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Sample records for regime tributario aplicado

  1. Constitutional issues of Brazilian tax system in the biodiesel industry; Aspectos constitucionais do regime tributario aplicado a industria brasileira do biodiesel

    Energy Technology Data Exchange (ETDEWEB)

    Ferreira, Ana Monica Medeiros; Xavier, Yanko Marcius de Alencar [Universidade Federal do Rio Grande do Norte (UFRN), Natal, RN (Brazil)

    2008-07-01

    The recent insertion of biodiesel derived from oily vegetables in the Brazilian genetic matrix calls for the analysis of some aspects that belong to it. This study begins with an introduction to 'sustainable development' definition, it goes through the concept of biodiesel and a brief historical, the paper analyzes it's advantages - social, economic and environmental - related to the fossil fuels predominantly used. With the purpose to look into the 'Programa Nacional de Producao e Uso de Biodiesel - PNPB' created by the Federal Government in 2004, this study searches about the Brazilian regulating legislation on this subject, fundamental for the comprehension of the plans and objectives sought by the Brazilian Government with the encouragement to the production of the biodiesel. This study also investigates the role of the 'Agencia Nacional do Petroleo, Gas Natural e Biocombustiveis - ANP' in the regulation of the activities involving this biofuel. In this manner, from the analysis of the related legislation of this new energy source, the present article aims to delineate a view of the the tax system for this new market according to Constitution and pointing out the economic impacts of the biodiesel insertion in the Brazilian national energetic matrix. (author)

  2. Constitutional issues of Brazilian tax system in the biodiesel industry; Aspectos constitucionais do regime tributario aplicado a industria brasileira do biodiesel

    Energy Technology Data Exchange (ETDEWEB)

    Ferreira, Ana Monica Medeiros; Xavier, Yanko Marcius de Alencar [Universidade Federal do Rio Grande do Norte (UFRN), Natal, RN (Brazil)

    2008-07-01

    The recent insertion of biodiesel derived from oily vegetables in the Brazilian genetic matrix calls for the analysis of some aspects that belong to it. This study begins with an introduction to 'sustainable development' definition, it goes through the concept of biodiesel and a brief historical, the paper analyzes it's advantages - social, economic and environmental - related to the fossil fuels predominantly used. With the purpose to look into the 'Programa Nacional de Producao e Uso de Biodiesel - PNPB' created by the Federal Government in 2004, this study searches about the Brazilian regulating legislation on this subject, fundamental for the comprehension of the plans and objectives sought by the Brazilian Government with the encouragement to the production of the biodiesel. This study also investigates the role of the 'Agencia Nacional do Petroleo, Gas Natural e Biocombustiveis - ANP' in the regulation of the activities involving this biofuel. In this manner, from the analysis of the related legislation of this new energy source, the present article aims to delineate a view of the the tax system for this new market according to Constitution and pointing out the economic impacts of the biodiesel insertion in the Brazilian national energetic matrix. (author)

  3. APLICACION DEL DERECHO TRIBUTARIO EN MATERIA ADUANERA

    OpenAIRE

    Cosio Jara, Fernando

    2014-01-01

    El Derecho Tributario es el conjunto de normas que regulan el tributo. entendido como una fuente de recursos públicos destinados a financiar los gastos que cubrirán el costo de los servicios necesarios para satisfacer las necesidades públicas. Es una de las funciones principales de Aduana, no la única, la recaudación del tributo aduanero (no olvidemos su función de control relacionada con medidas de orden público, sanidad, defensa del consumidor y del patrimonio cultural). El Derecho Adua...

  4. Análisis Costo-Beneficio del Programa de Gas Natural Vehicular aplicado en el Área Metropolitana del Valle de Aburrá

    OpenAIRE

    Saldarriaga Isaza Carlos Adrián; Vásquez Sánchez Edison; Chavarría Múnera Sergio

    2011-01-01

    Este texto presenta el resultado de la evaluación al Programa de Gas Natural Vehicular aplicado en el Área Metropolitana del Valle de Aburrá, mediante el método Análisis Costo- Benefi cio. Tras identificar y valorar económicamente cuatro costos: Privado, Ecodescuento, Tributario del Combustible y Tributario de la Conversión, y tres benefi cios: Privado, Fiscal y Externo, de los cuales el beneficio externo que representa el componente ambiental, requirió aplicar el método de transferencia...

  5. Tratamiento tributario del factoring en el Perú

    OpenAIRE

    Rocío Liu Arévalo; Eduardo Sotelo Castañeda

    2015-01-01

    Una de las alternativas de financiamiento que tienen las empresas a su alcance es la que se presenta a través del contrato de factoring. En virtud de dicho contrato una de las partes - factor- adquiere todos o una parte de los créditos que la otra parte - factorado - tiene frente a terceros, adelantándole a cambio el importe de los mismos. En el presente artículo, los autores describen y analizan el régimen tributario aplicable al contrato de factoring en el Perú, p...

  6. Tratamiento Tributario en las Operaciones con Créditos de Carbono en Empresas Brasileñas con Proyectos MDL

    Directory of Open Access Journals (Sweden)

    Vanderlei dos Santos

    2012-01-01

    Full Text Available El estudio objetiva identificar el tratamiento tributario aplicado en las operaciones con créditos de carbono en empresas brasileñas que están desarrollando proyectos en el ámbito del Mecanismo de Desarrollo Limpio (MDL. Para tal, se realizó una pesquisa exploratoria, con abordaje cualitativo de los datos, colectados por medio de cuestionario enviado a todas las empresas brasileñas que poseen proyectos de MDL aprobados sin excepciones por la Comisión Interministerial de Mudanza Global del Clima (CIMGC, conforme listado del Ministerio de la Ciencia y Tecnología. De las 117 empresas listadas, solamente cinco respondieron el instrumento de pesquisa, constituyendo así, una muestra por accesibilidad. Los resultados muestran que en relación al tratamiento tributario aplicado en las empresas investigadas, debe haber tributación del IRPJ y CSLL en las operaciones con créditos de carbono. Referente a la incidencia de PIS, COFINS, ISS, hay empresas que entienden que estos tributos inciden y otras son de opinión que no hay incidencia. No obstante, se constató que hay uniformidad sobre el entendimiento de la no incidencia de ICMS e IOF. Se concluyó que todavía no hay uniformidad de entendimiento sobre la tributación que corresponda en las empresas pesquisadas, lo que se justifica por todavía no haber legislaciones tributarias específicas sobre créditos de carbono en el Brasil.

  7. Análisis Costo-Beneficio del Programa de Gas Natural Vehicular aplicado en el Área Metropolitana del Valle de Aburrá

    Directory of Open Access Journals (Sweden)

    Saldarriaga Isaza Carlos Adrián

    2011-11-01

    Full Text Available Este texto presenta el resultado de la evaluación al Programa de Gas Natural Vehicular aplicado en el Área Metropolitana del Valle de Aburrá, mediante el método Análisis Costo- Benefi cio. Tras identificar y valorar económicamente cuatro costos: Privado, Ecodescuento, Tributario del Combustible y Tributario de la Conversión, y tres benefi cios: Privado, Fiscal y Externo, de los cuales el beneficio externo que representa el componente ambiental, requirió aplicar el método de transferencia de beneficios en su modalidad meta-análisis, el balance neto resulta ser positivo y favorable a la aplicación del programa. La suma agregada para un periodo de ocho años (2001-2008 en términos reales se acerca a los 803265 millones de pesos.

  8. Efectos del principio de no confiscatoriedad en el régimen tributario ecuatoriano

    OpenAIRE

    Ordóñez Santacruz, Pedro Bolívar

    2012-01-01

    En el presente trabajo de investigación se ha hecho un esfuerzo por revalorizar el contenido del principio de No Confiscatoriedad, como un principio de carácter transcendental dentro del Régimen Tributario ecuatoriano, entendiéndolo a la vez como un derecho que tienen los contribuyentes y como una regla a respetarse por parte de los poderes del Estado, en particular del poder tributario. En tal virtud, el principio de No Confiscatoriedad tiene sus diferentes campos de aplica...

  9. COSTO DE CAPITAL E IMPUESTOSEN UN SISTEMA TRIBUTARIO NO INTEGRADO Y EN UNO INTEGRADO.Generalización del modelo

    Directory of Open Access Journals (Sweden)

    Jorge Niño T.

    2014-01-01

    Full Text Available En este artículo se determina expresiones para el beneficio tributario de endeudarse y para el rendimiento que exige un accionista, si la empresa y la deuda crecen, en un sistema tributario no integrado como el de los Estados Unidos. Luego se determina expresiones equivalentes para un sistema tributario totalmente integrado. La prin-cipal aportación de este artículo es la extensión y generalización de las fórmulas de valoración de empresas y de costo del patrimonio a un sistema tributario distinto del estadunidense, pero que prevalece en muchos otros países del mundo.

  10. La responsabilidad patrimonial del Estado legislador en el ámbito tributario

    OpenAIRE

    Pérez Bernabeu, Begoña

    2016-01-01

    La responsabilidad patrimonial del Estado es un instituto básico en un Estado de Derecho, extendiéndose a los tres poderes del Estado: Legislativo, ejecutivo y judicial. En la actualidad existe un elevado grado de consenso en nuestro país al afirmar que el reconocimiento constitucional de la responsabilidad patrimonial del Estado legislador reside en el apartado 3 del artículo 9 de nuestra Constitución. En el ámbito tributario este instituto reviste una especial importancia habida cuenta de l...

  11. La Devolución de lo indebido tributario en el derecho de la Comunidad Europea

    OpenAIRE

    Martínez-Carrasco Pignatelli, José Miguel

    2008-01-01

    Consultable des del TDX Títol obtingut de la portada digitalitzada El derecho de los ciudadanos de la Unión Europea a la devolución de los ingresos tributarios que indebidamente realizan a las administraciones nacionales surge como consecuencia de la percepción por los estados miembros de exacciones que resultan contrarias al ordenamiento jurídico comunitario. Sólo el procedimiento para el reconocimiento del derecho a la restitución de los ingresos aduaneros indebidos se encuentra regul...

  12. Concepción normológica de la problemática científica del derecho tributario internacional

    OpenAIRE

    Feuillade, Milton César

    2017-01-01

    El Derecho Tributario Internacional se encuentra dentro del horizonte jurídico del Derecho Internacional Privado. Puede hablarse de conflictos de normas en el Derecho Tributario Internacional y de la aplicación de las instituciones propias del Derecho Internacional Privado para su mejor solución. El Derecho extranjero tomado de forma sistémica requiere el tener en cuenta junto al Derecho Civil al Derecho Público, del cual el Derecho Tributario es parte, a efectos de hacer una correcta aplicac...

  13. A regulação do uso de animais no Brasil do século XX e o processo de formação do atual regime aplicado à pesquisa biomédica Regulation of the use of animals in Brazil in the twentieth century and the process of forming the current regime applied to biomedical research

    Directory of Open Access Journals (Sweden)

    Carlos José Saldanha Machado

    2010-03-01

    Full Text Available O artigo analisa a política pública e regulatória do Brasil sobre o uso de animais no ensino e na pesquisa biomédica. Aborda o arcabouço institucional-legal e a situação jurídica da proteção dos animais no país, além do debate legislativo que resultou na promulgação da lei 11.794/2008, que estabelece procedimentos para o uso científico de animais. Ressalta algumas características do atual regime regulatório e tece considerações de ordem teórico-metodológica, voltadas para a ampliação do entendimento do fenômeno investigado.The article analyzes Brazilian public policy and legislation concerning the use of animals in teaching and biomedical research. It examines the institutional and judicial framework and legal status of animal protection in Brazil, including the legislative debate that preceded enactment of Law 11.794/2008, which defined procedures to be employed in the scientific use of animals. It underscores certain features of current regulatory practice and also explores considerations of a theoretical and methodological nature, with a view to broadening our understanding of the question.

  14. Orientación del sistema tributario en el Ecuador a partir de la Ley Reformatoria para la Equidad Tributaria

    OpenAIRE

    Cevallos Vaca, María del Carmen

    2011-01-01

    El presente trabajo busca determinar la orientación que se ha dado al régimen o sistema tributario ecuatoriano, con fundamento, tanto en las tendencias internacionales sobre tributación, así como en relación a los principios de la tributación consagrados en la Constitución de la República del Ecuador. La investigación contenida en este trabajo se desarrolla en tres capítulos; el primero, a manera introductoria, se refiere a los aspectos generales de la tributación en el Ecua...

  15. SIG aplicado ao Ensino de Geografia

    OpenAIRE

    Dornelles, Liane Maria Azevedo; Universidade do Estado do Rio de Janeiro - UERJ

    2009-01-01

    Este trabalho descreve as atividades desenvolvidas junto à disciplina eletiva SIG aplicado ao ensino de Geografia. Foram elaboradas aplicações ambientais para os Ensinos Fundamental e Médio, com auxílio dos programas VistaSAGA/UFRJ, SISPLAMTE 5as com GIS, SPRING/INPE e MapServer.

  16. Efecto Impositivo y Tributario de la Reforma Contable. Especial Referencia a las Cuentas Anuales Consolidadas

    Directory of Open Access Journals (Sweden)

    Enrique Corona Romero

    2004-01-01

    Full Text Available El modelo contable español será un modelo dual como consecuencia de la aplicación de las normas internacionales de contabilidad adoptadas por la Unión Europea a ciertas cuentas anuales consolidadas. No obstante, el método del afecto impositivo de la NIC 12 es muy similar al regulado por las normas españolas, sin perjuicio de la necesidad de complementar éstas con una serie de precisiones y reglas adicionales en materia valorativa y de representación. El proceso de consolidación y las magnitudes consolidadas pueden modificarse (en determinadas cuentas consolidadas como consecuencia de la aplicación del indicado modelo dual. La modificación de las normas contables aplicables a las cuentas anuales individuales, utilizando el valor razonable y una nueva determinación de ingresos y gastos, puede tener incidencia tributaria, alterando el gravamen por Impuesto sobre Sociedades, salvo que se introduzcan nuevas normas fiscales que "compensen" los efectos que se producen en el vigente modelo de fijación de la base imponible. Las novedades que se introduzcan en las normas aplicables a las cuentas anuales consolidadas tendrían, en principio, un efecto tributario limitado. Palabras clave: método del efecto impositivo, normas internacionales de contabilidad, cuentas anuales consolidadas, Impuesto sobre Sociedades, diferencias temporales, diferencias temporarias, base fiscal. The Spanish accounting model will be dual as a result of the application to certain consolidated annual accounts of international accounting standards adopted by the European Union. However, the procedure for determining tax liability set forth in the IAS 12 is very similar to that regulated by Spanish standards, although these must be complemented by a series of specific provisions and additional rules on assessment and representation matters. The consolidation process and the consolidated amounts may be amended (for certain consolidated accounts as a result of the

  17. 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 ...

  18. La Reforma Tributaria pendiente en Costa Rica: Consideraciones para el diseño del Sistema Tributario

    Directory of Open Access Journals (Sweden)

    Luis Loría

    2009-06-01

    Full Text Available Desde los años 90s, se ha intensificado la discusión acerca de la necesidad de reformas tributarias de diversa índole en Costa Rica. A pesar de que algunas veces se han impulsado reformas ambiciosas, los resultados siempre han sido el fracaso o, en el mejor de los casos, cambios marginales (no necesariamente mejoras a impuestos existentes. A través del tiempo, se han esgrimido los más diversos argumentos para justificar las reformas, obedeciendo, en la mayoría de los casos, a problemas coyunturales y a prioridades de corto plazo del gobierno de turno. Como resultado, el sistema tributario vigente incorpora las cicatrices de experimentos fallidos e iniciativas parcialmente implementadas que se acumulan y se hacen evidentes en una serie de ineficiencias e injusticias. A continuación, identificaremos y analizaremos algunas de las principales ineficiencias e injusticias y discutiremos posibles alternativas para solucionarlas o reducirlas.

  19. "Análisis de la implementación del impuesto a la renta unico del sector bananero en el sistema tributario ecuatoriano como herramienta mas efectiva de recaudación camparada con sistemas tributarios y su admnistración en otros países"

    OpenAIRE

    Espol; Alvarado Zuñiga, Marlin Manuel

    2016-01-01

    El sector bananero es uno de los principales rubros de la economía nacional, debido a que el Ecuador es el primer exportador mundial de banano, por este motivo el presente estudio relevante, cuyo objetivo fue analizar las ventajas del impuesto único del sector bananero implementado en el sistema tributario ecuatoriano, para verificar su comportamiento recaudatorio durante el periodo 2008-2015, para establecer una comparación con dos países latinoamericanos (Guatemala y Costa Rica), realizando...

  20. Derecho tributario y defraudación fiscal: Un análisis psicosocial de la conducta de tributación.

    OpenAIRE

    Fernández Martín, Juan Rafael

    2016-01-01

    En este estudio se exponen los resultados de una serie de trabajos e investigaciones relacionados con la tributación y el fraude fiscal. A través de una amplia revisión de la literatura existente se examinan los modelos y estudios clásicos, así como los puntos de vista actuales sobre los determinantes psicosociales del comportamiento tributario. Los cambios demográficos, económicos y políticos de principios del siglo XXI han obligado a los Estados modernos a hacer un notable esfuerzo por m...

  1. Responsabilidad de los contadores públicos ante ilícitos tributarios en empresas comerciales del sector ferretero del Municipio Alberto Adriani del estado Mérida

    OpenAIRE

    Almeida, Jhoner; Cote, Marilys; Briceño, María Eugenia; Rojas, Ma. Elizabeth

    2011-01-01

    La actuación del contador público está cubierta de responsabilidad y compromiso y ante esto debe actuar con rectitud y buena fe, mantener el honor, dignidad y capacidad profesional. No obstante, hay situaciones en la que los contadores incurren en actos contrarios a la norma legal, lo cual puede provocar daños a terceros o al Estado. Tal es el caso de los ilícitos tributarios que constituyen toda acción u omisión violatoria de las normas tributarias previstas en el Código Orgánico...

  2. Impacto del reintegro tributario en los estados financieros de una empresa comercializadora de productos avícolas en el periodo 2007- 2009

    OpenAIRE

    Fernandez Ruíz, Sussann Lizbeth; Vásquez Del Águila, Juan Carlos

    2011-01-01

    El objetivo fue determinar el impacto del reintegro tributario en los estados financieros de la Empresa Comercializadora de productos avícolas "Don Pollo" de la ciudad de !quitos durante el periodo 2007-2009. La investigación fue documental, retrospectiva y de diseño descriptivo. La población estuvo constituida por el conjunto de estados financieros de la empresa comercializadora de productos avícolas "Don Pollo" y la muestra estuvo conformada por los estados financieros del periodo 2007-2009...

  3. Flow regimes

    International Nuclear Information System (INIS)

    Kh'yuitt, G.

    1980-01-01

    An introduction into the problem of two-phase flows is presented. Flow regimes arizing in two-phase flows are described, and classification of these regimes is given. Structures of vertical and horizontal two-phase flows and a method of their identification using regime maps are considered. The limits of this method application are discussed. The flooding phenomena and phenomena of direction change (flow reversal) of the flow and interrelation of these phenomena as well as transitions from slug regime to churn one and from churn one to annular one in vertical flows are described. Problems of phase transitions and equilibrium are discussed. Flow regimes in tubes where evaporating liquid is running, are described [ru

  4. Methods of statistical analysis, dimensioning and determination of production of electric power for description of the scheme applied to wind in Botucatu/ SP region, Brazil; Metodos de analise estatistica, dimensionamento e determinacao da energia eletrica produtivel para descricao do regime eolico aplicados na regiao de Botocatu-SP

    Energy Technology Data Exchange (ETDEWEB)

    Gabriel Filho, Luis Roberto Almeida [Universidade Estadual Paulista Julio de Mesquita Filho (FCA/UNESP), Botucatu, SP (Brazil). Fac. de Ciencias Agronomicas], email: gabrielfilho@tupa.unesp.br; Cremasco, Camila P. [Faculdade de Tecnologia (FATEC), Presidente Prudente, SP (Brazil); Universidade Estadual Paulista Julio de Mesquita Filho (UNESP), Botucatu, SP (Brazil). Dept. de Bioestatistica; Verri, Juliano A. [Universidade Estadual Paulista Julio de Mesquita Filho (FCT/UNESP), Presidente Prudente, SP (Brazil). Dept. de Matematica, Estatistica e Computacao; Viais Neto, Daniel dos S. [Faculdade de Tecnologia (FATEC), Presidente Prudente, SP (Brazil); Universidade Estadual Paulista Julio de Mesquita Filho (FCA/UNESP), Botucatu, SP (Brazil). Fac. de Ciencias Agronomicas; Seraphim, Odivaldo J. [Universidade Estadual Paulista Julio de Mesquita Filho (FCA/UNESP), Botucatu, SP (Brazil). Fac. de Ciencias Agronomicas. Dept. de Engenharia Rural

    2011-07-01

    The wind energy is an abundant source of renewable energy, clean and available almost everywhere. For its use, studies are needed to adequately describe its intensity for statistical methods and design for wind turbines. The objective is to structure the mathematical methods used to conduct a general description of the wind, to establish a description of the wind regime using the parameters described using the Weibull function and the analytical model of power from a wind turbine, as well as applications of these methods show. This work was developed at Rural Empowerment Lab of FCA/UNESP in Botucatu-SP. For the application of methods were utilized measurements of wind speed and direction, between 2004 and 2005, obtained by anemometer RM Young Wind Monitor-Campbell. As a result, they estimated the wind behavior and distribution of wind in the region, with 78 kWh of energy production, relatively low potential to supply a small house. Moreover, this energy could possibly be applied in ambient illumination, power supply for electric fences and irrigation of vegetables. (author)

  5. Flow regimes

    International Nuclear Information System (INIS)

    Liles, D.R.

    1982-01-01

    Internal boundaries in multiphase flow greatly complicate fluid-dynamic and heat-transfer descriptions. Different flow regimes or topological configurations can have radically dissimilar interfacial and wall mass, momentum, and energy exchanges. To model the flow dynamics properly requires estimates of these rates. In this paper the common flow regimes for gas-liquid systems are defined and the techniques used to estimate the extent of a particular regime are described. Also, the current computer-code procedures are delineated and introduce a potentially better method is introduced

  6. Regime change?

    International Nuclear Information System (INIS)

    Pilat, Joseph F.; Budlong-Sylvester, K.W.

    2004-01-01

    Following the 1998 nuclear tests in South Asia and later reinforced by revelations about North Korean and Iraqi nuclear activities, there has been growing concern about increasing proliferation dangers. At the same time, the prospects of radiological/nuclear terrorism are seen to be rising - since 9/11, concern over a proliferation/terrorism nexus has never been higher. In the face of this growing danger, there are urgent calls for stronger measures to strengthen the current international nuclear nonproliferation regime, including recommendations to place civilian processing of weapon-useable material under multinational control. As well, there are calls for entirely new tools, including military options. As proliferation and terrorism concerns grow, the regime is under pressure and there is a temptation to consider fundamental changes to the regime. In this context, this paper will address the following: Do we need to change the regime centered on the Treaty on the Nonproliferation of Nuclear Weapons (NPT) and the International Atomic Energy Agency (IAEA)? What improvements could ensure it will be the foundation for the proliferation resistance and physical protection needed if nuclear power grows? What will make it a viable centerpiece of future nonproliferation and counterterrorism approaches?

  7. Competition Regime

    Directory of Open Access Journals (Sweden)

    Danilo Icaza Ortiz

    2013-01-01

    Full Text Available This paper is a review of the competition regime works of various authors, published under the auspices of the University of the Hemispheres and the Corporation for Studies and Publications. Analyzes the structure, the general concepts, case law taken for development. Includes comments on the usefulness of this work for the study of competition law and the contribution to the lawyers who want to practice in this branch of economic law.

  8. El error, la simulación, el fraude a la ley y el abuso de un derecho en el derecho tributario chileno

    OpenAIRE

    Martínez Cohen,Rafael

    2007-01-01

    La obligación tributaria emana de la ley, y sólo puede nacer de un hecho jurídico, el hecho imponible, no pudiendo generarse a partir del error o de la simulación lícita, por faltar la voluntad en el acto o contrato. La evasión siempre será ilícita, y dará origen al cobro tributario. La elusión será antijurídica si se efectúa con el único fin de defraudar al fisco, en fraude a la ley o en abuso de un derecho, mas sólo podrá solicitarse indemnización de perjuicios por parte del Estado en el ju...

  9. UNA REVISIÓN DE LOS DETERMINANTES DE LA ESTRUCTURA Y EL RECAUDO TRIBUTARIO: EL CASO LATINOAMERICANO TRAS LA CRISIS DE LA DEUDA EXTERNA

    Directory of Open Access Journals (Sweden)

    Víctor Mauricio Castañeda Rodríguez

    2012-12-01

    Full Text Available En este documento se analizan, desde la economía política, los determinantes que pueden explicar la dinámica de la estructura y el recaudo tributario, tomando como referencia el caso de América Latina y las reformas adoptadas parcialmente después de la crisis de la deuda externa para mostrar su pertinencia, dada la heterogeneidad que se encuentra al respecto entre países de la región. Finalmente, con el fin de constatar la importancia de los factores discutidos en términos cuantitativos, se presenta una revisión de trabajos empíricos, aunque concentrando la atención en aquellos que se ocupan de la estructura tributaria.

  10. La delegación del Poder Tributario en el Poder Ejecutivo, su regulación en el Perú y en otros países andinos

    OpenAIRE

    Urquizo Maggia, Daniel Fernando

    2009-01-01

    La presente tesis que lleva por título “La delegación del Poder Tributario en el Poder Ejecutivo, su regulación en el Perú y en otros países andinos” trata sobre la delegación legislativa tributaria regulada en los artículos 74 y 104 de la Carta del Perú aprobada en el año 1993, y en los países andinos de Bolivia, Colombia, Ecuador y Venezuela. La doctrina admite que el poder tributario ya no es atribución exclusiva del Poder Legislativo, que originariamente gozaba de esta facu...

  11. REDISEÑO DE MARCA APLICADO A EMPRESA REAL

    OpenAIRE

    SEGUÍ GASCÓ, MIREIA

    2016-01-01

    [ES] Diseño de una campaña de promoción para la empresa de moda infantil Tutto Piccolo. Introducción de la gamificación para ser aplicada en su packaging. Seguí Gascó, M. (2015). REDISEÑO DE MARCA APLICADO A EMPRESA REAL. http://hdl.handle.net/10251/61800. TFGM

  12. Régimen especial de tributación como mecanismo de desarrollo de las PYMES brasileñas y los retos de la protección del crédito tributario en los procesos concursales

    OpenAIRE

    Lemos Rodrigues de Souza, Roney José

    2016-01-01

    Este trabajo es el resultado de la investigación desarrollada en el programa de Doctorado Interpretación de los derechos y libertades constitucionalmente reconocidos. Se hizo un análisis del régimen especial de tributación como mecanismo de desarrollo de las micro y pequeñas empresas brasileñas (PYMES) y los retos de la protección del crédito tributario en los procesos concursales. La cuestión fue examinada en un triple enfoque, ya que comienza con el análisis de las bases constitucionales pa...

  13. El Sistema de Gestión Financiero de las Instituciones del Sector Público: su convergencia a Normas Internacionales de Contabilidad del Sector Público (NICSP) y sus efectos tributarios

    OpenAIRE

    Guerra Rodríguez, Lorena Matilde

    2016-01-01

    Las Normas Internacionales de Contabilidad aplicadas al Sector Público, NICSP, son estándares de contabilización que por su carácter gubernamental, requiere una aplicación especial que establecen el tipo de información que se debe presentar conjuntamente con los Estados Financieros y su forma de contabilización. La presente tesis de carácter contable-tributario examina las implicaciones que tiene un Sistema de Gestión Financiero de las Instituciones del Sector Público, por la convergencia al ...

  14. Diagnóstico de la gestión empresarial: la industria gráfica y su efecto tributario en el período 1999-2004

    OpenAIRE

    Sánchez Tinoco, Jorge Honorato

    2006-01-01

    La presente investigación se origina y desarrolla a partir de la interrogante central ¿La evolución del sector de la industria gráfica contribuirá a la generación de un proceso de desarrollo económico y tendrá efectos positivos en la redistribución del ingreso?. El estudio propone realizar un diagnóstico de la industria gráfica y su efecto tributario, para lo cual plantea los objetivos siguientes: analizar la situación del sector y determinar los factores que obstaculizan su desarrollo; deter...

  15. Variaciones temporales del fitoplancton de los ríos tributarios y emisario del embalse C. Gelsi (Tucumán, Argentina

    Directory of Open Access Journals (Sweden)

    Silvia N Martinez de Marco

    2012-12-01

    Full Text Available En este trabajo se estudiaron las variaciones temporales del fitoplancton de los tributarios (ríos Salí, Tapia y Vipos y del emisario (río Salí del embalse C. Gelsi. La abundancia algal mínima se obtuvo en verano con una biomasa de 0,19-0,58 µg Cl-a L-1 y la máxima en invierno o primavera con una biomasa de 5,43-6,79 µg Cl-a L-1. En los tributarios se destacaron las diatomeas pennadas sobresaliendo Diatoma vulgare y Cymbella affinis y en el río Salí (emisario dominaron las céntricas especialmente Aulacoseira granulata y Cyclotella meneghiniana. Las Chlorophyta se ubicaron en segundo término en el río Salí, las Cyanobacteria codominaron en los ríos Vipos y Tapia en marzo de 1998 y las Dinophyta sólo fueron observadas en el Salí (emisario. El índice de diversidad específica osciló entre 0,2 y 4,2 y el sapróbico caracterizó las aguas como "no poluídas" o "ligeramente poluídas" en invierno y como "moderadamente poluídas" en verano. El NMDS ordenó temporalmente las muestras según la abundancia de las especies algales consideradas. Los dos primeros ejes del RDA separaron los sitios según gradientes de temperatura, pH, conductividad, DBO5 y nitrato, además de la abundancia de Aulacoseira granulata, Cyclotella meneghiniana, Ulnaria ulna, Cymbella affinis y Leptolyngbya foveolarum.Temporal variations of the phytoplankton of the tributaries and effluent from the C. Gelsi reservoir (Tucumán, Argentina. In this paper we analyzed the phytoplankton variation in the tributaries (Salí, Tapia, and Vipos rivers and effluent (Salí River from the C. Gelsi reservoir according to a seasonal gradient. The minimum algal abundance took place in summer with a biomass of 0.19-0.58 µg Cl-a L-1, while the maximum occurred in winter or in spring, with a biomass of 5.43-6.79 µg Cl-a L-1. In the tributaries pennate diatoms prevailed, Diatoma vulgare and Cymbella affinis were most abundant, while in the Salí river (Gelsi effluent centric

  16. Consideraciones generales de mecanismos técnicos tributarios a los pequeños comerciantes de la Bahía de Guayaquil

    Directory of Open Access Journals (Sweden)

    Rosa Elena Ordoñez Vivero

    2016-06-01

    Full Text Available Al referimos a la cultura tributaria como un criterio de evaluación técnica financiera del Estado, nos remitimos a las diferentes acciones que se han tomado, ya sea por la naturaleza de los fondos que se recaudan o por el destino específico dentro del presupuesto de la hacienda pública; los programas sociales que desarrollan cada uno de los gobiernos de turno, tiende a ser un tema delicado. El retraso y la evasión en el pago de impuestos no son nuevos en el sistema de la tributación pública. La situación de la informalidad en el comercio de las diferentes ciudades del país, requiere de atención permanente. Socializar la cultura fiscal a los ecuatorianos en general debe ser una política de estado, no como acto reprensorio, si no como instrumento de elevación moral, cultural y de responsabilidad social. La no recaudación de los impuestos o la baja recaudación de los mismos impide, con facilidad desarrollar los planes establecidos, por ello es menester que los organismos de control fiscal, determinen con claridad, eficacia y eficiencia los focos de incumplimiento tributario ya sean estos formales e informales, para optimizar los procesos de recaudación fiscal.

  17. Sustainable urban regime adjustments

    DEFF Research Database (Denmark)

    Quitzau, Maj-Britt; Jensen, Jens Stissing; Elle, Morten

    2013-01-01

    The endogenous agency that urban governments increasingly portray by making conscious and planned efforts to adjust the regimes they operate within is currently not well captured in transition studies. There is a need to acknowledge the ambiguity of regime enactment at the urban scale. This direc...

  18. Flux scaling: Ultimate regime

    Indian Academy of Sciences (India)

    First page Back Continue Last page Overview Graphics. Flux scaling: Ultimate regime. With the Nusselt number and the mixing length scales, we get the Nusselt number and Reynolds number (w'd/ν) scalings: and or. and. scaling expected to occur at extremely high Ra Rayleigh-Benard convection. Get the ultimate regime ...

  19. Fundamentos del derecho sancionador tributario

    OpenAIRE

    Sánchez Gervilla, Antonio,

    2017-01-01

    Es podria afirmar que el Dret sancionador administratiu, i per tant el Dret sancionador tributari, és una de les branques del Dret que més controvèrsia ha generat des de la seva gènesi; bona prova d'això la podem trobar en la seva evolució històrica, atenent al fet que aquest va evolucionar des del inicialment denominat Dret penal de policia, passant pel Dret penal administratiu, el Dret penal de l'ordre, fins arribar a l'actual Dret sancionador administratiu. En la nostra opin...

  20. Description and discussion of governmental participations for companies producing oil and gas in marginal fields; Descricao e discussao do regime tributario e participacoes governamentais para empresas produtoras de petroleo e gas em campos marginais

    Energy Technology Data Exchange (ETDEWEB)

    Eduardo, Antonio Sergio [Universidade Salvador (UNIFACS), BA (Brazil); Rodrigues, Jose Allankardec Fernandes [Universidade do Estado da Bahia (UNEB), Salvador, BA (Brazil); Rodrigues, Livia da Silva Modesto [Universidade do Estado da Bahia (UNEB), Salvador, BA (Brazil); Universidade Salvador (UNIFACS), BA (Brazil); Fundacao Visconde de Cairu, Salvador, BA (Brazil); Ferreira, Doneivan Fernandes [Universidade Federal da Bahia (UFBA), Salvador, BA (Brazil)

    2012-07-01

    This article reports taxing and government participation in oil and gas extraction in peripheral fields as defined by the Agencia Nacional de Petroleo, Gas Natural e Combustivel (ANP) and the need to discuss the essence of the contributing capacity as a means to take into account the characteristics of this specific niche in gas and oil production. Their own particular policies distinguish them from other segments. The analysis is founded on the Aristotelian view which treats equals equally and unequals unequally. The analysis shows these companies' present situation and makes it clear that taxing in Brazil acts as an obstacle to the development of several sectors, including the small oil and gas production sector. Also worth mentioning is, besides taxes in the oil business, there is also the incidence of financial indemnity established by the Petroleum Law, illustrating an analysis of this legislation. Initially, when peripheral fields are still seen as great opportunities (according to the regulatory definition adopted by the ANP), mainly because of the high price of the barrel of oil (over US$ 100 ) the weight of taxes may not be a critical factor. However, when marginal oil wells do not attract interest in the average independent producer, the only mechanisms capable of extending the activity, and as a consequence, the positive impacts generated in producing communities, may well be tax relief and government involvement. The method used was a reference research and technical visits to leasers of concessions at peripheral fields. The present study will continue with the object of showing econometric models by simulating the impact taxing has on marginal production projects at different stages of maturity. (author)

  1. 'CANDLE' burnup regime after LWR regime

    International Nuclear Information System (INIS)

    Sekimoto, Hiroshi; Nagata, Akito

    2008-01-01

    CANDLE (Constant Axial shape of Neutron flux, nuclide densities and power shape During Life of Energy producing reactor) burnup strategy can derive many merits. From safety point of view, the change of excess reactivity along burnup is theoretically zero, and the core characteristics, such as power feedback coefficients and power peaking factor, are not changed along burnup. Application of this burnup strategy to neutron rich fast reactors makes excellent performances. Only natural or depleted uranium is required for the replacing fuels. About 40% of natural or depleted uranium undergoes fission without the conventional reprocessing and enrichment. If the LWR produced energy of X Joules, the CANDLE reactor can produce about 50X Joules from the depleted uranium left at the enrichment facility for the LWR fuel. If we can say LWRs have produced energy sufficient for full 20 years, we can produce the energy for 1000 years by using the CANDLE reactors with depleted uranium. We need not mine any uranium ore, and do not need reprocessing facility. The burnup of spent fuel becomes 10 times. Therefore, the spent fuel amount per produced energy is also reduced to one-tenth. The details of the scenario of CANDLE burnup regime after LWR regime will be presented at the symposium. (author)

  2. Arctic circulation regimes.

    Science.gov (United States)

    Proshutinsky, Andrey; Dukhovskoy, Dmitry; Timmermans, Mary-Louise; Krishfield, Richard; Bamber, Jonathan L

    2015-10-13

    Between 1948 and 1996, mean annual environmental parameters in the Arctic experienced a well-pronounced decadal variability with two basic circulation patterns: cyclonic and anticyclonic alternating at 5 to 7 year intervals. During cyclonic regimes, low sea-level atmospheric pressure (SLP) dominated over the Arctic Ocean driving sea ice and the upper ocean counterclockwise; the Arctic atmosphere was relatively warm and humid, and freshwater flux from the Arctic Ocean towards the subarctic seas was intensified. By contrast, during anticylonic circulation regimes, high SLP dominated driving sea ice and the upper ocean clockwise. Meanwhile, the atmosphere was cold and dry and the freshwater flux from the Arctic to the subarctic seas was reduced. Since 1997, however, the Arctic system has been under the influence of an anticyclonic circulation regime (17 years) with a set of environmental parameters that are atypical for this regime. We discuss a hypothesis explaining the causes and mechanisms regulating the intensity and duration of Arctic circulation regimes, and speculate how changes in freshwater fluxes from the Arctic Ocean and Greenland impact environmental conditions and interrupt their decadal variability. © 2015 The Authors.

  3. THE INFLUENCED FLOW REGIMES

    Directory of Open Access Journals (Sweden)

    Gavril PANDI

    2011-03-01

    Full Text Available The influenced flow regimes. The presence and activities ofhumanity influences the uniform environmental system, and in this context, therivers water resources. In concordance with this, the natural runoff regime suffersbigger and deeper changes. The nature of these changes depending on the type anddegree of water uses. The multitude of the use cause different types of influence,whit different quantitative aspects. In the same time, the influences havequalitative connotations, too, regarding to the modifications of the yearly watervolume runoff. So the natural runoff regime is modified. After analyzing thedistribution laws of the monthly runoff, there have been differenced four types ofinfluenced runoff regimes. In the excess type the influenced runoff is bigger thanthe natural, continuously in the whole year. The deficient type is characterized byinverse rapports like the first type, in the whole year. In the sinusoidal type, theinfluenced runoff is smaller than the natural in the period when the water isretained in the lake reservoirs, and in the depletion period the situation inverts. Atthe irregular type the ratio between influenced and natural runoff is changeable ina random meaner monthly. The recognition of the influenced regime and the gradeof influence are necessary in the evaluation and analysis of the usable hydrologicalriver resources, in the flood defence activities, in the complex scheme of thehydrographic basins, in the environment design and so on.

  4. Supply regimes in fisheries

    DEFF Research Database (Denmark)

    Nielsen, Max

    2006-01-01

    Supply in fisheries is traditionally known for its backward bending nature, owing to externalities in production. Such a supply regime, however, exist only for pure open access fisheries. Since most fisheries worldwide are neither pure open access, nor optimally managed, rather between the extremes......, the traditional understanding of supply regimes in fisheries needs modification. This paper identifies through a case study of the East Baltic cod fishery supply regimes in fisheries, taking alternative fisheries management schemes and mesh size limitations into account. An age-structured Beverton-Holt based bio......-economic supply model with mesh sizes is developed. It is found that in the presence of realistic management schemes, the supply curves are close to vertical in the relevant range. Also, the supply curve under open access with mesh size limitations is almost vertical in the relevant range, owing to constant...

  5. Efectividad de un programa multicomponente para dejar de fumar aplicado en atención primaria

    Directory of Open Access Journals (Sweden)

    Fernando Alonso-Pérez

    2014-05-01

    Conclusiones: El tratamiento multicomponente aplicado fue altamente efectivo. Se sugiere la conveniencia de realizar un entrenamiento específico a los profesionales de la salud de cara a implantar este tipo de intervenciones en el ámbito de la atención primaria, como alternativa al consejo médico para aquellos fumadores que lo precisen.

  6. Cargo liability regimes

    Science.gov (United States)

    2001-01-01

    There are at present at least three international regimes of maritime cargo liability in force in different countries of the world - the original Hague rules (1924), the updated version known as the Hague-Visby rules (1968, further amended 1979), and...

  7. Trust in regulatory regimes

    NARCIS (Netherlands)

    Six, Frédérique; Verhoest, Koen

    2017-01-01

    Within political and administrative sciences generally, trust as a concept is contested, especially in the field of regulatory governance. This groundbreaking book is the first to systematically explore the role and dynamics of trust within regulatory regimes. Conceptualizing, mapping and analyzing

  8. East Asian welfare regime

    DEFF Research Database (Denmark)

    Abrahamson, Peter

    2017-01-01

    The paper asks if East Asian welfare regimes are still productivist and Confucian? And, have they developed public care policies? The literature is split on the first question but (mostly) confirmative on the second. Care has to a large, but insufficient extent, been rolled out in the region...

  9. International Food Regime

    Directory of Open Access Journals (Sweden)

    A. V. Malov

    2018-01-01

    Full Text Available The review article reveals the content of the concept of Food Regime, which is little-known in the Russian academic reference. The author monitored and codified the semantic dynamic of the terminological unit from its original interpretations to modern formulations based on the retrospective analysis. The rehabilitation of the academic merits of D. Puchala and R. Hopkins — authors who used the concept Food Regime for a few years before its universally recognized origin and official scientific debut, was accomplished with help of historical and comparative methods. The author implemented the method of ascension from the abstract to the concrete to demonstrating the classification of Food Regimes compiled on the basis of geopolitical interests in the sphere of international production, consumption, and distribution of foodstuffs. The characteristic features of historically formed Food Regime were described in the chronological order, as well as modern tendencies possessing reformist potential were identified. In particular, it has been established that the idea of Food Sovereignty (which is an alternative to the modern Corporate Food Regime is the subject for acute academic disputes. The discussion between P. McMichael P. and H. Bernstein devoted to the “peasant question” — mobilization frame of the Food Sovereignty strategy was analyzed using the secondary data processing method. Due to the critical analysis, the author comes to the conclusion that it is necessary to follow the principles of the Food Sovereignty strategy to prevent the catastrophic prospects associated with ecosystem degradation, accelerated erosion of soils, the complete disappearance of biodiversity and corporate autoc racy successfully. The author is convinced that the idea of Food Sovereignty can ward off energetic liberalization of nature, intensive privatization of life and rapid monetization of unconditioned human reflexes.

  10. Floating Exchange Rate Regime

    OpenAIRE

    Quader, Syed Manzur

    2004-01-01

    In recent years, many developing countries having a history of high inflation, unfavorable balance of payment situation and a high level of foreign currencies denominated debt, have switched or are in the process of switching to a more flexible exchange rate regime. Therefore, the stability of the exchange rate and the dynamics of its volatility are more crucial than before to prevent financial crises and macroeconomic disturbances. This paper is designed to find out the reasons behind Bangla...

  11. UNIÓN EUROPEA Y FINANCIACIÓN AUTONÓMICA: LA JURISPRUDENCIA DEL TRIBUNAL DE JUSTICIA SOBRE LOS SISTEMAS TRIBUTARIOS DE LOS ENTES TERRITORIALES SUBESTATALES

    Directory of Open Access Journals (Sweden)

    José Martín y Pérez de Nanclares

    2009-04-01

    Full Text Available The matter of financing sub-State territorial entities is a relevant matter in which Spain is becoming subject to a controversial political and juridical debate. We find ourselves faced with an internal matter and, due to this, each Member State is charged with regulating its articulation according to its national constitutional framework. However, that freedom of internal regulation must be adapted to the Community juridical framework in all cases and not clash with any Community regulations, most particularly, with those related to the juridical regime on State subsidies.Thus, the Courts of Justice of the European Union have successively prepared jurisprudence that began with the Azores case (2006 and was confirmed in the UGT-Rioja case (2008, by virtue of which certain criteria are determined that must coincide in order that a tax subsystem in the autonomous regions – such as that available in the Basque Country and Navarra – may cohabit harmoniously with the national tax system without incurring breach of the juridical regime of State aid foreseen in the Constituting Treaties. Such criteria may be considered as a two-fold system: on one hand, the existence of an asymmetry of competences recognized in constitutional terms between the sub-State territory and the national territory in which it is integrated and, on the other hand, for the sub-State entity to have sufficient autonomy, both in institutional terms, as well as in procedural and economic ones.

  12. Characteristics of regulatory regimes

    Directory of Open Access Journals (Sweden)

    Noralv Veggeland

    2013-03-01

    Full Text Available The overarching theme of this paper is institutional analysis of basic characteristics of regulatory regimes. The concepts of path dependence and administrative traditions are used throughout. Self-reinforcing or positive feedback processes in political systems represent a basic framework. The empirical point of departure is the EU public procurement directive linked to OECD data concerning use of outsourcing among member states. The question is asked: What has caused the Nordic countries, traditionally not belonging to the Anglo-Saxon market-centred administrative tradition, to be placed so high on the ranking as users of the Market-Type Mechanism (MTM of outsourcing in the public sector vs. in-house provision of services? A thesis is that the reason may be complex, but might be found in an innovative Scandinavian regulatory approach rooted in the Nordic model.

  13. Devolución del IVA en instituciones financieras públicas y su impacto en los ingresos del presupuesto del gobierno (aplicado al Banco del Estado)

    OpenAIRE

    Merizalde Vizcaíno, Alberto

    2005-01-01

    El Impuesto al Valor Agregado IVA, que pagan las entidades u organismos del sector público inmersos en la definición del artículo 118 de la Constitución de la República, por los bienes y servicios que adquieren para el normal desenvolvimiento de sus actividades, de acuerdo a la Ley de Régimen Tributario Interno debe ser devuelto por el SRI en un plazo no mayor a treinta días, basados es esta disposición legal, este documento pretende brindar al lector, las bases fundamentales y doctrina...

  14. Algoritmos evolutivos aplicados al diseño inteligente de parques eólicos

    OpenAIRE

    Bilbao, Martín; Alba, Enrique

    2011-01-01

    En este documento se muestran dos tipos de algoritmos metaheurísticos aplicados al diseño inteligente de un parque eólico, la idea básica es utilizar CHC y algoritmos genéticos para obtener una buena configuración de molinos dentro del parque de tal manera que maximicen la energía total producida y minimicen la cantidad de molinos utilizados. En este trabajo analizaremos dos casos de estudios con una distribución real de vientos de la patagonia argentina, un terreno irregular con restriccione...

  15. Desenvolvimento de um sistema de informações geográficas aplicado à maricultura.

    OpenAIRE

    Paes, João Vicente; Universidade do Vale do Itajaí; Bittencourt, Rogério Gonçalves; Universidade do Vale do Itajaí

    2004-01-01

    Este artigo tem como finalidade apresentar o desenvolvimento de um Sistema de Informações Geográficas (SIG) aplicado a Maricultura, onde servirá aos órgãos e pesquisadores que atuam junto a área de maricultura, como uma ferramenta de gerenciamento das informações relacionadas ao cultivo de mariscos, aliando-se uma referência espacial. O local escolhido para aplicar o Sistema de Informações Geográficas (SIG), em especial o SPRING (Sistema de Processamento de Informações Georeferenciadas), foi ...

  16. Análisis de la publicidad aplicado a la Sociología del Consumo

    OpenAIRE

    Martín Gutiérrez, Pedro

    2012-01-01

    Con este documento se pretende dotar al alumnado de un método de análisis de la publicidad gráfica, sobre todo aplicado (aunque no exclusivamente) al periodo en que se desarrolla la sociedad de consumo en España. El objetivo del análisis sociológico del contenido de la publicidad gráfica es poner de manifiesto el sentido del discurso publicitario, en tanto que reflejo discursivo de los procesos sociales, económicos, culturales, etc., de su contexto Sociología y Trabajo Social

  17. Coder Training aplicado a la investigación sobre la publicidad de alimentos

    OpenAIRE

    González-Díaz, Cristina; Iglesias-García, Mar

    2015-01-01

    Tomando como punto de partida el manual de codificación (codebook), este estudio tiene como objetivo general plantear el proceso de trabajo y entrenamiento de los codificadores llevado a cabo para el abordaje de codificación y pilotaje de una plantilla de análisis, aplicado a un proyecto de investigación sobre la publicidad de alimentos. Los principales resultados apuntan a una modificación en la descripción de determinadas variables para ser mejor comprendidas por los codificadores, la neces...

  18. Seletividade do halosulfuron-methyl aplicado em pré-emergência da cultura da mamoneira

    Directory of Open Access Journals (Sweden)

    Renata L. M. da Silva

    2015-07-01

    Full Text Available A mamoneira é bastante sensível à competição, havendo necessidade de ampliar as alternativas de manejo de plantas daninhas, considerando-se principalmente as opções de herbicidas seletivos, visando favorecer a expansão das áreas de cultivo. O objetivo deste trabalho foi avaliar a seletividade do herbicida halosulfuron-methyl para a cultura da mamoneira aplicado em pré-emergência, antes da semeadura. Dois experimentos foram conduzidos em condições de casa-de-vegetação, um com solo arenoso e outro com franco-argilo-arenoso, em delineamento inteiramente casualizado com quatro repetições. Os tratamentos se constituíram de cinco períodos entre a aplicação do herbicida e a semeadura (0, 7, 14, 21 e 28 dias e uma testemunha sem aplicação. As avaliações realizadas foram: altura de plantas aos 7, 14, 21 e 28 dias após a emergência (DAE; diâmetro do caule, área foliar, volume de raízes, massa seca de parte aérea e raízes aos 28 DAE. Halosulfuron-methyl (112,5 g ha-1 é seletivo para a cultura da mamoneira quando aplicado na modalidade de pré-emergência, antes da semeadura.

  19. Evaluación de la eficacia de fungicidas aplicados al suelo y al follaje

    Directory of Open Access Journals (Sweden)

    Quiroga B. Nini Johanna

    2004-12-01

    Full Text Available

    Una de las enfermedades más limitantes en los cultivos de rosa colombianos para exportación es el mildeo velloso, producido por Peronospora sparsa. Dentro de las herramientas más utilizadas para el manejo de la enfermedad es la aplicación de fungicidas, pero poco se conoce sobre su eficacia y la forma de aplicación más efectiva. El objetivo de la investigación fue evaluar la eficacia de las aplicaciones foliares y en aspersión al suelo (“drench” de los fungicidas dimetomorf, fosetil de aluminio y metalaxil+mancozeb, en comparació con un testigo comercial. El diseñ utilizado fue completamente al azar con nueve tratamientos y tres repeticiones. La incidencia y la severidad de la enfermedad fueron evaluadas en las hojas de los estratos inferior, medio y superior de los tallos y se encontraron diferencias significativas entre los tratamientos, asícomo para la incidencia en tallos y botones florales. Las aplicaciones foliares de los fungicidas mostraron un mayor control de la enfermedad. El control más eficaz se obtuvo con fosetil de aluminio aplicado al follaje. Los tratamientos

  20. Current US nuclear liability regime

    International Nuclear Information System (INIS)

    Brown, O.F.

    2000-01-01

    The Price-Anderson Act Adopted by US Congress in 1957 as the world's first national nuclear liability regime. It is a comprehensive, complicated and unique system and stems from special features of US legal regime and federal system of government. It differs from other systems by providing for 'economic', not legal; channeling of liability to facility operator and not recommended as model for other states, but most features adopted by other states and international conventions

  1. Totalitäre Regimes

    OpenAIRE

    Merkel, Wolfgang

    2004-01-01

    "The development of the term and the analytical concept of totalitarianism have gone through several stages since the 1920s. However, even in its most sophisticated form, the version seen in Friedrich/ Brzezinski, the concept exhibits substantial systematic classification problems and analytical weaknesses. This article attempts to frame the type of totalitarian regime within a general typology of political regimes. Special attention is dedicated to the problem of distinguishing autocra...

  2. Endogenous Monetary Policy Regime Change

    OpenAIRE

    Troy Davig; Eric M. Leeper

    2006-01-01

    This paper makes changes in monetary policy rules (or regimes) endogenous. Changes are triggered when certain endogenous variables cross specified thresholds. Rational expectations equilibria are examined in three models of threshold switching to illustrate that (i) expectations formation effects generated by the possibility of regime change can be quantitatively important; (ii) symmetric shocks can have asymmetric effects; (iii) endogenous switching is a natural way to formally model preempt...

  3. Transition from weak wave turbulence regime to solitonic regime

    Science.gov (United States)

    Hassani, Roumaissa; Mordant, Nicolas

    2017-11-01

    The Weak Turbulence Theory (WTT) is a statistical theory describing the interaction of a large ensemble of random waves characterized by very different length scales. For both weak non-linearity and weak dispersion a different regime is predicted where solitons propagate while keeping their shape unchanged. The question under investigation here is which regime between weak turbulence or soliton gas does the system choose ? We report an experimental investigation of wave turbulence at the surface of finite depth water in the gravity-capillary range. We tune the wave dispersion and the level of nonlinearity by modifying the depth of water and the forcing respectively. We use space-time resolved profilometry to reconstruct the deformed surface of water. When decreasing the water depth, we observe a drastic transition between weak turbulence at the weakest forcing and a solitonic regime at stronger forcing. We characterize the transition between both states by studying their Fourier Spectra. We also study the efficiency of energy transfer in the weak turbulence regime. We report a loss of efficiency of angular transfer as the dispersion of the wave is reduced until the system bifurcates into the solitonic regime. This project has recieved funding from the European Research Council (ERC, Grant Agreement No. 647018-WATU).

  4. Y TRANSFERENCIAS EN MÉXICO. Un análisis de equilibrio general aplicado

    Directory of Open Access Journals (Sweden)

    Enrique R. Casares

    2015-01-01

    Full Text Available En este artículo se argumenta que, dada la fuerte concentración del ingreso en México y la estrechez de la base tributaria del ingreso, resulta muy difícil realizar una reforma tributaria que sea recaudatoria y redistributiva. Para ello se construyó un modelo de equilibrio general aplicado que incluye, entre otras cosas, una desagregación de los hogares en 10 niveles de ingreso, la estructura tributaria y de transferencias del país y las esferas productivas y de consumo. Los escenarios confirman que, lograr una recaudación adicional significativa, y mejorar al mismo tiempo la desigualdad del ingreso (medida por el coeficiente de Gini, implica aumentos de tasas o bases difíciles de lograr en las condiciones actuales.

  5. Carácter jurisdiccional de las resoluciones de la Dirección General del Registro Electoral en materia de faltas electorales: especial referencia a la facultad de recabar datos personales protegidos por el secreto bancario o tributario en el marco de una investigación por faltas en materia de financiamiento de los partidos políticos

    Directory of Open Access Journals (Sweden)

    Ruy López González

    2011-01-01

    Full Text Available El artículo aborda el concepto y características distintivas de la función jurisdiccional del Estado. Con este marco teórico se analiza la función jurisdiccional del Tribunal Supremo de Elecciones en materia electoral y se esboza como tesis la delegación legislativa de competencias jurisdiccionales que operó a favor de la Dirección General del Registro Electoral y de Financiamiento de Partidos Políticos en el trámite y sanción de las faltas electorales tipificadas en el nuevo Código Electoral. Bajo esta premisa, se infiere la facultad de la Dirección de recabar pruebas que contengan datos de carácter confidencial protegidos bajo los institutos del secreto bancario o tributario con el objeto de ejercer su competencia sancionadora

  6. On the regimes of premixing

    Energy Technology Data Exchange (ETDEWEB)

    Angelini, S.; Theofanous, T.G.; Yuen, W.W. [California Univ., Santa Barbara, CA (United States). Center for Risk Studies and Safety

    1998-01-01

    The conditions of the MAGICO-2000 experiment are extended to more broadly investigate the regimes of premixing, and the corresponding internal structures of mixing zones. With the help of the data and numerical simulations using the computer code PM-ALPHA, we can distinguish extremes of behavior dominated by inertia and thermal effects - we name these the inertia and thermal regimes, respectively. This is an important distinction that should guide future experiments aimed at code verification in this area. Interesting intermediate behaviors are also delineated and discussed. (author)

  7. Land degradation and property regimes

    Science.gov (United States)

    Paul M. Beaumont; Robert T. Walker

    1996-01-01

    This paper addresses the relationship between property regimes and land degradation outcomes, in the context of peasant agriculture. We consider explicitly whether private property provides for superior soil resource conservation, as compared to common property and open access. To assess this we implement optimization algorithms on a supercomputer to address resource...

  8. Regime identification in ASDEX Upgrade

    International Nuclear Information System (INIS)

    Giannone, L; Sips, A C C; Kardaun, O; Spreitler, F; Suttrop, W

    2004-01-01

    The ability to recognize the transition from the L-mode to the H-mode or from the H-mode to the improved H-mode reliably from a conveniently small number of measurements in real time is of increasing importance for machine control. Discriminant analysis has been applied to regime identification of plasma discharges in the ASDEX Upgrade tokamak. An observation consists of a set of plasma parameters averaged over a time slice in a discharge. The data set consists of all observations over different discharges and time slices. Discriminant analysis yields coefficients allowing the classification of a new observation. The results of a frequentist and a formal Bayesian approach to discriminant analysis are compared. With five plasma variables, a failure rate of 1.3% for predicting the L-mode and the H-mode confinement regime was achieved. With five plasma variables, a failure rate of 5.3% for predicting the H-mode and the improved H-mode confinement regime was achieved. The coefficients derived by discriminant analysis have been applied subsequently to discharges to illustrate the operation of regime identification in a real time control system

  9. Monetary regimes in open economies

    NARCIS (Netherlands)

    Korpos, A.

