, David; Centeno, Carlos

2015-10-01

The lack of palliative medicine (PM) education has been identified as a barrier to the development of the discipline. A number of international institutions have called for its implementation within undergraduate medical curricula. The objectives are to describe the situation of undergraduate PM education in Europe and to propose a scoring system to evaluate its status. This descriptive study was conducted with data provided by key experts from countries of the World Health Organization European Region (n = 53). A numerical scoring system was developed through consensus techniques. Forty-three countries (81%) provided the requested information. In 13 countries (30%), a PM course is taught in all medical schools, being compulsory in six of them (14%). In 15 countries (35%), PM is taught in at least one university. In 14 countries (33%), PM is not taught within medical curricula. A full professor of PM was identified in 40% of countries. Three indicators were developed to construct a scale (rank 0-100) of educational development: 1) proportion of medical schools that teach PM (weight = 32%); 2) proportion of medical schools that offer PM as a compulsory subject (weight = 40%); 3) total number of PM professors (weight = 28%). The highest level of PM educational development was found in Israel, Norway, the U.K., Belgium, France, Austria, Germany, and Ireland. PM is taught in a substantial number of undergraduate medical programs at European universities, and a qualified teaching structure is emerging; however, there is a wide variation in the level of PM educational development between individual countries. Copyright © 2015 American Academy of Hospice and Palliative Medicine. Published by Elsevier Inc. All rights reserved.

About the statistical description of gas-liquid flows

Energy Technology Data Exchange (ETDEWEB)

Sanz, D.; Guido-Lavalle, G.; Carrica, P. [Centro Atomico Bariloche and Instituto Balseiro (Argentina)] [and others

1995-09-01

Elements of the probabilistic geometry are used to derive the bubble coalescence term of the statistical description of gas liquid flows. It is shown that the Boltzmann`s hypothesis, that leads to the kinetic theory of dilute gases, is not appropriate for this kind of flows. The resulting integro-differential transport equation is numerically integrated to study the flow development in slender bubble columns. The solution remarkably predicts the transition from bubbly to slug flow pattern. Moreover, a bubbly bimodal size distribution is predicted, which has already been observed experimentally.

Qualitative Description of Spatial Quality in Inclusive Architecture.

Science.gov (United States)

Ryhl, Camilla; Kajita, Masashi; Sørensen, René

2016-01-01

Universal design (UD) has gained global significance and is in the process of institutionalisation in the Nordic Region. This is despite an urgent necessity for developing the theoretical basis and practical applicability of UD. Reflecting this need for furthering the comprehensive understanding of spatial implication of UD, this paper aims to contribute for articulating a means to assess the quality of UD in architecture. Drawing upon numerous cases from research conducted at the Danish Building Research Institute, the paper focuses on sensory aspects of spatial quality, and discusses as well as reflects an applied method for producing the qualitative description of selected buildings that embody UD through creative solutions. The qualitative description of collected examples appears to be effective in delineating sensory aspects of spatial experience; however the systematic development of assessment criteria is essential in order to support students and designers to make responsible decisions in shaping built environments that are accessible and inclusive but also enjoyable.

SIVEH: Numerical Computing Simulation of Wireless Energy-Harvesting Sensor Nodes

Directory of Open Access Journals (Sweden)

Pedro Yuste

2013-09-01

Full Text Available The paper presents a numerical energy harvesting model for sensor nodes, SIVEH (Simulator I–V for EH, based on I–V hardware tracking. I–V tracking is demonstrated to be more accurate than traditional energy modeling techniques when some of the components present different power dissipation at either different operating voltages or drawn currents. SIVEH numerical computing allows fast simulation of long periods of time—days, weeks, months or years—using real solar radiation curves. Moreover, SIVEH modeling has been enhanced with sleep time rate dynamic adjustment, while seeking energy-neutral operation. This paper presents the model description, a functional verification and a critical comparison with the classic energy approach.

Use of Green's functions in the numerical solution of two-point boundary value problems

Science.gov (United States)

Gallaher, L. J.; Perlin, I. E.

1974-01-01

This study investigates the use of Green's functions in the numerical solution of the two-point boundary value problem. The first part deals with the role of the Green's function in solving both linear and nonlinear second order ordinary differential equations with boundary conditions and systems of such equations. The second part describes procedures for numerical construction of Green's functions and considers briefly the conditions for their existence. Finally, there is a description of some numerical experiments using nonlinear problems for which the known existence, uniqueness or convergence theorems do not apply. Examples here include some problems in finding rendezvous orbits of the restricted three body system.

Exploring the Causes of Underachievement of African American Boys: A Qualitative Descriptive Case Study

Science.gov (United States)

Ennis, Rosetta

2017-01-01

The qualitative descriptive case study explores the underachievement phenomenon of fourth-grade African American boys in New York City public elementary schools. Numerous studies have been conducted at the middle school through college levels. However, very little is known about the underachievement phenomenon of fourth-grade African American…

Stable long-time semiclassical description of zero-point energy in high-dimensional molecular systems.

Science.gov (United States)

Garashchuk, Sophya; Rassolov, Vitaly A

2008-07-14

Semiclassical implementation of the quantum trajectory formalism [J. Chem. Phys. 120, 1181 (2004)] is further developed to give a stable long-time description of zero-point energy in anharmonic systems of high dimensionality. The method is based on a numerically cheap linearized quantum force approach; stabilizing terms compensating for the linearization errors are added into the time-evolution equations for the classical and nonclassical components of the momentum operator. The wave function normalization and energy are rigorously conserved. Numerical tests are performed for model systems of up to 40 degrees of freedom.

Rock mechanics site descriptive model-theoretical approach. Preliminary site description Forsmark area - version 1.2

Energy Technology Data Exchange (ETDEWEB)

Fredriksson, Anders; Olofsson, Isabelle [Golder Associates AB, Uppsala (Sweden)

2005-12-15

The present report summarises the theoretical approach to estimate the mechanical properties of the rock mass in relation to the Preliminary Site Descriptive Modelling, version 1.2 Forsmark. The theoretical approach is based on a discrete fracture network (DFN) description of the fracture system in the rock mass and on the results of mechanical testing of intact rock and on rock fractures. To estimate the mechanical properties of the rock mass a load test on a rock block with fractures is simulated with the numerical code 3DEC. The location and size of the fractures are given by DFN-realisations. The rock block was loaded in plain strain condition. From the calculated relationship between stresses and deformations the mechanical properties of the rock mass were determined. The influence of the geometrical properties of the fracture system on the mechanical properties of the rock mass was analysed by loading 20 blocks based on different DFN-realisations. The material properties of the intact rock and the fractures were kept constant. The properties are set equal to the mean value of each measured material property. The influence of the variation of the properties of the intact rock and variation of the mechanical properties of the fractures are estimated by analysing numerical load tests on one specific block (one DFN-realisation) with combinations of properties for intact rock and fractures. Each parameter varies from its lowest values to its highest values while the rest of the parameters are held constant, equal to the mean value. The resulting distribution was expressed as a variation around the value determined with mean values on all parameters. To estimate the resulting distribution of the mechanical properties of the rock mass a Monte-Carlo simulation was performed by generating values from the two distributions independent of each other. The two values were added and the statistical properties of the resulting distribution were determined.

Rock mechanics site descriptive model-theoretical approach. Preliminary site description Forsmark area - version 1.2

International Nuclear Information System (INIS)

Fredriksson, Anders; Olofsson, Isabelle

2005-12-01

The present report summarises the theoretical approach to estimate the mechanical properties of the rock mass in relation to the Preliminary Site Descriptive Modelling, version 1.2 Forsmark. The theoretical approach is based on a discrete fracture network (DFN) description of the fracture system in the rock mass and on the results of mechanical testing of intact rock and on rock fractures. To estimate the mechanical properties of the rock mass a load test on a rock block with fractures is simulated with the numerical code 3DEC. The location and size of the fractures are given by DFN-realisations. The rock block was loaded in plain strain condition. From the calculated relationship between stresses and deformations the mechanical properties of the rock mass were determined. The influence of the geometrical properties of the fracture system on the mechanical properties of the rock mass was analysed by loading 20 blocks based on different DFN-realisations. The material properties of the intact rock and the fractures were kept constant. The properties are set equal to the mean value of each measured material property. The influence of the variation of the properties of the intact rock and variation of the mechanical properties of the fractures are estimated by analysing numerical load tests on one specific block (one DFN-realisation) with combinations of properties for intact rock and fractures. Each parameter varies from its lowest values to its highest values while the rest of the parameters are held constant, equal to the mean value. The resulting distribution was expressed as a variation around the value determined with mean values on all parameters. To estimate the resulting distribution of the mechanical properties of the rock mass a Monte-Carlo simulation was performed by generating values from the two distributions independent of each other. The two values were added and the statistical properties of the resulting distribution were determined

CHANGE OF ATTITUDES AND VALUES BEFORE THE ENERGY AFTER THE USE OF A ROLE-PLAYING GAME CAMBIO DE ACTITUDES Y VALORES ANTE LA ENERGÍA TRAS EL USO DE UN JUEGO DE ROL

Directory of Open Access Journals (Sweden)

Jorge Hernández Carbonell

2010-11-01

Full Text Available The role-playing game in education have been defined as dramatizations that are carry out around a situation makes specific and use the allocation of papers to students, who will have as opposed to, to defend with arguments an opinion (previously outlined a problem. More and more used in the formal and non formal education, they emphasize between its advantages turning the playful thing learning, harnessing the learning of attitudes and values and the connection that is made with the real life among others. The use of a role-playing game in an educative investigation on change of attitudes and values before the power resources whose educative results were positive, allowed to repeat this investigation using the variable “utilization/no use of the role-playing game”, which granted the possibility of analyzing the importance of the role-playing game in the involution of changes in the attitudes and values of the users of these games. Los juegos de rol en educación se han definido como dramatizaciones que se vertebran en torno a una situación concreta y utilizan la asignación de papeles a alumnos, quienes deberán defender con argumentos una opinión (previamente perfilada frente a un problema. Cada vez más utilizados en la educación formal y no formal, destacan entre sus ventajas el convertir lo lúdico en aprendizaje, potenciar el aprendizaje de actitudes y valores y la conexión que se realiza con la vida real entre otros. La utilización de un juego de rol en una investigación educativa sobre cambio de actitudes y valores ante los recursos energéticos cuyos resultados educativos fueron positivos, permitió repetir dicha investigación usando la variable “utilización/no utilización del juego de rol”, lo que concedió la posibilidad de analizar la importancia de los juegos de rol en la potenciación de cambios en las actitudes y valores de los usuarios de estos juegos.

Pattern formation and filamentation in low temperature, magnetized plasmas - a numerical approach

Science.gov (United States)

Menati, Mohamad; Konopka, Uwe; Thomas, Edward

2017-10-01

In low-temperature discharges under the influence of high magnetic field, pattern and filament formation in the plasma has been reported by different groups. The phenomena present themselves as bright plasma columns (filaments) oriented parallel to the magnetic field lines at high magnetic field regime. The plasma structure can filament into different shapes from single columns to spiral and bright rings when viewed from the top. In spite of the extensive experimental observations, the observed effects lack a detailed theoretical and numerical description. In an attempt to numerically explain the plasma filamentation, we present a simplified model for the plasma discharge and power deposition into the plasma. Based on the model, 2-D and 3-D codes are being developed that solve Poisson's equation along with the fluid equations to obtain a self-consistent description of the plasma. The model and preliminary results applied to the specific plasma conditions will be presented. This work was supported by the US Dept. of Energy and NSF, DE-SC0016330, PHY-1613087.

Electromagnetic scattering problems -Numerical issues and new experimental approaches of validation

Energy Technology Data Exchange (ETDEWEB)

Geise, Robert; Neubauer, Bjoern; Zimmer, Georg [University of Braunschweig, Institute for Electromagnetic Compatibility, Schleinitzstrasse 23, 38106 Braunschweig (Germany)

2015-03-10

Electromagnetic scattering problems, thus the question how radiated energy spreads when impinging on an object, are an essential part of wave propagation. Though the Maxwell’s differential equations as starting point, are actually quite simple,the integral formulation of an object’s boundary conditions, respectively the solution for unknown induced currents can only be solved numerically in most cases.As a timely topic of practical importance the scattering of rotating wind turbines is discussed, the numerical description of which is still based on rigorous approximations with yet unspecified accuracy. In this context the issue of validating numerical solutions is addressed, both with reference simulations but in particular with the experimental approach of scaled measurements. For the latter the idea of an incremental validation is proposed allowing a step by step validation of required new mathematical models in scattering theory.

Descriptive Research

DEFF Research Database (Denmark)

Wigram, Anthony Lewis

2003-01-01

Descriptive research is described by Lathom-Radocy and Radocy (1995) to include Survey research, ex post facto research, case studies and developmental studies. Descriptive research also includes a review of the literature in order to provide both quantitative and qualitative evidence of the effect...... starts will allow effect size calculations to be made in order to evaluate effect over time. Given the difficulties in undertaking controlled experimental studies in the creative arts therapies, descriptive research methods offer a way of quantifying effect through descriptive statistical analysis...

Development of a numerical 2-dimensional beach evolution model

DEFF Research Database (Denmark)

Baykal, Cüneyt

2014-01-01

This paper presents the description of a 2-dimensional numerical model constructed for the simulation of beach evolution under the action of wind waves only over the arbitrary land and sea topographies around existing coastal structures and formations. The developed beach evolution numerical model...... is composed of 4 submodels: a nearshore spectral wave transformation model based on an energy balance equation including random wave breaking and diffraction terms to compute the nearshore wave characteristics, a nearshore wave-induced circulation model based on the nonlinear shallow water equations...... to compute the nearshore depth-averaged wave-induced current velocities and mean water level changes, a sediment transport model to compute the local total sediment transport rates occurring under the action of wind waves, and a bottom evolution model to compute the bed level changes in time based...

Numerical modeling of batch formation in waste incineration plants

Directory of Open Access Journals (Sweden)

Obroučka Karel

2015-03-01

Full Text Available The aim of this paper is a mathematical description of algorithm for controlled assembly of incinerated batch of waste. The basis for formation of batch is selected parameters of incinerated waste as its calorific value or content of pollutants or the combination of both. The numerical model will allow, based on selected criteria, to compile batch of wastes which continuously follows the previous batch, which is a prerequisite for optimized operation of incinerator. The model was prepared as for waste storage in containers, as well as for waste storage in continuously refilled boxes. The mathematical model was developed into the computer program and its functionality was verified either by practical measurements or by numerical simulations. The proposed model can be used in incinerators for hazardous and municipal waste.

Numerical modelling of tissue-equivalent proportional counters

International Nuclear Information System (INIS)

Segur, P.; Colautti, P.

1995-01-01

In this paper a survey is given of the various numerical techniques employed to study the transport of ionising particles inside a TEPC. The first part is devoted to the description of the general concept of particle transport calculations. Thereafter, the different methods available to study transport phenomena and energy deposition in the sensitive volume and in counter walls are described. Finally, the basic ionisation mechanisms which may occur in a counter are described, and the non-equilibrium phenomena which play an important role mainly for counters that are to be used in measurements at the nanodosemeter level are studied. (author)

Numerical Calculation of Transport Based on the Drift-Kinetic Equation for Plasmas in General Toroidal Magnetic Geometry: Numerical Methods; Calculo Numerico de Transporte mediante la Ecuacion Cinetica de Deriva para Plasmas en Geometria Magnetica Toroidal: Metodos Numericos

Energy Technology Data Exchange (ETDEWEB)

Reynolds, J. M.; Lopez-Bruna, D.

2009-10-12

In this report we continue with the description of a newly developed numerical method to solve the drift kinetic equation for ions and electrons in toroidal plasmas. Several numerical aspects, already outlined in a previous report [Informes Tecnicos Ciemat 1165, mayo 2009], will be treated now in more detail. Aside from discussing the method in the context of other existing codes, various aspects will be now explained from the viewpoint of numerical methods: the way to solve convection equations, the adopted boundary conditions, the real-space meshing procedures along with a new software developed to build them, and some additional questions related with the parallelization and the numerical integration. (Author) 16 refs.

Advanced modelling and numerical strategies in nuclear thermal-hydraulics

International Nuclear Information System (INIS)

Staedtke, H.

2001-01-01

The first part of the lecture gives a brief review of the current status of nuclear thermal hydraulics as it forms the basis of established system codes like TRAC, RELAP5, CATHARE or ATHLET. Specific emphasis is given to the capabilities and limitations of the underlying physical modelling and numerical solution strategies with regard to the description of complex transient two-phase flow and heat transfer conditions as expected to occur in PWR reactors during off-normal and accident conditions. The second part of the lecture focuses on new challenges and future needs in nuclear thermal-hydraulics which might arise with regard to re-licensing of old plants using bestestimate methodologies or the design and safety analysis of Advanced Light Water Reactors relying largely on passive safety systems. In order to meet these new requirements various advanced modelling and numerical techniques will be discussed including extended wellposed (hyperbolic) two-fluid models, explicit modelling of interfacial area transport or higher order numerical schemes allowing a high resolution of local multi-dimensional flow processes.(author)

Graphic Description: The Mystery of Ibn Khafaja\\'s Success in Description

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جواد رنجبر

2009-12-01

Full Text Available Graphic Description:   The Mystery of Ibn Khafaja's Success in Description    Ali Bagher Taheriniya *  Javad Ranjbar **      Abstract Ibn Khafaja is one of the poets and men of letters in Spain. He is titled to Sanobari of Spain. He is one of the masters of description. Hence, the analysis of successful techniques he has used in the descriptive art could illuminate the way for others. Al-Taswir al-harfi (graphic description is a term which denotes the highest and most detailed poems. On this basis, the best descriptive poem is one which is closer to a painting. He has used some elements called conforming elements of description which contain: imagination, feeling, faculty, and dialogue as well as three other elements: to be inborn in description, enchanting nature and convenient life. This article is going to give an analysis of the reasons for Ibn Khafaja’s success in description and portrait making.   Key words: Ibn Khafaja, poetry, description, portrait   * Associate Professor, Bu Ali Sina University of Hamadan E-mail: bTaheriniya@yahoo.com  ** M.A. in Arabic Language and Literature

Employing Picture Description to Assess the Students' Descriptive Paragraph Writing

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Ida Ayu Mega Cahyani

2018-03-01

Full Text Available Writing is considered as an important skill in learning process which is needed to be mastered by the students. However, in teaching learning process at schools or universities, the assessment of writing skill is not becoming the focus of learning process and the assessment is administered inappropriately. In this present study, the researcher undertook the study which dealt with assessing descriptive paragraph writing ability of the students through picture description by employing an ex post facto as the research design. The present study was intended to answer the research problem dealing with the extent of the students’ achievement of descriptive paragraph writing ability which is assessed through picture description. The samples under the study were 40 students determined by means of random sampling technique with lottery system. The data were collected through administering picture description as the research instrument. The obtained data were analyzed by using norm-reference measure of five standard values. The results of the data analysis showed that there were 67.50% samples of the study were successful in writing descriptive paragraph, while there were 32.50% samples were unsuccessful in writing descriptive paragraph which was assessed by administering picture description test

Numerical Investigations of Moisture Distribution in a Selected Anisotropic Soil Medium

Science.gov (United States)

Iwanek, M.

2018-01-01

The moisture of soil profile changes both in time and space and depends on many factors. Changes of the quantity of water in soil can be determined on the basis of in situ measurements, but numerical methods are increasingly used for this purpose. The quality of the results obtained using pertinent software packages depends on appropriate description and parameterization of soil medium. Thus, the issue of providing for the soil anisotropy phenomenon gains a big importance. Although anisotropy can be taken into account in many numerical models, isotopic soil is often assumed in the research process. However, this assumption can be a reason for incorrect results in the simulations of water changes in soil medium. In this article, results of numerical simulations of moisture distribution in the selected soil profile were presented. The calculations were conducted assuming isotropic and anisotropic conditions. Empirical verification of the results obtained in the numerical investigations indicated statistical essential discrepancies for the both analyzed conditions. However, better fitting measured and calculated moisture values was obtained for the case of providing for anisotropy in the simulation model.

Charge transfer through single molecule contacts: How reliable are rate descriptions?

Directory of Open Access Journals (Sweden)

Denis Kast

2011-08-01

Full Text Available Background: The trend for the fabrication of electrical circuits with nanoscale dimensions has led to impressive progress in the field of molecular electronics in the last decade. However, a theoretical description of molecular contacts as the building blocks of future devices is challenging, as it has to combine the properties of Fermi liquids in the leads with charge and phonon degrees of freedom on the molecule. Outside of ab initio schemes for specific set-ups, generic models reveal the characteristics of transport processes. Particularly appealing are descriptions based on transfer rates successfully used in other contexts such as mesoscopic physics and intramolecular electron transfer. However, a detailed analysis of this scheme in comparison with numerically exact solutions is still elusive.Results: We show that a formulation in terms of transfer rates provides a quantitatively accurate description even in domains of parameter space where strictly it is expected to fail, e.g., at lower temperatures. Typically, intramolecular phonons are distributed according to a voltage driven steady state that can only roughly be captured by a thermal distribution with an effective elevated temperature (heating. An extension of a master equation for the charge–phonon complex, to effectively include the impact of off-diagonal elements of the reduced density matrix, provides very accurate solutions even for stronger electron–phonon coupling.Conclusion: Rate descriptions and master equations offer a versatile model to describe and understand charge transfer processes through molecular junctions. Such methods are computationally orders of magnitude less expensive than elaborate numerical simulations that, however, provide exact solutions as benchmarks. Adjustable parameters obtained, e.g., from ab initio calculations allow for the treatment of various realizations. Even though not as rigorously formulated as, e.g., nonequilibrium Green’s function

La gestión auténtica como moderadora de la relación entre (1 la congruencia de la identidad del rol de género –características de género de la gestión– y (2 el intercambio líder-subordinado (LMX

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Aharon Tziner

2014-01-01

Full Text Available Este trabajo analiza el efecto de la congruencia de la identidad del rol de género (andrógina/no andrógina y las características de género de la gestión (comunitaria/egocéntrica en la calidad del intercambio líder subordinado (LMX, así como que si la gestión auténtica es una variable que modere dicha relación. El estudio plantea la hipótesis de una relación positiva entre la identidad del rol de género y las características de género de la gestión con la calidad de la LMX. Otra hipótesis ha sido que la gestión auténtica modera y explica esta relación. La muestra constaba de 120 mujeres dirigidas por otras mujeres. Cumplimentaron un cuestionario en el que se les pedía evaluar y describir su percepción de su jefa de acuerdo a las variables del estudio: identidad del rol de género (andrógina/no andrógina, características de género de la gestión (comunitaria/egocéntrica, la calidad de la LMX y el grado de autenticidad característico de su estilo de gestión. Además se pidió a 24 directivos que cumplimentasen un cuestionario sobre la relación líder-subordinado (LMX que les caracterizaba. Los resultados avalaban todas nuestras hipótesis, señalando una relación positiva entre las variables. Cuando la identidad del rol de género y las características de género de la gestión eran congruentes se percibía que la calidad de la LMX era superior. Además se encontró que la gestión auténtica es realmente una variable moderadora; es decir, la relación entre la congruencia de la identidad del rol de género y las características de género de la gestión y la LMX es moderada y explicada por la ges tión auténtica. Otros resultados revelan la brecha entre líderes y subordinados al evaluar la LMX e informar sobre ella. Cuando no se hallaba congruencia había una brecha entre los informes de los líderes y de los subordinados; es decir, los primeros evaluaban mejor la LMX. Por otra parte, cuando había congruencia

A consistent meson-theoretic description of the NN-interaction

International Nuclear Information System (INIS)

Machleidt, R.

1985-01-01

In this paper, the meson-theory of the NN-interaction is performed consistently. All irreducible diagrams up to a total exchanged mass of about 1 GeV (i. e. up to the cutoff region) are taken into account. These diagrams contain in particular an explicit field theoretic model for the 2π-exchange taking into account virtual Δ-excitation and direct π π-interaction. This part of the model agrees quantitatively with results obtained from dispersion theory which in turn are based on the analysis of πN- and π π-scattering data. A detailed description of the lower partial wave phase-shifts of NN-scattering requires the introduction of irreducible diagrams containing also heavy boson exchange, in particular the combination of π and rho. In the framework of this consistent meson theory an accurate description of the NN-scattering data below 300 MeV laboratory energy as well as the deuteron data is achieved; the numerical results are superior to those of simplified boson exchange models

A numerical solution for the multi-server queue with hyper-exponential service times

NARCIS (Netherlands)

de Smit, J.H.A.

1983-01-01

In this paper we present a numerical method for the queue GI/H2/s, which is based on general results for GI/Hm/s. We give a complete description of the algorithm which yields exact results for the steady distributions of the actual waiting time, the virtual waiting time and the number of customers

Distinguishing Features and Similarities Between Descriptive Phenomenological and Qualitative Description Research.

Science.gov (United States)

Willis, Danny G; Sullivan-Bolyai, Susan; Knafl, Kathleen; Cohen, Marlene Z

2016-09-01

Scholars who research phenomena of concern to the discipline of nursing are challenged with making wise choices about different qualitative research approaches. Ultimately, they want to choose an approach that is best suited to answer their research questions. Such choices are predicated on having made distinctions between qualitative methodology, methods, and analytic frames. In this article, we distinguish two qualitative research approaches widely used for descriptive studies: descriptive phenomenological and qualitative description. Providing a clear basis that highlights the distinguishing features and similarities between descriptive phenomenological and qualitative description research will help students and researchers make more informed choices in deciding upon the most appropriate methodology in qualitative research. We orient the reader to distinguishing features and similarities associated with each approach and the kinds of research questions descriptive phenomenological and qualitative description research address. © The Author(s) 2016.

El rol de la escuela en la prevención y atención de la tartamudez / The role of the school in the prevention and attention of the stuttering

OpenAIRE

Pedro R. Rodríguez C.; Ruth Díaz Bello

2017-01-01

En la actualidad, el desarrollo de habilidades sociales y comunicativas son los pilares fundamentales del abordaje terapéutico de la persona que tartamudea y es, en el marco de la educación inclusiva, el contexto escolar el lugar más adecuado para su consecución, es por ello que este artículo tiene como finalidad discutir acerca del rol de la escuela en la prevención y atención de la tartamudez. Se discute acerca de la diferencia, la diversidad y la heterogeneidad en la escuela, se analizan l...

El rol de las redes de apoyo transnacional en la evolución del régimen de trata de personas en la región del mekong, 2004-2015

OpenAIRE

Álvarez Martínez, Laura Camila

2016-01-01

Con el fin de la unipolaridad no sólo se fortalecieron mecanismos de gobernanza global como los Regímenes Internacionales, sino también se fortalecieron actores no estatales. A pesar de la importancia que tomaron estos dos elementos aún no existe una teoría que explique exhaustivamente la relación que existe entre ellos. Es por lo anterior que, la investigación busca responder de qué manera el rol de las Redes de Apoyo Transnacional ha incidido en la evolución del régimen de tráfico de person...

Numerical simulation of thermal-hydraulic processes in the riser chamber of installation for clinker production

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Borsuk Grzegorz

2016-03-01

Full Text Available Clinker burning process has a decisive influence on energy consumption and the cost of cement production. A new problem is to use the process of decarbonization of alternative fuels from waste. These issues are particularly important in the introduction of a two-stage combustion of fuel in a rotary kiln without the typical reactor-decarbonizator. This work presents results of numerical studies on thermal-hydraulic phenomena in the riser chamber, which will be designed to burn fuel in the system where combustion air is supplied separately from the clinker cooler. The mathematical model is based on a combination of two methods of motion description: Euler description for the gas phase and Lagrange description for particles. Heat transfer between particles of raw material and gas was added to the numerical calculations. The main aim of the research was finding the correct fractional distribution of particles. For assumed particle distribution on the first stage of work, authors noted that all particles were carried away by the upper outlet to the preheater tower, what is not corresponding to the results of experimental studies. The obtained results of calculations can be the basis for further optimization of the design and operating conditions in the riser chamber with the implementation of the system.

Numerical regulation of a test facility of materials for PWR

International Nuclear Information System (INIS)

Zauq, M.H.

1982-02-01

The installation aims at testing materials used in nuclear power plants; tests consists in simulations of a design basis accident (failure of a primary circuit of a PWR type reactor) for a qualification of these materials. A description of the test installation, of the thermodynamic control, and of the control system is presented. The organisation of the software is then given: description of the sequence chaining monitor, operation, list and function of the programs. The analog information processing is also presented (data transmission). A real-time microcomputer and clock are used for this work. The microprocessor is the 6800 of MOTOROLA. The microcomputer used has been built around the MC 6800; its structure is described. The data acquisition include an analog data acquisition system and a numerical data acquisition system. Laboratory and on-site tests are finally presented [fr

L'evolució del rol dramàtic de la Bella Dorment i Malèfica a les adaptacions cinematogràfiques homònimes de 1959 i 2014

OpenAIRE

Escobar Pérez, Marina

2015-01-01

Aquest treball de recerca i investigació és el resultat d'un anàlisi qualitatiu i de gènere realitzat d'acord amb la teoria audiovisual narrativa i la teoria fílmica feminista sobre la representació cinematogràfica dels personatges de la Bella Dorment i Malèfica a les pel•lícules homònimes dels anys 1959 i 2014 amb l'objectiu de determinar l'evolució del seu rol dramàtic. Este trabajo de investigación es el resultado de un análisis cualitativo y de género realizado en base a la teoría audi...

Numerical methods for studying anharmonic oscillator approximations to the phi super 4 sub 2 quantum field theory

Science.gov (United States)

Isaacson, D.; Marchesin, D.; Paes-Leme, P. J.

1980-01-01

This paper is an expanded version of a talk given at the 1979 T.I.C.O.M. conference. It is a self-contained introduction, for applied mathematicians and numerical analysts, to quantum mechanics and quantum field theory. It also contains a brief description of the authors' numerical approach to the problems of quantum field theory, which may best be summarized by the question; Can we compute the eigenvalues and eigenfunctions of Schrodinger operators in infinitely many variables.

Entre héroes y traidores: Sentidos militares y militantes acerca del rol de los conscriptos en los años 70

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Santiago Garaño

2011-06-01

Full Text Available En este trabajo analizaremos cómo las autoridades militares argentinas concibieron el rol que los conscriptos debían jugar en la autodenominada “lucha contra la subversión”, en el contexto de violencia política previo al golpe de estado del 24 de marzo de 1976. En primer lugar, mostraremos que los soldados que cumplían el servicio militar obligatorio fueron interpelados no sólo por el Ejército sino también por el PRT-ERP, apelando en ambos casos a los valores morales del 'heroísmo' y del 'sacrificio' de la propia vida. En segundo lugar, argumentaremos que el personal militar fundó una lógica binaria “héroe”-”traidor” como parámetro para juzgar moralmente las conductas de los conscriptos. Por último, postularemos que se apuntaló ese código moral utilizando ideas de pureza, contaminación y peligro.

Development of a set of benchmark problems to verify numerical methods for solving burnup equations

International Nuclear Information System (INIS)

Lago, Daniel; Rahnema, Farzad

2017-01-01

Highlights: • Description transmutation chain benchmark problems. • Problems for validating numerical methods for solving burnup equations. • Analytical solutions for the burnup equations. • Numerical solutions for the burnup equations. - Abstract: A comprehensive set of transmutation chain benchmark problems for numerically validating methods for solving burnup equations was created. These benchmark problems were designed to challenge both traditional and modern numerical methods used to solve the complex set of ordinary differential equations used for tracking the change in nuclide concentrations over time due to nuclear phenomena. Given the development of most burnup solvers is done for the purpose of coupling with an established transport solution method, these problems provide a useful resource in testing and validating the burnup equation solver before coupling for use in a lattice or core depletion code. All the relevant parameters for each benchmark problem are described. Results are also provided in the form of reference solutions generated by the Mathematica tool, as well as additional numerical results from MATLAB.

Desarrollo de la microbiota gastrointestinal en lactantes y su rol en salud y enfermedad

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Carolina A. Serrano Honeyman

2016-05-01

Full Text Available Durante la última década, con la aparición de técnicas de secuenciación de última generación basadas en la filogenia del gen 16S rRNA y complejas plataformas bioinformáticas, la composición del microbioma y su rol en salud y enfermedad ha sido sujeto de investigación activa. Existe una creciente evidencia entre la disbiosis microbiana y un riesgo aumentado de desarrollar enfermedades de tipo inflamatorio, autoinmune, y metabólico tales como asma, diabetes, obesidad y enfermedades gastrointestinales crónicas. El ensamblaje de la microbiota intestinal en los humanos comienza antes y durante el proceso de parto y evoluciona con la alimentación durante la infancia y debe ser entendido en profunda  relación con el microbioma de su madre. La comprensión del impacto de la microbiota en la morbilidad en humanos necesariamente requerirá de una etapa previa como es el conocimiento del desarrollo y ensamblaje precoz de la microbiota en recién nacidos, y como intervenciones médicas precoces como es la elección en la ruta de parto (parto cesárea versus parto vaginal, uso precoz de antibióticos, selección de fórmula láctea (lactancia materna versus formulas artificiales, entre otros, pueden modificar en forma sustancial su conformación y a través de cambios en el desarrollo del sistema inmune, ejercer un impacto en salud y enfermedad en neonatos, lactantes y posteriormente a lo largo de la vida de un ser humano.