    2006-01-01

    This thesis presents a two-country open economy framework for the analysis of strategic interactions among monetary authorities and wage bargaining institutions. From this perspective, the thesis investigates the economic consequences of replacing flexible and fixed exchange rate regimes with a

  10. Exchange rate regimes and monetary arrangements

    Directory of Open Access Journals (Sweden)

    Ivan Ribnikar

    2005-06-01

    Full Text Available There is a close relationship between a country’s exchange rate regime and monetary arrangement and if we are to examine monetary arrangements then exchange rate regimes must first be analysed. Within the conventional and most widely used classification of exchange rate regimes into rigid and flexible or into polar regimes (hard peg and float on one side, and intermediate regimes on the other there, is a much greater variety among intermediate regimes. A more precise and, as will be seen, more useful classification of exchange rate regimes is the first topic of the paper. The second topic is how exchange rate regimes influence or determine monetary arrangements and monetary policy or monetary policy regimes: monetary autonomy versus monetary nonautonomy and discretion in monetary policy versus commitment in monetary policy. Both topics are important for countries on their path to the EU and the euro area

  11. Detecting spatial regimes in ecosystems

    Science.gov (United States)

    Sundstrom, Shana M.; Eason, Tarsha; Nelson, R. John; Angeler, David G.; Barichievy, Chris; Garmestani, Ahjond S.; Graham, Nicholas A.J.; Granholm, Dean; Gunderson, Lance; Knutson, Melinda; Nash, Kirsty L.; Spanbauer, Trisha; Stow, Craig A.; Allen, Craig R.

    2017-01-01

    Research on early warning indicators has generally focused on assessing temporal transitions with limited application of these methods to detecting spatial regimes. Traditional spatial boundary detection procedures that result in ecoregion maps are typically based on ecological potential (i.e. potential vegetation), and often fail to account for ongoing changes due to stressors such as land use change and climate change and their effects on plant and animal communities. We use Fisher information, an information theory-based method, on both terrestrial and aquatic animal data (U.S. Breeding Bird Survey and marine zooplankton) to identify ecological boundaries, and compare our results to traditional early warning indicators, conventional ecoregion maps and multivariate analyses such as nMDS and cluster analysis. We successfully detected spatial regimes and transitions in both terrestrial and aquatic systems using Fisher information. Furthermore, Fisher information provided explicit spatial information about community change that is absent from other multivariate approaches. Our results suggest that defining spatial regimes based on animal communities may better reflect ecological reality than do traditional ecoregion maps, especially in our current era of rapid and unpredictable ecological change.

  12. Cloud regimes as phase transitions

    Science.gov (United States)

    Stechmann, Samuel; Hottovy, Scott

    2017-11-01

    Clouds are repeatedly identified as a leading source of uncertainty in future climate predictions. Of particular importance are stratocumulus clouds, which can appear as either (i) closed cells that reflect solar radiation back to space or (ii) open cells that allow solar radiation to reach the Earth's surface. Here we show that these clouds regimes - open versus closed cells - fit the paradigm of a phase transition. In addition, this paradigm characterizes pockets of open cells (POCs) as the interface between the open- and closed-cell regimes, and it identifies shallow cumulus clouds as a regime of higher variability. This behavior can be understood using an idealized model for the dynamics of atmospheric water as a stochastic diffusion process. Similar viewpoints of deep convection and self-organized criticality will also be discussed. With these new conceptual viewpoints, ideas from statistical mechanics could potentially be used for understanding uncertainties related to clouds in the climate system and climate predictions. The research of S.N.S. is partially supported by a Sloan Research Fellowship, ONR Young Investigator Award N00014-12-1-0744, and ONR MURI Grant N00014-12-1-0912.

  13. Negligência infantil a partir do Child Neglect Index aplicado no Brasil

    Directory of Open Access Journals (Sweden)

    Mara Silvia Pasian

    2015-03-01

    Full Text Available Este estudo objetivou descrever a utilização do Child Neglect Indexpara identificar casos de crianças negligenciadas por seus pais/cuidadores no contexto brasileiro. Após adaptação inicial à realidade sociocultural brasileira, o instrumento foi aplicado em três grupos de indivíduos, cada qual com 30 díades de crianças/pais, totalizando 90 díades (n=180, assim compostos: G1 (primeiro grupo = casos oficialmente notificados por negligência infantil; G2 (segundo grupo = casos suspeitos de negligência não notificados; G3 (terceiro grupo = casos sem suspeita de negligência ou outra forma de maus-tratos (grupo de comparação; além de um quarto grupo de professoras dessas crianças (n=11. Os resultados apontaram altos escores no índice de negligência em G1 e G2, e baixos escores em G3, sugerindo presença de indicadores de falta de supervisão parental referentes a cuidados com alimentação, vestimenta, higiene, saúde física, saúde mental e educação nos dois primeiros grupos avaliados, comparativamente às crianças sem suspeita de maus-tratos. Os atuais achados empíricos, embora preliminares em termos de adaptação do Child Neglect Index ao contexto do Brasil, foram promissores ao sinalizar potencial do instrumento como recurso para detecção/confirmação da negligência infantil, estimulando novas investigações e aprimoramento desse recurso técnico para favorecer adequada identificação e intervenção nesses casos.

  14. Métodos de análisis aplicados al estudio de la obra de arte

    Directory of Open Access Journals (Sweden)

    Muro García, Carmen

    1999-09-01

    Full Text Available Not available.La contribución de disciplinas científicas como la química, física, biología, entre otras, al estudio de las obras de arte ha abierto en los últimos tiempos un fecundo campo de investigación, de intercambio y de colaboración interdisciplinar con el objetivo de mejorar el conocimiento y la conservación de nuestro patrimonio. En este artículo se expone con carácter general el papel que crecientemente desempeñan los métodos de análisis aplicados a las obras de arte, sus principales objetivos y funciones y una breve visión de algunas de las diferentes técnicas empleadas. El doble concepto de conocimiento y conservación como objetivo final de la investigación aplicada a este campo nos abre paso a una gran diversidad de funciones concretas que estas técnicas procuran: el estudio de la obra de arte en su etapa original, de sus transformaciones, de su estado de conservación, su cronología, la constatación de su autoría; así como también otros objetivos relacionados con la optimización de las técnicas de intervención y las condiciones de conservación preventiva. Se exponen los objetivos y funciones de algunas de las principales técnicas usadas. Todas ellas ponen a disposición del análisis de la obra de arte un conjunto de informaciones que complementan el tradicional acercamiento a este ámbito de nuestra cultura.

  15. INDICADORES DE CAPACIDAD APLICADOS A LA DESERCIÓN EN LAS UNIVERSIDADES COLOMBIANAS

    Directory of Open Access Journals (Sweden)

    José Daniel Mosquera Artamónov

    2011-01-01

    Full Text Available En este trabajo, se presenta una propuesta para implementar los Índices de Capacidad de un Proceso como herramienta para medir la efectividad de un proceso social. Estos índices son ampliamente empleados en la industria de productos de consumo, pero no es clara la forma como pueden ser usados en el control de procesos sociales. El trabajo se centra en el análisis de aquellos procesos que no están normalmente distribuidos y que por lo tanto, en una primera aproximación teórica, no son susceptibles de ser controlados con el uso de Índices de Capacidad. Mediante un doble ejemplo aplicado al caso de la deserción en las universidades colombianas, se ofrece una metodología detallada de cómo solucionar el problema de la no normalidad de los datos con el uso de la transformación de Box-Cox, la distribución de Weibull y el método de percentiles de Clements. De esta manera, se demuestra la aplicabilidad de los métodos ya contrastados en otros ámbitos, a casos concretos de deserción en las universidades colombianas. El método de índices de capacidad puede usarse para evaluar el proceso de deserción y definir las metas reales de deserción, posibles de cumplir. Se propone además, que esta metodología sea usada en el control de otros procesos sociales.

  16. Stochastic dynamical models for ecological regime shifts

    DEFF Research Database (Denmark)

    Møller, Jan Kloppenborg; Carstensen, Jacob; Madsen, Henrik

    the physical and biological knowledge of the system, and nonlinearities introduced here can generate regime shifts or enhance the probability of regime shifts in the case of stochastic models, typically characterized by a threshold value for the known driver. A simple model for light competition between...... definition and stability of regimes become less subtle. Ecological regime shifts and their modeling must be viewed in a probabilistic manner, particularly if such model results are to be used in ecosystem management....

  17. Alberta oil sands royalty regime

    International Nuclear Information System (INIS)

    Asgarpour, S.

    2004-01-01

    The long term objective of the Oil Sands Business Unit of Alberta Energy is to pave the way for Alberta's bitumen production to reach 3 million barrels per day by 2020. This presentation described the national government's role in resource development. It was emphasized that since the Crown is the owner of the oil sands resource, it would benefit by providing strategic leadership and by generating a larger royalty base. The oil sands fiscal regime was described with reference to generic royalty, risk sharing, investment, and project economics. Business rule principles were also outlined along with criteria for project expansions. Both upstream and downstream challenges and opportunities were listed. 4 figs

  18. Adaptation in Collaborative Governance Regimes

    Science.gov (United States)

    Emerson, Kirk; Gerlak, Andrea K.

    2014-10-01

    Adaptation and the adaptive capacity of human and environmental systems have been of central concern to natural and social science scholars, many of whom characterize and promote the need for collaborative cross-boundary systems that are seen as flexible and adaptive by definition. Researchers who study collaborative governance systems in the public administration, planning and policy literature have paid less attention to adaptive capacity specifically and institutional adaptation in general. This paper bridges the two literatures and finds four common dimensions of capacity, including structural arrangements, leadership, knowledge and learning, and resources. In this paper, we focus on institutional adaptation in the context of collaborative governance regimes and try to clarify and distinguish collaborative capacity from adaptive capacity and their contributions to adaptive action. We posit further that collaborative capacities generate associated adaptive capacities thereby enabling institutional adaptation within collaborative governance regimes. We develop these distinctions and linkages between collaborative and adaptive capacities with the help of an illustrative case study in watershed management within the National Estuary Program.

  19. Measuring the effectiveness of international environmental regimes

    Energy Technology Data Exchange (ETDEWEB)

    Helm, C.; Sprinz, D.F.

    1999-05-01

    While past research has emphasized the importance of international regimes for international governance, systematic assessments of regime effects are missing. This article derives a standardized measurement concept for the effectiveness of international environmental regimes by developing an operational rational choice calculus to evaluate actual policy simultaneously against a non-regime counterfactual and a collective optimum. Subsequently, the empirical feasibility of the measurement instrument is demonstrated by way of two international treaties regulating transboundary air pollution in Europe. The results demonstrate that the regimes indeed show positive effects - but fall substantially short of the collective optima. (orig.)

  20. Sensitivity to spatial and temporal scale and fire regime inputs in deriving fire regime condition class

    Science.gov (United States)

    Linda Tedrow; Wendel J. Hann

    2015-01-01

    The Fire Regime Condition Class (FRCC) is a composite departure measure that compares current vegetation structure and fire regime to historical reference conditions. FRCC is computed as the average of: 1) Vegetation departure (VDEP) and 2) Regime (frequency and severity) departure (RDEP). In addition to the FRCC rating, the Vegetation Condition Class (VCC) and Regime...

  1. Fire regime in Mediterranean ecosystem

    Science.gov (United States)

    Biondi, Guido; Casula, Paolo; D'Andrea, Mirko; Fiorucci, Paolo

    2010-05-01

    The analysis of burnt areas time series in Mediterranean regions suggests that ecosystems characterising this area consist primarily of species highly vulnerable to the fire but highly resilient, as characterized by a significant regenerative capacity after the fire spreading. In a few years the area burnt may once again be covered by the same vegetation present before the fire. Similarly, Mediterranean conifer forests, which often refers to plantations made in order to reforest the areas most severely degraded with high erosion risk, regenerate from seed after the fire resulting in high resilience to the fire as well. Only rarely, and usually with negligible damages, fire affects the areas covered by climax species in relation with altitude and soil types (i.e, quercus, fagus, abies). On the basis of these results, this paper shows how the simple Drossel-Schwabl forest fire model is able to reproduce the forest fire regime in terms of number of fires and burned area, describing whit good accuracy the actual fire perimeters. The original Drossel-Schwabl model has been slightly modified in this work by introducing two parameters (probability of propagation and regrowth) specific for each different class of vegetation cover. Using model selection methods based on AIC, the model with the optimal number of classes with different fire behaviour was selected. Two different case studies are presented in this work: Regione Liguria and Regione Sardegna (Italy). Both regions are situated in the center of the Mediterranean and are characterized by a high number of fires and burned area. However, the two regions have very different fire regimes. Sardinia is affected by the fire phenomenon only in summer whilst Liguria is affected by fires also in winter, with higher number of fires and larger burned area. In addition, the two region are very different in vegetation cover. The presence of Mediterranean conifers, (Pinus Pinaster, Pinus Nigra, Pinus halepensis) is quite spread in

  2. Conceptos de condicionamiento clásico en los campos básicos y aplicados

    Directory of Open Access Journals (Sweden)

    Andrés M. Pérez

    2003-01-01

    Full Text Available El condicionamiento clásico, lejos de tener una clara y única definición, se presenta en la literatura psicológica básica bajo múltiples conceptos basados en diferentes corrientes epistemológicas, tanto de la psicología como de las neurociencias. El objetivo principal de este artículo es presentar un análisis de la literatura acerca de condicionamiento clásico con el fin de discernir los conceptos, explícitos o implícitos, tanto en el campo básico como en el aplicado, el último principalmente en lo referido a las aplicaciones clínicas (psicoterapia. Se detectaron cuatro conceptos bien diferenciados de condicionamiento clásico: 1 Reflexológico (original pavloviano; 2 Conductista (liderado por B.F. Skinner; 3 Cognoscitivo (liderado por R.A. Rescorla; y 4 Neurobiológico (liderado por Eric R. Kandel. Los dos primeros se refieren más al condicionamiento clásico como método mientras que los dos últimos se refieren al condicionamiento clásico como proceso. En la literatura psicológica clínica los conceptos son más implícitos que explícitos; además tales conceptos son más de tipo reflexológico o conductista que cognoscitivo o neurobiológico. Las aplicaciones detectadas bajo esos conceptos han sido: las terapias aversivas y el recondicionamiento (bajo el concepto reflexológico, las terapias de exposición (bajo el concepto conductista, la formación de preferencias del consumidor hacia marcas publicitarias (bajo el concepto cognoscitivo y el condicionamiento del sistema inmunológico (bajo el concepto neurobiológico. A partir de este análisis conceptual se sugiere partir siempre de un ejercicio de identificación del concepto de condicionamiento clásico que se va a seguir ,con el fin de efectuar futuras intervenciones, clínicas o en cualquier otro campo, más precisas y efectivas.

  3. Recomendações sobre design informacional aplicado em motion graphics

    Directory of Open Access Journals (Sweden)

    André Luiz Fronza

    2014-01-01

    Full Text Available Tendo sua origem no cinema, o motion graphics tornou-se uma linguagem audiovisual bastante difundida a partir dos anos 1990 devido ao avanço tecnológico na área da computação gráfica. É caracterizado por concentrar-se em uma área de criação que permite a combinação e manipulação de ilustrações, elementos gráficos, fotografia e vídeos, num determinado espaço-tempo unido ao uso de música e efeitos sonoros. Neste contexto, o presente artigo relata a pesquisa que objetivou identificar se, para o público jovem, o motion graphicstransmite informações com maior efetividade do que um material estático. Também buscou-se compreender o processo de criação e concepção do motion graphics, tendo o intuito de futuramente formular um guia para os profissionais da área a fim de auxiliá-los no processo de organização visual e cognitiva da mensagem em projetos desse tipo. Para alcance dos objetivos propostos, foi realizada uma pesquisa d e caráter misto, do tipo exploratória, utilizando dados quantitativos obtidos a partir de um questionário fechado aplicado a alunos de Ensino Médio e informações qualitativas provindas de dois focus group com estudantes de Design. Constatou-se que há diferenças na percepção de informações estáticas em comparação às animadas (motion graphics e que o motion designer, ao projetar uma animação,deve ter primor na aplicação dos princípios básicos que concernem o design da informação.

  4. Modelo del Costo Basado en la Actividad aplicado a consultas por trazadores de enfermedades cardiovasculares

    Directory of Open Access Journals (Sweden)

    Marteau Silvia A.

    2001-01-01

    Full Text Available OBJETIVO: Hacer un análisis de costos, de la atención médica en consultas externas, mediante la metodología del Costo Basado en la Actividad (ABC, por sus siglas en inglés y en relación con eventos trazadores de enfermedades cardiovasculares de origen isquémico en las instituciones del sector público. MATERIAL Y MÉTODOS: El estudio se basó en consultas por enfermedades o eventos trazadores (n=290 y no trazadores (n=1 710, de una muestra de 2 000 consultas de primera vez de un hospital zonal general de agudos (San Roque de Gonnet, de la provincia de Buenos Aires, Argentina, y se realizó de abril a octubre de 1998. El costo se evaluó con la metodología del ABC. RESULTADOS: El mejoramiento de las actividades de atención en el servicio de Clínica Médica conllevaría un ahorro sustancial en los costos indirectos, equivalente a un porcentaje promedio de 7.11 sobre los productos definidos como consultas por hipertensión arterial (HTA, dislipidemia y diabetes. El ahorro total en el costo unitario por producto que se produciría si se eliminaran las actividades mencionadas, estaría en el orden de 11.78% para el producto HTA, de 13.96% para dislipidemia, de 19.05% para diabetes y de 11.45% para las enfermedades no trazadores. Se asignó o se gastó ineficientemente 66.26% de los costos totales indirectos correspondientes al producto dislipidemia y 61.80% de los correspondientes a diabetes. El costo unitario total de las consultas en el servicio de Clínica Médica, según el método tradicional, es de $22.98, valor que en algunos casos está muy por debajo del costo obtenido a partir del método ABC aplicado en este estudio. CONCLUSIONES: Es necesario trabajar en el rediseño del proceso de atención para evaluar las actividades que no agreguen valor al mismo; éstas únicamente generan molestias y demoras al paciente y provocan ineficiencias en el sistema, dado que se asignan recursos a actividades que no optimizan la gestión y, como

  5. UNA APROXIMACIÓN AL CONCEPTO DE GERENCIA Y ADMINISTRACIÓN APLICADO A LA DISCIPLINA DE ENFERMERÍA

    OpenAIRE

    Joana Hernández Ortiz

    2010-01-01

    El presente trabajo fue desarrollado mediante la indagación de términos en revistas virtuales en medios electrónicos. El objetivo fue obtener información de las definiciones de gerencia y administración; Al mismo tiempo, realizar la interpretación de datos y efectuar una crítica de cada una de las definiciones seleccionadas, contrastando con los conocimientos de enfermería, ya que estos están forjados dentro del área empresarial. Se utilizó una metodología basada en constructos; aplicados par...

  6. Neoclassical transport in ERS regime

    International Nuclear Information System (INIS)

    Lin, Z.; Tang, W.; Lee, W.W.

    1996-01-01

    The core ion thermal conductivity has been observed to fall below the standard neoclassical level in recent TFTR reversed magnetic shear discharges. Due to the combination of high central q and small local inverse aspect ratio, the ion poloidal gyroradius can be larger than the minor radius and comparable to the pressure gradient scale length in this ERS regime. It is then expected that finite orbit width effects play a key role in modifying the standard picture of neoclassical transport. Specifically, both the trapped particle fraction and the banana orbit width axe reduced by the finite minor radius and possibly by the pressure-gradient-driven radial electric field. In addition, the steep pressure gradient can generate neoclassical poloidal flows which, in turn, could reduce the particle and heat transports. Results from analytic estimates as well as those from full toroidal gyrokinetic neoclassical simulations will be presented

  7. Unitary Housing Regimes in Transition

    DEFF Research Database (Denmark)

    Bengtsson, Bo; Jensen, Lotte

    2013-01-01

    Path dependence is strong in housing institutions and policy. In both Denmark and Sweden, today’s universal and ‘unitary’ (Kemeny) housing regimes can be traced back to institutions that were introduced fifty years back in history or more. Recently, universal and unitary housing systems...... in Scandinavia, and elsewhere, are under challenge from strong political and economic forces. These challenges can be summarized as economic cutbacks, privatization and Europeanization. Although both the Danish and the Swedish housing system are universal and unitary in character, they differ considerably...... in institutional detail. Both systems have corporatist features, however in Denmark public housing is based on local tenant democracy and control, and in Sweden on companies owned and controlled by the municipalities, combined with a centralized system of rent negotiations. In the paper the present challenges...

  8. Reassessing the nuclear liability regime

    International Nuclear Information System (INIS)

    Havinh Phuong

    1985-01-01

    The nuclear liability regime was thoroughly reviewed by nuclear plant operators, officials of regulatory authorities, and legal and insurance experts at the Symposium on Nuclear Third Party Liability and Insurance, held in September 1984 in Munich, Federal Republic of Germany. The symposium highlighted specific areas where adjustments or improvements would be needed in order to cope with practical problems encountered or emerging issues. By focusing on questions of legitimate concern to the public, it also sought to promote confidence in a compensation system for public protection that is in many ways unique. Topics addressed included the following: greater harmonization of the compensation amounts for nuclear damage established in different countries and in territorial scope; the concept of unlimited liability; the time limitation for compensation claims; the problem of proving causation; the concept of nuclear damage; and insurance coverage

  9. Hall effect in hopping regime

    International Nuclear Information System (INIS)

    Avdonin, A.; Skupiński, P.; Grasza, K.

    2016-01-01

    A simple description of the Hall effect in the hopping regime of conductivity in semiconductors is presented. Expressions for the Hall coefficient and Hall mobility are derived by considering averaged equilibrium electron transport in a single triangle of localization sites in a magnetic field. Dependence of the Hall coefficient is analyzed in a wide range of temperature and magnetic field values. Our theoretical result is applied to our experimental data on temperature dependence of Hall effect and Hall mobility in ZnO. - Highlights: • Expressions for Hall coefficient and mobility for hopping conductivity are derived. • Theoretical result is compared with experimental curves measured on ZnO. • Simultaneous action of free and hopping conduction channels is considered. • Non-linearity of hopping Hall coefficient is predicted.

  10. Hall effect in hopping regime

    Energy Technology Data Exchange (ETDEWEB)

    Avdonin, A., E-mail: avdonin@ifpan.edu.pl [Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warszawa (Poland); Skupiński, P. [Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warszawa (Poland); Grasza, K. [Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warszawa (Poland); Institute of Electronic Materials Technology, ul. Wólczyńska 133, 01-919 Warszawa (Poland)

    2016-02-15

    A simple description of the Hall effect in the hopping regime of conductivity in semiconductors is presented. Expressions for the Hall coefficient and Hall mobility are derived by considering averaged equilibrium electron transport in a single triangle of localization sites in a magnetic field. Dependence of the Hall coefficient is analyzed in a wide range of temperature and magnetic field values. Our theoretical result is applied to our experimental data on temperature dependence of Hall effect and Hall mobility in ZnO. - Highlights: • Expressions for Hall coefficient and mobility for hopping conductivity are derived. • Theoretical result is compared with experimental curves measured on ZnO. • Simultaneous action of free and hopping conduction channels is considered. • Non-linearity of hopping Hall coefficient is predicted.

  11. Accommodating human values in the climate regime

    Directory of Open Access Journals (Sweden)

    Rosalind Cook

    2008-12-01

    Full Text Available The climate regime addresses one of the most important challenges facing humankind today. However, while the environmental and economic sides of the problem are well represented, it lacks the inclusion of social and human aspects. The human rights regime, in contrast, is a regime which has been established precisely to implement human values. This article ex-plains the problems of climate change in terms of human values and argues that some proce-dures from the human rights regime offer possibilities for improvement. It is submitted that through the inclusion of human rights instruments, such as individual communication, pro-gressive realisation and authoritative interpretation, the inclusion of human values into the climate regime will be facilitated. This article presents these instruments and discusses their potential for inclusion in the climate regime.

  12. De Facto Regimes in International Law

    OpenAIRE

    Essen, Jonte van

    2012-01-01

    The ambiguous position of de facto regimes in international law has long been the subject of scholarly debate and a source of political conflict. An assessment of the current standing of these regimes in international law and the consequences of actions by international actors on this status has, however, been long overdue. The manner in which de facto regimes are regarded internationally has serious consequences for the individuals under the influence of this legal grey area. Therefore, the ...

  13. Proliferation Control Regimes: Background and Status

    National Research Council Canada - National Science Library

    Nikitin, Mary B; Kerr, Paul; Bowman, Steve; Hildreth, Steven A

    2008-01-01

    .... national security interests. Multilateral regimes were established to restrict trade in nuclear, chemical, and biological weapons and missile technologies, and to monitor their civil applications...

  14. Proliferation Control Regimes: Background and Status

    National Research Council Canada - National Science Library

    Squassoni, Sharon; Bowman, Steve; Hildreth, Steven A

    2006-01-01

    .... national security interests. Multilateral regimes were established to restrict trade in nuclear, chemical, and biological weapons and missile technologies, and to monitor their civil applications...

  15. INDICADORES DE CONTAMINACIÓN FECAL EN BIOSÓLIDOS APLICADOS EN AGRICULTURA

    Directory of Open Access Journals (Sweden)

    Carolina Guzmán

    2004-12-01

    todos los usos. Aunque la determinación y cuantificación de fagos somáticos y fagos F-específicos no son parámetros propuestos en la norma EPA/625/R-92/013 (1999, las concentraciones de estos microorganismos en el biosólido son indicadores de la posible presencia de virus entéricos en las muestras analizadas. Con base en estos resultados se puede concluir que este producto puede ser aplicado en agricultura teniendo en cuenta el tiempo de restricción previo al cultivo para reducir el riesgo sanitario.

  16. Capacitance densitometer for flow regime identification

    International Nuclear Information System (INIS)

    Shipp, R.L. Jr.

    1978-01-01

    This invention relates to a capacitance densitometer for determining the flow regime of a two-phase flow system. A two-element capacitance densitometer is used in conjunction with a conventional single-beam gamma densitometer to unambiguously identify the prevailing flow regime and the average density of a flowing fluid

  17. TARIFFS AND REGIMES OF POWER CONSUMPTION

    Directory of Open Access Journals (Sweden)

    S. V. Batsova

    2010-01-01

    Full Text Available Analysis of regimes of electro-consumption at RUP «BMZ» is carried out. It is shown that in conditions of rapid growth of prices for electric power one of the conditions of reduction of production expenses is to be the increase of efficiency of the electro-consumption regimes control.

  18. Strengthening the nuclear non-proliferation regime

    International Nuclear Information System (INIS)

    Carlson, J.

    2003-01-01

    Although the nuclear non-proliferation regime has enjoyed considerable success, today the regime has never been under greater threat. Three states have challenged the objectives of the NPT, and there is a technology challenge - the spread of centrifuge enrichment technology and know-how. A major issue confronting the international community is, how to deal with a determined proliferator? Despite this gloomy scenario, however, the non-proliferation regime has considerable strengths - many of which can be developed further. The regime comprises complex interacting and mutually reinforcing elements. At its centre is the NPT - with IAEA safeguards as the Treaty's verification mechanism. Important complementary elements include: restraint in the supply and the acquisition of sensitive technologies; multilateral regimes such as the CTBT and proposed FMCT; various regional and bilateral regimes; the range of security and arms control arrangements outside the nuclear area (including other WMD regimes); and the development of proliferation-resistant technologies. Especially important are political incentives and sanctions in support of non-proliferation objectives. This paper outlines some of the key issues facing the non-proliferation regime

  19. Synergies between nonproliferation regimes: A pragmatic approach

    International Nuclear Information System (INIS)

    Findlay, Trevor; Meier, Oliver

    2001-01-01

    Full text: With the recent progress in establishing international nonproliferation regimes, the question of synergies between different verification and monitoring regimes is becoming more acute. Three multilateral and universal nonproliferation organisations covering safeguards on civil nuclear materials, nuclear testing, and chemical weapons are up and running. A regime on biological weapons is under negotiation. Several regional organisations concerned with monitoring nonproliferation commitments in the nuclear field are in place; others are being established. Past discussions on synergies between these regimes have suffered from being too far-reaching. These discussions often have not reflected adequately the political difficulties of cooperation between regimes with different membership, scope and institutional set-up. This paper takes a pragmatic look at exploiting synergies and identifies some potential and real overlaps in the work between different verification regimes. It argues for a bottom-up approach and identifies building blocks for collaboration between verification regimes. By realising such, more limited potential for cooperation, the ground could be prepared for exploiting other synergies between these regimes. (author)

  20. Multiscale regime shifts and planetary boundaries

    NARCIS (Netherlands)

    Hughes, T.P.; Carpenter, S.; Rockstrom, J.; Scheffer, M.; Walker, B.

    2013-01-01

    Life on Earth has repeatedly displayed abrupt and massive changes in the past, and there is no reason to expect that comparable planetary-scale regime shifts will not continue in the future. Different lines of evidence indicate that regime shifts occur when the climate or biosphere transgresses a

  1. Crustal stress regime in Italy

    Directory of Open Access Journals (Sweden)

    M. Cesaro

    1997-06-01

    Full Text Available In order to obtain a reliable map of the present-day stress field in Italy, needed to better understand the active tectonic processes and to contribute to the assessment of seismic hazard, in 1992 we started to collect and analyze new data from borehole breakouts in deep oil and geothermal wells and focal mechanisms of earthquakes (2.5 < M <5 occurred in Italy between 1988 and 1995. From about 200 deep wells and 300 focal mechanisms analyzed to date, we infer that: the internal (SW sector of the Northern Apenninic arc is extending with minimum compressional stress (Shmin oriented ? ENE, while the external front is thrusting over the Adriatic foreland (Shmin ? NW-SE. The entire Southern Apennine is extending in NE direction (from the Tyrrhenian margin to the Apulian foreland and compression (in the foredeep is no longer active at the outer (NE thrust front. Between these two arcs, an abrupt change in the tectonic regime is detected with directions of horizontal stress changing by as much as 90º in the external front, around latitude 430N. Along the Ionian side of the Calabrian arc the stress directions inferred from breakouts and focal mechanisms are scattered with a hint of rotation from N-S Shmin close to the Southern Apennines, to ~ E-W directions in the Messina Strait. In Sicily, a NW-SE direction of SHmax is evident in the Hyblean foreland, parallel to the direction of plate motion between Africa and Europe. A more complex pattern of stress directions is observed in the thrust belt zone, with rotations from the regional trend (NW í directed SHmax to NE oriented SHmax. A predominant NW direction of SHmax is also detected in mainland Sicily from earthquake focal mechanisms, but no well data are available in this region. In the northern part of Sicily (Aeolian Islands a ~N-S direction of SHmax is observed.

  2. Abrupt climate-independent fire regime changes

    Science.gov (United States)

    Pausas, Juli G.; Keeley, Jon E.

    2014-01-01

    Wildfires have played a determining role in distribution, composition and structure of many ecosystems worldwide and climatic changes are widely considered to be a major driver of future fire regime changes. However, forecasting future climatic change induced impacts on fire regimes will require a clearer understanding of other drivers of abrupt fire regime changes. Here, we focus on evidence from different environmental and temporal settings of fire regimes changes that are not directly attributed to climatic changes. We review key cases of these abrupt fire regime changes at different spatial and temporal scales, including those directly driven (i) by fauna, (ii) by invasive plant species, and (iii) by socio-economic and policy changes. All these drivers might generate non-linear effects of landscape changes in fuel structure; that is, they generate fuel changes that can cross thresholds of landscape continuity, and thus drastically change fire activity. Although climatic changes might contribute to some of these changes, there are also many instances that are not primarily linked to climatic shifts. Understanding the mechanism driving fire regime changes should contribute to our ability to better assess future fire regimes.

  3. De Facto Regimes in International Law

    Directory of Open Access Journals (Sweden)

    Jonte van Essen

    2012-02-01

    Full Text Available The ambiguous position of de facto regimes in international law has long been the subject of scholarly debate and a source of political conflict. An assessment of the current standing of these regimes in international law and the consequences of actions by international actors on this status has, however, been long overdue. The manner in which de facto regimes are regarded internationally has serious consequences for the individuals under the influence of this legal grey area. Therefore, the study into this problem and possible solutions is of great significance. The 2011 developments in Northern Africa underline the need of contemporary research into this area. This essay aims to clarify the position of de facto regimes in international law and the influence on their status by actions of international actors. The author first argues that de facto regimes have rights and obligations under international law, which provide them with (some form of international legal personality. He then pleads for a reconsideration of the contemporary legal treatment of these regimes. The author argues against the current system of government recognition and proposes a system that better addresses the needs of both de facto regimes and the international community. 

  4. Feasibility of a dual regime gyrotron

    International Nuclear Information System (INIS)

    Sawant, Ashwini; Jain, Prerit; Kartikeyan, M.V.

    2012-01-01

    The design concept of a 42/84 GHz, 500 kW, CW, dual-regime gyrotron for ECRH of plasma in an experimental Tokamak will be presented in this paper. Operation at 42 GHz is fundamental where as that in 84 GHz will be second harmonic so that a similar guidance system will be retained for dual regime operation. In this paper, the mode competition and mode selection procedures are presented for such a dual regime operation. Cold cavity design and self-consistent calculations will be carried out for power and efficiencies. (author)

  5. Can Old Regimes Handle New Wars?

    DEFF Research Database (Denmark)

    Henningsen, Troels

    Research on New Wars argues that since the 1980s states and regimes have become more vulnerable to violence from non-state actors. Two developments in the Sahel region support the New Wars thesis: an increase in Islamist radicalization and new access to the global black market, both of which......, the paper finds that regimes in the Sahel region are still able to cope with the rise in non-state threats. The paper first shortly compares the longevity of the present regimes in the Sahel region to all previous ones, second examines in-depth how Chad and Mali fight the insurgents. Findings are that since...

  6. Framing of regimes and transition strategies

    DEFF Research Database (Denmark)

    Jensen, Jens Stissing

    2012-01-01

    This article suggests that transition strategies are always formulated in the context of specific representations of the regime and the challenges it faces. It is argued that the framing of a regime affects the envisioning of transition strategies. An analysis of the current development agenda...... for the housing construction sector in Denmark reveals the relevance and impacts of different regime framings. It is proposed that the ability to cope with framing issues as situated and political processes is at the core of the governance of transitions....

  7. FEL in transverse optical klystron regime

    International Nuclear Information System (INIS)

    Scarlat, F.; Baltateanu, N.

    1994-01-01

    Among all operational regimes of free electron laser (FEL), the transverse optical regime (TOK) requires the least stringent electron beam parameters. The device associated to this regime, also defined as FEL with two or more components, consists of two or more identical interaction sections separated by one or more drift distances among themselves. Starting from the motion equations which describe the interaction between an electron and the radiation inside the undulator, one can obtain some practical expressions for the calculation of the efficiency of the energy transfer from the electron to the radiation, and the gain of the external coherent radiation for a FEL in TOK with three cavities. (Author)

  8. The Two Regimes of Postwar Shipping

    DEFF Research Database (Denmark)

    Iversen, Martin Jes; Tenold, Stig

    2014-01-01

    the bargaining that accompanied the shift from the national regime to the competitive regime. Specifically, we show that the new regime primarily accommodated the interests of private actors such as shipping companies, rather than the interests of the authorities and the trade unions.......The aim of this article is to illustrate the most important changes in the regulatory framework of the shipping sector from the 1960s to 2010, and to analyse the basis for, and effects of, these changes. In order to explain how the transformation has occurred, we use two traditional maritime...... nations—Denmark and Norway—as case studies. First, we introduce the two regimes of Danish and Norwegian shipping: ‘the national regime’ from the early 1960s to the mid-1970s; and ‘the competitive regime’, which was fully established by the middle of the 1990s and still persists. Then, we briefly sketch...

  9. The international climate regime: towards consolidation collapse

    International Nuclear Information System (INIS)

    Berthaud, P.; Cavard, D.; Criqui, P.

    2003-10-01

    This article deals with the different modalities that exist to manage a problem of collective action in the field of climate negotiation. It uses two concepts of the International Political Economy (IPE): the concept of International Regime (IR) and the concept of Hegemony and / or Leadership. The course the international negotiation has taken between 1992 (Rio Convention) and march 2001 (the US rejection of the Kyoto Protocol of 1997) leads us, first, to question the conditions of existence as well as the viability of a non-hegemonic International Regime (Part One). Then, we discuss the perspectives for the 'post - Kyoto' era. After having examined the preferences of the three most active actors in the negotiation (USA, Europe, G77 + China) combined with the leadership capacities they possess, we identify three scenarios for the future: i) anarchy, ii) an international regime under the American hegemony, iii) an international regime under the European leadership (Part Two). (author)

  10. The CTBT regime, significance and potential benefits

    International Nuclear Information System (INIS)

    Chang, Hong-Lae

    2002-01-01

    This presentation briefly outlines the CTBT's background, describes the activities of the Preparatory Commission, the verification regime, the role of the National Data Centres and international coopereation. The objectives of the Nairobi workshop are listed

  11. Improving the taxation regime for electric power

    International Nuclear Information System (INIS)

    Fjermeros, Morten; Ilstad, Kristine

    2003-01-01

    In Norway, the present taxation regime for electric power is very complex. The power companies are currently charged with ordinary tax on profits, tax on economic rent, tax on natural resources and land tax. In addition there are the rules about licence fees, yield of power due to concession conditions, and reversion. The Norwegian Electricity Industry Association (EBL), assisted by a firm of lawyers, has proposed an improvement over the current taxation regime

  12. Brazil in the global anticorruption regime

    Directory of Open Access Journals (Sweden)

    Marcos Tourinho

    2018-03-01

    Full Text Available Abstract Brazilian anticorruption law and institutions were significantly transformed in recent decades. This article traces those transformations and explains how the international anticorruption and money laundering regimes contributed to their development. It argues that those international regimes were internalised in the Brazilian system through three mechanisms: inspiration and legitimation, coercion, and implementation support, and were critical to the transformation of Brazilian institutions.

  13. Portfolio Selection with Jumps under Regime Switching

    Directory of Open Access Journals (Sweden)

    Lin Zhao

    2010-01-01

    Full Text Available We investigate a continuous-time version of the mean-variance portfolio selection model with jumps under regime switching. The portfolio selection is proposed and analyzed for a market consisting of one bank account and multiple stocks. The random regime switching is assumed to be independent of the underlying Brownian motion and jump processes. A Markov chain modulated diffusion formulation is employed to model the problem.

  14. Do discriminatory pay regimes unleash antisocial behavior?

    OpenAIRE

    Grosch, Kerstin; Rau, Holger A.

    2017-01-01

    In this paper, we analyze how pay-regime procedures affect antisocial behavior at the workplace. In a real-effort experiment we vary two determinants of pay regimes: discrimination and justification of payments by performance. In our Discrimination treatment half of the workforce is randomly selected and promoted and participate in a tournament (high-income workers) whereas the other half receives no payment (lowincome workers). Afterwards, antisocial behavior is measured by a Joy-of-Destruct...

  15. State Structure and Political Regime Structure

    Directory of Open Access Journals (Sweden)

    Paul – Iulian Nedelcu

    2012-05-01

    Full Text Available The political regime is the concrete form of organization and functioning of political system andtherefore, the regime means the concrete way of organize, institutionalize and function a political systemand of the exercise of political power by a social-political force in a social community or global socialistem. The political regime is not limited to institutions and state bodies, but it covers the entire politicalsystem. Form of expression in social practice plan is the result of balance of forces between classes ofcitizens, organizations, between them and civil society and politics.Designates the concrete form ofgovernment formation and organization, of state bodies, in aspect of their characteristics and principles, therelations between them and other state bodies, and also as the relationship between them and otherinstitutionalized forms of political systems. Instead, the political regime is an explicit realization ofaxiological operations, a specific hierarchy of values, in general and political values, in particular. Even ifsome elements of the political regime overlap to some extent and in some respects, those of form orstructure of guvernamnt state, thus they dissolve his identity, distinct quality of being specific traits of thepolitical regime.

  16. Multiple growth regimes: Insights from unified growth theory

    OpenAIRE

    Galor, Oded

    2007-01-01

    Unified Growth Theory uncovers the forces that contributed to the existence of multiple growth regimes and the emergence of convergence clubs. It suggests that differential timing of take-offs from stagnation to growth segmented economies into three fundamental regimes: slow growing economies in a Malthusian regime, fast growing countries in a sustained growth regime, and economies in the transition between these regimes. In contrast to existing research that links regime switching thresholds...

  17. Causas estruturais e consequências dos regimes internacionais: regimes como variáveis intervenientes

    OpenAIRE

    Krasner, Stephen D.

    2012-01-01

    Os regimes internacionais são definidos como princípios, normas, regras e procedimentos de tomada de decisões ao redor dos quais as expectativas dos atores convergem em uma dada área-tema. Como ponto de partida, os regimes são conceituados como variáveis intervenientes, estando entre fatores causais básicos e os resultados e comportamentos relacionados. Há três visões a respeito da importância dos regimes: as orientações estruturais convencionais desvalorizam os regimes como sendo, na melhor ...

  18. Ecosystem regime shifts disrupt trophic structure.

    Science.gov (United States)

    Hempson, Tessa N; Graham, Nicholas A J; MacNeil, M Aaron; Hoey, Andrew S; Wilson, Shaun K

    2018-01-01

    Regime shifts between alternative stable ecosystem states are becoming commonplace due to the combined effects of local stressors and global climate change. Alternative states are characterized as substantially different in form and function from pre-disturbance states, disrupting the delivery of ecosystem services and functions. On coral reefs, regime shifts are typically characterized by a change in the benthic composition from coral to macroalgal dominance. Such fundamental shifts in the benthos are anticipated to impact associated fish communities that are reliant on the reef for food and shelter, yet there is limited understanding of how regime shifts propagate through the fish community over time, relative to initial or recovery conditions. This study addresses this knowledge gap using long-term data of coral reef regime shifts and recovery on Seychelles reefs following the 1998 mass bleaching event. It shows how trophic structure of the reef fish community becomes increasingly dissimilar between alternative reef ecosystem states (regime-shifted vs. recovering) with time since disturbance. Regime-shifted reefs developed a concave trophic structure, with increased biomass in base trophic levels as herbivorous species benefitted from increased algal resources. Mid trophic level species, including specialists such as corallivores, declined with loss of coral habitat, while biomass was retained in upper trophic levels by large-bodied, generalist invertivores. Recovering reefs also experienced an initial decline in mid trophic level biomass, but moved toward a bottom-heavy pyramid shape, with a wide range of feeding groups (e.g., planktivores, corallivores, omnivores) represented at mid trophic levels. Given the importance of coral reef fishes in maintaining the ecological function of coral reef ecosystems and their associated fisheries, understanding the effects of regime shifts on these communities is essential to inform decisions that enhance ecological

  19. Estudio de validez y confiabilidad de los instrumentos evaluativos aplicados en el examen ordinario de Química

    Directory of Open Access Journals (Sweden)

    Marilyn Díaz Vázquez

    2017-04-01

    Full Text Available El perfeccionamiento del sistema de evaluación de la asignatura de Química en función de las adecuaciones del programa según el nuevo Plan D de estudio, responde a la línea de trabajo metodológico de la Escuela Latinoamericana de Medicina, “La evaluación formativa”. Es por ello que este trabajo se propone como objetivo validar la calidad de los instrumentos evaluativos aplicados en el examen ordinario de Química de la ELAM, en el curso 2015-2016. Para la investigación se utilizó el método histórico-lógico, el enfoque sistémico y el análisis estadístico. La validez se valoró mediante la consulta a los expertos y la determinación y el análisis de los índices de facilidad (IF y de discriminación (ID de los temarios utilizados en el examen ordinario de la asignatura. Para establecer la confiabilidad de los instrumentos aplicados se calculó el alfa de Cronbach. Según los valores del índice de facilidad promedio, se comprobó que en ambos temarios predominan las preguntas fáciles y adecuadas. No hay incisos difíciles y diez de ellos se consideran muy fáciles (IF>92%. El índice de discriminación promedio, arrojó que en cada temario las preguntas se consideran entre excelentes y buenas. Solo hay un total de diez incisos por debajo de los límites para revisar y uno malo, que deben ser reelaborados. Los valores del alfa de Cronbach oscilaron en un rango entre 0,6 y 0,8 para 75% de las preguntas de ambos temarios, considerándose estas confiables y solo dos preguntas deben ser reelaboradas.

  20. Progress towards a global nuclear liability regime

    International Nuclear Information System (INIS)

    2014-01-01

    During its April 2014 meeting, the Steering Committee for Nuclear Energy held a policy debate on 'Progress towards a Global Nuclear Liability Regime'. The Steering Committee heard presentations from several experts on nuclear liability issues. To prepare the delegates to the Steering Committee for the policy debate, the NEA Secretariat prepared a background note on the status of the nuclear liability regimes, as well as on current issues and challenges in implementing the regimes. This article is based on the background note and is intended to provide basic information on the relevant international conventions and an overview of recent developments to enhance the understanding of the legal framework in which policy-makers and practitioners are engaging to respond to the call for broader adherence to the international liability instruments. (authors)

  1. Determination of the Hall Thruster Operating Regimes

    International Nuclear Information System (INIS)

    L. Dorf; V. Semenov; Y. Raitses; N.J. Fisch

    2002-04-01

    A quasi one-dimensional (1-D) steady-state model of the Hall thruster is presented. For the same discharge voltage two operating regimes are possible -- with and without the anode sheath. For given mass flow rate, magnetic field profile and discharge voltage a unique solution can be constructed, assuming that the thruster operates in one of the regimes. However, we show that for a given temperature profile the applied discharge voltage uniquely determines the operating regime: for discharge voltages greater than a certain value, the sheath disappears. That result is obtained over a wide range of incoming neutral velocities, channel lengths and widths, and cathode plane locations. It is also shown that a good correlation between the quasi 1-D model and experimental results can be achieved by selecting an appropriate electron mobility and temperature profile

  2. Causas estruturais e consequências dos regimes internacionais: regimes como variáveis intervenientes

    Directory of Open Access Journals (Sweden)

    Stephen D. Krasner

    2012-06-01

    Full Text Available Os regimes internacionais são definidos como princípios, normas, regras e procedimentos de tomada de decisões ao redor dos quais as expectativas dos atores convergem em uma dada área-tema. Como ponto de partida, os regimes são conceituados como variáveis intervenientes, estando entre fatores causais básicos e os resultados e comportamentos relacionados. Há três visões a respeito da importância dos regimes: as orientações estruturais convencionais desvalorizam os regimes como sendo, na melhor das hipóteses, ineficazes; as orientações grocianas vêem os regimes como componentes íntimos do sistema internacional; as perspectivas estruturalistas modificadas vêem os regimes como significativos somente em certas condições restritas. Para os argumentos grociano e estruturalista modificado - que concordam com a visão de que os regimes podem influenciar resultados e comportamentos - , o desenvolvimento de regimes é visto como uma função de cinco variáveis causais básicas: auto-interesse egoísta; poder político; normas e princípios difusos; usos e costumes; conhecimento.

  3. Coulomb drag in the mesoscopic regime

    DEFF Research Database (Denmark)

    Mortensen, N. Asger; Flensberg, Karsten; Jauho, Antti-Pekka

    2002-01-01

    We present a theory for Coulomb drug between two mesoscopic systems which expresses the drag in terms of scattering matrices and wave functions. The formalism can be applied to both ballistic and disordered systems and the consequences can be studied either by numerical simulations or analytic...... means such as perturbation theory or random matrix theory. The physics of Coulomb drag in the mesoscopic regime is very different from Coulomb drag between extended electron systems. In the mesoscopic regime we in general find fluctuations of the drag comparable to the mean value. Examples are vanishing...

  4. Coulomb drag in the mesoscopic regime

    DEFF Research Database (Denmark)

    Mortensen, N.A.; Flensberg, Karsten; Jauho, Antti-Pekka

    2002-01-01

    We present a theory for Coulomb drag between two mesoscopic systems which expresses the drag in terms of scattering matrices and wave functions. The formalism can be applied to both ballistic and disordered systems and the consequences can be studied either by numerical simulations or analytic...... means such as perturbation theory or random matrix theory. The physics of Coulomb drag in the mesoscopic regime is very different from Coulomb drag between extended electron systems. In the mesoscopic regime we in general find fluctuations of the drag comparable to the mean value. Examples are vanishing...

  5. WELFARE REGIMES IN LATIN AMERICA AND CARIBBEAN

    Directory of Open Access Journals (Sweden)

    Melisa Campana-Alabarce

    2015-06-01

    Full Text Available This article provides a characterization of Latin American and Caribbean Welfare regimes in historiographical perspective. Firstly, it makes a review of the emergence conditions of Welfare States in Western Europe and its core features, with particular emphasis on its role as a method to regulate inequalities in industrial capitalism. Dialoguing with it, then stops in the specific configurations that welfare regimes have taken in Latin America during the course of the twentieth century. Finally, it provides a map of its contemporary features and the major challenges that the States of the region face in his capacity as right guarantors for the future.

  6. What is the New Chinese Currency Regime?

    OpenAIRE

    Shah, Ajay; Zeileis, Achim; Patnaik, Ila

    2005-01-01

    The revaluation of the yuan in July 2005 was described by the Chinese central bank as a change in the currency regime, rather than merely a changed level of the exchange rate. The reform was said to involve a shift away from the fixed exchange rate, a gradual movement towards greater flexibility, and a peg to a basket of currencies. This paper closely examines the post-July Chinese currency regime utilising contemporary ideas in the econometrics of structural change. We find that the yuan has...

  7. The oil tax regime of Azerbaijan

    Energy Technology Data Exchange (ETDEWEB)

    Anderson, Gerard

    1998-07-01

    Azerbaijan has a long history in the oil business and a chance of a spectacular future. To understand why the oil tax regime evolved into its present form and how it is likely to develop, it is necessary to know something of the country's history and the commercial environment. Consequently the presentation begins by discussing these items. It then outlines the Production Sharing Agreement regime in Azerbaijan and then deals with the Kazakh and Georgian Tax Codes, as these are likely to be the basis of a new general tax law in Azerbaijan from 1999. The presentation includes comments on the New Draft Tax Code of 1998.

  8. The oil tax regime of Azerbaijan

    Energy Technology Data Exchange (ETDEWEB)

    Anderson, Gerard

    1998-07-01

    Azerbaijan has a long history in the oil business and a chance of a spectacular future. To understand why the oil tax regime evolved into its present form and how it is likely to develop, it is necessary to know something of the country's history and the commercial environment. Consequently the presentation begins by discussing these items. It then outlines the Production Sharing Agreement regime in Azerbaijan and then deals with the Kazakh and Georgian Tax Codes, as these are likely to be the basis of a new general tax law in Azerbaijan from 1999. The presentation includes comments on the New Draft Tax Code of 1998.

  9. Regimes of flow past a vortex generator

    DEFF Research Database (Denmark)

    Velte, Clara Marika; Okulov, V.L.; Naumov, I.V.

    2012-01-01

    A complete parametric investigation of the development of multi-vortex regimes in a wake past simple vortex generator has been carried out. It is established that the vortex structure in the wake is much more complicated than a simple monopole tip vortex. The vortices were studied by stereoscopic...... particle image velocimetry (SPIV). Based on the obtained SPIV data, a map of the regimes of flow past the vortex generator has been constructed. One region with a developed stable multivortex system on this map reaches the vicinity of the optimum angle of attack of the vortex generator....

  10. Flocking regimes in a simple lattice model.

    Science.gov (United States)

    Raymond, J R; Evans, M R

    2006-03-01

    We study a one-dimensional lattice flocking model incorporating all three of the flocking criteria proposed by Reynolds [Computer Graphics 21, 4 (1987)]: alignment, centering, and separation. The model generalizes that introduced by O. J. O'Loan and M. R. Evans [J. Phys. A. 32, L99 (1999)]. We motivate the dynamical rules by microscopic sampling considerations. The model exhibits various flocking regimes: the alternating flock, the homogeneous flock, and dipole structures. We investigate these regimes numerically and within a continuum mean-field theory.

  11. Legal Regimes of Official Information in Ukraine

    Directory of Open Access Journals (Sweden)

    Serhii Yesimov

    2018-04-01

    Full Text Available In the article on the basis of the methodology of system analysis the legal nature and sources of legal regulation of the legal regime of official information in Ukraine in the conditions of adaptation of Ukrainian legislation to the legislation of the European Union are considered. A comparative legal analysis of official information in the public-law and private-law spheres in the context of legal regimes of restricted information, confidential information and information classified as state secrets has been conducted.

  12. Estabilidad para un control borroso en modo deslizante aplicado a un robot paralelo neumático

    Directory of Open Access Journals (Sweden)

    Pablo J. Prieto

    2015-10-01

    Full Text Available Resumen: Se presenta un controlador borroso tipo Mamdani basado en técnicas en modo deslizante para el posicionamiento de un robot paralelo neumático de dos grados de libertad (2 GDL. Es probado que el sistema es asintóticamente estable en el sentido de Lyapunov y se presentan resultados numéricos y experimentales. Ma's aún, el controlador diseñado puede ser aplicado en control de trayectoria al ser retroalimentadas la velocidad y la aceleración del sistema. Se presentan adema's resultados satisfactorios obtenidos en forma experimental para el caso de seguimiento de trayectoria. Abstract: In this paper is reported a Mamdani type fuzzy controller based on sliding mode techniques applied to the regulation of a 2 DOF pneumatic parallel robot. Is is proved that the system is stable in Lyapunov sense, and numerical and experimental results are reported. Moreover, the designed controller can be applied to tracking control if speed and acceleration from the system are feedbacked. Also are reported satisfactory experimental results for the tracking case. Palabras clave: Control borroso, Control de robot, Estabilidad de Lyapunov, Modos deslizantes., Keywords: Fuzzy control, Robot control, Lyapunov stability, Sliding mode.

  13. Statistics of exchange rate regimes in Nigeria | Iwueze | Global ...

    African Journals Online (AJOL)

    The three distinct exchange rate regimes of Nigeria were subjected to Autoregressive Integrated Moving Average (ARIMA) modeling in order to compare them with respect to model structure. It was found that the three regimes admit different models. Regime one admits Moving average model of order 2, Regime two admits ...

  14. Technological regimes and sources of entrepreneurship

    NARCIS (Netherlands)

    Marsili, O.

    2002-01-01

    This paper concerns the technological determinants of entrepreneurial behaviour. By applying a typology of technological regimes, which describes the nature of the technological environment in which firms operate, this paper examines the sources and obstacles to entrepreneurial entry related to the

  15. Searching for an Appropriate Exchange Rate Regime

    Directory of Open Access Journals (Sweden)

    Yunjong Wang

    2001-06-01

    Full Text Available This paper attempts to survey current debates on the choice of exchange rate regime in emerging market economies. The issue of choosing an appropriate exchange rate regime is being actively discussed since the recent Asian crisis. As a lesson from the recent crises, one widely shared conclusion is that soft peg exchange rate regimes are extremely vulnerable in a world of volatile capital movements. Consequently, new orthodoxy based on the impossible trinity hypothesis favours two corner solutions ― greater flexibility or credible institutional assurance, like a currency board system or dollarization. Nevertheless, questions whether such corner solutions are adequate for developing countries are rising of late. "Fear of floating" is still conspicuous in many developing countries having adopted nominally a free-floating exchange rate regime. Developing countries are sensitive to exchange rate fluctuations because the cost of exchange rate volatility is greater than the benefit when compared to developed countries. Monitoring bands is a compromise solution, but it still needs further enhancement of estimation techniques for fundamental equilibrium exchange rates in order to make those estimation results more workable in practice. Other alternatives include the creation of soft peg of the G-3 currencies. Despite counterarguments, the stability of G-3 currencies could prove to be beneficial to emerging market economies.

  16. Negotiating a regime to control global warming

    International Nuclear Information System (INIS)

    Sebenius, J.K.

    1991-01-01

    For purposes of analysis, this paper has uncritically maintained that the prospect of a serious climate problem exists and has only lightly examined the broader advantages and drawbacks of various proposed policy and institutional responses. Crucial as they are to a full treatment of the issues, these underlying substantive and policy questions enter the analysis primarily insofar as they affect the likely outcomes of pending and potential negotiations. To an advocate of a new greenhouse control regime, the fundamental negotiating task is to craft and sustain a meaningful winning coalition of countries backing such a regime. Two centrally necessary conditions for the fundamental task are: (1) that each member of the coalition see enough gain in the regime relative to the alternatives to adhere and (2) the potential and actual blocking coalitions of interests opposed to the regime be prevented from forming and from being acceptably accommodated or otherwise neutralized. The analysis of this paper is organized around key questions whose answers will influence whether and how these two necessary conditions might (or might not) be met

  17. Yukon's common oil and gas regime

    International Nuclear Information System (INIS)

    Love, B.

    1998-01-01

    The Yukon's common oil and gas regime was developed in partnership with First Nations and it sets out the rules that will apply throughout the Yukon and on Yukon and First Nation lands. While separate and distinct, it conforms with and is compatible with other government systems and regimes. The major elements of the common regime include the Oil and Gas Act, regulations, policies, processes and agreements. The specific opportunities that are available in each phase of oil and gas development in the Yukon are described, with a map showing all basins, reserves and sites of current oil and gas activity. The Yukon has eight potential oil and gas basins: North Coast, Old Crow, Kandik, Eagle Plain, Peel Plateau, Bonnet Plume, Whitehorse Trough, and Liard Plateau. Only three of the eight, the Liard Plateau, Whitehorse Trough and Eagle Plain, have been explored. No wells have been drilled in several of Yukon's basins. Factors influencing economic opportunities in the Territory are also described, including: (1) international events and energy markets, (2) North American gas markets, (3) environmental factors, (4) competitiveness of the Yukon regime, and (5) the commitment of industry resources. 4 figs

  18. Technological regimes and sources of entrepreneurship

    NARCIS (Netherlands)

    Marsili, O.

    2000-01-01

    This paper concerns the technological detenninants of entrepreneurial behaviour. By applying a typology of technological regimes, which describes the nature of the technological environment in which finns operate, this paper examines the sources and obstacle to entrepreneurial entry related to the

  19. Comprehensive review of the maritime safety regimes.

    NARCIS (Netherlands)

    S. Knapp (Sabine); Ph.H.B.F. Franses (Philip Hans)

    2007-01-01

    textabstractThis report presents a comprehensive review of the maritime safety regimes and provides recommendations on how to improve the system. The results show a complex legal framework which generates a high amount of inspections and overlapping of inspection areas where no cross-recognition is

  20. Plugging regime in the pump limiter throat

    International Nuclear Information System (INIS)

    Ghendrih, P.; Grosman, A.; Samain, A.; Capes, H.; Morera, J.P.