El negocio de la producción de semillas mejoradas y su rol en el proceso de privatización de la agricultura mexicana

Directory of Open Access Journals (Sweden)

Gilberto Aboites

1999-01-01

Full Text Available Este artículo rastrea los orígenes de la producción industrial de semillas mejoradas y enfatiza su rol en la privatización de la agricultura mexicana. El argumento establece que la modernización de la agricultura no se puede concebir como una acción homogénea y siempre progresista, como si se hubiera podido decretar de un solo golpe y para siempre, sino que ha sufrido diversos cambios, adecuaciones y retrocesos. En las conclusiones se resalta el alto grado de concentración que se tiene en la Asociación empresarial de productores de semillas mejoradas y sus efectos para la autosuficencia alimentaria y la exclusión de muchas zonas productoras de maíz donde la mayoría de los productores son campesinos pobres.

How to determine composite material properties using numerical homogenization

DEFF Research Database (Denmark)

Andreassen, Erik; Andreasen, Casper Schousboe

2014-01-01

Numerical homogenization is an efficient way to determine effective macroscopic properties, such as the elasticity tensor, of a periodic composite material. In this paper an educational description of the method is provided based on a short, self-contained Matlab implementation. It is shown how...... the basic code, which computes the effective elasticity tensor of a two material composite, where one material could be void, is easily extended to include more materials. Furthermore, extensions to homogenization of conductivity, thermal expansion, and fluid permeability are described in detail. The unit...

Modelling of multidimensional quantum systems by the numerical functional integration

International Nuclear Information System (INIS)

Lobanov, Yu.Yu.; Zhidkov, E.P.

1990-01-01

The employment of the numerical functional integration for the description of multidimensional systems in quantum and statistical physics is considered. For the multiple functional integrals with respect to Gaussian measures in the full separable metric spaces the new approximation formulas exact on a class of polynomial functionals of a given summary degree are constructed. The use of the formulas is demonstrated on example of computation of the Green function and the ground state energy in multidimensional Calogero model. 15 refs.; 2 tabs

Numerical and experimental modelling of the centrifugal compressor stage - setting the model of impellers with 2D blades

Science.gov (United States)

Matas, Richard; Syka, Tomáš; Luňáček, Ondřej

The article deals with a description of results from research and development of a radial compressor stage. The experimental compressor and used numerical models are briefly described. In the first part, the comparisons of characteristics obtained experimentally and by numerical simulations for stage with vaneless diffuser are described. In the second part, the results for stage with vanned diffuser are presented. The results are relevant for next studies in research and development process.

The instanton method and its numerical implementation in fluid mechanics

Science.gov (United States)

Grafke, Tobias; Grauer, Rainer; Schäfer, Tobias

2015-08-01

A precise characterization of structures occurring in turbulent fluid flows at high Reynolds numbers is one of the last open problems of classical physics. In this review we discuss recent developments related to the application of instanton methods to turbulence. Instantons are saddle point configurations of the underlying path integrals. They are equivalent to minimizers of the related Freidlin-Wentzell action and known to be able to characterize rare events in such systems. While there is an impressive body of work concerning their analytical description, this review focuses on the question on how to compute these minimizers numerically. In a short introduction we present the relevant mathematical and physical background before we discuss the stochastic Burgers equation in detail. We present algorithms to compute instantons numerically by an efficient solution of the corresponding Euler-Lagrange equations. A second focus is the discussion of a recently developed numerical filtering technique that allows to extract instantons from direct numerical simulations. In the following we present modifications of the algorithms to make them efficient when applied to two- or three-dimensional (2D or 3D) fluid dynamical problems. We illustrate these ideas using the 2D Burgers equation and the 3D Navier-Stokes equations.

The instanton method and its numerical implementation in fluid mechanics

International Nuclear Information System (INIS)

Grafke, Tobias; Grauer, Rainer; Schäfer, Tobias

2015-01-01

A precise characterization of structures occurring in turbulent fluid flows at high Reynolds numbers is one of the last open problems of classical physics. In this review we discuss recent developments related to the application of instanton methods to turbulence. Instantons are saddle point configurations of the underlying path integrals. They are equivalent to minimizers of the related Freidlin–Wentzell action and known to be able to characterize rare events in such systems. While there is an impressive body of work concerning their analytical description, this review focuses on the question on how to compute these minimizers numerically. In a short introduction we present the relevant mathematical and physical background before we discuss the stochastic Burgers equation in detail. We present algorithms to compute instantons numerically by an efficient solution of the corresponding Euler–Lagrange equations. A second focus is the discussion of a recently developed numerical filtering technique that allows to extract instantons from direct numerical simulations. In the following we present modifications of the algorithms to make them efficient when applied to two- or three-dimensional (2D or 3D) fluid dynamical problems. We illustrate these ideas using the 2D Burgers equation and the 3D Navier–Stokes equations. (topical review)

El rol de las ONG de España en el internacionalización de la causa de las Damas de Blanco. Estudio de caso: Solidaridad Española con Cuba (2005-2012)

OpenAIRE

Tenjo Montes, Jineth Milena

2014-01-01

El interés de este estudio de caso es demostrar el rol de la ONG Solidaridad Española con Cuba en la creación de una red transnacional de defensa de las Damas de Blanco, un movimiento social cubano disidente. Esto, tras reconocer que el apoyo por parte de ésta y otras organizaciones e instituciones internacionales es de gran importancia para lograr las reivindicaciones sociales propuestas por las Damas de Blanco, a partir de los hechos ocurridos en la Primavera Negra en el año 2003. Tanto las...

El nuevo rol del docente universitario y su formación en relación con las TIC en contextos colaborativos B-Learning. Facultades de Educación y/o Tecnología

OpenAIRE

Valero Rueda, Esperanza

2016-01-01

[ES] Hemos realizado un recorrido a través de esta tesis, para identificar las competencias pedagógicas y tecnológicas que además del conocimiento y experiencia acerca de su disciplina el docente universitario desarrolle un rol protagónico en las transformaciones de los sistemas educativos permitiendo la consolidación del concepto de desarrollo profesional que se refiere, a las acciones ejecutadas por el docente en su proceso de formación posibilitando su desempeño profesional, supone ¿un pro...

Advanced experimental and numerical techniques for cavitation erosion prediction

CERN Document Server

Chahine, Georges; Franc, Jean-Pierre; Karimi, Ayat

2014-01-01

This book provides a comprehensive treatment of the cavitation erosion phenomenon and state-of-the-art research in the field. It is divided into two parts. Part 1 consists of seven chapters, offering a wide range of computational and experimental approaches to cavitation erosion. It includes a general introduction to cavitation and cavitation erosion, a detailed description of facilities and measurement techniques commonly used in cavitation erosion studies, an extensive presentation of various stages of cavitation damage (including incubation and mass loss), and insights into the contribution of computational methods to the analysis of both fluid and material behavior. The proposed approach is based on a detailed description of impact loads generated by collapsing cavitation bubbles and a physical analysis of the material response to these loads. Part 2 is devoted to a selection of nine papers presented at the International Workshop on Advanced Experimental and Numerical Techniques for Cavitation Erosion (Gr...

Optimal Homogenization of Perfusion Flows in Microfluidic Bio-Reactors: A Numerical Study

DEFF Research Database (Denmark)

Okkels, Fridolin; Dufva, Martin; Bruus, Henrik

2011-01-01

In recent years, the interest in small-scale bio-reactors has increased dramatically. To ensure homogeneous conditions within the complete area of perfused microfluidic bio-reactors, we develop a general design of a continually feed bio-reactor with uniform perfusion flow. This is achieved...... by introducing a specific type of perfusion inlet to the reaction area. The geometry of these inlets are found using the methods of topology optimization and shape optimization. The results are compared with two different analytic models, from which a general parametric description of the design is obtained...... and tested numerically. Such a parametric description will generally be beneficial for the design of a broad range of microfluidic bioreactors used for, e. g., cell culturing and analysis and in feeding bio-arrays....

Numerical simulation of draft tube flow of a bulb turbine

Energy Technology Data Exchange (ETDEWEB)

Coelho, J.G. [Federal University of Triangulo Mineiro, Institute of Technological and Exact Sciences, Avenida Doutor Randolfo Borges Junior, 1250 – Uberaba – MG (Brazil); Brasil, A.C.P. Jr. [University of Brasilia, Department of Mechanical Engineering, Campus Darcy Ribeiro, Brasilia – DF (Brazil)

2013-07-01

In this work a numerical study of draft tube of a bulb hydraulic turbine is presented, where a new geometry is proposed. This new proposal of draft tube has the unaffected ratio area, a great reduction in his length and approximately the same efficiency of the draft tube conventionally used. The numerical simulations were obtained in commercial software of calculation of flow (CFX-14), using the turbulence model SST, that allows a description of the field fluid dynamic near to the wall. The simulation strategy has an intention of identifying the stall of the boundary layer precisely limits near to the wall and recirculations in the central part, once those are the great causes of the decrease of efficiency of a draft tube. Finally, it is obtained qualitative and quantitative results about the flow in draft tubes.

Influencia de la hipoxia sobre el metabolismo óseo: rol central del factor inducible por hipoxia

Directory of Open Access Journals (Sweden)

Elías Ernesto Aguirre Siancas

2013-10-01

Full Text Available El conocimiento de la influencia de la hipoxia sobre la fisiología humana dio un salto cualitativo cuando se descubrió al factor inducible por hipoxia (HIF. Las vías moleculares que este factor de transcripción regula son variadas y complejas, cuya comprensión continuamente se sigue profundizando. En la fisiología y en la fisiopatología del tejido óseo se desarrollan varios procesos característicos, como la osificación, la remodelación y la reparación. La disminución en la disposición de oxígeno determina la estabilización del HIF en muchos grupos celulares, entre los cuales destacan las células del linaje osteogénico. Este factor regula la expresión de múltiples genes, siendo, quizás, el más importante el que codifica al factor de crecimiento vascular del endotelio (VEGF, debido a su decisiva implicancia en el proceso de osteogénesis, directamente activando a las células osteoblásticas o indirectamente mediante su potente acción angiogénica. En este artículo, se hace una revisión actualizada sobre el rol central del HIF sobre la fisiología ósea, detallando la regulación de las principales vías moleculares dependientes de dicho factor de transcripción.

Reflection on the role of the Dutch government in sustainable supply chains. New phase in the transition of sustainable products; Reflectie op rol overheid bij verduurzaming productketens. Nieuwe fase in transitie naar duurzame producten

Energy Technology Data Exchange (ETDEWEB)

Vermeulen, W. [Copernicus Instituut voor Duurzame Ontwikkeling en Innovatie, Universiteit Utrecht, Utrecht (Netherlands); Kok, M.; Van Oorschot, M. [Planbureau voor de Leefomgeving PBL, Den Haag (Netherlands)

2011-03-15

This article is based on an exploratory study which analyses some of the earliest multi-actor sustainable supply chain governance systems in order to answer the key research questions: Which strategies and instruments do governments - national and supranational - apply in advancing sustainable production and consumption in global supply chains; and What is known about the effectiveness of these strategies and instruments? The study focuses on two supply chains with the longest history of addressing imports from developing countries (tropical timber and coffee). These two supply chains are compared with two supply chains that are gaining increasing attention: - cocoa and tea. The study shows that the two most 'mature' global sustainable supply chains are market led in issuing voluntary certification and that buying certified products is starting to become mainstream and increasingly effective. The sustainable supply chains for tea and cocoa are more recent developments but may develop faster because of the lessons learnt in sustainable supply chains developed earlier. [Dutch] Het marktaandeei van meerdere duurzame producten is inmiddels het nichestadium ontstegen. Die verduurzaming wordt door de overheid primair gezien als een verantwoordelijkheid van de maatschappelijke partners (bedrijfsleven, burgers en belangenorganisaties). Hierbij speelt de overheid slechts een begeleidende rol vanuit de zijlijn. Naarmate de marktaandelen verder toenemen is vanwege tekortkomingen in de markt reflectie op die rol nodig. Als illustratie wordt in dit artikel ingegaan op ontwikkelingen in twee productketens: koffie en hout.

CHEMSIMUL - A program package for numerical simulation of chemical reaction systems

International Nuclear Information System (INIS)

Lang Rasmussen, O.; Bjergbakke, E.

1984-01-01

A description is given of a program package, CHEMSIMUL, for numerical simulation of chemical reaction systems. The main components in the package are a translator of chemical equations to differential equations, a balance equation program, a differential equation solver, EPISODE, and an input/output program. The performance of the program is demonstrated by four examples. A manual for the input file and the complete program text with comments are given in Appendices I and II. (author)

El efecto del job crafting y el rol mediador del burnout y el engagement sobre la relación entre las características laborales y la intención de rotar

OpenAIRE

Lazarte Aranguren, Luis Antonio

2016-01-01

El propósito de esta investigación es determinar el efecto del job crafting sobre la intención de rotar, así como comprobar el rol mediador del burnout y el engagement sobre las relaciones entre las demandas y recursos laborales respectivamente y la intención de rotar dentro de empresas de call center de Lima-Perú. Para ello, se plantearon tres hipótesis de investigación. En primer lugar, se empleó la definición de intención de rotar de Mobley et al. (1978) en el marco del modelo de demandas ...

Site investigations: Strategy for rock mechanics site descriptive model

International Nuclear Information System (INIS)

Andersson, Johan; Christiansson, Rolf; Hudson, John

2002-05-01

As a part of the planning work for the Site Investigations, SKB has developed a Rock Mechanics Site Descriptive Modelling Strategy. Similar strategies are being developed for other disciplines. The objective of the strategy is that it should guide the practical implementation of evaluating site specific data during the Site Investigations. It is also understood that further development may be needed. This methodology enables the crystalline rock mass to be characterised in terms of the quality at different sites, for considering rock engineering constructability, and for providing the input to numerical models and performance assessment calculations. The model describes the initial stresses and the distribution of deformation and strength properties of the intact rock, of fractures and fracture zones, and of the rock mass. The rock mass mechanical properties are estimated by empirical relations and by numerical simulations. The methodology is based on estimation of mechanical properties using both empirical and heroretical/numerical approaches; and estimation of in situ rock stress using judgement and numerical modelling, including the influence of fracture zones. These approaches are initially used separately, and then combined to produce the required characterisation estimates. The methodology was evaluated with a Test Case at the Aespoe Hard Rock Laboratory in Sweden. The quality control aspects are an important feature of the methodology: these include Protocols to ensure the structure and coherence of the procedures used, regular meetings to enhance communication, feedback from internal and external reviewing, plus the recording of an audit trail of the development steps and decisions made. The strategy will be reviewed and, if required, updated as appropriate

Site investigations: Strategy for rock mechanics site descriptive model

Energy Technology Data Exchange (ETDEWEB)

Andersson, Johan [JA Streamflow AB, Aelvsjoe (Sweden); Christiansson, Rolf [Swedish Nuclear Fuel and Waste Management Co., Stockholm (Sweden); Hudson, John [Rock Engineering Consultants, Welwyn Garden City (United Kingdom)

2002-05-01

As a part of the planning work for the Site Investigations, SKB has developed a Rock Mechanics Site Descriptive Modelling Strategy. Similar strategies are being developed for other disciplines. The objective of the strategy is that it should guide the practical implementation of evaluating site specific data during the Site Investigations. It is also understood that further development may be needed. This methodology enables the crystalline rock mass to be characterised in terms of the quality at different sites, for considering rock engineering constructability, and for providing the input to numerical models and performance assessment calculations. The model describes the initial stresses and the distribution of deformation and strength properties of the intact rock, of fractures and fracture zones, and of the rock mass. The rock mass mechanical properties are estimated by empirical relations and by numerical simulations. The methodology is based on estimation of mechanical properties using both empirical and heroretical/numerical approaches; and estimation of in situ rock stress using judgement and numerical modelling, including the influence of fracture zones. These approaches are initially used separately, and then combined to produce the required characterisation estimates. The methodology was evaluated with a Test Case at the Aespoe Hard Rock Laboratory in Sweden. The quality control aspects are an important feature of the methodology: these include Protocols to ensure the structure and coherence of the procedures used, regular meetings to enhance communication, feedback from internal and external reviewing, plus the recording of an audit trail of the development steps and decisions made. The strategy will be reviewed and, if required, updated as appropriate.

Conceptual clustering and its relation to numerical taxonomy

International Nuclear Information System (INIS)

Fisher, D.; Langley, P.

1986-01-01

Artificial Intelligence (AI) methods for machine learning can be viewed as forms of exploratory data analysis, even though they differ markedly from the statistical methods generally connoted by the term. The distinction between methods of machine learning and statistical data analysis is primarily due to differences in the way techniques of each type represent data and structure within data. That is, methods of machine learning are strongly biased toward symbolic (as opposed to numeric) data representations. The authors explore this difference within a limited context, devoting the bulk of our chapter to the explication of conceptual clustering, an extension to the statistically based methods of numerical taxonomy. In conceptual clustering the formation of object cluster is dependent on the quality of 'higher level' characterization, termed concepts, of the clusters. The form of concepts used by existing conceptual clustering systems (sets of necessary and sufficient conditions) is described in some detail. This is followed by descriptions of several conceptual clustering techniques, along with sample output. They conclude with a discussion of how alternative concept representations might enhance the effectiveness of future conceptual clustering systems

Thermal Site Descriptive Model. A strategy for the model development during site investigations. Version 1.0

International Nuclear Information System (INIS)

Sundberg, Jan

2003-04-01

Site investigations are in progress for the siting of a deep repository for spent nuclear fuel. As part of the planning work, strategies are developed for site descriptive modelling regarding different disciplines, amongst them the thermal conditions. The objective of the strategy for a thermal site descriptive model is to guide the practical implementation of evaluating site specific data during the site investigations. It is understood that further development may be needed. The model describes the thermal properties and other thermal parameters of intact rock, fractures and fracture zones, and of the rock mass. The methodology is based on estimation of thermal properties of intact rock and discontinuities, using both empirical and theoretical/numerical approaches, and estimation of thermal processes using mathematical modelling. The methodology will be used and evaluated for the thermal site descriptive modelling at the Aespoe Hard Rock Laboratory

GITTAM program for numerical simulation of one-dimensional targets TIS. Part 2

International Nuclear Information System (INIS)

Arpishkin, Yu.P.; Basko, M.M.; Sokolovskij, M.V.

1989-01-01

A finite-difference algorithm for numeric solution of a system of one-dimensional hydrodynamics equation with heat conductivity, radiation diffusion and thermonuclear combustion is considered. The algorithm presented allows one to simulate one-dimensional thermonuclear targets for heavy-ion synthesis (HIS), irradiated with heavy ion beams. A brief description of a complex of GITTAM programs in which finite-difference algorithm for one-dimensional thermonuclear HIS target simulation is used, is given. 5 refs.; 3 figs

Numerical simulation of effective mechanical properties of stochastic composites with consideration for structural evolution under intensive dynamic loading

Energy Technology Data Exchange (ETDEWEB)

Karakulov, Valerii V., E-mail: valery@ftf.tsu.ru [National Research Tomsk State University, Tomsk, 634050 (Russian Federation); Smolin, Igor Yu., E-mail: smolin@ispms.ru, E-mail: skrp@ftf.tsu.ru; Skripnyak, Vladimir A., E-mail: smolin@ispms.ru, E-mail: skrp@ftf.tsu.ru [National Research Tomsk State University, Tomsk, 634050, Russia and Institute of Strength Physics and Materials Science SB RAS, Tomsk, 634055 (Russian Federation)

2014-11-14

Mechanical behavior of stochastic metal-ceramic composites with the aluminum matrix under high-rate deformation at shock-wave loading is numerically simulated with consideration for structural evolution. Effective values of mechanical parameters of metal-ceramic composites Aldescription='Single-Bond' name='Single-Bond' value='Single-Bond'/>B{sub 4}C, Aldescription='Single-Bond' name='Single-Bond' value='Single-Bond'/>SiC, and Aldescription='Single-Bond' name='Single-Bond' value='Single-Bond'/>Al{sub 2}O{sub 3} are evaluated depending on different concentration of ceramic inclusions.

Descriptive catalogue of radioactive waste families; Catalogue descriptif des familles de dechets radioactifs

Energy Technology Data Exchange (ETDEWEB)

NONE

2004-07-01

This document describes the different types of radioactive wastes produced in France or which are expected to be produced in the future. The wastes have been shared into different families having similar characteristics. A description is made for each family: general presentation, photos, position of the family in the French classification, industrial origin, status of production. Some informations about the raw waste and its conditioning process are also given. The qualitative description is completed by some numerical data like: the quantity produced in the past and to be produced in the future, the evaluation of the radioactivity in 2002 and 2020, and the evaluation of the thermal power when it exists. Finally, some informations are given about the risk of toxicity of some chemical species or compounds. (J.S.)

A program for the numerical control of a pulse increment system

Energy Technology Data Exchange (ETDEWEB)

Gray, D.C.

1963-08-21

This report will describe the important features of the development of magnetic tapes for the numerical control of a pulse-increment system consisting of a modified Gorton lathe and its associated control unit developed by L. E. Foley of Equipment Development Service, Engineering Services, General Electric Co., Schenectady, N.Y. Included is a description of CUPID (Control and Utilization of Pulse Increment Devices), a FORTRAN program for the design of these tapes on the IBM 7090 computer, and instructions for its operation.

Descriptive statistics: the specification of statistical measures and their presentation in tables and graphs. Part 7 of a series on evaluation of scientific publications.

Science.gov (United States)

Spriestersbach, Albert; Röhrig, Bernd; du Prel, Jean-Baptist; Gerhold-Ay, Aslihan; Blettner, Maria

2009-09-01

Descriptive statistics are an essential part of biometric analysis and a prerequisite for the understanding of further statistical evaluations, including the drawing of inferences. When data are well presented, it is usually obvious whether the author has collected and evaluated them correctly and in keeping with accepted practice in the field. Statistical variables in medicine may be of either the metric (continuous, quantitative) or categorical (nominal, ordinal) type. Easily understandable examples are given. Basic techniques for the statistical description of collected data are presented and illustrated with examples. The goal of a scientific study must always be clearly defined. The definition of the target value or clinical endpoint determines the level of measurement of the variables in question. Nearly all variables, whatever their level of measurement, can be usefully presented graphically and numerically. The level of measurement determines what types of diagrams and statistical values are appropriate. There are also different ways of presenting combinations of two independent variables graphically and numerically. The description of collected data is indispensable. If the data are of good quality, valid and important conclusions can already be drawn when they are properly described. Furthermore, data description provides a basis for inferential statistics.

Description of a stable scheme for steady-state coupled Monte Carlo–thermal–hydraulic calculations

International Nuclear Information System (INIS)

Dufek, Jan; Eduard Hoogenboom, J.

2014-01-01

Highlights: • A stable coupling scheme for steady-state MC–TH calculations is described. • The coupling scheme is based on the stochastic approximation method. • The neutron flux (or power) distribution is relaxed using a variable step-size. - Abstract: We provide a detailed description of a numerically stable and efficient coupling scheme for steady-state Monte Carlo neutronic calculations with thermal–hydraulic feedback. While we have previously derived and published the stochastic approximation based method for coupling the Monte Carlo criticality and thermal–hydraulic calculations, its possible implementation has not been described in a step-by-step manner. As the simple description of the coupling scheme was repeatedly requested from us, we have decided to make it available via this note

Numerical relativity

International Nuclear Information System (INIS)

Piran, T.

1982-01-01

There are many recent developments in numerical relativity, but there remain important unsolved theoretical and practical problems. The author reviews existing numerical approaches to solution of the exact Einstein equations. A framework for classification and comparison of different numerical schemes is presented. Recent numerical codes are compared using this framework. The discussion focuses on new developments and on currently open questions, excluding a review of numerical techniques. (Auth.)

Numerical and experimental modelling of the centrifugal compressor stage – setting the model of impellers with 2D blades

Directory of Open Access Journals (Sweden)

Matas Richard

2017-01-01

Full Text Available The article deals with a description of results from research and development of a radial compressor stage. The experimental compressor and used numerical models are briefly described. In the first part, the comparisons of characteristics obtained experimentally and by numerical simulations for stage with vaneless diffuser are described. In the second part, the results for stage with vanned diffuser are presented. The results are relevant for next studies in research and development process.

Active Vertex Model for cell-resolution description of epithelial tissue mechanics.

Science.gov (United States)

Barton, Daniel L; Henkes, Silke; Weijer, Cornelis J; Sknepnek, Rastko

2017-06-01

We introduce an Active Vertex Model (AVM) for cell-resolution studies of the mechanics of confluent epithelial tissues consisting of tens of thousands of cells, with a level of detail inaccessible to similar methods. The AVM combines the Vertex Model for confluent epithelial tissues with active matter dynamics. This introduces a natural description of the cell motion and accounts for motion patterns observed on multiple scales. Furthermore, cell contacts are generated dynamically from positions of cell centres. This not only enables efficient numerical implementation, but provides a natural description of the T1 transition events responsible for local tissue rearrangements. The AVM also includes cell alignment, cell-specific mechanical properties, cell growth, division and apoptosis. In addition, the AVM introduces a flexible, dynamically changing boundary of the epithelial sheet allowing for studies of phenomena such as the fingering instability or wound healing. We illustrate these capabilities with a number of case studies.

El rol de las alianzas entre misioneros e indígenas en la conquista de Apolobamba (siglos XVI-XVII

Directory of Open Access Journals (Sweden)

Santamaría, Daniel J

2006-08-01

Full Text Available This article shows the role accomplished by political alliances between catholic orders and indigenous groups during the Spanish conquest of the Apolobamba high forests. This was an alternative way to set missions positions and power spaces in front of the military State advance. Furthermore, this strategy shows that catholic orders did not form a compact block neither with the State nor with more or less irregular troops which entered to Apolobamba from the middle sixteenth century, as they looked indeed at any moment for their own autonomy based on indigenous consensus.

Este artículo demuestra el rol que cumplieron en la ocupación española de las selvas de Apolobamba las alianzas políticas entre órdenes religiosas y grupos aborígenes, como modo alternativo de fijar posiciones y espacios de poder frente al avance militar oficial. Esta estrategia demuestra a la vez que las órdenes no formaron un bloque compacto con el estado ni con las tropas más o menos irregulares que penetraron Apolobamba desde mediados del siglo XVI, sino que aspiraron en todo momento a su propia autonomía mediante el logro del consenso indígena.

Strategy for a Rock Mechanics Site Descriptive Model. Development and testing of the theoretical approach

Energy Technology Data Exchange (ETDEWEB)

Staub, Isabelle; Fredriksson, Anders; Outters, Nils [Golder Associates AB, Uppsala (Sweden)

2002-05-01

In the purpose of studying the possibilities of a Deep Repository for spent fuel, the Swedish Nuclear and Fuel Management Company (SKB) is currently planning for Site Investigations. Data collected from these Site Investigations are interpreted and analysed to achieve the full Site Description, which is built up of models from all the disciplines that are considered of importance for the Site Description. One of these models is the Rock Mechanical Descriptive Model,which would be developed for any site in hard crystalline rock, and is a combination and evaluation of the characterisation of rock mass by means of empirical relationships and a theoretical approach based on numerical modelling. The present report describes the theoretical approach. The characterisation of the mechanical properties of the rock mass, viewed as a unit consisting of intact rock and fractures, is achieved by numerical simulations with following input parameters: initial stresses, fracture geometry, distribution of rock mechanical properties, such as deformation and strength parameters, for the intact rock and for the fractures. The numerical modelling was performed with the two-dimensional code UDEC, and the rock block models were generated from 2D trace sections extracted from the 3D Discrete Fracture Network (DFN) model. Assumptions and uncertainties related to the set-up of the model are considered. The numerical model was set-up to simulate a plain strain-loading test. Different boundary conditions were applied on the model for simulating stress conditions (I) in the undisturbed rock mass, and (II) at the proximity of a tunnel. In order to assess the reliability of the model sensitivity analyses have been conducted on some rock block models for defining the dependency of mechanical properties to in situ stresses, the influence of boundary conditions, rock material and joint constitutive models used to simulate the behaviour of intact rock and fractures, domain size and anisotropy. To

Strategy for a Rock Mechanics Site Descriptive Model. Development and testing of the theoretical approach

International Nuclear Information System (INIS)

Staub, Isabelle; Fredriksson, Anders; Outters, Nils

2002-05-01

In the purpose of studying the possibilities of a Deep Repository for spent fuel, the Swedish Nuclear and Fuel Management Company (SKB) is currently planning for Site Investigations. Data collected from these Site Investigations are interpreted and analysed to achieve the full Site Description, which is built up of models from all the disciplines that are considered of importance for the Site Description. One of these models is the Rock Mechanical Descriptive Model,which would be developed for any site in hard crystalline rock, and is a combination and evaluation of the characterisation of rock mass by means of empirical relationships and a theoretical approach based on numerical modelling. The present report describes the theoretical approach. The characterisation of the mechanical properties of the rock mass, viewed as a unit consisting of intact rock and fractures, is achieved by numerical simulations with following input parameters: initial stresses, fracture geometry, distribution of rock mechanical properties, such as deformation and strength parameters, for the intact rock and for the fractures. The numerical modelling was performed with the two-dimensional code UDEC, and the rock block models were generated from 2D trace sections extracted from the 3D Discrete Fracture Network (DFN) model. Assumptions and uncertainties related to the set-up of the model are considered. The numerical model was set-up to simulate a plain strain-loading test. Different boundary conditions were applied on the model for simulating stress conditions (I) in the undisturbed rock mass, and (II) at the proximity of a tunnel. In order to assess the reliability of the model sensitivity analyses have been conducted on some rock block models for defining the dependency of mechanical properties to in situ stresses, the influence of boundary conditions, rock material and joint constitutive models used to simulate the behaviour of intact rock and fractures, domain size and anisotropy. To

NUMERICAL MODELLING OF THE SOIL BEHAVIOUR BY USING NEWLY DEVELOPED ADVANCED MATERIAL MODEL

Directory of Open Access Journals (Sweden)

Jan Veselý

2017-02-01

Full Text Available This paper describes a theoretical background, implementation and validation of the newly developed Jardine plastic hardening-softening model (JPHS model, which can be used for numerical modelling of the soils behaviour. Although the JPHS model is based on the elasto-plastic theory, like the Mohr-Coulomb model that is widely used in geotechnics, it contains some improvements, which removes the main disadvantages of the MC model. The presented model is coupled with an isotopically hardening and softening law, non-linear elastic stress-strain law, non-associated elasto-plastic material description and a cap yield surface. The validation of the model is done by comparing the numerical results with real measured data from the laboratory tests and by testing of the model on the real project of the tunnel excavation. The 3D numerical analysis is performed and the comparison between the JPHS, Mohr-Coulomb, Modified Cam-Clay, Hardening small strain model and monitoring in-situ data is done.

Numerical Analysis of Diaphragm Wall Model Executed in Poznań Clay Formation Applying Selected Fem Codes

Directory of Open Access Journals (Sweden)

Superczyńska M.

2016-09-01

Full Text Available The paper presents results of numerical calculations of a diaphragm wall model executed in Poznań clay formation. Two selected FEM codes were applied, Plaxis and Abaqus. Geological description of Poznań clay formation in Poland as well as geotechnical conditions on construction site in Warsaw city area were presented. The constitutive models of clay implemented both in Plaxis and Abaqus were discussed. The parameters of the Poznań clay constitutive models were assumed based on authors’ experimental tests. The results of numerical analysis were compared taking into account the measured values of horizontal displacements.

A sectionwise defined model for the material description of 100Cr6 in the thixotropic state

Science.gov (United States)

Behrens, B.-A.; Chugreev, A.; Hootak, M.

2018-05-01

A sectionwise defined material model has been developed for the numerical description of thixoforming processes. It consists of two sections. The first one describes the material behaviour below the solidus temperature and comprises an approach from structure mechanics, whereas the second section model describes the thixotropic behaviour above the solidus temperature based on the Ostwald-de Waele power law. The material model has been implemented in a commercial FE software Simufact Forming by means of user-defined subroutines. Numerical and experimental investigations of special upsetting tests have been designed and carried out with Armco iron-coated specimens. Finally, the model parameters were fitted by reverse engineering.

Numerical relativity

CERN Document Server

Shibata, Masaru

2016-01-01

This book is composed of two parts: First part describes basics in numerical relativity, that is, the formulations and methods for a solution of Einstein's equation and general relativistic matter field equations. This part will be helpful for beginners of numerical relativity who would like to understand the content of numerical relativity and its background. The second part focuses on the application of numerical relativity. A wide variety of scientific numerical results are introduced focusing in particular on the merger of binary neutron stars and black holes.