    1988-08-01

    The plugging regime -with no outstreaming neutral flux- is studied for a closed configuration pump limiter (throat). We derive the plugging length and the neutral density build-up at the neutralizer plate. The analytical expressions are supported by numerical evidence. We find an improved efficiency related to the throat effect mainly due to neutral-sidewall interactions

  1. Early detection of ecosystem regime shifts

    DEFF Research Database (Denmark)

    Lindegren, Martin; Dakos, Vasilis; Groeger, Joachim P.

    2012-01-01

    methods may have limited utility in ecosystem-based management as they show no or weak potential for early-warning. We therefore propose a multiple method approach for early detection of ecosystem regime shifts in monitoring data that may be useful in informing timely management actions in the face...

  2. European welfare regimes: Political orientations versus poverty

    Directory of Open Access Journals (Sweden)

    Josifidis Kosta

    2011-01-01

    Full Text Available This inquiry analyzes how political orientations shape welfare states and labour market institutions when seeking to reduce poverty. In order to identify effects of these two key variables, we conduct a panel regression analysis that includes two poverty measures: poverty rates before and after social spending. This inquiry considers 14 EU countries, and in the period from 1995 to 2008, which are grouped according to welfare state regimes. We consider Social Democratic, Corporatist, Mediterranean and Liberal welfare state regimes. Panel regression results indicate that political orientation engenders no significant statistically measurable effects on poverty rates before social spending. Effects register, however, as significant when considering poverty rates after social spending. With respect to the first set of results, we advance two key explanations. First, we note a longer period of time is necessary in order to observe actual effects of political orientation on market generated poverty. Second, political parties with their respective programs do not register as influential enough to solve social problems related to income distribution when taken alone. Influences register as indirect and are expressed through changes in employment rates and social spending. The second set of results support the hypothesis that a selected political regime does indeed contribute to poverty reduction. In sum, political orientation and political regime does indeed affect poverty through welfare state institutions, as well as through labour market institutions.

  3. Radiative effects of global MODIS cloud regimes

    Science.gov (United States)

    Oreopoulos, Lazaros; Cho, Nayeong; Lee, Dongmin; Kato, Seiji

    2018-01-01

    We update previously published MODIS global cloud regimes (CRs) using the latest MODIS cloud retrievals in the Collection 6 dataset. We implement a slightly different derivation method, investigate the composition of the regimes, and then proceed to examine several aspects of CR radiative appearance with the aid of various radiative flux datasets. Our results clearly show the CRs are radiatively distinct in terms of shortwave, longwave and their combined (total) cloud radiative effect. We show that we can clearly distinguish regimes based on whether they radiatively cool or warm the atmosphere, and thanks to radiative heating profiles to discern the vertical distribution of cooling and warming. Terra and Aqua comparisons provide information about the degree to which morning and afternoon occurrences of regimes affect the symmetry of CR radiative contribution. We examine how the radiative discrepancies among multiple irradiance datasets suffering from imperfect spatiotemporal matching depend on CR, and whether they are therefore related to the complexity of cloud structure, its interpretation by different observational systems, and its subsequent representation in radiative transfer calculations. PMID:29619289

  4. Radiative Effects of Global MODIS Cloud Regimes

    Science.gov (United States)

    Oraiopoulos, Lazaros; Cho, Nayeong; Lee, Dong Min; Kato, Seiji

    2016-01-01

    We update previously published MODIS global cloud regimes (CRs) using the latest MODIS cloud retrievals in the Collection 6 dataset. We implement a slightly different derivation method, investigate the composition of the regimes, and then proceed to examine several aspects of CR radiative appearance with the aid of various radiative flux datasets. Our results clearly show the CRs are radiatively distinct in terms of shortwave, longwave and their combined (total) cloud radiative effect. We show that we can clearly distinguish regimes based on whether they radiatively cool or warm the atmosphere, and thanks to radiative heating profiles to discern the vertical distribution of cooling and warming. Terra and Aqua comparisons provide information about the degree to which morning and afternoon occurrences of regimes affect the symmetry of CR radiative contribution. We examine how the radiative discrepancies among multiple irradiance datasets suffering from imperfect spatiotemporal matching depend on CR, and whether they are therefore related to the complexity of cloud structure, its interpretation by different observational systems, and its subsequent representation in radiative transfer calculations.

  5. The Forex Regime and EMU Expansion

    NARCIS (Netherlands)

    P.W. van Foreest; C.G. de Vries (Casper)

    2002-01-01

    textabstractThis paper provides empirical evidence that, irrespective of the foreign exchange rate regime, countries with high monetary volatility have lower relative output growth rates. It is argued that due to the forward looking nature of the foreign exchange market, exchange rate stability

  6. Trust in regulatory regimes: scoping the field

    NARCIS (Netherlands)

    Six, F.E.; Verhoest, Koen

    2017-01-01

    This edited volume is the first endeavour to systematically investigate the role of trust in the different relations within regulatory regimes. Trust as a multifaceted concept is contested within public administration and political science in general and especially within the relation between

  7. Optimal dividend distribution under Markov regime switching

    NARCIS (Netherlands)

    Jiang, Z.; Pistorius, M.

    2012-01-01

    We investigate the problem of optimal dividend distribution for a company in the presence of regime shifts. We consider a company whose cumulative net revenues evolve as a Brownian motion with positive drift that is modulated by a finite state Markov chain, and model the discount rate as a

  8. A Comparative Typology of Pension Regimes

    NARCIS (Netherlands)

    Arjan Soede; Cok Vrooman

    2008-01-01

    This report presents an empirical typology of pension regimes in the European Union, the US, Canada, Australia and Norway. The categorisation is based on 34 quantitative and qualitative characteristics of the mandatory parts of the pension systems in these countries. The empirical analysis shows

  9. Regime Shifts and Resilience in Fisheries Management

    NARCIS (Netherlands)

    Li, Chuan Zhong; Villasante, Sebastian; Zhu, Xueqin

    2016-01-01

    We investigate the role of potential regime shifts in Argentinean hake fishery and the inter-linkage between ecological and economic resilience. We develop a theoretical model incorporated with the hazard function for resource management under alternative conditions, and derive the corrective

  10. An emissions trading regime for Canada

    International Nuclear Information System (INIS)

    Smith, S.L.

    2001-01-01

    In 1998, over twelve papers were published on emissions trading regimes in Canada by the National Round Table on the Environment and the Economy (NRTEE), a federal government agency whose members represent stakeholders as varied as business, environmental groups, academics, aboriginal groups and others. One of the recommendations that emerged was for the computer modelling of the possibilities that had been identified for a domestic trading regime in Canada for greenhouse gases. It is unclear whether the modelling was ever performed as the file was taken over by the Finance Department under the umbrella of a special emission trading table that examined Canada's commitment under the Kyoto Protocol. The author examined questions pertaining to whether a domestic trading regime is essential, and what its characteristics should be in case it was deemed essential or advisable to have one. The upstream versus downstream application was looked at, as well as grand-fathering versus auction. Provincial issues were then addressed, followed by meshing with a credit system. International systems were reviewed. Early action was discussed, whereby an emitter seeks credit for action taken toward reductions since the original reference year of 1990. The case of emitters having bought or sold permits since the original reference years will also want those trades recognized under a trading regime. The author indicated that it seems probable that an emission trading system will eventually be implemented and that a debate on the issue should be initiated early

  11. EUROPEAN INFLUENCE ON ETHIOPIAN ANTITRUST REGIME:

    African Journals Online (AJOL)

    eliasn

    Introduction. Despite a noticeable European influence on the Ethiopian competition legal regime, some aspects of Ethiopia's 2003 Trade Practice Proclamation are still inadequate to appropriately deal with certain competition problems. The limitations of the rules need to be put right since achievement of the very goals of ...

  12. [The "specific" liability regime for blood products].

    Science.gov (United States)

    Byk, Christian

    2017-10-13

    Based on the system of liability for defective products as organized by the European Directive of 25 July 1985, responsibility for blood products does not therefore constitute a genuine specific regime. However, European law leaves States a margin of discretion in the implementation of the Directive with regard to health products. This is the case in particular with the exemption for development risk.

  13. Water regime of steam power plants

    International Nuclear Information System (INIS)

    Oesz, Janos

    2011-01-01

    The water regime of water-steam thermal power plants (secondary side of pressurized water reactors (PWR); fossil-fired thermal power plants - referred to as steam power plants) has changed in the past 30 years, due to a shift from water chemistry to water regime approach. The article summarizes measures (that have been realised by chemists of NPP Paks) on which the secondary side of NPP Paks has become a high purity water-steam power plant and by which the water chemistry stress corrosion risk of heat transfer tubes in the VVER-440 steam generators was minimized. The measures can also be applied to the water regime of fossil-fired thermal power plants with super- and subcritical steam pressure. Based on the reliability analogue of PWR steam generators, water regime can be defined as the harmony of construction, material(s) and water chemistry, which needs to be provided in not only the steam generators (boiler) but in each heat exchanger of steam power plant: - Construction determines the processes of flow, heat and mass transfer and their local inequalities; - Material(s) determines the minimal rate of general corrosion and the sensitivity for local corrosion damage; - Water chemistry influences the general corrosion of material(s) and the corrosion products transport, as well as the formation of local corrosion environment. (orig.)

  14. Modelos aplicados às atividades de educação em saúde Modelos aplicados a las actividades de educación en salud Models applied to the activities of health education

    Directory of Open Access Journals (Sweden)

    Maria Fernanda Santos Figueiredo

    2010-02-01

    Full Text Available Este estudo objetivou compreender quais os modelos educacionais têm sido aplicados às atividades de educação em saúde. Trata-se de uma revisão de literatura, sobre o tema “Modelos de Educação” e “Educação em Saúde”, utilizando como referenciais livros-textos contemporâneos de especialistas da área de educação e periódicos sobre tais temas, disponíveis nas principais bases de dados. Os resultados revelaram que o Modelo Tradicional de educação em saúde objetiva transmissão do conhecimento e experiência do educador, atribuindo uma importância suprema ao conteúdo ensinado, esperando que os educandos o absorvam sem modificações e o reproduzam fielmente. Já, o modelo dialógico compreende a educação em saúde como um processo de conscientização, mudança e transformação, caracterizada por uma filosofia emancipatória dos sujeitos.Este estudio tuvo como objetivo determinar modelos educativos que se han aplicado a las actividades de educación en salud. Es una revisión de la literatura sobre el tema “Modelos de Educación”, “Educación para la Salud”, utilizando como referencia libros contemporáneos, revistas sobre temas tales disponible en las principales bases de datos. Resultados mostraron que Modelo Tradicional de educación para la salud tiene por objeto transferencia de experiências, conocimientos de al educador, lo que da una importancia primordial a los contenidos enseñados, con esperanza de que estudiantes absorber la misma, la reproducción fiel. Modelo basado en el diálogo entiende la educación para la salud como proceso de sensibilización, el cambio, la transformación, que se caracteriza por una filosofía del sujeto emancipatorio.This study aimed at determining which educational models have been applied to the activities health education. This is a review of literature on the topic “Models of Education” and “Health Education”, using as reference contemporary books of

  15. The global safety regime - Setting the stage

    International Nuclear Information System (INIS)

    Meserve, R.A.

    2005-01-01

    The existing global safety regime has arisen from the exercise of sovereign authority, with an overlay of voluntary international cooperation from a network of international and regional organizations and intergovernmental agreements. This system has, in the main, served us well. For several reasons, the time is ripe to consider the desired shape of a future global safety regime and to take steps to achieve it. First, every nation's reliance on nuclear power is hostage to some extent to safety performance elsewhere in the world because of the effects on public attitudes and hence there is an interest in ensuring achievement of common standards. Second, the world is increasingly interdependent and the vendors of nuclear power plants seek to market their products throughout the globe. Efficiency would arise from the avoidance of needless differences in approach that require custom modifications from country to country. Finally, we have much to learn from each other and a common effort would strengthen us all. Such an effort might also serve to enhance public confidence. Some possible characteristics of such a regime can be identified. The regime should reflect a global consensus on the level of safety that should be achieved. There should be sufficient standardization of approach so that expertise and equipment can be used everywhere without significant modification. There should be efforts to ensure a fundamental commitment to safety and the encouragement of a safety culture. And there should be efforts to adopt more widely the best regulatory practices, recognizing that some modifications in approach may be necessary to reflect each nation's legal and social culture. At the same type, the regime should have the characteristics of flexibility, transparency, stability, practicality, and encouragement of competence. (author)

  16. Dune growth under multidirectional wind regimes

    Science.gov (United States)

    Gadal, C.; Rozier, O.; Claudin, P.; Courrech Du Pont, S.; Narteau, C.

    2017-12-01

    Under unidirectional wind regimes, flat sand beds become unstable to produce periodic linear dunes, commonly called transverse dunes because their main ridges are oriented perpendicular to the air flow. In areas of low sediment availability, the same interactions between flow, transport and topography produce barchan dunes, isolated sand-pile migrating over long distances with a characteristic crescentic shape. For the last fifteen years, barchan dunes and the instability at the origin of transverse dunes have been the subject of numerous studies that have identified a set of characteristic length and time scales with respect to the physical properties of both grains and fluid. This is not the case for dunes developing under multidirectional wind regimes. Under these conditions, dune orientation is measured with respect to the direction of the resultant sand flux. Depending on the wind regime, dunes do not always line up perpendicularly to the resultant sand flux, but can also be at an oblique angle or even parallel to it. These oblique and longitudinal dunes are ubiquitous in all deserts on Earth and planetary bodies because of the seasonal variability of wind orientation. They are however poorly constrained by observations and there is still no complete theoretical framework providing a description of their orientation and initial wavelength. Here, we extend the linear stability analysis of a flat sand of bed done in two dimensions for a unidirectional flow to three dimensions and multidirectional flow regimes. We are able to recover transitions from transverse to oblique or longitudinal dune patterns according to changes in wind regimes. We besides give a prediction for the initial dune wavelength. Our results compare well to previous theory of dune orientation and to field, experimental and numerical data.

  17. Desempenho do cafeeiro Icatu vermelho sob ação de biorregulador aplicado em fases reprodutivas da cultura

    Directory of Open Access Journals (Sweden)

    Nídia Raquel Costa

    2010-08-01

    Full Text Available Com o objetivo de avaliar o efeito do biorregulador Stimulate® aplicado em diferentes fases da cultura do cafeeiro durante seu ciclo reprodutivo, foi instalado o experimento em uma propriedade comercial localizada no município de Garça - SP, com plantio de café da variedade Icatu vermelho, com idade de 4 anos e espaçamento 4 x 2 m. O delineamento experimental foi o de blocos ao acaso, com 4 repetições, 10 plantas por parcela e 13 tratamentos. Foram marcados 4 ramos plagiotrópicos, de maneira aleatória em 5 plantas, no terço mediano das mesmas, para se proceder as avaliações desejáveis, desde o florescimento até a colheita do café. A aplicação de Stimulate® via foliar durante diferentes fases fenológicas do desenvolvimento reprodutivo do cafeeiro foi promissor para elevar parâmetros qualitativos e quantitativos, como porcentagem de pegamento de frutos após o florescimento, garantindo maior fixação até seu completo desenvolvimento; maior produção de nós nos ramos plagiotrópicos; maior crescimento de frutos e sementes; elevação da produtividade da cultura, além de alterar a maturação dos frutos, acelerando este processo com possibilidade de antecipação da colheita, com maior proporção de frutos tipo cereja, ideal para proporcionar melhor qualidade do café.

  18. MULTIOBJECTIVE EVOLUTIONARY ALGORITHMS APPLIED TO MICROSTRIP ANTENNAS DESIGN ALGORITMOS EVOLUTIVOS MULTIOBJETIVO APLICADOS A LOS PROYECTOS DE ANTENAS MICROSTRIP

    Directory of Open Access Journals (Sweden)

    Juliano Rodrigues Brianeze

    2009-12-01

    Full Text Available This work presents three of the main evolutionary algorithms: Genetic Algorithm, Evolution Strategy and Evolutionary Programming, applied to microstrip antennas design. Efficiency tests were performed, considering the analysis of key physical and geometrical parameters, evolution type, numerical random generators effects, evolution operators and selection criteria. These algorithms were validated through design of microstrip antennas based on the Resonant Cavity Method, and allow multiobjective optimizations, considering bandwidth, standing wave ratio and relative material permittivity. The optimal results obtained with these optimization processes, were confirmed by CST Microwave Studio commercial package.Este trabajo presenta tres de los principales algoritmos evolutivos: Algoritmo Genético, Estrategia Evolutiva y Programación Evolutiva, aplicados al diseño de antenas de microlíneas (microstrip. Se realizaron pruebas de eficiencia de los algoritmos, considerando el análisis de los parámetros físicos y geométricos, tipo de evolución, efecto de generación de números aleatorios, operadores evolutivos y los criterios de selección. Estos algoritmos fueron validados a través del diseño de antenas de microlíneas basado en el Método de Cavidades Resonantes y permiten optimizaciones multiobjetivo, considerando ancho de banda, razón de onda estacionaria y permitividad relativa del dieléctrico. Los resultados óptimos obtenidos fueron confirmados a través del software comercial CST Microwave Studio.

  19. Filmes de polipirrol aplicados no desenvolvimento de eletrodos descartáveis seletivos a íons fluoreto

    Directory of Open Access Journals (Sweden)

    Alyne Cristina Lamy-Mendes

    2014-08-01

    Full Text Available O presente manuscrito descreve o desenvolvimento de um sensor descartável sensível e seletivo baseado em filmes de polipirrol dopados (PPy para determinação íons fluoreto. Os íons fluoretos foram incorporados na matriz PPy durante a polimerização eletroquímica realizada em condições galvanostáticas em um eletrodo compósito etileno vinil acetato e negro de fumo. Parâmetros experimentais envolvidos na preparação de película PPy tais como densidade de corrente elétrica, carga elétrica, o pH e a concentração de eletrólito foram otimizados de forma a maximizar a resposta potenciométrica. A resposta do sensor para íons de flúor foi linear no intervalo de concentração de 1,00 × 10- 5 a 1,08 × 10- 2 mol L- 1, com uma inclinação de ~ 40 mV / pF e foi estável suficiente para várias determinações. O método foi aplicado com sucesso na determinação de íons fluoreto em amostras comerciais farmacêuticas. Os resultados demonstraram que o sensor proposto pode ser utilizado como uma alternativa interessante aos métodos analíticos tradicionais para determinação de íons fluoreto.

  20. Caracterización superficial de nuevos pre-tratamientos a base de silanos aplicados sobre aluminio

    Directory of Open Access Journals (Sweden)

    Gener, M.

    2005-12-01

    Full Text Available Silane- based pre-treatments are an alternative process for the chrome-based corrosionpreventive commercial pre-treatments, without salubrity problems and that in initial exploratory studies have yielded promising results regarding corrosion protection and adhesion promotion. In the framework of the research about the anticorrosive capacity of these compounds that it's being undertaken for different silane and substrates, some preliminary results are presented in this paper. Specifically, the results of the surface characterisation through SEM-EDS (Scanning Electron Microscopy and XPS (X-Ray Photoelectron Spectroscopy for two silanes with different functional groups (3-aminopropyltriethoxysilane or γ-APS and 3-glycidyloxypropyltrimethoxysilane or γ-GPS, prepared at different pH and applied as primers on an aluminium substrate, are discussed.

    Un proceso alternativo a los pre-tratamientos comerciales anticorrosivos a base de cromo, sin problemas de salubridad y que en estudios exploratorios iniciales ha dado resultados prometedores en cuanto a la protección frente a la corrosión y la mejora de la adherencia, son los pre-tratamientos a base de silanos. En el marco de la investigación sobre la capacidad anticorrosiva de estos compuestos que se está realizando para diferentes silanos y substratos, se presentan en este artículo algunos de los resultados preliminares. En concreto, se discuten los resultados de la caracterización superficial mediante técnicas de SEM-EDS (Scanning Electron Microscopy y XPS (X-Ray Photoelectron Spectroscopy para dos silanos con distintos grupos funcionales (3-aminopropiltrietoxisilano o γ-APS y 3-glicidiloxipropiltrimetoxisilano o γ-GPS, preparados a distintos pH y aplicados como imprimación sobre un substrato de aluminio.

  1. Análise comparativa de classificadores digitais em imagens do Landsat-8 aplicados ao mapeamento temático

    Directory of Open Access Journals (Sweden)

    Danilo Francisco Trovo Garofalo

    2015-07-01

    Full Text Available Resumo: O objetivo deste trabalho foi avaliar o desempenho dos classificadores digitais SVM e K-NN para a classificação orientada a objeto em imagens Landsat-8, aplicados ao mapeamento de uso e cobertura do solo da Alta Bacia do Rio Piracicaba-Jaguari, MG. A etapa de pré-processamento contou com a conversão radiométrica e a minimização dos efeitos atmosféricos. Em seguida, foi feita a fusão das bandas multiespectrais (30 m com a banda pancromática (15 m. Com base em composições RGB e inspeções de campo, definiram-se 15 classes de uso e cobertura do solo. Para a segmentação de bordas, aplicaram-se os limiares 10 e 60 para as configurações de segmentação e união no aplicativo ENVI. A classificação foi feita usando SVM e K-NN. Ambos os classificadores apresentaram elevados valores de índice Kappa (k: 0,92 para SVM e 0,86 para K-NN, significativamente diferentes entre si a 95% de probabilidade. Uma significativa melhoria foi observada para SVM, na classificação correta de diferentes tipologias florestais. A classificação orientada a objetos é amplamente aplicada em imagens de alta resolução espacial; no entanto, os resultados obtidos no presente trabalho mostram a robustez do método também para imagens de média resolução espacial.

  2. Choice of exchange rate regimes for African countries: Fixed or Flexible Exchange rate regimes?

    OpenAIRE

    Simwaka, Kisu

    2010-01-01

    The choice of an appropriate exchange rate regime has been a subject of ongoing debate in international economics. The majority of African countries are small open economies and thus where the choice of the exchange rate regime is an important policy issue. Aside from factors such as interest rates and inflation, the exchange rate is one of the most important determinants of a country’s relative level of economic health. For this reason, exchange rates are among the most watched analyzed and ...

  3. Steady and transient regimes in hydropower plants

    Science.gov (United States)

    Gajic, A.

    2013-12-01

    Hydropower plant that has been in operation for about 30 years has to be reconstructed. They have already installed 12 Kaplan turbines, the largest in the world at that time. The existing CAM relationship was determined based on hydraulic model tests and checked by efficiency on-site tests. It was also tested based on turbine bearing vibrations. In order to discover vibrations and long cracks on stay vanes detailed on-site measurements were performed. Influence of the modification of the trailing edges on the dynamic stresses of the stay vanes is also shown. In order to improve power output transient regimes were analyzed, both experimentally and numerically. Reversible hydropower plant, a pioneer in Europe since it was the first Pump storage power plant constructed with the highest head pump-turbines in the world. Analyses of transient regimes discover some problems with S-shaped characteristics coupled with non-symmetrical penstock.

  4. Steady and transient regimes in hydropower plants

    International Nuclear Information System (INIS)

    Gajic, A

    2013-01-01

    Hydropower plant that has been in operation for about 30 years has to be reconstructed. They have already installed 12 Kaplan turbines, the largest in the world at that time. The existing CAM relationship was determined based on hydraulic model tests and checked by efficiency on-site tests. It was also tested based on turbine bearing vibrations. In order to discover vibrations and long cracks on stay vanes detailed on-site measurements were performed. Influence of the modification of the trailing edges on the dynamic stresses of the stay vanes is also shown. In order to improve power output transient regimes were analyzed, both experimentally and numerically. Reversible hydropower plant, a pioneer in Europe since it was the first Pump storage power plant constructed with the highest head pump-turbines in the world. Analyses of transient regimes discover some problems with S-shaped characteristics coupled with non-symmetrical penstock

  5. Recent Activities on Global Nuclear Safety Regime

    International Nuclear Information System (INIS)

    Cho, Kun-Woo; Park, Jeong-Seop; Kim, Do-Hyoung

    2006-01-01

    Recently, rapid progress on the globalization of the nuclear safety issues is being made in IAEA (International Atomic Energy Agency) and its member states. With the globalization, the need for international cooperation among international bodies and member states continues to grow for resolving these universal nuclear safety issues. Furthermore, the importance of strengthening the global nuclear safety regime is emphasized through various means, such as efforts in application of IAEA safety standards to all nuclear installations in the world and in strengthening the code of conduct and the convention on nuclear safety. In this regards, it is important for us to keep up with the activities related with the global nuclear safety regime as an IAEA member state and a leading country in nuclear safety regulation

  6. Regimes de espaço

    Directory of Open Access Journals (Sweden)

    Eric Landowski

    2015-06-01

    Full Text Available Space Regimes - Based on a general model of interaction, the present analysis attempts to account for the diversity of the ways space may be apprehended in lived experience. It leads to the definition of four configurations that correspond to as many regimes of relation with the environing world. The conventional space of the circulation of values takes the archetypical shape of the net (incarnated today by Internet. The operational space is that of our dealing with objects within a material environment seen as a tissue of stable and intelligible relations. The experienced space of bodies’ movement, to which one may give as an emblem the spiral, expresses the dynamics of sensitive relationships between the self and the other. The existential space is that of our presence in a universe without boundaries, which no one can properly represent oneself but that nonetheless haunts art and thought: its figure is the abyss.

  7. Supersonic free jet, molecular free regime

    International Nuclear Information System (INIS)

    Sanna, G.; Tomassetti, G.

    1999-01-01

    The structure of the free jet emitted by a converging nozzle as obtained by the method of characteristics by Ashkenas and Sherman is described in details. In particular the dependence of the field variable by the distance from the nozzle is given. The transition from continuum to molecular free regime is then considered and the sudden freeze approximation is introduced. The processing of monoatomic and polyatomic gasses is also considered [it

  8. Dynamic Regime of Ignition of Solid Propellant

    Directory of Open Access Journals (Sweden)

    Zolotorev Nikolay

    2016-01-01

    Full Text Available This article presents a dynamic regime of exposure of the radiant flux on the sample of gun-cotton. Obtained time the ignition of gun-cotton in the heating conditions of increasing heat flux in the range from 0.2 W/cm2 to 22 W/cm2. A comparison of the delay times of the ignition when heated variable and constant heat flux.

  9. Resource Windfalls, Political Regimes, and Political Stability

    OpenAIRE

    Francesco Caselli; Andrea Tesei

    2011-01-01

    We study theoretically and empirically whether natural resource windfalls affect political regimes. We document the following regularities. Natural resource windfalls have no effect on the political system when they occur in democracies. However, windfalls have significant political consequences in autocracies. In particular, when an autocratic country receives a positive shock to its flow of resource rents it responds by becoming even more autocratic. Furthermore, there is heterogeneity in t...

  10. Deuteron structure in the deep inelastic regime

    Energy Technology Data Exchange (ETDEWEB)

    Garcia Canal, C.A.; Tarutina, T. [Universidad Nacional de La Plata, IFLP/CONICET y Departamento de Fisica, La Plata (Argentina); Vento, V. [Universidad de Valencia-CSIC, Departamento de Fisica Teorica-IFIC, Burjassot (Valencia) (Spain)

    2017-06-15

    We study nuclear effects in the deuteron in the deep inelastic regime using the newest available data. We put special emphasis on their Q{sup 2} dependence. The study is carried out using a scheme which parameterizes, in a simple manner, these effects by changing the proton and neutron stucture functions in medium. The result of our analysis is compared with other recent proposals. We conclude that precise EMC ratios cannot be obtained without considering the nuclear effects in the deuteron. (orig.)

  11. Proliferation Control Regimes: Background and Status

    Science.gov (United States)

    2012-10-25

    States has signed such agreements with Antigua and Barbuda, the Bahamas, Belize, Croatia, Cyprus, Liberia, Malta, the Marshall Islands , Mongolia...Chemical Weapons Convention (CWC), the Biological and Toxin Weapons Convention (BWC), and the Australia Group. The informal Australia Group...biological agents or toxins “of types and in quantities that have no justification for peaceful purposes.” The missile nonproliferation regime is founded not

  12. A regime legitimacy explanation of African peacekeeping

    OpenAIRE

    Ross, Matthew.

    2011-01-01

    Approved for public release; distribution is unlimited. The American military needs to understand what incentivizes some African nations to participate in peacekeeping in order to strengthen the incentive structure so that high levels of peacekeeping will continue. The main argument advanced in this thesis is that regimes that are attempting to increase their structural legitimacy are more likely to volunteer for peacekeeping missions to gain international political legitimacy, as well as ...

  13. Symmetric vs. asymmetric punishment regimes for bribery

    OpenAIRE

    Engel, Christoph; Goerg, Sebastian J.; Yu, Gaoneng

    2012-01-01

    In major legal orders such as UK, the U.S., Germany, and France, bribers and recipients face equally severe criminal sanctions. In contrast, countries like China, Russia, and Japan treat the briber more mildly. Given these differences between symmetric and asymmetric punishment regimes for bribery, one may wonder which punishment strategy is more effective in curbing corruption. For this purpose, we designed and ran a lab experiment in Bonn (Germany) and Shanghai (China) with exactly the same...

  14. ACCESSORIES OF FISCAL OBLIGATION. LEGAL REGIME

    Directory of Open Access Journals (Sweden)

    RADA POSTOLACHE

    2012-05-01

    Full Text Available The interest – which is an institution typical to private law, has been taken over by the fiscal field and adapted to the specific features of fiscal obligation – being defined by its imperative legal regime, which has at the least the following characteristic elements: unitary character, imposed legal percentage, compulsory demand of interest, automatic application. In order to render responsible fiscal debtors, the lawmaker has reintroduced, as an accessory of fiscal obligation, delayed payment penalties, which have a distinct nature and legal regime, but without the principle non bis in idem being transgressed. Our study aims to establish the legal regime ofaccessories typical to fiscal obligation, from the perspective of special normative acts, but also of the common law within the field – Civil Code and Government Ordinance No. 13/2011 – by pointing out at the same time both the particular circumstances and procedural ones regulated by the Fiscal Procedure Code, shedding light upon the controversial legal nature of accessories.

  15. "International regime for advancing lunar development"

    Science.gov (United States)

    Beldavs, VZ

    2017-09-01

    A specific concern regarding the Moon Treaty is the provision for sharing the wealth gained from space with developing countries that have not invested and taken risks in making possible space materials utilization. Article 11, par. 7 states "The main purposes of the international regime to be established shall include: (a) The orderly and safe development of the natural resources of the moon; (b) The rational management of those resources; (c) The expansion of opportunities in the use of those resources; (d) An equitable sharing by all States Parties in the benefits derived from those resources, whereby the interests and needs of the developing countries, as well as the efforts of those countries which have contributed either directly or indirectly to the exploration of the moon, shall be given special consideration." Whether the Moon Treaty in its present form or modified to be acceptable to more parties or the Moon Treaty is ignored, the language of Article 11, paragraph 7 can be used to construct an international regime for lunar development that can meet the requirements of commercial business as well as of states that provide support for lunar development as well as developing countries that may have played a modest role in making lunar development possible. This paper will consider options for constructing an international regime for lunar development.

  16. Detecting spatial regimes in ecosystems | Science Inventory ...

    Science.gov (United States)

    Research on early warning indicators has generally focused on assessing temporal transitions with limited application of these methods to detecting spatial regimes. Traditional spatial boundary detection procedures that result in ecoregion maps are typically based on ecological potential (i.e. potential vegetation), and often fail to account for ongoing changes due to stressors such as land use change and climate change and their effects on plant and animal communities. We use Fisher information, an information theory based method, on both terrestrial and aquatic animal data (US Breeding Bird Survey and marine zooplankton) to identify ecological boundaries, and compare our results to traditional early warning indicators, conventional ecoregion maps, and multivariate analysis such as nMDS (non-metric Multidimensional Scaling) and cluster analysis. We successfully detect spatial regimes and transitions in both terrestrial and aquatic systems using Fisher information. Furthermore, Fisher information provided explicit spatial information about community change that is absent from other multivariate approaches. Our results suggest that defining spatial regimes based on animal communities may better reflect ecological reality than do traditional ecoregion maps, especially in our current era of rapid and unpredictable ecological change. Use an information theory based method to identify ecological boundaries and compare our results to traditional early warning

  17. QCD in the {delta}-regime

    Energy Technology Data Exchange (ETDEWEB)

    Bietenholz, W. [Universidad Nacional Autonoma de Mexico, Mexico City (Mexico). Inst. de Ciencias Nucleares; Cundy, N. [Seoul National Univ. (Korea, Republic of). Lattice Gauge Theory Research Center; Goeckeler, M. [Regensburg Univ. (Germany). Inst. fuer Theoretische Physik; Horsley, R.; Zanotti, J.M. [Edinburgh Univ. (United Kingdom). School of Physics; Nakamura, Y. [Tsukuba Univ., Ibaraki (Japan). Center for Computational Sciences; Pleiter, D. [Deutsches Elektronen-Synchrotron (DESY), Zeuthen (Germany); Rakow, P.E.L. [Liverpool Univ. (United Kingdom). Theoretical Physics Div.; Schierholz, G. [Regensburg Univ. (Germany). Inst. fuer Theoretische Physik; Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)

    2011-03-15

    The {delta}-regime of QCD is characterised by light quarks in a small spatial box, but a large extent in (Euclidean) time. In this setting a specific variant of chiral perturbation theory - the {delta}-expansion - applies, based on a quantum mechanical treatment of the quasi onedimensional system. In particular, for vanishing quark masses one obtains a residual pion mass M{sup R}{sub {pi}}, which has been computed to the third order in the {delta}-expansion. A comparison with numerical measurements of this residual mass allows for a new determination of some Low Energy Constants, which appear in the chiral Lagrangian. We first review the attempts to simulate 2-flavour QCD directly in the {delta}-regime. This is very tedious, but results compatible with the predictions for M{sup R}{sub {pi}} have been obtained. Then we show that an extrapolation of pion masses measured in a larger volume towards the {delta}-regime leads to good agreement with the theoretical predictions. From those results, we also extract a value for the (controversial) sub-leading Low Energy Constant anti l{sub 3}. (orig.)

  18. QCD in the δ-regime

    International Nuclear Information System (INIS)

    Bietenholz, W.; Rakow, P.E.L.

    2011-03-01

    The δ-regime of QCD is characterised by light quarks in a small spatial box, but a large extent in (Euclidean) time. In this setting a specific variant of chiral perturbation theory - the δ-expansion - applies, based on a quantum mechanical treatment of the quasi onedimensional system. In particular, for vanishing quark masses one obtains a residual pion mass M R π , which has been computed to the third order in the δ-expansion. A comparison with numerical measurements of this residual mass allows for a new determination of some Low Energy Constants, which appear in the chiral Lagrangian. We first review the attempts to simulate 2-flavour QCD directly in the δ-regime. This is very tedious, but results compatible with the predictions for M R π have been obtained. Then we show that an extrapolation of pion masses measured in a larger volume towards the δ-regime leads to good agreement with the theoretical predictions. From those results, we also extract a value for the (controversial) sub-leading Low Energy Constant anti l 3 . (orig.)

  19. British Columbia's new coalbed methane royalty regime

    International Nuclear Information System (INIS)

    Molinski, D.

    2002-01-01

    The British Columbia Ministry of Energy and Mines is promoting the development of the coalbed methane (CBM) industry in the province in order to make CBM a viable and competitive investment option for industry. It is establishing a regulatory and fiscal regime for CBM development. Issues of concern regarding CBM development include water production, gas production rates, well numbers, and marginal economics. The features of the CBM royalty regime include a new producer cost of service allowance, the creation of a CBM royalty tax bank to collect excess PCOS allowances, and a royalty tax credit for wells drilled by the end of February, 2004. The marginal well adjustment factor threshold has been raised from 180 mcf per day to 600 mcf per day for CBM only. It was noted that royalties will probably not be payable for several years following the first commercial well because royalties are very depending on capital and operating costs, local infrastructure and price. Royalty regimes cannot save CBM from low gas prices, poor resources or economics. 2 figs

  20. Private actor accountability on international regimes

    Directory of Open Access Journals (Sweden)

    Wahyudi Purnomo

    2017-12-01

    Full Text Available Public-Private Partnerships (PPPs have emerged along with the growing role of corporations in global development. One of the largest forms of PPP today is the UN Global Compact. The UN Global Compact involves of companies, NGOs, IGOs and state governments. All of them are trying to realize globalization with a more humanist face with attention to the protection of human rights, environment, labor standards and anti-corruption. Engaging private actors in global governance, The UN Global Compact raises many issues such as power, authority, and legitimacy. The effort to tackle it all is to increase PPP accountability. This research seeks to describe what efforts can be made to enhance private accountability within the international regime. The research undertaken is a descriptive study, focuses on public-private partnerships in the UN Global Compact regime. The study found that there were two attempts that could be done. First, by involving the stakeholders in the development of procedures, mechanisms, reporting and monitoring associated with trying to improve the company’s reputation. Second, by looking at corporate relations as agent and UN Global Compact as principal in principal-agent relation in the international regime.

  1. JT-60U high performance regimes

    International Nuclear Information System (INIS)

    Ishida, S.

    1999-01-01

    High performance regimes of JT-60U plasmas are presented with an emphasis upon the results from the use of a semi-closed pumped divertor with W-shaped geometry. Plasma performance in transient and quasi steady states has been significantly improved in reversed shear and high- βp regimes. The reversed shear regime elevated an equivalent Q DT eq transiently up to 1.25 (n D (0)τ E T i (0)=8.6x10 20 m-3·s·keV) in a reactor-relevant thermonuclear dominant regime. Long sustainment of enhanced confinement with internal transport barriers (ITBs) with a fully non-inductive current drive in a reversed shear discharge was successfully demonstrated with LH wave injection. Performance sustainment has been extended in the high- bp regime with a high triangularity achieving a long sustainment of plasma conditions equivalent to Q DT eq ∼0.16 (n D (0)τ E T i (0)∼1.4x10 20 m -3 ·s·keV) for ∼4.5 s with a large non-inductive current drive fraction of 60-70% of the plasma current. Thermal and particle transport analyses show significant reduction of thermal and particle diffusivities around ITB resulting in a strong Er shear in the ITB region. The W-shaped divertor is effective for He ash exhaust demonstrating steady exhaust capability of τ He */τ E ∼3-10 in support of ITER. Suppression of neutral back flow and chemical sputtering effect have been observed while MARFE onset density is rather decreased. Negative-ion based neutral beam injection (N-NBI) experiments have created a clear H-mode transition. Enhanced ionization cross- section due to multi-step ionization processes was confirmed as theoretically predicted. A current density profile driven by N-NBI is measured in a good agreement with theoretical prediction. N-NBI induced TAE modes characterized as persistent and bursting oscillations have been observed from a low hot beta of h >∼0.1-0.2% without a significant loss of fast ions. (author)

  2. Autonomia e relevância dos regimes The autonomy and relevance of regimes

    Directory of Open Access Journals (Sweden)

    Gustavo Seignemartin de Carvalho

    2005-12-01

    Full Text Available Teorias institucionalistas na disciplina de relações internacionais usualmente definem regimes como um conjunto de normas e regras formais ou informais que permitem a convergência de expectativas ou a padronização do comportamento de seus participantes em uma determinada área de interesses com o objetivo de resolver problemas de coordenação que tenderiam a resultados não pareto-eficientes. Como estas definições baseadas meramente na "eficiência" dos regimes não parecem suficientes para explicar sua efetividade, o presente artigo propõe uma definição diferente para regimes: a de arranjos políticos que permitem a redistribuição dos ganhos da cooperação pelos participantes em uma determinada área de interesses em um contexto de interdependência. Regimes possuiriam efetividade pela sua autonomia e relevância, ou seja, por possuírem existência objetiva autônoma da de seus participantes e por influenciarem seu comportamento e expectativas de maneiras que não podem ser reduzidas à ação individual de nenhum deles. O artigo inicia-se com uma breve discussão sobre as dificuldades terminológicas associadas ao estudo de regimes e a definição dos conceitos de autonomia e relevância. Em seguida, classifica os diversos autores participantes do debate em duas perspectivas distintas, uma que nega (não-autonomistas e outra que atribui (autonomistas aos regimes autonomia e relevância, e faz uma breve análise dos autores e tradições mais significativos para o debate, aprofundando-se nos autonomistas e nos argumentos que reforçam a hipótese aqui apresentada. Ao final, o artigo propõe uma decomposição analítica dos regimes nos quatro elementos principais que lhes propiciam autonomia e relevância: normatividade, atores, especificidade da área de interesses e interdependência complexa com o contexto.Regimes are defined by institutionalist theories in the discipline of International Relations as formal or informal sets

  3. O PARADOXO APLICADO

    Directory of Open Access Journals (Sweden)

    ALEXANDRE COSTA e JOÃO WANDERLEY GERALDI

    2007-01-01

    Full Text Available In this article we discuss the denial of the centrality of the linguistic epistemologyby the disciplinary discourse of Applied Linguistics. We intend to show that itsSIGNÓTICA, v. 19, n. 2, p. 157-175, jul./dez. 2007 173attempt at self-definition, by means of emphasis in its transdisciplinary relations,systematically erases its stable epistemologic base, conforming the positivedenial of Linguistics in favor of the affirmation of applied demands.KEY WORDS: linguistics, applied linguistics, epistemology.NOTASNeste artigo discutimos a negação da centralidade da epistemologia lingüísticapelo discurso disciplinar da Lingüística Aplicada. Pretendemos mostrar quesua tentativa de autodefinição por meio da ênfase em suas relações transdisciplinaresapaga sistematicamente sua base epistemológica estável, conformandouma negação positiva da Lingüística em favor da afirmação dasdemandas aplicadas.

  4. FISHER INFORMATION OF DYNAMIC REGIME TRANSITIONS IN ECOLOGICAL SYSTEMS

    Science.gov (United States)

    Ecosystems often exhibit transitions between multiple dynamic regimes (or steady states). As ecosystems experience perturbations of varying regularity and intensity, they may either remain within the state space neighborhood of the current regime, or ?flip? into the neighborhood ...

  5. Redução química e biológica do cromo hexavalente aplicado ao solo

    Directory of Open Access Journals (Sweden)

    D. D. Castilhos

    2001-06-01

    Full Text Available Realizou-se um experimento em laboratório, com o objetivo de avaliar não só a redução do cromo hexavalente aplicado ao solo com ênfase ao efeito da aplicação de carbono orgânico, manganês divalente, mas também a participação da microbiota do solo. Utilizaram-se, como unidades experimentais, amostras de 50 g de um Argissolo, acondicionadas em sacos de polipropileno e incubadas durante 42 dias com calcário para elevar o pH a 6,0 (2,0 t ha-1 de CaCO3 + MgCO3 na proporção de 2:1, Cr6+, esterco bovino e Mn2+ nas doses de 20, 50 e 40 mg kg-1, respectivamente. Metade das amostras foi sujeita à esterilização por autoclavagem com o objetivo de eliminar a atividade biológica. A aplicação de esterco bovino e sulfato de manganês promoveu a total redução do cromo hexavalente para cromo trivalente (Cr6+ → Cr3+ no solo, em 42 dias. Os modelos, quadrático e exponencial, foram os que melhor descreveram a cinética de redução com o tempo. A redução do Cr6+ foi estimulada pela atividade microbiana, sendo 16% maior em amostras de solo não esterilizadas, que continham esterco bovino, em comparação com as mesmas amostras esterilizadas por autoclavagem. Os resultados demonstraram que a descontaminação do solo que contém teores tóxicos de Cr6+ pode ser viabilizada tanto pela incorporação de adubo orgânico como pela manutenção de sua atividade biológica.

  6. Avaliação do selamento marginal promovido por sistemas adesivos aplicados em esmalte e dentina

    Directory of Open Access Journals (Sweden)

    Amanda Aguiar

    2015-11-01

    Full Text Available Objetivo: Avaliar o selamento marginal promovido por dois diferentes sistemas adesivos em esmalte e dentina através de microinfiltração. Método: Foram utilizados 20 terceiros molares humanos hígidos. Os sistemas adesivos Adper Single Bond 2 (convencional e Adper SE Plus (autocondicionante foram aplicados em cavidades Classe V, nas faces vestibular e lingual, seguindo-se restauração com resina composta Filtek Z350 na técnica incremental e fotoativação com aparelho de lâmpada halógena (VIP, Bisco, 550mW/cm². Os dentes restaurados permaneceram armazenados em água destilada (24h/37°C, foi feito o acabamento, termociclagem (500 ciclos, 5°/55°C, 30 segundos, impermeabilização dos ápices dentários com resina acrílica e o restante do dente com três camadas de esmalte cosmético, exceto 1 milímetro ao redor da cavidade. Seguiram-se a imersão em solução aquosa de nitrato de prata a 50% (2 h em ambiente escuro, lavagem, imersão em solução reveladora Kodak (8 h sob luz fluorescente e lavagem. As restaurações foram seccionadas pelo centro, no sentido V-L, obtendo-se duas fatias. A microinfiltração foi avaliada por um examinador treinado, em software UTHSCSA Image Tool for Windows 3.0, com dois métodos: qualitativo (escala visual: 0- sem infiltração; 1- infiltração em esmalte; 2- em dentina nas paredes axial e gengival; 3 – idem 3 e em direção à polpa e quantitativo (porcentagem de infiltração de nitrato de prata. Os dados foram submetidos ao teste t de Student (alfa=5%. Resultados: Não foi observada diferença entre os materiais na porcentagem de infiltração de nitrato de prata (p=0,595, nem na avaliação por escala (p=0,408. Houve infiltração em dentina nos dois grupos. Conclusão: os sistemas adesivos testados apresentaram comportamento semelhante.

  7. Static converters power supply: transient regimes; Alimentation par convertisseurs statiques: regimes transitoires

    Energy Technology Data Exchange (ETDEWEB)

    Pasqualini, G. [Ecole Superieure d`Electricite (France)

    1997-08-01

    Direct current motors, asynchronous and variable speed synchronous motors are generally supplied with static converters. Speed variation is obtained by voltage variation in DC motors and by frequency variation in AC motors. In these conditions, these motors are running continuously in transient regimes: the DC motors current is not direct and the AC motors current is not sinusoidal. This situation leads to pulsing couples in the shaft line and to an increase of Joule effect losses. The aim of this paper is to present the methods of study of the electric motors functioning using the shape of the power voltages given by converters and mathematical models of these machines. The synchronous machines are rapidly described while the asynchronous machines are studied using Ku`s transformation instead of Park`s transformation for simplification. For each type of machine, calculation methods allow to determine their current, additional losses and couple characteristics. The transient regimes considered are those remaining when the motor is running at a constant speed and defined regime (supply voltages are periodical functions of time). These transient regimes are identically reproducing with a frequency which is a multiple of the converters supply frequency. Transient regimes due to functioning changes of the motor, such as resisting couple or power supply frequency variations, are not considered in this study. (J.S.) 9 refs.

  8. Terms of trade and exchange rate regimes in developing countries

    OpenAIRE

    Christian Broda

    2002-01-01

    Since Friedman (1953), an advantage often attributed to flexible exchange rate regimes over fixed regimes is their ability to insulate more effectively the economy against real shocks. I use a post-Bretton Woods sample (1973-96) of seventy-five developing countries to assess whether the responses of real GDP, real exchange rates, and prices to terms-of-trade shocks differ systematically across exchange rate regimes. I find that responses are significantly different across regimes in a way tha...

  9. Refrigeration. Two-Phase Flow. Flow Regimes and Pressure Drop

    DEFF Research Database (Denmark)

    Knudsen, Hans-Jørgen Høgaard

    2002-01-01

    The note gives the basic definitions used in two-phase flow. Flow regimes and flow regimes map are introduced. The different contributions to the pressure drop are stated together with an imperical correlation from the litterature.......The note gives the basic definitions used in two-phase flow. Flow regimes and flow regimes map are introduced. The different contributions to the pressure drop are stated together with an imperical correlation from the litterature....

  10. Ejes de Vigilancia Tecnológica Aplicados en Universidades con Estudios a Distancia (Axes of Technological Surveillance Applied in Distance Learning Universities)

    OpenAIRE

    Arlin J. Izarra Reverol; José G. Sánchez Morles; Norma M. Caira Tovar

    2014-01-01

    Spanish Abstract. El objetivo de la presente investigación es determinar los ejes de la vigilancia tecnológica aplicados en las Universidades del Municipio Maracaibo que ofrecen estudios a distancia, siguiendo los aportes teóricos de López et al. (2007), Palop y Vicente (1999), Martinet y Ribault (1989), Escorsa y Valls (2005), Fundación COTEC (1999) y Jakobiak (1995). La investigación es descriptiva, con un diseño no experimental transeccional de campo. La población la conforman doce directo...

  11. Modelagem e simulação de reator de leito expandido aplicado ao hidroprocessamento de oleos pesados e residuos de destilação

    OpenAIRE

    João Capistrano Nobre de Abreu

    1995-01-01

    Resumo: O presente trabalho apresenta a modelagem e simulação de um reator de leito fluidizado trifásico aplicado ao hidroprocessamento de óleos pesados e resíduos de destilação. Duas reações principais foram consideradas no desenvolvimento do modelo, o hidrocraqueamento e a hidrodemetalização tendo sido a primeira considerada como exclusivamente térmica e a segunda como catalítica. O grau de mistura do reator foi representado de duas maneiras distintas. Inicialmente, considerou-se o sistem...

  12. Diseño de un sistema de administración por procesos aplicado a la Matriz del Grupo Empresarial HOLDINGDINE S.A.

    OpenAIRE

    Ayala de la Cueva, Karina de los Angeles

    2011-01-01

    103 hojas : ilustraciones, 29 x 21 cm + CD-ROM 3853 Esta investigación relacionada con el DISEÑO DE UN SISTEMA DE ADMINISTRACION POR PROCESOS APLICADO A LA MATRIZ DEL GRUPO EMPRESARIAL HOLDINGDINE S.A., se inicia exponiendo un marco teórico de los escenarios de la empresa moderna que actualmente se sustentan en procesos bajo un pensamiento sistémico, con el único objetivo de satisfacer en primer lugar al cliente interno para luego desplazarse en la atención del cliente externo, elementos ...

  13. Level-ARCH Short Rate Models with Regime Switching

    DEFF Research Database (Denmark)

    Christiansen, Charlotte

    This paper introduces regime switching volatility into level- ARCH models for the short rates of the US, the UK, and Germany. Once regime switching and level effects are included there are no gains from including ARCH effects. It is of secondary importance exactly how the regime switching is spec...

  14. Mainstreaming solar : Stretching the regulatory regime through business model innovation

    NARCIS (Netherlands)

    Huijben, J.C.C.M.; Verbong, G.P.J.; Podoynitsyna, K.S.

    This paper explores how the regulatory regime for Solar PV, defined as a combination of niche shielding and mainstream regulations, affects niche business models, using the Dutch and Flemish regulatory regimes as examples. The regulatory regime does not influence all components of the business

  15. The global nuclear safety regime and its impact in Brazil

    International Nuclear Information System (INIS)

    Almeida, C.

    2004-01-01

    This work describes the Global Nuclear Safety Regime that was established worldwide after the accident at the Tchernobyl nuclear power plant. This regime is composed of biding international safety conventions, globally accepted safety standard, and a voluntary peer review system. The impact of this Global Regime in Brazil is also discussed. (Author)

  16. Peaceful Protest, Political Regimes, and the Social Media Challenge

    Science.gov (United States)

    2016-06-01

    University, 2012 Randolph J. Fleming, II Major, United States Army B.A., Virginia Commonwealth University, 2004 Submitted in partial fulfillment of...intermediate regimes or transitioning regimes carrying the burden of instability and conflict.23 In a similar vein, Henderson identifies democracies, as...spreading infectious ideologies through ICT.25 Furthermore, Regan and Henderson indicate that intermediate, anocratic regimes tend to oppress

  17. The Tributary Regime in the oil sector

    International Nuclear Information System (INIS)

    Carta Petrolera

    1998-01-01

    The tributary regime of the oil sector, is framed by the fiscal crisis that the country, maxim if one keeps in mind the importance of the fiscal revenues originated in the exploitation of these resources in Colombia, so much for the tribute coming from the foreign investment of the sector, like for the utilities generated by ECOPETROL and its impact in the public finances. However in front of this focus, the strategic importance of maintaining the investment in hydrocarbons and the paper that the fiscal politics and the tributary politics for the sector should play in the future and they constitute the government's key pieces

  18. Electron acceleration in the bubble regime

    Energy Technology Data Exchange (ETDEWEB)

    Jansen, Oliver

    2014-02-03

    The bubble regime of laser-wakefield acceleration has been studied over the recent years as an important alternative to classical accelerators. Several models and theories have been published, in particular a theory which provides scaling laws for acceleration parameters such as energy gain and acceleration length. This thesis deals with numerical simulations within the bubble regime, their comparison to these scaling laws and data obtained from experiments, as well as some specific phenomenona. With a comparison of the scaling laws with numerical results a parameter scan was able to show a large parameter space in which simulation and theory agree. An investigation of the limits of this parameter space revealed boundaries to other regimes, especially at very high (a{sub 0} > 100) and very low laser amplitudes (a{sub 0} < 4). Comparing simulation data with data from experiments concerning laser pulse development and electron energies, it was found that experimental results can be adequately reproduced using the Virtual-Laser-Plasma-Laboratory code. In collaboration with the Institut fuer Optik und Quantenelektronik at the Friedrich-Schiller University Jena synchrotron radiation emitted from the inside of the bubble was investigated. A simulation of the movement of the electrons inside the bubble together with time dependent histograms of the emitted radiation helped to prove that the majority of radiation created during a bubble acceleration originates from the inside of the bubble. This radiation can be used to diagnose the amplitude of oscillation of the trapped electrons. During a further study it was proven that the polarisation of synchrotron radiation from a bubble contains information about the exact oscillation direction. This oscillation was successfully controlled by using either a laser pulse with a tilted pulse front or an asymmetric laser pulse. First results of ongoing studies concerning injecting electrons into an existing bubble and a scheme called

  19. Operation regimes of a dielectric laser accelerator

    Science.gov (United States)

    Hanuka, Adi; Schächter, Levi

    2018-04-01

    We investigate three operation regimes in dielectric laser driven accelerators: maximum efficiency, maximum charge, and maximum loaded gradient. We demonstrate, using a self-consistent approach, that loaded gradients of the order of 1 to 6 [GV/m], efficiencies of 20% to 80%, and electrons flux of 1014 [el/s] are feasible, without significant concerns regarding damage threshold fluence. The latter imposes that the total charge per squared wavelength is constant (a total of 106 per μm2). We conceive this configuration as a zero-order design that should be considered for the road map of future accelerators.

  20. The trade regime and the climate regime. Institutional evolution and adaptation

    International Nuclear Information System (INIS)

    Brewer, Thomas L.

    2003-01-01

    This article addresses concerns that the multilateral trade regime centered in the WTO and the emerging climate regime may conflict in ways that could be damaging to either or both. The article discusses the institutional and diplomatic context of these concerns, and it identifies the kinds of issues that are in question. The analysis suggests that there are opportunities for win-win outcomes in the interactions of the two regimes, for instance in the possibility of reducing fossil fuel subsidies. However, there are also problematic areas where they intersect. A core issue-and as yet an unresolved one-is whether and how emission credit trading and other activities envisioned by the Kyoto Protocol would be subject to WTO rules. The resolution of this issue will affect many other issues as well. Additional specific issues about the interactions of particular provisions in WTO agreements and the Kyoto Protocol are analyzed in a subsequent companion article in Climate Policy

  1. Transient regimes in a heavy water reactor; Regimes transitoires dans un reacteur a eau lourde

    Energy Technology Data Exchange (ETDEWEB)

    Raievski, V [Commissariat a l' Energie Atomique, Saclay(France). Centre d' Etudes Nucleaires

    1953-07-01

    We studied the variations of power and reactivity of a reactor when we raise in a continuous way the starting plates. During the subcritical regime (negative reactivity), the power is determined by reactivity and by the intensity of the sources of photo neutrons, produced during the previous work of the reactor. When, during the rise of the plates, the reactor, pass by the critical regime (zero reactivity), one notes that the reached power is independent of the initial reactivity. During the sur-critical regime (positive reactivity), the elevation of temperature of the uranium bars slows down the growth of reactivity due to the movements of the plates. The power stretches then toward a value that depends only on the regime of cooling of the reactor and the excess of the available reactivity. This survey permits to choose such a rise speed, that reactivity remains constantly lower to a value beyond which the piloting of the reactor becomes difficult. This result is not more valid, if the intensity of the sources is insufficient, what takes place during the first divergences and after a stop of long length. (author) [French] On etudie les variations de puissance et de reactivite d'un reacteur quand on leve d'une facon continue les plaques de demarrage. Pendant le regime subcritique (reactivite negative), la puissance est determinee par la reactivite et par l'intensite des sources de photoneutrons, produites pendant la marche anterieure du reacteur. Quand, au cours de la montee des plaques, le reacteur passe par le regime critique (reactivite nulle), on constate que la puissance atteinte est independante de la reactivite initiale. Pendant le regime surcritique (reactivite positive), l'elevation de temperature des barres d'uranium ralentit l'accroissement de reactivite due aux mouvements des plaques. La puissance tend alors vers une valeur qui ne depend plus que du regime de refroidissement du reacteur et de l'exces de la reactivite disponible. Cette etude permet de

  2. Change of secondary water regime of Paks NPP. Change of secondary water regime at Unit 2

    International Nuclear Information System (INIS)

    Doma, A.; Patek, G.; Pinter, T.; Bajari, M.; Tilky, P.

    2001-01-01

    The installation of high pH water regime during the 17th cycle of Unit 2 aimed to decrease the amount of transportation inlet of erosion-corrosion products (magnitude) in feedwater to SGs. The resolution of OAH-NBI permitting the installation ordained to make an evaluation of the process. The main conclusions and results are discussed. The high pH water regime proved to be adequate in the case of Unit 2 as well, similarly to Units 3, 4 and 1. (R.P.)