Numerical analysis

CERN Document Server

Khabaza, I M

1960-01-01

Numerical Analysis is an elementary introduction to numerical analysis, its applications, limitations, and pitfalls. Methods suitable for digital computers are emphasized, but some desk computations are also described. Topics covered range from the use of digital computers in numerical work to errors in computations using desk machines, finite difference methods, and numerical solution of ordinary differential equations. This book is comprised of eight chapters and begins with an overview of the importance of digital computers in numerical analysis, followed by a discussion on errors in comput

Description of surface systems. Preliminary site description. Forsmark area Version 1.2

Energy Technology Data Exchange (ETDEWEB)

Lindborg, Tobias [ed.

2005-06-01

Swedish Nuclear Fuel and Waste Management Co (SKB) started site investigations for a deep repository for spent nuclear fuel in 2002 at two different sites in Sweden, Forsmark and Oskarshamn. The investigations should provide necessary information for a license application aimed at starting underground exploration. For this reason, ecosystem data need to be interpreted and assessed into site descriptive models, which in turn are used for safety assessment studies and for environmental impact assessment. Descriptions of the surface system are also needed for further planning of the site investigations. This report describes the surface ecosystems of the Forsmark site (e.g. hydrology, Quaternary deposits, chemistry, vegetation, animals and the human land use). The ecosystem description is an integration of the site and its regional setting, covering the current state of the biosphere as well as the ongoing natural processes affecting the longterm development. Improving the descriptions is important during both the initial and the complete site investigation phase. Before starting of the initial phase in Forsmark, version 0 of the site descriptive model was developed. The results of the initial site investigation phase is compiled into a preliminary site description of Forsmark (version 1.2) in June 2005. This report provides the major input and background to the biosphere description, in the 1.2 version of the Forsmark site description. The basis for this interim version is quality-assured field data from the Forsmark sub area and regional area, available in the SKB SICADA, and GIS data bases as of July 31th 2004 as well as version 1.1 of the Site Descriptive Model. To achieve an ecosystem site description there is a need to develop discipline-specific models by interpreting and analysing primary data. The different discipline-specific models are then integrated into a system describing interactions and flows and stocks of matter between and within functional units in

Description of surface systems. Preliminary site description. Forsmark area Version 1.2

International Nuclear Information System (INIS)

Lindborg, Tobias

2005-06-01

Swedish Nuclear Fuel and Waste Management Co (SKB) started site investigations for a deep repository for spent nuclear fuel in 2002 at two different sites in Sweden, Forsmark and Oskarshamn. The investigations should provide necessary information for a license application aimed at starting underground exploration. For this reason, ecosystem data need to be interpreted and assessed into site descriptive models, which in turn are used for safety assessment studies and for environmental impact assessment. Descriptions of the surface system are also needed for further planning of the site investigations. This report describes the surface ecosystems of the Forsmark site (e.g. hydrology, Quaternary deposits, chemistry, vegetation, animals and the human land use). The ecosystem description is an integration of the site and its regional setting, covering the current state of the biosphere as well as the ongoing natural processes affecting the longterm development. Improving the descriptions is important during both the initial and the complete site investigation phase. Before starting of the initial phase in Forsmark, version 0 of the site descriptive model was developed. The results of the initial site investigation phase is compiled into a preliminary site description of Forsmark (version 1.2) in June 2005. This report provides the major input and background to the biosphere description, in the 1.2 version of the Forsmark site description. The basis for this interim version is quality-assured field data from the Forsmark sub area and regional area, available in the SKB SICADA, and GIS data bases as of July 31th 2004 as well as version 1.1 of the Site Descriptive Model. To achieve an ecosystem site description there is a need to develop discipline-specific models by interpreting and analysing primary data. The different discipline-specific models are then integrated into a system describing interactions and flows and stocks of matter between and within functional units in

Hardware description languages

Science.gov (United States)

Tucker, Jerry H.

1994-01-01

Hardware description languages are special purpose programming languages. They are primarily used to specify the behavior of digital systems and are rapidly replacing traditional digital system design techniques. This is because they allow the designer to concentrate on how the system should operate rather than on implementation details. Hardware description languages allow a digital system to be described with a wide range of abstraction, and they support top down design techniques. A key feature of any hardware description language environment is its ability to simulate the modeled system. The two most important hardware description languages are Verilog and VHDL. Verilog has been the dominant language for the design of application specific integrated circuits (ASIC's). However, VHDL is rapidly gaining in popularity.

Las empresas energéticas y la gran estrategia estadounidense hacia Irak : una reflexión sobre el rol de Exxon Mobil y Chevron como grupos económicos y de presión (2001- 2011)

OpenAIRE

Moreno Lara, Luisa Fernanda

2016-01-01

La monografía pretende explicar el rol desempeñado por Exxon Mobil y Chevron en la formulación de la Gran Estrategia del gobierno Bush hacia Irak. Especialmente, se sostiene que las dos compañías multinacionales mencionadas lograron que la intervención militar en Irak, fuera pensada como un objetivo fundamental de la política energética del gobierno Bush. Para lograr este objetivo, Chevron y Exxon aprovecharon principalmente su posición en la economía nacional estadounidense. De hecho, lograr...

Review of Project SAFE: Comments on biosphere conceptual model description and risk assessment methodology

International Nuclear Information System (INIS)

Klos, Richard; Wilmot, Roger

2002-09-01

The Swedish Nuclear Fuel and Waste Management Company's (SKB's) most recent assessment of the safety of the Forsmark repository for low-level and intermediate-level waste (Project SAFE) is currently undergoing review by the Swedish regulators. As part of its review, the Swedish Radiation Protection Institute (SSI) identified that two components of SAFE require more detailed review: (i) the conceptual model description of the biosphere system, and (ii) SKB's risk assessment methodology. We have reviewed the biosphere system interaction matrix and how this has been used in the identification, justification and description of biosphere models for radiological assessment purposes. The risk assessment methodology has been reviewed considering in particular issues associated with scenario selection, assessment timescale, and the probability and risk associated with the well scenario. There is an extensive range of supporting information on which biosphere modelling in Project SAFE is based. However, the link between this material and the biosphere models themselves is not clearly set out. This leads to some contradictions and mis-matches between description and implementation. One example concerns the representation of the geosphere-biosphere interface. The supporting description of lakes indicates that interaction between groundwaters entering the biosphere through lake bed sediments could lead to accumulations of radionuclides in sediments. These sediments may become agricultural areas at some time in the future. In the numerical modelling of the biosphere carried out in Project SAFE, the direct accumulation of contaminants in bed sediments is not represented. Application of a more rigorous procedure to ensure numerical models are fit for purpose is recommended, paying more attention to issues associated with the geosphere-biosphere interface. A more structured approach to risk assessment would be beneficial, with a better explanation of the difference between

Numerical study of non-ideal Vlasov-BGK plasmas

International Nuclear Information System (INIS)

Levchenko, V.D.; Sigov, Y.S.; Premuda, F.

1995-01-01

A relatively simple quasi-classical description of quantum plasmas using as first approximation the Bhatnagar-Gross-Krook (BGK) collision integral, if combined with the modern numerical simulation methods, might be effective tool of a deep study of non-ideal plasma kinetics in a variety of urgent applications as inertial confinement and cold fusion, transport and collective properties of highly condensed plasmas in liquid metals, semi- and superconductors and others. Consider one-dimensional degenerate plasma consisting of thermal electrons and thermal bosons (deuterons) in the vicinity of the equilibrium Fermi- and Bose-type distributions respectively. In the frame of our rough mixed model we solve Vlasov-BGK-Poisson eqs using simplified version of the SUR code

ZLIB++: Object-oriented numerical library for differential algebra

International Nuclear Information System (INIS)

Malitsky, N.; Reshetov, A.; Yan, Y.

1994-01-01

New software engineering tools and object-oriented design have a great impact on the software development process. But in high energy physics all major packages were implemented in FORTRAN and porting of these codes to another language is rather complicated, primarily because of their huge size and heavy use of FORTRAN mathematical libraries. But some intrinsic accelerator concepts, such as nested structure of modern accelerators, look very pretty when implemented with the object-oriented approach. In this paper we present the object-oriented version of ZLIB, numerical library for differential algebra and show how the modern approaches can simplify the development and support of accelerator codes, decrease code size, and allow description of complex mathematical transformations by simple language

Numeric computation and statistical data analysis on the Java platform

CERN Document Server

Chekanov, Sergei V

2016-01-01

Numerical computation, knowledge discovery and statistical data analysis integrated with powerful 2D and 3D graphics for visualization are the key topics of this book. The Python code examples powered by the Java platform can easily be transformed to other programming languages, such as Java, Groovy, Ruby and BeanShell. This book equips the reader with a computational platform which, unlike other statistical programs, is not limited by a single programming language. The author focuses on practical programming aspects and covers a broad range of topics, from basic introduction to the Python language on the Java platform (Jython), to descriptive statistics, symbolic calculations, neural networks, non-linear regression analysis and many other data-mining topics. He discusses how to find regularities in real-world data, how to classify data, and how to process data for knowledge discoveries. The code snippets are so short that they easily fit into single pages. Numeric Computation and Statistical Data Analysis ...

Global warming description using Daisyworld model with greenhouse gases.

Science.gov (United States)

Paiva, Susana L D; Savi, Marcelo A; Viola, Flavio M; Leiroz, Albino J K

2014-11-01

Daisyworld is an archetypal model of the earth that is able to describe the global regulation that can emerge from the interaction between life and environment. This article proposes a model based on the original Daisyworld considering greenhouse gases emission and absorption, allowing the description of the global warming phenomenon. Global and local analyses are discussed evaluating the influence of greenhouse gases in the planet dynamics. Numerical simulations are carried out showing the general qualitative behavior of the Daisyworld for different scenarios that includes solar luminosity variations and greenhouse gases effect. Nonlinear dynamics perspective is of concern discussing a way that helps the comprehension of the global warming phenomenon. Copyright © 2014 Elsevier Ireland Ltd. All rights reserved.

Averaged description of 3D MHD equilibrium

International Nuclear Information System (INIS)

Medvedev, S.Yu.; Drozdov, V.V.; Ivanov, A.A.; Martynov, A.A.; Pashekhonov, Yu.Yu.; Mikhailov, M.I.

2001-01-01

A general approach by S.A.Galkin et al. in 1991 to 2D description of MHD equilibrium and stability in 3D systems was proposed. The method requires a background 3D equilibrium with nested flux surfaces to generate the metric of a Riemannian space in which the background equilibrium is described by the 2D equation of Grad-Shafranov type. The equation can be solved then varying plasma profiles and shape to get approximate 3D equilibria. In the framework of the method both planar axis conventional stellarators and configurations with spatial magnetic axis can be studied. In the present report the formulation and numerical realization of the equilibrium problem for stellarators with planar axis is reviewed. The input background equilibria with nested flux surfaces are taken from vacuum magnetic field approximately described by analytic scalar potential

First description of leaf-mining Nepticulidae and Tischeriidae (Insecta, Lepidoptera) feeding on the Chilean endemic plant genus Podanthus Lag. (Asteraceae).

Science.gov (United States)

Stonis, Jonas R; Diškus, Arūnas; Remeikis, Andrius; Torres, Nixon Cumbicus

2016-01-05

Despite taxonomic and conservation interest in the Chilean endemic plant genus Podanthus Lag. (Asteraceae: subfamily Asteroideae, tribe Heliantheae), no Podanthus-feeding Nepticulidae or Tischeriidae have ever been recorded. Here, on the basis of material reared from Podanthus from central Mediterranean Chile, we present the description of Stigmella podanthae sp. nov. (Nepticulidae) and a re-description of Astrotischeria chilei Puplesis & Diškus, 2003. Females and host-plant of the latter species were previously unknown. Both treated species are illustrated with numerous photographs of the leaf-mines, adults of both sexes, and male and female genitalia.

Development of numerical Grids for UZ Flow and Transport Modeling

International Nuclear Information System (INIS)

P. Dobson

2004-01-01

This report describes the methods used to develop numerical grids of the unsaturated hydrogeologic system beneath Yucca Mountain, Nevada. Numerical grid generation is an integral part of the development of the unsaturated zone (UZ) flow and transport model, a complex, three-dimensional (3-D) model of Yucca Mountain. This revision contains changes made to improve the clarity of the description of grid generation. The numerical grids, developed using current geologic, hydrogeologic, and mineralogic data, provide the necessary framework to: (1) develop calibrated hydrogeologic property sets and flow fields, (2) test conceptual hypotheses of flow and transport, and (3) predict flow and transport behavior under a variety of climatic and thermal-loading conditions. The technical scope, content, and management for the current revision of this report are described in the planning document ''Technical Work Plan for: Unsaturated Zone Flow Analysis and Model Report Integration'' (BSC 2004 [DIRS 169654], Section 2). Grids generated and documented in this report supersede those documented in Revision 00 of this report, ''Development of Numerical Grids for UZ Flow and Transport Modeling'' (BSC 2001 [DIRS 159356]). The grids presented in this report are the same as those developed in Revision 01 (BSC 2003 [DIRS 160109]); however, the documentation of the development of the grids in Revision 02 has been updated to address technical inconsistencies and achieve greater transparency, readability, and traceability. The constraints, assumptions, and limitations associated with this report are discussed in the appropriate sections that follow

Rayleigh-Benard convection in a Hele-Shaw cell - a numerical study

International Nuclear Information System (INIS)

Guenther, C.; Mueller, U.

1987-05-01

Free convection in narrow vertical gaps heated from below gives rise to several different flow patterns as has been demonstrated by previous experimental investigations. A numerical study is presented aimed at simulating the observed flow phenomena in Hele-Shaw cells of small lateral extend. The numerical study is based on the assumption that the flow is essentially two-dimensional. This allows an approach using a one-term Galerkin approximation with respect to the direction perpendicular to the gap and a finite difference scheme with regard to the coordinates in the plane of the gap. The calculations result in realistic values of the critical Rayleigh numbers for the onset of steady and oscillatory convection. Most of the observed unsteady flow patterns can be simulated numerically. It is shown that five different stable flow patterns can occur at one particular Rayleigh number. The different stable flow patterns are coupled by a variety of complex transitions. Moreover the calculations show that a realistic description of the observed flow phenomena can not be obtained by a simplified model using the Darcy law in the momentum equation and implying slip flow at the small confining boundaries. (orig.) [de

Description of surface systems. Preliminary site description Simpevarp sub area - Version 1.2

Energy Technology Data Exchange (ETDEWEB)

Lindborg, Tobias [ed.

2005-03-01

Swedish Nuclear Fuel and Waste Management Co is currently conducting site characterisation in the Simpevarp area. The area is divided into two subareas, the Simpevarp and the Laxemar subarea. The two subareas are surrounded by a common regional model area, the Simpevarp area. This report describes both the regional area and the subareas. This report is an interim version (model version 1.2) of the description of the surface systems at the Simpevarp area, and should be seen as a background report to the site description of the Simpevarp area, version 1.2, SKB-R--05-08. The basis for this description is quality-assured field data available in the SKB SICADA and GIS databases, together with generic data from the literature. The Surface system, here defined as everything above the bedrock, comprises a number of separate disciplines (e.g. hydrology, geology, topography, oceanography and ecology). Each discipline has developed descriptions and models for a number of properties that together represent the site description. The current methodology for developing the surface system description and the integration to ecosystem models is documented in a methodology strategy report SKB-R--03-06. The procedures and guidelines given in that report were followed in this report. Compared with version 1.1 of the surface system description SKB-R--04-25, this report presents considerable additional features, especially in the ecosystem description (Chapter 4) and in the description of the surface hydrology (Section 3.4). A first attempt has also been made to connect the flow of matter (carbon) between the different ecosystems into an overall ecosystem model at a landscape level. A summarised version of this report is also presented in SKB-R--05-08 together with geological-, hydrogeological-, transport properties-, thermal properties-, rock mechanics- and hydrogeochemical descriptions.

Description of surface systems. Preliminary site description Simpevarp sub area - Version 1.2

International Nuclear Information System (INIS)

Lindborg, Tobias

2005-03-01

Swedish Nuclear Fuel and Waste Management Co is currently conducting site characterisation in the Simpevarp area. The area is divided into two subareas, the Simpevarp and the Laxemar subarea. The two subareas are surrounded by a common regional model area, the Simpevarp area. This report describes both the regional area and the subareas. This report is an interim version (model version 1.2) of the description of the surface systems at the Simpevarp area, and should be seen as a background report to the site description of the Simpevarp area, version 1.2, SKB-R--05-08. The basis for this description is quality-assured field data available in the SKB SICADA and GIS databases, together with generic data from the literature. The Surface system, here defined as everything above the bedrock, comprises a number of separate disciplines (e.g. hydrology, geology, topography, oceanography and ecology). Each discipline has developed descriptions and models for a number of properties that together represent the site description. The current methodology for developing the surface system description and the integration to ecosystem models is documented in a methodology strategy report SKB-R--03-06. The procedures and guidelines given in that report were followed in this report. Compared with version 1.1 of the surface system description SKB-R--04-25, this report presents considerable additional features, especially in the ecosystem description (Chapter 4) and in the description of the surface hydrology (Section 3.4). A first attempt has also been made to connect the flow of matter (carbon) between the different ecosystems into an overall ecosystem model at a landscape level. A summarised version of this report is also presented in SKB-R--05-08 together with geological-, hydrogeological-, transport properties-, thermal properties-, rock mechanics- and hydrogeochemical descriptions

THE DESIGN OF AXIAL PUMP ROTORS USING THE NUMERICAL METHODS

Directory of Open Access Journals (Sweden)

Ali BEAZIT

2010-06-01

Full Text Available The researches in rotor theory, the increasing use of computers and the connection between design and manufacturing of rotors, have determined the revaluation and completion of classical rotor geometry. This paper presents practical applications of mathematical description of rotor geometry. A program has been created to describe the rotor geometry for arbitrary shape of the blade. The results can be imported by GAMBIT - a processor for geometry with modeling and mesh generations, to create a mesh needed in hydrodynamics analysis of rotor CFD. The results obtained are applicable in numerical methods and are functionally convenient for CAD/CAM systems.

Numerical versus narrative: A comparison between methods to measure medical student performance during clinical clerkships.

Science.gov (United States)

Bartels, Josef; Mooney, Christopher John; Stone, Robert Thompson

2017-11-01

Medical school evaluations typically rely on both language-based narrative descriptions and psychometrically converted numeric scores to convey performance to the grading committee. We evaluated inter-rater reliability and correlation of numeric versus narrative evaluations for students on their Neurology Clerkship. 50 Neurology Clerkship in-training evaluation reports completed by their residents and faculty members at the University of Rochester School of Medicine were dissected into narrative and numeric components. 5 Clerkship grading committee members retrospectively gave new narrative scores (NNS) while blinded to original numeric scores (ONS). We calculated intra-class correlation coefficients (ICC) and their associated confidence intervals for the ONS and the NNS. In addition, we calculated the correlation between ONS and NNS. The ICC was greater for the NNS (ICC = .88 (95% CI = .70-.94)) than the ONS (ICC = .62 (95% CI = .40-.77)) Pearson correlation coefficient showed that the ONS and NNS were highly correlated (r = .81). Narrative evaluations converted by a small group of experienced graders are at least as reliable as numeric scoring by individual evaluators. We could allow evaluators to focus their efforts on creating richer narrative of greater value to trainees.

Guidelines for Description

NARCIS (Netherlands)

Links, P.; Horsman, Peter; Kühnel, Karsten; Priddy, M.; Reijnhoudt, Linda; Merenmies, Mark

2013-01-01

The Guidelines follow the conceptual metadata model (deliverable 17.2). They include guidelines for description of collection-holding institutions, document collections, organisations, personalities, events, camps and ghettos. As much as possible the guidelines comply with the descriptive standards

Numerical simulations of coupled problems in engineering

CERN Document Server

2014-01-01

This book presents and discusses mathematical models, numerical methods and computational techniques used for solving coupled problems in science and engineering. It takes a step forward in the formulation and solution of real-life problems with a multidisciplinary vision, accounting for all of the complex couplings involved in the physical description. Simulation of multifaceted physics problems is a common task in applied research and industry. Often a suitable solver is built by connecting together several single-aspect solvers into a network. In this book, research in various fields was selected for consideration: adaptive methodology for multi-physics solvers, multi-physics phenomena and coupled-field solutions, leading to computationally intensive structural analysis. The strategies which are used to keep these problems computationally affordable are of special interest, and make this an essential book.

Numerical modelling of solute transport at Forsmark with MIKE SHE. Site descriptive modelling SDM-Site Forsmark

Energy Technology Data Exchange (ETDEWEB)

Gustafsson, Lars-Goeran; Sassner, Mona (DHI Sverige AB, Stockholm (Sweden)); Bosson, Emma (Swedish Nuclear Fuel and Waste Management Co., Stockholm (Sweden))

2008-12-15

The Swedish Nuclear Fuel and Waste Management Company (SKB) is performing site investigations at two different locations in Sweden, referred to as the Forsmark and Laxemar areas, with the objective of siting a final repository for high-level radioactive waste. Data from the site investigations are used in a variety of modelling activities. This report presents model development and results of numerical transport modelling based on the numerical flow modelling of surface water and near-surface groundwater at the Forsmark site. The numerical modelling was performed using the modelling tool MIKE SHE and is based on the site data and conceptual model of the Forsmark areas. This report presents solute transport applications based on both particle tracking simulations and advection-dispersion calculations. The MIKE SHE model is the basis for the transport modelling presented in this report. Simulation cases relevant for the transport from a deep geological repository have been studied, but also the pattern of near surface recharge and discharge areas. When the main part of the modelling work presented in this report was carried out, the flow modelling of the Forsmark site was not finalised. Thus, the focus of this work is to describe the sensitivity to different transport parameters, and not to point out specific areas as discharge areas from a future repository (this is to be done later, within the framework of the safety assessment). In the last chapter, however, results based on simulations with the re-calibrated MIKE SHE flow model are presented. The results from the MIKE SHE water movement calculations were used by cycling the calculated transient flow field for a selected one-year period as many times as needed to achieve the desired simulation period. The solute source was located either in the bedrock or on top of the model. In total, 15 different transport simulation cases were studied. Five of the simulations were particle tracking simulations, whereas the rest

The structure concept in the description of mixing turbulence: the 2SFK model

International Nuclear Information System (INIS)

Llor, A.; Poujade, O.; Lardjane, N.

2009-01-01

To meet our modelling needs on turbulent flows produced by gravitational instabilities (of Rayleigh-Taylor or Richtmyer-Meshkov type), we have developed an original approach, designated as 2SFK for '2-structure, 2-fluid, 2-turbulent'. We provide the physical elements, theoretical, experimental, and numerical, which support this choice. A full description being out of question here, we give the principles of the model derivation, which hinges around an averaging conditioned by presence functions of the large structures in the flow, and discuss its distinctive properties compared to usual 'single-fluid' models. Numerical 1-dimension results on elementary flows illustrate the satisfactory behaviour of the model. All along this article, emphasis is given on the peculiar characteristics of turbulence in the Rayleigh-Taylor flow (possibly under variable acceleration): energy balance, characteristic size of large eddies, directed transport, enhanced diffusion, etc. (authors)

Descriptive statistics.

Science.gov (United States)

Nick, Todd G

2007-01-01

Statistics is defined by the Medical Subject Headings (MeSH) thesaurus as the science and art of collecting, summarizing, and analyzing data that are subject to random variation. The two broad categories of summarizing and analyzing data are referred to as descriptive and inferential statistics. This chapter considers the science and art of summarizing data where descriptive statistics and graphics are used to display data. In this chapter, we discuss the fundamentals of descriptive statistics, including describing qualitative and quantitative variables. For describing quantitative variables, measures of location and spread, for example the standard deviation, are presented along with graphical presentations. We also discuss distributions of statistics, for example the variance, as well as the use of transformations. The concepts in this chapter are useful for uncovering patterns within the data and for effectively presenting the results of a project.

Developing group investigation-based book on numerical analysis to increase critical thinking student’s ability

Science.gov (United States)

Maharani, S.; Suprapto, E.

2018-03-01

Critical thinking is very important in Mathematics; it can make student more understanding mathematics concept. Critical thinking is also needed in numerical analysis. The Numerical analysis's book is not yet including critical thinking in them. This research aims to develop group investigation-based book on numerical analysis to increase critical thinking student’s ability, to know the quality of the group investigation-based book on numerical analysis is valid, practical, and effective. The research method is Research and Development (R&D) with the subject are 30 student college department of Mathematics education at Universitas PGRI Madiun. The development model used is 4-D modified to 3-D until the stage development. The type of data used is descriptive qualitative data. Instruments used are sheets of validation, test, and questionnaire. Development results indicate that group investigation-based book on numerical analysis in the category of valid a value 84.25%. Students response to the books very positive, so group investigation-based book on numerical analysis category practical, i.e., 86.00%. The use of group investigation-based book on numerical analysis has been meeting the completeness criteria classical learning that is 84.32 %. Based on research result of this study concluded that group investigation-based book on numerical analysis is feasible because it meets the criteria valid, practical, and effective. So, the book can be used by every mathematics academician. The next research can be observed that book based group investigation in other subjects.

Kültürel Farklılıkların Yönetiminde İnsan Kaynakları Stratejilerinin Rolü : IKEA Örneği

OpenAIRE

Helvacıoğlu, Nuray; Özutku, Hatice

2010-01-01

Günümüzde işletmelerin küreselleşme eğilimleri, işgören çeşitliliğinin ve kültürel farklılıkların artmasına neden olmaktadır. İşletmelerin rekabet üstünlüğü elde edebilmeleri için kültürel farklılıkların etkin bir biçimde yönetilmesi gerekmektedir. Bu çalışmanın amacı, kültürel farklılıkların yönetiminde insan kaynakları yönetiminin rolünün belirlenmesidir. Bu kapsamda, kültürel farklılıkların yönetiminde ön plana çıkan İsveç kökeni IKEA firmasını konu alan nitel bir araş...

Unified description of perturbation theory and band center anomaly in one-dimensional Anderson localization

International Nuclear Information System (INIS)

Kang, Kai; Qin, Shaojing; Wang, Chuilin

2011-01-01

We calculated numerically the localization length of one-dimensional Anderson model with diagonal disorder. For weak disorder, we showed that the localization length changes continuously as the energy changes from the band center to the boundary of the anomalous region near the band edge. We found that all the localization lengths for different disorder strengths and different energies collapse onto a single curve, which can be fitted by a simple equation. Thus the description of the perturbation theory and the band center anomaly were unified into this equation. -- Highlights: → We study the band center anomaly of one-dimensional Anderson localization. → We study numerically the Lyapunov exponent through a parametrization method of the transfer matrix. → We give a unified equation to describe the band center anomaly and perturbation theory.

Numerical simulation of mass and energy transport phenomena in solid oxide fuel cells

Energy Technology Data Exchange (ETDEWEB)

Arpino, F. [Dipartimento di Meccanica, Strutture, Ambiente e Territorio (DiMSAT), University of Cassino, via Di Biasio 43, Cassino (Italy); Massarotti, N. [Dipertimento per le Tecnologie (DiT), University of Naples ' ' Parthenope' ' , Centro Direzionale, isola C4, 80143 Napoli (Italy)

2009-12-15

Solid Oxide Fuel Cells (SOFCs) represent a very promising technology for near future energy conversion thanks to a number of advantages, including the possibility of using different fuels. In this paper, a detailed numerical model, based on a general mathematical description and on a finite element Characteristic based Split (CBS) algorithm code is employed to simulate mass and energy transport phenomena in SOFCs. The model predicts the thermodynamic quantity of interest in the fuel cell. Full details of the numerical solution obtained are presented both in terms of heat and mass transfer in the cell and in terms of electro-chemical reactions that occur in the system considered. The results obtained with the present algorithm is compared with the experimental data available in the literature for validation, showing an excellent agreement. (author)

ZLIB++: Object Oriented Numerical Library for Differential Algebra

International Nuclear Information System (INIS)

Yan, Yiton T

2003-01-01

New software engineering tools and object-oriented design have a great impact on the software development process. but in high energy physics all major packages were implemented in FORTRAN and porting of these codes to another language is rather complicated, primarily because of their huge size and heavy use of FORTRAN mathematical libraries. But some intrinsic accelerator concepts, such as nested structure of modern accelerators, look very pretty when implemented with the object-oriented approach. In this paper the authors present the object-oriented version of ZLIB, numerical library for differential algebra, and show how the modern approaches can simplify the development and support of accelerator codes, decrease code size, and allow description of complex mathematical transformations by simple language

NAUA-Mod 3 - A computer code for the description of the aerosol behaviour in a condensing atmosphere

International Nuclear Information System (INIS)

Bunz, H.; Koyro, M.; Schoeck, W.

1981-09-01

This report gives a description of the computer code NAUA-Mod 3. Its purpose is to calculate the behaviour of a polydisperse aerosol system in the containment of a light water reactor after a postulated core meltdown accident as a function of the time. The most important effect being added to those already taken into account in comparable computer codes is the steam condensation onto the particles. In the report the equations taken as basis of the code are given and the physical processes they are derived from are explained. Another main objekt of the report is the description of the numerical methods used as well as the input and output of the code. (orig.) [de

Handbook of Manufacturing Control Fundamentals, description, configuration

CERN Document Server

Lödding, Hermann

2013-01-01

This first-time English publication of one of Germany’s leading manufacturing control handbooks provides a comprehensive overview of the state of the art, with detailed and easy to understand descriptions of numerous control techniques from Kanban to CONWIP to Backlog Control. Based on the proven funnel model and written for the industry, this book clearly illustrates how companies can use manufacturing control to effectively improve on-time delivery, reduce inventories and cut down throughput times. “This book distinguishes itself with its convincing systematic approach based on thorough international research. Its clear presentation and direct applicability for analysing and configuring the manufacturing control make this handbook an outstanding and unique publication on PPC.” Hans-Peter Wiendahl “The field of manufacturing control is very convincingly reviewed and presented from a theoretical and methodological perspective. Both researchers as well as practitioners will profit from it.” Peter N...

Descriptive set theory

CERN Document Server

Moschovakis, YN

1987-01-01

Now available in paperback, this monograph is a self-contained exposition of the main results and methods of descriptive set theory. It develops all the necessary background material from logic and recursion theory, and treats both classical descriptive set theory and the effective theory developed by logicians.

Toward Meaningful Manufacturing Variation Data in Design - Feature Based Description of Variation in Manufacturing Processes

DEFF Research Database (Denmark)

Eifler, Tobias; Boorla, Srinivasa Murthy; Howard, Thomas J.

2016-01-01

The need to mitigate the effects of manufacturing variation already in design is nowadays commonly acknowledged and has led to a wide use of predictive modeling techniques, tolerancing approaches, etc. in industry. The trustworthiness of corresponding variation analyses is, however, not ensured...... by the availability of sophisticated methods and tools alone, but does evidently also depend on the accuracy of the input information used. As existing approaches for the description of manufacturing variation focus however, almost exclusively, on monitoring and controlling production processes, there is frequently...... a lack of objective variation data in design. As a result, variation analyses and tolerancing activities rely on numerous assumptions made to fill the gaps of missing or incomplete data. To overcome this hidden subjectivity, a schema for a consistent and standardised description of manufacturing...

Numerical and graphical description on the ion motions in a Penning trap for mass measurements

International Nuclear Information System (INIS)

Sun, Y.L.; Tian, Y.L.; Huang, W.X.; Wang, J.Y.; Wang, Y.S.; Zhao, J.M.; Wang, Y.

2013-01-01

The ion motions in a Penning trap have been studied in detail in the presence of azimuthal dipolar and quadrupolar radio-frequency excitations and buffer gas cooling. The numerical solutions by using the Runge–Kutta method and thus the pictures of the ion trajectories in the trap have been obtained for different cases and summarized in graphical form. For the recentering of the ion of interest and to perform the purification of the ion species, one has to set a reasonable buffer gas pressure in the trap and apply azimuthal quadrupolar excitation at frequency ω rf =ω c . -- Highlights: • Azimuthal dipolar and quadrupolar rf excitations and buffer gas cooling. • Runge–Kutta method. • Pictures of the ion trajectories obtained and summarized in graphical form. • A reasonable buffer gas pressure should be set for recentering ions

El rol de la universidad en la prevención de la obesidad

Directory of Open Access Journals (Sweden)

Carlos Alfonso González-Gómez

2015-05-01

Full Text Available Introducción: La obesidad es la enfermedad crónica no transmisible más prevalente. El aumento de la prevalencia de esta enfermedad está asociado con la edad, razón por la cual los estudiantes universitarios son un grupo importante, el cual puede ser influenciado por programas de bienestar universitario. Materiales y Métodos: Articulo de reflexión, que discute las políticas colombianas y estrategias para la prevención de la obesidad y las enfermedades cardiovasculares. Resultados: Literatura muestra que hay puntos críticos aplicables en la prevención de la obesidad y las enfermedades cardiovasculares en la comunidad universitaria. Estos puntos incluyen pobre participación de prevención de universidades,  inadecuada articulación de sectores involucrados para resolver deficiencias del sistema y así esperar mejores desenlaces en la comunidad.  Discusión: Pese al conocimiento de estrategias que favorecen la actividad física en la población universitaria y población general, no hay una red articulada entre las universidades y el gobierno que permitan generar impacto en la prevención de enfermedad cardiovascular y obesidad. Se requiere participación de universidades (bienestar universitario, estudiantes y gobernantes para promover y ejecutar programas y políticas sostenibles a largo plazo. Conclusiones: Pese a la existencia de leyes y normas que regulan el bienestar universitario en Colombia, no existen intervenciones eficaces para la prevención de la obesidad. Se deben intervenir grupos en riesgo, así como adecuar espacios apropiados para la alimentación y realización de actividad física. Estas reformas implican la participación articulada de estudiantes, personal administrativo y líderes políticos, en coordinación con los centros de bienestar universitario.Cómo citar este artículo: González-Gómez CA, Camacho-Ruiz  JF, Barajas-Gamboa  JS. El rol de la universidad en la prevención de la obesidad. Rev Cuid

Description and Codification of Miscanthus × giganteus Growth Stages for Phenological Assessment

Directory of Open Access Journals (Sweden)

Mauricio D. Tejera

2017-10-01

Full Text Available Triploid Miscanthus × giganteus (Greef et Deu. ex Hodkinson et Renvoize is a sterile, perennial grass used for biomass production in temperate environments. While M. × giganteus has been intensively researched, a scale standardizing description of M. × giganteus morphological stages has not been developed. Here we provide such a scale by adapting the widely-used Biologische Bundesanstalt, Bundessortenamt, CHemische Industrie (BBCH scale and its corresponding numerical code to describe stages of morphological development in M. × giganteus using observations of the “Freedom” and “Illinois” clone in Iowa, USA. Descriptive keys with images are also presented. Because M. × giganteus plants overlap in the field, the scale was first applied to individual stems and then scaled up to assess plants or communities. Of the 10 principal growth stages in the BBCH system, eight were observed in M. × giganteus. Each principal stage was subdivided into secondary stages to enable a detailed description of developmental progression. While M. × giganteus does not have seed development stages, descriptions of those stages are provided to extend the scale to other Miscanthus genotypes. We present methods to use morphological development data to assess phenology by calculating the onset, duration, and abundance of each developmental stage. This scale has potential to harmonize previously described study-specific scales and standardize results across studies. Use of the precise staging presented here should more tightly constrain estimates of developmental parameters in crop models and increase the efficacy of timing-sensitive crop management practices like pest control and harvest.

Emergence of linear elasticity from the atomistic description of matter

Energy Technology Data Exchange (ETDEWEB)

Cakir, Abdullah, E-mail: acakir@ntu.edu.sg [Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University (Singapore); Pica Ciamarra, Massimo [Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University (Singapore); Dipartimento di Scienze Fisiche, CNR–SPIN, Università di Napoli Federico II, I-80126 Napoli (Italy)

2016-08-07

We investigate the emergence of the continuum elastic limit from the atomistic description of matter at zero temperature considering how locally defined elastic quantities depend on the coarse graining length scale. Results obtained numerically investigating different model systems are rationalized in a unifying picture according to which the continuum elastic limit emerges through a process determined by two system properties, the degree of disorder, and a length scale associated to the transverse low-frequency vibrational modes. The degree of disorder controls the emergence of long-range local shear stress and shear strain correlations, while the length scale influences the amplitude of the fluctuations of the local elastic constants close to the jamming transition.

An effective medium description of 'Swiss Rolls', a magnetic metamaterial

International Nuclear Information System (INIS)

Wiltshire, M C K; Pendry, J B; Williams, W; Hajnal, J V

2007-01-01

The 'Swiss Roll' metamaterial medium is well suited to operation in the radio frequency (RF) range, because it has a low resonant frequency and a strong magnetic response. Two prisms of this material, one hexagonal and one square, have been constructed and characterized both at the metamaterial's resonant frequency of 21.5 MHz and above it, where the effective permeability is strongly negative. A series of spatial resonances is observed in the field patterns on the surfaces of the prisms. Using an effective medium description, we have carried out both analytical and numerical modelling of the electromagnetic behaviour of the metamaterial, and find, within certain obvious limitations, extremely good agreement between the measured and modelled results

Emergence of linear elasticity from the atomistic description of matter

International Nuclear Information System (INIS)

Cakir, Abdullah; Pica Ciamarra, Massimo

2016-01-01

We investigate the emergence of the continuum elastic limit from the atomistic description of matter at zero temperature considering how locally defined elastic quantities depend on the coarse graining length scale. Results obtained numerically investigating different model systems are rationalized in a unifying picture according to which the continuum elastic limit emerges through a process determined by two system properties, the degree of disorder, and a length scale associated to the transverse low-frequency vibrational modes. The degree of disorder controls the emergence of long-range local shear stress and shear strain correlations, while the length scale influences the amplitude of the fluctuations of the local elastic constants close to the jamming transition.

Numerical modelling of solute transport at Forsmark with MIKE SHE. Site descriptive modelling SDM-Site Forsmark

International Nuclear Information System (INIS)

Gustafsson, Lars-Goeran; Sassner, Mona; Bosson, Emma

2008-12-01

The Swedish Nuclear Fuel and Waste Management Company (SKB) is performing site investigations at two different locations in Sweden, referred to as the Forsmark and Laxemar areas, with the objective of siting a final repository for high-level radioactive waste. Data from the site investigations are used in a variety of modelling activities. This report presents model development and results of numerical transport modelling based on the numerical flow modelling of surface water and near-surface groundwater at the Forsmark site. The numerical modelling was performed using the modelling tool MIKE SHE and is based on the site data and conceptual model of the Forsmark areas. This report presents solute transport applications based on both particle tracking simulations and advection-dispersion calculations. The MIKE SHE model is the basis for the transport modelling presented in this report. Simulation cases relevant for the transport from a deep geological repository have been studied, but also the pattern of near surface recharge and discharge areas. When the main part of the modelling work presented in this report was carried out, the flow modelling of the Forsmark site was not finalised. Thus, the focus of this work is to describe the sensitivity to different transport parameters, and not to point out specific areas as discharge areas from a future repository (this is to be done later, within the framework of the safety assessment). In the last chapter, however, results based on simulations with the re-calibrated MIKE SHE flow model are presented. The results from the MIKE SHE water movement calculations were used by cycling the calculated transient flow field for a selected one-year period as many times as needed to achieve the desired simulation period. The solute source was located either in the bedrock or on top of the model. In total, 15 different transport simulation cases were studied. Five of the simulations were particle tracking simulations, whereas the rest

Numerical analysis

CERN Document Server

Rao, G Shanker

2006-01-01

About the Book: This book provides an introduction to Numerical Analysis for the students of Mathematics and Engineering. The book is designed in accordance with the common core syllabus of Numerical Analysis of Universities of Andhra Pradesh and also the syllabus prescribed in most of the Indian Universities. Salient features: Approximate and Numerical Solutions of Algebraic and Transcendental Equation Interpolation of Functions Numerical Differentiation and Integration and Numerical Solution of Ordinary Differential Equations The last three chapters deal with Curve Fitting, Eigen Values and Eigen Vectors of a Matrix and Regression Analysis. Each chapter is supplemented with a number of worked-out examples as well as number of problems to be solved by the students. This would help in the better understanding of the subject. Contents: Errors Solution of Algebraic and Transcendental Equations Finite Differences Interpolation with Equal Intervals Interpolation with Unequal Int...

Description of a bacterium associated with redmouth disease of rainbow trout (Salmo gairdneri)

Science.gov (United States)

Ross, A.J.; Rucker, R.R.; Ewing, W.H.

1966-01-01

A description was given of a gram-negative, peritrichously flagellated, fermentative bacterium that was isolated on numerous occasions from kidney tissues of rainbow trout (Salmo gairdneri) afflicted with redmouth disease. Although the bacteria apparently were members of the family Enterobacteriaceae, it was impossible to determine their taxonomic position within the family with certainty. Hence it was recommended that their taxonomic position remain sub judice for the present. As a temporary designation RM bacterium was used. Redmouth disease was transmitted from infected to normal fish through the medium of water.

Cambios en las emociones y en las metáforas sobre el rol docente y del alumnado, del futuro profesorado de Ciencias de Secundaria, tras las prácticas de enseñanza

Directory of Open Access Journals (Sweden)

Lucía Mellado

2017-01-01

Full Text Available A través de un cuestionario de preguntas abiertas y de dibujos, se analiza la evolución de las metáforas personales y emocionales de una muestra de 31 profesores en formación de las especialidades de Física y Química, de Biología y Geología, y de Matemáticas del Máster Universitario en Formación del Profesorado en Educación Secundaria, durante el curso 2012/2013. Para el análisis de las metáforas se aplican cuatro categorías: conductistas-transmisivas, cognitivas-constructivistas, situadas y autorreferenciadas. Las emociones se clasifican en primarias o sociales y en positivas, negativas o neutras. Los resultados indican que la mayoría de los participantes fueron capaces de conceptualizar sus roles de profesor o profesora en términos de metáforas, siendo la mayoría conductistas-transmisivas para el rol del profesor y autorreferenciadas para el alumnado. Al comparar las metáforas, antes y después de las prácticas de enseñanza, se observa que la mayoría de los participantes no cambiaron sus metáforas ni sus modelos didácticos asociados, que ya estaban asentados antes del comienzo del Máster, y ni el Máster ni las prácticas de enseñanza han influido en ellos. En las emocionales el mayor porcentaje de las metáforas correspondió a la categoría cognitiva/constructivista para el rol del profesor y a la categoría autorreferenciada para el alumnado. La mayor parte de las emociones asociadas a las metáforas fueron sociales y positivas, tanto para el profesor como para el alumnado.

EL ROL DEL CAPITAL SOCIAL DEL EMPRENDEDOR EN LA EXPANSIÓN EXITOSA DE UNA START-UP. EL CASO DE HIPERTEXTO LTDA. - "LA LIBRERÍA DE LA U"

Directory of Open Access Journals (Sweden)

RUTH ESPERANZA ROMÁN CASTILLO

2009-01-01

Full Text Available En este artículo se pretende identificar el rol del capital social del emprend dor de la empresa Hipertexto Ltda., en el proceso de consolidación y posicionamiento de esta en el sector editorial. El método de caso es empleado para identificar un conjunto de variables potenciadoras del capital social del emprendedor, para luego proponer sus efectos sobre el desempeño empresarial. Como resultado final se formula un conjunto de proposiciones de investigación que pretenden contribuir a la comprensión del fenómeno de interés, y se propone un modelo de síntesis de la dinámica del intercambio producido entre el capital social analizado individual y organizacionalmente, mostrándose cómo dicha dinámica conduce al fortalecimiento del capital social organizacional como ventaja competitiva sostenible de la empresa.

Takagi-Taupin description of x-ray dynamical diffraction from diffractive optics with large numerical aperture

International Nuclear Information System (INIS)

Yan Hanfei; Maser, Joerg; Macrander, Albert; Shen Qun; Vogt, Stefan; Stephenson, G. Brian; Kang, Hyon Chol

2007-01-01

We present a formalism of x-ray dynamical diffraction from volume diffractive optics with large numerical aperture and high aspect ratio, in an analogy to the Takagi-Taupin equations [Acta Crystallogr. 15, 1311 (1962); Bull. Soc. Fr. Mineral. Crystallogr. 87, 469 (1964)] for strained single crystals. We derive a set of basic equations for dynamical diffraction from volume diffractive optics, which enable us to study the focusing property of these optics with various grating profiles. We study volume diffractive optics that satisfy the Bragg condition to various degrees, namely, flat, tilted, and wedged geometries, and derive the curved geometries required for ultimate focusing. We show that the curved geometries satisfy both the Bragg condition everywhere and phase requirement for point focusing and effectively focus hard x rays to a scale close to the wavelength. Our calculations were made for an x-ray wavelength of 0.064 nm (19.5 keV)

Groundwater flow simulations in support of the Local Scale Hydrogeological Description developed within the Laxemar Methodology Test Project

International Nuclear Information System (INIS)

Follin, Sven; Svensson, Urban

2002-05-01

The deduced Site Descriptive Model of the Laxemar area has been parameterised from a hydraulic point of view and subsequently put into practice in terms of a numerical flow model. The intention of the subproject has been to explore the adaptation of a numerical flow model to site-specific surface and borehole data, and to identify potential needs for development and improvement in the planned modelling methodology and tools. The experiences made during this process and the outcome of the simulations have been presented to the methodology test project group in course of the project. The discussion and conclusions made in this particular report concern two issues mainly, (i) the use of numerical simulations as a means of gaining creditability, e.g. discrimination between alternative geological models, and (ii) calibration and conditioning of probabilistic (Monte Carlo) realisations

Experimental and Numerical Modeling of Fluid Flow Processes in Continuous Casting: Results from the LIMMCAST-Project

Science.gov (United States)

Timmel, K.; Kratzsch, C.; Asad, A.; Schurmann, D.; Schwarze, R.; Eckert, S.

2017-07-01

The present paper reports about numerical simulations and model experiments concerned with the fluid flow in the continuous casting process of steel. This work was carried out in the LIMMCAST project in the framework of the Helmholtz alliance LIMTECH. A brief description of the LIMMCAST facilities used for the experimental modeling at HZDR is given here. Ultrasonic and inductive techniques and the X-ray radioscopy were employed for flow measurements or visualizations of two-phase flow regimes occurring in the submerged entry nozzle and the mold. Corresponding numerical simulations were performed at TUBAF taking into account the dimensions and properties of the model experiments. Numerical models were successfully validated using the experimental data base. The reasonable and in many cases excellent agreement of numerical with experimental data allows to extrapolate the models to real casting configurations. Exemplary results will be presented here showing the effect of electromagnetic brakes or electromagnetic stirrers on the flow in the mold or illustrating the properties of two-phase flows resulting from an Ar injection through the stopper rod.

Numerical simulation of heterogeneous phase transformations

International Nuclear Information System (INIS)

Combeau, H.; Lacaze, J.

1993-01-01

A numerical model is presented for the simulation of diffusion controlled phase transformations in multicomponent alloys. A closed system is considered, with simple geometric shape, either planar, cylindrical or spherical. The temperature inside this microscopic volume is homogeneous, but can vary according to any specified monoteneous law. Particular care has been given to the description of the solute profiles where the concentration gradients are the steepest, i.e. near the interface between the parent and the resultant phases. Solute redistribution at the interface is described by means of an original method which ensures that the overall solute balance is satisfied. A non linear system is obtained which includes the diffusion equations in both phases and the boundary conditions. The solution of this system makes use of a special algorithm which has been devised for a quick convergence. An example is presented which deals with microsegregation build-up during solidification of a multi-component nickel base alloy. (orig.)

Review of Project SAFE: Comments on biosphere conceptual model description and risk assessment methodology

Energy Technology Data Exchange (ETDEWEB)

Klos, Richard; Wilmot, Roger [Galson Sciences Ltd (United Kingdom)

2002-09-01

The Swedish Nuclear Fuel and Waste Management Company's (SKB's) most recent assessment of the safety of the Forsmark repository for low-level and intermediate-level waste (Project SAFE) is currently undergoing review by the Swedish regulators. As part of its review, the Swedish Radiation Protection Institute (SSI) identified that two components of SAFE require more detailed review: (i) the conceptual model description of the biosphere system, and (ii) SKB's risk assessment methodology. We have reviewed the biosphere system interaction matrix and how this has been used in the identification, justification and description of biosphere models for radiological assessment purposes. The risk assessment methodology has been reviewed considering in particular issues associated with scenario selection, assessment timescale, and the probability and risk associated with the well scenario. There is an extensive range of supporting information on which biosphere modelling in Project SAFE is based. However, the link between this material and the biosphere models themselves is not clearly set out. This leads to some contradictions and mis-matches between description and implementation. One example concerns the representation of the geosphere-biosphere interface. The supporting description of lakes indicates that interaction between groundwaters entering the biosphere through lake bed sediments could lead to accumulations of radionuclides in sediments. These sediments may become agricultural areas at some time in the future. In the numerical modelling of the biosphere carried out in Project SAFE, the direct accumulation of contaminants in bed sediments is not represented. Application of a more rigorous procedure to ensure numerical models are fit for purpose is recommended, paying more attention to issues associated with the geosphere-biosphere interface. A more structured approach to risk assessment would be beneficial, with a better explanation of the difference

Numerical simulation of mechatronic sensors and actuators finite elements for computational multiphysics

CERN Document Server

Kaltenbacher, Manfred

2015-01-01

Like the previous editions also the third edition of this book combines the detailed physical modeling of mechatronic systems and their precise numerical simulation using the Finite Element (FE) method. Thereby, the basic chapter concerning the Finite Element (FE) method is enhanced, provides now also a description of higher order finite elements (both for nodal and edge finite elements) and a detailed discussion of non-conforming mesh techniques. The author enhances and improves many discussions on principles and methods. In particular, more emphasis is put on the description of single fields by adding the flow field. Corresponding to these field, the book is augmented with the new chapter about coupled flow-structural mechanical systems. Thereby, the discussion of computational aeroacoustics is extended towards perturbation approaches, which allows a decomposition of flow and acoustic quantities within the flow region. Last but not least, applications are updated and restructured so that the book meets mode...

Low cycle fatigue numerical estimation of a high pressure turbine disc for the AL-31F jet engine

Directory of Open Access Journals (Sweden)

Spodniak Miroslav

2017-01-01

Full Text Available This article deals with the description of an approximate numerical estimation approach of a low cycle fatigue of a high pressure turbine disc for the AL-31F turbofan jet engine. The numerical estimation is based on the finite element method carried out in the SolidWorks software. The low cycle fatigue assessment of a high pressure turbine disc was carried out on the basis of dimensional, shape and material disc characteristics, which are available for the particular high pressure engine turbine. The method described here enables relatively fast setting of economically feasible low cycle fatigue of the assessed high pressure turbine disc using a commercially available software. The numerical estimation of accuracy of a low cycle fatigue depends on the accuracy of required input data for the particular investigated object.

A delta-rule model of numerical and non-numerical order processing.

Science.gov (United States)

Verguts, Tom; Van Opstal, Filip

2014-06-01

Numerical and non-numerical order processing share empirical characteristics (distance effect and semantic congruity), but there are also important differences (in size effect and end effect). At the same time, models and theories of numerical and non-numerical order processing developed largely separately. Currently, we combine insights from 2 earlier models to integrate them in a common framework. We argue that the same learning principle underlies numerical and non-numerical orders, but that environmental features determine the empirical differences. Implications for current theories on order processing are pointed out. PsycINFO Database Record (c) 2014 APA, all rights reserved.

Numerical simulation of porous burners and hole plate surface burners

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Nemoda Stevan

2004-01-01

Full Text Available In comparison to the free flame burners the porous medium burners, especially those with flame stabilization within the porous material, are characterized by a reduction of the combustion zone temperatures and high combustion efficiency, so that emissions of pollutants are minimized. In the paper the finite-volume numerical tool for calculations of the non-isothermal laminar steady-state flow, with chemical reactions in laminar gas flow as well as within porous media is presented. For the porous regions the momentum and energy equations have appropriate corrections. In the momentum equations for the porous region an additional pressure drop has to be considered, which depends on the properties of the porous medium. For the heat transfer within the porous matrix description a heterogeneous model is considered. It treats the solid and gas phase separately, but the phases are coupled via a convective heat exchange term. For the modeling of the reaction of the methane laminar combustion the chemical reaction scheme with 164 reactions and 20 chemical species was used. The proposed numerical tool is applied for the analyses of the combustion and heat transfer processes which take place in porous and surface burners. The numerical experiments are accomplished for different powers of the porous and surface burners, as well as for different heat conductivity character is tics of the porous regions.

Le rôle des syndicats québécois en matière d’accommodement des personnes handicapées The role of Québec unions with respect to the obligation to accommodate persons with disabilities El rol de los sindicatos quebequenses en materia de acomodamiento de las personas discapacitadas

Directory of Open Access Journals (Sweden)

Annick Desjardins

2010-02-01

Full Text Available L’obligation d’accommodement des salariés handicapés, à la faveur de développements jurisprudentiels importants, a pris une certaine ampleur au Québec, de sorte que le rôle de représentation des syndicats a évolué dans le cadre de ces changements. Le syndicat doit composer avec une modification de son rôle qui lui est imposée, qui lui donne des outils puissants pour revendiquer des mesures facilitant l’intégration et le maintien en emploi des salariés aux prises avec des limitations fonctionnelles, mais qui le place dans une situation de devoir arbitrer des intérêts divergents chez ses membres. Le présent texte expose le rôle des syndicats dans cette dynamique nouvelle en relations de travail, ainsi que les limites de l’action syndicale en matière d’accommodement des personnes handicapées.The obligation to accommodate workers with disabilities, due to significant developments in case law, has gained importance in Québec, such that the role of trade unions has evolved in the context of these changes. Unions are faced with a change in their role that is imposed, that provides them with powerful tools to demand measures to facilitate the integration and retention of employees with disabilities, but that also creates a situation where union representatives have to arbitrate conflicting interests among their members. This text explains the role of unions in this new dynamic in labour relations, and discusses the limitations in trade union action with respect to the duty to accommodate persons with disabilities.La obligación de acomodamiento de los asalariados discapacitados, tomó una cierta importancia en Quebec, gracias al gran desarrollo de la jurisprudencia. Así mismo, el rol de representación, que incumbe a los sindicatos, evolucionó en el contexto de estos cambios. El sindicato debe transigir con una modificación del rol que le es impuesto, lo que le provee de herramientas de gran alcance para revindicar

The streamline upwind Petrov-Galerkin stabilising method for the numerical solution of highly advective problems

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Carlos Humberto Galeano Urueña

2009-05-01

Full Text Available This article describes the streamline upwind Petrov-Galerkin (SUPG method as being a stabilisation technique for resolving the diffusion-advection-reaction equation by finite elements. The first part of this article has a short analysis of the importance of this type of differential equation in modelling physical phenomena in multiple fields. A one-dimensional description of the SUPG me- thod is then given to extend this basis to two and three dimensions. The outcome of a strongly advective and a high numerical complexity experiment is presented. The results show how the version of the implemented SUPG technique allowed stabilised approaches in space, even for high Peclet numbers. Additional graphs of the numerical experiments presented here can be downloaded from www.gnum.unal.edu.co.

Playing Linear Numerical Board Games Promotes Low-Income Children's Numerical Development

Science.gov (United States)

Siegler, Robert S.; Ramani, Geetha B.

2008-01-01

The numerical knowledge of children from low-income backgrounds trails behind that of peers from middle-income backgrounds even before the children enter school. This gap may reflect differing prior experience with informal numerical activities, such as numerical board games. Experiment 1 indicated that the numerical magnitude knowledge of…

Discrete variational derivative method a structure-preserving numerical method for partial differential equations

CERN Document Server

Furihata, Daisuke

2010-01-01

Nonlinear Partial Differential Equations (PDEs) have become increasingly important in the description of physical phenomena. Unlike Ordinary Differential Equations, PDEs can be used to effectively model multidimensional systems. The methods put forward in Discrete Variational Derivative Method concentrate on a new class of ""structure-preserving numerical equations"" which improves the qualitative behaviour of the PDE solutions and allows for stable computing. The authors have also taken care to present their methods in an accessible manner, which means that the book will be useful to engineer

Advanced numerical description of the behavior of 700 C steam power plant components

Energy Technology Data Exchange (ETDEWEB)

Maile, K. [Materialpruefungsanstalt, Univ. Stuttgart (Germany); Schmidt, K.; Roos, E.; Klenk, A.; Speicher, M.

2009-07-01

To make full use of the strength potential of new boiler materials like the new 9-11% Cr steels and nickel based alloys, taking into account their specific stress-strain relaxation behavior, new design methods are required in the design of today's power plants. Highly loaded components are approaching more and more the classical design limits with regard to critical wall thicknesses and the related tolerable thermal gradients, due to planed increases of steam parameters like steam pressure and steam temperature. ''Design by analysis'' can be realized by modern state of the art Numerical Finite Element (FE) simulation codes and in some cases by the use of user defined advanced inelastic material laws. These material laws have to be adjusted to specific material behavior of new boiler materials. To model the strain and stress situation in components under high temperature loading, a constitutive equation based on a Graham-Walles approach is used in this paper. Furthermore essential steps and recommendations to implement experimental data in the user defined subroutines and the subsequent integration of the subroutines in modern FE codes like ABAQUS trademark and ANSYS trademark are given. As an example, the results of FE simulations of components like hollow cylinders and waterwall like components made of Alloy 617 or 9-11% Cr steels are discussed and verified with experimental results. In a last step, the successful application of the developed creep equation will be demonstrated by calculating the creep strains and stress relaxation of a P92 steam header under constant loading. (orig.)

La corresponsabilidad educativa y social en el acoso e intimidación escolar. El rol del educador social

Directory of Open Access Journals (Sweden)

Carmen Carmen Orte Socias

2008-01-01

Full Text Available Este artículo se centra en los comportamientos que adopta el alumnado espectador de situaciones de bulling con sus iguales. La profundización en las causas de la escasa intervención de los espectadores en estas situaciones está siendo objeto de interés en la investigación. Se pretende formarlos para que adopten un rol más activo, implicándose en comportamientos prosociales de ayuda a sus compañeros víctimas de bulling. La corresponsabilidad como filosofía es una característica que debe tener la intervención. Forma parte de los planteamientos basados en la ayuda a los iguales, en los que el educador social puede tener un papel muy importante. ---------------------------------------------------------------------------- This paper contains a brief review of the theoretical reference models that explain the causes of bulling at school and specifically focuses on the behaviour of students looking on during these peer-bullying situations. Interest is growing in research into the causes of bystanders´ infrequent intervention in these situations. The goal is for students to be educated to take a more active role and get involved in pro-social behaviours to help schoolmates who are victims of bullying. These schoolmates who are victims of bullying. This research should be characterised by co-responsability as a philosophy, since it is an element of intervention approaches based on peer help, in which the social educator has an important role to play.

Fiches techniques Les triacylglycérols des huiles de graines de quatre Cucurbitacées tropicales des genres Lagenaria et Luffa

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Grondin Isabelle

2002-03-01

Full Text Available Les huiles de graines de quatre Cucurbitacées tropicales de l’île de la Réunion, provenant respectivement de deux variétés de l’espèce Lagenaria leucaritha (calebasses bouteille et la gale et de deux espèces du genre Luffa (pipangailles lisse et à côtes, ont été analysées aussi bien pour la fraction saponifiable que pour la fraction insaponifiable. L’étude de la fraction saponifiable a été consacrée, d’une part, à la détermination de la composition quantitative et qualitative en acides gras des différentes huiles dont les résultats ont fait l’objet d’une publication antérieure [1] et, d’autre part, à celle de leurs triacylglycérols. Une comparaison des compositions en acides gras des deux genres étudiés a permis de mettre en évidence les spécificités propres à chaque genre. Les genres Lagenaria et Luffa, présentant une composition en acides gras qualitativement similaire, contiennent ainsi les AG couramment rencontrés dans le règne végétal, à savoir les acides palmitique, stéarique, oléique et linoléique. Ce dernier est, par ailleurs, l’acide gras majoritaire avec des teneurs supérieures à 50%. La présence de cet acide gras essentiel confère ainsi à ces huiles de bonnes propriétés diététiques et nutritionnelles. Au sein du genre Lagenaria, les huiles des graines des variétés bouteille et la gale se caractérisent par leur teneur élevée en acide linoléique (71,5% pour la variété bouteille, et 81,5% pour la variété la gale. Les huiles de Lagenaria leucaritha sont du type palmitique-linoléique car ces deux acides gras représentent quantitativement plus de 85% des AG totaux. Contrairement à ces deux huiles, celles du genre Luffa se différencient, d’une part, par une teneur moindre en acide linoléique avec 55,3% pour l’espèce Luffa acutangula et 51,2% pour l’espèce Luffa cylindrica. D’autre part, elles sont du type palmitique-oléique-linoléique puisque ces trois

Numerical simulation of high-energy-electron gerated field in dielectrics of various geometries. Final report, June 1, 1979-May 15, 1980

International Nuclear Information System (INIS)

Yee, K.S.

1980-01-01

It has been observed that the exposure of dielectrics to electron beams can produce an electric field of sufficient magnitude to cause dielectric breakdown. The present investigations will be directed to calculate the electric field intensity in dielectrics under spherical and cylindrical geometries. In the spherical geometry the method of multiple images renders the full numerical calculation unnecessary, whereas in a finite length cylindrical geometry the full numerical calculation seems to be inevitable. A description and results of the spherical geometry are presented and a more detailed presentation of the finite cylinder geometry is given

Choosing a suitable sample size in descriptive sampling

International Nuclear Information System (INIS)

Lee, Yong Kyun; Choi, Dong Hoon; Cha, Kyung Joon

2010-01-01

Descriptive sampling (DS) is an alternative to crude Monte Carlo sampling (CMCS) in finding solutions to structural reliability problems. It is known to be an effective sampling method in approximating the distribution of a random variable because it uses the deterministic selection of sample values and their random permutation,. However, because this method is difficult to apply to complex simulations, the sample size is occasionally determined without thorough consideration. Input sample variability may cause the sample size to change between runs, leading to poor simulation results. This paper proposes a numerical method for choosing a suitable sample size for use in DS. Using this method, one can estimate a more accurate probability of failure in a reliability problem while running a minimal number of simulations. The method is then applied to several examples and compared with CMCS and conventional DS to validate its usefulness and efficiency

Inseguridad: en busca del rol de los medios de comunicación

Directory of Open Access Journals (Sweden)

Focás, Brenda

2013-01-01

Full Text Available [es] La llamada “sensación de inseguridad” se presenta con el declive del Estado de Bienestar, en un escenario de situaciones de desamparo, violencia civil, frágiles inserciones laborales, y falta de perspectivas de integración hacia el futuro. En este contexto, en Argentina, se duplicó el porcentaje de personas que teme ser víctima del delito, mientras que la tasa de criminalidad, luego de experimentar un aumento, se mantiene constante.Este artículo cuestiona el rol de los medios de comunicación en torno a la construcción de los discursos sobre la inseguridad y, para ello, se propone los siguientes objetivos. En primer lugar, analizar las operaciones mediáticas que marcaron fuertes cambios en la noticia policial: la cámara en el lugar del hecho, la actualización constante de la información por Internet, y la utilización de un estilo narrativo sensacionalista. En segundo lugar, indagar en la literatura sobre algunas líneas teóricas y/o autorales desde donde se pensó el proceso de recepción y circulación de la representación mediática del delito y, finalmente, reflexionar sobre el papel de los medios como responsables o posibilitadores de la inseguridad en un ethos epocal marcado por la indiferenciación cultural y la exclusión social. [en] The so-called ´feeling of insecurity´ comes about with the decline of the Welfare State, when the scene showed situations of neglect, civil violence, fragile job placement, and lack of integration prospects for the future. In Argentina, during the last years, the percentage of people who fear becoming a victim of crime doubled, while crime rates – after experiencing an increase - have leveled off. This article questions the role of the mass media in insecurity discourse construction, aiming at the following objectives. Firstly, to analyze the media operations which became a turning point in crime news: the camera on the action point, constant information update through the Internet

Description logics of context

CSIR Research Space (South Africa)

Klarman, S

2013-05-01

Full Text Available We introduce Description Logics of Context (DLCs) - an extension of Description Logics (DLs) for context-based reasoning. Our approach descends from J. McCarthy's tradition of treating contexts as formal objects over which one can quantify...

Numerical study of the Kadomtsev-Petviashvili equation and dispersive shock waves

Science.gov (United States)

Grava, T.; Klein, C.; Pitton, G.

2018-02-01

A detailed numerical study of the long time behaviour of dispersive shock waves in solutions to the Kadomtsev-Petviashvili (KP) I equation is presented. It is shown that modulated lump solutions emerge from the dispersive shock waves. For the description of dispersive shock waves, Whitham modulation equations for KP are obtained. It is shown that the modulation equations near the soliton line are hyperbolic for the KPII equation while they are elliptic for the KPI equation leading to a focusing effect and the formation of lumps. Such a behaviour is similar to the appearance of breathers for the focusing nonlinear Schrödinger equation in the semiclassical limit.

Water activities in Forsmark. Ecological field inventory and classification of biodiversity values and description of forest production land

International Nuclear Information System (INIS)

Hamren, Ulrika; Collinder, Per

2010-12-01

In 2009, the Swedish Nuclear Fuel and Waste Management Co (SKB) chose Forsmark in the Municipality of Oesthammar as site for the final repository for spent nuclear fuel. This report describes nature values and forestry areas in Forsmark, and provides part of the background material for description of consequences due to groundwater diversion during construction and operation of the repository. The report describes results of map studies and comprehensive field investigations, in terms of geographical delineations, descriptions of characteristics and classifications of nature values for groundwater dependent or groundwater favoured nature objects in Forsmark. The nature objects are located in an investigation area, which contains the area that according to numerical flow modelling could be affected by groundwater-table drawdown due to groundwater diversion

Discrimination of numerical proportions: A comparison of binomial and Gaussian models.