  3. Método de Montessori aplicado à demência: revisão da literatura Método Montessori aplicado a la demencia: revisión de la literatura Montessori Method applied to dementia: literature review

    Directory of Open Access Journals (Sweden)

    Daniela Filipa Soares Brandão

    2012-06-01

    Full Text Available O método de Montessori foi aplicado inicialmente às crianças, mas atualmente aplica-se a pessoas com demência. O objetivo deste trabalho é fazer uma revisão sistemática da investigação sobre a eficácia desse método, utilizando a Medical Literature Analysis and Retrieval System Online (Medline com as palavras-chave demência e método de Montessori. Foram selecionados 10 estudos, onde se verificam melhorias significativas na participação e no envolvimento construtivo e diminuição dos afectos negativos e do envolvimento passivo. Não obstante, as revisões da literatura acerca desta intervenção não farmacológica em demência classificam esse método como fraco, em termos de eficácia. Essa aparente discrepância pode explicar-se porque o método de Montessori pode ter, de fato, uma influência pouco significativa em dimensões como a dos problemas comportamentais ou porque não existe investigação acerca desse método com elevados níveis de controle como são a presença de vários grupos de controle ou o duplo-cego.El método Montessori se aplicó inicialmente a los niños, pero ahora se aplica a las personas con demencia. El propósito de este estudio es revisar de forma sistemática la investigación sobre la eficacia de este método, utilizando Medical Literature Analysis and Retrieval System Online (Medline con las palabras clave demencia y método Montessori. Se seleccionaron 10 estudios, que tienen mejoras significativas en la participación y en el compromiso constructivo, y la reducción de efectos negativos y de la participación pasiva. Sin embargo, la revisión de la literatura sobre esta intervención no farmacológica en la demencia clasifica este método como débil en términos de eficacia. Esta aparente discrepancia puede explicarse porque el método Montessori puede tener una influencia poco significativa en los problemas de conducta, o porque no hay investigación sobre este método con altos niveles de

  4. Pulse regime in formation of fractal fibers

    Energy Technology Data Exchange (ETDEWEB)

    Smirnov, B. M., E-mail: bmsmirnov@gmail.com [Joint Institute for High Temperatures (Russian Federation)

    2016-11-15

    The pulse regime of vaporization of a bulk metal located in a buffer gas is analyzed as a method of generation of metal atoms under the action of a plasma torch or a laser beam. Subsequently these atoms are transformed into solid nanoclusters, fractal aggregates and then into fractal fibers if the growth process proceeds in an external electric field. We are guided by metals in which transitions between s and d-electrons of their atoms are possible, since these metals are used as catalysts and filters in interaction with gas flows. The resistance of metal fractal structures to a gas flow is evaluated that allows one to find optimal parameters of a fractal structure for gas flow propagation through it. The thermal regime of interaction between a plasma pulse or a laser beam and a metal surface is analyzed. It is shown that the basic energy from an external source is consumed on a bulk metal heating, and the efficiency of atom evaporation from the metal surface, that is the ratio of energy fluxes for vaporization and heating, is 10{sup –3}–10{sup –4} for transient metals under consideration. A typical energy flux (~10{sup 6} W/cm{sup 2}), a typical surface temperature (~3000 K), and a typical pulse duration (~1 μs) provide a sufficient amount of evaporated atoms to generate fractal fibers such that each molecule of a gas flow collides with the skeleton of fractal fibers many times.

  5. Managing Disagreement: A Defense of "Regime Bias"

    Science.gov (United States)

    Sabl, Andrew

    2011-02-01

    Stein Ringen's theory of democratic purpose cannot do the work expected of it. Ringen's own criteria oscillate between being too vague to be useful (i.e. "freedom") or, when specified more fully, conflicting, so that almost all democracies will seem to be potentially at cross-purposes with themselves rather than their purposes or sub-purposes being mutually reinforcing. This reflects a bigger and more theoretical problem. Disagreement about the purpose of democracy is built into democracy itself. The whole point of many (perhaps all) of our democratic institutions is to arrive at conditionally legitimate decisions in spite of such disagreement. So-called regime bias, i.e. the tendency to assess democracies according to the form and stability of their institutions rather than their results or their ability to serve certain purposes, does not in fact arise from bias. It arises on the contrary from a determination to avoid the bias inherent in giving some-inevitably partisan-ideals of what democracies should do pride of place over others in a scheme of measurement or evaluation. And even a regime-based definition of democracy must itself make simplifying assumptions that elide possible normative controversies over how the democratic game is best played. Vindicating one's preferred set of democratic ideals against alternatives is a completely legitimate enterprise and lends richness to debates within and across democracies. But it is an inherently ideological and political enterprise, not a neutral or scholarly one.

  6. Tlatelolco regime and nonproliferation in Latin America

    International Nuclear Information System (INIS)

    Redick, J.R.

    1981-01-01

    The regime established by the Treaty of Tlatelolco supports peace and security in the Latin American region and global nonproliferation efforts. Circumstances leading to the creation of the nuclear-weapon-free zone include careful preparations and negotiations, individual leadership, existence of certain shared cultural and legal traditions of Latin American countries, and the temporary stimulus of the Cuban missile crisis. The lack of overt superpower pressure on Latin America, compared with more turbulent regions, has permitted continued progress toward full realization of the zone. Tlatelolco's negotiating process, as well as the substance of the Treaty, deserve careful consideration relative to other areas. The Treaty enjoys wide international approval, but full support by certain Latin American States (Argentina, Brazil, Chile, Cuba) has been negatively affected by the failure of the US Senate to ratify Tlatelolco's Protocol I. Nuclear programs of Argentina, Brazil, and Mexico are expanding rapidly and these nations are forming linkages with West European countries, rather than the United States. The May 1980 Argentine-Brazilian nuclear agreement foresees significant cooperation between the two nation's nuclear energy commissions and more coordinated resistance to the nuclear supplier countries. Argentine-Brazilian nuclear convergence and the response accorded to it by the United States will have significant implications for the future of the Tlatelolco regime and nonproliferation in Latin America. 52 references

  7. Three novel tokamak plasma regimes in TFTR

    International Nuclear Information System (INIS)

    Furth, H.P.

    1985-10-01

    Aside from extending ''standard'' ohmic and neutral beam heating studies to advanced plasma parameters, TFTR has encountered a number of special plasma regimes that have the potential to shed new light on the physics of tokamak confinement and the optimal design of future D-T facilities: (1) High-powered, neutral beam heating at low plasma densities can maintain a highly reactive hot-ion population (with quasi-steady-state beam fueling and current drive) in a tokamak configuration of modest bulk-plasma confinement requirements. (2) Plasma displacement away from limiter contact lends itself to clarification of the role of edge-plasma recycling and radiation cooling within the overall pattern of tokamak heat flow. (3) Noncentral auxiliary heating (with a ''hollow'' power-deposition profile) should serve to raise the central tokamak plasma temperature without deterioration of central region confinement, thus facilitating the study of alpha-heating effects in TFTR. The experimental results of regime (3) support the theory that tokamak profile consistency is related to resistive kink stability and that the global energy confinement time is determined by transport properties of the plasma edge region

  8. Strengthening the non proliferation regime: French views

    International Nuclear Information System (INIS)

    Delaune, P.

    2013-01-01

    3 main issues can be identified in the French policy concerning the backing of non proliferation: 1) responding resolutely to proliferation crises, 2) reinforcing substantive efforts to prevent and impede proliferation, and 3) strengthening the non-proliferation regime. The first issue is very important because combating proliferation is vital to the security of all. Concerning the second issue, France attaches particular importance to strengthening specific measures to prevent and check proliferation. Let me mention a few proposals that we put forward: exports need to be controlled more effectively, proliferation activities have to be criminalized, or the development of proliferation-resistant technologies should be supported. Concerning the third issue it means the strengthening of the non-proliferation regime, France proposes several means: -) aiming at the universalization of the additional protocol; -) ensuring that the Agency continues to have sufficient human, financial and technical resources to fulfill its verification mission effectively; -) encouraging the IAEA to make full use of the authority available to it; -) enhancing the use of information relevant to the delivery of the IAEA mandate; and -) sharing more accurate information concerning the breaches of commitments that happen. The paper is followed by the slides of the presentation. (A.C.)

  9. Characterizing multistationarity regimes in biochemical reaction networks.

    Directory of Open Access Journals (Sweden)

    Irene Otero-Muras

    Full Text Available Switch like responses appear as common strategies in the regulation of cellular systems. Here we present a method to characterize bistable regimes in biochemical reaction networks that can be of use to both direct and reverse engineering of biological switches. In the design of a synthetic biological switch, it is important to study the capability for bistability of the underlying biochemical network structure. Chemical Reaction Network Theory (CRNT may help at this level to decide whether a given network has the capacity for multiple positive equilibria, based on their structural properties. However, in order to build a working switch, we also need to ensure that the bistability property is robust, by studying the conditions leading to the existence of two different steady states. In the reverse engineering of biological switches, knowledge collected about the bistable regimes of the underlying potential model structures can contribute at the model identification stage to a drastic reduction of the feasible region in the parameter space of search. In this work, we make use and extend previous results of the CRNT, aiming not only to discriminate whether a biochemical reaction network can exhibit multiple steady states, but also to determine the regions within the whole space of parameters capable of producing multistationarity. To that purpose we present and justify a condition on the parameters of biochemical networks for the appearance of multistationarity, and propose an efficient and reliable computational method to check its satisfaction through the parameter space.

  10. Legal framework of the environmental regulatory regime

    International Nuclear Information System (INIS)

    Black, D.

    1992-01-01

    The growing concern regarding environmental issues has presented a number of new challenges to those exploring and developing the hydrocarbon reserves located on the Newfoundland continental shelf. Not the least of these challenges is the development of new technologies in the harsh environment of the North Atlantic; in addition, these new technologies must be implemented in an existing and ever-changing regulatory regime. The legal framework of the environmental regulatory regime relating to offshore development in Canada is reviewed along with some of the more important legislation involved in regulating environmental issues in the offshore area. The legal basis for exploration, development, and management of resources located on the Newfoundland continental shelf is the Canada-Newfoundland Accord on Joint Management of Offshore Oil and Gas Resources off Newfoundland and Labrador. Administration of the Accord is the responsibility of the Canada-Newfoundland Offshore Petroleum Board. To be able to apply Canadian laws to the continental shelf, legislation was passed including the Canadian Laws Offshore Application Act as well as the Act implementing the Accord. The latter gives the Offshore Petroleum Board authority to regulate all stages involved in bringing an oil pool to production, such as granting of licenses and work authorizations. Granting of such licenses and authorizations is subject to compliance with environmental requirements, and there are provisions against certain environmental offenses such as spills. Other federal legislation applicable to the offshore includes the Canada Shipping Act and the Canadian Environmental Protection Act

  11. Unified flow regime predictions at earth gravity and microgravity

    International Nuclear Information System (INIS)

    Crowley, C.J.

    1990-01-01

    This paper illustrates the mechanistic models developed to predict flow regime transitions at earth gravity for various pipe inclinations can be successfully applied to existing microgravity flow regime data from several experiments. There is a tendency in the literature for flow regime comparisons in several inclination ranges and at various gravity (acceleration) levels to be treated by separate models, resulting in a proliferation of models for the prediction of flow regimes. One set of mechanistic models can be used to model the transitions between stratified, slug, bubbly, and annular flow regimes in pipes for all acceleration vectors and magnitudes from earth gravity to microgravity

  12. Justicia y sistema tributario. Una mirada desde la perspectiva inglesa

    Directory of Open Access Journals (Sweden)

    Patricio Masbernat

    2014-01-01

    Full Text Available Este artículo expone que la doctrina chilena aborda la cuestión de la justicia tributaria desde una triple perspectiva, económica, filosófica y jurídica. Con todo, desconfía de las posibilidades de esta última, para desarrollar soluciones genuinas de los complejos problemas que enfrenta la justicia tributaria. A partir de dicha evidencia, el autor indaga el desarrollo de este asunto en el mundo anglosajón, especialmente de Inglaterra. El autor recorre el camino que filósofos, economistas y juristas efectúan acerca de los elementos más determinantes de la justicia tributaria. Para tales efectos, luego de plantear el problema y la perspectiva analítica del artículo, revisa la idea de justicia tributaria en las doctrinas liberales clásicas, la justificación de la imposición de tributos y los fines del Estado, el concepto de tributo, la justicia conmutativa y la justicia distributiva, las finalidades extra fiscales del tributo, el principio de igualdad como expresión normativa de la justicia en la tributación. El autor concluye que no obstante que el mundo anglosajón se aborda esta cuestión desde esta triple perspectiva, y de un modo muy diferente al del Derecho Continental, la doctrina jurídica ha sido capaz de discutir acerca de estos complejos problemas jurídicos con éxito.

  13. Fire Regime Characteristics along Environmental Gradients in Spain

    Directory of Open Access Journals (Sweden)

    María Vanesa Moreno

    2016-11-01

    Full Text Available Concern regarding global change has increased the need to understand the relationship between fire regime characteristics and the environment. Pyrogeographical theory suggests that fire regimes are constrained by climate, vegetation and fire ignition processes, but it is not obvious how fire regime characteristics are related to those factors. We used a three-matrix approach with a multivariate statistical methodology that combined an ordination method and fourth-corner analysis for hypothesis testing to investigate the relationship between fire regime characteristics and environmental gradients across Spain. Our results suggest that fire regime characteristics (i.e., density and seasonality of fire activity are constrained primarily by direct gradients based on climate, population, and resource gradients based on forest potential productivity. Our results can be used to establish a predictive model for how fire regimes emerge in order to support fire management, particularly as global environmental changes impact fire regime characteristics.

  14. Fiscal Policy and Welfare under Different Exchange Rate Regimes

    DEFF Research Database (Denmark)

    Østrup, Finn

    a representativeindividual's utility, it is demonstrated that there are differences betweenexchange rate regimes with respect to the level of government spending. Thesedifferences arise first because a rise in government spending affects macroeconomicvariables differently under different exchange rate regimes......, and secondbecause the government's inclination to expand government spending is affectedby inflation which depends on the exchange rate regime. At low rates of inflation,the government is inclined to set a higher level of government spending under afixed exchange rate regime than under a floating exchange rate...... regime in whichthe monetary authority optimises preferences which include an employment targetand an inflation target. As government spending affects the representativeindividual's utility, the choice of exchange rate regime has an impact on welfare.Keywords: exchange rate regimes; fiscal policy...

  15. Algunas ideas en Relación al Psicoanálisis Aplicado y del Quijote y Sancho

    Directory of Open Access Journals (Sweden)

    Carlos Plata Mújica

    2003-10-01

    este concepto. Por una parte una experiencia clínica específica, por otra una técnica dentro de una relación dual delimitada y una teoría, que mejor se llama metapsicología, concepto este que tiende a destacar que es una teoría psicológica de lo inconsciente y, si me permiten definirla por lo negativo, una psicología que si bien tiene en cuenta lo consciente no se centra ni se agota en su exclusiva consideración, tal como sí lo hace la psicología clásica, que se inició también dentro de la segunda mitad del siglo XIX.

    El desarrollo de la teoría psicoanalítica le permitió señalar que el principal campo de aplicación del psicoanálisis es el clínico, sin que por esto sea el exclusivo, sino que se puede usar esta teoría, o metapsicología, en una gran variedad de disciplinas humanísticas que constituyen lo que se denomina el “análisis aplicado”.

    El mismo lo inició por el estudio de los contenidos mentales inconscientes de diversas obras de arte, ya sea poesía o novelas, y también por su aplicación a estudios biográficos de artistas y de investigaciones antropológicas. Recordaré acá sus ensayos sobre Moisés, Leonardo da Vinci y Dostoievski.

    A través del análisis aplicado se pueden considerar diversas variantes de la búsqueda de comprensión. Este fue empleado en el caso de Moisés como una hipótesis histórica tendiente a ubicar la génesis del monoteísmo para el culto judío de su ética y de algunas costumbres.

    En Leonardo da Vinci conectó la dificultad para terminar sus obras con las complicadas vicisitudes infantiles de su vida, también buscó enlazar una de sus obras famosas con su drama de las dos madres infantiles.

    En Dostoievski buscó esclarecer el origen tanto de su histeroepilepsia, como de su llegada a un conservatismo extraño con sus traumas, así como también de su adicción al juego.

    En todos estos estudios advirtió que buscaba aspectos de los autores sin entrar a considerar

  16. The concept of regime values: Are revitalization and regime change possible?

    NARCIS (Netherlands)

    Overeem, P.

    2015-01-01

    Among the plethora of public values, one special class is that of “regime values.” This notion plays a central role in the constitutional approach to public administration mainly developed by the late John A. Rohr. In this article, an attempt is made to assess the viability of Rohr’s concept of

  17. Do housing regimes matter? : Assessing the concept of housing regimes through configurations of housing outcomes

    NARCIS (Netherlands)

    Dewilde, C.L.

    2017-01-01

    Based on a conceptualisation of de-commodification as the right to decent and affordable housing, we assessed to what extent this right is realised for low-to-moderate-income owners and renters across Western European housing regimes in 1995 and 2012. If differences in the social production of

  18. Modern fire regime resembles historical fire regime in a ponderosa pine forest on Native American land

    Science.gov (United States)

    Amanda B. Stan; Peter Z. Fule; Kathryn B. Ireland; Jamie S. Sanderlin

    2014-01-01

    Forests on tribal lands in the western United States have seen the return of low-intensity surface fires for several decades longer than forests on non-tribal lands. We examined the surface fire regime in a ponderosa pinedominated (Pinus ponderosa) forest on the Hualapai tribal lands in the south-western United States. Using fire-scarred trees, we inferred temporal (...

  19. El enfoque de género en la etapa de reconstrucción de un desastre: análisis de programas sociales aplicados con equidad de género en Angangueo, Michoacán

    Directory of Open Access Journals (Sweden)

    Francisco Javier Verduzco Miramón

    2012-01-01

    Full Text Available El documento plantea como objetivo principal analizar los programas sociales aplicados en la etapa de reconstrucción del desastre ocurrido en Angangueo, Michoacán, tras las inundaciones y deslizamientos de laderas ocurridos en febrero del 2010. La estrategia metodológica empleada fue de corte cualitativa, utilizando técnicas como la documental, entrevistas y observación no participante, con las cuales se logró identificar los programas aplicados por las dependencias que auxiliaron a la población afectada: Empleo Temporal (pet, diconsa sa de cv "atención a desastres", Hábitat, Ahorro y Subsidio para la Vivienda, Tu Casa, Opciones Productivas, además del Fondo Nacional de Apoyos para Empresas en Solidaridad (fonaes y el Fondo de Desastres Naturales (fonden, que financió la mayoría de los programas aplicados.

  20. Segregação de fertilizantes aplicados a lanço Spreading segregation of two fertilizers

    Directory of Open Access Journals (Sweden)

    José P. Molin

    2009-01-01

    Full Text Available A uniformidade transversal da distribuição de fertilizantes e corretivos a lanço tem grande dependência da qualidade e da condição física do produto a ser aplicado. Especialmente no caso das formulações, esse aspecto é relevante e por isso o presente trabalho teve o objetivo de verificar a distribuição dos grãos e a constância na formulação aplicada na extensão da largura de trabalho de uma máquina distribuidora a lanço com dois fertilizantes. Foram efetuadas análises químicas do produto depositado em coletores dispostos transversalmente e analisadas as distribuições individuais dos elementos das fórmulas. Os resultados evidenciam que os fertilizantes apresentaram diferenças na sua formulação ao longo da largura, sendo que o fertilizante que continha micronutrientes obteve maiores desvios (de até 100% em relação à formulação aplicada, e sua segregação foi elevada em relação aos macronutrientes primários (até 9,5% para N e secundários estudados (até 39,0% para Ca, o que também indica distribuição de pior qualidade dos fertilizantes. O outro fertilizante apresentou desvios de até 17,8% para N e 34,1% para K na formulação ao longo da largura de aplicação.The transversal distribution uniformity of spreaders frequently used for fertilizer and lime distribution are dependent of the quality and physical condition of the product to be distributed. Especially for formulated fertilizers it is relevant and for this reason the objective of this work was verifying the distribution of particles and constancy on the applied composition throughout the spreading width of a spread machine with two fertilizers. The fertilizer collected along the distribution was submitted to chemical analyses and the distribution of each individual element was analyzed. The results indicate that both fertilizers showed differences on the formulation considering the distance from the throwing position to where they were collected

  1. Seletividade de herbicidas aplicados nas gramas Santo Agostinho e Esmeralda Selectivity of herbicides applied on St. Augustinegrass and Emerald turfs

    Directory of Open Access Journals (Sweden)

    N.V. Costa

    2010-01-01

    Full Text Available Objetivou-se neste trabalho avaliar a seletividade de herbicidas aplicados nas gramas Santo Agostinho (Stenotaphrum secundatum e Esmeralda (Zoysia japonica em condições de campo. O delineamento experimental utilizado foi o de blocos casualizados, com quatro repetições. As gramas foram cortadas a 3 cm de altura e, em seguida, foram feitas as aplicações dos herbicidas. Os tratamentos utilizados foram: testemunha sem aplicação, fluazifop-p-butil (125 g ha-1, sethoxydim+óleo mineral (276 g ha-1 + 0,5% v v-1 de Assist, bispyribac-sodium (25 g ha-1, chlorimuron-ethyl (15 g ha-1, ethoxysulfuron (150 g ha-1, halosulfuron (112,5 g ha-1, iodosulfuron-methyl (10 g ha-1, metsulfuron-methyl (2,4 g ha-1, nicosulfuron (125 g ha-1, pyrithiobac-sodium (140 g ha-1, trifloxysulfuron-sodium (22,5 g ha-1, 2,4-D (720 g ha-1, quinclorac (375 g ha-1, atrazina (1.250 g ha-1, bentazon (600 g ha-1, linuron (1.350 g ha-1, fomesafen (187,5 g ha-1, lactofen (120 g ha-1, oxadiazon (600 g ha-1 e oxyfluorfen (720 g ha-1. Os herbicidas que apresentaram potencial de seletividade para o gramado de S. secundatum foram: os inibidores da ALS chlorimuron-ethyl, ethoxysulfuron, halosulfuron, iodosulfuron-methyl e metsulfuron-methyl, o mimetizador de auxina 2,4-D, os inibidores do fotossistema II atrazina e bentazon, bem como os inibidores da Protox fomesafen, lactofen e o oxadiazon. Para o gramado de Z. japonica, os herbicidas que apresentaram potencial de seletividade foram: os inibidores da ALS chlorimuron-ethyl, ethoxysulfuron, halosulfuron, metsulfuron-methyl e nicosulfuron, os mimetizadores de auxina 2,4-D e quinclorac, os inibidores do fotossistema II atrazina e bentazon, além dos inibidores da Protox fomesafen, lactofen e o oxadiazon.The objective of this study was to evaluate the selectivity of herbicides applied on turfgrasses St. Augustinegrass (Stenotaphrum secundatum and Emerald (Zoysia japonica under field conditions. The experimental design was randomized blocks

  2. Proliferation studies for different radiotherapy fractionation regimes

    International Nuclear Information System (INIS)

    Jones, L.

    1996-01-01

    Full text: This study was undertaken to investigate extended treatment schedules and compare the differences between schedules for highly proliferative tumours. Treatment schedules can be extended for various reasons e.g. public holidays, early side effects. For highly proliferative tumours this can dramatically reduce the effective dose delivered to the tumour. To deduce the most effective schedule fractionation regimes are compared to a common schedule so that the effects can be understood. Thus an equation to allow this to be done for the proliferative case has been derived. (i) The linear quadratic model with proliferation has been used to investigate the effect on biological effective dose (BED) when treatment schedules are extended. (ii) An equation was derived for comparison with a standard effective dose (SED) of 2Gy/fraction given daily 5 days per week, this is a common schedule in most radiotherapy centres. The SED equation derived for the proliferative case is where n 1 and n 2 are the number of fractions for the initial and equivalent schedules respectively, d 1 is the dose delivered per fraction for the initial schedules. T 1 is the time taken for the initial schedule (in days) and T p is the proliferation half life for the tumour involved. SEDs were calculated for the CHART regime of 36 fractions at 1.5 Gy in 12 days (Saunders et al. 1988, cited in Fowler J F, Brit. J. Radiol. 62: 679-694, 1989) and various other schedules. Late effects of these schedules and their standard equivalents were compared. The dose required to achieve the same BED when a treatment schedule is extended has been found to be quite large in some circumstances. For breast tumours a loss of 2Gy 10 BED to tumour occurs after ten days extension of treatment time (T p =12 days,T k =12 days). For head and neck tumours a loss of 2Gy 10 BED occurs after only three and a half days (T p =3 days). From these results it seems that an accelerated fractionation schedule would be advantageous

  3. Indutores de problematização aplicados a uma aula de antropologia e dilema moral emergente

    Directory of Open Access Journals (Sweden)

    José Luís Gonçalves

    2011-12-01

    Full Text Available Este artigo relata uma experiência ocorrida no âmbito do ensino de estudantes do curso de educação social que, após terem realizado uma investigação de cariz antropológica num bairro da cidade do Porto a partir do conceito de “não-lugares” de Marc Augé, continuavam sem “ver” e “reconhecer” os seus habitantes, permanecendo estes sem rosto e nome concretos nas transcrições e nos discursos destes estudantes. O problema da invisibilidade aqui abordado foi trabalhado em sala de aula a partir do modelo teórico da problematização e aplicado, neste caso, aos dilemas morais suscitados no espírito do professor quando se apercebeu da incapacidade dos estudantes em “verem” (= reconhecerem os habitantes do bairro. O problemático surgiu quando esta experiência demonstrou que a formação humanista dos educadores sociais que se pretende alcançar ao longo do curso ainda não estava assumida. A partir desta constatação, e socorrendo-se do losango de problematização sugerido por Fabre & Musquer (2009, o docente optou por uma abordagem de ensino centrada numa epistemologia moral que realçasse as formas de olhar com indiferença ou eivadas de estereótipos ‘através de outrem’, sem levar em consideração o sujeito no seu estatuto de pessoa. Pretende futuramente retirar dos ferimentos morais (inconscientemente infligidos pelos estudantes aos habitantes ‘invisíveis’ os princípios morais do conceito de reconhecimento que, para o ser, requer a aprendizagem de uma certa literacia moral, especialmente dos educadores sociais.This article describes an experience that occurred in when teaching students of the social education degree, whom, after having conducted an anthropological investigation in a neighborhood of Oporto based on the concept of “non-places” of Marc Augé, continued not “seeing” and “recognizing” the people, who remained faceless and nameless in the specific transcripts and speeches of these

  4. Antecedents of Teachers Fostering Effort within Two Different Management Regimes: An Assessment-Based Accountability Regime and Regime without External Pressure on Results

    Science.gov (United States)

    Christophersen, Knut-Andreas; Elstad, Eyvind; Turmo, Are

    2012-01-01

    This article focuses on the comparison of organizational antecedents of teachers' fostering of students' effort in two quite different accountability regimes: one management regime with an external-accountability system and one with no external accountability devices. The methodology involves cross-sectional surveys from two different management…

  5. Dynamic portfolio optimization across hidden market regimes

    DEFF Research Database (Denmark)

    Nystrup, Peter; Madsen, Henrik; Lindström, Erik

    2017-01-01

    Regime-based asset allocation has been shown to add value over rebalancing to static weights and, in particular, reduce potential drawdowns by reacting to changes in market conditions. The predominant approach in previous studies has been to specify in advance a static decision rule for changing...... the allocation based on the state of financial markets or the economy. In this article, model predictive control (MPC) is used to dynamically optimize a portfolio based on forecasts of the mean and variance of financial returns from a hidden Markov model with time-varying parameters. There are computational...... than a buy-and-hold investment in various major stock market indices. This is after accounting for transaction costs, with a one-day delay in the implementation of allocation changes, and with zero-interest cash as the only alternative to the stock indices. Imposing a trading penalty that reduces...

  6. The metabolic regimes of flowing waters

    Science.gov (United States)

    Bernhardt, Emily S.; Heffernan, Jim B.; Grimm, Nancy B.; Stanley, Emily H.; Harvey, Judson; Arroita, M.; Appling, Alison; Cohen, M.J.; McDowell, William H.; Hall, R.O.; Read, Jordan S.; Roberts, B.J.; Stets, Edward; Yackulic, Charles B.

    2018-01-01

    The processes and biomass that characterize any ecosystem are fundamentally constrained by the total amount of energy that is either fixed within or delivered across its boundaries. Ultimately, ecosystems may be understood and classified by their rates of total and net productivity and by the seasonal patterns of photosynthesis and respiration. Such understanding is well developed for terrestrial and lentic ecosystems but our understanding of ecosystem phenology has lagged well behind for rivers. The proliferation of reliable and inexpensive sensors for monitoring dissolved oxygen and carbon dioxide is underpinning a revolution in our understanding of the ecosystem energetics of rivers. Here, we synthesize our current understanding of the drivers and constraints on river metabolism, and set out a research agenda aimed at characterizing, classifying and modeling the current and future metabolic regimes of flowing waters.

  7. Quality Regimes in Agro-Food Industries

    DEFF Research Database (Denmark)

    Staricco, Juan Ignacio; Ponte, Stefano

    2015-01-01

    In this article, we examine the transformative potential of changing quality regimes in agro-food industries through the analysis of whether Fair Trade wine in Argentina provides a meaningful economic alternative that goes beyond the impact it has on direct beneficiaries. The wine sector has a long...... history in valorizing a variety of quality dimensions, and has developed one of the most complex and sophisticated quality infrastructures, making it an ideal terrain of analysis. Furthermore, it is going through a major process of restructuring in which the battle-lines are drawn along the application......, challenge and re-interpretation of different quality content. Through the lenses of a sector-adjusted version of regulation theory, we show that the Fair Trade wine sector does not substantially deviate from the conventional wine economy in Argentina. Instead of empowering the most vulnerable groups, those...

  8. Alumina strength degradation in the elastic regime

    International Nuclear Information System (INIS)

    Furnish, Michael D.; Chhabildas, Lalit C.

    1998-01-01

    Measurements of Kanel et al. [1991] have suggested that deviatoric stresses in glasses shocked to nearly the Hugoniot Elastic Limit (HEL) relax over a time span of microseconds after initial loading. 'Failure' (damage) waves have been inferred on the basis of these measurements using time-resolved manganin normal and transverse stress gauges. Additional experiments on glass by other researchers, using time-resolved gauges, high-speed photography and spall strength determinations have also lead to the same conclusions. In the present study we have conducted transmitted-wave experiments on high-quality Coors AD995 alumina shocked to roughly 5 and 7 GPa (just below or at the HEL). The material is subsequently reshocked to just above its elastic limit. Results of these experiments do show some evidence of strength degradation in the elastic regime

  9. Random nanolasing in the Anderson localized regime

    DEFF Research Database (Denmark)

    Liu, Jin; Garcia, P. D.; Ek, Sara

    2014-01-01

    The development of nanoscale optical devices for classical and quantum photonics is affected by unavoidable fabrication imperfections that often impose performance limitations. However, disorder may also enable new functionalities, for example in random lasers, where lasing relies on random...... multiple scattering. The applicability of random lasers has been limited due to multidirectional emission, lack of tunability, and strong mode competition with chaotic fluctuations due to a weak mode confinement. The regime of Anderson localization of light has been proposed for obtaining stable multimode...... random lasing, and initial work concerned macroscopic one-dimensional layered media. Here, we demonstrate on-chip random nanolasers where the cavity feedback is provided by the intrinsic disorder. The strong confinement achieved by Anderson localization reduces the spatial overlap between lasing modes...

  10. Il futuro regime dei tassi di cambio.

    Directory of Open Access Journals (Sweden)

    J. WILLIAMSON

    2014-08-01

    Full Text Available When the Committee of Twenty decided to rename the exchange-rate regime rather than reform it, some two weeks after the system had collapsed, it immediately became clear that the ambitious attempt to write a new monetary constitution for the world had failed. If future attempts to reform world monetary relations are not to be equally doomed to failure, a primary requirement is a more realistic approach to this central issue. Accordingly, this paper is devoted to a consideration of the type of approach that wold be required. The author considers what solutions are feasible, managed floating versus crawling par values, the reference rate proposal and reference rates as the basis for a reformed system. JEL: E42, F33

  11. Nonadiabatic effects in the Quantum Hall regime

    International Nuclear Information System (INIS)

    Page, D.A.; Brown, E.

    1993-01-01

    The authors consider the effect of a finite electric field on the states of a Bloch electron in two dimensions, with a uniform magnetic field present. They make use of the concept of electric time translation symmetry and treat the electric and magnetic fields symmetrically in a time dependent formalism. In addition to a wave vector k, the states are characterized by a frequency specifying the behavior under electric time translations. An effective Hamiltonian is employed to obtain the splitting of an isolated Bloch band into open-quotes frequencyclose quotes subbands. The time-averaged velocity and energy of the states are expressed in terms of the frequency dispersion. The relationship to the Stark ladder eigenstates in a scalar potential representation of the electric field is examined. This is seen to justify the use of the averaged energy in determining occupation of the states. In the weak electric field (adiabatic) limit, an expression is recovered for the quantized Hall conductivity of a magnetic subband as a topological invariant. A numerical procedure is outlined and results obtained over a range of electric field strengths. A transition between strong and weak field regimes is seen, with level repulsions between the frequencies playing an important role. The numerical results show how the magnetic subband structure and quantized Hall conductivity emerge as the electric field becomes weaker. In this regime, the behavior can be understood by comparison to the predictions of the adiabatic approximation. The latter predicts crossings in the frequencies at certain locations in wave vector space. Nonadiabatic effects are seen to produce gaps in the frequency spectrum at these locations. 35 refs., 14 figs

  12. The role of the media in establishing international security regimes

    Directory of Open Access Journals (Sweden)

    Chanan Naveh

    2005-04-01

    Full Text Available This article focuses primarily on the media's impact on international security regimes. It explores the ways in which the media affect the lifecycles of international regimes, from the time they are first conceived of, through their establishment, consolidation and stabilization, up until their ultimate demise. Although this paper highlights the media's role in the evolution of security regimes, it is clear that, regardless of the regime in question, media play a role throughout the lifecycle of all international regimes, whatever their character. In order to analyze the relationships of the media with security regimes in general, and specifically their contribution to each stage in their development, the article utilizes methodologies from the field of communication studies. It examines the media's agenda, "news values" and various functions, and their ability to mobilize public support for the particular issue of the regime. To date, most studies have explored the interaction between media communication patterns and global developments at the state level, or in relation to the formulation of foreign policy, while largely ignoring the international dimension of the relationship. This article attempts to remedy this situation, and the relevant processes are analysed in a case study of the anti-Iraq international security regime. It should be noted that although the paper focuses on the specific anti-Iraqi regime, it is part of a more general Anti-Rogue actors regime which includes the war against global terrorism. The study of the development of the anti-Iraq press-security regime teaches us that during international crises the media mobilize and unanimously support the regime fighting the "bad guys." But, when the regime develops and enters disputed turfs and begins to lose its legitimacy, media support diminishes, and the media may even develop into an opposing force and may join the actors fighting against this regime. Moreover, the study of

  13. Misalignment under different exchange rate regimes: the case of Turkey

    OpenAIRE

    Dağdeviren, Sengül; Ogus Binatli, Ayla; Sohrabji, Niloufer

    2011-01-01

    The paper examines misalignment of the Turkish lira between 1998 to 2008. Misalignment, specifically overvaluation has been linked to fixed exchange rate regimes. By studying the case of Turkey during this period which covers both a fixed and floating exchange rate regime, we contribute to the literature on the relation between misalignment and exchange rate regimes. We first estimate the equilibrium real exchange rate for Turkey, then compute misalignment and finally test for structural brea...

  14. Exchange-rate regimes and economic growth: An empirical evaluation

    OpenAIRE

    Simón Sosvilla-Rivero; María del Carmen Ramos-Herrera

    2014-01-01

    Based on a dataset of 123 economies, this paper empirically investigates the relation between exchange-rate regimes and economic growth. We find that growth performance is best under intermediate exchange rate regimes, while the smallest growth rates are associated with flexible exchange rates. Nevertheless, this conclusion is tempered when we analyze the countries by income level: even though countries that adopt intermediate exchange-rate regimes are characterized by higher economic growth,...

  15. Effectiveness of Existing International Nuclear Liability Regime

    International Nuclear Information System (INIS)

    Al-Doais, Salwa; Kessel, Daivd

    2015-01-01

    The first convention was the Paris Convention on Third Party Liability in the Field of Nuclear Energy (the Paris Convention) had been adopted on 29 July 1960 under the auspices of the OECD, and entered into force on 1 April 1968. In 1963,the Brussels Convention - supplementary to the Paris Convention- was adopted in to provide additional funds to compensate damage as a result of a nuclear incident where Paris Convention funds proved to be insufficient. The IAEA's first convention was the Vienna Convention on Civil Liability for Nuclear Damage (the Vienna Convention) which adopted on 21 May 1963,and entered into force in 1977. Both the Paris Convention and the Vienna Convention laid down very similar nuclear liability rules based on the same general principles. The broad principles in these conventions can be summarized as follows: 1- The no-fault liability principle (strict liability) 2- Liability is channeled exclusively to the operator of the nuclear installation (legal channeling) 3- Only courts of the state in which the nuclear accident occurs would have jurisdiction (exclusive jurisdiction) 4- Limitation of the amount of liability and the time frame for claiming damages (limited liability) 5- The operator is required to have adequate insurance or financial guarantees to the extent of its liability amount (liability must be financially secured). 6- Liability is limited in time. Compensation rights are extinguished after specific time. 7- Non-discrimination of victims on the grounds of nationality, domicile or residence. Nuclear liability conventions objective is to provide adequate compensation payments to victims of a nuclear accident. Procedures for receiving these compensation are controlled by some rules such as exclusive jurisdiction, that rule need a further amendment to ensure the effectiveness of the exiting nuclear liability regime . Membership of the Conventions is a critical issue, because the existence of the conventions without being party to

  16. Effectiveness of Existing International Nuclear Liability Regime

    Energy Technology Data Exchange (ETDEWEB)

    Al-Doais, Salwa; Kessel, Daivd [KEPCO International Nuclear Graduate School, Daejeon (Korea, Republic of)

    2015-10-15

    The first convention was the Paris Convention on Third Party Liability in the Field of Nuclear Energy (the Paris Convention) had been adopted on 29 July 1960 under the auspices of the OECD, and entered into force on 1 April 1968. In 1963,the Brussels Convention - supplementary to the Paris Convention- was adopted in to provide additional funds to compensate damage as a result of a nuclear incident where Paris Convention funds proved to be insufficient. The IAEA's first convention was the Vienna Convention on Civil Liability for Nuclear Damage (the Vienna Convention) which adopted on 21 May 1963,and entered into force in 1977. Both the Paris Convention and the Vienna Convention laid down very similar nuclear liability rules based on the same general principles. The broad principles in these conventions can be summarized as follows: 1- The no-fault liability principle (strict liability) 2- Liability is channeled exclusively to the operator of the nuclear installation (legal channeling) 3- Only courts of the state in which the nuclear accident occurs would have jurisdiction (exclusive jurisdiction) 4- Limitation of the amount of liability and the time frame for claiming damages (limited liability) 5- The operator is required to have adequate insurance or financial guarantees to the extent of its liability amount (liability must be financially secured). 6- Liability is limited in time. Compensation rights are extinguished after specific time. 7- Non-discrimination of victims on the grounds of nationality, domicile or residence. Nuclear liability conventions objective is to provide adequate compensation payments to victims of a nuclear accident. Procedures for receiving these compensation are controlled by some rules such as exclusive jurisdiction, that rule need a further amendment to ensure the effectiveness of the exiting nuclear liability regime . Membership of the Conventions is a critical issue, because the existence of the conventions without being party to

  17. Experimental study of steam condensation regime map for simplified spargers

    International Nuclear Information System (INIS)

    Kim, Y. S.; Yoon, Y. J.; Song, C. H.; Park, C. K.; Kang, H. S.; Jun, H. K.

    2003-01-01

    An experimental study was conducted to produce a condensation regime map for single-hole and 4-hole steam spargers using GIRLS facility. The regime map for a single-hole sparger was derived using parameters such as the frequency and magnitude of the dynamic pressure. For 4-hole sparager, the regime map was derived using the trends of sound and dynamic pressure. Using the single-hole and 4-hole data, a steam jet condensation regime map was suggested with respect to pool temperature and steam mass flux

  18. Institutional design and regime effectiveness in transboundary river management – the Elbe water quality regime

    Directory of Open Access Journals (Sweden)

    I. Dombrowsky

    2008-02-01

    Full Text Available The literature on transboundary river management suggests that institutions play an important role in bringing about cooperation. However, knowledge about how such institutions should be designed in order to do so remains limited. One way to learn more about adequate institutional design is to assess the effectiveness of existing regimes, and to trace the causal relationships that lead to the respective outcomes. In order to gain further insights into the relationship between institutional design and regime effectiveness, this paper presents a study on the water quality regime of the International Commission for the Protection of the Elbe (ICPE. The analysis is based on a review of pertinent documents and ten qualitative interviews with Czech and German Commission members and NGO representatives. Particular emphasis has been put on determining the ICPE's specific contribution and the no-regime counterfactual as well as on the perceived expediency of the institutional arrangements. The study shows overall that the countries were relatively successful in improving water quality in the Elbe basin. However, this outcome can only partly be attributed to the ICPE itself. Furthermore, the ICPE's contribution towards achieving the various goals varied significantly between the different areas of activity: it was relatively significant where the main responsibility for action lay with the public authorities, such as in the area of wastewater treatment and the establishment of an international alarm plan and model, but was practically non-existent in the reduction of non-point pollution from agriculture, where success depended on the behavior of individual private actors (farmers. The commission contributed towards problem solving by serving as a forum for the joint identification of priorities for action from a basin-wide perspective. The resulting international obligations increased the power of national water administrations and their access to funds

  19. Oil and gas fiscal regime review

    International Nuclear Information System (INIS)

    1993-04-01

    Poor levels of oil and gas industry profitability, declining activity, and increasing provincial budgetary pressures led to formation of a joint government/industry committee to review fiscal systems in the oil and gas industry and identify areas for potential change. An overview is presented of the development of oil and gas resources in Saskatchewan, showing that reserves and production peaked in 1966. Although reserves and production declined steadily until the early 1980s, some growth has occurred in the past decade, largely due to the influence of horizontal drilling. The province's oil and gas royalty structure is then summarized, giving the classes of oil and gas production and the royalty applicable to each class, as well as incentives available to encourage exploration and development activity. Opportunities for increased exploration and development are identified in two categories (existing wells and new wells) and impacts of possible changes in the existing royalty and incentive regime are discussed. Recommendations are provided to promote new capital investment in the industry and to extend the economic life of existing wells which are at or near the point of abandonment or suspension. 40 figs., 16 tabs

  20. Are Some Technologies Beyond Regulatory Regimes?

    Energy Technology Data Exchange (ETDEWEB)

    Jones, Wendell B. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Kusnezov, Dimitri [National Nuclear Security Administration (NNSA), Washington, DC (United States)

    2017-08-01

    Regulatory frameworks are a common tool in governance to incent and coerce behaviors supporting national or strategic stability. This includes domestic regulations and international agreements. Though regulation is always a challenge, the domain of fast evolving threats, like cyber, are proving much more difficult to control. Many discussions are underway searching for approaches that can provide national security in these domains. We use game theoretic learning models to explore the question of strategic stability with respect to the democratization of certain technologies (such as cyber). We suggest that such many-player games could inherently be chaotic with no corresponding (Nash) equilibria. In the absence of such equilibria, traditional approaches, as measures to achieve levels of overall security, may not be suitable approaches to support strategic stability in these domains. Altogether new paradigms may be needed for these issues. At the very least, regulatory regimes that fail to address the basic nature of the technology domains should not be pursued as a default solution, regardless of success in other domains. In addition, the very chaotic nature of these domains may hold the promise of novel approaches to regulation.

  1. Flow regimes in a trapped vortex cell

    Science.gov (United States)

    Lasagna, D.; Iuso, G.

    2016-03-01

    This paper presents results of an experimental investigation on the flow in a trapped vortex cell, embedded into a flat plate, and interacting with a zero-pressure-gradient boundary layer. The objective of the work is to describe the flow features and elucidate some of the governing physical mechanisms, in the light of recent investigations on flow separation control using vortex cells. Hot-wire velocity measurements of the shear layer bounding the cell and of the boundary layers upstream and downstream are reported, together with spectral and correlation analyses of wall-pressure fluctuation measurements. Smoke flow visualisations provide qualitative insight into some relevant features of the internal flow, namely a large-scale flow unsteadiness and possible mechanisms driving the rotation of the vortex core. Results are presented for two very different regimes: a low-Reynolds-number case where the incoming boundary layer is laminar and its momentum thickness is small compared to the cell opening, and a moderately high-Reynolds-number case, where the incoming boundary layer is turbulent and the ratio between the momentum thickness and the opening length is significantly larger than in the first case. Implications of the present findings to flow control applications of trapped vortex cells are also discussed.

  2. Legal regime of water management facilities

    Directory of Open Access Journals (Sweden)

    Salma Jožef

    2013-01-01

    Full Text Available The paper analyzes the legal regime of water management facilities in the light of Serbian, foreign and European law. Different divisions of water management facilities are carried out (to public and private ones, natural and artificial ones, etc., with determination of their legal relevance. Account is taken of the issue of protection from harmful effects of waters to such facilities, as well. The paper points also to rules on the water management facilities, from acts of planning, to individual administrative acts and measures for maintenance of required qualitative and quantitative condition of waters, depending on their purpose (general use or special, commercial use o waters. Albeit special rules on water management facilities exist, due to the natural interlocking between all the components of the environment (water, air and soil, a comprehensive approach is required. A reference is made to other basic principles of protection of water management facilities as well, such as the principle of prevention, principle of sustainable development and the principle "polluter pays". The last one represents the achievement of contemporary law, which deviates from the idea accepted in the second half of 20th century that supported the socialization of risk from harmful effects of waters.

  3. Electricity transport regimes: their impact on cogeneration

    Energy Technology Data Exchange (ETDEWEB)

    Cotard, Erwan [COGEN, Europe (Belgium)

    2000-12-01

    In many cases the main product of cogeneration is heat and the surplus electricity is sold to the grid. However, the economics of cogeneration can be influenced by transport networks (transmission and distribution): the structure of network pricing is relatively new. In a recent note from COGEN Europe it was recommended that cogenerators who use only the local distribution system should not pay for the transmission system and that tariffs should be structured in sufficient detail for the advantages of decentralisation to be realised. The article is presented under the sub-headings of (i) why is this important? (the omission of the transmission element reduces the overall price of cogeneration); (ii) the advantages of decentralised cogeneration; (iv) the theory - the different systems (the European Directive on electricity market liberalization); (v) the options for transport fees; (vi) current regimes in some EU states (vii) the case of transborder transport; impact of each system on cogeneration; recommendations to policymakers; (viii) the Netherlands and (ix) the UK.

  4. On the ontological emergence from quantum regime

    Energy Technology Data Exchange (ETDEWEB)

    Luty, Damian [Adam Mickiewicz University, Poznan (Poland)

    2014-07-01

    There are several views on the relation between quantum physics and theory of relativity (especially General Relativity, GR). A popular perspective is this: GR with its macroscopic gravitational effects will turn out to be a limit of a more fundamental theory which should consider discrete physics and not deal with continuity (like theory of relativity). Thus, GR will emerge from a more basic theory, which should be quantum-like. One could call this an epistemic emergence view towards fundamental theories. The question is, given that scientific realism is valid: should emergence be a fundamental notion in our ontological view about the evolving, physical Universe? Is there an ontological emergence fully compatible with the notion of fundamentality? I argue that if we want to defend ontological emergence (from quantum to macroscopic regime) as something fundamental, we will arrive at the position of metaphysics of dispositions (and I argue, why this is undesirable), or conclude, that we cannot square fully fundamental ontology with the notion of emergence, and that we have to accept an ontological pluralism relativised to a certain scale. I defend the latter proposition, showing, that epistemic emergence doesn't entail (logically) ontological emergence.

  5. Revamp urged for Norway's offshore regime

    International Nuclear Information System (INIS)

    Anon.

    1991-01-01

    This paper reports that the Norwegian government has come under renewed pressure from offshore operators to fine tune its licensing procedures and tax regime. The need for change was emphasized at the Advanced Petroleum Conference in Stavanger attended by senior personnel from companies active in the Norwegian and British sectors of the North Sea. Companies have had some success in the tax front, winning changes in proposals from Norway's Ministry of Finance for offshore tax reform. The changes were required to offset a general reduction in the corporate tax to 28% from 50.8%. Norsk Shell has told the government that in view of uncertainty about taxes it will not take part in the normal industry-government discussions about what acreage should be included in the 14th licensing round to be announced next year. This action does not bar Shell from participating in the licensing round when it gets under way. Shell has the if the tax package is not changed sharply in its passage through Storting it is unlikely to bid for new licenses

  6. On spinfoam models in large spin regime

    International Nuclear Information System (INIS)

    Han, Muxin

    2014-01-01

    We study the semiclassical behavior of Lorentzian Engle–Pereira–Rovelli–Livine (EPRL) spinfoam model, by taking into account the sum over spins in the large spin regime. We also employ the method of stationary phase analysis with parameters and the so-called, almost analytic machinery, in order to find the asymptotic behavior of the contributions from all possible large spin configurations in the spinfoam model. The spins contributing the sum are written as J f = λj f , where λ is a large parameter resulting in an asymptotic expansion via stationary phase approximation. The analysis shows that at least for the simplicial Lorentzian geometries (as spinfoam critical configurations), they contribute the leading order approximation of spinfoam amplitude only when their deficit angles satisfy γ Θ-ring f ≤λ −1/2 mod 4πZ. Our analysis results in a curvature expansion of the semiclassical low energy effective action from the spinfoam model, where the UV modifications of Einstein gravity appear as subleading high-curvature corrections. (paper)

  7. Diseño e implementación de un nodo con portal cautivo aplicado a redes Wi-fi en software libre

    OpenAIRE

    Roque Tito, Edwin

    2010-01-01

    Un Portal Cautivo es un programa de una red informática que vigila el tráfico HTTP y fuerza a los usuarios de una red a garantizar su acceso a las funciones de la red Wi-Fi, así como navegar por Internet de forma normal; el presente trabajo de investigación aplicada se tituló "Diseño e Implementación de un Nodo con Portal Cautivo Aplicado a Redes Wi-Fi en Software Libre", y se localizó en la ciudad de Puno, con la finalidad de, habilitar acceso seguro a la red para usuarios, mediante un Web B...

  8. Análisis del valor agregado del conocimiento. Caso aplicado en una institución de educación superior

    Directory of Open Access Journals (Sweden)

    PAULA ANDREA MOLINA PARRA

    2010-01-01

    Full Text Available Este artículo trata el tema del capital intelectual de una organización, el cual es un concepto pocas veces analizado por las empresas, presentando una herramienta practica de valoración del mismo como lo es el Modelo Knowledge Value Added (KVA, del cual se presenta una amplia concepción teórica. Se muestra un caso de estudio aplicado a una empresa del sector educativo colombiano de cómo aplicar dicha metodología para la valoración del capital intelectual y finalmente, a partir de los resultados encontrados en el caso de estudio, se proponen algunas de las políticas estratégicas que se deberían tener en cuenta a futuro para organizar, equilibrar y optimizar la estructura actual de la empresa donde se realizo la aplicación del modelo.

  9. Bio-geoindicadores aplicados ao ecoturismo em Unidades de Conservação localizadas em espaços urbanos

    OpenAIRE

    Fidélis, Joyce Ferreira Macedo de Andrade; Centro Universitário do Estado do Pará, Belém, PA; Lima, Sérgio Queirós; Universidade Federal do Pará, Belém, PA; Lima, Aline Maria Meiguins de; Universidade Federal do Pará, Belém, PA; Krag, Márcia Nágem; Universidade Federal Rural da Amazônia, Belém, PA; Guerreiro, Quêzia Leandro de Moura; Universidade Federal do Pará, Belém, PA

    2015-01-01

    As Unidades de Conservação são áreas que visam à proteção da biodiversidade e dos recursos naturais, sua ligação com as práticas de ecoturismo dão suporte ao manejo dessas áreas, uma vez que esta é uma atividade que visa à aproximação dos visitantes e da população do entorno. O presente trabalho teve como objetivo identificar os bio-geoindicadores aplicados ao planejamento de ecoturismo em unidades de conservação localizadas na Região Metropolitana de Belém – Pará (RMB). O método adotado foi ...

  10. Efeito de herbicidas aplicados em solo de várzea sobre a cultura do girassol Effect of herbicides applied on sunflower crop in wetland soil

    Directory of Open Access Journals (Sweden)

    E.A.L Erasmo

    2010-12-01

    Full Text Available Objetivou-se neste trabalho avaliar em solos de várzea o efeito de herbicidas préemergentes, aplicados isoladamente e em mistura, sobre a cultura do girassol. A variedade de girassol Embrapa V122 e o híbrido triplo Agrobel 972 foram avaliados individualmente, utilizando-se o delineamento experimental de blocos casualizados, com quatro repetições. Foram realizados dois experimentos, e os tratamentos utilizados em ambos foram: oxadiazon (250 g ha-1, oxyfluorfen (240 g ha-1, S-metolachlor (1.440 g ha-1, flumetsulam (120 g ha-1, pendimethalin (1.000 g ha-1, oxyfluorfen+S-metolachlor (192+960 g ha-1, flumetsulam +S-metolachlor (72+960 g ha-1, pendimethalin+S-metolachlor (1.000 + 1.440 g ha-1, pendimethalin+flumetsulam (1.000+72 g ha-1, além de duas testemunhas, sem e com capina. Os dados de altura de planta, diâmetro do caule, diâmetro do capítulo e da produção de grãos foram submetidos aos testes estatísticos multivariados de análise de agrupamento e análise de componentes principais. Os resultados foram semelhantes em ambos os cultivares, com a formação de três grupos principais, sendo o primeiro e o segundo constituídos pelas testemunhas sem e com capina, respectivamente. O terceiro grupo foi constituído pelos herbicidas aplicados isoladamente e em mistura. Dessa forma, verificou-se que os efeitos causados pelos herbicidas aplicados isoladamente e em mistura sobre as variáveis analisadas foram menos prejudiciais em relação aos da interferência das plantas daninhas. Esses resultados evidenciaram potencial de seletividade dos herbicidas aplicados isoladamente e em mistura na variedade de girassol Embrapa V122 e no híbrido triplo Agrobel 972, nas condições em que foram avaliados.This study aimed to evaluate the effect of applying different pre-emergent herbicides, alone and in combination, on sunflower crop in wetland soil. The sunflower variety Embrapa V122 and the triple hybrid Agrobel 972 were evaluated individually

  11. Sistemas distribuídos aplicados à compressão e recuperação de imagens - DOI: 10.4025/actascitechnol.v30i1.3178

    Directory of Open Access Journals (Sweden)

    Fabio Jorge Assad Gostaldon

    2008-05-01

    Sistemas distribuídos aplicados à compressão e recuperação de imagens by Eduem is licensed under a Creative Commons Atribuição-Uso Não-Comercial-Vedada a Criação de Obras Derivadas 2.5 Brasil License.Based on a work at periodicos.uem.br.

  12. Political regime change, economic liberalization and growth accelerations

    NARCIS (Netherlands)

    Jong-A-Pin, Richard; De Haan, Jakob

    We examine whether the type of political regime, regime changes, and economic liberalization are related to economic growth accelerations. Our results show that growth accelerations are preceded by economic liberalizations. We also find that growth accelerations are less likely to happen the longer

  13. Transition to ballistic regime for heat transport in helium II

    Energy Technology Data Exchange (ETDEWEB)

    Sciacca, Michele, E-mail: michele.sciacca@unipa.it [Dipartimento Scienze Agrarie e Forestali, Università degli studi di Palermo, Viale delle Scienze, 90128 Palermo (Italy); Departament de Física, Universitat Autònoma de Barcelona, 08193 Bellaterra, Catalonia (Spain); Sellitto, Antonio, E-mail: ant.sellitto@gmail.com [Dipartimento di Matematica, Informatica ed Economia, Università della Basilicata, Campus Macchia Romana, 85100 Potenza (Italy); Jou, David, E-mail: david.jou@uab.cat [Departament de Física, Universitat Autònoma de Barcelona, 08193 Bellaterra, Catalonia (Spain); Institut d' Estudis Catalans, Carme 47, 08001 Barcelona, Catalonia (Spain)

    2014-07-04

    The size-dependent and flux-dependent effective thermal conductivity of narrow capillaries filled with superfluid helium is analyzed from a thermodynamic continuum perspective. The classical Landau evaluation of the effective thermal conductivity of quiescent superfluid, or the Gorter–Mellinck regime of turbulent superfluids, is extended to describe the transition to ballistic regime in narrow channels wherein the radius R is comparable to (or smaller than) the phonon mean-free path ℓ in superfluid helium. To do so, we start from an extended equation for the heat flux incorporating non-local terms, and take into consideration a heat slip flow along the walls of the tube. This leads from an effective thermal conductivity proportional to R{sup 2} (Landau regime) to another one proportional to Rℓ (ballistic regime). We consider two kinds of flows: along cylindrical pipes and along two infinite parallel plates. - Highlights: • Heat transport in counterflow helium in the ballistic regime. • The one-fluid model based on the Extended Thermodynamics is used. • The transition from the Landau regime to the ballistic regime. • The transition from quantum turbulence to ballistic regime.

  14. Minxin Pei, China's Crony Capitalism: The Dynamics of Regime Decay

    DEFF Research Database (Denmark)

    Brødsgaard, Kjeld Erik

    2017-01-01

    Book review of: Minxin Pei, China's Crony Capitalism: The Dynamics of Regime Decay. Cambridge, Mass.: Harvard University Press, 2016. 365 pp., including references and index. ISBN 9780674737297.......Book review of: Minxin Pei, China's Crony Capitalism: The Dynamics of Regime Decay. Cambridge, Mass.: Harvard University Press, 2016. 365 pp., including references and index. ISBN 9780674737297....

  15. Global regime shift dynamics of catastrophic sea urchin overgrazing

    Science.gov (United States)

    Ling, S. D.; Scheibling, R. E.; Rassweiler, A.; Johnson, C. R.; Shears, N.; Connell, S. D.; Salomon, A. K.; Norderhaug, K. M.; Pérez-Matus, A.; Hernández, J. C.; Clemente, S.; Blamey, L. K.; Hereu, B.; Ballesteros, E.; Sala, E.; Garrabou, J.; Cebrian, E.; Zabala, M.; Fujita, D.; Johnson, L. E.

    2015-01-01

    A pronounced, widespread and persistent regime shift among marine ecosystems is observable on temperate rocky reefs as a result of sea urchin overgrazing. Here, we empirically define regime-shift dynamics for this grazing system which transitions between productive macroalgal beds and impoverished urchin barrens. Catastrophic in nature, urchin overgrazing in a well-studied Australian system demonstrates a discontinuous regime shift, which is of particular management concern as recovery of desirable macroalgal beds requires reducing grazers to well below the initial threshold of overgrazing. Generality of this regime-shift dynamic is explored across 13 rocky reef systems (spanning 11 different regions from both hemispheres) by compiling available survey data (totalling 10 901 quadrats surveyed in situ) plus experimental regime-shift responses (observed during a total of 57 in situ manipulations). The emergent and globally coherent pattern shows urchin grazing to cause a discontinuous ‘catastrophic’ regime shift, with hysteresis effect of approximately one order of magnitude in urchin biomass between critical thresholds of overgrazing and recovery. Different life-history traits appear to create asymmetry in the pace of overgrazing versus recovery. Once shifted, strong feedback mechanisms provide resilience for each alternative state thus defining the catastrophic nature of this regime shift. Importantly, human-derived stressors can act to erode resilience of desirable macroalgal beds while strengthening resilience of urchin barrens, thus exacerbating the risk, spatial extent and irreversibility of an unwanted regime shift for marine ecosystems.

  16. Equilibrium current-driven tearing mode in the hydrodynamic regime

    International Nuclear Information System (INIS)

    Cozzani, F.; Mahajan, S.

    1984-12-01

    The effect of the parallel equilibrium current on the linear stability of the drift-tearing mode in the collisional regime is investigated analytically. In the appropriate parameter regime, a new unstable mode, driven by equilibrium current, is found and its relevance to tokamak discharges is discussed

  17. Welfare regimes and the incentives to work and get educated

    NARCIS (Netherlands)

    Rodriguez-Pose, Andres; Tselios, Vassilis

    This paper examines whether differences in welfare regimes shape the incentives to work and get educated. Using microeconomic data for more than 100 ON European individuals, we show that welfare regimes make a difference for wages and education. First, people-based and household-based effects

  18. Influence of curing regimes on compressive strength of ultra high

    Indian Academy of Sciences (India)

    The present paper is aimed to identify an efficient curing regime for ultra high performance concrete (UHPC), to achieve a target compressive strength more than 150 MPa, using indigenous materials. The thermal regime plays a vital role due to the limited fineness of ingredients and low water/binder ratio. By activation of the ...

  19. Regimes of mini black hole abandoned to accretion

    Science.gov (United States)

    Paik, Biplab

    2018-01-01

    Being inspired by the Eddington’s idea, along with other auxiliary arguments, it is unveiled that there exist regimes of a black hole that would prohibit accretion of ordinary energy. In explicit words, there exists a lower bound to black hole mass below which matter accretion process does not run for black holes. Not merely the baryonic matter, but, in regimes, also the massless photons could get prohibited from rushing into a black hole. However, unlike the baryon accretion abandoned black hole regime, the mass-regime of a black hole prohibiting accretion of radiation could vary along with its ambient temperature. For example, we discuss that earlier to 10‑8 s after the big-bang, as the cosmological temperature of the Universe grew above ˜ 1014 K, the mass range of black hole designating the radiation accretion abandoned regime, had to be in varying state being connected with the instantaneous age of the evolving Universe by an “one half” power law. It happens to be a fact that a black hole holding regimes prohibiting accretion of energy is gigantic by its size in comparison to the Planck length-scale. Hence the emergence of these regimes demands mini black holes for not being viable as profound suckers of energy. Consideration of accretion abandoned regimes could be crucial for constraining or judging the evolution of primordial black holes over the age of the Universe.

  20. Smith-Purcell oscillator in an exponential gain regime

    International Nuclear Information System (INIS)

    Schachter, L.; Ron, A.

    1988-01-01

    A Smith-Purcell oscillator with a thick electron beam is analyzed in its exponential gain regime. A threshold current less than 1[A] is found for a 1 mm wavelength; this threshold is much lower than that of a similar oscillator operating in a linear gain regime

  1. How does technological regime affect performance of technology development projects?

    NARCIS (Netherlands)

    Song, Michael; Hooshangi, Soheil; Zhao, Y. Lisa; Halman, Johannes I.M.

    2014-01-01

    In this study, we examine how technological regime affects the performance of technology development projects (i.e., project quality, sales, and profit). Technological regime is defined as the set of attributes of a technological environment where the innovative activities of firms take place.

  2. Mild wear modeling in the boundary lubrication regime

    NARCIS (Netherlands)

    Bosman, Rob

    2011-01-01

    Currently, the increasing demand for smaller and more efficient systems is increasing the stress put on interacting components. This forces components to operate in the boundary lubrication regime. In this lubrication regime, the normal load put on the components is no longer carried by the

  3. How Welfare Regimes Generate and Erode Social Capital

    DEFF Research Database (Denmark)

    Larsen, Christian Albrekt

    2007-01-01

    in the USA and other liberal welfare regimes, while social capital is stable in the so-called social democratic and conservative welfare regimes. The second puzzle is why the group of social democratic regimes have extremely high levels of social trust. It is argued that both puzzles have to do......Comparative studies of social capital, operationalised as social trust between citizens, have revealed two major puzzles. The first puzzle has to do with the decline in social trust in the USA, which fuelled considerable debate about social capital. The question is why social capital erodes...... with the presence or absence of a poor and culturally distinct underclass. The social democratic welfare regimes hinder – while the liberal welfare regime generate – such underclass phenomena....

  4. Policy Ideas, Knowledge Regimes and Comparative Political Economy

    DEFF Research Database (Denmark)

    Campbell, John L.; Pedersen, Ove K.

    2015-01-01

    Despite much attention to how ideas affect policy making, where these ideas come from is a blind spot in comparative political economy. We show that an important source of policy ideas are knowledge regimes—fields of policy research organizations. We show as well that the organization of knowledge...... to restore it by transforming their knowledge regimes, albeit in ways that are still shaped by the surrounding political and economic institutions. The effectiveness of their efforts is not guaranteed. The argument is based on an analysis of the evolution of knowledge regimes since the 1970s in the USA...... regimes is heavily influenced by the organization of their surrounding political economies such that knowledge regimes have particular national characters. Furthermore, when people perceive that the utility of their knowledge regime for the rest of the political economy breaks down, they often try...

  5. About the skin effect in transient regime; Sur l'effet de peau en regime transitoire

    Energy Technology Data Exchange (ETDEWEB)

    Podliasky, I.

    1957-06-15

    Whereas always more experimental devices are using a pulsed electric supply (the electromagnetic field is applied during few microseconds only), and whereas the studied phenomenon does not last more than few microseconds, this raises the question of the behaviour in transient regime of metallic circuits or of discharge in gases. In this technical note, the author addresses the case of sufficiently high and constant gas conductivity during the studied duration. Thus, he reports a theoretical study of the establishment of a current in a high-conductivity and large-radius cylinder, and more specifically the study of the behaviour of peripheral layers (in the neighbourhood of the metal-insulator separation)

  6. Desmistificação do regime contábil de competência Debunking the accrual-basis accounting

    Directory of Open Access Journals (Sweden)

    Thiago Bernardo Borges

    2010-08-01

    Full Text Available Este artigo apresenta o regime de competência de forma simples e objetiva, e discute como pode ser aplicado às organizações públicas no Brasil. Para tanto, usa a experiência do governo do estado de Minas Gerais no processo de preparação para a adoção do regime de competência puro, que desde 2001 estuda a possibilidade de adoção do regime. Esse processo foi acelerado em 2009 pela iminência de convergência às normas internacionais de contabilidade para o setor público, demandada pela Secretaria do Tesouro Nacional e pelo Conselho Federal de Contabilidade. A análise apresenta os incentivos à iniciativa da adoção do regime, mesmo antes da exigência legal, e os potenciais impactos de tal adoção no processo decisório. O processo de reforma administrativa no caso de Minas Gerais, incentivado primariamente pela necessidade de saneamento fiscal, levou à adoção do conceito de contratualização, o que passou a demandar informação de desempenho. Apesar dos benefícios em potencial do regime de competência para decisão e accountability, o Estado necessitará enfrentar questões como capacitação, adequação de sistemas e incertezas quanto aos parâmetros da Lei de Responsabilidade FiscalThis paper presents accrual basis accounting in a straight and objective way, and how it can be applied to the Brazilian public sector. The State of Minas Gerais has been preparing itself to adopt the accrual accounting since 2001. This process has been improved since 2009 as a consequence of the joint work between the Brazilian Treasury and the National Institute of Chartered Accountants that aim to converge the Brazilian public sector accounting standards to the International Public Sector Accounting Standards. The analysis presents the incentives to the adoption of the accrual accounting, even before it becomes mandatory, and the potential effects of that adoption on decision making. The Minas Gerais public reform was a consequence of

  7. Human influence on California fire regimes.

    Science.gov (United States)

    Syphard, Alexandra D; Radeloff, Volker C; Keeley, Jon E; Hawbaker, Todd J; Clayton, Murray K; Stewart, Susan I; Hammer, Roger B

    2007-07-01

    Periodic wildfire maintains the integrity and species composition of many ecosystems, including the mediterranean-climate shrublands of California. However, human activities alter natural fire regimes, which can lead to cascading ecological effects. Increased human ignitions at the wildland-urban interface (WUI) have recently gained attention, but fire activity and risk are typically estimated using only biophysical variables. Our goal was to determine how humans influence fire in California and to examine whether this influence was linear, by relating contemporary (2000) and historic (1960-2000) fire data to both human and biophysical variables. Data for the human variables included fine-resolution maps of the WUI produced using housing density and land cover data. Interface WUI, where development abuts wildland vegetation, was differentiated from intermix WUI, where development intermingles with wildland vegetation. Additional explanatory variables included distance to WUI, population density, road density, vegetation type, and ecoregion. All data were summarized at the county level and analyzed using bivariate and multiple regression methods. We found highly significant relationships between humans and fire on the contemporary landscape, and our models explained fire frequency (R2 = 0.72) better than area burned (R2 = 0.50). Population density, intermix WUI, and distance to WUI explained the most variability in fire frequency, suggesting that the spatial pattern of development may be an important variable to consider when estimating fire risk. We found nonlinear effects such that fire frequency and area burned were highest at intermediate levels of human activity, but declined beyond certain thresholds. Human activities also explained change in fire frequency and area burned (1960-2000), but our models had greater explanatory power during the years 1960-1980, when there was more dramatic change in fire frequency. Understanding wildfire as a function of the

  8. States agree on stronger physical protection regime

    International Nuclear Information System (INIS)

    2005-01-01

    Full text: Delegates from 89 countries agreed on 8 July to fundamental changes that will substantially strengthen the Convention on the Physical Protection of Nuclear Material (CPPNM). IAEA Director General Mohamed ElBaradei welcomed the agreement in saying 'This new and stronger treaty is an important step towards greater nuclear security by combating, preventing, and ultimately punishing those who would engage in nuclear theft, sabotage or even terrorism. It demonstrates that there is indeed a global commitment to remedy weaknesses in our nuclear security regime.' The amended CPPNM makes it legally binding for States Parties to protect nuclear facilities and material in peaceful domestic use, storage as well as transport. It will also provide for expanded cooperation between and among States regarding rapid measures to locate and recover stolen or smuggled nuclear material, mitigate any radiological consequences of sabotage, and prevent and combat related offences. The original CPPNM applied only to nuclear material in international transport. Conference President Dr. Alec Baer said 'All 89 delegations demonstrated real unity of purpose. They put aside some very genuine national concerns in favour of the global interest and the result is a much improved convention that is better suited to addressing the nuclear security challenges we currently face.' The new rules will come into effect once they have been ratified by two-thirds of the 112 States Parties of the Convention, expected to take several years. 'But concrete actions are already taking place around the world. For more than 3 years, the IAEA has been implementing a systematic Nuclear Security plan, including physical protection activities designed to prevent, detect and respond to malicious acts,' said Anita Nillson, Director of the IAEA's Office of Nuclear Security. The Agency's Nuclear Security Fund, set up after the events of 9/11, has delivered $19.5 million in practical assistance to 121 countries

  9. [Heath and political regimes: presidential or parliamentary government for Colombia?].

    Science.gov (United States)

    Idrovo, Alvaro J

    2007-01-01

    Changing the presidential regime for a parliamentarian one is currently be-ing discussed in Colombia. This preliminary study explores the potential effects on health of both presidential and parliamentary regimes by using world-wide data. An ecological study was undertaken using countries from which comparable information concerning life-expectancy at birth, political regime, economic development, inequality in income, social capital (as measured by general-ised trust or Corruption Perceptions Index), political rights, civil freedom and cultural diversity could be obtained. Life-expectancy at birth and macro-determinants were compared between both political regimes. The co-relationship between these macro-determinants was estimated and the relationship between political regimen and life-expectancy at birth was estimated using robust regression. Crude analysis revealed that parliamentary countries have greater life-expectancy at birth than countries having a presidential regime. Significant co-relationships between all macro-determinants were observed. No differential effects were observed between both political regimes regarding life-expectancy at birth in multiple robust regressions. There is no evidence that presidential or parliamentary regimes provide greater levels of health for the population. It is suggested that public health policies be focused on other macro-determinants having more known effects on health, such as income inequality.

  10. An Examination of the Nature of Global MODIS Cloud Regimes

    Science.gov (United States)

    Oreopoulos, Lazaros; Cho, Nayeong; Lee, Dongmin; Kato, Seiji; Huffman, George J.

    2014-01-01

    We introduce global cloud regimes (previously also referred to as "weather states") derived from cloud retrievals that use measurements by the Moderate Resolution Imaging Spectroradiometer (MODIS) instrument aboard the Aqua and Terra satellites. The regimes are obtained by applying clustering analysis on joint histograms of retrieved cloud top pressure and cloud optical thickness. By employing a compositing approach on data sets from satellites and other sources, we examine regime structural and thermodynamical characteristics. We establish that the MODIS cloud regimes tend to form in distinct dynamical and thermodynamical environments and have diverse profiles of cloud fraction and water content. When compositing radiative fluxes from the Clouds and the Earth's Radiant Energy System instrument and surface precipitation from the Global Precipitation Climatology Project, we find that regimes with a radiative warming effect on the atmosphere also produce the largest implied latent heat. Taken as a whole, the results of the study corroborate the usefulness of the cloud regime concept, reaffirm the fundamental nature of the regimes as appropriate building blocks for cloud system classification, clarify their association with standard cloud types, and underscore their distinct radiative and hydrological signatures.

  11. Asset allocation and regime switching on Croatian financial market

    Directory of Open Access Journals (Sweden)

    Tihana Škrinjarić

    2016-12-01

    Full Text Available It has been known for quite some time now that financial markets exhibit changes in regimes over time. A majority of the literature tends to support that financial markets undergo regimes of bull and bear markets. This characteristic should be modeled in a proper way as investors are always interested in beating the market: either by achieving better returns than others, or by minimizing their portfolio risks. There exist many mathematical and statistical models that are used as tools to achieve the mentioned goals. Introducing the regime switching methodology in existing models has proven to be facilitate achieving such goals. Therefore, the objective of this study is to utilize the regime switching methodology on the Croatian financial market to ascertain its usefulness for Croatian investors. Multivariate regime switching and non-switching models were estimated using daily data from the period 2 January 2007 to 31 December 2015. The assumption is that the investor is interested in stock and bond markets. The results from the MGARCH and regime switching MGARCH models are then compared in order to give answers as to whether the respective methodology applied to the Croatian market is useful and how it may benefit investors. Most of the results support the presumption of incorporating this particular methodology in financial modeling for the Croatia markets. This is the first research that applies the regime switching MGARCH methodology in Croatia (including the Balkan region, hence we expect that this will be a significant contribution to existing methodologies in literature.

  12. Perspectives on the International and Internal Nuclear Security Regime

    International Nuclear Information System (INIS)

    Jang, Sung Soon

    2015-01-01

    The term, 'Nuclear Security' became more familiar to Korean public after the government hosted 2012 Seoul Nuclear Security Summit. Nuclear Security is prevention of, detection of and response to criminal or intentional unauthorized acts involving or directed at nuclear material, other radioactive material, associated facilities, or associated activities. Nuclear Security includes physical protection, security of radioactive sources, nuclear forensics, nuclear smuggling prevention, border monitoring, and cyber security with regard to nuclear and other radiological materials. This abstract will review recent international trends and discuss the nuclear security regime in the Republic of Korea (ROK). The international Nuclear Security Regime has been strengthened. The upcoming Chicago Summit in 2016 and the entry into force of the Amendment of Convention on Physical Protection of Nuclear Materials (CPPNM) will bring major changes in nuclear security. The Republic of Korea hosted the 2012 Seoul Summit and strengthened domestic regime to meet international standards. The ROK has worked hard to contribute to the international security regime and to establish a robust domestic security regime against terrorist threats. Even if the nuclear security regime is robust, Risk-informed Nuclear Security management should be established to meet international standards and to implement effective as well as an efficient nuclear security regime

  13. The application of neural networks to flow regime identification

    International Nuclear Information System (INIS)

    Embrechts, M.; Yapo, T.C.; Lahey, R.T. Jr.

    1993-01-01

    This paper deals with the application of a Kohonen map for the identification of two-phase flow regimes where a mixture of gas and fluid flows through a horizontal tube. Depending on the relative flow velocities of the gas and the liquid phase, four distinct flow regimes can be identified: Wavy flow, plug flow, slug flow and annular flow. A schematic of these flow regimes is presented. The objective identification of two-phase flow regimes constitutes an important and challenging problem for the design of safe and reliable nuclear power plants. Previous attempts to classify these flow regimes are reviewed by Franca and Lahey. The authors describe how a Kohonen map can be applied to distinguish between flow regimes based on the Fourier power spectra and wavelet transforms of pressure drop fluctuations. The Fourier power spectra allowed the Kohonen map to identify the flow regimes successfully. In contrast, the Kohonen maps based on a wavelet transform could only distinguish between wavy and annular flows. An analysis of typical two-phase pressure drop data for an air/water mixture in a horizontal pipe is presented. Use of the wavelet transform and the Kohonen feature map are discussed

  14. Emerging Trends in Development of International Information Security Regime

    Directory of Open Access Journals (Sweden)

    Elena S. Zinovieva

    2016-01-01

    Full Text Available The article discusses the key trends shaping the international regime on information security. International cooperation in this area at the global level encounters contradictions of state interest. The main actors of the information security are the United States, Russia, China and the EU countries (Britain, France and Germany. The main contradiction is developing between the US on one side and Russia and China on the other. EU countries occupy the middle position, gravitating to that of US. The article proves that international cooperation on information security will reflect the overall logic of the development of international cooperation, which is characterized by a new model of cooperation, with the participation of state and non-state actors, known as multi-stakeholder partnerships and multi-level cooperation. The logic of the formation of an international regime on information security is closest to the logic of the formation of the international non-proliferation regime. It is in the interest of Russia to support the trend towards regionalization of information security regime. Russia can form a regional information security regime in the former Soviet Union on the basis of the CSTO and SCO and potentially on a wider Eurasian space. Such regional regime would give Russia an opportunity to shape the international regime and closely monitor emerging information security issues in the former Soviet Union, and remove the potential threat of "color revolutions".

  15. Perspectives on the International and Internal Nuclear Security Regime

    Energy Technology Data Exchange (ETDEWEB)

    Jang, Sung Soon [Korea Nuclear Non-proliferation and Control, Daejeon (Korea, Republic of)

    2015-10-15

    The term, 'Nuclear Security' became more familiar to Korean public after the government hosted 2012 Seoul Nuclear Security Summit. Nuclear Security is prevention of, detection of and response to criminal or intentional unauthorized acts involving or directed at nuclear material, other radioactive material, associated facilities, or associated activities. Nuclear Security includes physical protection, security of radioactive sources, nuclear forensics, nuclear smuggling prevention, border monitoring, and cyber security with regard to nuclear and other radiological materials. This abstract will review recent international trends and discuss the nuclear security regime in the Republic of Korea (ROK). The international Nuclear Security Regime has been strengthened. The upcoming Chicago Summit in 2016 and the entry into force of the Amendment of Convention on Physical Protection of Nuclear Materials (CPPNM) will bring major changes in nuclear security. The Republic of Korea hosted the 2012 Seoul Summit and strengthened domestic regime to meet international standards. The ROK has worked hard to contribute to the international security regime and to establish a robust domestic security regime against terrorist threats. Even if the nuclear security regime is robust, Risk-informed Nuclear Security management should be established to meet international standards and to implement effective as well as an efficient nuclear security regime.

  16. Considerations on nonproliferation regime meeting in a changing world

    International Nuclear Information System (INIS)

    Kurihara, Hiroyoshi; Kikuchi, Masahiro

    1994-01-01

    This paper summarizes the past history of worldwide nonproliferation regime, then proposes the future improvements on the regime. Present worldwide nonproliferation regime have been formulated during the cold war era. Therefore, the structure and measures of the regime were heavily influenced by the features of cold war era. Though the cold war was over, still new international order does not seem to be on the horizon, we need to review the present regime and to improve the regime compatible to new world situation. Generally speaking, the nonproliferation regime have gained moderate success so far. We could point out the following features as a kind of success: 1) No increase of overt Nuclear Weapon State (NWS), 2) All five NWSs have finally participated to the NPT, 3) South Africa has destroyed its nuclear weapons and became Non-Nuclear Weapon State (NNWS), 4) Successful conclusions of some regional arrangements, such as Tlatelolco, Ralotonga, and 5) Strengthening of export control on sensitive items. On the other hand, we recognize the following points as the failures of the regime. 6) India, Pakistan and Israel reject to join the NPT, 7) Existence of some violation against NPT regime, i.e. Iraqi case and DPRK case, 8) Insufficient effective measures against brain drain problem, 9) Risk exists for the long term extension of NPT, and 10) Insufficient flexibility to meet changing boundary conditions. We would propose the various measures for strengthening to meet changing boundary conditions, as follows: 11) Measures to be taken along with future civil use of Plutonium, 12) Strengthening and rationalizing international safeguards, 13) Countermeasures for emerging new types of nuclear proliferation, 14) Strengthening nuclear material control in NWS, 15) Measures to be taken for nuclear material from dismantled nuclear weapons, and 16) Nuclear disarmament. (author)

  17. Flow regimes in vertical gas-solid contact systems

    Energy Technology Data Exchange (ETDEWEB)

    Yerushalmi, J.; Cankurt, N. T.; Geldart, D.; Liss, B.

    1976-01-01

    The flow characteristics in fluidized beds, i.e., gas-solid systems, was studied to determine the flow regimes, the interaction of gas and solid in the various flow regimes and the dependence of this interaction and of transition between flow regimes on the properties of the gas and solid, on the gas and solid flow rates, and on the containing vessel. Fluidized beds with both coarse and fine particles are considered. Test results using high speed photography to view the operation of a 2-dimensional bed are discussed. (LCL)

  18. Regimes of Two-Phase Flow in Short Rectangular Channel

    Science.gov (United States)

    Chinnov, Evgeny A.; Guzanov, Vladimir V.; Cheverda, Vyacheslav; Markovich, Dmitry M.; Kabov, Oleg A.

    2009-08-01

    Experimental study of two-phase flow in the short rectangular horizontal channel with height 440 μm has been performed. Characteristics of liquid motion inside the channel have been registered and measured by the Laser Induced Fluorescence technique. New information has allowed determining more precisely the characteristics of churn regime and boundaries between different regimes of two-phase flow. It was shown that formation of some two-phase flow regimes and transitions between them are determined by instability of the flow in the lateral parts of the channel.

  19. Tidal regimes and salt marshes - the River Hamble analogue

    International Nuclear Information System (INIS)

    Gray, A.J.; Moy, I.L.; Warman, E.A.; Dawson, F.H.; Henville, P.

    1993-01-01

    Construction of estuarine tidal-energy barrages has a potentially major effect on the tidal regime of the estuary, particularly upstream of a barrage. Because tidal regime largely controls the distribution and species composition of intertidal plant and animal communities, it is important to understand how barrages may affect such communities. The main objectives of the research described in this report were to relate recent changes in tidal regime within an embanked area of salt marsh and mudflat to changes in the distribution of plant species. This was to test predictions about tidal control of species' range and to assess the site's suitability as an analogue of post-barrage conditions. (author)

  20. Information management in NACD regimes: a comparative analysis

    International Nuclear Information System (INIS)

    Unger, R.

    1998-01-01

    While all non-proliferation, arms control and disarmament (NACD) regimes must address the issue of information management, this area has remained an under-explored part of the arms control field. This paper compares information management processes across a variety of NACD regimes for the purpose of identifying potential synergies between regimes and suggesting means by which to strengthen future arms control verification efforts. The paper explores the information management systems of the International Atomic Energy Agency (IAEA), the United Nations Special Commission in Iraq (UNSCOM), the Conventional Forces in Europe Agreement (CFE), and the Comprehensive Test Ban Treaty (CTBT). (author)

  1. Beta Risk and Regime Shift in Market Volatility

    OpenAIRE

    Don U.A. Galagedera; Roland G. Shami

    2004-01-01

    In this paper, we relate security returns in the thirty securities in the Dow Jones index to regime shifts in the market portfolio (S&P500) volatility. We model market volatility as a multiple-state Markov switching process of order one and estimate non-diversifiable security risk (beta) in the different market volatility regimes. We test the significance of the premium of the beta risk associated with the different market regimes and find evidence of a relationship between security return an...

  2. Kondo and mixed-valence regimes in multilevel quantum dots

    International Nuclear Information System (INIS)

    Chudnovskiy, A. L.; Ulloa, S. E.

    2001-01-01

    We investigate the dependence of the ground state of a multilevel quantum dot on the coupling to an external fermionic system and on the interactions in the dot. As the coupling to the external system increases, the rearrangement of the effective energy levels in the dot signals the transition from the Kondo regime to a mixed-valence (MV) regime. The MV regime in a two-level dot is characterized by an intrinsic mixing of the levels in the dot, resulting in nonperturbative subtunneling and supertunneling phenomena that strongly influence the Kondo effect

  3. The Displacement of Regimes of Action in the Armed Forces

    DEFF Research Database (Denmark)

    Holsting, Vilhelm Stefan

    The aim of this paper is to explore how one might approach the profession of military command using the concepts of regimes of justification by Luc Boltanski and Laurent Thévenot in an analysis of the contemporary disputes and tensions between political and professional actors and in a time where...... of their contemporary role, responsibility and challenges) and an analysis of the displacement of military regimes in the light of economic and security changes at the societal level. I am arguing that the entrance of new regimes of justification are challenging and displacing the traditional professional justificatory...

  4. The source regime for irradiation plant operated with fuel elements

    International Nuclear Information System (INIS)

    Suckow, W.

    1976-11-01

    The rapid and irregular decay of the gamma radiation from reactor fuel elements requires the establishment of an optimal source regime in order to utilise reactor fuel elements as radiation sources on a technological basis. Critical values have been derived which enable the determination of optimal conditions. In this context all technologically interesting types of source regimes have been examined. Methods to achieve a high gamma yield and a satisfactory dose consistency with time have been developed and important values for these two aspects have been derived. The conditions for optimal radiation source regimes are described in the final conclusions. (author)

  5. Early Regimes of Water Capillary Flow in Slit Silica Nanochannels

    DEFF Research Database (Denmark)

    Oyarzua, Elton; Walther, Jens Honore; Mejia, Andres

    2015-01-01

    on the dynamics of capillaryfilling. The results indicate that the nanoscale imbibition process is divided into three main flow regimes:an initial regime where the capillary force is balanced only by the inertial drag and characterized by aconstant velocity and a plug flow profile. In this regime, the meniscus...... velocity profiles identify the passage froman inviscid flow to a developing Poiseuille flow. Gas density profiles ahead of the capillary front indicatea transient accumulation of air on the advancing meniscus. Furthermore, slower capillary filling ratescomputed for higher air pressures reveal a significant...... retarding effect of the gas displaced by the advancing meniscus....

  6. The NPT regime: Progress and promises

    International Nuclear Information System (INIS)

    Dhanapala, Jayantha

    2001-01-01

    Full text: Thesis. The 'NPT regime' has arrived at a fateful crossroads. Though extended indefinitely in 1995, its future is my no means secure. The future 'progress' of this treaty will depend upon whether the 'promises' of its States parties are fully implemented and, eventually, upon the treaty's success in achieving fully universal membership. Challenges The treaty faces many short-term and longer-term challenges: Short term - The first Preparatory Committee meeting for the 2005 Review Conference will meet next year. NNWS will want to see some evidence of progress on nuclear disarmament (Art. VI), along the lines prescribed in the 13 'practical steps' agreed at the last Review Conference. Yet progress has been set back by: uncertainties over the future of the ABM Treaty; the failure of START II and the CTBT to enter into force; the lack of a FISMAT treaty and a treaty establishing a NWFZ in Central Asia; continued qualitative improvements in nuclear weapons; hints that nuclear testing may one day resume; the persistence of doctrines of first-use, pre-emptive use, and use against states that use CBW. Other compliance-related questions will arise over safeguards (e.g. the inability of the IAEA to conduct inspections in the DPRK; signs of a breakdown of the norm of full-scope IAEA safeguards, e.g. in South Asia). There are also concerns over the implementation of non-proliferation commitments (e.g. persisting allegations about nuclear weapon programmes in existing NNWS). The terrorist attacks in New York and Washington, D.C. on 11 September should also serve as a reminder of the new terrorist dangers relating to the possible use of weapons of mass destruction and unorthodox delivery systems. Longer term - Selectivity in the enforcement of NPT norms; unilateralism; IAEA funding uncertainties and shortfalls; difficulties in reaching universal membership (India, Pakistan, and Israel); continuing compliance problems with respect to both non-proliferation and

  7. Implementação de modelo para balanceamento de fluxos aplicado ao gerenciamento de tráfego aéreo

    Directory of Open Access Journals (Sweden)

    Bueno Borges de Souza

    2009-10-01

    Full Text Available

    Este trabalho descreve um sistema de auxílio à decisão com metodologias de Teoria dos Grafos e Inteligência Artificial para dar suporte ao Gerenciamento de Fluxo de Tráfego Aéreo Brasileiro. Trata-se de um modelo de gerenciamento de fluxo baseado em grafos com adaptações heurísticas para a regulação dinâmica do fluxo. O modelo fundamenta a arquitetura do Módulo de Balanceamento de Fluxo (MBF integrante do Sistema Distribuído de Apoio a Decisão aplicado ao Gerenciamento Tático do Fluxo de Tráfego(SISCONFLUX, em desenvolvimento, e tem o objetivo de melhorar o gerenciamento do espaço aéreo nacional. O MBF foi proposto para dar suporte ao sistema em operação no Primeiro Centro Integrado de Defesa Aérea e Controle de Tráfego Aéreo (CINDACTA I, fornecendo informações adicionais para o processo aplicado pelos controladores a fim de amenizar a carga de trabalho e melhorar os resultados de suas ações. Usando técnicas de maximização de fluxo adaptados da Teoria dos Grafos, o MBF foi desenvolvido como um modelo de análise que determina o tempo de separação entre decolagens a partir das terminais integrantes da Região de Informação de Vôo de Brasília (FIR-BS e distribui a folga do fluxo ao longo do espaço aéreo controlado, objetivando prevenir ou reduzir o congestionamento nos diversos setores da FIR-BS. O MBF dá suporte à regulação do fluxo de tráfego auxiliando os controladores e as outras unidades dentro do SISCONFLUX.

  8. Accountability Challenges in the Transnational Regime Complex for Climate Change

    NARCIS (Netherlands)

    Widerberg, O.E.; Pattberg, P.H.

    2017-01-01

    This article discusses challenges to accountability in the context of transnational climate governance. It argues that the emergence of a distinct transnational regime complex and the increasingly integrated structure of international and transnational climate governance create new challenges for

  9. Constructing a unitary title regime for the European Patent System

    NARCIS (Netherlands)

    Rodriguez, V.F.

    2011-01-01

    The European Patent System without any unitary title allows Member States to retain institutional arrangements within their borders and to prevent any moves to delegate responsibility outside the national sphere. This intergovernmental patent regime suffers from fragmentation due to national

  10. Regime Change in North Africa and Implications for

    African Journals Online (AJOL)

    MUMO

    networks and; the future of repressive regimes on the continent. A Conceptual ..... The former President of Burkina Faso, Thomas Sankara, once reportedly said that “power is like a bottle ..... Liberal Democracy and its Critics in Africa: Political.

  11. Influence of curing regimes on compressive strength of ultra high ...

    Indian Academy of Sciences (India)

    142 MPa with change in curing regimes. The samples ..... Guide, School of Civil and Environmental Engineering, The University of New South Wales, Sydney, ... the 5th International Conference on the Chemistry of Cement, Tokyo, Japan, pp.

  12. Economic Liberalization in Syria: Prospects for Regime Stability and Democratization

    National Research Council Canada - National Science Library

    Nelson, Dana

    1998-01-01

    From 1985 to 1991, Syria experienced a severe economic crisis. In response, the regime of Hafiz al-Asad implemented economic reforms designed to move the Syrian economy toward free-market capitalism...

  13. Nonequilibrium electron transport through quantum dots in the Kondo regime

    DEFF Research Database (Denmark)

    Wölfle, Peter; Paaske, Jens; Rosch, Achim

    2005-01-01

    Electron transport at large bias voltage through quantum dots in the Kondo regime is described within the perturbative renormalization group extended to nonequilibrium. The conductance, local magnetization, dynamical spin susceptibility and local spectral function are calculated. We show how...

  14. Regime-Switching Risk: To Price or Not to Price?

    Directory of Open Access Journals (Sweden)

    Tak Kuen Siu

    2011-01-01

    “normative” issues to be addressed in pricing contingent claims under a Markovian, regime-switching, Black-Scholes-Merton model. We address this issue using a minimal relative entropy approach. Firstly, we apply a martingale representation for a double martingale to characterize the canonical space of equivalent martingale measures which may be viewed as the largest space of equivalent martingale measures to incorporate both the diffusion risk and the regime-switching risk. Then we show that an optimal equivalent martingale measure over the canonical space selected by minimizing the relative entropy between an equivalent martingale measure and the real-world probability measure does not price the regime-switching risk. The optimal measure also justifies the use of the Esscher transform for option valuation in the regime-switching market.

  15. Regime shifts and resilience in China's coastal ecosystems.

    Science.gov (United States)

    Zhang, Ke

    2016-02-01

    Regime shift often results in large, abrupt, and persistent changes in the provision of ecosystem services and can therefore have significant impacts on human wellbeing. Understanding regime shifts has profound implications for ecosystem recovery and management. China's coastal ecosystems have experienced substantial deterioration within the past decades, at a scale and speed the world has never seen before. Yet, information about this coastal ecosystem change from a dynamics perspective is quite limited. In this review, I synthesize existing information on coastal ecosystem regime shifts in China and discuss their interactions and cascading effects. The accumulation of regime shifts in China's coastal ecosystems suggests that the desired system resilience has been profoundly eroded, increasing the potential of abrupt shifts to undesirable states at a larger scale, especially given multiple escalating pressures. Policy and management strategies need to incorporate resilience approaches in order to cope with future challenges and avoid major losses in China's coastal ecosystem services.

  16. Water-chemical regime of a fast reactor ower complex

    International Nuclear Information System (INIS)

    Musikhin, R.N.; Piskunov, E.M.; Samarkin, A.A.; Yurchenko, D.S.

    1983-01-01

    Some peculiarities of water-chemical regime of a power compleX in Shevchenko are considered. The complex comprises a desalination unit, a gas-masout heating-and-power plant and the BN-350 reactor. The compleX is used for the production of electric and thermal energy and fresh water. The power complex peculiarity is the utilization of disalinated seawater in a technological cycle along with highly mineralized seawater with a total salt content of 13.5 g/l (for cooling) in heat exchanges. A regime of ammoniacal correction of feed water was used as a basic water-chemical regime in the initial period of the BN-350 steam generator operation. Deposits composed mainly of iron oxide slime were observed on steam generator surfaces during the operation under these conditions. A conclusion is made that the regime with chelating agent providing steam generator safe operation without chemical cleaning is the most expedient one

  17. REGIME SWITCHING DETERMINANTS OF SOVEREIGN CDS SPREADS: EVIDENCE FROM TURKEY

    Directory of Open Access Journals (Sweden)

    Umurcan Polat

    2017-12-01

    Full Text Available In this study, it is assessed the main determinants of sovereign CDS spreads in Turkey from January 2006 to December 2015. Before delving into the nonlinear Markov regime-switching model estimation, a conventional one-state linear model is estimated answering to what extent the sovereign credit risk is affected in between global and country-specific market variables and by credit ratings announcement changes. In broad strokes, the regime-switching analysis reveals that among domestic variables, it is the foreign exchange rate that affects the sovereign credit risk more in more volatile periods and among global variables, the indicators standing for global volatility risk premiums and international liquidity primarily influence the changes in the sovereign CDS spread in turbulent regimes whereas proxies for global risk free rate are significant more in tranquil regimes.

  18. Et dansk regime for overgang fra uddannelse til arbejde?

    DEFF Research Database (Denmark)

    Jørgensen, Christian Helms

    2008-01-01

    I dette kapitel vil jeg først gennemgå en række forskningstilgange som på forskellig måde kan begribe de særlige træk ved unges overgang i Danmark i det man kan kalde et dansk 'regime for overgang' (transition regime). Dernæst følger en mere beskrivende gennemgang af det danske uddannelsessystem ...

  19. Regulatory Regime and its influence in the nuclear safety

    International Nuclear Information System (INIS)

    Laaksonen, J.

    1999-01-01

    A leading internationally agreed principle is that the prime responsibility for nuclear safety rests with each user of nuclear energy. A proper regulatory regime is needed to ensure that this responsibility is met. In the first place it provides a verification that all relevant safety issues are understood and taken into account in the practical measures by the users but it is equally important that the regulatory regime supports the users in their strive to achieve an adequate level of safety (author)

  20. Accountability Challenges in the Transnational Regime Complex for Climate Change

    OpenAIRE

    Widerberg, O.E.; Pattberg, P.H.

    2017-01-01

    This article discusses challenges to accountability in the context of transnational climate governance. It argues that the emergence of a distinct transnational regime complex and the increasingly integrated structure of international and transnational climate governance create new challenges for using established analytical frameworks that rely on accountability regimes for individual actor types. Instead, studying accountability requires a system-level conceptualization and a revisiting of ...

  1. Experimental study on the unstable direct contact condensation regimes

    International Nuclear Information System (INIS)

    Damasio, C.; Del Tin, G.; Fiegna, G.; Malandrone, M.

    1985-01-01

    Vapour-liquid interface fluctuation frequencies have been measured by means of electrical resistive probes. Frequency data from these probes have been compared with measured frequencies from a Kistler piezoelectric pressure transducer in the pool near the steam-water interaction region. An attempt has been made to correlate measured frequencies to the observed condensation regimes. Experimental data concerning ''steam chugging'' and condensation oscillation regimes have been correlated in terms of dimensionless parameters

  2. PARTICULARITIES OF PARLIAMENTARY OVERSIGHT IN DIFFERENT POLITICAL REGIMES

    Directory of Open Access Journals (Sweden)

    Silvia-Claudia CĂLIN-MIHALCEA

    2015-07-01

    Full Text Available The quality and intensity of the parliamentary oversight performed over the Government are shaped by several major criteria: political regime, electoral system, structure of the Parliament (unicameral/bicameral, parliamentary culture and tradition. This paper emphasizes some distinctive elements and particular mechanisms of the control exercised over the activities of the executive power, from the point of view of the political regime established in states with modern democracies.

  3. Ignition Regime for Fusion in a Degenerate Plasma

    International Nuclear Information System (INIS)

    Son, S.; Fisch, N.J.

    2005-01-01

    We identify relevant parameter regimes in which aneutronic fuels can undergo fusion ignition in hot-ion degenerate plasma. Because of relativistic effects and partial degeneracy, the self-sustained burning regime is considerably larger than previously calculated. Inverse bremsstrahlung plays a major role in containing the reactor energy. We solve the radiation transfer equation and obtain the contribution to the heat conductivity from inverse bremsstrahlung

  4. How Do Countries Choose their Exchange Rate Regime?

    OpenAIRE

    Helene Poirson Ward

    2001-01-01

    This paper investigates the determinants of exchange rate regime choice in 93 countries during 1990-98. Cross-country analysis of variations in international reserves and nominal exchange rates shows that (i) truly fixed pegs and independent floats differ significantly from other regimes and (ii) significant discrepancies exist between de jure and de facto flexibility. Regression results highlight the influence of political factors (political instability and government temptation to inflate),...

  5. Regimes of the magnetized Rayleigh endash Taylor instability

    International Nuclear Information System (INIS)

    Winske, D.

    1996-01-01

    Hybrid simulations with kinetic ions and massless fluid electrons are used to investigate the linear and nonlinear behavior of the magnetized Rayleigh endash Taylor instability in slab geometry with the plasma subject to a constant gravity. Three regimes are found, which are determined by the magnitude of the complex frequency ω=ω r +iγ. For |ω| i (Ω i = ion gyrofrequency), one finds the typical behavior of the usual fluid regime, namely the development of open-quote open-quote mushroom-head close-quote close-quote spikes and bubbles in the density and a strongly convoluted boundary between the plasma and magnetic field, where the initial gradient is not relaxed much. A second regime, where |ω|∼0.1Ω i , is characterized by the importance of the Hall term. Linearly, the developing flute modes are more finger-like and tilted along the interface; nonlinearly, clump-like structures form, leading to a significant broadening of the interface. The third regime is characterized by unmagnetized ion behavior, with |ω|∼Ω i . Density clumps, rather than flutes, form in the linear stage, while nonlinearly, longer-wavelength modes that resemble those in fluid regime dominate. Finite Larmor radius stabilization of short-wavelength modes is observed in each regime. copyright 1996 American Institute of Physics

  6. Development of Risk Assessment Methodology for State's Nuclear Security Regime

    International Nuclear Information System (INIS)

    Jang, Sung Soon; Seo, Hyung Min; Lee, Jung Ho; Kwak, Sung Woo

    2011-01-01

    Threats of nuclear terrorism are increasing after 9/11 terrorist attack. Treats include nuclear explosive device (NED) made by terrorist groups, radiological damage caused by a sabotage aiming nuclear facilities, and radiological dispersion device (RDD), which is also called 'dirty bomb'. In 9/11, Al Qaeda planed to cause radiological consequences by the crash of a nuclear power plant and the captured airplane. The evidence of a dirty bomb experiment was found in Afganistan by the UK intelligence agency. Thus, the international communities including the IAEA work substantial efforts. The leaders of 47 nations attended the 2010 nuclear security summit hosted by President Obama, while the next global nuclear summit will be held in Seoul, 2012. Most states established and are maintaining state's nuclear security regime because of the increasing threat and the international obligations. However, each state's nuclear security regime is different and depends on the state's environment. The methodology for the assessment of state's nuclear security regime is necessary to design and implement an efficient nuclear security regime, and to figure out weak points. The IAEA's INPRO project suggests a checklist method for State's nuclear security regime. The IAEA is now researching more quantitative methods cooperatively with several countries including Korea. In this abstract, methodologies to evaluate state's nuclear security regime by risk assessment are addressed

  7. International regime formation: Ozone depletion and global climate change

    International Nuclear Information System (INIS)

    Busmann, N.E.

    1994-03-01

    Two theoretical perspectives, neorealism and neoliberal institutionalism, dominate in international relations. An assessment is made of whether these perspectives provide compelling explanations of why a regime with specific targets and timetables was formed for ozone depletion, while a regime with such specificity was not formed for global climate change. In so doing, the assumptions underlying neorealism and neoliberal institutionalism are examined. A preliminary assessment is offered of the policymaking and institutional bargaining process. Patterns of interstate behavior are evolving toward broader forms of cooperation, at least with regard to global environmental issues, although this process is both slow and cautious. State coalitions on specific issues are not yet powerful enough to create a strong community of states in which states are willing to devolve power to international institutions. It is shown that regime analysis is a useful analytic framework, but it should not be mistaken for theory. Regime analysis provides an organizational framework offering a set of questions regarding the principles and norms that govern cooperation and conflict in an issue area, and whether forces independent of states exist which affect the scope of state behavior. An examination of both neorealism and neoliberal institutionalism, embodied by four approaches to regime formation, demonstrates that neither has sufficient scope to account for contextual dynamics in either the ozone depletion or global climate change regime formation processes. 261 refs

  8. Numerical simulation of transitions between back discharge regimes

    International Nuclear Information System (INIS)

    Jansky, Jaroslav; Lemont, Florent; Bessieres, Delphine; Paillol, Jean

    2014-01-01

    This paper presents numerical simulations of transitions between back discharge regimes. Back discharge refers to any discharge initiated at or near a dielectric layer covering a passive electrode. In this work, a pinhole in a dielectric layer on a plane anode serves as a model for back discharge activity. We have studied transitions between back discharge regimes by varying the surface charge density on the dielectric layer and the electric field in front of the pinhole. From the variation of these two independent parameters, the back discharge regimes have been depicted as a mode diagram inspired by the experimental study of Masuda and Mizuno. The resulting diagram includes the different discharge regimes that are commonly observed in experiments. The propagation of a positive ionizing wave inside the pinhole toward its edge, and the resulting formation of a plasma zone at its exit constitute the onset stage of back discharge. From this stage, the transitions to volume discharge or surface discharge can occur. The volume discharge regime consists of the propagation of a discharge in space toward the cathode which can be superimposed with the propagation of a discharge above the dielectric layer surface. The diagram reveals the conditions for transitions between back discharge regimes. (authors)

  9. Do family policy regimes matter for children's well-being?

    Science.gov (United States)

    Engster, Daniel; Stensöta, Helena Olofsdotter

    2011-01-01

    Researchers have studied the impact of different welfare state regimes, and particularly family policy regimes, on gender equality. Very little research has been conducted, however, on the association between different family policy regimes and children's well-being. This article explores how the different family policy regimes of twenty OECD countries relate to children's well-being in the areas of child poverty, child mortality, and educational attainment and achievement. We focus specifically on three family policies: family cash and tax benefits, paid parenting leaves, and public child care support. Using panel data for the years 1995, 2000, and 2005, we test the association between these policies and child well-being while holding constant for a number of structural and policy variables. Our analysis shows that the dual-earner regimes, combining high levels of support for paid parenting leaves and public child care, are strongly associated with low levels of child poverty and child mortality. We find little long-term effect of family policies on educational achievement, but a significant positive correlation between high family policy support and higher educational attainment. We conclude that family policies have a significant impact on improving children's well-being, and that dual-earner regimes represent the best practice for promoting children's health and development.

  10. A critical review of the Chilean civil nuclear liability regime

    International Nuclear Information System (INIS)

    Gonzalez Cruz, Francisco Javier; Acevedo Ferrer, Santiago

    2013-01-01

    This article reviews the Chilean civil nuclear liability regime. The Nuclear Security Act (Law 18.302), enacted in 1984, and the Vienna Convention on Civil Liability for Nuclear Damage, ratified ed by Chile in 1989, are the fundamental laws of the current regime. Although Chile has no nuclear power plants, it is still important to analyze how the Chilean legislation would protect citizens from nuclear damages. This paper does not consider the policy reasons for and against the promotion of atomic energy. Rather, it critically examines the current status of the Chilean nuclear regime. Undoubtedly, if in the future Chile chooses to include nuclear sources in its energy mix, it will not be enough to introduce some isolated legal amendments, but it will be necessary to build a new Chilean Energy Regime which includes nuclear energy. In that scenario, though, it will be useful to know and understand how the current nuclear liability regime works. From this point of view, the reforms this article proposes to the current nuclear liability regime might be helpful to academics and policy makers alike

  11. Triggered dynamics in a model of different fault creep regimes.

    Science.gov (United States)

    Kostić, Srđan; Franović, Igor; Perc, Matjaž; Vasović, Nebojša; Todorović, Kristina

    2014-06-23

    The study is focused on the effect of transient external force induced by a passing seismic wave on fault motion in different creep regimes. Displacement along the fault is represented by the movement of a spring-block model, whereby the uniform and oscillatory motion correspond to the fault dynamics in post-seismic and inter-seismic creep regime, respectively. The effect of the external force is introduced as a change of block acceleration in the form of a sine wave scaled by an exponential pulse. Model dynamics is examined for variable parameters of the induced acceleration changes in reference to periodic oscillations of the unperturbed system above the supercritical Hopf bifurcation curve. The analysis indicates the occurrence of weak irregular oscillations if external force acts in the post-seismic creep regime. When fault motion is exposed to external force in the inter-seismic creep regime, one finds the transition to quasiperiodic- or chaos-like motion, which we attribute to the precursory creep regime and seismic motion, respectively. If the triggered acceleration changes are of longer duration, a reverse transition from inter-seismic to post-seismic creep regime is detected on a larger time scale.

  12. Muestreo adaptativo aplicado a la robótica: Revisión del estado de la técnica

    Directory of Open Access Journals (Sweden)

    Ignacio Pastor

    2017-04-01

    Full Text Available Resumen: En este artículo se presenta la revisión de una técnica de muestreo de especial interés para aplicaciones a sistemas roboticos dedicados a la teledetección. Esta técnica es conocida como muestreo adaptativo. En este artículo se realiza una recopilación de las principales técnicas de muestreo adaptativo aplicados a la robótica, haciendo uso de la planificación de trayectorias. Finalmente, se destaca un conjunto de proyectos actualmente en desarrollo, sobre aplicaciones reales de la técnica de muestreo adaptativo en la robótica. Abstract: In this paper, a robotics sampling methodology known as Adaptive Sampling (AS is reviewed. Although the method is not yet widespread in robotics, it plays an important role in remote sensing applications over rapidly changing environments. This article gives an introduction to AS and summarizes the main AS techniques and algorithms applied to robotics. Finally, a number of projects currently under development using AS to solve relevant monitoring or sampling issues, are highlighted. Palabras clave: Robots de exteriores, Muestreo adaptativo, Teledetección, Planificación de trayectorias, Cobertura Óptima, Keywords: Field robotics, Adaptive sampling, Remote sensing, Path planning, Optimal coverage

  13. Desenvolvimento de um sistema de rastreabilidade aplicado à cadeia de produção do vinho Development of a traceability system applied to the wine production chain

    Directory of Open Access Journals (Sweden)

    Luís Fernando de Abreu Porto

    2007-10-01

    Full Text Available Com o presente trabalho visou-se desenvolver um sistema de rastreabilidade aplicado à cadeia de produção do vinho. Foram utilizados a tecnologia de desenvolvimento JSP (Java Server Pages; o banco de dados MySQL; bem como o Tomcat, para servidor de JSP. O sistema para rastreabilidade do vinho desenvolvido é útil tanto para os produtores quanto para os consumidores por ser um indicador de segurança alimentar, visto que com ele é possível se rastrear a história da garrafa de um vinho desde o plantio da uva até o momento de seu consumo.The present work aimed to develop a traceability system applied to the wine production chain. The JSP development technology (Java Server Pages, the MySQL data base, as well as the Tomcat for JSP server, have been used. The developed system for wine traceability is useful for the producers as well as for the consumers for being an indicator of food safety, since with it, it is possible to track the history of the bottle of a wine from the plantation of the grape to the moment of its consumption.

  14. O conceito de autonomia aplicado ao processo de aquisição de línguas estrangeiras na era da informação

    Directory of Open Access Journals (Sweden)

    Erica de Cássia Modesto Coutrim

    2016-10-01

    Full Text Available O uso de ferramentas da Internet para fins educacionais tem sido comumente associado, no ambiente escolar, à noção de autonomia. Esse conceito, no entanto, envolve elementos que extrapolam questões metodológicas de aquisição de línguas estrangeiras – engloba também questões sociais, políticas e gnosiológicas. Por isso, procuraremos explorar o conceito de autonomia aplicado ao ensino e aprendizagem de LE por meio da Internet, partindo do princípio de que o indivíduo autônomo não pode ser determinado por outros indivíduos, e nem mesmo por aparatos tecnológicos, por mais avançados que sejam. Examinaremos, por meio de observação e questionários, porém, em que medida o uso de ferramentas de tecnologia comunicacional no ambiente Web pode contribuir para o processo de formação de um indivíduo autônomo e, portanto, ativo, em seu próprio processo de aquisição de uma língua estrangeira.

  15. VIABILIDADE ECONÔMICA DE PROJETOS E ASPECTOS PARTICULARES EM EMPREENDIMENTOS TIPO PROJECT FINANCE APLICADOS A INVESTIMENTOS MEDIANTE PARCERIA PÚBLICO-PRIVADA EM INFRAESTRUTURA DE TRANSPORTES

    Directory of Open Access Journals (Sweden)

    Alexandre da Costa Pereira

    2013-01-01

    Full Text Available O artigo tem por objetivo destacar aspectos relacionados com a análise da viabilidade de projetos de infraestrutura de transportes, aplicados a estudos de ampliação de capacidade de sistemas de transporte, sendo destacado no trabalho o aspecto da relevante importância da participação da iniciativa privada como parceira nos investimentos em infraestrutura. São abordados os métodos e estudos de viabilidade técnica e econômica, empréstimos, financiamentos e aspectos particulares a estudos para avaliação de projetos na área de infraestrutura de transportes. Como método para a avaliação de viabilidade financeira de projetos de concessões em investimentos em infraestrutura foi escolhido o Project Finance, tanto por seu potencial para a obtenção de parâmetros fundamentais para a tomada de decisão sobre alternativas de investimento, notadamente em projetos que considerem a participação privada como importante na viabilização do projeto, como para a análise de fatores intervenientes no risco de um investimento em obras de infraestrutura de transportes.

  16. Relación microestructura resistencia al desgaste de recubrimientos duros ricos en cromo y tungsteno aplicados por soldadura electrica (SMAW

    Directory of Open Access Journals (Sweden)

    Lisys Margarita León Sevilla

    2004-01-01

    Full Text Available Se comparó la microestructura y resistencia a la abrasión de recubrimientos duros depositados por soldadura sobre placas de acero estructural ASTM A36. Se utilizaron cinco electrodos comerciales, dos de bajo cromo, dos de alto cromo aplicados en una y dos capas y uno rico en tungsteno depositado en una capa La resistencia al desgaste fue evaluada en una máquina de rueda de caucho y arena seca construida según la norma ASTM G65-80. Como material abrasivo se utilizaron partículas de sílice con índice de finura AFS 50- 70. La caracterización de las microestructuras se realizó utilizando microscopía óptica y electrónica de barrido. Los resultados mostraron que el parámetro de resistencia a la abrasión no está directamente relacionado con dureza del material pero sí con el tipo, tamaño, forma, composición química y distribución de los carburos presentes en la matriz del recubrimiento. La mejor resistencia a la abrasión se obtuvo en depósitos con microestructura compuesta por carburos primarios (del tipo M7C3 en recubrimientos ricos en Cr o del tipo MC, M6C en recubrimientos ricos en W en una matriz eutéctica.

  17. COMPORTAMIENTO FISIOLÓGICO POSTCOSECHA DE TALLOS FLORALES DE ROSA (Rosa hybrida L. EN RESPUESTA AL FÓSFORO APLICADO EN PRECOSECHA

    Directory of Open Access Journals (Sweden)

    Colinas-León MT

    2011-01-01

    Full Text Available Durante el crecimiento y desarro- llo de las flores, la nutrición fosforada es un factor que puede influir en la vida en flore- ro. El objetivo de este trabajo fue evaluar el efecto de cinco niveles de fósforo (P: 0, 0.5, 1.0, 1.5 y 2.0 me·L-1 de P aplicados en precosecha, mediante un sistema hidropóni- co abierto, en el comportamiento fisiológico postcosecha de tallos florales de rosa (Rosa hybrida L. ‘Classy’ y ‘Vega’. Las variables evaluadas durante la vida de florero de los tallos florales fueron: transpiración foliar y floral, potencial de turgencia foliar y de pétalos. Además, se evaluó la concentración de antocianinas en pétalos al momento de la cosecha. Las aplicaciones de P en precose- cha tuvieron efecto significativo únicamente en la transpiración foliar; sin embargo, se demostró que la mayor vida en florero (15.8 días de ‘Classy’ en comparación con ‘Vega’ (11.7 días estuvo directamente asociada con mayores potenciales de turgencia foliar y de pétalos, mayor tasa transpiratoria floral y menor tasa transpiratoria foliar en ‘Classy’.

  18. Viabilidad de un programa de prevención selectiva de los problemas de ansiedad en la infancia aplicado en la escuela

    Directory of Open Access Journals (Sweden)

    Miquel Tortella Feliu

    2004-01-01

    Full Text Available Los programas de prevención de los trastornos psicopatológicos en la infancia y la adolescencia son todavía muy escasos. El objetivo del presente estudio fue el de analizar mediante un experimento complejo (diseño 2x3 de un factor entre grupo con dos niveles y un factor intra –tiempo- con tres niveles, la viabilidad de un programa breve de prevención selectiva de los problemas de ansiedad aplicado en la escuela en una muestra de niños y niñas de Educación Secundaria Obligatoria. Trece niños/-as con elevada sensibilidad a la ansiedad recibieron un programa para la prevención de la ansiedad. La sensibilidad a la ansiedad en la infancia y adolescencia se considera como uno de los principales factores de riesgo para el desarrollo de trastornos de ansiedad. Un grupo de sujetos procedentes de la misma muestra y con puntuaciones normales en todas las variables estudiadas sirvió de grupo control. Al final de la intervención, el grupo al que se aplicó el programa preventivo mostró reducciones estadísticamente significativas respecto al grupo control en dos de las tres variables de resultado analizadas: sensibilidad a la ansiedad, ansiedad rasgo pero no en sintomatología depresiva. Los resultados se mantenían en el seguimiento a tres meses.

  19. Evaluación del nuevo modelo de atención en salud aplicado a una población de la Policía Nacional.

    Directory of Open Access Journals (Sweden)

    Jaime Mauricio Achury Sabogal

    2016-12-01

    Full Text Available La investigación se fundamenta en la construcción de un nuevo modelo de salud bajo las estrategias de la Atención primaria en salud (APS, el cual fue aplicado en el año 2004 a una población de 199 enfermos crónicos usuarios del sistema de salud de la Policía Nacional de Colombia, a los que se les practica una encuesta y valoración clínica, antes y después de la intervención. Resultado: vincular a la persona en el centro de la atención, la conformación de equipos transdisciplinarios que promueven la asistencia integral, integrada y continua con un contacto resolutivo, llevan a una mejora sustancial en los resultados que se traduce en mejor calidad de vida. Conclusión: modelo APS mejora condiciones de salud en población objeto de estudio.