Science.gov (United States)

Raidvee, Aire; Lember, Jüri; Allik, Jüri

2017-01-01

Observers discriminated the numerical proportion of two sets of elements (N = 9, 13, 33, and 65) that differed either by color or orientation. According to the standard Thurstonian approach, the accuracy of proportion discrimination is determined by irreducible noise in the nervous system that stochastically transforms the number of presented visual elements onto a continuum of psychological states representing numerosity. As an alternative to this customary approach, we propose a Thurstonian-binomial model, which assumes discrete perceptual states, each of which is associated with a certain visual element. It is shown that the probability β with which each visual element can be noticed and registered by the perceptual system can explain data of numerical proportion discrimination at least as well as the continuous Thurstonian-Gaussian model, and better, if the greater parsimony of the Thurstonian-binomial model is taken into account using AIC model selection. We conclude that Gaussian and binomial models represent two different fundamental principles-internal noise vs. using only a fraction of available information-which are both plausible descriptions of visual perception.

Experimental And Numerical Investigation Of Aerothermal Characteristics Of The IXV Hypersonic Vehicle

Science.gov (United States)

Paris, S.; Charbonnier, D.; Tran, D.

2011-05-01

The main results of the aerothermodynamic hypersonic characterization of Intermediate eXperimental Vehicle (IXV), by means of both CFD simulations and wind tunnel measurements, have been reported and analyzed. In the framework of ESA FLPP Program, the VKI (Von Karman Institute) was in charge of an experimental test campaign for the consolidation of the aerothermal database in cold hypersonic regime. The tests campaign has been carried out at VKI Free Piston Longshot wind tunnel at mach 14. The numerical simulations have been performed for VKI wind tunnel conditions by CFSE with the in-house NSMB flow solver (Navier-Stokes Multi-Blocks 3D), the goal being to support the procedure of extrapolation-to-flight of the measurements and the general aerothermal characterization. Laminar, transitional and fully turbulent flows have been computed, with air considered as an ideal gas, for the wind tunnel tests numerical rebuilding. A detailed comparison of all measured and predicted hypersonic relevant phenomena and parameters (surface pressure and heat flux) is reported in the paper, together with a detailed description of configuration, freestream conditions, model attitude effects and flap deflection effect. The detailed analyze of the experimental and numerical data gives information on the nature of the flow on the body and on the flaps for the most critical configuration

The use of numerical technology for protection, control and automation - a concept description

International Nuclear Information System (INIS)

Gjerde, Oddbjoern; Langdal, Bjoern Inge; Kjoelle, Gerd H.; Aaboe, Yngve

2005-06-01

In the regulation of network companies of today there is a great focus on supplier reliability and the demands on the use of existing networks increase. Protection, control and automation (PCA) have a central role both with respect to supplier reliability and network utilization. The supplier reliability is also dependent on the installed equipment and the chosen conditions. This also applies to the use of the network that largely depend on the operational margins. This implies that the network company costs will depend on disruptions, maintenance and investments and would be influenced by the chosen protection, control and automation solutions. In the report the concept or the ideas for the use of information from numerical technology in connection with maintenance and handling of supply reliability are described. In operation the focus is on supply reliability and handling of operation disruptions through 1) prevention of faults and avoid disruptions and 2) reduce the consequences of operation disruptions. Examples show that costs in the central network could be reduced with about 60 %. In a selection of regional and distribution networks the costs could be reduced with about 70 %. The maintenance of the primary plant and the PCA equipment may be implemented based on systems and risk considerations. A consequence analysis with respect to economy, availability in the system, the system conditions, the equipment condition and consequences for customers is included. Examples show that the methodology is at best when applied to networks with little redundancy and that the method is applicable in new constructions or refinancing. It is then believed that the network (technical solutions) may be simplified and that necessary security may be obtained at risk based maintenance more than by a high degree of redundancy

Towards a Numerical Description of Volcano Aeroacoustic Source Processes using Lattice Boltzmann Strategies

Science.gov (United States)

Brogi, F.; Malaspinas, O.; Bonadonna, C.; Chopard, B.; Ripepe, M.

2015-12-01

Low frequency (data can be related to the exit velocity of the volcanic jet and to mass eruption rate, based on the geometric constrain of the vent and the mixture density. However, the application of the classical acoustic source models to volcanic explosive eruptions has shown to be challenging and a better knowledge of the link between the acoustic radiation and actual volcanic fluid dynamics processes is required. New insights into this subject could be given by the study of realistic aeroacoustic numerical simulations of a volcanic jet. Lattice Boltzmann strategies (LBS) provide the opportunity to develop an accurate, computationally fast, 3D physical model for a volcanic jet. In the field of aeroacoustic applications, dedicated LBS has been proven to have the low dissipative properties needed for capturing the weak acoustic pressure fluctuations. However, due to the big disparity in magnitude between the flow and the acoustic disturbances, even weak spurious noise sources in simulations can ruin the accuracy of the acoustic predictions. Reflected waves from artificial boundaries defined around the flow region can have significant influence on the flow field and overwhelm the acoustic field of interest. In addition, for highly multiscale turbulent flows, such as volcanic plumes, the number of grid points needed to represent the smallest scales might become intractable and the most complicated physics happen only in small portions of the computational domain. The implementation of the grid refinement, in our model allow us to insert local finer grids only where is actually needed and to increase the size of the computational domain for running more realistic simulations. 3D LBS model simulations for turbulent jet aeroacoustics have been accurately validated. Both mean flow and acoustic results are in good agreement with theory and experimental data available in the literature.

Seguridad ciudadana, movilización colectiva y percepción del delito : El rol de los medios de comunicación locales en la construcción de una marcha de silencio en una ciudad del interior de la provincia de Buenos Aires

OpenAIRE

Galar, Santiago

2009-01-01

El asesinato de un estudiante en la puerta de un baile universitario fue el punto de partida de una acción colectiva inédita ocurrida en la ciudad bonaerense de Azul, en mayo de 2007. En los seis días que separan el asesinato del joven del reclamo de justicia en su nombre los medios de comunicación locales cumplieron un rol determinante tanto en la construcción del caso como interviniendo en algunas redes de convocatoria tendidas por familiares y amigos. Los medios fueron fundamentales en la ...

Numerical analysis

CERN Document Server

Scott, L Ridgway

2011-01-01

Computational science is fundamentally changing how technological questions are addressed. The design of aircraft, automobiles, and even racing sailboats is now done by computational simulation. The mathematical foundation of this new approach is numerical analysis, which studies algorithms for computing expressions defined with real numbers. Emphasizing the theory behind the computation, this book provides a rigorous and self-contained introduction to numerical analysis and presents the advanced mathematics that underpin industrial software, including complete details that are missing from most textbooks. Using an inquiry-based learning approach, Numerical Analysis is written in a narrative style, provides historical background, and includes many of the proofs and technical details in exercises. Students will be able to go beyond an elementary understanding of numerical simulation and develop deep insights into the foundations of the subject. They will no longer have to accept the mathematical gaps that ex...

acme: The Amendable Coal-Fire Modeling Exercise. A C++ Class Library for the Numerical Simulation of Coal-Fires

Science.gov (United States)

Wuttke, Manfred W.

2017-04-01

At LIAG, we use numerical models to develop and enhance understanding of coupled transport processes and to predict the dynamics of the system under consideration. Topics include geothermal heat utilization, subrosion processes, and spontaneous underground coal fires. Although the details make it inconvenient if not impossible to apply a single code implementation to all systems, their investigations go along similar paths: They all depend on the solution of coupled transport equations. We thus saw a need for a modular code system with open access for the various communities to maximize the shared synergistic effects. To this purpose we develop the oops! ( open object-oriented parallel solutions) - toolkit, a C++ class library for the numerical solution of mathematical models of coupled thermal, hydraulic and chemical processes. This is used to develop problem-specific libraries like acme( amendable coal-fire modeling exercise), a class library for the numerical simulation of coal-fires and applications like kobra (Kohlebrand, german for coal-fire), a numerical simulation code for standard coal-fire models. Basic principle of the oops!-code system is the provision of data types for the description of space and time dependent data fields, description of terms of partial differential equations (pde), their discretisation and solving methods. Coupling of different processes, described by their particular pde is modeled by an automatic timescale-ordered operator-splitting technique. acme is a derived coal-fire specific application library, depending on oops!. If specific functionalities of general interest are implemented and have been tested they will be assimilated into the main oops!-library. Interfaces to external pre- and post-processing tools are easily implemented. Thus a construction kit which can be arbitrarily amended is formed. With the kobra-application constructed with acme we study the processes and propagation of shallow coal seam fires in particular in

Description of an identification method of thermocouple time constant based on application of recursive numerical filtering to temperature fluctuation

International Nuclear Information System (INIS)

Bernardin, B.; Le Guillou, G.; Parcy, JP.

1981-04-01

Usual spectral methods, based on temperature fluctuation analysis, aiming at thermocouple time constant identification are using an equipment too much sophisticated for on-line application. It is shown that numerical filtering is optimal for this application, the equipment is simpler than for spectral methods and less samples of signals are needed for the same accuracy. The method is described and a parametric study was performed using a temperature noise simulator [fr

New Trends in Model Coupling Theory, Numerics and Applications

International Nuclear Information System (INIS)

Coquel, F.; Godlewski, E.; Herard, J. M.; Segre, J.

2010-01-01

This special issue comprises selected papers from the workshop New Trends in Model Coupling, Theory, Numerics and Applications (NTMC'09) which took place in Paris, September 2 - 4, 2009. The research of optimal technological solutions in a large amount of industrial systems requires to perform numerical simulations of complex phenomena which are often characterized by the coupling of models related to various space and/or time scales. Thus, the so-called multi-scale modelling has been a thriving scientific activity which connects applied mathematics and other disciplines such as physics, chemistry, biology or even social sciences. To illustrate the variety of fields concerned by the natural occurrence of model coupling we may quote: meteorology where it is required to take into account several turbulence scales or the interaction between oceans and atmosphere, but also regional models in a global description, solid mechanics where a thorough understanding of complex phenomena such as propagation of cracks needs to couple various models from the atomistic level to the macroscopic level; plasma physics for fusion energy for instance where dense plasmas and collisionless plasma coexist; multiphase fluid dynamics when several types of flow corresponding to several types of models are present simultaneously in complex circuits; social behaviour analysis with interaction between individual actions and collective behaviour. (authors)

Numerical investigation of a Hall thruster plasma

International Nuclear Information System (INIS)

Roy, Subrata; Pandey, B.P.

2002-01-01

The dynamics of the Hall thruster is investigated numerically in the framework of a one-dimensional, multifluid macroscopic description of a partially ionized xenon plasma using finite element formulation. The model includes neutral dynamics, inelastic processes, and plasma-wall interaction. Owing to disparate temporal scales, ions and neutrals have been described by set of time-dependent equations, while electrons are considered in steady state. Based on the experimental observations, a third order polynomial in electron temperature is used to calculate ionization rate. The results show that in the acceleration channel the increase in the ion number density is related to the decrease in the neutral number density. The electron and ion velocity profiles are consistent with the imposed electric field. The electron temperature remains uniform for nearly two-thirds of the channel; then sharply increases to a peak before dropping slightly at the exit. This is consistent with the predicted electron gyration velocity distribution

EL ROL DE LA MORFOLOGÍA EN EL PROCESO DE APRENDIZAJE DE LA LECTURA EN ESPAÑOL

Directory of Open Access Journals (Sweden)

VIRGINIA JAICHENCO

2013-01-01

Full Text Available En lenguas con distintos sistemas ortográficos como el inglés, francés, finés e italiano se encontraron efectos de la presencia de morfemas en tareas que involucran el procesamiento de palabras escritas durante el desarrollo lector. Esta sensibilidad a la morfología se observa muy tempranamente en los lectores y también se ha descripto en niños con dificultades en la lectura. El objetivo del trabajo que se informa fue obtener evidencia acerca del rol de la morfología durante el proceso de aprendizaje de la lectura en español. Para ello se evaluaron tres grupos de niños de segundo a cuarto grado con tareas de decisión léxica y de lectura en voz alta, utilizando palabras y no palabras morfológicas, compuestas por dos morfemas en una combinación nueva y no palabras simples, sin componentes morfológicos. Los resultados mostraron, por un lado, un efecto de frecuencia para el procesamiento de palabras en ambas pruebas y, por otro, un efecto de interferencia de los morfemas en la tarea de decisión léxica y de facilitación en la lectura en voz alta para las no palabras compuestas por morfemas. Estos efectos se interpretan como el resultado del desarrollo temprano de un léxico ortográfico que incluye morfemas como unidades de representación utilizadas por los lectores iniciales para el reconocimiento y la lectura de estímulos nuevos. Esto se produce en detrimento de los procesos sublexicales que usualmente se utilizan para procesar estos estímulos nuevos y que son más lentos y laboriosos puesto que procesan unidades menores que el morfema o la palabra completa.

Physics 3204. Course Description.

Science.gov (United States)

Newfoundland and Labrador Dept. of Education.

A description of the physics 3204 course in Newfoundland and Labrador is provided. The description includes: (1) statement of purpose, including general objectives of science education; (2) a list of six course objectives; (3) course content for units on sound, light, optical instruments, electrostatics, current electricity, Michael Faraday and…

Numerical solution of large nonlinear boundary value problems by quadratic minimization techniques

International Nuclear Information System (INIS)

Glowinski, R.; Le Tallec, P.

1984-01-01

The objective of this paper is to describe the numerical treatment of large highly nonlinear two or three dimensional boundary value problems by quadratic minimization techniques. In all the different situations where these techniques were applied, the methodology remains the same and is organized as follows: 1) derive a variational formulation of the original boundary value problem, and approximate it by Galerkin methods; 2) transform this variational formulation into a quadratic minimization problem (least squares methods) or into a sequence of quadratic minimization problems (augmented lagrangian decomposition); 3) solve each quadratic minimization problem by a conjugate gradient method with preconditioning, the preconditioning matrix being sparse, positive definite, and fixed once for all in the iterative process. This paper will illustrate the methodology above on two different examples: the description of least squares solution methods and their application to the solution of the unsteady Navier-Stokes equations for incompressible viscous fluids; the description of augmented lagrangian decomposition techniques and their application to the solution of equilibrium problems in finite elasticity

Numerical modelling of surface hydrology and near-surface hydrogeology at Forsmark. Site descriptive modelling SDM. Site Forsmark

Energy Technology Data Exchange (ETDEWEB)

Bosson, Emma (Swedish Nuclear Fuel and Waste Management Co., Stockholm (Sweden)); Gustafsson, Lars-Goeran; Sassner, Mona (DHI Sverige AB, Stockholm (Sweden))

2008-09-15

SKB is currently performing site investigations at two potential sites for a final repository for spent nuclear fuel. This report presents results of water flow and solute transport modelling of the Forsmark site. The modelling reported in this document focused on the near-surface groundwater, i.e. groundwater in Quaternary deposits and shallow rock, and surface water systems, and was performed using the MIKE SHE tool. The most recent site data used in the modelling were delivered in the Forsmark 2.3 dataset, which had its 'data freeze' on March 31, 2007. The present modelling is performed in support of the final version of the Forsmark site description that is produced during the site investigation phase. In this work, the hydrological modelling system MIKE SHE has been used to describe near-surface groundwater flow and the contact between groundwater and surface water at the Forsmark site. The surface water system at Forsmark is described with the one-dimensional 'channel flow' modelling tool MIKE 11, which is fully and dynamically integrated with MIKE SHE. The MIKE SHE model was updated with data from the F2.3 data freeze. The main updates concerned the geological description of the saturated zone and the time series data on water levels and surface water discharges. The time series data used as input data and for calibration and validation was extended until the Forsmark 2.3 data freeze (March 31, 2007). The present work can be subdivided into the following four parts: 1. Update of the numerical flow model. 2. Sensitivity analysis and calibration of the model parameters. 3. Validation of the calibrated model, followed by evaluation and identification of discrepancies between measurements and model results. 4. Additional sensitivity analysis and calibration in order to resolve the problems identified in point three above. The main actions taken during the calibration can be summarised as follows: 1. The potential evapotranspiration was

A numerical study of adaptive space and time discretisations for Gross–Pitaevskii equations

Science.gov (United States)

Thalhammer, Mechthild; Abhau, Jochen

2012-01-01

As a basic principle, benefits of adaptive discretisations are an improved balance between required accuracy and efficiency as well as an enhancement of the reliability of numerical computations. In this work, the capacity of locally adaptive space and time discretisations for the numerical solution of low-dimensional nonlinear Schrödinger equations is investigated. The considered model equation is related to the time-dependent Gross–Pitaevskii equation arising in the description of Bose–Einstein condensates in dilute gases. The performance of the Fourier-pseudo spectral method constrained to uniform meshes versus the locally adaptive finite element method and of higher-order exponential operator splitting methods with variable time stepsizes is studied. Numerical experiments confirm that a local time stepsize control based on a posteriori local error estimators or embedded splitting pairs, respectively, is effective in different situations with an enhancement either in efficiency or reliability. As expected, adaptive time-splitting schemes combined with fast Fourier transform techniques are favourable regarding accuracy and efficiency when applied to Gross–Pitaevskii equations with a defocusing nonlinearity and a mildly varying regular solution. However, the numerical solution of nonlinear Schrödinger equations in the semi-classical regime becomes a demanding task. Due to the highly oscillatory and nonlinear nature of the problem, the spatial mesh size and the time increments need to be of the size of the decisive parameter 0Fourier pseudo-spectral and the finite element method. Nevertheless, for smaller parameter values locally adaptive time discretisations facilitate to determine the time stepsizes sufficiently small in order that the numerical approximation captures correctly the behaviour of the analytical solution. Further illustrations for Gross–Pitaevskii equations with a focusing nonlinearity or a sharp Gaussian as initial condition, respectively

Eutanasia, estado constitucional y democracia: la validez de los argumentos religiosos en las decisiones de la Corte Constitucional Colombiana a la luz de la propuesta de Habermas sobre el rol de la religión en la esfera pública

OpenAIRE

Aguirre Román, Javier; Universidad Industrial de Santander, Bucaramanga; Silva Rojas, Alonso; Universidad Industrial de Santander, Bucaramanga; Pabón Mantilla, Ana Patricia; Universidad Autónoma de Bucaramanga

2015-01-01

El producto de investigación que se presenta gira alrededor de la pregunta por la postura de la Corte Constitucional de Colombia en relación con los argumentos religiosos a la hora de fundamentar y expresar sus decisiones en algunos casos controvertidos. Para analizar dicho problema se ha propuesto abordar una interpretación sistemática y crítica de un aspecto concreto de la filosofía de JürgenHabermas, a saber, su propuesta acerca del rol de la religión en la esfera pública. La reflexión con...

Eutanasia, estado constitucional y democracia: la validez de los argumentos religiosos en las decisiones de la Corte Constitucional colombiana a la luz de la propuesta de Habermas sobre el rol de la religión en la esfera pública

OpenAIRE

Aguirre Román, Javier; Silva Rojas, Alonso; Pabón Mantilla, Ana Patricia

2015-01-01

El producto de investigación que se presenta gira alrededor de la pregunta por la postura de la Corte Constitucional de Colombia en relación con los argumentos religiosos a la hora de fundamentar y expresar sus decisiones en algunos casos controvertidos. Para analizar dicho problema se ha propuesto abordar una interpretación sistemática y crítica de un aspecto concreto de la filosofía de Jürgen Habermas, a saber, su propuesta acerca del rol de la religión en la esfera pública. La reflexión co...

Rigorous numerical modeling of scattering-type scanning near-field optical microscopy and spectroscopy

Science.gov (United States)

Chen, Xinzhong; Lo, Chiu Fan Bowen; Zheng, William; Hu, Hai; Dai, Qing; Liu, Mengkun

2017-11-01

Over the last decade, scattering-type scanning near-field optical microscopy and spectroscopy have been widely used in nano-photonics and material research due to their fine spatial resolution and broad spectral range. A number of simplified analytical models have been proposed to quantitatively understand the tip-scattered near-field signal. However, a rigorous interpretation of the experimental results is still lacking at this stage. Numerical modelings, on the other hand, are mostly done by simulating the local electric field slightly above the sample surface, which only qualitatively represents the near-field signal rendered by the tip-sample interaction. In this work, we performed a more comprehensive numerical simulation which is based on realistic experimental parameters and signal extraction procedures. By directly comparing to the experiments as well as other simulation efforts, our methods offer a more accurate quantitative description of the near-field signal, paving the way for future studies of complex systems at the nanoscale.

Resolving the biophysics of axon transmembrane polarization in a single closed-form description

Energy Technology Data Exchange (ETDEWEB)

Melendy, Robert F., E-mail: rfmelendy@liberty.edu [School of Engineering and Computational Sciences, Liberty University, Lynchburg, Virginia 24515 (United States)

2015-12-28

When a depolarizing event occurs across a cell membrane there is a remarkable change in its electrical properties. A complete depolarization event produces a considerably rapid increase in voltage that propagates longitudinally along the axon and is accompanied by changes in axial conductance. A dynamically changing magnetic field is associated with the passage of the action potential down the axon. Over 75 years of research has gone into the quantification of this phenomenon. To date, no unified model exist that resolves transmembrane polarization in a closed-form description. Here, a simple but formative description of propagated signaling phenomena in the membrane of an axon is presented in closed-form. The focus is on using both biophysics and mathematical methods for elucidating the fundamental mechanisms governing transmembrane polarization. The results presented demonstrate how to resolve electromagnetic and thermodynamic factors that govern transmembrane potential. Computational results are supported by well-established quantitative descriptions of propagated signaling phenomena in the membrane of an axon. The findings demonstrate how intracellular conductance, the thermodynamics of magnetization, and current modulation function together in generating an action potential in a unified closed-form description. The work presented in this paper provides compelling evidence that three basic factors contribute to the propagated signaling in the membrane of an axon. It is anticipated this work will compel those in biophysics, physical biology, and in the computational neurosciences to probe deeper into the classical and quantum features of membrane magnetization and signaling. It is hoped that subsequent investigations of this sort will be advanced by the computational features of this model without having to resort to numerical methods of analysis.

The role of Energy Service Companies (ESCOs) in the realization of heat pump systems in building projects. Conclusions of marketing research; De rol van ESCO's bij het realiseren van warmtepompsystemen in woningbouwprojecten. Conclusies uit een marktverkenning

Energy Technology Data Exchange (ETDEWEB)

Koster, S.J. [Q en P, Renkum (Netherlands); Bekkema, H.; Kleefkens, O.; Bosselaar, L. [AgentschapNL, Utrecht (Netherlands)

2011-03-15

ESCO is the abbreviation of Energy Service Companies. What role do ESCOs play? What does the business model look like? Which technical solutions are available? What does the organizational model look like? What is the optimal approach? In view of the market developments, NLAgency requested an overview of the current state of affairs in the Netherlands. [Dutch] ESCO staat voor 'Energy Service Company' oftewel energiedienstenleverancier. Welke rol heeft een ESCO? Hoe ziet het businessmodel eruit? Welke technische oplossingen zijn er? Hoe ziet het organisatiemodel eruit? Wat is de optimale aanpak? Omdat de markt volop in ontwikkeling heeft AgentschapNL laten uitzoeken wat de stand van zaken in Nederland is.

Numerical Development

Science.gov (United States)

Siegler, Robert S.; Braithwaite, David W.

2016-01-01

In this review, we attempt to integrate two crucial aspects of numerical development: learning the magnitudes of individual numbers and learning arithmetic. Numerical magnitude development involves gaining increasingly precise knowledge of increasing ranges and types of numbers: from non-symbolic to small symbolic numbers, from smaller to larger…

A detailed survey of numerical methods for unconstrained minimization. Pt. 1

International Nuclear Information System (INIS)

Mika, K.; Chaves, T.

1980-01-01

A detailed description of numerical methods for unconstrained minimization is presented. This first part surveys in particular conjugate direction and gradient methods, whereas variable metric methods will be the subject of the second part. Among the results of special interest we quote the following. The conjugate direction methods of Powell, Zangwill and Sutti can be best interpreted if the Smith approach is adopted. The conditions for quadratic termination of Powell's first procedure are analyzed. Numerical results based on nonlinear least squares problems are presented for the following conjugate direction codes: VA04AD from Harwell Subroutine Library and ZXPOW from IMSL, both implementations of Powell's second procedure, DFMND from IBM-SILMATH (Zangwill's method) and Brent's algorithm PRAXIS. VA04AD turns out to be superior in all cases, PRAXIS improves for high-dimensional problems. All codes clearly exhibit superlinear convergence. Akaike's result for the method of steepest descent is derived directly from a set of nonlinear recurrence relations. Numerical results obtained with the highly ill conditioned Hilbert function confirm the theoretical predictions. Several properties of the conjugate gradient method are presented and a new derivation of the equivalence of steepest descent partan and the CG method is given. A comparison of numerical results from the CG codes VA08AD (Fletcher-Reeves), DFMCG (the SSP version of the Fletcher-Reevens algorithm) and VA14AD (Powell's implementation of the Polak-Ribiere formula) reveals that VA14AD is clearly superior in all cases, but that the convergence rate of these codes is only weakly superlinear such that high accuracy solutions require extremely large numbers of function calls. (orig.)

Numerical Optimization in Microfluidics

DEFF Research Database (Denmark)

Jensen, Kristian Ejlebjærg

2017-01-01

Numerical modelling can illuminate the working mechanism and limitations of microfluidic devices. Such insights are useful in their own right, but one can take advantage of numerical modelling in a systematic way using numerical optimization. In this chapter we will discuss when and how numerical...... optimization is best used....

Abortion and women's roles in society: opinions from Tlaxcala, Mexico El aborto y el rol de las mujeres en la sociedad: resultados de una encuesta de opinión en Tlaxcala, México

Directory of Open Access Journals (Sweden)

Tia M Palermo

2010-02-01

Full Text Available OBJECTIVE: We aim to assess the opinions of Mexicans in the state of Tlaxcala on abortion and other topics concerning women's reproductive health and status in society. MATERIAL AND METHODS: We summarize opinions on abortion and women's roles in society and perform logit regressions to assess characteristics correlated with support for abortion rights. RESULTS: A majority of respondents were against a woman's right to abortion when asked generally, but when asked about specific circumstances, a majority supported the right to abortion in five of the nine hypothetical circumstances proposed. In multivariate analysis, age, education, religion, religious service attendance, and views regarding women's roles in society had significant effects on support for the right to abortion. CONCLUSIONS: Our results demonstrate that residents of Tlaxcala view abortion as a personal decision and support a woman's right to abortion in more circumstances than currently allowed under state law.OBJETIVO: Describir opiniones sobre salud sexual y reproductiva, aborto y rol social de las mujeres entre un grupo de residentes de Tlaxcala, México. MATERIAL Y MÉTODOS: El análisis de regresión logística analizó características asociadas con una postura de apoyo al derecho al aborto. RESULTADOS: La mayoría no favoreció el derecho de las mujeres a interrumpir un embarazo cuando se preguntó de manera general. Al momento de circunscribirlo a circunstancias específicas, la mayoría estuvo a favor en cinco de las nueve de situaciones hipotéticas planteadas. En análisis multivariado, edad, escolaridad, religión, asistencia a servicios religiosos y opiniones sobre el rol social femenino fueron variables significativas del apoyo que se brinda a una mujer para ejercer su derecho a interrumpir un embarazo. CONCLUSIONES: Los residentes de Tlaxcala perciben el tema del aborto como una decisión personal y apoyan el derecho de una mujer a interrumpirlo especialmente bajo

Hindi Numerals.

Science.gov (United States)

Bright, William

In most languages encountered by linguists, the numerals, considered as a paradigmatic set, constitute a morpho-syntactic problem of only moderate complexity. The Indo-Aryan language family of North India, however, presents a curious contrast. The relatively regular numeral system of Sanskrit, as it has developed historically into the modern…

An analytical description of the low temperature behaviour of a weakly interacting Bose gas

International Nuclear Information System (INIS)

Su Guozhen; Chen Lixuan; Chen Jincan

2004-01-01

An analytical description of the low temperature behaviour of a trapped interacting Bose gas is presented by using a simple approach that is based on the principle of the constancy of chemical potentials in equilibrium and the local-density approximation. Several thermodynamic quantities, which include the ground-state fraction, chemical potential, total energy, entropy and heat capacity, are derived analytically. It is shown that the results obtained here are in excellent agreement with the experimental data and the theoretical predictions based on the numerical calculation. Meanwhile, by selecting a suitable variable, the divergent problem existing in some papers is solved

Methods of numerical relativity

International Nuclear Information System (INIS)

Piran, T.

1983-01-01

Numerical Relativity is an alternative to analytical methods for obtaining solutions for Einstein equations. Numerical methods are particularly useful for studying generation of gravitational radiation by potential strong sources. The author reviews the analytical background, the numerical analysis aspects and techniques and some of the difficulties involved in numerical relativity. (Auth.)

Generalizing: The descriptive struggle

Directory of Open Access Journals (Sweden)

Barney G. Glaser, Ph.D.; Hon Ph.D.

2006-11-01

Full Text Available The literature is not kind to the use of descriptive generalizations. Authors struggle and struggle to find and rationalize a way to use them and then fail in spite of trying a myriad of work-arounds. And then we have Lincoln and Guba’s famous statement: “The only generalization is: there is no generalization” in referring to qualitative research. (op cit, p. 110 They are referring to routine QDA yielding extensive descriptions, but which tacitly include conceptual generalizations without any real thought of knowledge about them. In this chapter I wish to explore this struggle for the purpose of explaining that the various contra arguments to using descriptive generalizations DO NOT apply to the ease of using conceptual generalizations yielded in SGT and especially FGT. I will not argue for the use of descriptive generalization. I agree with Lincoln and Guba with respect to QDA, “the only generalization is: there is no generalization.” It is up to the QDA methodologists, of whom there are many; to continue the struggle and I wish them well.

Numerical study of shear thickening fluid with discrete particles embedded in a base fluid

Directory of Open Access Journals (Sweden)

W Zhu

2016-09-01

Full Text Available The Shear Thickening Fluid (STF is a dilatant material, which displays non-Newtonian characteristics in its unique ability to transit from a low viscosity fluid to a high viscosity fluid. The research performed investigates the STF behavior by modeling and simulation of the interaction between the base flow and embedded rigid particles when subjected to shear stress. The model considered the Lagrangian description of the rigid particles and the Eulerian description of fluid flow. The numerical analysis investigated key parameters such as applied flow acceleration, particle distribution and arrangement, volume concentration of particles, particle size, shape and their behavior in a Newtonian and non-Newtonian fluid base. The fluid-particle interaction model showed that the arrangement, size, shape and volume concentration of the particles had a significant effect on the behavior of the STF. Although non-conclusive, the addition of particles in non-Newtonian fluids showed a promising trend of improved shear thickening effects at high shear strain rates.

Wood cross-arms coated with polyurethane resin - tests and numerical simulations

Directory of Open Access Journals (Sweden)

Ruy Alberto Correa Altafim

2006-03-01

Full Text Available Brazil's electric power utilities have commonly employed native timbers as the main material for manufacturing cross-arms for distribution lines. However, the increasingly high costs of these timbers and Brazil's new environmental laws have contributed to change this situation, spurring research on new materials for application in transmission and distribution systems. This paper discusses two reforested wood species, Pinus elliottii and Eucalyptus citriodora, coated with castor oil-based polyurethane resins, as an alternative material for distribution line cross-arms, from the standpoint of their mechanical and electrical properties and their low cost. Numerical simulations and a complete description of the entire coating process are also part of this work.

Numerical description of cavitation on axisymmetric bodies

Energy Technology Data Exchange (ETDEWEB)

Hickox, C.E.; Hailey, C.E.; Wolfe, W.P.; Watts, H.A.; Gross, R.J.; Ingber, M.S.

1988-01-01

This paper reports on ongoing studies which are directed toward the development of predictive techniques for the modeling of steady cavitation on axisymmetric bodies. The primary goal of the modeling effort is the prediction of cavity shape and pressure distribution from which forces and moments can be calculated. Here we present an overview of the modeling techniques developed and compare predictions with experimental data obtained from water tunnel tests for both limited and supercavitation. 14 refs., 4 figs.