  20. Evaluation of Five Different Regimes For the Treatment of Vitiligo

    Directory of Open Access Journals (Sweden)

    J S Pasricha

    1989-01-01

    Full Text Available Response of vitiligo patients to five different regimes was evaluated taking only those patients who had either static or progressively increasing lesions. Selection of the regimen depended upon the clinical characteristics of the disease. Each regime was tried for at least 4 months and if a patient didnot improve with one regime, he was shifted to another regime. A patient was considered to have improved, if the lesions started regimenting or the previously progressive lesions stopped increasing further. Regime I consisted of 150 mg levamisol orally on two consecutive days per week, given to 13 cases, it resulted in improvement in 7 (53.80/o. Regime II consisted of levamisole in the same dose combined with once a day topical massage with 0.1% fluocinolone acetonide acetate cream; it led to improvement in 27 (81.8% of the 33 cases. Regime III consisted of 3 mg betamethasone orally on alternate days combined with levamisole and topical fluocinolone; given to 32 cases, it was successful in 28 (87.50/o. A combination of 2 mg betamethasone orally alternating with 20 mg 8-methoxypsoralen and sun exposure (regime IV caused improvement in 17 (85% of the 20 cases. An oral mini pulse consisting of 5 mg betamethasone orally twice a week combined with 50 mg cyclophosphimide daily orally (regime V was successful in 20 (90.9% of the 22 cases, the remaining two cases showed unprovement when the dose ofbetamethasonc .was increased from 5 mg to 7.5 mg twice a week. Thus ultimately each one of the 91 patients responded to one or the other regime. The side effects were minimal and insignificant.The degree of improvement at the time of analysis was 100% in 23.3% cases, 50-100% in 44.2′Yo cases and less than 50% in 32.5%, after 4-14 months of treatment. It is felt that the results may be better after a longer follow-up although all patients are not expected to get complete repigmentation.

  1. Modeling Whistler Wave Generation Regimes In Magnetospheric Cyclotron Maser

    Science.gov (United States)

    Pasmanik, D. L.; Demekhov, A. G.; Trakhtengerts, V. Y.; Parrot, M.

    Numerical analysis of the model for cyclotron instability development in the Earth magnetosphere is made.This model, based on the self-consistent set of equations of quasi-linear plasma theory, describes different regimes of wave generation and related energetic particle precipitation. As the source of free energy the injection of energetic electrons with transverse anisotropic distribution function to the interaction region is considered. Two different mechanisms of energetic electron loss from the interaction region are discussed. The first one is precipitation of energetic particles via the loss cone. The other mechanism is drift of particles away from the interaction region across the mag- netic field line. In the case of interaction in plasmasphere or rather large areas of cold plasma density enhancement the loss cone precipitation are dominant. For interaction in a subauroral duct losses due to drift are most effective. A parametric study of the model for both mechanisms of particle losses is made. The main attention is paid to the analysis of generation regimes for different characteristics of energetic electron source, such as the shape of pitch-angle distributions and elec- tron density. We show that in addition to the well-known stationary generation and periodic regime with successive spikes of similar shape, more complex forms of wave spectrum exist. In particular, we found a periodic regime, in which a single period in- cludes two separate spikes with different spectral shapes. In another regime, periodic generation of spikes at higher frequencies together with quasi-stationary generation at lower frequencies occurs. Quasi-periodic regime with spike overlapping, i.e. when generation of a new spike begins before the previous one is over is also found. Results obtained are compared with experimental data on quasi-periodic regimes of whistler wave generation.

  2. Weather regimes in past climate atmospheric general circulation model simulations

    Energy Technology Data Exchange (ETDEWEB)

    Kageyama, M.; Ramstein, G. [CEA Saclay, Gif-sur-Yvette (France). Lab. des Sci. du Climat et de l' Environnement; D' Andrea, F.; Vautard, R. [Laboratoire de Meteorologie Dynamique, Ecole Normale Superieure, Paris (France); Valdes, P.J. [Department of Meteorology, University of Reading (United Kingdom)

    1999-10-01

    We investigate the climates of the present-day, inception of the last glaciation (115000 y ago) and last glacial maximum (21000 y ago) in the extratropical north Atlantic and Europe, as simulated by the laboratoire de Meteorologie dynamique atmospheric general circulation model. We use these simulations to investigate the low-frequency variability of the model in different climates. The aim is to evaluate whether changes in the intraseasonal variability, which we characterize using weather regimes, can help describe the impact of different boundary conditions on climate and give a better understanding of climate change processes. Weather regimes are defined as the most recurrent patterns in the 500 hPa geopotential height, using a clustering algorithm method. The regimes found in the climate simulations of the present-day and inception of the last glaciation are similar in their number and their structure. It is the regimes' populations which are found to be different for these climates, with an increase of the model's blocked regime and a decrease in the zonal regime at the inception of the last glaciation. This description reinforces the conclusions from a study of the differences between the climatological averages of the different runs and confirms the northeastward shift to the tail of the Atlantic storm-track, which would favour more precipitation over the site of growth of the Fennoscandian ice-sheet. On the other hand, the last glacial maximum results over this sector are not found to be classifiable, showing that the change in boundary conditions can be responsible for severe changes in the weather regime and low-frequency dynamics. The LGM Atlantic low-frequency variability appears to be dominated by a large-scale retrogressing wave with a period 40 to 50 days. (orig.)

  3. Regime switching model for financial data: Empirical risk analysis

    Science.gov (United States)

    Salhi, Khaled; Deaconu, Madalina; Lejay, Antoine; Champagnat, Nicolas; Navet, Nicolas

    2016-11-01

    This paper constructs a regime switching model for the univariate Value-at-Risk estimation. Extreme value theory (EVT) and hidden Markov models (HMM) are combined to estimate a hybrid model that takes volatility clustering into account. In the first stage, HMM is used to classify data in crisis and steady periods, while in the second stage, EVT is applied to the previously classified data to rub out the delay between regime switching and their detection. This new model is applied to prices of numerous stocks exchanged on NYSE Euronext Paris over the period 2001-2011. We focus on daily returns for which calibration has to be done on a small dataset. The relative performance of the regime switching model is benchmarked against other well-known modeling techniques, such as stable, power laws and GARCH models. The empirical results show that the regime switching model increases predictive performance of financial forecasting according to the number of violations and tail-loss tests. This suggests that the regime switching model is a robust forecasting variant of power laws model while remaining practical to implement the VaR measurement.

  4. TYPES OF POLITICAL REGIMES IN THE IRKUTSK REGION

    Directory of Open Access Journals (Sweden)

    И В Орлова

    2017-12-01

    Full Text Available The authors consider contemporary western and Russian classifications of regional political regimes and their applicability for Russia. Based on the analysis of political theories, the authors chose the traditional typology of regional political regimes focusing on the minimalist interpretation of democracy (electoral competition and methods for identifying regional scenarios introduced by V.Ya. Gelman. The authors study the case of the Irkutsk Region as a region with conflicting elites, in which in a short period several regional heads were replaced. Based on the contemporary political history, the authors analyze the regional political regime using the following criteria: democracy/autocracy, consolidation/oligo-poly, compromise/conflict relations within the ruling elite. The results of the analysis prove the existence of checks and balances in the political system of the Irkutsk Region. Such a system restrains strong politicians attempts to monopolize the political power in the region. When any political player gains too much influence, other centers of power unite against him and together return the situation to the status quo. The political regime of the Irkutsk Region ensures a relatively high level of political competition, at the same time it is a part of the uncompetitive political regime of the Russian Federation, therefore it is a ‘hybrid democracy’. The authors’ analysis of intra-elite relations in the region revealed a high predisposition to conflicts with the dominant scenario of ‘war of all against all’.

  5. Regimes of operation in the Princeton Large Torus

    Energy Technology Data Exchange (ETDEWEB)

    Hosea, J.C.

    1979-10-01

    In the quest for optimum discharge conditions in the Princeton Large Torus (PLT), a variety of discharge regimes have been produced. These separate broadly into two main categories - those regimes with m greater than or equal to 2 oscillatory MHD instabilities and often hollow electron profiles for tungsten limiters, and those regimes for which the electron temperature is sufficiently peaked to support the internal sawtooth or near-sawtooth (m = 1) instability. The internal sawtooth regime is found to be optimum for confinement but to be more difficult to select when low-Z impurity concentrations have been reduced with low power discharge cleaning or gettering to permit extension of the high density operation limit. Gas programming is used to cool the plasma periphery, thereby reducing the high-Z impurity concentrations and causing the current channel to constrict into the sawtooth regime, and then to attain the desired plasma density. With discharges selected in this manner, gross energetic confinement times up to approx. 100 msec have been obtained at densities of approx. 10/sup 14/ cm/sup -3/, and very high ion and electron temperatures have been produced with neutral beam injection heating at lower densities with no observable deleterious effect on energy confinement.

  6. The political use of psychiatry: A comparison between totalitarian regimes.

    Science.gov (United States)

    Buoli, Massimiliano; Giannuli, Aldo Sabino

    2017-03-01

    After the end of Second World War, the recent experience of the Nazi horrors stimulated a debate about the political use of psychiatry. Over the years, the focus shifted on major dictatorships of the time and especially on Soviet Union. This article aims to provide a critical review of the ways in which psychiatry was used by totalitarian regimes of the 20th century. We summarized relevant literature about political use of psychiatry in totalitarian regimes of the 20th century, with particular focus on Fascism, Nazism, Argentina dictatorship, Soviet Union and China. One of the features that are common to most of the dictatorships is that the use of psychiatry has become more prominent when the regimes have had the need to make more acceptable the imprisonment of enemies in the eyes of the world. This for example happened in the Nazi regime when sterilization and killing of psychiatric patients was explained as a kind of euthanasia, or in the Soviet Union after the formal closure of the corrective labor camps and the slow resumption of relations with the capitalistic world, or in China to justify persecution of religious minorities and preserve economic relations with Western countries. Psychiatry has been variously used by totalitarian regimes as a means of political persecution and especially when it was necessary to make acceptable to public opinion the imprisonment of political opponents.

  7. Evaluation and Comparison of Extremal Hypothesis-Based Regime Methods

    Directory of Open Access Journals (Sweden)

    Ishwar Joshi

    2018-03-01

    Full Text Available Regime channels are important for stable canal design and to determine river response to environmental changes, e.g., due to the construction of a dam, land use change, and climate shifts. A plethora of methods is available describing the hydraulic geometry of alluvial rivers in the regime. However, comparison of these methods using the same set of data seems lacking. In this study, we evaluate and compare four different extremal hypothesis-based regime methods, namely minimization of Froude number (MFN, maximum entropy and minimum energy dissipation rate (ME and MEDR, maximum flow efficiency (MFE, and Millar’s method, by dividing regime channel data into sand and gravel beds. The results show that for sand bed channels MFN gives a very high accuracy of prediction for regime channel width and depth. For gravel bed channels we find that MFN and ‘ME and MEDR’ give a very high accuracy of prediction for width and depth. Therefore the notion that extremal hypotheses which do not contain bank stability criteria are inappropriate for use is shown false as both MFN and ‘ME and MEDR’ lack bank stability criteria. Also, we find that bank vegetation has significant influence in the prediction of hydraulic geometry by MFN and ‘ME and MEDR’.

  8. THE IMPACT OF THE GLOBAL NUCLEAR SAFETY REGIME IN BRAZIL

    International Nuclear Information System (INIS)

    Almeida, C.

    2004-01-01

    A turning point of the world nuclear industry with respect to safety occurred due to the accident at Chernobyl, in 1986. A side from the tragic personal losses and the enormous financial damage, the Chernobyl accident has literally demonstrated that ''a nuclear accident anywhere is an accident everywhere''. The impact was felt immediately by the nuclear industry, with plant cancellations (e.g. Austria), elimination of national programs (e.g. Italy) and general construction delays. However, the reaction of the nuclear industry was equally immediate, which led to the proposal and establishment of a Global Nuclear Safety Regime. This regime is composed of biding international safety conventions, globally accepted safety standard, and a voluntary peer review system. In a previous work, the author has presented in detail the components of this Regime, and briefly discussed its impact in the Brazilian nuclear power organizations, including the Regulatory Body. This work, on the opposite, briefly reviews the Global Nuclear Safety Regime, and concentrates in detail in the discussion of its impact in Brazil, showing how it has produced some changes, and where the peer pressure regime has failed to produce real results

  9. Vegetation management with fire modifies peatland soil thermal regime.

    Science.gov (United States)

    Brown, Lee E; Palmer, Sheila M; Johnston, Kerrylyn; Holden, Joseph

    2015-05-01

    Vegetation removal with fire can alter the thermal regime of the land surface, leading to significant changes in biogeochemistry (e.g. carbon cycling) and soil hydrology. In the UK, large expanses of carbon-rich upland environments are managed to encourage increased abundance of red grouse (Lagopus lagopus scotica) by rotational burning of shrub vegetation. To date, though, there has not been any consideration of whether prescribed vegetation burning on peatlands modifies the thermal regime of the soil mass in the years after fire. In this study thermal regime was monitored across 12 burned peatland soil plots over an 18-month period, with the aim of (i) quantifying thermal dynamics between burned plots of different ages (from post burning), and (ii) developing statistical models to determine the magnitude of thermal change caused by vegetation management. Compared to plots burned 15 + years previously, plots recently burned (management effects. Temperatures measured in soil plots burned vegetation regrows. Our findings that prescribed peatland vegetation burning alters soil thermal regime should provide an impetus for further research to understand the consequences of thermal regime change for carbon processing and release, and hydrological processes, in these peatlands. Copyright © 2015 The Authors. Published by Elsevier Ltd.. All rights reserved.

  10. Oil Regime Change in Iraq. Possible Strategic Implications for OPEC

    International Nuclear Information System (INIS)

    Boon Von Ochssee, T.A.

    2006-06-01

    The potential strategic impact of regime change in Iraq and Iran on OPEC in the long-run is explored. In the first part of the paper short overviews are given of the present international oil market; of US oil import issues and energy policy; of the strategic position of the US in the Persian Gulf and of geopolitical developments in the Persian Gulf at large. Also, attention is paid to the OPEC and the role of a 'new' Iraq. In the second part the game of 'boxed pigs' is used to explore the possible strategic impact of regime change in Iraq and possible regime change in Iran on OPEC. This exploration takes place within four possible futures for the Gulf

  11. Clustering impact regime with shocks in freely evolving granular gas

    Science.gov (United States)

    Isobe, Masaharu

    2017-06-01

    A freely cooling granular gas without any external force evolves from the initial homogeneous state to the inhomogeneous clustering state, at which the energy decay deviates from the Haff's law. The asymptotic behavior of energy in the inelastic hard sphere model have been predicted by several theories, which are based on the mode coupling theory or extension of inelastic hard rods gas. In this study, we revisited the clustering regime of freely evolving granular gas via large-scale molecular dynamics simulation with up to 16.7 million inelastic hard disks. We found novel regime regarding on collisions between "clusters" spontaneously appearing after clustering regime, which can only be identified more than a few million particles system. The volumetric dilatation pattern of semicircular shape originated from density shock propagation are well characterized on the appearing of "cluster impact" during the aggregation process of clusters.

  12. Intergenerational Justice Perceptions and the Role of Welfare Regimes

    DEFF Research Database (Denmark)

    Sabbagh, Clara; Vanhuysse, Pieter

    2010-01-01

    , different welfare regimes structure young people's perceptions of the justness of public resources transfers from young to elderly age-groups and (2) the perceived relative contributions and rewards of various age-groups. Thus we inquire about both the perceived support in principle and about the perceived...... justness of actual outcomes of resource transfers between age-groups. We find that support of transfers from the young to the old is higher in social-democratic and conservative welfare regimes than in liberal and radical regimes. Support of resource transfers also correlates positively with a 'welfare......-statist' ideological frame (the endorsement of egalitarian redistribution and broad state responsibility for welfare provision and the attribution of social inequality to external causes), and negatively with a 'market-based' frame (individualism, a work ethic, and internal attribution). Regarding actual outcomes...

  13. Determination of the Hall Thruster Operating Regimes; TOPICAL

    International Nuclear Information System (INIS)

    L. Dorf; V. Semenov; Y. Raitses; N.J. Fisch

    2002-01-01

    A quasi one-dimensional (1-D) steady-state model of the Hall thruster is presented. For the same discharge voltage two operating regimes are possible - with and without the anode sheath. For given mass flow rate, magnetic field profile and discharge voltage a unique solution can be constructed, assuming that the thruster operates in one of the regimes. However, we show that for a given temperature profile the applied discharge voltage uniquely determines the operating regime: for discharge voltages greater than a certain value, the sheath disappears. That result is obtained over a wide range of incoming neutral velocities, channel lengths and widths, and cathode plane locations. It is also shown that a good correlation between the quasi 1-D model and experimental results can be achieved by selecting an appropriate electron mobility and temperature profile

  14. Revisiting democratic civil peace: Electoral regimes and civil conflict

    DEFF Research Database (Denmark)

    Bartusevicius, Henrikas; Skaaning, Svend-Erik

    2018-01-01

    to use force. Building on this framework, we distinguish between five regime types according to their electoral features—non-electoral autocracies, single-party autocracies, multi-party autocracies, minimalist democracies, and polyarchies—and specify hypotheses regarding the likelihood of conflict...... in each. In a global statistical analysis spanning 1817‒2006 and employing the new Lexical Index of Electoral Democracy (LIED), we find that polyarchies, characterized by unconstrained contestation, have a lower risk of conflict than any other regime type (although minimalist democracies are only slightly......) elections and minimal electoral competition. Overall, our study underscores the importance of focusing on the central attributes of democracy and sheds new light on the relationship between particular regime features (or types) and conflict, thereby contributing to the growing efforts in conflict research...

  15. Dispersive regime of the Jaynes–Cummings and Rabi lattice

    International Nuclear Information System (INIS)

    Zhu, Guanyu; Koch, Jens; Schmidt, Sebastian

    2013-01-01

    Photon-based strongly correlated lattice models like the Jaynes–Cummings and Rabi lattices differ from their more conventional relatives like the Bose–Hubbard model by the presence of an additional tunable parameter: the frequency detuning between the pseudo-spin degree of freedom and the harmonic mode frequency on each site. Whenever this detuning is large compared to relevant coupling strengths, the system is said to be in the dispersive regime. The physics of this regime is well-understood at the level of a single Jaynes–Cummings or Rabi site. Here, we extend the theoretical description of the dispersive regime to lattices with many sites, for both strong and ultra-strong coupling. We discuss the nature and spatial range of the resulting qubit–qubit and photon–photon coupling, demonstrate the emergence of photon-pairing and squeezing and illustrate our results by exact diagonalization of the Rabi dimer. (paper)

  16. Challenges in Finding AGNs in the Low Luminosity Regime

    Science.gov (United States)

    Satyapal, Shobita; Abel, Nick; Secrest, Nathan; Singh, Amrit; Ellison, Sara

    2016-08-01

    Low luminosity AGNs are an important component of the AGN population. They are often found in the lowest mass galaxies or galaxies that lack classical bulges, a demographic that places important constraints to models of supermassive black hole seed formation and merger-free models of AGN fueling. The detection of AGNs in this low luminosity regime is challenging both because star formation in the host galaxy can dominate the optical spectrum and gas and dust can obscure the central engine at both optical and X-ray wavelengths. Thus while mid-infrared color selection and X-ray observations at energies <10 keV are often powerful tools in uncovering optically unidentified AGNs at higher luminosities, this is not the case in the low luminosity regime. In this talk, I will review the effectiveness of uncovering AGNs in the low luminosity regime using multiwavength investigations, with a focus on infrared spectroscopic signatures.

  17. The political constitution of the EU citizen rights regime

    DEFF Research Database (Denmark)

    Olsen, Tore Vincents

    2011-01-01

    Reactions to decisions by the European Court of Justice (ECJ) demonstrate that the political institutions in the Union should take responsibility for the development of the structure of the European Union's (EU) citizen rights regime. This article analyses different political views on the EU...... communities and institutions to the good life of citizens, both individually and collectively. Taking the contestation between the different views seriously, the article argues in favour of political constitutionalism, according to which the development of the EU citizen rights regime is the responsibility...... citizen rights regime. It argues that the disagreement between them is largely a disagreement between ‘reasonable views’. The disagreement is mainly based on different views about the levels (European, national) at which individuals are to be seen as equals and about the contribution of different...

  18. Second regime tokamak operation at large aspect ratio

    International Nuclear Information System (INIS)

    Navratil, G.A.

    1989-01-01

    This paper reviews the need for high beta in economic tokamak reactors and summarizes recent results on the scaling of the second regime beta limit for high-n ballooning modes using optimized pressure profiles as well as results on low-n mode stability at the first regime beta limit from the Columbia HBT tokamak. While several experiments have studied ballooning limits using high εβ p plasmas, the most important question for the use of the second stability regime for tokamak reactor improvement is how to achieve these high values of εβ p while at the same time increasing the value of beta to several times the Troyon beta limit. An approach to the study of this key question on beta limits using modest sized, large aspect ratio tokamaks is described. (author). 28 refs, 7 figs, 1 tab

  19. Seletividade de herbicidas aplicados em pré-emergência na cultura do algodão Selectivity of herbicides applied to pre-emergent cotton crops

    Directory of Open Access Journals (Sweden)

    Miriam Hiroko Inoue

    2013-03-01

    Full Text Available A cultura do algodão tem grande importância econômica e social, visto que é a fibra mais utilizada no setor têxtil. Contudo é uma cultura que apresenta alta sensibilidade a plantas daninhas e há poucos herbicidas seletivos à cultura. Neste contexto o trabalho objetivou avaliar a seletividade de herbicidas aplicados em pré-emergência na cultura do algodão. Os herbicidas alachlor, S-metolachlor, diuron, prometryne, trifluralin e oxyfluorfen foram aplicados isoladamente e em misturas sobre a variedade FMT-701, nas localidades de Diamantino-MT e Campos de Júlio-MT. O delineamento experimental utilizado foi em blocos casualizados com 16 tratamentos e 4 repetições. Para avaliar a seletividade foram realizadas avaliações de altura aos 36; 66 e 150 dias após a aplicação (DAA, fitointoxicação aos 14; 21; 29 e 36 DAA, estande aos 21 e 49 DAA, número de maçãs aos 141 DAA e produtividade do algodão em caroço aos 193 DAA. Os dados foram submetidos à análise conjunta e ao teste de agrupamento Scott-Knott (p>0,05. Os resultados indicaram que alguns tratamentos proporcionaram menor altura de plantas em determinadas avaliações e grande parte dos tratamentos causou injúrias na fase inicial da cultura. Verificou-se que os tratamentos não proporcionaram diferença significativa para as características de estande de plantas, número de maçãs e produtividade de algodão em caroço, comprovando que todos os tratamentos avaliados podem ser utilizados no manejo de plantas daninhas.The cultivation of cotton has great economic and social importance as it is the most widely used fibre in the textile sector. It is however a crop that is highly sensitive tweeds, and there are few selective herbicides for the crop. With this in mind, this study aimed to evaluate the selectivity of herbicides applied to pre-emergent cotton crops. The herbicides, alachlor, S-metolachlor, diuron, prometryne, trifluralin and oxyfluorfen were applied both

  20. Efeito residual de herbicidas aplicados em pré-emergência em diferentes solos Residual effect of herbicides applied in pre-emergence in different soils

    Directory of Open Access Journals (Sweden)

    M.H. Inoue

    2011-06-01

    Full Text Available O objetivo deste trabalho foi monitorar o efeito residual dos herbicidas ametryne, clomazone e diuron, aplicados em pré-emergência, utilizando amostras de um Neossolo Quartzarênico e de um Latossolo Vermelho, com texturas e composições contrastantes. Para isso, foram conduzidos seis bioensaios em casa de vegetação, com amostras de um Neossolo Quartzarênico (textura arenosa e de um Latossolo Vermelho (textura argilosa. Foi avaliado o efeito residual de ametryne (0, 1,60 e 2,40 kg ha-1, clomazone (0, 0,90 e 1,10 kg ha-1 e diuron (0, 1,60 e 3,20 kg ha-1, por meio de semeadura de bioindicador previamente selecionado (Cucumis sativus ou Brachiaria decumbens aos 0, 25, 50, 75 e 100 dias após a aplicação (DAA. Verificou-se que ametryne proporcionou 80% de controle até os 40 DAA, independentemente do solo e da dose. O clomazone apresentou efeito residual satisfatório quando aplicado na dose recomendada em solo argiloso, mantendo o controle acima de 80% até os 71 DAA. Em solo arenoso, o controle não foi satisfatório já aos 25 DAA, mesmo na dose recomendada para solo argiloso. Diuron apresentou alta estabilidade em solo argiloso, observando-se controle superior a 91% até os 100 DAA na dose recomendada e controle acima de 80% até os 54 DAA na dose recomendada para solo arenoso. No entanto, em solo arenoso não houve aumento do efeito residual, mesmo com a aplicação da dose recomendada para solo argiloso.The objective of this work was to monitor the residual effect of the herbicides ametryne, clomazone and diuron, applied in pre-emergence, using Psament and Red Latosol with contrasting texture and composition. Thus, six experiments were conducted under greenhouse conditions with samples of Psament (sandy texture and Red Latosol (clay texture. The residual effect of ametryne (0, 1.60 and 2.40 kg ha-1, clomazone (0, 0.90 and 1.10 kg ha-1 and diuron (0, 1.60 and 3.20 kg ha 1 was evaluated by sowing the test plant (Cucumis sativus or

  1. COMMON BEAN RESPONSE TO HEAT STRESS IN DIFFERENT PHENOLOGICAL STAGES RESPOSTA DO FEIJOEIRO COMUM AO ESTRESSE TÉRMICO APLICADO EM DIFERENTES ESTÁGIOS FENOLÓGICOS

    Directory of Open Access Journals (Sweden)

    Agostinho Dirceu Didonet

    2007-09-01

    Full Text Available

    High temperature reduces grain yield of common bean (Phaseolus vulgaris L. as a consequence of the abortion of reproductive structures. Heat stress was applied in common bean cultivars BRS Pérola and BRS Valente, in different phenological stages to verify grain yield reduction. Plants were grown in pots at 22C/18C day/night, 12/12 hours, without water and nutrients limitations and with preventive insect and disease control. At stages V4, R5, R7, and R8 plants were submitted to temperatures of 37C/25C day/night, 12/12 hours for 72 hours, in growth chamber and then returned to the initial conditions. Pod abortion was evaluated, and, at R9 stage, accumulated dry weight and yield components were evaluated. Heat stress applied at R5, R7 and R8 stage increased the number of pods per plant; however, grains per pod and dry weight per seed decreased. From the data obtained it can be concluded that incidence of high temperatures from R5 until R7 stages reduced grain yield and commercial grain quality of common beans.

    KEY-WORDS: Phaseolus vulgaris; pod abortion; biomass yield; temperature.

    Altas temperaturas podem reduzir o rendimento de grãos do feijoeiro comum (Phaseolus vulgaris L. cultivado em regiões tropicais, em decorrência do abortamento de estruturas reprodutivas. Para determinar o período fenológico em que a incidência de altas temperaturas acarreta maior redução no rendimento, foram aplicados estresses térmicos em diferentes estágios fenológicos de plantas de feijoeiro, das cultivares BRS Pérola e BRS Valente. As plantas foram cultivadas em vasos, sem limitação de água e nutrientes e com controle fitossanitário preventivo, em temperaturas de 22oC/18oC dia/noite, 12/12 horas. Nos estágios V4, R5, R7 e R8, as plantas foram submetidas a temperaturas de 37oC/25oC dia

  2. Modeling whistler wave generation regimes in magnetospheric cyclotron maser

    Directory of Open Access Journals (Sweden)

    D. L. Pasmanik

    2004-11-01

    Full Text Available Numerical analysis of the model for cyclotron instability in the Earth's magnetosphere is performed. This model, based on the self-consistent set of equations of quasi-linear plasma theory, describes different regimes of wave generation and related energetic particle precipitation. As the source of free energy the injection of energetic electrons with transverse anisotropic distribution function to the interaction region is considered. A parametric study of the model is performed. The main attention is paid to the analysis of generation regimes for different characteristics of energetic electron source, such as the shape of pitch angle distributions and its intensity. Two mechanisms of removal of energetic electrons from a generation region are considered, one is due to the particle precipitation through the loss cone and another one is related to the magnetic drift of energetic particles.

    It was confirmed that two main regimes occur in this system in the presence of a constant particle source, in the case of precipitation losses. At small source intensity relaxation oscillations were found, whose parameters are in good agreement with simplified analytical theory developed earlier. At a larger source intensity, transition to a periodic generation occurs. In the case of drift losses the regime of self-sustained periodic generation regime is realized for source intensity higher than some threshold. The dependencies of repetition period and dynamic spectrum shape on the source parameters were studied in detail. In addition to simple periodic regimes, those with more complex spectral forms were found. In particular, alteration of spikes with different spectral shape can take place. It was also shown that quasi-stationary generation at the low-frequency band can coexist with periodic modulation at higher frequencies.

    On the basis of the results obtained, the model for explanation of

  3. The legacy of large regime shifts in shallow lakes.

    Science.gov (United States)

    Ramstack Hobbs, Joy M; Hobbs, William O; Edlund, Mark B; Zimmer, Kyle D; Theissen, Kevin M; Hoidal, Natalie; Domine, Leah M; Hanson, Mark A; Herwig, Brian R; Cotner, James B

    2016-12-01

    Ecological shifts in shallow lakes from clear-water macrophyte-dominated to turbid-water phytoplankton-dominated are generally thought of as rapid short-term transitions. Diatom remains in sediment records from shallow lakes in the Prairie Pothole Region of North America provide new evidence that the long-term ecological stability of these lakes is defined by the legacy of large regime shifts. We examine the modern and historical stability of 11 shallow lakes. Currently, four of the lakes are in a clear-water state, three are consistently turbid-water, and four have been observed to change state from year to year (transitional). Lake sediment records spanning the past 150-200 yr suggest that (1) the diatom assemblage is characteristic of either clear or turbid lakes, (2) prior to significant landscape alteration, all of the lakes existed in a regime of a stable clear-water state, (3) lakes that are currently classified as turbid or transitional have experienced one strong regime shift over the past 150-200 yr and have since remained in a regime where turbid-water predominates, and (4) top-down impacts to the lake food-web from fish introductions appear to be the dominant driver of strong regime shifts and not increased nutrient availability. Based on our findings we demonstrate a method that could be used by lake managers to identify lakes that have an ecological history close to the clear-turbid regime threshold; such lakes might more easily be returned to a clear-water state through biomanipulation. The unfortunate reality is that many of these lakes are now part of a managed landscape and will likely require continued intervention. © 2016 by the Ecological Society of America.

  4. Séries temporais de NDVI do sensor SPOT Vegetation e algoritmo SAM aplicados ao mapeamento de cana‑de‑açúcar

    Directory of Open Access Journals (Sweden)

    Luiz Eduardo Vicente

    2012-09-01

    Full Text Available O objetivo deste trabalho foi avaliar o mapeamento de área de cana‑de‑açúcar por meio de série temporal, de seis anos de dados do índice de vegetação por diferença normalizada (NDVI, oriundos do sensor Vegetation, a bordo do satélite "système pour l'observation de la Terre" (SPOT. Três classes de cobertura do solo (cana‑de‑açúcar, pasto e floresta, do Estado de São Paulo, foram selecionadas como assinaturas espectro‑temporais de referência, que serviram como membros extremos ("endmembers" para classificação com o algoritmo "spectral angle mapper" (SAM. A partir desta classificação, o mapeamento da área de cana‑de‑açúcar foi realizado com uso de limiares na imagem-regra do SAM, gerados a partir dos valores dos espectros de referência. Os resultados mostram que o algoritmo SAM pode ser aplicado a séries de dados multitemporais de resolução moderada, o que permite eficiente mapeamento de alvo agrícola em escala mesorregional. Dados oficiais de áreas de cana‑de‑açúcar, para as microrregiões paulistas, apresentam boa correlação (r² = 0,8 com os dados obtidos pelo método avaliado. A aplicação do algoritmo SAM mostrou ser útil em análises temporais. As séries temporais de NDVI do sensor SPOT Vegetation podem ser utilizadas para mapeamento da área de cana‑de‑açúcar em baixa resolução.

  5. Ejes de Vigilancia Tecnológica Aplicados en Universidades con Estudios a Distancia (Axes of Technological Surveillance Applied in Distance Learning Universities

    Directory of Open Access Journals (Sweden)

    Arlin J. Izarra Reverol

    2014-08-01

    Full Text Available Resumen El objetivo de la presente investigación es determinar los ejes de la vigilancia tecnológica aplicados en las Universidades del Municipio Maracaibo que ofrecen estudios a distancia, siguiendo los aportes teóricos de López et al. (2007, Palop y Vicente (1999, Martinet y Ribault (1989, Escorsa y Valls (2005, Fundación COTEC (1999 y Jakobiak (1995. La investigación es descriptiva, con un diseño no experimental transeccional de campo. La población la conforman doce directores y coordinadores (censo poblacional, a quienes se aplicó un cuestionario con preguntas cerradas y opciones de frecuencia, validado y con alta confiabilidad (0.90. Los datos obtenidos fueron interpretados a través del análisis y discusión de información estadística. Los resultados adquiridos indican que se aplican los ejes de vigilancia tecnológica en las universidades seleccionadas, enfatizando los siguientes elementos de estudio: la vigilancia competitiva, la vigilancia comercial, la vigilancia tecnológica propiamente dicha y la vigilancia de los entornos. Abstract The aim of this research is to determine the axes of technological surveillance applied in the universities of Maracaibo Municipality including distance learning, following the theoretical contributions of López et al. (2007, Palop and Vicente (1999, Martinet and Ribault (1989 Escorsa and Valls (2005, COTEC Foundation (1999 and Jakobiak (1995. This research is descriptive, based on a experimental design. The population consisted of twelve directors and coordinators (residents, who answered a questionnaire with closed questions and frequency options. This was validated with high reliability (0.90. The data obtained were interpreted through analysis and discussion of statistical information. The results indicate that the axes of technological surveillance are applied in the selected universities, emphasizing the following elements of study: competitive surveillance, commercial surveillance

  6. Custeio Baseado em Atividades (ABC Aplicado ao Setor Público: Estudo de Caso no Colégio Militar do Rio de Janeiro (CMRJ

    Directory of Open Access Journals (Sweden)

    Luis Paulo Faria Carmo, Lino Martins Silva

    2011-04-01

    Full Text Available O objetivo desta pesquisa foi verificar se o método de Custeio Baseado em Atividades (ABC é adequado para ser aplicado na mensuração dos custos educacionais no Colégio Militar do Rio de Janeiro. Embora a Lei federal nº. 4.320/64 já determinasse a necessidade de apuração dos custos, ingressos e resultados, a Administração Pública ainda não sabe quanto custa cada uma de suas atividades. A relevância do tema deriva da necessidade de as Organizações Públicas de permitir o acompanhamento e a avaliação de sua gestão. Porém, o Sistema Integrado de Administração Financeira do Governo Federal (SIAFI, principal ferramenta do governo, não evidencia em suas contas o custo de cada atividade. A metodologia utilizada teve como “principal finalidade desenvolver, esclarecer e modificar idéias a fim de fornecer hipótese pesquisável para estudos posteriores” (Tripodi, Fellin e Meyer, 1981, p.64 e como fontes de pesquisa a revisão bibliográfica e a análise documental, sendo utilizado como estratégia metodológica de um estudo de caso real no Colégio Militar do Rio de Janeiro (CMRJ. A análise dos resultados aponta ser adequada a aplicação do método de Custeio Baseado em Atividades (ABC para evidenciação dos custos das atividades educacionais, bem como subsidiar a avaliação da qualidade do gasto Público.

  7. Percepción del enfoque gerencial y del modelo de acreditación por alta calidad aplicado en universidades colombianas

    Directory of Open Access Journals (Sweden)

    Adriana P. Uribe Urán

    2014-06-01

    Full Text Available El artículo presenta un análisis del modelo de acreditación por alta calidad de programas universitarios implementado en Colombia y del enfoque gerencial que caracteriza a las universidades a la luz de las perspectivas teóricas analizadas para tal fin. La investigación da cuenta de las percepciones encontradas en un grupo de actores relacionados directamente con el proceso administrativo de universidades colombianas. Se emplea la metodología cualitativa porque permite de manera flexible el análisis e interpretación del tema de estudio y se acude a los métodos fenomenológico y hermenéutico por su validez en el logro de la objetividad y comprensión del fenómeno investigado. Como técnica de recolección de la información se utilizó la entrevista semiestructurada a directivos académicos. Los resultados encontrados no son generalizables, simplemente miden percepciones de un grupo de actores y pueden ser un parámetro orientador de una realidad. La percepción encontrada con respecto al enfoque gerencial aplicado en las universidades colombianas, indica que están siendo gestionadas bajo los enfoques tradicionalmente empleados en las empresas de tipo productivo y son basados en la aplicación del proceso administrativo para el logro de la eficiencia y la eficacia. Con respecto al actual modelo de acreditación por alta calidad implementado en universidades se encuentra que este debería ser contextualizado de acuerdo con las condiciones específicas de las universidades sometidas al proceso, porque aunque permite mejoras en el proceso educativo y en las condiciones de prestación del servicio, es poco equitativo y sus resultados no son sostenidos en el tiempo

  8. Modelo de accesibilidad de conceptos matematicos aplicados en el curso de Astronomia Descriptiva para estudiantes con impedimentos visuales en la UPR

    Science.gov (United States)

    Isidro Villamizar, Gloria Maria

    Este estudio utiliza metodologia de investigacion cualitativa, con el proposito de describir, analizar y evaluar los procesos de diseno y desarrollo de un modelo de accesibilidad que consiste en estrategias de ensenanza de las matematicas para estudiantes con impedimentos visuales matriculados en el curso de Astronomia Descriptiva en la UPR. Se utilizaron las siguientes estrategias para recopilar la informacion, 1) reflexiones de la investigadora en el proceso de diseno y desarrollo de las lecciones adaptadas, que se registraron en un diario reflexivo. 2) entrevista semiestructurada luego de haber trabajado las lecciones de aprendizaje adaptadas con los participantes. 3) observaciones y notas de la investigadora del trabajo de los participantes. Para obtener la informacion de los participantes se obtuvo los permisos institucionales necesarios; se seleccionaron los participantes y se validaron los instrumentos; se realizo el desarrollo de las lecciones adaptadas con los participantes; y finalmente, se analizo la informacion obtenida. El diseno de las lecciones de aprendizaje adaptadas se hizo siguiendo las recomendaciones curriculares de los temas de matematicas aplicados en el curso de Astronomia Descriptiva realizado por la investigadora durante su semestre de internado. El testimonio de las voces de los participantes se obtuvo del proceso de desarrollo de las lecciones de aprendizaje adaptadas de temas seleccionados de conceptos matematicos requeridos en el curso de Astronomia Descriptiva y de la entrevista semiestructurada con los participantes, luego de haber trabajado las lecciones de aprendizaje. Para el desarrollo de las lecciones de aprendizaje, se utilizaron materiales tactiles adaptados, materiales tactiles disenados y materiales disponibles comercialmente. Los textos de las lecciones se imprimieron en tinta y en Braille. Se exhorta a disenar y desarrollar estrategias de ensenanza accesibles, considerando como recursos para evaluar su efectividad a

  9. Ocean Wave Energy Regimes of the Circumpolar Coastal Zones

    Science.gov (United States)

    Atkinson, D. E.

    2004-12-01

    Ocean wave activity is a major enviromental forcing agent of the ice-rich sediments that comprise large sections of the arctic coastal margins. While it is instructive to possess information about the wind regimes in these regions, direct application to geomorphological and engineering needs requires knowledge of the resultant wave-energy regimes. Wave energy information has been calculated at the regional scale using adjusted reanalysis model windfield data. Calculations at this scale are not designed to account for local-scale coastline/bathymetric irregularities and variability. Results will be presented for the circumpolar zones specified by the Arctic Coastal Dynamics Project.

  10. Typification of the thermal regime of the air in Nicaragua

    International Nuclear Information System (INIS)

    Lecha Estela, Luis; Hernandez Perez, Vidal; Prado Zambrana, Carmen

    1994-01-01

    In this work it is applied the method of thermal regime classification in order to evaluate the heat resources of the country, as a first step to know and to employ, rationally, the national climatic resources. It is analyzed the interaction between the spatio-temporal distribution of the thermal regime and the main climatic factors, showing the differences encountered between each geographic zone of the country and, moreover, they vertical structure. The results have applied utility in several branches of the national economy and they were included in the work to prepare the Climatic Atlas of Nicaragua

  11. Transport regimes spanning magnetization-coupling phase space

    Science.gov (United States)

    Baalrud, Scott D.; Daligault, Jérôme

    2017-10-01

    The manner in which transport properties vary over the entire parameter-space of coupling and magnetization strength is explored. Four regimes are identified based on the relative size of the gyroradius compared to other fundamental length scales: the collision mean free path, Debye length, distance of closest approach, and interparticle spacing. Molecular dynamics simulations of self-diffusion and temperature anisotropy relaxation spanning the parameter space are found to agree well with the predicted boundaries. Comparison with existing theories reveals regimes where they succeed, where they fail, and where no theory has yet been developed.

  12. The French regime of civil liability for nuclear

    International Nuclear Information System (INIS)

    Leger, Marc

    2013-01-01

    As civil liability for nuclear is a matter of discussion and initiatives at the European and international levels, the author proposes an overview of the legal framework of the French regime of civil liability for nuclear which is a combination of two international treaties (Paris and Brussels conventions) and a national arrangement (a 1968 law). He presents and comments the main characteristics of this regime (geographical scope of application, concerned activities, excluded events, covered damages, principles regarding operator's liability) and the improvements brought by Paris and Brussels convention review protocols

  13. NAZI REGIME IN THE PERIODICAL A NOTÍ­CIA.

    Directory of Open Access Journals (Sweden)

    Bruna Luíza Barcellos

    2009-08-01

    Full Text Available The periodical A Notícia, of Joinville, city colonized for Germans, supported the nazi regime since the ascension of Adolf Hitler to the power. Between 1932 and 1944, some editions had printed the figure of Hitler and the nazi symbol, beyond dither messages to that regime. Based in the Análise de conteúdo (BARDIN, 1977, this article searchs to understand the representation made for the periodical A Notícia on this historical landmark, in other words, bring to the light the consequences of a part of occured world-wide history in catarinense territory.

  14. Selection Criteria in Regime Switching Conditional Volatility Models

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    Thomas Chuffart

    2015-05-01

    Full Text Available A large number of nonlinear conditional heteroskedastic models have been proposed in the literature. Model selection is crucial to any statistical data analysis. In this article, we investigate whether the most commonly used selection criteria lead to choice of the right specification in a regime switching framework. We focus on two types of models: the Logistic Smooth Transition GARCH and the Markov-Switching GARCH models. Simulation experiments reveal that information criteria and loss functions can lead to misspecification ; BIC sometimes indicates the wrong regime switching framework. Depending on the Data Generating Process used in the experiments, great care is needed when choosing a criterion.

  15. Champagne experiences various rhythmical bubbling regimes in a flute.

    Science.gov (United States)

    Liger-Belair, Gérard; Tufaile, Alberto; Jeandet, Philippe; Sartorelli, José-Carlos

    2006-09-20

    Bubble trains are seen rising gracefully from a few points on the glass wall (called nucleation sites) whenever champagne is poured into a glass. As time passes during the gas-discharging process, the careful observation of some given bubble columns reveals that the interbubble distance may change suddenly, thus revealing different rhythmical bubbling regimes. Here, it is reported that the transitions between the different bubbling regimes of some nucleation sites during gas discharging is a process which may be ruled by a strong interaction between tiny gas pockets trapped inside the nucleation site and/or also by an interaction between the tiny bubbles just blown from the nucleation site.

  16. Development and current trends in the international nonproliferation regime

    International Nuclear Information System (INIS)

    Sessoms, A.L.

    1984-01-01

    The IAEA and its safeguards system is placed into a historical perspective. A personal perspective on the nonproliferation regime and on the Agency's role in it is then presented. This is done initially by discussing some of the landmark events in the history of the nonproliferation regime. Subsequently some of the history of arms control agreements and of the role of the IAEA are noted. Then political motivations of state and ways the Agency has an impact in the political nonproliferation sphere are addressed

  17. Cooling metals to the microkelvin regime, then and now

    Science.gov (United States)

    Pickett, G. R.

    2000-05-01

    Better understanding of the behaviour of materials and the techniques of nuclear cooling, gained in recent years, now allows us to cool metallic samples to the microkelvin regime, with hold times at the higher temperatures of tens of hours. In the early days of nuclear cooling when sources of heat leaks were hardly understood, such performance would have appeared an impossible dream. However, we are now at the point where solid state experiments can be realistically contemplated in the sub- 10 μK regime.

  18. The superradiant instability regime of the spinning Kerr black hole

    Science.gov (United States)

    Hod, Shahar

    2016-07-01

    Spinning Kerr black holes are known to be superradiantly unstable to massive scalar perturbations. We here prove that the instability regime of the composed Kerr-black-hole-massive-scalar-field system is bounded from above by the dimensionless inequality Mμ r+ is the dimensionless ratio between the horizon radii of the black hole. It is further shown that this analytically derived upper bound on the superradiant instability regime of the spinning Kerr black hole agrees with recent numerical computations of the instability resonance spectrum.

  19. Regime switches in the risk-return trade-off

    OpenAIRE

    Marcellino, Massimiliano; Ghysels, Eric; Guerin, Pierre

    2014-01-01

    This paper deals with the estimation of the risk-return trade-off. We use a MIDAS model for the conditional variance and allow for possible switches in the risk-return relation through a Markov-switching specification. We find strong evidence for regime changes in the risk-return relation. This finding is robust to a large range of specifications. In the first regime characterized by low ex-post returns and high volatility, the risk-return relation is reversed, whereas the intuitive positive ...

  20. Search for a new exchange-rate regime.

    Science.gov (United States)

    Williamson, J

    1987-07-31

    The regime of unmanaged floating exchange rates was implicitly judged a failure when, with the Plaza Agreement, attempts at cooperative exchange-rate management were reintroduced primarily because of concern at the size of misalignments. Any satisfactory successor regime will need to limit misalignments while retaining the genuine social benefits of exchange-rate flexibility. It is argued that a system of target zones for exchange rates, ideally embedded in a more comprehensive set of guidelines for international economic policy coordination, could best reconcile these needs.

  1. Dinâmica do herbicida metribuzin aplicado sobre palha de cana-de-açúcar (Saccarum officinarum Performance of metribuzin apllied on sugarcane straw

    Directory of Open Access Journals (Sweden)

    C.V.S Rossi

    2013-03-01

    Full Text Available O herbicida metribuzin é recomendado para o controle de plantas daninhas na cultura de cana-de-açúcar. Entretanto, seu comportamento em áreas com colheita mecânica, que deixa grande quantidade de palha sobre o solo, não é bem conhecido. Este trabalho objetivou avaliar a dinâmica do herbicida metribuzin aplicado sobre diferentes quantidades de palha de cana-de-açúcar, períodos e intensidades de chuvas após a aplicação. Foram realizados três ensaios para avaliar a dinâmica do metribuzin aplicado sobre a palha de cana-de-açúcar. No primeiro, foi avaliada a interceptação do herbicida por 0, 1, 2,5, 5, 7,5, 10, 15 e 20 t de palha de cana-de-açúcar por hectare. No segundo, avaliou-se a lixiviação do metribuzin em 5, 10, 15 e 20 t de palha por hectare sob simulação de chuva de 2,5, 5, 10, 15, 20, 35, 50 e 100 mm, um dia após a aplicação (DAA. No terceiro, foi avaliado o efeito dos intervalos de tempo entre a aplicação do herbicida e a primeira chuva na lixiviação do metribuzin (0, 1, 7, 14 e 28 dias em 10 t de palha por hectare, em função das mesmas precipitações simuladas no segundo ensaio. Os resultados obtidos no segundo e terceiro ensaios foram ajustados pelo modelo de Mitscherlich. A quantificação do herbicida foi realizada por cromatografia líquida de alta eficiência. A quantidade de metribuzin que transpõe as diferentes quantidades de palha com simulação acumulada de 100 mm de chuva é diferenciada, sendo maior para 5 t ha-1 e menor para quantidades maiores, até 20 t ha-1. A simulação média de chuvas equivalentes a de 20 a 30 mm iniciais é suficiente para promover uma transposição maior que 99% do metribuzin. Este herbicida é retido quando aplicado sobre a palha de cana-de-açúcar e permanece por períodos de até 28 DAA sem chuva.The herbicide metribuzin is recommended for weed control of sugarcane crops. However, the behavior of this herbicide on the straw left on the soil surface of

  2. Transient dynamics of a quantum-dot: From Kondo regime to mixed valence and to empty orbital regimes

    Science.gov (United States)

    Cheng, YongXi; Li, ZhenHua; Wei, JianHua; Nie, YiHang; Yan, YiJing

    2018-04-01

    Based on the hierarchical equations of motion approach, we study the time-dependent transport properties of a strongly correlated quantum dot system in the Kondo regime (KR), mixed valence regime (MVR), and empty orbital regime (EOR). We find that the transient current in KR shows the strongest nonlinear response and the most distinct oscillation behaviors. Both behaviors become weaker in MVR and diminish in EOR. To understand the physical insight, we examine also the corresponding dot occupancies and the spectral functions, with their dependence on the Coulomb interaction, temperature, and applied step bias voltage. The above nonlinear and oscillation behaviors could be understood as the interplay between dynamical Kondo resonance and single electron resonant-tunneling.

  3. Civic Capacity in Educational Reform Efforts: Emerging and Established Regimes in Rust Belt Cities

    Science.gov (United States)

    Mitra, Dana L.; Frick, William C.

    2011-01-01

    Using urban regime theory, the article examines two Rust Belt cities that tried to break the cycle of social reproduction in their communities by reforming their schools. The article contributes to the development of urban regime theory by comparing an "emerging" regime to an "established" regime. The comparison highlights the interdependent…

  4. Transition from the constant ion mobility regime to the ion-atom charge-exchange regime for bounded collisional plasmas

    International Nuclear Information System (INIS)

    Poggie, Jonathan; Sternberg, Natalia

    2005-01-01

    A numerical and analytical study of a planar, collisional, direct-current, plasma-wall problem is presented. The fluid model for the problem is first validated by comparing numerical solutions with experimental data for low-pressure (∼0.1 Pa) electrode sheaths with wall potentials on the order of -100 V. For electric potential, ion number density, and ion velocity, good agreement was found between theory and experiment from within the sheath out to the bulk plasma. The frictional drag resulting from ion-neutral collisions is described by a model incorporating both linear and quadratic velocity terms. In order to study the transition from the constant ion mobility regime (linear friction) to the ion-atom charge-exchange collision regime (quadratic friction), the theoretical model was examined numerically for a range of ion temperatures and ion-neutral collision rates. It was found that the solution profiles in the quasineutral plasma depend on the ion temperature. For low ion temperatures they are governed mainly by the ion-atom charge-exchange regime, whereas for high temperatures they are governed by the constant ion mobility regime. Quasineutral plasma models corresponding to these two limiting cases were solved analytically. In particular, an analytical plasma solution is given for the ion-atom charge exchange regime that includes the effects of ion inertia. In contrast to the quasineutral plasma, the sheath is always governed for low to moderate collision rates by the ion-atom charge-exchange regime, independent of the ion temperature. Varying the collision rate, it was shown that when the wall potential is sufficiently high, the sheath cannot be considered collisionless, even if the collision rate is quite small

  5. The Gulf crisis (1990-91) and the Kuwait regime : legitimacy and stability in a rentier state Gulf crisis (1990-91) and the Kuwait regime

    OpenAIRE

    Maktabi, Rania

    1992-01-01

    THE GULF CRISIS (1990-91) & THE KUWAITI REGIME - LEGITIMACY AND STABILITY IN A RENTIER STATE Among the central questions I address are: What are the factors that contribute to regime stability in Kuwait? How do we understand the relationship between rulers and ruled? In which ways did the regime maintain political authority during the Crisis, and how does it ensure its stability after the experience of the Crisis? It is argued that the legitimacy of the Kuwaiti regime could be seen a...

  6. Just for Fun? The Emotional Regime of Experiential Consumption

    DEFF Research Database (Denmark)

    Jantzen, Christian; Fitchett, James; Østergaard, Per

    2012-01-01

    Experiential consumption emphasizes emotional and hedonic qualities in the marketplace stressing the importance of experiences for ‘the good life’ and positioning consumption as a legitimate way to generate interesting and relevant experiences. The concept of emotional regimes (Reddy, 2001) is used...

  7. Effects of different irrigation regimes on vegetative growth, fruit yield ...

    African Journals Online (AJOL)

    ONOS

    2010-09-06

    Sep 6, 2010 ... This study was conducted during five growing seasons from 2004 to 2008 to investigate effects of different irrigation regimes on vegetative growth, fruit yield and quality of Salak apricot trees in semi- arid climatic conditions. ... is very important to know the critical stages of fruit development and the final ...

  8. Operating regimes of signaling cycles: statics, dynamics, and noise filtering.

    Directory of Open Access Journals (Sweden)

    Carlos Gomez-Uribe

    2007-12-01

    Full Text Available A ubiquitous building block of signaling pathways is a cycle of covalent modification (e.g., phosphorylation and dephosphorylation in MAPK cascades. Our paper explores the kind of information processing and filtering that can be accomplished by this simple biochemical circuit. Signaling cycles are particularly known for exhibiting a highly sigmoidal (ultrasensitive input-output characteristic in a certain steady-state regime. Here, we systematically study the cycle's steady-state behavior and its response to time-varying stimuli. We demonstrate that the cycle can actually operate in four different regimes, each with its specific input-output characteristics. These results are obtained using the total quasi-steady-state approximation, which is more generally valid than the typically used Michaelis-Menten approximation for enzymatic reactions. We invoke experimental data that suggest the possibility of signaling cycles operating in one of the new regimes. We then consider the cycle's dynamic behavior, which has so far been relatively neglected. We demonstrate that the intrinsic architecture of the cycles makes them act--in all four regimes--as tunable low-pass filters, filtering out high-frequency fluctuations or noise in signals and environmental cues. Moreover, the cutoff frequency can be adjusted by the cell. Numerical simulations show that our analytical results hold well even for noise of large amplitude. We suggest that noise filtering and tunability make signaling cycles versatile components of more elaborate cell-signaling pathways.

  9. Prolonged Instability Prior to a Regime Shift | Science ...

    Science.gov (United States)

    Regime shifts are generally defined as the point of ‘abrupt’ change in the state of a system. However, a seemingly abrupt transition can be the product of a system reorganization that has been ongoing much longer than is evident in statistical analysis of a single component of the system. Using both univariate and multivariate statistical methods, we tested a long-term high-resolution paleoecological dataset with a known change in species assemblage for a regime shift. Analysis of this dataset with Fisher Information and multivariate time series modeling showed that there was a∼2000 year period of instability prior to the regime shift. This period of instability and the subsequent regime shift coincide with regional climate change, indicating that the system is undergoing extrinsic forcing. Paleoecological records offer a unique opportunity to test tools for the detection of thresholds and stable-states, and thus to examine the long-term stability of ecosystems over periods of multiple millennia. This manuscript explores various methods of assessing the transition between alternative states in an ecological system described by a long-term high-resolution paleoecological dataset.

  10. Institutional Regimes and Induced Dependency in Homes for the Aged.

    Science.gov (United States)

    Booth, Tim

    1986-01-01

    Reports effects of institutional regimes on levels of dependency among residents of public homes for the elderly in England. Differences in management practices and caring routines did not affect the creation or reduction of dependency among residents. Questions the rationale that informs some current notions of good practice in residential work.…

  11. Effects of different irrigation regimes on vegetative growth, fruit yield ...

    African Journals Online (AJOL)

    This study was conducted during five growing seasons from 2004 to 2008 to investigate effects of different irrigation regimes on vegetative growth, fruit yield and quality of Salak apricot trees in semiarid climatic conditions. There were six irrigation treatments, five of which (S1, S2, S3, S4 and S5) were based on adjustment ...

  12. The socialist regime: The intellectual origin of the images

    Directory of Open Access Journals (Sweden)

    Dmitry Shlapentokh

    2014-01-01

    Full Text Available Every phenomenon exists in several dimensions. It has several ontological attributes, so to speak, which provide opportunities for a variety of interpretations. The Bolshevik Revolution and the Soviet regime could be an example. At the beginning of Soviet history the revolution was seen as the beginning of a worldwide revolution opening an era of liberation for workers all over the world. As the Soviet regime solidified its position, the hope for worldwide revolution faded. In the new context, observers, especially outside Russia, looked at the regime from a different perspective. For them it represented the country's national interests, and its socialist slogans should not be taken at face value. Some believed post-revolutionary Russia was similar to post-revolutionary France and was experiencing its “Thermidor.” Others assumed the revolution showed Russia as a “Eurasian” state where all ethnic/religious groups lived in “symbiosis.” Finally, some assumed the Soviet regime would lead to the transformation of the human species and the human conquest of cosmos. This transition from one image to another does not mean that one illusion, one “wrong” image, follows another. It also does not mean the very notion of true meaning is meaningless simply because no reality exists as a fixed entity, and one could therefore “construct” any type of reality. It simply means that there are many attributes of the revolution, which are revealed in the course of time.

  13. Characterization of the Tokamak Novillo in cleaning regime

    International Nuclear Information System (INIS)

    Lopez C, R.; Melendez L, L.; Valencia A, R.; Chavez A, E.; Colunga S, S.; Gaytan G, E.