Simpevarp - site descriptive model version 0

Energy Technology Data Exchange (ETDEWEB)

NONE

2002-11-01

During 2002, SKB is starting detailed investigations at two potential sites for a deep repository in the Precambrian rocks of the Fennoscandian Shield. The present report concerns one of those sites, Simpevarp, which lies in the municipality of Oskarshamn, on the southeast coast of Sweden, about 250 kilometres south of Stockholm. The site description will have two main components: a written synthesis of the site, summarising the current state of knowledge, as documented in the databases containing the primary data from the site investigations, and one or several site descriptive models, in which the collected information is interpreted and presented in a form which can be used in numerical models for rock engineering, environmental impact and long-term safety assessments. SKB maintains two main databases at the present time, a site characterisation database called SICADA and a geographic information system called SKB GIS. The site descriptive model will be developed and presented with the aid of the SKB GIS capabilities, and with SKBs Rock Visualisation System (RVS), which is also linked to SICADA. The version 0 model forms an important framework for subsequent model versions, which are developed successively, as new information from the site investigations becomes available. Version 0 is developed out of the information available at the start of the site investigation. In the case of Simpevarp, this is essentially the information which was compiled for the Oskarshamn feasibility study, which led to the choice of that area as a favourable object for further study, together with information collected since its completion. This information, with the exception of the extensive data base from the nearby Aespoe Hard Rock Laboratory, is mainly 2D in nature (surface data), and is general and regional, rather than site-specific, in content. Against this background, the present report consists of the following components: an overview of the present content of the databases

Forsmark - site descriptive model version 0

Energy Technology Data Exchange (ETDEWEB)

NONE

2002-10-01

During 2002, the Swedish Nuclear Fuel and Waste Management Company (SKB) is starting investigations at two potential sites for a deep repository in the Precambrian basement of the Fennoscandian Shield. The present report concerns one of those sites, Forsmark, which lies in the municipality of Oesthammar, on the east coast of Sweden, about 150 kilometres north of Stockholm. The site description should present all collected data and interpreted parameters of importance for the overall scientific understanding of the site, for the technical design and environmental impact assessment of the deep repository, and for the assessment of long-term safety. The site description will have two main components: a written synthesis of the site, summarising the current state of knowledge, as documented in the databases containing the primary data from the site investigations, and one or several site descriptive models, in which the collected information is interpreted and presented in a form which can be used in numerical models for rock engineering, environmental impact and long-term safety assessments. The site descriptive models are devised and stepwise updated as the site investigations proceed. The point of departure for this process is the regional site descriptive model, version 0, which is the subject of the present report. Version 0 is developed out of the information available at the start of the site investigation. This information, with the exception of data from tunnels and drill holes at the sites of the Forsmark nuclear reactors and the underground low-middle active radioactive waste storage facility, SFR, is mainly 2D in nature (surface data), and is general and regional, rather than site-specific, in content. For this reason, the Forsmark site descriptive model, version 0, as detailed in the present report, has been developed at a regional scale. It covers a rectangular area, 15 km in a southwest-northeast and 11 km in a northwest-southeast direction, around the

A numerical study of adaptive space and time discretisations for Gross-Pitaevskii equations.

Science.gov (United States)

Thalhammer, Mechthild; Abhau, Jochen

2012-08-15

As a basic principle, benefits of adaptive discretisations are an improved balance between required accuracy and efficiency as well as an enhancement of the reliability of numerical computations. In this work, the capacity of locally adaptive space and time discretisations for the numerical solution of low-dimensional nonlinear Schrödinger equations is investigated. The considered model equation is related to the time-dependent Gross-Pitaevskii equation arising in the description of Bose-Einstein condensates in dilute gases. The performance of the Fourier-pseudo spectral method constrained to uniform meshes versus the locally adaptive finite element method and of higher-order exponential operator splitting methods with variable time stepsizes is studied. Numerical experiments confirm that a local time stepsize control based on a posteriori local error estimators or embedded splitting pairs, respectively, is effective in different situations with an enhancement either in efficiency or reliability. As expected, adaptive time-splitting schemes combined with fast Fourier transform techniques are favourable regarding accuracy and efficiency when applied to Gross-Pitaevskii equations with a defocusing nonlinearity and a mildly varying regular solution. However, the numerical solution of nonlinear Schrödinger equations in the semi-classical regime becomes a demanding task. Due to the highly oscillatory and nonlinear nature of the problem, the spatial mesh size and the time increments need to be of the size of the decisive parameter [Formula: see text], especially when it is desired to capture correctly the quantitative behaviour of the wave function itself. The required high resolution in space constricts the feasibility of numerical computations for both, the Fourier pseudo-spectral and the finite element method. Nevertheless, for smaller parameter values locally adaptive time discretisations facilitate to determine the time stepsizes sufficiently small in order that

Dinamika Kelompok Penerima CSR PLN Tarahan Lampung Selatan

OpenAIRE

Kusnani, Dedeh Kurniasih; Muljono, Pudji; Saleh, Amiruddin

2015-01-01

The study aims to: (1) analyze the level of group dynamics; (2) analyze relation between internal and external characteristics of members and group dynamics. The research uses survey method and was conducted in South Lampung. Numbers of samples are 50 respondents. Descriptive and correlational analysis was used to explain this research. The results of the research show that: (1) the level of group dynamics was low because the group goals are not specific, the structure is not clear, group rol...

Aspectos celulares y moleculares de la nefropatía diabética, rol del VEGF-A

Directory of Open Access Journals (Sweden)

Katherine Carranza

2015-03-01

Full Text Available La prevalencia de diabetes mellitus aumentó en el último siglo y se estima que el 45% de los pacientes, no estarían diagnosticados. En Sudamérica la prevalencia de diabetes y de enfermedad renal crónica (ERC incrementó, existiendo gran disparidad entre los países respecto al acceso a diálisis. En Ecuador es una de las principales causas de mortalidad, principalmente en las provincias ubicadas en la costa del océano Pacífico. La mayor causa aislada de ingreso a diálisis es la nefropatía diabética (ND. Aun utilizando las mejores opciones terapéuticas para la ND, el riesgo residual de proteinuria y de ERC terminal permanece elevado. En esta revisión describimos la importancia del problema en el mundo y en nuestra región. Analizamos estudios moleculares y celulares relevantes que indican la crucial importancia de eventos glomerulares en el desarrollo y en la evolución de la ND y en la insulinorresistencia. Incluimos conceptos anatómicos, fisiopatológicos y clínicos básicos, desarrollando especial énfasis en el rol de factores angiogénicos como el factor de crecimiento vascular endotelial (VEGF-A y su relación con el receptor de insulina, la sintasa endotelial de óxido nítrico-óxido nítrico (eNOS y las angiopoietinas. En el transcurso del texto proponemos diversas vías, que a nuestro entender tienen potencial terapéutico. Profundizar en el estudio del VEGF-A y las angiopoietinas, el estado de VEGF resistencia glomerular, la relación del receptor 2 de VEGF/ nefrina, VEGF/receptores de insulina/nefrina, la relación VEGF/eNOS-ON a nivel glomerular podría aportar soluciones al acuciante problema de la ND en el mundo y generar nuevas alternativas de tratamiento.

Numerieke berekeningen aan een luchtstroming in een spleetblazer, uit het oogpunt van trekkrachtgeneratie in een nonwoven-produktieproces [Numerical computation of flow phenomena in a transport jet for the tractive power generation in a nonwoven producti

NARCIS (Netherlands)

D. Lanser (Debby)

1997-01-01

textabstractAkzo Nobel is een belangrijke producent van zgn. nonwovens of spinvliezen. Een essentiële rol in een nieuw nonwovenproduktieproces wordt gespeeld door de spleetblazer. Om de filamenten, de dunne draadjes waaruit het nonwoven is opgebouwd, te verstrekken en te transporteren, wordt in de

RECHERCHES Distribution anormale des apolipoprotéines CIII et diminution de la capacité d’efflux de cholestérol du plasma de sujets normolipidémiques présentant une maladie coronarienne précoce

Directory of Open Access Journals (Sweden)

Delplanque Bernadette

2002-07-01

�tait significativement plus élevées chez les coronariens que chez les contrôles et l’amplitude de la réponse postprandiale exprimée par une mesure d’aire sous la courbe, ainsi que la durée de la réponse, étaient de 30% plus importantes chez les coronariens (p < 0,002 et p < 0,05 respectivement. Les bilans lipidique et apoprotéique à jeun étaient normaux et les concentrations de cholestérol, LDL-C, HDL-C, TG, Apo AI, B, CII, CIII et E ne différaient pas entre les groupes. La répartition des apoCII et apoE entre les HDL et les lipoprotéines riches en triglycérides (TGRL ne montrait pas de différence significative. En revanche l’analyse des apoCIII montrait une anomalie de distribution : il apparaissait deux fois plus d’apoCIII sur les lipoprotéines riches en TG (TGRL-CIII, p < 0,001 entraînant une différence très significative du CIII-Ratio (TGRL-CIII/HDL-CIII, p < 0,0001. De plus, l’amplitude de la réponse postprandiale exprimée par une mesure d’incrément d’aire sous la courbe était très fortement et positivement corrélée aux valeurs de TGRL-CIII à jeun et au CIII-Ratio (p < 0,001. Ces premiers résultats obtenus chez des sujets coronariens ne présentant aucun facteur de risque connu et strictement normolipidémiques à jeun, nous avaient permis de conclure que la valeur de ces apoCIII liées aux particules riches en TG (TGRL-CIII ainsi que l’établissement du CIII-Ratio représentaient le marqueur à jeun d’une anomalie postprandiale chez les coronariens normolipidémiques. D’autre part, les valeurs de TGRL-CIII ou le CIII-Ratio, s’ils représentent un marqueur de l’anomalie postprandiale, peuvent également représenter un nouveau facteur de risque de la maladie coronarienne puisque c’était la seule différence que nous ayons pu trouver entre nos groupes contrôle et coronarien. Les apoCIII, de par leur implication dans le métabolisme des triglycérides, représentent donc le facteur de l’anomalie liée moléculairement et m

Forsmark - site descriptive model version 0

International Nuclear Information System (INIS)

2002-10-01

During 2002, the Swedish Nuclear Fuel and Waste Management Company (SKB) is starting investigations at two potential sites for a deep repository in the Precambrian basement of the Fennoscandian Shield. The present report concerns one of those sites, Forsmark, which lies in the municipality of Oesthammar, on the east coast of Sweden, about 150 kilometres north of Stockholm. The site description should present all collected data and interpreted parameters of importance for the overall scientific understanding of the site, for the technical design and environmental impact assessment of the deep repository, and for the assessment of long-term safety. The site description will have two main components: a written synthesis of the site, summarising the current state of knowledge, as documented in the databases containing the primary data from the site investigations, and one or several site descriptive models, in which the collected information is interpreted and presented in a form which can be used in numerical models for rock engineering, environmental impact and long-term safety assessments. The site descriptive models are devised and stepwise updated as the site investigations proceed. The point of departure for this process is the regional site descriptive model, version 0, which is the subject of the present report. Version 0 is developed out of the information available at the start of the site investigation. This information, with the exception of data from tunnels and drill holes at the sites of the Forsmark nuclear reactors and the underground low-middle active radioactive waste storage facility, SFR, is mainly 2D in nature (surface data), and is general and regional, rather than site-specific, in content. For this reason, the Forsmark site descriptive model, version 0, as detailed in the present report, has been developed at a regional scale. It covers a rectangular area, 15 km in a southwest-northeast and 11 km in a northwest-southeast direction, around the

Adopción del rol maternal de la teorista Ramona Mercer al cuidado de enfermería binomio madre-hijo: reporte de caso en la unidad materno infantil

Directory of Open Access Journals (Sweden)

Laura Alvarado

2011-12-01

Full Text Available Introducción: Esta propuesta se centra en el papel maternal, donde la madre constituye un proceso de interacción y desarrollo. Cuando la madre logra el apego de su hijo, adquiere experiencia en su cuidado y experimenta la alegría y la gratificación de su papel. Mercer abarca varios factores maternales: edad, estado de salud, relación padre-madre y características del lactante. Además define la forma en que la madre percibe los acontecimientos vividos que influirán al momento de llevar los cuidados a su hijo con características innatas de su personalidad. Materiales y Métodos: Reporte de caso de una Usuaria con 30 años de edad, asiste a la unidad Materno Infantil por control de Ginecobstetricia donde se ordena ecografía obstétrica la cual reporta oligoamnios; es trasladada a cirugía para extracción de producto de sexo masculino por cesárea. En el puerperio tardío presenta dehiscencia de la herida quirúrgica. Resultados: Son diversas las actividades que desarrolla la enfermera para lograr cada vez mas una mejor situación de salud y por ende una mejor calidad de vida, con formación científica cumpliendo de ese modo con los criterios de la atención integral que implican la atención de lo físico, mental y espiritual. Discusión y Conclusiones: Es importante recalcar el cuidado materno perinatal de la profesión de enfermería que ejerce el rol desde diversos campos de acción y en las diferentes etapas de la procreación. La aplicación de esta teoría a la práctica asistencial sirvió como marco para la valoración, planificación, implantación y evaluación del cuidado del binomio madre – hijo, ayudando a simplificar un proceso muy complejo y facilitando su comprensión para la aplicación del mismo en la práctica. (Rev Cuid 2011; 2(2: 195-201.Palabras clave: Rol, Enfermería, Cuidado, Diagnóstico. (Fuente: DeCS BIREME.

48 CFR 52.214-21 - Descriptive Literature.

Science.gov (United States)

2010-10-01

... 48 Federal Acquisition Regulations System 2 2010-10-01 2010-10-01 false Descriptive Literature. 52....214-21 Descriptive Literature. As prescribed in 14.201-6(p)(1), insert the following provision: Descriptive Literature (APR 2002) (a) Descriptive literature, as used in this provision, means information...

Finger-Based Numerical Skills Link Fine Motor Skills to Numerical Development in Preschoolers.

Science.gov (United States)

Suggate, Sebastian; Stoeger, Heidrun; Fischer, Ursula

2017-12-01

Previous studies investigating the association between fine-motor skills (FMS) and mathematical skills have lacked specificity. In this study, we test whether an FMS link to numerical skills is due to the involvement of finger representations in early mathematics. We gave 81 pre-schoolers (mean age of 4 years, 9 months) a set of FMS measures and numerical tasks with and without a specific finger focus. Additionally, we used receptive vocabulary and chronological age as control measures. FMS linked more closely to finger-based than to nonfinger-based numerical skills even after accounting for the control variables. Moreover, the relationship between FMS and numerical skill was entirely mediated by finger-based numerical skills. We concluded that FMS are closely related to early numerical skill development through finger-based numerical counting that aids the acquisition of mathematical mental representations.

Study of the Evolution of the Electric Structure of a Convective Cloud Using the Data of a Numerical Nonstationary Three-Dimensional Model

Science.gov (United States)

Veremey, N. E.; Dovgalyuk, Yu. A.; Zatevakhin, M. A.; Ignatyev, A. A.; Morozov, V. N.

2014-04-01

Numerical nonstationary three-dimensional model of a convective cloud with parameterized description of microphysical processes with allowance for the electrization processes is considered. The results of numerical modeling of the cloud evolution for the specified atmospheric conditions are presented. The spatio-temporal distribution of the main cloud characteristics including the volume charge density and the electric field is obtained. The calculation results show that the electric structure of the cloud is different at its various life stages, i.e., it varies from unipolar to dipolar and then to tripolar. This conclusion is in fair agreement with the field studies.

Olkiluoto site description 2006

International Nuclear Information System (INIS)

Andersson, J.; Ahokas, H.; Hudson, J.A.

2007-03-01

This second version of the Olkiluoto Site Report, produced by the OMTF (Olkiluoto Modelling Task Force), updates the Olkiluoto Site Report 2004 (Posiva 2005) with the data and knowledge obtained up to December 2005. The main product of the modelling has been to develop a descriptive model of the site (the Site Descriptive Model), i.e. a model describing the geometry, properties of the bedrock and the water and the associated interacting processes and mechanisms. For practical reasons, the Site Descriptive Model is divided into five parts: surface system, geology, rock mechanics, hydrogeology and hydrogeochemistry, which are presented in individual chapters. Four separated models are presented: the geological, rock mechanics, hydrogeological and hydrogeochemical models. The consistency between the hydrogeological and hydrogeochemical models is assessed in a joint chapter. Chapter 1 presents an outline of the report, explains the background to its development and sets out its objectives and scope. It is also introduces and explains the integrated modelling methodology, the nomenclature used in the descriptions of the models and the prediction/outcome studies. Chapter 2 provides a brief overview of the data used for producing the Site Description. Chapters 3 to 8 present the descriptive modelling, which involves interpreting data, interpolating or extrapolating between measurement points and calibrating the model against data, based on the various assumptions made about each conceptual model. Chapter 9 presents the results of the prediction/outcome studies performed during 2005 and Chapter 10 the overall consistency and confidence assessment. Overall conclusions are provided in Chapter 11. The main advances since Site Report 2004 are: A new geological model is presented in Chapter 4, representing a significant change from Bedrock Model 2003/1. There has been extensive use of geological data, whereas hydrogeological data have deliberately not been used and more

Representation of Numerical and Non-Numerical Order in Children

Science.gov (United States)

Berteletti, Ilaria; Lucangeli, Daniela; Zorzi, Marco

2012-01-01

The representation of numerical and non-numerical ordered sequences was investigated in children from preschool to grade 3. The child's conception of how sequence items map onto a spatial scale was tested using the Number-to-Position task (Siegler & Opfer, 2003) and new variants of the task designed to probe the representation of the alphabet…

“El guardián de la salud”: Un juego de rol para promover hábitos saludables de vida y actividad física desde la Educación Física

Directory of Open Access Journals (Sweden)

Isaac J. Pérez López

2009-12-01

Full Text Available La nueva realidad que caracteriza a los adolescentes en la sociedad actual requiere que en el ámbito educativo se produzca una renovación de ideas en sus planteamientos, que logre construir nexos de unión entre sus objetivos fundamentales y las nuevas necesidades y valores del alumnado. Al mismo tiempo, a esto habría que añadir otro problema de gran repercusión social, que demanda actuaciones significativas desde el área de EF, como es el relacionado con la salud. Por ello, a continuación, se presenta un enfoque diferente a la hora de abordar los contenidos del bloque de salud, a partir de un recurso de gran atractivo entre los adolescentes: los Juegos de Rol, junto al apoyo de las Nuevas Tecnologías

Model potential for the description of metal/organic interface states

Science.gov (United States)

Armbrust, Nico; Schiller, Frederik; Güdde, Jens; Höfer, Ulrich

2017-01-01

We present an analytical one-dimensional model potential for the description of electronic interface states that form at the interface between a metal surface and flat-lying adlayers of π-conjugated organic molecules. The model utilizes graphene as a universal representation of these organic adlayers. It predicts the energy position of the interface state as well as the overlap of its wave function with the bulk metal without free fitting parameters. We show that the energy of the interface state depends systematically on the bond distance between the carbon backbone of the adayers and the metal. The general applicability and robustness of the model is demonstrated by a comparison of the calculated energies with numerous experimental results for a number of flat-lying organic molecules on different closed-packed metal surfaces that cover a large range of bond distances. PMID:28425444

Rol del profesional de Enfermería en terapias de reemplazo renal, diálisis peritoneal / Nursing’s Role in Renal Replacement Therapies, Peritoneal / Dialysis Papel do profissional de Enfermagem em terapias de substituição renal, diálise peritoneal

OpenAIRE

Maricel Licht-Ardila, Enf. Esp.; Jennifer Almeida-Arias, Enf.; Fabiola Bolívar-Salazar, Enf.; Yessica Galván-Mármol, Enf.; Silvia García-Trujillo, Enf.

2014-01-01

Introducción: La enfermedad renal crónica es considerada un problema de salud pública en el ámbito mundial, debido a su prevalencia e incidencia creciente en la población. El profesional de enfermería asiste al paciente con su patología de base e integra a la familia en la realización de actividades que contribuyen al cuidado y prevención de la enfermedad o a la recuperación de su salud, por lo que el rol principal está orientado a ayudar al paciente, a conservar o lograr su independencia y g...

Molecular basis of retinol anti-ageing properties in naturally aged human skin in vivo.

Science.gov (United States)

Shao, Y; He, T; Fisher, G J; Voorhees, J J; Quan, T

2017-02-01

Retinoic acid has been shown to improve the aged-appearing skin. However, less is known about the anti-ageing effects of retinol (ROL, vitamin A), a precursor of retinoic acid, in aged human skin in vivo. This study aimed to investigate the molecular basis of ROL anti-ageing properties in naturally aged human skin in vivo. Sun-protected buttock skin (76 ± 6 years old, n = 12) was topically treated with 0.4% ROL and its vehicle for 7 days. The effects of topical ROL on skin epidermis and dermis were evaluated by immunohistochemistry, in situ hybridization, Northern analysis, real-time RT-PCR and Western analysis. Collagen fibrils nanoscale structure and surface topology were analysed by atomic force microscopy. Topical ROL shows remarkable anti-ageing effects through three major types of skin cells: epidermal keratinocytes, dermal endothelial cells and fibroblasts. Topical ROL significantly increased epidermal thickness by stimulating keratinocytes proliferation and upregulation of c-Jun transcription factor. In addition to epidermal changes, topical ROL significantly improved dermal extracellular matrix (ECM) microenvironment; increasing dermal vascularity by stimulating endothelial cells proliferation and ECM production (type I collagen, fibronectin and elastin) by activating dermal fibroblasts. Topical ROL also stimulates TGF-β/CTGF pathway, the major regulator of ECM homeostasis, and thus enriched the deposition of ECM in aged human skin in vivo. 0.4% topical ROL achieved similar results as seen with topical retinoic acid, the biologically active form of ROL, without causing noticeable signs of retinoid side effects. 0.4% topical ROL shows remarkable anti-ageing effects through improvement of the homeostasis of epidermis and dermis by stimulating the proliferation of keratinocytes and endothelial cells, and activating dermal fibroblasts. These data provide evidence that 0.4% topical ROL is a promising and safe treatment to improve the naturally aged human skin

Evaluación de la Calidad de Vida tras el tratamiento primario del cáncer de mama Evaluation of the quality of life after the end of breast cancer primary treatment

Directory of Open Access Journals (Sweden)

María Rosario Domínguez Gil

2009-12-01

Full Text Available Objetivo: Evaluar la Calidad de Vida (CV de las pacientes intervenidas de cáncer de mama tras finalizar el tratamiento primario. Diseño: Estudio descriptivo transversal. Participantes: 71 pacientes, seleccionadas mediante un muestreo consecutivo. Instrumentos: Registro de datos sociodemográficos, y la versión española del cuestionario SF-36. Análisis de los datos: Mediante el programa SPSS 14.0, se realizó un análisis descriptivo de las variables, y la prueba de ANOVA (pAims: To evaluate the Quality of Life (QoL of patients submitted to breast cancer surgery, after the end of the primary treatment. Design: A descriptive transversal study. Participants: 71 patients, selected by a consecutive sampling. Instruments: Inventory of sociodemographic data, and the Spanish version of SF-36 questionnaire. Data Analysis: A descriptive analysis of every variable was made with the SPSS program, version 14.0. Also, to determine the impact of the types of surgery and treatment on the next QoL, ANOVA test was completed (p<.05. Results: Patients had a mean age of 52,86 years (DT=11,076, and 2,46 sons (DT=1,264. Also, a 56,3%. were married, the 69,1% were housekeepers, and had elementary studies the 48,6%. A 70,4% of patients had been submitted to mastectomy jointly lymphadenectomy, and the 42,3% had received chemotherapy associate with radiotherapy. The poorer health areas were the emotional rol, and vitality. The type of surgery was related to bodily pain (F= 3,546 and social functioning (F= 2,806, whereas the type of treatment was associated with the physical rol (F= 2,254. Conclusions: The primary treatment of breast cancer keeps incapacitating patients, around six to nine months after having finished it. Pain, and the secondary effects of treatment difficult patients to continue developing their activities normally. On the other hand, patients' new reality affects their health areas of emotional rol and vitality.

The fifth-order partial differential equation for the description of the α + β Fermi-Pasta-Ulam model

Science.gov (United States)

Kudryashov, Nikolay A.; Volkov, Alexandr K.

2017-01-01

We study a new nonlinear partial differential equation of the fifth order for the description of perturbations in the Fermi-Pasta-Ulam mass chain. This fifth-order equation is an expansion of the Gardner equation for the description of the Fermi-Pasta-Ulam model. We use the potential of interaction between neighbouring masses with both quadratic and cubic terms. The equation is derived using the continuous limit. Unlike the previous works, we take into account higher order terms in the Taylor series expansions. We investigate the equation using the Painlevé approach. We show that the equation does not pass the Painlevé test and can not be integrated by the inverse scattering transform. We use the logistic function method and the Laurent expansion method to find travelling wave solutions of the fifth-order equation. We use the pseudospectral method for the numerical simulation of wave processes, described by the equation.

A simple numerical model to estimate the effect of coal selection on pulverized fuel burnout

Energy Technology Data Exchange (ETDEWEB)

Sun, J.K.; Hurt, R.H.; Niksa, S.; Muzio, L.; Mehta, A.; Stallings, J. [Brown University, Providence, RI (USA). Division Engineering

2003-06-01

The amount of unburned carbon in ash is an important performance characteristic in commercial boilers fired with pulverized coal. Unburned carbon levels are known to be sensitive to fuel selection, and there is great interest in methods of estimating the burnout propensity of coals based on proximate and ultimate analysis - the only fuel properties readily available to utility practitioners. A simple numerical model is described that is specifically designed to estimate the effects of coal selection on burnout in a way that is useful for commercial coal screening. The model is based on a highly idealized description of the combustion chamber but employs detailed descriptions of the fundamental fuel transformations. The model is validated against data from laboratory and pilot-scale combustors burning a range of international coals, and then against data obtained from full-scale units during periods of coal switching. The validated model form is then used in a series of sensitivity studies to explore the role of various individual fuel properties that influence burnout.

Nuclear magnetic resonance provides a quantitative description of protein conformational flexibility on physiologically important time scales.

Science.gov (United States)

Salmon, Loïc; Bouvignies, Guillaume; Markwick, Phineus; Blackledge, Martin

2011-04-12

A complete description of biomolecular activity requires an understanding of the nature and the role of protein conformational dynamics. In recent years, novel nuclear magnetic resonance-based techniques that provide hitherto inaccessible detail concerning biomolecular motions occurring on physiologically important time scales have emerged. Residual dipolar couplings (RDCs) provide precise information about time- and ensemble-averaged structural and dynamic processes with correlation times up to the millisecond and thereby encode key information for understanding biological activity. In this review, we present the application of two very different approaches to the quantitative description of protein motion using RDCs. The first is purely analytical, describing backbone dynamics in terms of diffusive motions of each peptide plane, using extensive statistical analysis to validate the proposed dynamic modes. The second is based on restraint-free accelerated molecular dynamics simulation, providing statistically sampled free energy-weighted ensembles that describe conformational fluctuations occurring on time scales from pico- to milliseconds, at atomic resolution. Remarkably, the results from these two approaches converge closely in terms of distribution and absolute amplitude of motions, suggesting that this kind of combination of analytical and numerical models is now capable of providing a unified description of protein conformational dynamics in solution.

La relación entre las redes externas de trabajo y el desempeño innovador de las pymes colombianas: un análisis del rol moderador del ambiente industrial

Directory of Open Access Journals (Sweden)

Iván Darío Sánchez

2013-07-01

Full Text Available Los resultados de investigaciones que analizan la relación entre redes de trabajo y desempeño innovador de las organizaciones han sido inconsistentes. Este artículo contribuye a clarificar tal situación analizando el rol moderador de la munificencia ambiental en dicha relación. En una muestra de 4.133 pymes colombia- nas, y empleando un modelo Zero-Inflated Poisson, se halló una relación positiva entre redes e innovación, y negativa entre munificencia e innovación. En contra de lo esperado, se halló que a mayor munificencia am- biental, la vinculación entre redes e innovación se hace más fuerte. Estos hallazgos destacan el valor estra- tégico de la redes en el contexto del proceso de innovación de las pymes y el carácter idiosincrático de di- cho proceso en un país en desarrollo como Colombia.

A numerical tool for reproducing driver behaviour: experiments and predictive simulations.

Science.gov (United States)

Casucci, M; Marchitto, M; Cacciabue, P C

2010-03-01

This paper presents the simulation tool called SDDRIVE (Simple Simulation of Driver performance), which is the numerical computerised implementation of the theoretical architecture describing Driver-Vehicle-Environment (DVE) interactions, contained in Cacciabue and Carsten [Cacciabue, P.C., Carsten, O. A simple model of driver behaviour to sustain design and safety assessment of automated systems in automotive environments, 2010]. Following a brief description of the basic algorithms that simulate the performance of drivers, the paper presents and discusses a set of experiments carried out in a Virtual Reality full scale simulator for validating the simulation. Then the predictive potentiality of the tool is shown by discussing two case studies of DVE interactions, performed in the presence of different driver attitudes in similar traffic conditions.

Field and numerical descriptions of fracture geometries and terminations in chalk containing chert layers and inclusions; implications for groundwater flow in Danish chalk aquifers

Science.gov (United States)

Seyum, S.

2017-12-01

This study is a description of the fracture distribution in laterally discontinuous chalk and chert layers, with an investigation on how fracture lengths and apertures vary as a function of applied stresses, material properties, and interface properties. Natural fractures intersect laterally extensive, discontinuous, chalk-chert material interfaces in 62 million-year old to 72 million-year old Chalk Group formations exposed at Stevns Klint, Denmark. Approximately one-third of Denmark's fresh water use is from chalk and limestone regional aquifers of the Chalk Group formations, where rock permeability is dominantly a function of open fracture connectivities. Fractured, centimeter- to decimeter-thick chert layers and inclusions (101 GPa elastic stiffness) are interlayered with fractured, meter-thick chalk layers (100 GPa elastic stiffness). Fractures are observed to terminate against and cross chalk-chert interfaces, affecting the vertical flow of water and pollutants between aquifers. The discontinuous and variably thin nature of chert layers at Stevns Klint effectively merges adjacent fracture-confining layers of chalk along discrete position intervals, resulting in lateral variability of fracture spacing. Finite element numerical models are designed to describe fracture interactions with stiff, chert inclusions of various shapes, thicknesses, widths, orientations, and interface friction and fracture toughness values. The models are two-dimensional with isotropic, continuous material in plane strain and uniformly applied remote principal stresses. These characteristics are chosen based on interpretations of the petrophysics of chalk and chert, the burial history of the rock, and the scale of investigation near fracture tips relative to grain sizes. The result are value ranges for relative stiffness contrasts, applied stresses, and material interface conditions that would cause fractures to cross, terminate at, or form along chalk-chert interfaces, with emphasis on

A description of the reactor inventory module NECTAR-RICE

International Nuclear Information System (INIS)

Nair, S.

1984-06-01

This note describes the NECTAR-RICE module of the CEGB's NECTAR environmental code, which can be used to calculate the actinide and/or fission product inventories of irradiated nuclear fuel used as input to the calculation of the release source term to atmosphere for accidental releases. The range of actinide and fission product nuclides considered is large enough to permit studies to be made for virtually any irradiation history consisting of ad hoc combinations of irradiation and cooling periods. The actinide and fission product inventories are calculated for burnup periods using numerical methods best suited to this problem, while analytical solutions are used for cooling periods. The code can be used to perform a coupled actinide-fission product calculation, a solely actinide calculation or a solely fission product calculation. Output consists of inventories, activities, and γ spectra, among others. A brief description is also given of previous work in this field. (author)

Numerical investigation of tip clearance cavitation in Kaplan runners

Science.gov (United States)

Nikiforova, K.; Semenov, G.; Kuznetsov, I.; Spiridonov, E.

2016-11-01

There is a gap between the Kaplan runner blade and the shroud that makes for a special kind of cavitation: cavitation in the tip leakage flow. Two types of cavitation caused by the presence of clearance gap are known: tip vortex cavitation that appears at the core of the rolled up vortex on the blade suction side and tip clearance cavitation that appears precisely in the gap between the blade tip edge and the shroud. In the context of this work numerical investigation of the model Kaplan runner has been performed taking into account variable tip clearance for several cavitation regimes. The focus is put on investigation of structure and origination of mechanism of cavitation in the tip leakage flow. Calculations have been performed with the help of 3-D unsteady numerical model for two-phase medium. Modeling of turbulent flow in this work has been carried out using full equations of Navier-Stokes averaged by Reynolds with correction for streamline curvature and system rotation. For description of this medium (liquid-vapor) simplification of Euler approach is used; it is based on the model of interpenetrating continuums, within the bounds of this two- phase medium considered as a quasi-homogeneous mixture with the common velocity field and continuous distribution of density for both phases. As a result, engineering techniques for calculation of cavitation conditioned by existence of tip clearance in model turbine runner have been developed. The detailed visualization of the flow was carried out and vortex structure on the suction side of the blade was reproduced. The range of frequency with maximum value of pulsation was assigned and maximum energy frequency was defined; it is based on spectral analysis of the obtained data. Comparison between numerical computation results and experimental data has been also performed. The location of cavitation zone has a good agreement with experiment for all analyzed regimes.

Automated smoother for the numerical decoupling of dynamics models.