    1992-02-01

    In this work the obtained results of the investigation about the experimental characterization of those low energy pulsed discharges of the Tokamak Novillo are reported. With this it is possible to fix the one operation point but appropriate of the Tokamak to condition the chamber in the smallest possible time for the cleaning discharges regime before beginning the main discharge. The characterization of the cleaning discharges in those Tokamaks is an unique process and characteristic of each device, since the good points of operation are consequence of those particularities of the design of the machine. In the case of the Tokamak Novillo, besides characterizing it a contribution is made to the cleaning discharges regime which consists on the one product of the current peak to peak of plasma by the duration of the discharge Ip t like reference parameter for the optimization of the operation of the device in the cleaning discharge regime. The maximum value of the parameter I (p) t, under different work conditions, allowed to find the good operation point to condition the discharges chamber of the Tokamak Novillo in short time and to arrive to a regime in which is not necessary the preionization for the obtaining of the cleaning discharges. (Author)

  14. Regime shifts, resilience and recovery of a cod stock

    DEFF Research Database (Denmark)

    Lindegren, Martin; Diekmann, Rabea; Möllmann, Christian

    2010-01-01

    In the North and Baltic seas Atlantic cod Gadus morhua stocks collapsed as part or one of the major factors inducing large-scale ecosystem regime shifts. Determining the relative contribution of overfishing and climate variability in causing these shifts has proven difficult. While facing similar...

  15. Enrolment regimes and gender differences in university of mines ...

    African Journals Online (AJOL)

    These perceptions, the general dislike for engineering courses by most females for fear of mathematics and the knowledge of the fact that engineering is quite difficult, explain the phenomenon of female under-representation in the mines. Though the progressive feminine enrolment regimes, due to gender main streaming ...

  16. Politics, welfare regimes, and population health: controversies and evidence.

    Science.gov (United States)

    Muntaner, Carles; Borrell, Carme; Ng, Edwin; Chung, Haejoo; Espelt, Albert; Rodriguez-Sanz, Maica; Benach, Joan; O'Campo, Patricia

    2011-09-01

    In recent years, a research area has emerged within social determinants of health that examines the role of politics, expressed as political traditions/parties and welfare state characteristics, on population health. To better understand and synthesise this growing body of evidence, the present literature review, informed by a political economy of health and welfare regimes framework, located 73 empirical and comparative studies on politics and health, meeting our inclusion criteria in three databases: PubMed (1948-), Sociological Abstracts (1953-), and ISI Web of Science (1900-). We identified two major research programmes, welfare regimes and democracy, and two emerging programmes, political tradition and globalisation. Primary findings include: (1) left and egalitarian political traditions on population health are the most salutary, consistent, and substantial; (2) the health impacts of advanced and liberal democracies are also positive and large; (3) welfare regime studies, primarily conducted among wealthy countries, find that social democratic regimes tend to fare best with absolute health outcomes yet consistently in terms of relative health inequalities; and (4) globalisation defined as dependency indicators such as trade, foreign investment, and national debt is negatively associated with population health. We end by discussing epistemological, theoretical, and methodological issues for consideration for future research. © 2011 The Authors. Sociology of Health & Illness © 2011 Foundation for the Sociology of Health & Illness/Blackwell Publishing Ltd.

  17. The Treaty of Lisbon and the European Border Control Regime

    Directory of Open Access Journals (Sweden)

    Marianne Takle

    2012-08-01

    Full Text Available The question raised in the article is how the new provisions of the Lisbon Treaty and the Stockholm programme concerning the EU’s asylum and migration policy might consolidate existing trends within the European border control regime. The regime is defined by a combination of three features: (i a harmonisation of categories among the EU/Schengen member states, (ii a growing use of new technology in networked databases and (iii an increasing sorting of individuals based on security concerns. Although none of these features is new, the combination gives a new impetus to the European border control regime. The article concludes that the Lisbon Treaty and the Stockholm programme consolidate and strengthen existing trends. This implies that policies on border control, asylum, immigration, judicial cooperation and police cooperation are consolidated in a broader approach to border control, and that there is a strengthening of EU foreign policy within the European border control regime. The boundaries between previously dispersed policy areas are blurred. The combination of different aspects of security and various levels of authority requires coordination of policies with substantially different goals, and goes beyond mere border control.

  18. Scaling electron acceleration in the bubble regime for upcoming lasers

    International Nuclear Information System (INIS)

    Jansen, O.; Tueckmantel, T.; Pukhov, A.

    2014-01-01

    Electron acceleration in the laser-plasma bubble appeared to be the most successful regime of laser wake field acceleration in the last decade. The laser technology became mature enough to generate short and relativistically intense pulses required to reach the bubble regime naturally delivering quasi-monoenergetic bunches of relativistic electrons. The upcoming laser technology projects are promising short pulses with many times more energy than the existing ones. The natural question is how will the bubble regime scale with the available laser energy. We present here a parametric study of laser-plasma acceleration in the bubble regime using full three dimensional particle-in-cell simulations and compare numerical results with the analytical scalings from the relativistic laser-plasma similarity theory. Our simulations and the theory match almost perfectly for spot sizes above R = 2λ and laser amplitudes above a 0 = 4. We also studied the emission of synchrotron radiation by the accelerated electrons. Both classical and a QED model were applied. We found borders, at which theory and simulations stopped matching. With small spot radii (R < 2λ) we almost never observed the formation of a bubble structure or any form of mono-energetic acceleration. Low laser amplitudes lead to higher energies than predicted by the theory

  19. Calculation of the thermal regime of a stepped combustion chamber

    Energy Technology Data Exchange (ETDEWEB)

    Baskarev, B.N.; Gilevich, D.D.; Ostras, V.N.; Shvarts, IU.G.

    1985-01-01

    The effective-length method is used to calculate the heat-transfer characteristics and thermal regime of the walls of a stepped scramjet combustor. Based on this method, a formula is proposed for calculating heat transfer between the transition boundary layer and a nonporous surface. 13 references.

  20. Multi-fluid modeling of low-recycling divertor regimes

    International Nuclear Information System (INIS)

    Smirnov, R.D.; Pigarov, A.Yu.; Krasheninnikov, S.I.; Rognlien, T.D.; Soukhanovskii, V.A.; Rensink, M.E.; Maingi, R.; Skinner, C.H.; Stotler, D.P.; Bell, R.E.; Kugel, H.W.

    2010-01-01

    The low-recycling regimes of divertor operation in a single-null NSTX magnetic configuration are studied using computer simulations with the edge plasma transport code UEDGE. The edge plasma transport properties pertinent to the low-recycling regimes are demonstrated. These include the flux-limited character of the parallel heat transport and the high plasma temperatures with the flattened profiles in the scrape-off-layer. It is shown that to maintain the balance of particle fluxes at the core interface the deuterium gas puffing rate should increase as the divertor recycling coefficient decreases. The radial profiles of the heat load to the outer divertor plate, the upstream radial plasma profiles, and the effects of the cross-field plasma transport in the low-recycling regimes are discussed. It is also shown that recycling of lithium impurities evaporating from the divertor plate at high surface temperatures can reverse the low-recycling divertor operational regime to the high-recycling one and may cause thermal instability of the divertor plate (copyright 2010 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim) (orig.)

  1. Multi-Fluid Modeling of Low-Recycling Divertor Regimes

    International Nuclear Information System (INIS)

    Smirnov, R.D.; Pigarov, A.Y.; Krasheninnikov, S.I.; Rognlien, T.D.; Soukhanovskii, V.A.; Rensink, M.E.; Maingi, R.; Skinner, C.H.; Stotler, D.P.; Bell, R.E.; Kugel, H.W.

    2010-01-01

    The low-recycling regimes of divertor operation in a single-null NSTX magnetic configuration are studied using computer simulations with the edge plasma transport code UEDGE. The edge plasma transport properties pertinent to the low-recycling regimes are demonstrated. These include the flux-limited character of the parallel heat transport and the high plasma temperatures with the flattened profiles in the scrape-off-layer. It is shown that to maintain the balance of particle fluxes at the core interface the deuterium gas puffing rate should increase as the divertor recycling coefficient decreases. The radial profiles of the heat load to the outer divertor plate, the upstream radial plasma profiles, and the effects of the cross-field plasma transport in the low-recycling regimes are discussed. It is also shown that recycling of lithium impurities evaporating from the divertor plate at high surface temperatures can reverse the low-recycling divertor operational regime to the high-recycling one and may cause thermal instability of the divertor plate.

  2. Declaration of the Government of Argentina regime for sensitive exports

    International Nuclear Information System (INIS)

    1992-05-01

    The document reproduces the Declaration of the Government of Argentina concerning the new regime for foreign sales of any materials, equipment, technology, technical assistance and services relating to nuclear or missile technology, and of chemical substances which might be used in the production and deployment of missiles and nuclear, chemical and bacteriological weapons

  3. Transport processes in magnetically confined plasmas in the nonlinear regime.

    Science.gov (United States)

    Sonnino, Giorgio

    2006-06-01

    A field theory approach to transport phenomena in magnetically confined plasmas is presented. The thermodynamic field theory (TFT), previously developed for treating the generic thermodynamic system out of equilibrium, is applied to plasmas physics. Transport phenomena are treated here as the effect of the field linking the thermodynamic forces with their conjugate flows combined with statistical mechanics. In particular, the Classical and the Pfirsch-Schluter regimes are analyzed by solving the thermodynamic field equations of the TFT in the weak-field approximation. We found that, the TFT does not correct the expressions of the ionic heat fluxes evaluated by the neoclassical theory in these two regimes. On the other hand, the fluxes of matter and electronic energy (heat flow) is further enhanced in the nonlinear Classical and Pfirsch-Schluter regimes. These results seem to be in line with the experimental observations. The complete set of the electronic and ionic transport equations in the nonlinear Banana regime, is also reported. A paper showing the comparison between our theoretic results and the experimental observations in the JET machine is currently in preparation.

  4. Nonlinear transport processes in tokamak plasmas. I. The collisional regimes

    International Nuclear Information System (INIS)

    Sonnino, Giorgio; Peeters, Philippe

    2008-01-01

    An application of the thermodynamic field theory (TFT) to transport processes in L-mode tokamak plasmas is presented. The nonlinear corrections to the linear ('Onsager') transport coefficients in the collisional regimes are derived. A quite encouraging result is the appearance of an asymmetry between the Pfirsch-Schlueter (P-S) ion and electron transport coefficients: the latter presents a nonlinear correction, which is absent for the ions, and makes the radial electron coefficients much larger than the former. Explicit calculations and comparisons between the neoclassical results and the TFT predictions for Joint European Torus (JET) plasmas are also reported. It is found that the nonlinear electron P-S transport coefficients exceed the values provided by neoclassical theory by a factor that may be of the order 10 2 . The nonlinear classical coefficients exceed the neoclassical ones by a factor that may be of order 2. For JET, the discrepancy between experimental and theoretical results for the electron losses is therefore significantly reduced by a factor 10 2 when the nonlinear contributions are duly taken into account but, there is still a factor of 10 2 to be explained. This is most likely due to turbulence. The expressions of the ion transport coefficients, determined by the neoclassical theory in these two regimes, remain unaltered. The low-collisional regimes, i.e., the plateau and the banana regimes, are analyzed in the second part of this work

  5. Dynamic two state stochastic models for ecological regime shifts

    DEFF Research Database (Denmark)

    Møller, Jan Kloppenborg; Carstensen, Niels Jacob; Madsen, Henrik

    2009-01-01

    of the model illustrates that hysteresis effect and regime shifts can be obtained for a limited range of parameter values only. The effect of multiplicative noise components entering at different levels of the model is presented and discussed. Including noise leads to very different results on the stability...

  6. Process-based humidity control regime for greenhouse crops

    NARCIS (Netherlands)

    Korner, O.; Challa, H.

    2003-01-01

    Modern greenhouses in The Netherlands are designed for efficient use of energy. Climate control traditionally aims at optimal crop performance. However, energy saving is a major issue for the development of new temperature regimes. Temperature integration (TI) results in fluctuating and often high

  7. Surge and selection: power in the refugee resettlement regime

    OpenAIRE

    Annelisa Lindsay

    2017-01-01

    There is an imbalance of power – and a resulting lack of agency for refugees – in the structure of the current resettlement regime. The top-down process of selection also poses ethical dilemmas, as recent surges in resettlement operations show.

  8. Effects of seasonal variation and tidal regimes on macrobenthic ...

    African Journals Online (AJOL)

    An assessment of the effects of seasonal variation and tidal regimes on the distribution and density of macrobenthic invertebrates of the coastal Warri River, southern Nigeria was carried out from July 2014 to February 2015. Samples were collected from five longitudinal stations from headwater to mouth during high and low ...

  9. The legal regime of corruption in Ethiopia: an assessment from ...

    African Journals Online (AJOL)

    Corruption is a universal problem which compromises people's quest for development, peace, democracy, and human rights though its degree of severity varies. Due to its universality, there was global campaign against corruption and has resulted in an international regime of law. Law is one of the strategies of combating ...

  10. Early signatures of regime shifts in gene expression dynamics

    Science.gov (United States)

    Pal, Mainak; Pal, Amit Kumar; Ghosh, Sayantari; Bose, Indrani

    2013-06-01

    Recently, a large number of studies have been carried out on the early signatures of sudden regime shifts in systems as diverse as ecosystems, financial markets, population biology and complex diseases. The signatures of regime shifts in gene expression dynamics are less systematically investigated. In this paper, we consider sudden regime shifts in the gene expression dynamics described by a fold-bifurcation model involving bistability and hysteresis. We consider two alternative models, models 1 and 2, of competence development in the bacterial population B. subtilis and determine some early signatures of the regime shifts between competence and noncompetence. We use both deterministic and stochastic formalisms for the purpose of our study. The early signatures studied include the critical slowing down as a transition point is approached, rising variance and the lag-1 autocorrelation function, skewness and a ratio of two mean first passage times. Some of the signatures could provide the experimental basis for distinguishing between bistability and excitability as the correct mechanism for the development of competence.

  11. Regular and Chaotic Regimes in Scalar Field Cosmology

    Directory of Open Access Journals (Sweden)

    Alexey V. Toporensky

    2006-03-01

    Full Text Available A transient chaos in a closed FRW cosmological model with a scalar field is studied. We describe two different chaotic regimes and show that the type of chaos in this model depends on the scalar field potential. We have found also that for sufficiently steep potentials or for potentials with large cosmological constant the chaotic behavior disappears.

  12. The perturbative Regge-calculus regime of loop quantum gravity

    International Nuclear Information System (INIS)

    Bianchi, Eugenio; Modesto, Leonardo

    2008-01-01

    The relation between loop quantum gravity and Regge calculus has been pointed out many times in the literature. In particular the large spin asymptotics of the Barrett-Crane vertex amplitude is known to be related to the Regge action. In this paper we study a semiclassical regime of loop quantum gravity and show that it admits an effective description in terms of perturbative area-Regge-calculus. The regime of interest is identified by a class of states given by superpositions of four-valent spin networks, peaked on large spins. As a probe of the dynamics in this regime, we compute explicitly two- and three-area correlation functions at the vertex amplitude level. We find that they match with the ones computed perturbatively in area-Regge-calculus with a single 4-simplex, once a specific perturbative action and measure have been chosen in the Regge-calculus path integral. Correlations of other geometric operators and the existence of this regime for other models for the dynamics are briefly discussed

  13. Defocusing regimes of nonlinear waves in media with negative dispersion

    DEFF Research Database (Denmark)

    Bergé, L.; Kuznetsov, E.A.; Juul Rasmussen, J.

    1996-01-01

    Defocusing regimes of quasimonochromatic waves governed by a nonlinear Schrodinger equation with mixed-sign dispersion are investigated. For a power-law nonlinearity, we show that localized solutions to this equation defined at the so-called critical dimension cannot collapse in finite time...

  14. Metabolic responses of Eucalyptus species to different temperature regimes

    NARCIS (Netherlands)

    Mokochinski, Joao Benhur; Mazzafera, Paulo; Sawaya, Alexandra Christine Helena Frankland; Mumm, Roland; Vos, de Ric Cornelis Hendricus; Hall, Robert David

    2018-01-01

    Species and hybrids of Eucalyptus are the world's most widely planted hardwood trees. They are cultivated across a wide range of latitudes and therefore environmental conditions. In this context, comprehensive metabolomics approaches have been used to assess how different temperature regimes may

  15. Sputtering of Ge(001): transition between dynamic scaling regimes

    DEFF Research Database (Denmark)

    Smilgies, D.-M.; Eng, P.J.; Landemark, E.

    1997-01-01

    We have studied the dynamic behavior of the Ge(001) surface during sputtering in situ and in real time using synchrotron X-ray diffraction. We find two dynamic regimes as a function of surface temperature and sputter current which are separated by a sharp transition. The boundary between these two...

  16. Root response of Jerusalem artichoke genotypes to different water regimes

    Science.gov (United States)

    The objective of this study was to determine effects of drought on selected root growth parameters and develop relationships between root parameters and tuber yield for selected Jerusalem artichoke (JA) genotypes. Three water regimes (Field capacity, 50% available water (AW) and 25% AW) and five JA...

  17. Alternative pricing regimes in Ontario : exploring the impacts

    International Nuclear Information System (INIS)

    Rowlands, I.H.

    2006-01-01

    Legislative goals were recently established in Ontario to promote reliability and quality of electricity service and to ensure that distribution rates for customers remain reasonable. This presentation explored the effect of changing electricity pricing structures on residential customers in Ontario. This study investigated a period between May to December 2005, in the town of Milton, Ontario. Monthly demand was measured for each month, and monthly weighted averages were presented. Residents with electric heating were removed from the sample. Four pricing structure scenarios were examined: (1) flat rates; (2) time-of-use pricing regimes; (3) real time pricing regimes; and (4) critical peak pricing. Average monthly consumption rates for July and August for all 4 scenarios were presented. Results for time-of-use were compared to flat rates, which showed a slight increase in monthly costs. Real time average monthly electricity costs were significantly higher. Time-of-use costs increased by 57 per cent during the periods examined. Real time pricing regimes resulted in a 196 per cent rise in costs. It was concluded that more research must be done to explore the policy implications of pricing regimes and their effect on consumer behaviour. refs., tabs., figs

  18. Nature of exponents found in the critical regime of YBCO

    International Nuclear Information System (INIS)

    Marhas, Manmeet Kaur; Saravanan, P.; Balakrishnan, K.; Srinivasan, R.; Kanjilal, D.; Metha, G.K.; Pai, S.P.; Pinto, R.; Vedvyas, M.; Ogale, S.B.; Mohan Rao, G.; Nathan, Senthil; Mohan, S.

    1997-01-01

    Full text: Fluctuation effects in electrical conductivity near T c is an important tool for studying the nature of phase transition in high T c ceramics. Probing critical regime by way of experiments demand data of good precision. Measurements were carried out on well characterised high T c films prepared by laser ablation and high pressure oxygen sputtering. High energy ion irradiation carried out to see the effect of disorder. Precise electrical resistivity measurements were carried out near T c with a temperature control accuracy better than 10 mK and large number of data points were collected in this regime. 100 MeV oxygen and 200 MeV Ag ions were used with varying fluences for irradiation at 77K. The data was analysed using existing models of critical fluctuation effects. The exponent of electrical conductivity in laser ablated thin films whose transition widths are less than 1 K was 1.33 and is independent of disorder caused by high energy ion irradiation and this could be identified as the exponent for excess conductivity in the critical intermediate charged fluctuation regime as proposed by Fisher. The exponent is around 2.7 in those films whose transition widths are greater than 1 K and also was independent of disorder and this could be identified as exponent in the para coherence regime

  19. Regime-switching models to study psychological process

    NARCIS (Netherlands)

    Hamaker, E.L.; Grasman, R.P.P.P.; Kamphuis, J.H.

    2010-01-01

    Many psychological processes are characterized by recurrent shifts between different states. To model these processes at the level of the individual, regime-switching models may prove useful. In this chapter we discuss two of these models: the threshold autoregressive model and the Markov

  20. Optimal ranking regime analysis of TreeFlow dendrohydrological reconstructions

    Science.gov (United States)

    The Optimal Ranking Regime (ORR) method was used to identify 6-100 year time windows containing significant ranking sequences in 55 western U.S. streamflow reconstructions, and reconstructions of the level of the Great Salt Lake and San Francisco Bay salinity during 1500-2007. The method’s ability t...

  1. Ranking Regime and the Future of Vernacular Scholarship

    Science.gov (United States)

    Ishikawa, Mayumi

    2014-01-01

    World university rankings and their global popularity present a number of far-reaching impacts for vernacular scholarship. This article employs a multidimensional approach to analyze the ranking regime's threat to local scholarship and knowledge construction through a study of Japanese research universities. First, local conditions that have led…

  2. Thinning regimes and initial spacing for Eucalyptus plantations in Brazil.

    Science.gov (United States)

    Ferraz Filho, Antonio C; Mola-Yudego, Blas; González-Olabarria, José R; Scolforo, José Roberto S

    2018-01-01

    This study focuses on the effects of different thinning regimes on clonal Eucalyptus plantations growth. Four different trials, planted in 1999 and located in Bahia and Espírito Santo States, were used. Aside from thinning, initial planting density, and post thinning fertilization application were also evaluated. Before canopy closure, and therefore before excessive competition between trees took place, it was found that stands planted under low densities (667 trees per hectare) presented a lower mortality proportion when compared to stand planted under higher densities (1111 trees per hectare). However, diameter growth prior to thinning operations was not statistically different between these two densities, presenting an overall mean of 4.9 cm/year. After canopy closure and the application of the thinning treatments, it was found that thinning regimes beginning early in the life of the stand and leaving a low number of residual trees presented the highest diameter and height growth. Unthinned treatments and thinning regimes late in the life of the stand (after 5.5 years), leaving a large number of residual trees presented the highest values of basal area production. The choice of the best thinning regime for Eucalyptus clonal material will vary according to the plantation objective.

  3. Consumption, investment and life insurance under different tax regimes

    DEFF Research Database (Denmark)

    Bruun, Kenneth

    2013-01-01

    We study the effects of introducing taxation in classical continuous-time optimization problems with utility from consumption, bequest and retirement savings. Inspired by actual tax favoured retirement savings programs, we formulate and solve the optimization problem for various tax regimes, and ...

  4. Quantifying flooding regime in floodplain forests to guide river restoration

    Science.gov (United States)

    Christian O. Marks; Keith H. Nislow; Francis J. Magilligan

    2014-01-01

    Determining the flooding regime needed to support distinctive floodplain forests is essential for effective river conservation under the ubiquitous human alteration of river flows characteristic of the Anthropocene Era. At over 100 sites throughout the Connecticut River basin, the largest river system in New England, we characterized species composition, valley and...

  5. Building New Competition Law Regimes: Selected Essays | CRDI ...

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

    29 mars 2013 ... Individual chapters examine the development of competition law regimes in diverse countries – Mexico, Hungary, South Africa, Thailand (with remarks on South ... David Lewis is Executive Director of Corruption Watch and Extraordinary Professor at the Gordon Institute of Business Science, South Africa.

  6. Dynamic Financial Constraints: Distinguishing Mechanism Design from Exogenously Incomplete Regimes.

    Science.gov (United States)

    Karaivanov, Alexander; Townsend, Robert M

    2014-05-01

    We formulate and solve a range of dynamic models of constrained credit/insurance that allow for moral hazard and limited commitment. We compare them to full insurance and exogenously incomplete financial regimes (autarky, saving only, borrowing and lending in a single asset). We develop computational methods based on mechanism design, linear programming, and maximum likelihood to estimate, compare, and statistically test these alternative dynamic models with financial/information constraints. Our methods can use both cross-sectional and panel data and allow for measurement error and unobserved heterogeneity. We estimate the models using data on Thai households running small businesses from two separate samples. We find that in the rural sample, the exogenously incomplete saving only and borrowing regimes provide the best fit using data on consumption, business assets, investment, and income. Family and other networks help consumption smoothing there, as in a moral hazard constrained regime. In contrast, in urban areas, we find mechanism design financial/information regimes that are decidedly less constrained, with the moral hazard model fitting best combined business and consumption data. We perform numerous robustness checks in both the Thai data and in Monte Carlo simulations and compare our maximum likelihood criterion with results from other metrics and data not used in the estimation. A prototypical counterfactual policy evaluation exercise using the estimation results is also featured.

  7. The State of Competition and the Competition Regime of Ethiopia ...

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

    The socialist regime's economic policies are further compounding the problems that businesses face. ... This project seeks to investigate the barriers to competition, the potential gaps in Ethiopia's revised competition law (Trade Practices Proclamation), and the possible challenges that ... Bulletin de BRAS - Janvier 2018.

  8. Predicting weather regime transitions in Northern Hemisphere datasets

    Energy Technology Data Exchange (ETDEWEB)

    Kondrashov, D. [University of California, Department of Atmospheric and Oceanic Sciences and Institute of Geophysics and Planetary Physics, Los Angeles, CA (United States); Shen, J. [UCLA, Department of Statistics, Los Angeles, CA (United States); Berk, R. [UCLA, Department of Statistics, Los Angeles, CA (United States); University of Pennsylvania, Department of Criminology, Philadelphia, PA (United States); D' Andrea, F.; Ghil, M. [Ecole Normale Superieure, Departement Terre-Atmosphere-Ocean and Laboratoire de Meteorologie Dynamique (CNRS and IPSL), Paris Cedex 05 (France)

    2007-10-15

    A statistical learning method called random forests is applied to the prediction of transitions between weather regimes of wintertime Northern Hemisphere (NH) atmospheric low-frequency variability. A dataset composed of 55 winters of NH 700-mb geopotential height anomalies is used in the present study. A mixture model finds that the three Gaussian components that were statistically significant in earlier work are robust; they are the Pacific-North American (PNA) regime, its approximate reverse (the reverse PNA, or RNA), and the blocked phase of the North Atlantic Oscillation (BNAO). The most significant and robust transitions in the Markov chain generated by these regimes are PNA {yields} BNAO, PNA {yields} RNA and BNAO {yields} PNA. The break of a regime and subsequent onset of another one is forecast for these three transitions. Taking the relative costs of false positives and false negatives into account, the random-forests method shows useful forecasting skill. The calculations are carried out in the phase space spanned by a few leading empirical orthogonal functions of dataset variability. Plots of estimated response functions to a given predictor confirm the crucial influence of the exit angle on a preferred transition path. This result points to the dynamic origin of the transitions. (orig.)

  9. Body size distributions signal a regime shift in a lake ...

    Science.gov (United States)

    Communities of organisms, from mammals to microorganisms, have discontinuous distributions of body size. This pattern of size structuring is a conservative trait of community organization and is a product of processes that occur at multiple spatial and temporal scales. In this study, we assessed whether body size patterns serve as an indicator of a threshold between alternative regimes. Over the past 7000 years, the biological communities of Foy Lake (Montana,USA) have undergone a major regime shift owing to climate change. We used a palaeoecological record of diatom communities to estimate diatom sizes, and then analysed the discontinuous distribution of organism sizes over time. We used Bayesian classification and regression tree models to determine that all time intervals exhibited aggregations of sizes separated by gaps in the distribution and found a significant change in diatom body size distributions approximately 150 years before the identified ecosystem regime shift. We suggest that discontinuity analysis is a useful addition to the suite of tools for the detection of early warning signals of regime shifts. Communities of organisms from mammals to microorganisms have discontinuous distributions of body size. This pattern of size structuring is a conservative trait of community organization and is a product of processes that occur at discrete spatial and temporal scales within ecosystems. Here, a paleoecological record of diatom community change is use

  10. Patrimonialism and Military Regimes in Africa | Ikpe | African Journal ...

    African Journals Online (AJOL)

    ... and pernicious effect on democracy because of unconcealed ethnic/sectional alignment of regimes. This generates inter-ethnic acrimony and rivalry, in effect, delegitimizes the state and state power, and consequently, engenders an uncongenial environment for cultivating democracy. (A. J. of Political Science: 2001 5(1): ...

  11. Syria: The Consolidation of the Asad Regime, 1970-1975.

    Science.gov (United States)

    Olson, Robert W.

    1982-01-01

    Up to 1975-76, Syria's Hafiz al-Asad was successful in consolidating his power, securing the maintenance of his regime, and broadening his base of political power. His system started weakening in 1975 due to increased opposition stemming from Syria's intervention in the Lebanese civil war. (AM)

  12. On the Dynamic Nature of Performance Management Regimes

    DEFF Research Database (Denmark)

    Kristiansen, Mads Bøge; Dahler-Larsen, Peter; Ghin, Eva Moll

    2018-01-01

    The ambition of this article is to gain a better understanding of the endogenous dynamics of performance management regimes. Based on a review of the literature, we develop a framework that enables us to grasp dimensions and mechanisms of escalation. Hereafter, we demonstrate the use of our frame...

  13. Political regime and human capital: A cross-country analysis

    NARCIS (Netherlands)

    Klomp, J.G.; Haan, de J.

    2013-01-01

    We examine the relationship between different dimensions of the political regime in place and human capital using a two-step structural equation model. In the first step, we employ factor analysis on 16 human capital indicators to construct two new human capital measures (basic and advanced human

  14. Political regime and human capital : A cross-country analysis

    NARCIS (Netherlands)

    Klomp, J.G.; de Haan, J.

    We examine the relationship between different dimensions of the political regime in place and human capital using a two-step structural equation model. In the first step, we employ factor analysis on 16 human capital indicators to construct two new human capital measures (basic and advanced human

  15. Changing Forest Disturbance Regimes and Risk Perceptions in Homer, Alaska

    Science.gov (United States)

    Courtney G. F1int

    2007-01-01

    Forest disturbances caused by insects can lead to other disturbances, risks, and changes across landscapes. Evaluating the human dimensions of such disturbances furthers understanding of integrated changes in natural and social systems. This article examines the effects of changing forest disturbance regimes on local risk perceptions and attitudes in Homer, Alaska....

  16. Delay-Limited Capacity in the Low Power Regime

    KAUST Repository

    Rezki, Zouheir; Alouini, Mohamed-Slim

    2016-01-01

    provide a simple characterization of the outage probability in the regime of interest. We quantify the reward due to CSI-TR over the constant-rate constant-power scheme and show that this reward increases with the delay constraint. For instance

  17. Oil and gas fiscal regimes of the western Canadian provinces

    International Nuclear Information System (INIS)

    1991-11-01

    This report compares the fiscal regimes in British Columbia, Alberta, Saskatchewan and Manitoba. During 1985-1988, federal and provincial governments have made numerous fiscal changes, many in response to the drop in world oil prices. The new fiscal policies generally have reflected governments' willingness to forego revenues in an effort to aid the oil and gas industry, with certain exemptions. Since 1988, changes have reflected trends of consolidation and less government willingness to forego revenues. A federal large corporations capital tax has been introduced, the natural gas exploration holiday in Alberta expired, new oil royalties were introduced, and changes were made in fiscal regimes to accomodate horizontal drilling in Saskatchewan and Manitoba. In this document, the existing corporate tax regime is described. A comparison of fiscal regimes must recognize the differing scale and nature of oil and gas operations among the 4 provinces, with Alberta accounting for 80-90% of Canada's oil and gas productions, while British Columbia, Saskatchewan and Manitoba are much smaller producers. The document describes Crown royalties and incentives and freehold taxes for each type of fuel (crude oil, natural gas, natural gas byproducts, nonconventional oil). 8 figs

  18. Influence of vegetation cover on thermal regime of mountainous catchments

    Czech Academy of Sciences Publication Activity Database

    Tesař, Miroslav; Šír, Miloslav; Lichner, Ľ.; Zelenková, E.

    2006-01-01

    Roč. 61, Suppl. 19 (2006), S311-S314 ISSN 1335-6372 R&D Projects: GA ČR GA205/05/2312 Institutional research plan: CEZ:AV0Z20600510 Keywords : climate * plant transpiration * thermal regime Subject RIV: DA - Hydrology ; Limnology

  19. Economic regimes for fission--fusion energy systems

    International Nuclear Information System (INIS)

    Deonigi, D.E.

    1974-01-01

    The objectives of this hybrid fusion-fission economic regimes study are to: (1) define the target costs to be met, (2) define the optimum fissile/electrical production ratio for hybrid blankets, (3) discover synergistic configurations, and (4) define the windows of economic hybrid design having desirable cost/benefit ratios. (U.S.)

  20. Political Regime and Human Capital: A Cross-Country Analysis

    Science.gov (United States)

    Klomp, Jeroen; de Haan, Jakob

    2013-01-01

    We examine the relationship between different dimensions of the political regime in place and human capital using a two-step structural equation model. In the first step, we employ factor analysis on 16 human capital indicators to construct two new human capital measures (basic and advanced human capital). In the second step, we estimate the…

  1. Exchange rate volatility and regime change: Visegrad comparison

    Czech Academy of Sciences Publication Activity Database

    Kočenda, Evžen; Valachy, J.

    -, č. 7 (2006), s. 1-36 R&D Projects: GA ČR GA402/06/1293 Institutional research plan: CEZ:AV0Z70850503 Keywords : exchange rate regime s * volatility * transition Subject RIV: AH - Economics http://deepblue.lib.umich.edu/bitstream/2027.42/21616/1/IPC-working-paper-007-KocendaValachy.pdf

  2. Exchange rate volatility and regime change: a Visegrad comparison

    Czech Academy of Sciences Publication Activity Database

    Kočenda, Evžen; Valachy, J.

    2006-01-01

    Roč. 34, č. 4 (2006), s. 727-753 ISSN 0147-5967 Institutional research plan: CEZ:MSM0021620846 Keywords : exchange rate s * exchange rate regime s * volatility Subject RIV: EH - Ecology, Behaviour Impact factor: 0.964, year: 2006 http://dx.doi.org/10.1016/j.jce.2006.07.003

  3. Announced regime switch: optimal policy for transition period

    Czech Academy of Sciences Publication Activity Database

    Brázdik, František

    -, č. 402 (2009), s. 1-49 ISSN 1211-3298 Institutional research plan: CEZ:MSM0021620846 Keywords : new Keynesian models * small open economy * monetary regime Subject RIV: AH - Economics http://www.cerge-ei.cz/pdf/wp/Wp402.pdf

  4. Analysis of the Two-Regime Method on Square Meshes

    KAUST Repository

    Flegg, Mark B.

    2014-01-01

    The two-regime method (TRM) has been recently developed for optimizing stochastic reaction-diffusion simulations [M. Flegg, J. Chapman, and R. Erban, J. Roy. Soc. Interface, 9 (2012), pp. 859-868]. It is a multiscale (hybrid) algorithm which uses stochastic reaction-diffusion models with different levels of detail in different parts of the computational domain. The coupling condition on the interface between different modeling regimes of the TRM was previously derived for onedimensional models. In this paper, the TRM is generalized to higher dimensional reaction-diffusion systems. Coupling Brownian dynamics models with compartment-based models on regular (square) two-dimensional lattices is studied in detail. In this case, the interface between different modeling regimes contains either flat parts or right-angle corners. Both cases are studied in the paper. For flat interfaces, it is shown that the one-dimensional theory can be used along the line perpendicular to the TRM interface. In the direction tangential to the interface, two choices of the TRM parameters are presented. Their applicability depends on the compartment size and the time step used in the molecular-based regime. The two-dimensional generalization of the TRM is also discussed in the case of corners. © 2014 Society for Industrial and Applied Mathematics.

  5. Early signatures of regime shifts in gene expression dynamics

    International Nuclear Information System (INIS)

    Pal, Mainak; Pal, Amit Kumar; Ghosh, Sayantari; Bose, Indrani

    2013-01-01

    Recently, a large number of studies have been carried out on the early signatures of sudden regime shifts in systems as diverse as ecosystems, financial markets, population biology and complex diseases. The signatures of regime shifts in gene expression dynamics are less systematically investigated. In this paper, we consider sudden regime shifts in the gene expression dynamics described by a fold-bifurcation model involving bistability and hysteresis. We consider two alternative models, models 1 and 2, of competence development in the bacterial population B. subtilis and determine some early signatures of the regime shifts between competence and noncompetence. We use both deterministic and stochastic formalisms for the purpose of our study. The early signatures studied include the critical slowing down as a transition point is approached, rising variance and the lag-1 autocorrelation function, skewness and a ratio of two mean first passage times. Some of the signatures could provide the experimental basis for distinguishing between bistability and excitability as the correct mechanism for the development of competence. (paper)

  6. Temperature structure function in the Bolgiano regime of thermal convection

    Czech Academy of Sciences Publication Activity Database

    Skrbek, Ladislav; Niemela, J. J.; Sreenivasan, K. R.; Donnelly, J.

    2002-01-01

    Roč. 66, č. 3 (2002), 036303/1-036303/6 ISSN 1063-651X Institutional research plan: CEZ:AV0Z1010914 Keywords : thermal convection * temperature fluctuations * Bolgiano regime Subject RIV: BK - Fluid Dynamics Impact factor: 2.397, year: 2002

  7. Eurasian polities as hybrid regimes: The case of Putin's Russia

    Directory of Open Access Journals (Sweden)

    Henry E. Hale

    2010-01-01

    Full Text Available Most Eurasian countries' political systems are not accurately described as some version of either democracy or authoritarianism. Nor does it advance social science to study each of these countries' political systems as being completely unique, sharing no significant commonalities with those of other countries. Instead, it is more fruitful to understand many Eurasian countries as a type of hybrid regime, a system that combines important elements of both democracy and autocracy in some way. One of the most important features of Eurasia's hybrid regimes, one that is shared by many hybrid regimes worldwide, is that they combine contested elections with pervasive political clientelism. Political developments in these countries can thus be usefully understood as machine politics, and the development of political systems can be understood as processes of rearranging the components of the machines in different ways. The usefulness of this approach is demonstrated through an in-depth study of the Russian Federation. It is argued that Russian political development under Putin is best understood not as “authoritarianization” but as a process in which Russia transitioned from a system of “competing pyramids” of machine power to a “single-pyramid” system, a system dominated by one large political machine. It turns out that in single-pyramid systems that preserve contested elections, as does Russia, public opinion matters more than in typical authoritarian regimes.

  8. Phase-locking regimes of photonic crystal nanocavity laser arrays

    DEFF Research Database (Denmark)

    Skovgård, Troels Suhr; Kristensen, Philip Trøst; Mørk, Jesper

    2011-01-01

    -difference time-domain calculations, the typical coupling strength is extracted for realistic structures. Phase-locking regimes are identified, and their stability with respect to parameter variation is investigated. The results suggest that quantum well devices are not well suited for phase-locked nanocavity...

  9. Analysis of the Two-Regime Method on Square Meshes

    KAUST Repository

    Flegg, Mark B.; Chapman, S. Jonathan; Zheng, Likun; Erban, Radek

    2014-01-01

    The two-regime method (TRM) has been recently developed for optimizing stochastic reaction-diffusion simulations [M. Flegg, J. Chapman, and R. Erban, J. Roy. Soc. Interface, 9 (2012), pp. 859-868]. It is a multiscale (hybrid) algorithm which uses

  10. Crack growth prediction for low-cycle fatigue regime

    International Nuclear Information System (INIS)

    Kamaya, Masayuki

    2017-01-01

    The objective of this study is to show a crack growth prediction procedure for the low-cycle fatigue regime. First, fatigue crack growth tests using Type 316 stainless steel specimens at room temperature were reviewed. It was seen that the crack growth rates correlated well with the equivalent stress intensify factor, which was derived using strain range instead of stress range. Furthermore, the effective equivalent stress intensify factor derived using the effective strain range exhibited excellent correlation with the crack growth rates obtained under various specimen geometries and loading conditions including high and low-cycle regimens. The obtained crack growth rates were also compared with the growth rate prescribed in the fitness-for-service code of the Japan Society of Mechanical Engineers (JSME). The test results agreed with the growth rate of JSME code. Finally, the procedure for predicting the low-cycle fatigue crack growth was shown. Although the JSME code is aimed at predicting fatigue crack growth for the so-called small scale yielding condition (high-cycle fatigue regime), the material constants determined for the high-cycle fatigue regime can be used even for the low-cycle fatigue regime. (author)

  11. Monitoring, Accounting and Enforcement in Emissions Trading Regimes

    International Nuclear Information System (INIS)

    Peterson, S.

    2003-01-01

    Monitoring, accounting and enforcement have been addressed in quite a number of presentations, papers and discussions in the past four CATEP workshops. Besides drawing conclusions from the experiences with existing trading regimes, different aspects of compliance have been analysed in more detail and finally there has been a special focus on standardised accounting systems. This paper tries to summarise the diverse findings to get a comprehensive picture of what is needed to assure high compliance in emissions trading regimes and identify any specific problems. The first section focuses on real trading regimes that are all local or at most national. It describes the monitoring, accounting and enforcement systems in existing and planned trading regimes to get an idea of what such systems include and to draw conclusions from experience. One focus is on enforcement mechanisms, as different from monitoring and accounting, which are basically a question of regulation and technology, penalties and compliance are a question of choices by participants and can be analysed with analytic tools. Section 3 deals with specific monitoring, accounting and enforcement problems in international emissions trading. It describes the development of internationally standardised systems and discusses the commitment period reserve as one instrument to avoid overselling of permits in international emission trading under the Kyoto Protocol. Section 5 provides a summary and conclusion

  12. Is the Economic Crisis Challenging the Prevailing Gender Regime?

    DEFF Research Database (Denmark)

    Leschke, Janine; Jepsen, Maria

    2014-01-01

    and analysing the corresponding position of women and men in paid and unpaid work, the paper contains an in-depth discussion of the short- and medium-term policy responses to the crisis. Our analysis shows that independent of the prevailing gender regime, scant public attention has been directed to gender...

  13. Climate change and future fire regimes: Examples from California

    Science.gov (United States)

    Keeley, Jon E.; Syphard, Alexandra D.

    2016-01-01

    Climate and weather have long been noted as playing key roles in wildfire activity, and global warming is expected to exacerbate fire impacts on natural and urban ecosystems. Predicting future fire regimes requires an understanding of how temperature and precipitation interact to control fire activity. Inevitably this requires historical analyses that relate annual burning to climate variation. Fuel structure plays a critical role in determining which climatic parameters are most influential on fire activity, and here, by focusing on the diversity of ecosystems in California, we illustrate some principles that need to be recognized in predicting future fire regimes. Spatial scale of analysis is important in that large heterogeneous landscapes may not fully capture accurate relationships between climate and fires. Within climatically homogeneous subregions, montane forested landscapes show strong relationships between annual fluctuations in temperature and precipitation with area burned; however, this is strongly seasonal dependent; e.g., winter temperatures have very little or no effect but spring and summer temperatures are critical. Climate models that predict future seasonal temperature changes are needed to improve fire regime projections. Climate does not appear to be a major determinant of fire activity on all landscapes. Lower elevations and lower latitudes show little or no increase in fire activity with hotter and drier conditions. On these landscapes climate is not usually limiting to fires but these vegetation types are ignition-limited. Moreover, because they are closely juxtaposed with human habitations, fire regimes are more strongly controlled by other direct anthropogenic impacts. Predicting future fire regimes is not rocket science; it is far more complicated than that. Climate change is not relevant to some landscapes, but where climate is relevant, the relationship will change due to direct climate effects on vegetation trajectories, as well as

  14. Climate Change and Future Fire Regimes: Examples from California

    Directory of Open Access Journals (Sweden)

    Jon E. Keeley

    2016-08-01

    Full Text Available Climate and weather have long been noted as playing key roles in wildfire activity, and global warming is expected to exacerbate fire impacts on natural and urban ecosystems. Predicting future fire regimes requires an understanding of how temperature and precipitation interact to control fire activity. Inevitably this requires historical analyses that relate annual burning to climate variation. Fuel structure plays a critical role in determining which climatic parameters are most influential on fire activity, and here, by focusing on the diversity of ecosystems in California, we illustrate some principles that need to be recognized in predicting future fire regimes. Spatial scale of analysis is important in that large heterogeneous landscapes may not fully capture accurate relationships between climate and fires. Within climatically homogeneous subregions, montane forested landscapes show strong relationships between annual fluctuations in temperature and precipitation with area burned; however, this is strongly seasonal dependent; e.g., winter temperatures have very little or no effect but spring and summer temperatures are critical. Climate models that predict future seasonal temperature changes are needed to improve fire regime projections. Climate does not appear to be a major determinant of fire activity on all landscapes. Lower elevations and lower latitudes show little or no increase in fire activity with hotter and drier conditions. On these landscapes climate is not usually limiting to fires but these vegetation types are ignition-limited. Moreover, because they are closely juxtaposed with human habitations, fire regimes are more strongly controlled by other direct anthropogenic impacts. Predicting future fire regimes is not rocket science; it is far more complicated than that. Climate change is not relevant to some landscapes, but where climate is relevant, the relationship will change due to direct climate effects on vegetation

  15. The human dimension of fire regimes on Earth.

    Science.gov (United States)

    Bowman, David M J S; Balch, Jennifer; Artaxo, Paulo; Bond, William J; Cochrane, Mark A; D'Antonio, Carla M; Defries, Ruth; Johnston, Fay H; Keeley, Jon E; Krawchuk, Meg A; Kull, Christian A; Mack, Michelle; Moritz, Max A; Pyne, Stephen; Roos, Christopher I; Scott, Andrew C; Sodhi, Navjot S; Swetnam, Thomas W; Whittaker, Robert

    2011-12-01

    Humans and their ancestors are unique in being a fire-making species, but 'natural' (i.e. independent of humans) fires have an ancient, geological history on Earth. Natural fires have influenced biological evolution and global biogeochemical cycles, making fire integral to the functioning of some biomes. Globally, debate rages about the impact on ecosystems of prehistoric human-set fires, with views ranging from catastrophic to negligible. Understanding of the diversity of human fire regimes on Earth in the past, present and future remains rudimentary. It remains uncertain how humans have caused a departure from 'natural' background levels that vary with climate change. Available evidence shows that modern humans can increase or decrease background levels of natural fire activity by clearing forests, promoting grazing, dispersing plants, altering ignition patterns and actively suppressing fires, thereby causing substantial ecosystem changes and loss of biodiversity. Some of these contemporary fire regimes cause substantial economic disruptions owing to the destruction of infrastructure, degradation of ecosystem services, loss of life, and smoke-related health effects. These episodic disasters help frame negative public attitudes towards landscape fires, despite the need for burning to sustain some ecosystems. Greenhouse gas-induced warming and changes in the hydrological cycle may increase the occurrence of large, severe fires, with potentially significant feedbacks to the Earth system. Improved understanding of human fire regimes demands: (1) better data on past and current human influences on fire regimes to enable global comparative analyses, (2) a greater understanding of different cultural traditions of landscape burning and their positive and negative social, economic and ecological effects, and (3) more realistic representations of anthropogenic fire in global vegetation and climate change models. We provide an historical framework to promote understanding

  16. Dynamics of levitated nanospheres: towards the strong coupling regime

    International Nuclear Information System (INIS)

    Monteiro, T S; Millen, J; Pender, G A T; Barker, P F; Marquardt, Florian; Chang, D

    2013-01-01

    The use of levitated nanospheres represents a new paradigm for the optomechanical cooling of a small mechanical oscillator, with the prospect of realizing quantum oscillators with unprecedentedly high quality factors. We investigate the dynamics of this system, especially in the so-called self-trapping regime, where one or more optical fields simultaneously trap and cool the mechanical oscillator. The determining characteristic of this regime is that both the mechanical frequency ω M and single-photon optomechanical coupling strength parameters g are a function of the optical field intensities, in contrast to usual set-ups where ω M and g are constant for the given system. We also measure the characteristic transverse and axial trapping frequencies of different sized silica nanospheres in a simple optical standing wave potential, for spheres of radii r = 20–500 nm, illustrating a protocol for loading single nanospheres into a standing wave optical trap that would be formed by an optical cavity. We use these data to confirm the dependence of the effective optomechanical coupling strength on sphere radius for levitated nanospheres in an optical cavity and discuss the prospects for reaching regimes of strong light–matter coupling. Theoretical semiclassical and quantum displacement noise spectra show that for larger nanospheres with r ∼> 100 nm a range of interesting and novel dynamical regimes can be accessed. These include simultaneous hybridization of the two optical modes with the mechanical modes and parameter regimes where the system is bistable. We show that here, in contrast to typical single-optical mode optomechanical systems, bistabilities are independent of intracavity intensity and can occur for very weak laser driving amplitudes. (paper)

  17. The human dimension of fire regimes on Earth

    Science.gov (United States)

    Bowman, David M.J.S.; Balch, Jennifer; Artaxo, Paulo; Bond, William J.; Cochrane, Mark A.; D'Antonio, Carla M.; DeFries, Ruth; Johnston, Fay H.; Keeley, Jon E.; Krawchuk, Meg A.; Kull, Christian A.; Michelle, Mack; Moritz, Max A.; Pyne, Stephen; Roos, Christopher I.; Scott, Andrew C.; Sodhi, Navjot S.; Swetnam, Thomas W.

    2011-01-01

    Humans and their ancestors are unique in being a fire-making species, but 'natural' (i.e. independent of humans) fires have an ancient, geological history on Earth. Natural fires have influenced biological evolution and global biogeochemical cycles, making fire integral to the functioning of some biomes. Globally, debate rages about the impact on ecosystems of prehistoric human-set fires, with views ranging from catastrophic to negligible. Understanding of the diversity of human fire regimes on Earth in the past, present and future remains rudimentary. It remains uncertain how humans have caused a departure from 'natural' background levels that vary with climate change. Available evidence shows that modern humans can increase or decrease background levels of natural fire activity by clearing forests, promoting grazing, dispersing plants, altering ignition patterns and actively suppressing fires, thereby causing substantial ecosystem changes and loss of biodiversity. Some of these contemporary fire regimes cause substantial economic disruptions owing to the destruction of infrastructure, degradation of ecosystem services, loss of life, and smoke-related health effects. These episodic disasters help frame negative public attitudes towards landscape fires, despite the need for burning to sustain some ecosystems. Greenhouse gas-induced warming and changes in the hydrological cycle may increase the occurrence of large, severe fires, with potentially significant feedbacks to the Earth system. Improved understanding of human fire regimes demands: (1) better data on past and current human influences on fire regimes to enable global comparative analyses, (2) a greater understanding of different cultural traditions of landscape burning and their positive and negative social, economic and ecological effects, and (3) more realistic representations of anthropogenic fire in global vegetation and climate change models. We provide an historical framework to promote understanding

  18. Fire regime characterization in Mediterranean ecosystems of Southern Italy

    Science.gov (United States)

    Lanorte, A.; Lasaponara, R.

    2009-04-01

    This paper addresses the wildfire regime in Mediterranean ecosystems of Southern Italy. Fire regimes refer to average fire conditions (including fire size, fire density, fire frequency, fire seasonality, fire intensity, fire severity, fire thresholds, etc.) occurring over a long period of time. Information on spatial pattern of forest fire locations is a key point in the study of the dynamics of fire disturbance, and allows us to improve the knowledge of past and current role of fire. Historical evidence clearly shows what did happen and this can fruitfully help to understand what is happening and what could happen in the next future. Mapping fire regimes is very challenging, because fire ocurrence features are the expression of the interactions between climate, fire, vegetation, topography, social factors. The main objective of this work is to provide a comprehensive characterization of the fire regime in Italy based on a recently updated national wildfire database. Fire data were obtained from the Italian National Forestry Service. This national database is comprised of information contained in individual fire reports completed for every fire that occurs on public lands in the Italian peninsula. Complete data were only available for 1996-2006 at the time we accessed the database, which determined the years we analysed. The primary fire history variables that we reported were number of fires, area burned, burning time and duration, and fire size (average size of individual fires) The wildfire records (wildfire area, location, time, vegetation) were analysed with other environmental (fuel availability and type), topographic features, and meteorological/climatological data. Results of our analysis could help better understand the different factors on the wildfire regime in Mediterranean ecosystems of Southern Italy.

  19. Exchange Rate Regimes – A periodical overview and a critical analysis of exchange rate regimes in Kosovo

    Directory of Open Access Journals (Sweden)

    Flamur Bunjaku

    2015-03-01

    Full Text Available Exchange rate regimes and the monetary policy are the key instruments governments use to achieve their economic and financial objectives. Moreover, due to global financial crisis the latter instruments get more importance. Empirical evidences show that exchange rate regimes in Kosovo and its monetary policy throughout their development were mainly influenced by different political and historical developments. In regard of Euroisation of monetary system in Kosovo it was found that this action generated macro - financial stability in terms of inflation and price fluctuation. However, in terms of microeconomic aspects, the unilateral adaptation of Euro as the official currency of Kosovo failed to provide microeconomic advantages such as to export stimulation, and so forth. The main exchange rate regime systems were discussed focusing in their advantages and disadvantages, and it was concluded that there is no commonly accepted theory regarding the optimality of exchange rate regimes. In addition, the global financial crisis impact in the financial system of Kosovo is also discussed and it was found that negative impacts of global financial crisis were moderate and indirect.