Science.gov (United States)

Vilela, Marco; Borges, Carlos C H; Vinga, Susana; Vasconcelos, Ana Tereza R; Santos, Helena; Voit, Eberhard O; Almeida, Jonas S

2007-08-21

Structure identification of dynamic models for complex biological systems is the cornerstone of their reverse engineering. Biochemical Systems Theory (BST) offers a particularly convenient solution because its parameters are kinetic-order coefficients which directly identify the topology of the underlying network of processes. We have previously proposed a numerical decoupling procedure that allows the identification of multivariate dynamic models of complex biological processes. While described here within the context of BST, this procedure has a general applicability to signal extraction. Our original implementation relied on artificial neural networks (ANN), which caused slight, undesirable bias during the smoothing of the time courses. As an alternative, we propose here an adaptation of the Whittaker's smoother and demonstrate its role within a robust, fully automated structure identification procedure. In this report we propose a robust, fully automated solution for signal extraction from time series, which is the prerequisite for the efficient reverse engineering of biological systems models. The Whittaker's smoother is reformulated within the context of information theory and extended by the development of adaptive signal segmentation to account for heterogeneous noise structures. The resulting procedure can be used on arbitrary time series with a nonstationary noise process; it is illustrated here with metabolic profiles obtained from in-vivo NMR experiments. The smoothed solution that is free of parametric bias permits differentiation, which is crucial for the numerical decoupling of systems of differential equations. The method is applicable in signal extraction from time series with nonstationary noise structure and can be applied in the numerical decoupling of system of differential equations into algebraic equations, and thus constitutes a rather general tool for the reverse engineering of mechanistic model descriptions from multivariate experimental

Numerical and experimental study of expiratory flow in the case of major upper airway obstructions with fluid structure interaction

Science.gov (United States)

Chouly, F.; van Hirtum, A.; Lagrée, P.-Y.; Pelorson, X.; Payan, Y.

2008-02-01

This study deals with the numerical prediction and experimental description of the flow-induced deformation in a rapidly convergent divergent geometry which stands for a simplified tongue, in interaction with an expiratory airflow. An original in vitro experimental model is proposed, which allows measurement of the deformation of the artificial tongue, in condition of major initial airway obstruction. The experimental model accounts for asymmetries in geometry and tissue properties which are two major physiological upper airway characteristics. The numerical method for prediction of the fluid structure interaction is described. The theory of linear elasticity in small deformations has been chosen to compute the mechanical behaviour of the tongue. The main features of the flow are taken into account using a boundary layer theory. The overall numerical method entails finite element solving of the solid problem and finite differences solving of the fluid problem. First, the numerical method predicts the deformation of the tongue with an overall error of the order of 20%, which can be seen as a preliminary successful validation of the theory and simulations. Moreover, expiratory flow limitation is predicted in this configuration. As a result, both the physical and numerical models could be useful to understand this phenomenon reported in heavy snorers and apneic patients during sleep.

Convergence of Numerical Sequences--A Commentary on "The Vice: Some Historically Inspired and Proof Generated Steps to Limits of Sequences" by R. P. Burn

Science.gov (United States)

Berge, Analia

2006-01-01

Burn (2005) proposes a "genetic approach" to teaching limits of numerical sequences. The article includes an explanation of the Method of Exhaustion, a generalization of this method, and a description of how this method was used for obtaining areas and lengths in the seventeenth century. The author uses these historical and mathematical analyses…

Numerical Coupling and Simulation of Point-Mass System with the Turbulent Fluid Flow

Science.gov (United States)

Gao, Zheng

A computational framework that combines the Eulerian description of the turbulence field with a Lagrangian point-mass ensemble is proposed in this dissertation. Depending on the Reynolds number, the turbulence field is simulated using Direct Numerical Simulation (DNS) or eddy viscosity model. In the meanwhile, the particle system, such as spring-mass system and cloud droplets, are modeled using the ordinary differential system, which is stiff and hence poses a challenge to the stability of the entire system. This computational framework is applied to the numerical study of parachute deceleration and cloud microphysics. These two distinct problems can be uniformly modeled with Partial Differential Equations (PDEs) and Ordinary Differential Equations (ODEs), and numerically solved in the same framework. For the parachute simulation, a novel porosity model is proposed to simulate the porous effects of the parachute canopy. This model is easy to implement with the projection method and is able to reproduce Darcy's law observed in the experiment. Moreover, the impacts of using different versions of k-epsilon turbulence model in the parachute simulation have been investigated and conclude that the standard and Re-Normalisation Group (RNG) model may overestimate the turbulence effects when Reynolds number is small while the Realizable model has a consistent performance with both large and small Reynolds number. For another application, cloud microphysics, the cloud entrainment-mixing problem is studied in the same numerical framework. Three sets of DNS are carried out with both decaying and forced turbulence. The numerical result suggests a new way parameterize the cloud mixing degree using the dynamical measures. The numerical experiments also verify the negative relationship between the droplets number concentration and the vorticity field. The results imply that the gravity has fewer impacts on the forced turbulence than the decaying turbulence. In summary, the

A comparison between averaged spikes and individual visually-analyzed spikes in rolandic epileptiform discharges Comparação por análise visual entre as espículas promediadas e as espículas individuais nas descargas epileptiformes rolândicas

Directory of Open Access Journals (Sweden)

Nadia I.O. Braga

2002-09-01

Full Text Available PURPOSE:This study compared some morphological features of individual rolandic epileptiform discharges, used to obtain an averaged estimate, with those of the resulting estimate. METHOD: Twenty-four averaged discharges from EEGs of 24 children showing rolandic spikes were compared with 480 individual discharges used in the averaging. The analysis was based on the occurrence of tangential dipole and "double spike" patterns. RESULTS: In 15 averaged discharges the tangential dipole pattern was found. Individual spikes used in the averaging process displayed the same pattern in 35-100% of them; in the remaining 9 averaged discharges, up to 20% of the individual spikes showed the same pattern, although this was not found in the averaged waveforms. "Double spike" pattern was found in 11 of the averaged waveforms and was recognized in 50-100% of its individual discharges, whereas up to 45% of individual spikes showed this pattern without expression in the averaged waveform. CONCLUSION: When visually analyzing an EEG with rolandic spikes, caution should be exercised in characterizing these patterns, since a few discharges showing them may not be expressed in the averaged waveform and the clinical correlations proposed for these patterns may not apply.OBJETIVO: Comparar as características morfológicas das descargas epileptiformes rolândicas individuais usadas para se obter uma descarga promediada com a resultante promediada. MÉTODO: Vinte e quatro descargas promediadas dos EEG de 24 crianças com descargas epileptiformes rolândicas foram comparadas com as 480 descargas individuais utilizadas na promediação. A análise foi baseada na ocorrência de dipolo tangencial e "dupla espícula". RESULTADOS: Em 15 descargas promediadas o dipolo tangencial estava presente. As espículas individuais usadas na promediação mostraram o mesmo padrão em 35-100% das descargas. Nas 9 descargas promediadas restantes, até 20% das descargas individuais apresentavam

Seismic wave propagation in heterogeneous multiphasic media: numerical modelling, sensibility and inversion of poro-elastic parameters

International Nuclear Information System (INIS)

Dupuy, B.

2011-11-01

Seismic wave propagation in multiphasic porous media have various environmental (natural risks, geotechnics, groundwater pollutions...) and resources (aquifers, oil and gas, CO 2 storage...) issues. When seismic waves are crossing a given material, they are distorted and thus contain information on fluid and solid phases. This work focuses on the characteristics of seismic waves propagating in multiphasic media, from the physical complex description to the parameter characterisation by inversion, including 2D numerical modelling of the wave propagation. The first part consists in the description of the physics of multiphasic media (each phase and their interactions), using several up-scaling methods, in order to obtain an equivalent mesoscale medium defined by seven parameters. Thus, in simple porosity saturated media and in complex media (double porosity, patchy saturation, visco-poro-elasticity), I can compute seismic wave propagation without any approximation. Indeed, I use a frequency-space domain for the numerical method, which allows to consider all the frequency dependent terms. The spatial discretization employs a discontinuous finite elements method (discontinuous Galerkin), which allows to take into account complex interfaces.The computation of the seismic attributes (velocities and attenuations) of complex porous media shows strong variations in respect with the frequency. Waveforms, computed without approximation, are strongly different if we take into account the full description of the medium or an homogenisation by averages. The last part of this work deals with the poro-elastic parameters characterisation by inversion. For this, I develop a two-steps method: the first one consists in a classical inversion (tomography, full waveform inversion) of seismograms data to obtain macro-scale parameters (seismic attributes). The second step allows to recover, from the macro-scale parameters, the poro-elastic micro-scale properties. This down-scaling step

Numerical distance protection

CERN Document Server

Ziegler, Gerhard

2011-01-01

Distance protection provides the basis for network protection in transmission systems and meshed distribution systems. This book covers the fundamentals of distance protection and the special features of numerical technology. The emphasis is placed on the application of numerical distance relays in distribution and transmission systems.This book is aimed at students and engineers who wish to familiarise themselves with the subject of power system protection, as well as the experienced user, entering the area of numerical distance protection. Furthermore it serves as a reference guide for s

Numerical methods using Matlab

CERN Document Server

Lindfield, George

2012-01-01

Numerical Methods using MATLAB, 3e, is an extensive reference offering hundreds of useful and important numerical algorithms that can be implemented into MATLAB for a graphical interpretation to help researchers analyze a particular outcome. Many worked examples are given together with exercises and solutions to illustrate how numerical methods can be used to study problems that have applications in the biosciences, chaos, optimization, engineering and science across the board. Numerical Methods using MATLAB, 3e, is an extensive reference offering hundreds of use

Numerical computation of underwater explosions due to fuel-coolant interactions

International Nuclear Information System (INIS)

Lee, J.H.S.; Frost, D.L.; Knystautas, R.; Teodorczyk, A.; Ciccarelli, G.; Thibault, P.; Penrose, J.

1989-03-01

If coarse molten material is released into a coolant the possibility exists for a violent steam explosion. A detailed quantitative description of the processes involved in steam explosions is currently beyond the capabilities of the scientific community. However, a conservative estimate of the pressure transients resulting from a steam explosion can be obtained by studying the dynamics of the shock associated with the expansion of a high-pressure vapour bubble. In this study, the hydrodynamic equations governing the shock propagation of an expanding bubble were integrated numerically using the Flux Corrected Transport code. Simpler acoustic models based on experience with underwater explosions were also developed and used to estimate pressure transients and to calculate the peak pressures for benchmark cases. The results were found to be an order of magnitude higher than the corresponding pressures obtained using a complex model developed by Henry. A simplified version of the Henry model was developed by neglecting the complex description of the two-phase flow inside the ruptured tube and the arbitrarily assumed heat transfer and condensation rates. Results from the simplified model were found to be generally similar to, but had higher peak pressures than those obtained using the Henry model. It is concluded that the results produced by simple acoustic models, or by a simplified Henry model, are more conservative than the corresponding results obtained with the original Henry model

Audio Description as a Pedagogical Tool

Directory of Open Access Journals (Sweden)

Georgina Kleege

2015-05-01

Full Text Available Audio description is the process of translating visual information into words for people who are blind or have low vision. Typically such description has focused on films, museum exhibitions, images and video on the internet, and live theater. Because it allows people with visual impairments to experience a variety of cultural and educational texts that would otherwise be inaccessible, audio description is a mandated aspect of disability inclusion, although it remains markedly underdeveloped and underutilized in our classrooms and in society in general. Along with increasing awareness of disability, audio description pushes students to practice close reading of visual material, deepen their analysis, and engage in critical discussions around the methodology, standards and values, language, and role of interpretation in a variety of academic disciplines. We outline a few pedagogical interventions that can be customized to different contexts to develop students' writing and critical thinking skills through guided description of visual material.

Las muchachas ahorrativas: El rol de las mujeres peronistas en el Plan Económico de Austeridad y el 2º Plan Quinquenal

Directory of Open Access Journals (Sweden)

Carolina Barry

2004-11-01

Full Text Available En este trabajo propongo analizar el rol asignado a las mujeres peronistas y a las unidades básicas femeninas del Partido Peronista Femenino como promotoras del ahorro y la economía doméstica dentro del Plan Económico de Austeridad y el 2º Plan Quinquenal. Luego de la amplia confirmación de la popularidad del gobierno obtenida en las elecciones de noviembre de 1951, el presidente Perón consideró oportuno producir una rectificación y un ajuste en el rumbo de la política económica. Se trataba de una serie de medidas imprescindibles para superar una coyuntura que se tornaba crítica, y que se resumían en el aumento de la producción y la austeridad en el consumo. Esta última responsabilidad recayó en la mujeres - amas de casa amparadas en la acción de las unidades básicas femeninas que actuaron como consejeras y promotoras de los planes de austeridad implementando una serie de medidas que iban desde la cursos de cocina que enseñaban a cocinar con productos alternativos y más económicos hasta la fiscalización de los comercios que no cumplían con los precios máximos oficiales.

4 CFR 202.1 - Description.

Science.gov (United States)

2010-01-01

... further encircled by a ring bearing the gold-colored words “RECOVERY ACCOUNTABILITY AND TRANSPARENCY... 4 Accounts 1 2010-01-01 2010-01-01 false Description. 202.1 Section 202.1 Accounts RECOVERY ACCOUNTABILITY AND TRANSPARENCY BOARD OFFICIAL SEAL § 202.1 Description. (a) The official seal of the Recovery...

A numerical investigation on piezoresistive behaviour of carbon nanotube/polymer composites: mechanism and optimizing principle

International Nuclear Information System (INIS)

Wang Zhifeng; Ye Xiongying

2013-01-01

Carbon nanotubes (CNTs) filled polymeric composites can be used as a kind of flexible piezoresistive material in potentially many fields. Due to the diversity of CNTs and polymers, the mechanism and features of their piezoresistive behaviour is still not fully understood. This paper reports our investigations into the mechanism and optimization of piezoresistive CNT/polymer composites. Numerical simulation results showed that the junction resistances between CNTs are a major component of the network conductance of the composite as well as the piezoresistive behaviour. Average junction gap variation (AJGV) was introduced as a quantitative description of the conductance variation of a CNT network caused by strain and the conductance variation of the CNT network was found to be dominated by AJGV. Numerical simulation and analytical results indicated that the key parameters affecting AJGV include the orientation and diameter of CNTs, Poisson’s ratio of the polymer, and the concentration of CNTs in the polymer matrix. An optimizing principle was then given for piezoresistive CNT/polymer composites. (paper)

Natural transformation in plant breeding - a biotechnological platform for quality improvement of ornamental, agricultural and medicinal plants

DEFF Research Database (Denmark)

Lütken, Henrik Vlk; Hegelund, Josefine Nymark; Himmelboe, Martin

2015-01-01

Compactness is a desirable trait in ornamental plant breeding because it is preferred by producers, distributors and consumers. Presently, in ornamental plant production growth of many potted plants is regulated by application of chemical growth retardants, several of which are harmful to both...... (rol)-genes rolA, rolB, rolC and rolD among 18 ORFs, into the plant genome. Infection of plants by A. rhizogenes induces hairy roots, from which shoots containing rol-genes can be regenerated. Natural transformation with A. rhizogenes reveals very promising results in several plant species and can...... be useful in a broader range of application than ornamental breeding. One important aspect of this technology is that the hairy roots can be used directly in the selection proceß as a primary indicator of a succeßful transformation. Thus the technology avoids use of undesired antibiotic resistance marker...

Quantum Description of Optical Devices Used in Interferometry

Directory of Open Access Journals (Sweden)

P. Kucera

2007-09-01

Full Text Available A quantum-mechanical description of the phase shifters, retarders, mirrors and beam splitters is given in the paper. The description is then applied on two types of states. On a coherent state, a classical-like state, and on a number state, hence the strict quantum state. The quantum description of a beam splitter can be found in the literature. However the description does not treat with the polarization concept. The paper is aimed to introduce quantum description of an arbitrary oriented retarder and give a description of a beam splitter which treats with the polarization.

Soft Biometrics; Human Identification Using Comparative Descriptions.

Science.gov (United States)

Reid, Daniel A; Nixon, Mark S; Stevenage, Sarah V

2014-06-01

Soft biometrics are a new form of biometric identification which use physical or behavioral traits that can be naturally described by humans. Unlike other biometric approaches, this allows identification based solely on verbal descriptions, bridging the semantic gap between biometrics and human description. To permit soft biometric identification the description must be accurate, yet conventional human descriptions comprising of absolute labels and estimations are often unreliable. A novel method of obtaining human descriptions will be introduced which utilizes comparative categorical labels to describe differences between subjects. This innovative approach has been shown to address many problems associated with absolute categorical labels-most critically, the descriptions contain more objective information and have increased discriminatory capabilities. Relative measurements of the subjects' traits can be inferred from comparative human descriptions using the Elo rating system. The resulting soft biometric signatures have been demonstrated to be robust and allow accurate recognition of subjects. Relative measurements can also be obtained from other forms of human representation. This is demonstrated using a support vector machine to determine relative measurements from gait biometric signatures-allowing retrieval of subjects from video footage by using human comparisons, bridging the semantic gap.

Upscaling of permeability field of fractured rock system: Numerical examples

KAUST Repository

Bao, K.; Salama, Amgad; Sun, S.

2012-01-01

When the permeability field of a given porous medium domain is heterogeneous by the existence of randomly distributed fractures such that numerical investigation becomes cumbersome, another level of upscaling may be required. That is such complex permeability field could be relaxed (i.e., smoothed) by constructing an effective permeability field. The effective permeability field is an approximation to the real permeability field that preserves certain quantities and provides an overall acceptable description of the flow field. In this work, the effective permeability for a fractured rock system is obtained for different coarsening scenarios starting from very coarse mesh all the way towards the fine mesh simulation. In all these scenarios, the effective permeability as well as the pressure at each cell is obtained. The total flux at the exit boundary is calculated in all these cases, and very good agreement is obtained.

On the constitutive description of the microinteractions concept in steam explosions

Energy Technology Data Exchange (ETDEWEB)

Chen, X.; Yuen, W.W.; Theofanous, T.G. [Univ. of California, Santa Barbara, CA (United States)

1995-09-01

This paper elaborates on the constitutive description of the {open_quotes}microinteraction{close_quotes} model used by the computer code ESPROSE.m to simulate the propagation phase of steam explosions. The approach is based on a series of experiments, in the SIGMA-2000 facility, involving molten drops of tin made to explode under sustained pressure fields; an environment similar to that of a fully-developed large-scale detonation. The experimental ranges cover shock pressures of up to 204 bar, melt temperatures of up to 1800{degrees}C, and series of isothermal runs, using gallium drops, are also included. The results indicate that, to a first approximation, the basic form of the constitutive laws hypothesized in the original formulation of ESPROSE.m is appropriate. Moreover, through detailed comparison of data with numerical experiments, certain parameters appearing in these laws could be identified quantitatively.

Numerical analysis

CERN Document Server

Brezinski, C

2012-01-01

Numerical analysis has witnessed many significant developments in the 20th century. This book brings together 16 papers dealing with historical developments, survey papers and papers on recent trends in selected areas of numerical analysis, such as: approximation and interpolation, solution of linear systems and eigenvalue problems, iterative methods, quadrature rules, solution of ordinary-, partial- and integral equations. The papers are reprinted from the 7-volume project of the Journal of Computational and Applied Mathematics on '/homepage/sac/cam/na2000/index.html<

48 CFR 14.202-5 - Descriptive literature.

Science.gov (United States)

2010-10-01

... 48 Federal Acquisition Regulations System 1 2010-10-01 2010-10-01 false Descriptive literature. 14... CONTRACTING METHODS AND CONTRACT TYPES SEALED BIDDING Solicitation of Bids 14.202-5 Descriptive literature. (a) Policy. Contracting officers must not require bidders to furnish descriptive literature unless it is...

48 CFR 514.202-5 - Descriptive literature.

Science.gov (United States)

2010-10-01

... 48 Federal Acquisition Regulations System 4 2010-10-01 2010-10-01 false Descriptive literature... CONTRACTING METHODS AND CONTRACT TYPES SEALED BIDDING Solicitation of Bids 514.202-5 Descriptive literature... FAR 52.211-6 satisfies the requirement for descriptive literature. [74 FR 47739, Sept. 17, 2009] ...

The geometry description markup language

International Nuclear Information System (INIS)

Chytracek, R.

2001-01-01

Currently, a lot of effort is being put on designing complex detectors. A number of simulation and reconstruction frameworks and applications have been developed with the aim to make this job easier. A very important role in this activity is played by the geometry description of the detector apparatus layout and its working environment. However, no real common approach to represent geometry data is available and such data can be found in various forms starting from custom semi-structured text files, source code (C/C++/FORTRAN), to XML and database solutions. The XML (Extensible Markup Language) has proven to provide an interesting approach for describing detector geometries, with several different but incompatible XML-based solutions existing. Therefore, interoperability and geometry data exchange among different frameworks is not possible at present. The author introduces a markup language for geometry descriptions. Its aim is to define a common approach for sharing and exchanging of geometry description data. Its requirements and design have been driven by experience and user feedback from existing projects which have their geometry description in XML

Numerical modeling of plasma plume evolution against ambient background gas in laser blow off experiments

International Nuclear Information System (INIS)

Patel, Bhavesh G.; Das, Amita; Kaw, Predhiman; Singh, Rajesh; Kumar, Ajai

2012-01-01

Two dimensional numerical modelling based on simplified hydrodynamic evolution for an expanding plasma plume (created by laser blow off) against an ambient background gas has been carried out. A comparison with experimental observations shows that these simulations capture most features of the plasma plume expansion. The plume location and other gross features are reproduced as per the experimental observation in quantitative detail. The plume shape evolution and its dependence on the ambient background gas are in good qualitative agreement with the experiment. This suggests that a simplified hydrodynamic expansion model is adequate for the description of plasma plume expansion.

Rol de las células estrelladas hepáticas en la respuesta inflamatoria-fibrótica de la esquistosomiasis murina | Role of hepatic stellate cells in the inflammatory-fibrotic response murine schistosomiasis

Directory of Open Access Journals (Sweden)

Eva Velásquez Bolívar

2017-10-01

Full Text Available Las Células Estrelladas Hepáticas (HSCs son una de las principales fuentes de colágeno en el hígado y juegan un papel crucial en la fibrogénesis inducida por los esquistosomas. Las HSCs en reposo funcionan principalmente almacenando la vitamina A, pero en respuesta a la lesión del tejido hepático, se activan y sufren transdiferenciación a miofibroblastos, que se caracterizan por la producción de la matriz extracelular (ECM, componentes ricos en colágenos fibrilares. En la esquistosomiasis, se desarrolla una respuesta inflamatoria granulomatosa fibrogénica dirigida principalmente contra los huevos de esquistosoma, resultando en la patología hepática asociada con la enfermedad. En el proceso, el rol de las HSCs ha sido estudiado de manera no concluyente, tanto en la esquistosomiasis como en otras parasitosis. En la infección por Schistosoma mansoni, se conoce que ellas están presentes en su estado activado (miofibroblastos, en el borde fibrótico del granuloma hepático. Por contraste, en otras patologías, se ha demostrado que la expresión y activación de estas células conduce a la progresión de la fibrogénesis, pudiendo provocar cáncer hepático. Así mismo, su baja expresión y activación está asociado a la disminución de la fibrogénesis y la posible limitación de la patología. La fibrogénesis y la inmunopatogénesis causada por S. mansoni, estudiada en modelos murinos, puede tener amplias implicaciones para la salud humana; en última instancia, se traduce en una estrategia eficaz de intervención de la esquistosomiasis, así como también para otras enfermedades granulofibróticas hepáticas que puedan inducir cáncer en este tejido. Por tal motivo, la presente revisión describe el rol de las células estrelladas hepáticas en la respuesta inflamatoria-fibrótica de la esquistosomiasis murina.

El rol del monstruo en las narraciones audiovisuales dirigidas a los niños y niñas. Un análisis semiótico cultural a través del dibujo infantil

Directory of Open Access Journals (Sweden)

Pedro Chacón

2015-02-01

Full Text Available Esta investigación, basándose en los resultados de un estudio piloto que revelaba la importancia del monstruo como personaje para los niños/as de entre 5 y 6 años, se focaliza en el análisis de esta figura como arquetipo recurrente en los productos de la cultura visual infantil contemporánea. Para ello, la metodología empleada se divide en dos etapas diferenciadas: Una primera fase analítica –que pretende ahondar en los significados otorgados a esta figura en el audiovisual infantil de las últimas décadas– y una segunda fase empírica –que se sirve del dibujo infantil, la entrevista desestructurada y el análisis semiótico cultural para observar cómo interpretan los niños/as el rol de este personaje en las historias o narraciones de las que son receptores–. Como resultado se elabora una clasificación que agrupa bajo una serie de categorías básicas, las que podrían ser las variantes más importantes de este personaje dentro del audiovisual infantil. Posteriormente, se comparan estas tipologías definidas con los dibujos realizados por 41 niños/as de Educación Infantil de la ciudad de Granada. En base a esa comparativa se pone de manifiesto, no sólo que el monstruo constituye un símbolo cultural concreto dentro del audiovisual infantil, sino también que los niños/as más pequeños son perfectamente capaces de asimilar los diferentes papeles que éste desempeña dentro de las narraciones.Cómo referenciar este artículo Chacón, P., Morales, X. (2015. El rol del monstruo en las narraciones audiovisuales dirigidas a los niños y niñas. Un análisis semiótico cultural a través del dibujo infantil. Foro de Educación, 13(18, pp. 51-68. doi: http://dx.doi.org/10.14516/fde.2015.013.018.003

El rol de los profesionales de la salud en la atención primaria en salud (APS / The role of health care professionals in primary health care (PHC

Directory of Open Access Journals (Sweden)

Álvaro Franco-Giraldo

2015-10-01

Full Text Available Resumen Objetivo:este artículo presenta una revisión crítica para desentrañar el rol de los profesionales de la salud en atención primaria en salud. Metodología:mediante revisión narrativa se analizan conceptos de atención primaria en salud, sus conexiones con diferentes modelos de salud, el papel del equipo de salud tanto en la Atención Primaria en Salud como en sus diferentes enfoques. La revisión se amplía a las funciones del profesional de la salud en este campo y del médico general, en particular, así como sobre su accionar y capacitación. Discusión: se argumenta a partir de algunas preguntas sobre cuál es el papel de los profesionales de la salud en el sistema y el rol que deben jugar en la atención primaria y en la organización de los servicios de salud. Se particulariza en el sistema de salud colombiano y se hace énfasis en el cambio que se requiere del médico general, históricamente más ligado a la clínica y al hegemonismo del modelo biomédico. Conclusión: se presenta un boceto sobre la formación para las nuevas demandas en el actual momento, en tres dimensiones macro, meso y micro de la realidad sociosanitaria, sin desconocer las limitaciones estructurales del sistema colombiano que lo afectarán./ Abstract Objective: this paper presents a critical review of the role of health professionals in primary health care. Methodology: narrative review concepts of primary health care, their connections with different models of health, the role of the health team in both the Primary Health Care and its various approaches. The revision expands the functions of the healthcare professional in this field and the general practitioner, in particular, as well as their actions and training. Discussion: it is argued from some questions about what the role of health professionals in the system and the role it should play in primary care and the organization of health services. It is particularized in the Colombian health system

Semantic foundation for preferential description logics

CSIR Research Space (South Africa)

Britz, K

2011-12-01

Full Text Available Description logics are a well-established family of knowledge representation formalisms in Artificial Intelligence. Enriching description logics with non-monotonic reasoning capabilities, especially preferential reasoning as developed by Lehmann...

El rol de los cuidadores intrafamiliares adultos y su desempeño en la sociedad actual

Directory of Open Access Journals (Sweden)

Peña Aristizábal Sara Lucila

1996-12-01

Full Text Available

The work of intrafamily takecare shows excess tire, frustration, dislike, stereotype. The professional nurse requieres to know his or her characteristics and conflicts to definy the right strategies more than a roll correspond to a necessary function and to exert by organization the work of intrafamily takecare. It must be recognized the self government of the subject of takecare during the process of interactivic learning. The focus must be recognized a social pouring or altruist and that individual or egoist. The take care rebuild their own identity in the way of origen -blike together- condicioning their selfesteem to fall or success while the object of takecare does an old learning, observating and modeling the behaviour of the takecare to determine that and not rights; the health institutions don't care to this aspect in systematic way, and is priority under the focus preventive to know about phenomenons to affect the personality structure and the interpersonal relations to the inside of the nucleus of family organized.

La labor del cuidador intrafamiliar suele mostrar excesivo desgaste, frustración, displacer y estereotipia. El profesional de la enfermería requiere de conocer sus características y conflictos para definir las estrategias adecuadas. Más que un rol, corresponde a una función, necesaria y ejercida por un organismo, la labor del C.I. Se debe reconocer la autonomía del sujeto de cuidado en el proceso de aprendizaje interactivo. El enfoque debe reconocer una vertiente social, o altruista y aquella individual o egoísta. El C.I. reconstruye su propia identidad, en sentido origen-convivencia, condicionando su autoestima al fracaso o éxito, en tanto que el sujeto de cuidado, hace un aprendizaje vicario, observacional y de modelamiento, de las conductas del cuidador para determinar aquellas viables y no acertadas. Las instituciones de salud no se ocupan de este aspecto en forma sistemática, siendo prioritario bajo el

Numeral-Incorporating Roots in Numeral Systems: A Comparative Analysis of Two Sign Languages

Science.gov (United States)

Fuentes, Mariana; Massone, Maria Ignacia; Fernandez-Viader, Maria del Pilar; Makotrinsky, Alejandro; Pulgarin, Francisca

2010-01-01

Numeral-incorporating roots in the numeral systems of Argentine Sign Language (LSA) and Catalan Sign Language (LSC), as well as the main features of the number systems of both languages, are described and compared. Informants discussed the use of numerals and roots in both languages (in most cases in natural contexts). Ten informants took part in…

Dual descriptions of supersymmetry breaking

International Nuclear Information System (INIS)

Intrilligator, K.; Thomas, S.

1996-08-01

Dynamical supersymmetry breaking is considered in models which admit descriptions in terms of electric, confined, or magnetic degrees of freedom in various limits. In this way, a variety of seemingly different theories which break supersymmetry are actually interrelated by confinement or duality. Specific examples are given in which there are two dual descriptions of the supersymmetry breaking ground state

Experiment list: SRX150570 [Chip-atlas[Archive

Lifescience Database Archive (English)

Full Text Available osis=Fibrocystic Disease 64692659,93.8,19.3,37417 GSM935491: Harvard ChipSeq MCF10A-Er-Src 4OHTAM 1uM 4hr c-Myc Harvard... Control source_name=MCF10A-Er-Src || biomaterial_provider=Struhl laboratory || lab=Harvard || la...ntibody vendorname=Santa Cruz Biotech || antibody vendorid=sc-764 || control=Harvard_Control || control desc...ription=input library was prepared at Harvard. || control=Harvard_Control || cont...rol description=input library was prepared at Harvard. || controlid=wgEncodeEH002871 || replicate=1 http://d

El rol del capital social del emprendedor en la expansión exitosa de una start-up. el caso de hipertexto ltda. – “la librería de la u”1,2

Directory of Open Access Journals (Sweden)

Ruth Esperanza Román Castillo

2009-10-01

Full Text Available En este artículo se pretende identificar el rol del capital social del emprendedor de la empresa Hipertexto Ltda., en el proceso de consolidación y posicionamiento de esta en el sector editorial. El método de caso es empleado para identificar un conjunto de variables potenciadoras del capital social del emprendedor, para luego proponer sus efectos sobre el desempeño empresarial. Como resultado final se formula un conjunto de proposiciones de investigación que pretenden contribuir a la comprensión del fenómeno de interés, y se propone un modelo de síntesis de la dinámica del intercambio producido entre el capital social analizado individual y organizacionalmente, mostrándose cómo dicha dinámica conduce al fortalecimiento del capital social organizacional como ventaja competitiva sostenible de la empresa.

Effects of wastewater discharge on formation of Fe plaque on root surface and radial oxygen loss of mangrove roots

Energy Technology Data Exchange (ETDEWEB)

Pi, N. [Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Kowloon (Hong Kong); Tam, N.F.Y., E-mail: bhntam@cityu.edu.h [Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Kowloon (Hong Kong); Wong, M.H. [Croucher Institute for Environmental Sciences, Baptist University of Hong Kong, Kowloon Tong, Kowloon (Hong Kong)

2010-02-15

Effects of wastewater discharge on radial oxygen loss (ROL), formation of iron (Fe) plaque on root surface, and their correlations in Bruguiera gymnorrhiza (L.) Poir and Excoecaria agallocha L. were investigated. ROL along a lateral root increased more rapidly in control than that in strong wastewater (with pollutant concentrations ten times of that in municipal sewage, 10NW) treatment, but less Fe plaque was formed in control for both plants. For B. gymnorrhiza receiving 10NW, Fe plaque formation was more at basal and mature zones than at root tip, while opposite trend was shown in E. agallocha. At day 0, the correlation between ROL and Fe plaque was insignificant, but negative and positive correlations were found in 10NW and control, respectively, at day 105, suggesting that more ROL was induced leading to more Fe plaque. However, excess Fe plaque also served as a 'barrier' to prevent excessive ROL in 10NW plants. - Correlation between Fe plaque formation and ROL.

Description, prescription and the choice of discount rates

International Nuclear Information System (INIS)

Baum, Seth D.

2009-01-01

The choice of discount rates is a key issue in the analysis of long-term societal issues, in particular environmental issues such as climate change. Approaches to choosing discount rates are generally placed into two categories: the descriptive approach and the prescriptive approach. The descriptive approach is often justified on grounds that it uses a description of how society discounts instead of having analysts impose their own discounting views on society. This paper analyzes the common forms of the descriptive and prescriptive approaches and finds that, in contrast with customary thinking, both forms are equally descriptive and prescriptive. The prescriptions concern who has standing (i.e. who is included) in society, how the views of these individuals are measured, and how the measurements are aggregated. Such prescriptions are necessary to choose from among the many possible descriptions of how society discounts. The descriptions are the measurements made given a choice of measurement technique. Thus, the labels 'descriptive approach' and 'prescriptive approach' are deeply misleading, as analysts cannot avoid imposing their own views on society. (author)

Converting Taxonomic Descriptions to New Digital Formats

Directory of Open Access Journals (Sweden)

Hong Cui

2008-01-01

Full Text Available Abstract.--The majority of taxonomic descriptions is currently in print format. The majority of digital descriptions are in formats such as DOC, HTML, or PDF and for human readers. These formats do not convey rich semantics in taxonomic descriptions for computer-aided process. Newer digital formats such as XML and RDF accommodate semantic annotations that allow computers to process the rich semantics on human's behalf, thus open up opportunities for a wide range of innovative usages of taxonomic descriptions, such as searching in more precise and flexible ways, integrating with gnomic and geographic information, generating taxonomic keys automatically, and text data mining and information visualization etc. This paper discusses the challenges in automated conversion of multiple collections of descriptions to XML format and reports an automated system, MARTT. MARTT is a machine-learning system that makes use of training examples to tag new descriptions into XML format. A number of utilities are implemented as solutions to the challenges. The utilities are used to reduce the effort for training example preparation, to facilitate the creation of a comprehensive schema, and to predict system performance on a new collection of descriptions. The system has been tested with several plant and alga taxonomic publications including Flora of China and Flora of North America.

Part I. Inviscid, swirling flows and vortex breakdown. Part II. A numerical investigation of the Lundgren turbulence model

International Nuclear Information System (INIS)

Buntine, J.D.

1994-01-01

Part I. A study of the behaviour of an inviscid, swirling fluid is performed. This flow can be described by the Squire-Long equation if the constraints of time-independence and axisymmetry are invoked. The particular case of flow through a diverging pipe is selected and a study is conducted to determine over what range of parameters does a solution exist. The work is performed with a view to understanding how the phenomenon of vortex breakdown develops. Experiments and previous numerical studies have indicated that the flow is sensitive to boundary conditions particularly at the pipe inlet. A open-quotes quasi-cylindricalclose quotes amplification of the Squire-Long equation is compared with the more complete model and shown to be able to account for most of its behaviour. An advantage of this latter representation is the relatively undetailed description of the flow geometry it requires in order to calculate a solution. open-quotes Criticalityclose quotes or the ability of small disturbances to propagate upstream is related to results of the quasi-cylindrical and axisymmetric flow models. This leads to an examination of claims made by researchers such as Benjamin and Hall concerning the interrelationship between open-quotes failureclose quotes of the quasi-cylindrical model and the occurrence of a open-quotes criticalclose quotes flow state. Lundgren developed an analytical model for homogeneous turbulence based on a collection of contracting spiral vortices each embedded in an axisymmetric strain field. Using asymptotic approximations he was able to deduce the Kolmogorov k -5/3 behaviour for inertial scales in the turbulence energy spectrum. Pullin ampersand Saffman have enlarged upon his work to make a number of predictions about the behaviour of turbulence described by the model. This work investigates the model numerically. The first part considers how the flow description compares with numerical simulations using the Navier-Stokes equations

Reinforced concrete structures loaded by snow avalanches : numerical and experimental approaches.

Science.gov (United States)

Ousset, I.; Bertrand, D.; Brun, M.; Limam, A.; Naaim, M.

2012-04-01

Today, due to the extension of occupied areas in mountainous regions, new strategies for risk mitigation have to be developed. In the framework of risk analysis, these latter have to take into account not only the natural hazard description but also the physical vulnerability of the exposed structures. From a civil engineering point of view, the dynamic behavior of column or portico was widely investigated especially in the case of reinforced concrete and steel. However, it is not the case of reinforced concrete walls for which only the in-plan dynamic behavior (shear behavior) has been studied in detail in the field of earthquake engineering. Therefore, the aim of this project is to study the behavior of reinforced concrete civil engineering structures submitted to out-of-plan dynamic loadings coming from snow avalanche interaction. Numerical simulations in 2D or 3D by the finite element method (FEM) are presented. The approach allows solving mechanical problems in dynamic condition involving none linearities (especially none linear materials). Thus, the structure mechanical response can be explored in controlled conditions. First, a reinforced concrete wall with a L-like shape is considered. The structure is supposed to represent a French defense structure dedicated to protect people against snow avalanches. Experimental pushover tests have been performed on a physical model. The experimental tests consisted to apply a uniform distribution of pressure until the total collapse of the wall. A 2D numerical model has been developed to simulate the mechanical response of the structure under quasi-static loading. Numerical simulations have been compared to experimental datas and results gave a better understanding of the failure mode of the wall. Moreover, the influence of several parameters (geometry and the mechanical properties) is also presented. Secondly, punching shear experimental tests have also been carried out. Reinforced concrete slabs simply supported have

Combined numerical and experimental determination of the convective heat transfer coefficient between an AlCrN-coated Vanadis 4 tool and Rhenus oil

DEFF Research Database (Denmark)

Üstünyagiz, Esmeray; Nielsen, Chris V.; Tiedje, Niels S.

2018-01-01

Abstract Regardless of the field of application, the reliability of numerical simulations depends on correct description of boundary conditions. In thermal simulation, determination of heat transfer coefficients is important because it varies with material properties and process conditions....... This paper shows a combined experimental and numerical analysis applied for determination of the heat transfer coefficient between an AlCrN-coated Vanadis 4 tool and Rhenus LA722086 oil in an unloaded condition, i.e. without the tool being in contact with a workpiece. It is found that the heat transfer...... coefficient in unloaded conditions at 80°C oil temperature is 0.1 kW/(m2∙K) between the selected stamping tool and mineral oil. A sensitivity analysis of the numerical model was performed to verify the effects of mesh discretization, temperature measurement location and tool geometry. Among these parameters...

CRAC2 model description

International Nuclear Information System (INIS)

Ritchie, L.T.; Alpert, D.J.; Burke, R.P.; Johnson, J.D.; Ostmeyer, R.M.; Aldrich, D.C.; Blond, R.M.

1984-03-01

The CRAC2 computer code is a revised version of CRAC (Calculation of Reactor Accident Consequences) which was developed for the Reactor Safety Study. This document provides an overview of the CRAC2 code and a description of each of the models used. Significant improvements incorporated into CRAC2 include an improved weather sequence sampling technique, a new evacuation model, and new output capabilities. In addition, refinements have been made to the atmospheric transport and deposition model. Details of the modeling differences between CRAC2 and CRAC are emphasized in the model descriptions

Olkiluoto site description 2011

International Nuclear Information System (INIS)

2012-12-01

This fourth version of the Olkiluoto Site Report, produced by the OMTF (Olkiluoto Modelling Task Force), updates the Olkiluoto Site Report 2008 with the data and knowledge obtained up to December 2010. A descriptive model of the site (the Site Descriptive Model, SDM), i.e. a model describing the geological and hydrogeological structure of the site, properties of the bedrock and the groundwater and its flow, and the associated interacting processes and mechanisms. The SDM is divided into six parts: surface system, geology, rock mechanics, hydrogeology, hydrogeochemistry and transport properties

Olkiluoto site description 2011

Energy Technology Data Exchange (ETDEWEB)

NONE

2012-12-15

This fourth version of the Olkiluoto Site Report, produced by the OMTF (Olkiluoto Modelling Task Force), updates the Olkiluoto Site Report 2008 with the data and knowledge obtained up to December 2010. A descriptive model of the site (the Site Descriptive Model, SDM), i.e. a model describing the geological and hydrogeological structure of the site, properties of the bedrock and the groundwater and its flow, and the associated interacting processes and mechanisms. The SDM is divided into six parts: surface system, geology, rock mechanics, hydrogeology, hydrogeochemistry and transport properties.

Qualitative Descriptive Methods in Health Science Research.

Science.gov (United States)

Colorafi, Karen Jiggins; Evans, Bronwynne

2016-07-01

The purpose of this methodology paper is to describe an approach to qualitative design known as qualitative descriptive that is well suited to junior health sciences researchers because it can be used with a variety of theoretical approaches, sampling techniques, and data collection strategies. It is often difficult for junior qualitative researchers to pull together the tools and resources they need to embark on a high-quality qualitative research study and to manage the volumes of data they collect during qualitative studies. This paper seeks to pull together much needed resources and provide an overview of methods. A step-by-step guide to planning a qualitative descriptive study and analyzing the data is provided, utilizing exemplars from the authors' research. This paper presents steps to conducting a qualitative descriptive study under the following headings: describing the qualitative descriptive approach, designing a qualitative descriptive study, steps to data analysis, and ensuring rigor of findings. The qualitative descriptive approach results in a summary in everyday, factual language that facilitates understanding of a selected phenomenon across disciplines of health science researchers. © The Author(s) 2016.

Description in Literature and Other Media

Directory of Open Access Journals (Sweden)

Thomas Van Parys

2009-10-01

Full Text Available Book Review:
Description in Literature and Other Media
Werner Wolf & Walter Bernhart, eds., Description in Literature and Other Media. Amsterdam/New
York: Rodopi, 2007.
ISBN: 978-90-420-2310-9

The effects of radial oxygen loss on arsenic tolerance and uptake in rice and on its rhizosphere

International Nuclear Information System (INIS)

Mei, X.Q.; Wong, M.H.; Yang, Y.; Dong, H.Y.; Qiu, R.L.; Ye, Z.H.

2012-01-01

Understanding the complex biotic and abiotic interactions invoked by the rice root system in oxygen-depleted soil is an important step in screening genotypes for low toxic metal or metalloid accumulation. A hydroponic and a rhizobox experiment have been conducted to explore the effects of varying root oxygen release on chemical changes, As fractionation in rhizosphere soil and Fe plaque formation, As uptake and tolerance by different rice genotypes. The results showed that rice genotypes with higher rates of radial oxygen loss (ROL) and at the bolting stage, tended to have greater effects on rhizosphere Eh, pH, Fe 3+ /Fe 2+ quotients, As fractionation and mobility and also on Fe plaque formation compared to those with lower ROL and at the tillering stage. Genotypes with higher ROL have a strong ability to reduce As accumulation in shoots and increase As tolerance by reducing As mobilization in the rhizosphere and by limiting As translocation. - Highlights: ► We investigate the effects of ROL on As tolerance, uptake, and changes in rhizosphere of rice genotypes and their correlation. ► Indices of As tolerance of genotypes are positively correlated with their rates of ROL. ► Genotypes with higher rates of ROL have greater effects on rhizosphere. ► Genotypes with higher rates of ROL have a strong ability to reduce As uptake by immobilizing As on roots and in rhizosphere. - Rice genotypes with high ROL and at the bolting stage have greater effects on their rhizosphere than others with lower ROL and at tillering stage and also have lower shoot As and higher As tolerance.

An object model for beamline descriptions

International Nuclear Information System (INIS)

Hill, B.W.; Martono, H.; Gillespie, J.S.

1997-01-01

Translation of beamline model descriptions between different accelerator codes presents a unique challenge due to the different representations used for various elements and subsystems. These differences range from simple units conversions to more complex translations involving multiple beamline components. A representation of basic accelerator components is being developed in order to define a meta-structure from which beamline models, in different codes, can be described and to facilitate the translation of models between these codes. Sublines of basic components will be used to represent more complex beamline descriptions and bridge the gap between codes which may represent a beamline element as a single entity, and those which use multiple elements to describe the same physical device. A C++ object model for supporting this beamline description and a grammar for describing beamlines in terms of these components is being developed. The object model will support a common graphic user interface and translation filters for representing native beamline descriptions for a variety of accelerator codes. An overview of our work on the object model for beamline descriptions is presented here. copyright 1997 American Institute of Physics

INTERDISCIPLINARIETY IN HIGHER EDUCATION: A GUIDE PROPOSAL FOR ROLE PLAY DESIGN LA INTERDISCIPLINARIEDAD EN LA EDUCACIÓN SUPERIOR: PROPUESTA DE UNA GUÍA PARA EL DISEÑO DE JUEGOS DE ROL

Directory of Open Access Journals (Sweden)

Deborah García Magna

2011-04-01

Full Text Available The aim of this article is to establish a teaching methodology that is integrated into the requests and necessities of the European Higher Education Area (EHEA, in which the undergraduate student must acquire all the professional competences guaranteeing the employability after his/her studies. We propose an interdisciplinary role play model based on the participation and collaboration among university teachers from different knowledge fields as well as undergraduate students from a great variety of the new Bachelor degrees. This model offers the teacher a useful guide for the design and the development of role play activities, whose aim is the acquisition and the implementation of general and specific competences of the new curricula. The use of an active methodology in our classrooms implies  the dinamization of the face to face teaching, since the game is the perfect element inviting the participation and motivation of the student. Thus, we fulfill one of our main objectives, that is, teaching the student to learn how to learn through the simulation of quasireal situations in the academic context.Con este artículo pretendemos configurar una metodología docente que se integra en las demandas y necesidades del Espacio Europeo de Educación Superior (EEES, en el que el alumno debe adquirir competencias profesionales que le garanticen la empleabilidad tras la finalización de sus estudios. Se propone un modelo de juego de rol de carácter interdisciplinar basado en la participación y colaboración de profesores de diferentes áreas de conocimiento y de alumnos de distintos títulos de grado. Este modelo ofrece al docente una guía que facilita el diseño y desarrollo de juegos de rol, cuyo objetivo es la adquisición y puesta en práctica de competencias genéricas y específicas de los nuevos planes de estudio involucrados. El uso de una metodología activa en nuestras aulas implica la dinamización de la docencia presencial -porque el juego

DOE-RL Integrated Safety Management System Description

International Nuclear Information System (INIS)

SHOOP, D.S.

2000-01-01

The purpose of this Integrated Safety Management System Description (ISMSD) is to describe the U.S. Department of Energy (DOE), Richland Operations Office (RL) ISMS as implemented through the RL Integrated Management System (RIMS). This ISMSD does not impose additional requirements but rather provides an overview describing how various parts of the ISMS fit together. Specific requirements for each of the core functions and guiding principles are established in other implementing processes, procedures, and program descriptions that comprise RIMS. RL is organized to conduct work through operating contracts; therefore, it is extremely difficult to provide an adequate ISMS description that only addresses RL functions. Of necessity, this ISMSD contains some information on contractor processes and procedures which then require RL approval or oversight. This ISMSD does not purport to contain a full description of the contractors' ISM System Descriptions

DOE-RL Integrated Safety Management System Description

CERN Document Server

Shoop, D S

2000-01-01

The purpose of this Integrated Safety Management System Description (ISMSD) is to describe the U.S. Department of Energy (DOE), Richland Operations Office (RL) ISMS as implemented through the RL Integrated Management System (RIMS). This ISMSD does not impose additional requirements but rather provides an overview describing how various parts of the ISMS fit together. Specific requirements for each of the core functions and guiding principles are established in other implementing processes, procedures, and program descriptions that comprise RIMS. RL is organized to conduct work through operating contracts; therefore, it is extremely difficult to provide an adequate ISMS description that only addresses RL functions. Of necessity, this ISMSD contains some information on contractor processes and procedures which then require RL approval or oversight. This ISMSD does not purport to contain a full description of the contractors' ISM System Descriptions.

Application of coupled symbolic and numeric processing to an advanced scheduling system for plant construction

International Nuclear Information System (INIS)

Kobayashi, Yasuhiro; Takamoto, Masanori; Nonaka, Hisanori; Yamada, Naoyuki

1994-01-01

A scheduling system has been developed by integrating symbolic processing functions for constraint handling and modification guidance, with numeric processing functions for schedule optimization and evaluation. The system is composed of an automatic schedule generation module, interactive schedule revision module and schedule evaluation module. The goal of the problem solving is the flattening of the daily resources requirement throughout the scheduling period. The automatic schedule generation module optimizes the initial schedule according to the formulatable portion of requirement description specified in a predicate-like language. A planning engineer refines the near-goal schedule through a knowledge-based interactive optimization process to obtain the goal schedule which fully covers the requirement description, with the interactive schedule revision module and schedule evaluation module. A scheduling system has been implemented on the basis of the proposed problem solving framework and experimentally applied to real-world sized scheduling problems for plant construction. With a result of the overall plant construction scheduling, a section schedule optimization process is described with the emphasis on the symbolic processing functions. (author)

Management control system description

Energy Technology Data Exchange (ETDEWEB)

Bence, P. J.

1990-10-01

This Management Control System (MCS) description describes the processes used to manage the cost and schedule of work performed by Westinghouse Hanford Company (Westinghouse Hanford) for the US Department of Energy, Richland Operations Office (DOE-RL), Richland, Washington. Westinghouse Hanford will maintain and use formal cost and schedule management control systems, as presented in this document, in performing work for the DOE-RL. This MCS description is a controlled document and will be modified or updated as required. This document must be approved by the DOE-RL; thereafter, any significant change will require DOE-RL concurrence. Westinghouse Hanford is the DOE-RL operations and engineering contractor at the Hanford Site. Activities associated with this contract (DE-AC06-87RL10930) include operating existing plant facilities, managing defined projects and programs, and planning future enhancements. This document is designed to comply with Section I-13 of the contract by providing a description of Westinghouse Hanford's cost and schedule control systems used in managing the above activities. 5 refs., 22 figs., 1 tab.

Numeral Incorporation in Japanese Sign Language

Science.gov (United States)

Ktejik, Mish

2013-01-01

This article explores the morphological process of numeral incorporation in Japanese Sign Language. Numeral incorporation is defined and the available research on numeral incorporation in signed language is discussed. The numeral signs in Japanese Sign Language are then introduced and followed by an explanation of the numeral morphemes which are…

Testing the methodology for site descriptive modelling. Application for the Laxemar area

Energy Technology Data Exchange (ETDEWEB)

Andersson, Johan [JA Streamflow AB, Aelvsjoe (Sweden); Berglund, Johan [SwedPower AB, Stockholm (Sweden); Follin, Sven [SF Geologic AB, Stockholm (Sweden); Hakami, Eva [Itasca Geomekanik AB, Stockholm (Sweden); Halvarson, Jan [Swedish Nuclear Fuel and Waste Management Co, Stockholm (Sweden); Hermanson, Jan [Golder Associates AB, Stockholm (Sweden); Laaksoharju, Marcus [Geopoint (Sweden); Rhen, Ingvar [Sweco VBB/VIAK, Stockholm (Sweden); Wahlgren, C.H. [Sveriges Geologiska Undersoekning, Uppsala (Sweden)

2002-08-01

and after this compared to check for potential inconsistencies. The processed data are used for three-dimensional modelling. The geological modelling provides the geometrical framework for the modelling in other disciplines and results in descriptions of geometry and properties of deformation zones of sizes down to 'local major zones' Q-10 km) and geometry and properties of rock domains. Two descriptions have been derived; the Base Geological Model and the Alternative Geological Model. Given the limited amount of data, regions of the model domain still have quite uncertain descriptions. The geometry is represented using a 3D CAD software (RVS), which is also used as an active interpretation tool for the geometric modelling. The base for the hydrogeological modelling is the Geological Model with its identified volumetric objects. Essential hydrogeological evaluation tools include: assessment of single hole hydraulic tests, interpretation of interference tests and numerical modelling of groundwater flow tests and other observations. The resulting hydrogeological description comprises hydraulic properties for defined geometrical units and boundary conditions for the present day conditions for the rock volume defined by the Base Geological Model. The major tasks for the hydrogeochemical evaluation include: (i) characterisation of undisturbed groundwater chemistry including the origin, depth/lateral distribution and the turnover time; (ii) focusing on data of importance for the safety evaluation such as pH, Eh, chloride, sulphide, colloids and microbes; (iii) identification of possible dissolved oxygen at repository depth. The hydrogeochemical description concerns distribution of the major water types, the water type mixing proportions and lists the major type of chemical reactions occurring at the site. Even if much of the modelling can be done in parallel with other disciplines, consistency checks with hydrogeology can and have been made. These comparisons

Cadmium accumulation in and tolerance of rice (Oryza sativa L.) varieties with different rates of radial oxygen loss

International Nuclear Information System (INIS)

Wang, M.Y.; Chen, A.K.; Wong, M.H.; Qiu, R.L.; Cheng, H.; Ye, Z.H.

2011-01-01

Cadmium (Cd) uptake and tolerance were investigated among 20 rice cultivars based on a field experiment (1.2 mg Cd kg -1 in soil) and a soil pot trial (control, 100 mg Cd kg -1 ), and rates of radial oxygen loss (ROL) were measured under a deoxygenated solution. Significant differences were found among the cultivars in: (1) brown rice Cd concentrations (0.11-0.29 mg kg -1 ) in a field soil, (2) grain Cd tolerance (34-113%) and concentrations (2.1-6.5 mg kg -1 ) in a pot trial, and (3) rates of ROL (15-31 mmol O 2 kg -1 root d.w. h -1 ). Target hazard quotients were calculated for the field experiment to assess potential Cd risk. Significant negative relationships were found between rates of ROL and concentrations of Cd in brown rice or straw under field and greenhouse conditions, indicating that rice cultivars with higher rates of ROL had higher capacities for limiting the transfer of Cd to rice and straw. - Highlights: → There are significant differences in brown rice Cd concentrations and rates of ROL among the rice cultivars. → The rates of ROL are significantly correlated with concentrations of Cd in brown rice. → Rice cultivars with higher rates of ROL have higher capacities for limiting the transfer of Cd to rice and straw. - Rice cultivars with high rates of ROL tended to accumulate low Cd in grains.

Numerical study of the axisymmetric ideal MHD stability of Extrap

International Nuclear Information System (INIS)

Benda, M.

1993-04-01

A numerical study of the free-boundary axisymmetric (n=0) ideal magnetohydrodynamical (MHD) motions of the Extrap device is presented. The dependence of stability on current profiles in the plasma and currents in the external conductors is investigated. Results are shown for linear growth-rates and nonlinear saturation amplitudes and their dependence on plasma radius as well as on the conducting shell radius. A method combined of two different algorithms has been developed and tested. The interior region of the plasma is simulated by means of a Lagrangian Finite Element Method (FEM) for ideal magnetohydrodynamics, The method is based on a nonlinear radiation principle for the Lagrangian description of ideal MHD. The Boundary Element Method (BEM) is used together with the Lagrangian FEM to simulate nonlinear motion of an ideal MHD plasma behaviour in a vacuum region under the influence of external magnetic fields. 31 refs

A conservative numerical scheme for modeling nonlinear acoustic propagation in thermoviscous homogeneous media

Science.gov (United States)

Diaz, Manuel A.; Solovchuk, Maxim A.; Sheu, Tony W. H.

2018-06-01

A nonlinear system of partial differential equations capable of describing the nonlinear propagation and attenuation of finite amplitude perturbations in thermoviscous media is presented. This system constitutes a full nonlinear wave model that has been formulated in the conservation form. Initially, this model is investigated analytically in the inviscid limit where it has been found that the resulting flux function fulfills the Lax-Wendroff theorem, and the scheme can match the solutions of the Westervelt and Burgers equations numerically. Here, high-order numerical descriptions of strongly nonlinear wave propagations become of great interest. For that matter we consider finite difference formulations of the weighted essentially non-oscillatory (WENO) schemes associated with explicit strong stability preserving Runge-Kutta (SSP-RK) time integration methods. Although this strategy is known to be computationally demanding, it is found to be effective when implemented to be solved in graphical processing units (GPUs). As we consider wave propagations in unbounded domains, perfectly matching layers (PML) have been also considered in this work. The proposed system model is validated and illustrated by using one- and two-dimensional benchmark test cases proposed in the literature for nonlinear acoustic propagation in homogeneous thermoviscous media.

Characteristic extraction in numerical relativity: binary black hole merger waveforms at null infinity

Energy Technology Data Exchange (ETDEWEB)

Reisswig, C; Pollney, D [Max-Planck-Institut fuer Gravitationsphysik, Albert-Einstein-Institut, 14476 Golm (Germany); Bishop, N T [Department of Mathematics, Rhodes University, Grahamstown 6140 (South Africa); Szilagyi, B [Theoretical Astrophysics, California Institute of Technology, Pasadena, CA 91125 (United States)

2010-04-07

The accurate modeling of gravitational radiation is a key issue for gravitational wave astronomy. As simulation codes reach higher accuracy, systematic errors inherent in current numerical relativity wave extraction methods become evident, and may lead to a wrong astrophysical interpretation of the data. In this paper, we give a detailed description of the Cauchy-characteristic extraction technique applied to binary black hole inspiral and merger evolutions to obtain gravitational waveforms that are defined unambiguously, that is, at future null infinity. By this method, we remove finite-radius approximations and the need to extrapolate data from the near zone. Further, we demonstrate that the method is free of gauge effects and thus is affected only by numerical error. Various consistency checks reveal that energy and angular momentum are conserved to high precision and agree very well with extrapolated data. In addition, we revisit the computation of the gravitational recoil and find that finite-radius extrapolation very well approximates the result at J{sup +}. However, the (non-convergent) systematic differences in the extrapolated data are of the same order of magnitude as the (convergent) discretization error of the Cauchy evolution, thus highlighting the need for correct wave extraction.

Testing the methodology for site descriptive modelling. Application for the Laxemar area

International Nuclear Information System (INIS)

Andersson, Johan; Berglund, Johan; Follin, Sven; Hakami, Eva; Halvarson, Jan; Hermanson, Jan; Laaksoharju, Marcus; Rhen, Ingvar; Wahlgren, C.H.

2002-08-01

compared to check for potential inconsistencies. The processed data are used for three-dimensional modelling. The geological modelling provides the geometrical framework for the modelling in other disciplines and results in descriptions of geometry and properties of deformation zones of sizes down to 'local major zones' Q-10 km) and geometry and properties of rock domains. Two descriptions have been derived; the Base Geological Model and the Alternative Geological Model. Given the limited amount of data, regions of the model domain still have quite uncertain descriptions. The geometry is represented using a 3D CAD software (RVS), which is also used as an active interpretation tool for the geometric modelling. The base for the hydrogeological modelling is the Geological Model with its identified volumetric objects. Essential hydrogeological evaluation tools include: assessment of single hole hydraulic tests, interpretation of interference tests and numerical modelling of groundwater flow tests and other observations. The resulting hydrogeological description comprises hydraulic properties for defined geometrical units and boundary conditions for the present day conditions for the rock volume defined by the Base Geological Model. The major tasks for the hydrogeochemical evaluation include: (i) characterisation of undisturbed groundwater chemistry including the origin, depth/lateral distribution and the turnover time; (ii) focusing on data of importance for the safety evaluation such as pH, Eh, chloride, sulphide, colloids and microbes; (iii) identification of possible dissolved oxygen at repository depth. The hydrogeochemical description concerns distribution of the major water types, the water type mixing proportions and lists the major type of chemical reactions occurring at the site. Even if much of the modelling can be done in parallel with other disciplines, consistency checks with hydrogeology can and have been made. These comparisons enhance the confidence in the

Time domain numerical calculations of the short electron bunch wakefields in resistive structures

Energy Technology Data Exchange (ETDEWEB)

Tsakanian, Andranik

2010-10-15

The acceleration of electron bunches with very small longitudinal and transverse phase space volume is one of the most actual challenges for the future International Linear Collider and high brightness X-Ray Free Electron Lasers. The exact knowledge on the wake fields generated by the ultra-short electron bunches during its interaction with surrounding structures is a very important issue to prevent the beam quality degradation and to optimize the facility performance. The high accuracy time domain numerical calculations play the decisive role in correct evaluation of the wake fields in advanced accelerators. The thesis is devoted to the development of a new longitudinally dispersion-free 3D hybrid numerical scheme in time domain for wake field calculation of ultra short bunches in structures with walls of finite conductivity. The basic approaches used in the thesis to solve the problem are the following. For materials with high but finite conductivity the model of the plane wave reflection from a conducting half-space is used. It is shown that in the conductive half-space the field components perpendicular to the interface can be neglected. The electric tangential component on the surface contributes to the tangential magnetic field in the lossless area just before the boundary layer. For high conducting media, the task is reduced to 1D electromagnetic problem in metal and the so-called 1D conducting line model can be applied instead of a full 3D space description. Further, a TE/TM (''transverse electric - transverse magnetic'') splitting implicit numerical scheme along with 1D conducting line model is applied to develop a new longitudinally dispersion-free hybrid numerical scheme in the time domain. The stability of the new hybrid numerical scheme in vacuum, conductor and bound cell is studied. The convergence of the new scheme is analyzed by comparison with the well-known analytical solutions. The wakefield calculations for a number of

Surgimiento, dinámica y rol de las plantineras en el aglomerado hortícola de La Plata

Directory of Open Access Journals (Sweden)

Matías García

2016-12-01

Full Text Available RESUMEN La caracterización de la actual dinámica del Cinturón Hortícola Platense tendría un mejor ajuste si se interpreta desde el enfoque de economías de aglomeración. Así, una actividad que se caracterizó históricamente por su producción atomizada y descentralizada, ahora muestra una concentración espacial y cercana articulación con los eslabones de aprovisionamiento de insumos y comercialización. El objetivo del trabajo es desarrollar la influencia y dependencia de un servicio existente en la zona hortícola platense: las plantineras. Se busca identificar las razones de su surgimiento, su evolución y actual importancia y dependencia. También describir su interrelación con las semilleras y agronomías. Finalmente, se caracteriza el rol de las plantineras en el aglomerado de empresas que conforma la horticultura platense. Se concluye que las plantineras pueden considerarse un caso de economía externa, causa y consecuencia a su vez del incremento de la competitividad en este espacio productivo. ABSTRACT The current dynamics of La Plata’s Horticultural Belt seem to fit better if interpreted from the agglomeration economies perspective. Thus, an activity historically characterized by its fragmented and decentralized production nowadays shows a spatial concentration and close coordination with the links in supply of inputs and marketing. The aim of this work is to develop the influence and dependence on an existing service in La Plata’s horticultural zone: the nursery garden. It seeks to identify the reasons for its emergence, evolution and current importance and dependence. Also to describe their interrelationships with seed companies and agrochemical shops. Finally, the nursery garden role in horticultural agglomerate of La Platais characterized. It is concluded that nursery garden could be considered a case of external economy, cause and consequence of increasing competitiveness in the productive space.

Waste Management System Description Document (WMSD)

International Nuclear Information System (INIS)

1992-02-01

This report is an appendix of the ''Waste Management Description Project, Revision 1''. This appendix is about the interim approach for the technical baseline of the waste management system. It describes the documentation and regulations of the waste management system requirements and description. (MB)

The transportation operations system: A description

International Nuclear Information System (INIS)

Best, R.E.; Danese, F.L.; Dixon, L.D.; Peterson, R.W.; Pope, R.B.

1990-01-01

This paper presents a description of the system for transporting radioactive waste that may be deployed to accomplish the assigned system mission, which includes accepting spent nuclear fuel (SNF) and high-level radioactive waste (HLW) from waste generator sites and transporting them to the FWMS destination facilities. The system description presented here contains, in part, irradiated fuel and waste casks, ancillary equipments, truck, rail, and barge transporters, cask and vehicle traffic management organizations, maintenance facilities, and other operations elements. The description is for a fully implemented system, which is not expected to be achieved, however, until several years after initial operations. 6 figs

Cisteínoproteasas Catepsinas L de Taenia solium: Rol biológico en la infección y potencial uso para el inmunodiagnóstico de la neurocisticercosis

Directory of Open Access Journals (Sweden)

Nancy León

2013-09-01

Full Text Available Taenia solium es un helminto aplanado responsable de la teniosis y de la cisticercosis humana, siendo esta última producida por el consumo de huevos infectivos. Los cisticercos pueden desarrollarse en diferentes tejidos del hombre, frecuentemente en el sistema nervioso central causando la neurocisticercosis (NCC. Para el diagnóstico de la NCC se requiere de una adecuada interpretación de datos clínicos, resultados de neuroimagen y pruebas serológicas. Sin embargo, las pruebas serológicas podrían mejorarse con el desarrollo de antígenos candidatos capaces de incrementar su sensibilidad y especificidad. En los últimos años se han descrito una serie de proteínas de superficie y de secreción de T. solium esenciales para la interacción parásito-hospedero. Una de estas familias son las cisteínoproteasas catepsinas L, las cuales cumplen un rol preponderante para el desarrollo y supervivencia del parásito, participando en la invasión tisular, la evasión de la respuesta inmune, el desenquistamiento y enquistamiento del cisticerco. Son consideradas como antígenos potenciales para el inmunodiagnóstico de la neurocisticercosis.