  20. Dimensionado mediante simulación de sistemas de energía solar fotovoltaica aplicados a la electrificación rural

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    Ciaddy Gina Rodríguez ‐ Borges

    2011-01-01

    Full Text Available El presente trabajo se basa en el método de dimensionamiento mediante simulación delcomportamiento energético de los sistemas fotovoltaicos, aplicados a la electrificación rural enregiones alejadas de la red eléctrica.Se establece la denominación de sistemas Sobre e Infradimensionados y se expone la solicitudrecibida para el análisis de un caso particular, donde se consideran dos opciones energéticas dediferentes niveles de calidades de servicio eléctrico y se solicita la valoración económica de cadaopción, con su correspondiente argumentación.El nivel de calidad se establece con el índice del % de fallos en el servicio de electricidad por falta deenergía en las baterías, además de la cantidad de los días de autonomía energética del sistema.Se concluye que para sistemas infradimensionados, y con un determinado nivel de calidad deservicio establecida, existen múltiples soluciones de dimensionado, y en determinadas condiciones,no siempre los sistemas de mayor nivel de calidad, son los de mayor costo, siendo posibledeterminar el mínimo costo en el dimensionado mediante el método de simulación.Palabras claves: sistemas fotovoltaicos autónomos, electrificación rural, calidad de sistemasenergéticos.___________________________________________________________________AbstractThe present work is based on the sizing method by means of simulation of the photovoltaic systemsenergy behavior, applied to rural electrification in regions far from the electric net.The denomination of infra/over sized systems is made and a requested analysis of one particularcase is exposed, where it is considered two energy options of different qualities of electric service andthe economic valuation of each option is requested, with its corresponding argument.The quality level is established with the fault index in the electricity service for energy lack in thebatteries, besides the quantity of energy autonomy days of the system.As conclusions, in infra

  1. Seletividade de herbicidas aplicados em pré-emergência em gramíneas forrageiras Selectivity of pre-emergence herbicides applied on forage grasses

    Directory of Open Access Journals (Sweden)

    A.C.P Rodrigues-Costa

    2011-09-01

    Full Text Available O presente trabalho teve o objetivo de avaliar a seletividade de herbicidas aplicados em pré-emergência sobre a produção e a qualidade de sementes de Brachiaria brizantha cv. Marandu e Brachiaria decumbens cv. Basilisk. Os herbicidas avaliados foram: diuron (800 e 1.600 g ha-1, ametryn (625 e 1.250 g ha-1, imazaquin (75 e 150 g ha-1, imazethapyr (50 e 100 g ha-1 e flumetsulam (70 e 140 g ha-1, além de uma testemunha sem aplicação de herbicidas. As espécies foram avaliadas separadamente no campo. Os experimentos foram instalados no delineamento em blocos casualizados com quatro repetições. Os herbicidas ametryn (625 g ha-1, imazaquin (75 e 150 g ha-1, imazethapyr (50 e 100 g ha-1 e flumetsulam (70 e 140 g ha-1 foram os que proporcionaram maior seletividade às plantas de B. brizantha, enquanto para B. decumbens o diuron (800 e 1.600 g ha-1, o ametryn (625 e 1.250 g ha-1 e o imazethapyr (50 e 100 g ha-1 foram mais seletivos, destacando-se o diuron na menor dose. Contudo, os herbicidas avaliados não alteram a produção e a qualidade das sementes das forrageiras estudadas.This study aimed to evaluate the selectivity of pre-emergence herbicides on yield and seed quality of Brachiaria brizantha cv. Brizantha and Brachiaria decumbens cv. Basilisk. The herbicides evaluated were: diuron (800 and 1.600 g ha-1, ametryn (625 and 1.250 g ha-1, imazaquin (75 and 150 g ha-1, imazethapyr (50 and 100 g ha-1 and flumetsulam (70 and 140 g ha-1, plus a control without herbicide application. The species were evaluated separately in the field. The experiments were arranged in a randomized block design with four replications. The herbicides ametryn (625 g ha-1, imazaquin (75 and 150 g ha-1, imazethapyr (50 and 100 g ha-1, and flumetsulam (70 and 140 g ha-1 provided the highest selectivity to B. brizantha plants, while for B. decumbens, diuron (800 and 1.600 g ha-1, ametryn (625 and 1.250 g ha-1, and imazethapyr (50 and 100 g ha-1 were more selective

  2. Control Tolerante a Fallas Activo: Estimación y acomodación de fallas en sensores aplicado al modelo LPV de una bicicleta sin conductor

    Directory of Open Access Journals (Sweden)

    J.A. Brizuela-Mendoza

    2016-04-01

    Full Text Available Resumen: Se presenta el diseño de un control tolerante a fallas (CTF activo aplicado al modelo de una bicicleta sin conductor con representación Lineal de Parámetros Variables en el tiempo (LPV polinomial, afectado por fallas aditivas en los sensores y ruido de medición. Dentro del CTF, el sistema de diagnóstico de fallas opera en base a las estimaciones de un observador de fallas, el cual genera el aislamiento de dichas fallas. Los algoritmos propuestos, considerados como las principales aportaciones del trabajo, logran estimaciones de fallas y variables de estado libres de ruido, con el objetivo de generar indicadores de falla y ley de control, respectivamente. La tolerancia a fallas del sistema se consigue a través de un conjunto de observadores. Los resultados se presentan en simulación de on utilizando el modelo LPV de una bicicleta sin conductor, considerando un controlador para la estabilización de la postura vertical a lo largo de su movimiento traslacional y su velocidad como parámetro variable. Abstract: This paper presents an Active Fault Tolerant Control design applied to a riderless bicycle LPV model affected by additive sensor fault and measurement noise. Within the Active Fault Tolerant Control, the detection and diagnostic system is based on the estimations computed by a fault observer, used to determine a fault occurrence. The proposed algorithms, considered as the main contributions in this work, achieves noise-free estimations for the faults and state, in order to compute the fault indicator and control law, respectively. The fault tolerance of the system is guaranteed through the fault accommodation based on a set of observers. The results have been corroborated using a riderless bicycle LPV model, with a controller that aims at keeping it stood-up along its translation motion. Palabras clave: Diagnóstico de fallas, control tolerante a fallas, observadores, sistemas LPV., Keywords: Fault diagnosis, Fault Tolerant

  3. Seletividade de herbicidas aplicados em pós-emergência sobre capim-braquiária Selectivity of post-emergence herbicides applied on signalgrass and palisadegrass

    Directory of Open Access Journals (Sweden)

    Dagoberto Martins

    2007-12-01

    Full Text Available O estudo foi conduzido com o objetivo de avaliar a seletividade de alguns herbicidas inibidores de ALS e FS II aplicados em pós-emergência em plantas de Brachiaria brizantha cv. Marandu e Brachiaria decumbens cv. Basilisk em condições de campo e seu efeito na qualidade das sementes. Os herbicidas testados (em g/ha foram: imazethapyr a 100; chlorimuronethyl a 15; nicosulfuron a 50; bentazon a 720; e atrazine a 3.000, além de uma testemunha, sem aplicação de herbicidas. Dois experimentos em campo foram instalados em delineamento em blocos casualizados com quatro repetições e os ensaios de laboratório em delineamento inteiramente casualizado, com 16 repetições. Todos os herbicidas testados tiveram algum efeito de fitointoxicação visual aos cultivares avaliados. O nicosulfuron foi o herbicida que visualmente proporcionou os níveis mais elevados de injúrias às plantas de B. decumbens e B. brizantha. A produção de MS de B. brizantha nos estádios iniciais de crescimento foi reduzida pelos herbicidas nicosulfuron e atrazine, enquanto, em B. decumbens, apenas o herbicida nicosulfuron ocasionou redução da produção de MS. A qualidade das sementes de ambos os cultivares foi afetada pelo nicosulfuron, que induziu a dormência em sementes de B. decumbens, reduziu a porcentagem de sementes normais e, assim como o atrazine, aumentou a porcentagem de sementes mortas.This work evaluated the herbicides selectivity acetolactate synthase inhibitors and photosynthetic II applied in post- emergency in palisadegrass (Brachiaria brizantha cv. Marandu and signalgrass (Brachiaria decumbens cv. Basilisk plants in field conditions and their effect in seed quality. Treatments tested in g ha-1 were: imazethapyr at 100, chlorimuron-ethyl at 15, nicosulfuron at 50, bentazon at 720, atrazine at 3.000, and control plot. Two field trials were set up on complete randomized block design with four replicates; laboratory studies were carried out in a complete

  4. Reconocimiento en-línea de acciones humanas basado en patrones de RWE aplicado en ventanas dinámicas de momentos invariantes

    Directory of Open Access Journals (Sweden)

    Dennis Romero López

    2014-04-01

    Full Text Available Resumen: En este trabajo se presenta una metodología para el reconocimiento en-línea de acciones humanas en secuencias de vídeo. Se aborda un enfoque eficiente para el uso de momentos invariantes como descriptores de imagen, aplicados en siluetas obtenidas del procesamiento de mapas de profundidad. Una comparación rápida entre ventanas de tamaño 4 (equivalente a 4 frames es realizada mediante el cómputo de la distancia de Mahalanobis, sobre una de las secuencias de momentos invariantes identificada como la menos sensible al ruido de captura y la más estable durante ausencia de movimiento. Este enfoque es usado para la detección rápida del estado de parada/movimiento, el cual permite la captura de intervalos (ventanas de crecimiento dinámico para su posterior procesamiento, rescatando de la señal contenida sus propiedades temporales y frecuenciales. Mediante la aplicación de la transformada Wavelet Haar, tres niveles de descomposición son utilizados para el cómputo de la Energía Relativa Wavelet (RWE - Relative Wavelet Energy y SSC (Slope Sign Change, obteniendo patrones 11-dimensionales. En experimentos realizados, el 97% de 4 movimientos capturados en-línea fueron reconocidos correctamente, y 10 movimientos tomados de la base de datos Muhavi-MAS fueron reconocidos con 94,2% de efectividad. Abstract: This paper presents a methodology for online human action recognition on video sequences. It addresses an efficient approach to use invariant moments as image descriptors, applied in processing silhouettes obtained from depth maps. A quick comparison between size-4 windows (equivalent to 4 frames is performed by computing the Mahalanobis distance, on one of the invariant moment sequences identified as less sensitive to noise and more stable during movement absence. This approach is used for rapid detection of the idle/motion state, which allows the capture of dynamic growth intervals (windows for further processing, rescuing from

  5. Modelagem de um reator integral aplicado na reação de reforma a vapor de metano = Modeling of integral reactor applied methane steam reforming

    Directory of Open Access Journals (Sweden)

    Giane Gonçalves

    2007-07-01

    Full Text Available Freqüentemente, a validação de modelos matemáticos aplicados a reatores industriais esbarra na dificuldade de obtenção de medidas experimentais confiáveis. Uma maneira de contornar esta limitação corresponde à implantação de uma unidade em escala de bancada devidamente instrumentada, na qual são obtidos dados experimentais emcondições controladas. Neste contexto, foram efetuados ensaios em um reator integral de reforma a vapor de metano em escala de bancada, em diversas condições experimentais. As medidas de temperatura no leito foram efetuadas por meio de um termopar multiponto em seis posições axiais distintas, enquanto a composição do efluente do reator foi determinada por cromatografia gasosa. Estes dados experimentais foram comparados com as previsões de um modelo pseudo-homogêneo, unidimensional e dinâmico. Os resultados indicam que o modelo é adequado, sendo que tanto a atividade catalítica como a conversão são sensíveis à temperatura operacional, enquanto a temperatura do leito é praticamente insensível à vazão nas condições experimentais exploradas.Frequently, the validation of applied mathematical models of industrial reactors dash into the difficulty of obtaining reliable experimental data. A way to overcome this limitation is the proper use and operation or a in bench scale, experimental setup from whichexperimental data can be obtained in controlled conditions. In this context, experiments were carried out in an integral reactor of steam reform, in different experimental conditions. Thermocouples were placed along the catalyst bed to allow for temperature monitoring in six equally spaced and distinct positions of the reactor, the composition of the effluent of the reactor was determined by gas chromatography. These experimental data were compared with the theoretical results of a pseudo-homogeneous one-dimensional,dynamic mathematical model. The results indicate that the model can successfully

  6. ANÁLISIS POR ELEMENTOS FINITOS APLICADOS A SEPARADORES DE CADERA COMO PREDICTOR EN EL DISEÑO DE INSTRUMENTAL QUIRÚRGICO.

    Directory of Open Access Journals (Sweden)

    MARIA CELY

    2011-01-01

    Full Text Available Las cirugía de reemplazo total de cadera (RTC ,utiliza una serie de instrumentos llamados separadores que permiten visualizar el campo quirúrgico (área acetabular [1]. El tiempo, espacio y campo quirúrgico son factores relevantes en el desarrollo de este tipo de cirugías que se ven afectados por el uso de separadores, con diseños diferentes, que requieren ser sostenidos por una o varias personas para retraer los tejidos de la pierna por tiempo prolongado, generando mayor morbilidad en el paciente y estrés en el equipo quirúrgico (equipo entendido como el grupo compuesto por el médico cirujano, anestesiólogo, instrumentador y auxiliar que desarrolla la cirugía. El instrumental actualmente utilizado, en cirugías de RTC, no satisface los requerimientos ergonómicos y minimizan las condiciones óptimas de trabajo. El uso de herramientas computacionales ha generado en las últimas décadas una solución rápida y segura a muchos problemas ingenieríles, facilitando así el desarrollo de procesos y productos. El análisis por elementos fi nitos es uno de los métodos más utilizados en problemas de tenso- deformaciones, con un componente predictivo, aplicado al diseño y desarrollo de instrumental que optimizan las condiciones de trabajo del equipo quirúrgico. El propósito de este estudio fue mejorar las condiciones de trabajo del equipo quirúrgico, minimizando las complicaciones post-quirúrgicas del paciente, a partir del estudio del instrumental quirúrgico, especialmente separadores, utilizados para cirugía RTC, incorporando criterios de diseño y analizando la distribución de tensiones generadas en el modelo, sin perder de vista los niveles de funcionalidad clínica y mecánica requeridas.

  7. Estudo dos métodos de previsão de demanda aplicado em uma empresa de auditorias médicas

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    Aline Castello Branco Mancuso

    2014-04-01

    Full Text Available A previsão de demanda é um dos principais fatores para a eficiência do gerenciamento das organizações, afetando diretamente a lucratividade do negócio. Quanto maior a acurácia da previsão de demanda melhor será o desempenho empresarial. Neste ideal, métodos de combinação de previsões e suas previsões individuais vêm sendo constantemente comparados. O objetivo principal deste trabalho é averiguar como as redes neurais artificiais (RNA e o modelo de combinação por regressão se comportam frente a uma série de dados reais (divergentes, métodos encontrados como melhores no estudo de simulação (séries estacionárias em Mancuso (2013. Aplicado aos dados de demanda dos serviços na área de auditoria médica, três técnicas de previsão foram avaliadas: RNA, Box-Jenkins (ARIMA, alisamento exponencial; e três combinações foram consideradas: média simples (aritmética, variância mínima e regressão. Os resultados demonstram a superioridade dos métodos de combinação, em termos precisão, comparados às previsões individuais.Acombinação por regressão obteve as previsões mais acuradas, mas as previsões obtidas com RNA não apresentaram o mesmo destaque. Demand forecasting is a major factor for the efficiency of the management of organizations, directly affecting business profitability. Higher accuracy of the prediction, better the business performance. In this ideal, methods of combining individual forecasts and their forecasts are being constantly compared. The main objective of this work is to investigate how artificial neural networks (ANN and regression model combination behave in the face of a series of real data (divergent, better methods found in the simulation study (stationary series in Mancuso (2013. Applied to demand data services in the area of medical audit, three forecasting techniques were evaluated: ANN, Box-Jenkins (ARIMA, exponential smoothing, and three combinations were considered: simple average

  8. Efecto del kinesiotaping con y sin tensión aplicado en cuadríceps sobre la capacidad de salto en deportistas

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    Mayerly Carolina Anaya

    2015-06-01

    Full Text Available Antecedentes: Estudios previos han encontrado que la técnica del Kinesiotaping (KT reduce la intensidad y duración del dolor y la inflamación, incrementa la fuerza muscular y estabiliza las articulaciones. Sin embargo, poco se conoce sobre su efecto para mejorar las capacidades físicas a través de la estimulación muscular en deportistas. Objetivo: Evaluar el efecto del KT aplicado en el cuadríceps sobre la capacidad de salto vertical en deportistas sanos, ajustado por el porcentaje de coordinación y elasticidad, edad e Índice de Masa Corporal. Metodología: Estudio experimental realizado en 24 voleibolistas, aleatorizados en dos grupos: (1 12 sujetos (21.3 ± 3.4 años, 75.6 ± 13.9Kg, con aplicación del KT en cuádriceps femoral con tensión; (2 12 sujetos (20.5± 2.9 años, 71.8 ± 6.8 Kg con aplicación del KT en cuádriceps femoral sin tensión. Resultados: Los datos no mostraron diferencias estadísticamente significativas en la aplicación del KT con y sin tensión; se encontró asociación estadísticamente significativa entre el porcentaje de coordinación y la altura del salto alcanzado en la prueba de Abalakov (p=0,006, cuando el KT tenía tensión y ajustado por edad e IMC. Discusión y conclusiones: La técnica KT no mejora del desempeño del salto en deportistas sanos. No se debería aplicar KT en el cuadríceps femoral con el único objetivo de mejorar el salto en jugadores de voleibol saludables masculinos.

  9. Método do limiar de variabilidade da frequência cardíaca aplicado em pré-adolescentes obesos e não obesos

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    Mário Augusto Paschoal

    2011-06-01

    Full Text Available FUNDAMENTO: A detecção do limiar anaeróbico (LA pela análise da variabilidade da frequência cardíaca (LiVFC pode significar uma nova maneira de avaliação da capacidade funcional cardiorrespiratória (CFCR em pré-adolescentes. OBJETIVO: Testar o método de LiVFC para detecção do LA em pré-adolescentes não obesos (NO, obesos (O e obesos mórbidas (OM, a fim de determinar diferenças em sua CFCR. MÉTODOS: Foram estudados 30 pré-adolescentes, com idades entre 9 e 11 anos, divididos em três grupos de 10: a grupo NO - índice de massa corpórea (IMC com percentil do National Center for Chronic Disease Prevention and Health Promotion entre 5 e 85; b grupo O - IMC de percentil entre 95 e 97 e c grupo OM - IMC com percentil acima de 97. Todos foram submetidos a um protocolo incremental realizado em esteira rolante e registraram-se os batimentos cardíacos para detecção do LiVFC, que foi determinado pelo valor de 3,0 ms do índice do desvio-padrão 1 (SD1, extraído dos intervalos RR. RESULTADOS: Os valores médios no momento do LiVFC mostraram maiores valores para o grupo NO, destacando-se: a VO2 (ml/kg/min NO = 27,4 ± 9,2; O = 13,1 ± 7,6 e OM = 11,0 ± 1,7; b FC (bpm: NO = 156,3 ± 18,0; O =141,7 ± 11,4 e OM = 137,7 ± 10,4; e c distância percorrida (metros: NO = 1.194,9 ± 427,7; O = 503,2 ± 437,5 e OM = 399,9 ± 185,1. CONCLUSÃO: O LiVFC se mostrou efetivo para avaliação da CFCR e poderá vir a ser aplicado como método alternativo à ergoespirometria em determinadas situações.

  10. Estudo dos métodos de previsão de demanda aplicado em uma empresa de auditorias médicas

    Directory of Open Access Journals (Sweden)

    Aline Castello Branco Mancuso

    2014-04-01

    Full Text Available A previsão de demanda é um dos principais fatores para a eficiência do gerenciamento das organizações, afetando diretamente a lucratividade do negócio. Quanto maior a acurácia da previsão de demanda melhor será o desempenho empresarial. Neste ideal, métodos de combinação de previsões e suas previsões individuais vêm sendo constantemente comparados. O objetivo principal deste trabalho é averiguar como as redes neurais artificiais (RNA e o modelo de combinação por regressão se comportam frente a uma série de dados reais (divergentes, métodos encontrados como melhores no estudo de simulação (séries estacionárias em Mancuso (2013. Aplicado aos dados de demanda dos serviços na área de auditoria médica, três técnicas de previsão foram avaliadas: RNA, Box-Jenkins (ARIMA, alisamento exponencial; e três combinações foram consideradas: média simples (aritmética, variância mínima e regressão. Os resultados demonstram a superioridade dos métodos de combinação, em termos precisão, comparados às previsões individuais.Acombinação por regressão obteve as previsões mais acuradas, mas as previsões obtidas com RNA não apresentaram o mesmo destaque. Demand forecasting is a major factor for the efficiency of the management of organizations, directly affecting business profitability. Higher accuracy of the prediction, better the business performance. In this ideal, methods of combining individual forecasts and their forecasts are being constantly compared. The main objective of this work is to investigate how artificial neural networks (ANN and regression model combination behave in the face of a series of real data (divergent, better methods found in the simulation study (stationary series in Mancuso (2013. Applied to demand data services in the area of medical audit, three forecasting techniques were evaluated: ANN, Box-Jenkins (ARIMA, exponential smoothing, and three combinations were considered: simple average

  11. Turbulent regimes in the tokamak scrape-off layer

    International Nuclear Information System (INIS)

    Mosetto, A.

    2014-01-01

    The tokamak scrape-off layer (SOL) is the plasma region characterized by open field lines that start and end on the vessel walls. The plasma dynamics in the SOL plays a crucial role in determining the overall performance of a tokamak, since it controls the plasma-wall interactions, being responsible of exhausting the tokamak power, it regulates the overall plasma confinement, and it governs the plasma refueling and the removal of fusion ashes. Scrape-off layer physics is intrinsically non-linear and characterized by phenomena that occur on a wide range of spatio-temporal scales. Free energy sources drive a number of unstable modes that develop into turbulence and lead to transport of particles and heat across the magnetic field lines. Depending on the driving instability, different SOL turbulent regimes can be identified. As the SOL turbulent regimes determine the plasma confinement properties and the SOL width (and, consequently, the power flux on the vessel wall, for example), it is of crucial importance to understand which turbulent regimes are active in the SOL, under which conditions they develop, and which are the main properties of the associated turbulent transport. In the present thesis we define the SOL turbulent regimes, and we provide a framework to identify them, given the operational SOL parameters. Our study is based on the drift-reduced Braginskii equations and it is focused on a limited tokamak SOL configuration. We first describe the main SOL linear instabilities, such as the inertial and resistive branches of the drift waves, the resistive, inertial and ideal branches of the ballooning modes, and the ion temperature gradient mode. Then, we find the SOL turbulent regimes depending on the instability driving turbulent transport, assuming that turbulence saturates when the radial gradient associated to the pressure fluctuations is comparable to the equilibrium one. Our methodology for the turbulent regime identification is supported by the analysis

  12. Visões de um objeto incômodo: o regime militar brasileiro An undesirable subject: the Brazilian military regime

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    Angelo Del Vecchio

    2007-05-01

    Full Text Available O presente artigo visa a qualificação do regime político vigente no Brasil entre 1964-1985. Para tanto, desenvolvo o resgate do conceito de ditadura, especialmente a partir da obra de Carl Schimitt, e busco aferir a sua adequação à análise do período militar. Palavras-chave: Estado. Regime político. Ditadura. Regime militar. The present article tries to qualify the political regime in Brazil from 1964 to 1985, using the concept of dictatorship mainly developed by Carl Schimitt in his writings and tries to adequate this concept to the Brazilian military regime. Keywords: State. Political regime. Dictatorship. Military regime.

  13. Evaluation of the virtual learning object "Diagnostic reasoning in nursing applied to preterm newborns" Evaluación del objeto virtual de aprendizaje "Raciocinio diagnóstico en enfermería aplicado al prematuro" Avaliação do objeto virtual de aprendizagem "Raciocínio diagnóstico em enfermagem aplicado ao prematuro"

    Directory of Open Access Journals (Sweden)

    Fernanda dos Santos Nogueira de Góes

    2011-08-01

    Full Text Available The potential use of computer technology in teaching and continuous education for nursing motivated the development of this study to evaluate the virtual learning object, "Diagnostic Reasoning in Nursing Applied to Preterm Newborns" at an intermediate neonatal care unit. This descriptive study evaluates the appearance and content of the virtual object concerning aspects related to presentation, organization, usability and overall impression. Experts from the fields of computer technology (12 and nursing (31 participated in the evaluation process. Each sub-item of the instrument was assessed on a Likert scale and blank space was provided for comments/suggestions. All items were positively evaluated by over 80% of the experts, except for the 'informational density' criterion in the evaluation performed by computer technology experts. The developed product is considered adequate to be used for teaching for nursing students and in continuous education of diagnostic reasoning in the development of Nursing Diagnoses for preterm newborns, in the problem-posing pedagogical framework.Vislumbrando el potencial de uso de la informática en la formación y educación permanente en enfermería, se realizó el presente estudio con el objetivo de evaluar el objeto virtual de aprendizaje "Raciocinio Diagnóstico en Enfermería Aplicado al Prematuro" en una unidad de cuidado intermedio neonatal. Se trata de un estudio descriptivo sobre la evaluación de la apariencia y contenido del objeto virtual en los aspectos relacionados a la presentación, organización, usabilidad e impresión general. Participaron peritos de las áreas de informática (12 y enfermería (31. Cada sub-ítem de los instrumentos contenía evaluación en escala tipo Likert y espacio para inclusión de comentarios/sugerencias. Todos los ítems fueron evaluados positivamente por más de 80% de los evaluadores, excepto el criterio densidad de información en la evaluación de los profesionales

  14. Procedimientos de control e inspección aplicados en la fabricación de la estructura de un puente soldado de acuerdo al código aws d1.5

    OpenAIRE

    Acosta Herrera, Hector Xavier; Serrano V, Omar

    2009-01-01

    El objetivo primordial de la presente tesis es la de presentar un método de control de calidad inspección aplicados a la fabricación de un puente y de esta manera crear una cultura de calidad en todo el proceso de fabricación, dándole mayor énfasis al control e inspección de la soldadura. Para obtener mejores resultados en el control de calidad durante la fabricación, se ha adaptado un programa de Inspección el cual incluirá los diferentes controles e inspecciones que deben realizars...

  15. Um exame dos modelos de redes de filas abertas aplicados a sistemas de manufatura discretos: parte II A survey on open queueing network models applied to discrete manufacturing systems: part II

    OpenAIRE

    Gabriel R. Bitran; Reinaldo Morabito

    1995-01-01

    Este artigo apresenta a segunda (e última) parte do nosso exame dos modelos de redes de filas abertas aplicados a sistemas de manufatura discretos. Nosso enfoque é em modelos de projeto e planejamento de job-shops. Na primeira parte (BITRAN & MORABITO, 1995b) revisamos métodos de decomposição exatos e aproximados para modelos de avaliação de desempenho em sistemas com múltiplas classes de produtos e diversas estações de trabalho. Nesta segunda parte examinamos modelos de otimização de três ca...

  16. El brocado de estaño en relieve aplicado. Evolución histórica y material en la Europa medieval con atención al arte español (siglos XV-XVI

    Directory of Open Access Journals (Sweden)

    Rodríguez López, Ainhoa

    2014-12-01

    Full Text Available The term applied tin-relief brocade (commonly called applied brocade refers to painted decoration that simulates the velvet and silk brocades made of gold and silver threads commonly used in Europe in the fifteenth and sixteenth centuries. This technique uses a mould, tin leaf, and filling mass to reproduce in a mechanical way the relief motifs of textile brocades. Once cut, they are applied to artwork, and then sometimes gilded or painted. The discovery of many examples of this type of decoration in northern Spain has led us to the study of the documentary sources, especially Spanish ones, with the purpose of improving our understanding of the technique, its historic and material development, and the typology of standardized patterns. Furthermore, this study has provided us with an important glossary of the relief painting additive techniques that culminated in applied tinrelief brocade.El término brocado de estaño en relieve aplicado (comúnmente conocido como brocado aplicado se refiere a una decoración polícroma que imita los brocados de terciopelo y seda hechos con hilos de oro y plata, los cuales dominan el mundo de la moda de Europa en los siglos XV y XVI. Esta técnica reproduce mecánicamente a través de una matriz, lámina de estaño y masa de relleno motivos en relieve de brocados textiles, que, una vez recortados, son aplicados sobre la obra, pudiendo estar en ocasiones dorados y pintados. El hallazgo de más ejemplos de esta decoración en el Norte de España nos ha conducido a analizar las fuentes documentales, especialmente las españolas, con el objetivo de ampliar nuestro conocimiento sobre la técnica en cuestión, su evolución histórica y material y sus diferentes tipologías. Asimismo, dicho estudio nos ha proporcionado un importante glosario de técnicas pictóricas en relieve por adición precursoras del brocado de estaño en relieve aplicado.

  17. Plataforma de un sistema embebido para el control y monitoreo en tiempo real aplicado a biodigestores para la óptima producción de biogás

    OpenAIRE

    Siadén Paiva, Dany Manuel Eduardo

    2017-01-01

    El objetivo de la tesis es evaluar el diseño y construcción de una plataforma de sistema embebido para el control y monitoreo en tiempo real aplicado a diferentes prototipos de biodigestores a escala piloto ubicados en las instalaciones de la Universidad de Piura. Para ello, se inicia un estudio del proceso de digestión anaerobia con el fin de determinar las variables influyentes en el proceso. Luego, se realiza un análisis de los biodigestores instalados en el país para conocer la tecnología...

  18. Tolerância de variedades de cana-de-açúcar a herbicidas aplicados em pós-emergência e efeitos residuais sobre variedades de girassol

    OpenAIRE

    Souza, Joseane Rodrigues de [UNESP

    2008-01-01

    O experimento foi conduzido no Centro de Cana do Instituto Agronômico de Campinas, localizado no município de Ribeirão Preto, SP, com o objetivo de avaliar a tolerância de variedades de cana-de-açúcar a herbicidas aplicados em pós-emergência da cultura e o efeito residual no solo sobre variedades de girassol. O primeiro estudo foi desenvolvido em campo no delineamento de blocos casualizados em esquema de parcelas subdivididas com 36 tratamentos em quatro repetições. Foram utilizadas as varied...

  19. "Estudo in vitro do potencial cariostático dos selantes resinosos, dos cimentos ionoméricos, do diamino fluoreto de prata e do verniz fluoretado, aplicados em superfície oclusal de molares permanentes humanos".

    OpenAIRE

    Thereza Christina Lopes Coutinho

    2002-01-01

    O objetivo deste trabalho foi avaliar, in vitro, ao Microscópio de Luz Polarizada (MLP), o potencial cariostático dos selantes resinosos, dos cimentos ionoméricos, do diamino fluoreto de prata e do verniz fluoretado aplicados em superfície oclusal de molares permanentes humanos. Para tanto, 70 terceiros molares humanos hígidos, extraídos por razões clínicas, foram divididos aleatoriamente em sete grupos (N=10): GI – controle (sem selamento); GII – selante resinoso sem flúor Delton ®; G III – ...

  20. Análisis de tres factores de un modelo de eficacia escolar aplicado por una organización privada en zona rural en el Perú

    OpenAIRE

    Carreras Mariani, Piera María

    2013-01-01

    La presente investigación Análisis de tres factores de un modelo de eficacia escolar aplicado por una organización privada en zona rural en el Perú tiene como propósito, analizar el rol que le asigna un programa para la mejora de la educación primaria rural a tres de los factores del modelo de eficacia escolar: el liderazgo directivo, la participación de los padres de familia y el trabajo en redes educativas. El programa objeto de análisis es desarrollado por una institución privada que...

  1. Stochastic Parametrisations and Regime Behaviour of Atmospheric Models

    Science.gov (United States)

    Arnold, Hannah; Moroz, Irene; Palmer, Tim

    2013-04-01

    The presence of regimes is a characteristic of non-linear, chaotic systems (Lorenz, 2006). In the atmosphere, regimes emerge as familiar circulation patterns such as the El-Nino Southern Oscillation (ENSO), the North Atlantic Oscillation (NAO) and Scandinavian Blocking events. In recent years there has been much interest in the problem of identifying and studying atmospheric regimes (Solomon et al, 2007). In particular, how do these regimes respond to an external forcing such as anthropogenic greenhouse gas emissions? The importance of regimes in observed trends over the past 50-100 years indicates that in order to predict anthropogenic climate change, our climate models must be able to represent accurately natural circulation regimes, their statistics and variability. It is well established that representing model uncertainty as well as initial condition uncertainty is important for reliable weather forecasts (Palmer, 2001). In particular, stochastic parametrisation schemes have been shown to improve the skill of weather forecast models (e.g. Berner et al., 2009; Frenkel et al., 2012; Palmer et al., 2009). It is possible that including stochastic physics as a representation of model uncertainty could also be beneficial in climate modelling, enabling the simulator to explore larger regions of the climate attractor including other flow regimes. An alternative representation of model uncertainty is a perturbed parameter scheme, whereby physical parameters in subgrid parametrisation schemes are perturbed about their optimal value. Perturbing parameters gives a greater control over the ensemble than multi-model or multiparametrisation ensembles, and has been used as a representation of model uncertainty in climate prediction (Stainforth et al., 2005; Rougier et al., 2009). We investigate the effect of including representations of model uncertainty on the regime behaviour of a simulator. A simple chaotic model of the atmosphere, the Lorenz '96 system, is used to study

  2. Multifractal regime transition in a modified minority game model

    International Nuclear Information System (INIS)

    Crepaldi, Antonio F.; Rodrigues Neto, Camilo; Ferreira, Fernando F.; Francisco, Gerson

    2009-01-01

    The search for more realistic modeling of financial time series reveals several stylized facts of real markets. In this work we focus on the multifractal properties found in price and index signals. Although the usual minority game (MG) models do not exhibit multifractality, we study here one of its variants that does. We show that the nonsynchronous MG models in the nonergodic phase is multifractal and in this sense, together with other stylized facts, constitute a better modeling tool. Using the structure function (SF) approach we detected the stationary and the scaling range of the time series generated by the MG model and, from the linear (non-linear) behavior of the SF we identified the fractal (multifractal) regimes. Finally, using the wavelet transform modulus maxima (WTMM) technique we obtained its multifractal spectrum width for different dynamical regimes.

  3. Fluid flows of mixed regimes in porous media

    Science.gov (United States)

    Celik, Emine; Hoang, Luan; Ibragimov, Akif; Kieu, Thinh

    2017-02-01

    In porous media, there are three known regimes of fluid flows, namely, pre-Darcy, Darcy, and post-Darcy. Because of their different natures, these are usually treated separately in the literature. To study complex flows when all three regimes may be present in different portions of a same domain, we use a single equation of motion to unify them. Several scenarios and models are then considered for slightly compressible fluids. A nonlinear parabolic equation for the pressure is derived, which is degenerate when the pressure gradient is either small or large. We estimate the pressure and its gradient for all time in terms of initial and boundary data. We also obtain their particular bounds for large time which depend on the asymptotic behavior of the boundary data but not on the initial one. Moreover, the continuous dependence of the solutions on initial and boundary data and the structural stability for the equation are established.

  4. Scalable quantum memory in the ultrastrong coupling regime.

    Science.gov (United States)

    Kyaw, T H; Felicetti, S; Romero, G; Solano, E; Kwek, L-C

    2015-03-02

    Circuit quantum electrodynamics, consisting of superconducting artificial atoms coupled to on-chip resonators, represents a prime candidate to implement the scalable quantum computing architecture because of the presence of good tunability and controllability. Furthermore, recent advances have pushed the technology towards the ultrastrong coupling regime of light-matter interaction, where the qubit-resonator coupling strength reaches a considerable fraction of the resonator frequency. Here, we propose a qubit-resonator system operating in that regime, as a quantum memory device and study the storage and retrieval of quantum information in and from the Z2 parity-protected quantum memory, within experimentally feasible schemes. We are also convinced that our proposal might pave a way to realize a scalable quantum random-access memory due to its fast storage and readout performances.

  5. Adult learning, education, and the labour market inthe employability regime

    Directory of Open Access Journals (Sweden)

    Staffan Nilsson

    2013-10-01

    Full Text Available The purpose of this paper is to draw on the research and scholarly literature to explorethe changing discourses and perspectives concerning adult learning, education, and thelabour market in the employability regime. The focus of the nalysis is a Nordic context.The dominant employability regime maintains a technical-rational perspective onlearning and employability. Education is predominantly regarded as an instrumentalpreparation for the labour market. The future demands of the labour market are largelyunknown, however, and vocational and professional training may not provide sufficientpreparation for the increasing complexities of work. Theoretical discussions have beendominated by an alleged mismatch between individual competence and thequalifications that are required in the world of work. There is no consensus regardinghow the gap should be described, explained, or bridged. New demands on educationaldesign have emerged, and ideas related to liberal education and ‘bildung’ have beenreinserted into the political agenda, offering general preparation for a wider array ofchallenges.

  6. Pseudocanalization regime for magnetic dark-field hyperlenses

    DEFF Research Database (Denmark)

    Repän, Taavi; Novitsky, Andrey; Willatzen, Morten

    2017-01-01

    Hyperbolic metamaterials (HMMs) are the cornerstone of the hyperlens, which brings the superresolution effect from the near-field to the far-field zone. For effective application of the hyperlens it should operate in the so-called canalization regime, where the phase advancement of the propagating...... fields is maximally suppressed and thus field broadening is minimized. For conventional hyperlenses it is relatively straightforward to achieve canalization by tuning the anisotropic permittivity tensor. However, for a dark-field hyperlens designed to image weak scatterers by filtering out background...... to the performance of a HMM in the canalized regime. The proposed structure offers additional flexibility over simple HMMs in tuning light propagation. We show that in this “pseudocanalizing” configuration the quality of an image is comparable to a conventional hyperlens, while the desired filtering of the incident...

  7. Quantum no-scale regimes in string theory

    Science.gov (United States)

    Coudarchet, Thibaut; Fleming, Claude; Partouche, Hervé

    2018-05-01

    We show that in generic no-scale models in string theory, the flat, expanding cosmological evolutions found at the quantum level can be attracted to a "quantum no-scale regime", where the no-scale structure is restored asymptotically. In this regime, the quantum effective potential is dominated by the classical kinetic energies of the no-scale modulus and dilaton. We find that this natural preservation of the classical no-scale structure at the quantum level occurs when the initial conditions of the evolutions sit in a subcritical region of their space. On the contrary, supercritical initial conditions yield solutions that have no analogue at the classical level. The associated intrinsically quantum universes are sentenced to collapse and their histories last finite cosmic times. Our analysis is done at 1-loop, in perturbative heterotic string compactified on tori, with spontaneous supersymmetry breaking implemented by a stringy version of the Scherk-Schwarz mechanism.

  8. Study of a spur gear dynamic behavior in transient regime

    Science.gov (United States)

    Khabou, M. T.; Bouchaala, N.; Chaari, F.; Fakhfakh, T.; Haddar, M.

    2011-11-01

    In this paper the dynamic behavior of a single stage spur gear reducer in transient regime is studied. Dynamic response of the single stage spur gear reducer is investigated at different rotating velocities. First, gear excitation is induced by the motor torque and load variation in addition to the fluctuation of meshing stiffness due to the variation of input rotational speed. Then, the dynamic response is computed using the Newmark method. After that, a parameter study is made on spur gear powered in the first place by an electric motor and in the second place by four strokes four cylinders diesel engine. Dynamic responses come to confirm a significant influence of the transient regime on the dynamic behavior of a gear set, particularly in the case of engine acyclism condition.

  9. Mapping reactor operating regimes for heavy gas oil hydrotreating

    Energy Technology Data Exchange (ETDEWEB)

    Munteanu, Mugurel Catalin; Chen, Jinwen [CanmetENERGY, Natural Resources Canada (Canada)

    2011-07-01

    Hydrotreating (HDT) is used in oil refineries at temperatures of 350-400 degree C and pressure of 50-100 bars in a fixed bed to improve the quality of distillate fraction. HDT operates as a gas-liquid-solid process, trickle bed. Efforts have been made to model it but volatilization of liquid oil is often ignored. The aim of this paper is to predict vapor-liquid equilibrium (VLE) for a typical heavy distillate feed in pilot plant hydrotreaters. The study was conducted under various operating conditions and a flash calculation program calibrated in-house was used to predict VLE. VLE values were found and results showed that higher pressure, lower gas/oil ratio and temperature should be used to maintain the desired operating regimes when hydrotreating heavy distillate feed. This study determined the operating conditions for maintaining the desired operating regimes and these findings could be useful for operators.

  10. Endoreversible quantum heat engines in the linear response regime.

    Science.gov (United States)

    Wang, Honghui; He, Jizhou; Wang, Jianhui

    2017-07-01

    We analyze general models of quantum heat engines operating a cycle of two adiabatic and two isothermal processes. We use the quantum master equation for a system to describe heat transfer current during a thermodynamic process in contact with a heat reservoir, with no use of phenomenological thermal conduction. We apply the endoreversibility description to such engine models working in the linear response regime and derive expressions of the efficiency and the power. By analyzing the entropy production rate along a single cycle, we identify the thermodynamic flux and force that a linear relation connects. From maximizing the power output, we find that such heat engines satisfy the tight-coupling condition and the efficiency at maximum power agrees with the Curzon-Ahlborn efficiency known as the upper bound in the linear response regime.

  11. Ginzburg regime and its effects on topological defect formation

    International Nuclear Information System (INIS)

    Bettencourt, Luis M. A.; Antunes, Nuno D.; Zurek, W. H.

    2000-01-01

    The Ginzburg temperature has historically been proposed as the energy scale of formation of topological defects at a second order symmetry breaking phase transition. More recently alternative proposals which compute the time of formation of defects from the critical dynamics of the system have been gaining both theoretical and experimental support. We investigate, using a canonical model for string formation, how these two pictures compare. In particular we show that prolonged exposure of a critical field configuration to the Ginzburg regime results in no substantial suppression of the final density of defects formed. These results eliminate the Ginzburg regime as a possible cause of erasure of vortex lines in the recent 4 He pressure quench experiments. (c) 2000 The American Physical Society

  12. Onset of the nonlinear regime in unified dark matter models

    International Nuclear Information System (INIS)

    Avelino, P.P.; Beca, L.M.G.; Carvalho, J.P.M. de; Martins, C.J.A.P.; Copeland, E.J.

    2004-01-01

    We discuss the onset of the nonlinear regime in the context of unified dark matter models involving a generalized Chaplygin gas. We show that the transition from dark-matter-like to dark-energy-like behavior will never be smooth. In some regions of space the transition will never take place while in others it may happen sooner or later than naively expected. As a result the linear theory used in previous studies may break down late in the matter dominated era even on large cosmological scales. We study the importance of this effect showing that its magnitude depends on the exact form of the equation of state in the low density regime. We expect that our results will be relevant for other unified dark matter scenarios, particularly those where the quartessence candidate is a perfect fluid

  13. Anti-Weak Localization Measurements in the Ballistic Regime

    Science.gov (United States)

    Jayathilaka, Dilhani; Dedigama, Aruna; Murphy, Sheena; Edirisooriya, Madhavie; Goel, Niti; Mishima, Tetsuya; Santos, Michael; Mullen, Kieran

    2007-03-01

    Anti-weak localization dominates at low fields in systems in which spin-orbit coupling is strong. The experimental results are well described by theory [1] in low mobility systems in which the magnetic length (lB) is greater than the mean free path; however high mobility systems with strong spin-orbit interactions, such the InSb based two dimensional systems (2DESs) examined here, are not in this diffusive regime. A recently developed theory [2] addresses both the diffusive and ballistic regimes taking into account both the backscattered and non-backscattered contributions to the conductivity. We will discuss the agreement of the new theory to measurements of InSb 2DESs prepared with both strong Dresselhaus and Rashba effects. [1] S.V. Iordanskii, Yu B. Lyanda-Geller, and G.E. Pikus, JETP Lett. 60, 206 (1994). [2] L.E. Golub, Phys. Rev. B. 71, 235310 (2005).

  14. Management of exchange rate regimes in emerging Asia

    Directory of Open Access Journals (Sweden)

    Ramkishen S. Rajan

    2012-04-01

    Full Text Available This paper revisits the issue of exchange rate regimes in emerging Asia over the decade 1999–2009. It finds that while Asia is home to a wide array of exchange rate regimes, there are signs of gradual movement toward somewhat greater exchange rate flexibility in many of the regional countries. There appears to be evidence of an apparent “fear of appreciation” which is manifested in asymmetric exchange rate intervention—i.e., a willingness to allow depreciations but reluctance to allow appreciations. This policy of effective exchange rate undervaluation is rather unorthodox from a neoclassical sense, but is consistent with a development policy centered on suppressing the price of non-tradable goods relative to tradables (i.e., real exchange rate undervaluation.

  15. Exchange Rate Regime and External Adjustment in CEE Countries

    Directory of Open Access Journals (Sweden)

    Jacek Pietrucha

    2015-04-01

    Full Text Available The paper reviews effects of exchange rate regime's choice for adjustments processes in current accounts (CA in the Central and Eastern Europe countries between 2008-2012. During the period of global financial crisis, Poland may be treated as a handbook example of the reaction of floating exchange rate to shock and adjustments in the form of expenditure switching. However, the Polish experience is not typical among the Central and Eastern Europe countries. There is no evidence for the positive role of floating exchange rate in macroeconomic adjustments after the crisis in Central and Eastern Europe countries which belong to EU. The adjustments in the countries with fixed regimes were fast and deep. The real exchange rate decreased and export, CA and goods and services balance improved, development distance against EU countries was reduced. However, the experience of Baltic countries, which have internal devaluation, should be very carefully conveyed to other countries.

  16. Envisioning, quantifying, and managing thermal regimes on river networks

    Science.gov (United States)

    Steel, E. Ashley; Beechie, Timothy J.; Torgersen, Christian E.; Fullerton, Aimee H.

    2017-01-01

    Water temperatures fluctuate in time and space, creating diverse thermal regimes on river networks. Temporal variability in these thermal landscapes has important biological and ecological consequences because of nonlinearities in physiological reactions; spatial diversity in thermal landscapes provides aquatic organisms with options to maximize growth and survival. However, human activities and climate change threaten to alter the dynamics of riverine thermal regimes. New data and tools can identify particular facets of the thermal landscape that describe ecological and management concerns and that are linked to human actions. The emerging complexity of thermal landscapes demands innovations in communication, opens the door to exciting research opportunities on the human impacts to and biological consequences of thermal variability, suggests improvements in monitoring programs to better capture empirical patterns, provides a framework for suites of actions to restore and protect the natural processes that drive thermal complexity, and indicates opportunities for better managing thermal landscapes.

  17. Elite Struggle and Stability of the Political Regime in Uzbekistan

    Directory of Open Access Journals (Sweden)

    Сабрина Павловна Базылева

    2017-12-01

    Full Text Available The death of the President of Uzbekistan Islam Karimov, an official announcement which appeared in the second half of the day September 2 - involuntarily forced to wonder about his successor and most importantly, about the continuity of the course. Externally, in the country there is peace and order. Islam Karimov has built a stable system, authoritarian regime. This stability is due to the pragmatism of the Uzbek members of the junta. A special role in the economy and politics of Uzbekistan plays a clan system which has evolved over the last 100-120 years according to the territorial principle and immigrants, which today represent the political elite of the country. The article examines Elite struggle and the stability of the political regime in Uzbekistan available today.

  18. Tearing mode growth in a regime of weak magnetic shear

    International Nuclear Information System (INIS)

    Riyopoulos, S.; Hazeltine, R.D.

    1987-06-01

    The nonlinear growth for the m/n ≥ 2 resistive tearing mode is studied in case when the rational surface q(r 0 ) = m/n falls in a regime of weak magnetic shear, q'(r 0 ) ≅ 0. The island width is determined self-consistently from the nonlinear, zero-helicity component of the perturbed magnetic flux that provides the local shear. It is found that the magnetic perturbation keeps growing exponentially in the nonlinear regime on a hybrid resistive-Alfvenic time scale, while the island width and the vorticity grow on a much slower time scale. Accordingly, much faster release of magnetic energy results for modes growing near minima of hollow q profiles

  19. Spectator Effects during Leptogenesis in the Strong Washout Regime

    CERN Document Server

    Garbrecht, Bjorn

    2014-01-01

    By including spectator fields into the Boltzmann equations for Leptogenesis, we show that partially equilibrated spectator interactions can have a significant impact on the freeze-out value of the asymmetry in the strong washout regime. The final asymmetry is typically increased, since partially equilibrated spectators "hide" a part of the asymmetry from washout. We study examples with leptonic and non-leptonic spectator processes, assuming thermal initial conditions, and find up to 50% enhanced asymmetries compared to the limit of fully equilibrated spectators. Together with a comprehensive overview of the equilibration temperatures for various Standard Model processes, the numerical results indicate the ranges when the limiting cases of either fully equilibrated or negligible spectator fields are applicable and when they are not. Our findings also indicate an increased sensitivity to initial conditions and finite density corrections even in the strong washout regime.

  20. Automatic Classification of Offshore Wind Regimes With Weather Radar Observations

    DEFF Research Database (Denmark)

    Trombe, Pierre-Julien; Pinson, Pierre; Madsen, Henrik

    2014-01-01

    Weather radar observations are called to play an important role in offshore wind energy. In particular, they can enable the monitoring of weather conditions in the vicinity of large-scale offshore wind farms and thereby notify the arrival of precipitation systems associated with severe wind...... and amplitude) using reflectivity observations from a single weather radar system. A categorical sequence of most likely wind regimes is estimated from a wind speed time series by combining a Markov-Switching model and a global decoding technique, the Viterbi algorithm. In parallel, attributes of precipitation...... systems are extracted from weather radar images. These attributes describe the global intensity, spatial continuity and motion of precipitation echoes on the images. Finally, a CART classification tree is used to find the broad relationships between precipitation attributes and wind regimes...

  1. Couette flow regimes with heat transfer in rarefied gas

    Energy Technology Data Exchange (ETDEWEB)

    Abramov, A. A., E-mail: alabr54@mail.ru; Butkovskii, A. V., E-mail: albutkov@mail.ru [Zhukovski Central Aerohydrodynamics Institute (Russian Federation)

    2013-06-15

    Based on numerical solution of the Boltzmann equation by direct statistic simulation, the Couette flow with heat transfer is studied in a broad range of ratios of plate temperatures and Mach numbers of a moving plate. Flow regime classification by the form of the dependences of the energy flux and friction stress on the Knudsen number Kn is proposed. These dependences can be simultaneously monotonic and nonmonotonic and have maxima. Situations are possible in which the dependence of the energy flux transferred to a plate on Kn has a minimum, while the dependence of the friction stress is monotonic or even has a maximum. Also, regimes exist in which the dependence of the energy flux on Kn has a maximum, while the dependence of the friction stress is monotonic, and vice versa.

  2. CONVOCATION REGIMES FOR ENVIRONMENTALISM IN BRAZILIAN BUSINESS MAGAZINES

    Directory of Open Access Journals (Sweden)

    Vinicius Prates

    2013-06-01

    Full Text Available The tensions between the liberal-capitalist discourse and the antagonistic discourses of environmentalism are of special interest in Brazil. This paper outlines a study of the convocation regimes employed in environmental reports published in 2010 in the two most prominent Brazilian economics and business magazines, whose communication contracts propose the modalization of executives and companies towards economic success. Its objective is to analyze how enunciators thematize environmental antagonisms while keeping their general communication contract within the liberal-capitalist paradigm. The enunciator constitutes a regime of sameness/otherness, where sameness is built upon the terms of the reformist orientation of environmentalism, while deep ecology and radical ecology are presented as othernesses. The nodal points that connect the chains of equivalence of the discursive field of environmentalism, in terms of environmental reformist sameness, or “sustainability,” are technology and efficient management, which return the reader to the original communication agreement.  

  3. Regime-dependent forecast uncertainty of convective precipitation

    Energy Technology Data Exchange (ETDEWEB)

    Keil, Christian; Craig, George C. [Muenchen Univ. (Germany). Meteorologisches Inst.

    2011-04-15

    Forecast uncertainty of convective precipitation is influenced by all scales, but in different ways in different meteorological situations. Forecasts of the high resolution ensemble prediction system COSMO-DE-EPS of Deutscher Wetterdienst (DWD) are used to examine the dominant sources of uncertainty of convective precipitation. A validation with radar data using traditional as well as spatial verification measures highlights differences in precipitation forecast performance in differing weather regimes. When the forecast uncertainty can primarily be associated with local, small-scale processes individual members run with the same variation of the physical parameterisation driven by different global models outperform all other ensemble members. In contrast when the precipitation is governed by the large-scale flow all ensemble members perform similarly. Application of the convective adjustment time scale confirms this separation and shows a regime-dependent forecast uncertainty of convective precipitation. (orig.)

  4. Computer Language Choices in Arms Control and Nonproliferation Regimes

    International Nuclear Information System (INIS)

    White, G K

    2005-01-01

    The U.S. and Russian Federation continue to make substantive progress in the arms control and nonproliferation transparency regimes. We are moving toward an implementation choice for creating radiation measurement systems that are transparent in both their design and in their implementation. In particular, the choice of a programming language to write software for such regimes can decrease or significantly increase the costs of authentication. In this paper, we compare procedural languages with object-oriented languages. In particular, we examine the C and C++ languages; we compare language features, code generation, implementation details, and executable size and demonstrate how these attributes aid or hinder authentication and backdoor threats. We show that programs in lower level, procedural languages are more easily authenticated than are object-oriented ones. Potential tools and methods for authentication are covered. Possible mitigations are suggested for using object-oriented programming languages

  5. THE POLICY AND THE TRADE REGIME IN ROMANIA AFTER 1990

    Directory of Open Access Journals (Sweden)

    Dobrotă Gabriela

    2009-11-01

    Full Text Available The growth of connections between national economies has generated a consolidation of foreign currency activities, requiring a continuous adjusting regime, both for the foreign currency policy and for the exchange rate to the market mechanisms. In Romania, there have been frequent alterations of the foreign currency policy, requiring the need to create a juridical framework adequate for the market economy and the evolution of financial instruments. This paper presents the main characteristics of the trade regime and the exchange rate policy in Romania after 1990. Practically, the paper reflects a radiography of the main events on the Romanian foreign exchange rate within the context of specific conditions of the Romanian economy and in correlation with the measures adopted by countries from the Central Europe

  6. THE POLICY AND THE TRADE REGIME IN ROMANIA AFTER 1990

    Directory of Open Access Journals (Sweden)

    Dobrotă Gabriela

    2009-11-01

    Full Text Available The growth of connections between national economies has generated a consolidation of foreign currency activities, requiring a continuous adjusting regime, both for the foreign currency policy and for the exchange rate to the market mechanisms. In Romania, there have been frequent alterations of the foreign currency policy, requiring the need to create a juridical framework adequate for the market economy and the evolution of financial instruments. This paper presents the main characteristics of the trade regime and the exchange rate policy in Romania after 1990. Practically, the paper reflects a radiography of the main events on the Romanian foreign exchange rate within the context of specific conditions of the Romanian economy and in correlation with the measures adopted by countries from the Central Europe.

  7. Seletividade de herbicidas pós-emergentes aplicados na soja geneticamente modificada Selectivity of post-emergence herbicides applied on genetically modified soybeans

    Directory of Open Access Journals (Sweden)

    M.E.F. Neto

    2009-06-01

    Full Text Available O experimento foi instalado em área de plantio comercial de soja Roundup Ready®, na região do Pontal do Paranapanema, no município de Euclides da Cunha Paulista-SP, localizada a 20º 43' 11'' S e 50º 10' 20'' W, com uma altitude de 270 m. A fase experimental foi conduzida de dezembro de 2006 a abril de 2007, sob sistema plantio direto, com uma temperatura média de 25 ºC e índice pluviométrico de 800 mm. O solo da área experimental apresenta classe textural franco-argilo arenosa. Objetivou-se com este trabalho avaliar a eficácia e seletividade de glyphosate na formulação Roundup Transorb®, associado aos herbicidas diclosulam, cloransulam-methyl, flumioxazina e S-metolachlor em duas modalidades de aplicação: única, com associação do glyphosate aos herbicidas; e uma sequencial apenas com glyphosate aos 15 DAA, no manejo das plantas daninhas trapoeraba (Commelina benghalensis e corda-de-viola (Ipomoea triloba durante o cultivo da soja. O experimento foi instalado no delineamento de blocos ao acaso, com 12 tratamentos e quatro repetições. Os tratamentos foram distribuídos em arranjo fatorial acrescido de duas testemunhas: sem capina manual e com capina manual. O arranjo fatorial 2 x 5 contemplou duas condições de aplicação dos herbicidas (única e sequencial e cinco herbicidas (glyphosate, glyphosate + diclosulam, glyphosate + cloransulam-methyl, glyphosate + flumioxazin e glyphosate + S-metolachlor. Nas condições de produtos, épocas de aplicação e doses, os resultados mostraram que o herbicida glyphosate aplicado em dose única ou sequencial e suas combinações com diclosulam e cloransulam-methyl na primeira aplicação não promovem fitointoxicação nas plantas de soja. A combinação com flumioxazin e S-metolachlor promoveu atraso no crescimento das plantas e no fechamento da cultura, em razão do efeito na altura dos indivíduos e comprimento dos ramos. No tratamento com o S-metolachlor, isso pode ser explicado

  8. Estudos sobre o regime de competência no setor público brasileiro: os desencontros da discussão acadêmica = Accrual basis in Brazilian public sector studies: the mismatches of Academic discussion

    Directory of Open Access Journals (Sweden)

    Neuton Alcedir de Lima Amaral Amaral

    2014-12-01

    Full Text Available As pesquisas sobre a adoção do regime de competência pelo setor público no Brasil são poucas e incipientes, o que é de se esperar devido à escassez de casos reais para estudo, pois a maioria dos entes federativos ainda não adotou o regime de competência de forma integral. Apesar disso, representam o estado da arte do conhecimento científico no assunto e esta pesquisa buscou identificar as contribuições da academia para a compreensão do regime de competência aplicado ao setor público no Brasil, por meio de uma revisão crítica dos estudos nacionais que tratam do tema. Foram selecionados os artigos que abordam o tema regime de competência no setor público, publicados de 2005-2012 em eventos e periódicos pontuados pela Capes, e que estão relacionados com contabilidade e/ou contabilidade pública. Os resultados indicam que não existe uma tendência definida de linhas de pesquisa e os achados de um estudo não costumam ser comparados com outros. As pesquisas não são levadas adiante, nem por outros autores, nem pelos próprios, e os autores não exploram lacunas deixadas por pesquisas anteriores, sejam elas nacionais ou estrangeiras. As comparações entre os estudos também são prejudicadas, em alguns casos, devido a fragilidades metodológicas. Com isso, as contribuições da academia para a compreensão do regime de competência aplicado ao setor público são bastante fragmentadas, o que pode tornar lento o avanço do tema. The research on the adoption of accrual basis by the public sector in Brazil are few and fledgling, what is expected due to the scarcity of real study cases, because most federal entities have not adopted the accrual basis in it integral form yet. Despite of this, existing research represent the state-of-art of scientific knowledge on the subject and this research has sought to identify the Academy contributions to the understanding of accrual basis applied to the public sector in Brazil through a review

  9. Distributed Low Temperature Combustion: Fundamental Understanding of Combustion Regime Transitions

    Science.gov (United States)

    2016-09-07

    behaviour as compared to ethanol. The latter fuel has also been considered along with methane. Work has also been performed on the further assessment of... behaviour as compared to ethanol. The latter fuel has also been considered along with methane. Work has also been performed on the further assess- ment of...identification of various combustion gas states. A range of Damköhler numbers (Da) from the conventional propagating flamelet regime well into the distributed

  10. The Cornwall-Norton model in the strong coupling regime

    International Nuclear Information System (INIS)

    Natale, A.A.

    1991-01-01

    The Cornwall-Norton model is studied in the strong coupling regime. It is shown that the fermionic self-energy at large momenta behaves as Σ(p) ∼ (m 2 /p) ln (p/m). We verify that in the strong coupling phase the dynamically generated masses of gauge and scalar bosons are of the same order, and the essential features of the model remain intact. (author)

  11. ELECTRONIC PUBLISHING AND THE EVOLVING INTERNATIONAL INTELLECTUAL PROPERTY REGIME

    OpenAIRE

    D. Langenberg

    2000-01-01

    As we leave the Industrial Age behind us and move into the Information Age, the transition from “bricks and mortar” commerce to electronic commerce and from paper to electronic publishing pose major challenges for international intellectual property regimes. Electronic commerce has taken off. Whatever concerns about consumer acceptance there were five years ago have given way to “click and mortar” business models where e-commerce has an established role complementing traditional commerce. The...

  12. Hope for the environment: Free enterprise and other economic regimes

    OpenAIRE

    Baumol, William Jack

    1998-01-01

    This paper is the keynote speech delivered by Professor William Baumol at the First World Congress of Environmental Economists that was held in Venice on June 25-27, 1998. It analyses the situation of the environment under different economic regimes: the feudal society, Marxism and capitalism. After a brief description of the environmental situation in medieval England, in the Soviet Nations, in Eastern Europe, in China and in capitalist countries, the author concludes that each economic regi...

  13. TYPES OF FI SCAL REGIME IN HYDROCARBON EXPLORATION AND PRODUCTION

    Directory of Open Access Journals (Sweden)

    Daria Karasalihović-Sedlar

    2017-01-01

    Full Text Available The choice of the right fi scal regime represents the main object of the energy policy concerning hydrocarbon exploration and production for the state government. For the operator and service companies it represents the terms and conditions for practical conducting of the process in whole. This paper analyse aspects of agreements used in the petroleum indus-try. Elements of agreement, regardless of regime, have been described together with their advantages and disadvantages. Due to the fact that the fi scal regime has to be chosen to attract companies willing to invest in exploration and produc-tion, it represents a relevant part of the business strategy and also a base for the decision making process during start up. It has to minimize the risk for the both parties involved and maximize the state’s share during the exploitation phase. For the companies, it has to be attractive enough to balance risks during the exploration phase with profi ts gained during the exploitation phase. The aim of this paper is to show the existing fi scal systems in the petroleum industry and to analyze the process for concluding a contract regarding the exploration and production of hydrocarbons. An overview of diff er-ent business practices in the oil and gas industry with a detailed breakdown of the contract terms between the parties involved have been described in the paper. The aim of this paper is to show the diff erent possibilities of fi nancial regimes which could help during the negotiation process for conducting hydrocarbon exploration and production for everyone involved.

  14. Performance of different tomato cultivars under organic and inorganic regimes

    International Nuclear Information System (INIS)

    Ali, I.; Khattak, A. M.; Ali, M.; Ullah, K.

    2015-01-01

    To study the performance of different tomato cultivars under organic and inorganic regimes an experiment was conducted at New Developmental Farm, The University of Agriculture, Peshawar, Pakistan during the summer 2013-14. The experiment was laid out in RCBD with split plot arrangement having four replications. Organic regimes (FYM, poultry manure and mushroom compost) and inorganic (NPK) regimes were allotted to main plot, while cultivars (Roma VF, Roma, Super Classic, Bambino and Rio Grande) were subjected to sub plots. Organic and Inorganic regimes significantly (P ≤ 0.01) influenced all the studied attributes of tomato cultivars. Among different cultivars, Roma gave maximum plant survival (93.8 percentage), number of leaves plant (84.1), number of flower inflorescence (5.4), number of fruits inflorescence (4.3), number of fruit plant (25.4), fruit size (63.9 cm) fruit weight plant (9.1 kg) and total yield (22.9 t ha). However, it was closely followed by cultivar Rio Grande for number of leaves plant (79.6), number of flower inflorescence (5.1), number of fruits inflorescence (4.0) and number of fruits plant (24.9). Cultivar Super Classic produced minimum number of leaves plant (67.7), flower inflorescence (4.8), fruit size (60.6 cm), fruit weight plant (8.6 kg) and total yield (21.7 t ha). Similarly, highest plant survival (90.0 percentage), number of flower inflorescence (5.1), number of fruits inflorescence (4.0), number of fruit plant (25.4), fruit size (62.4 ml), fruit weight plant (8.90 kg) and total yield (22.9 t ha) were recorded in plants provided with organic conditions Roma cultivar performed better than other cultivars under the agro climatic condition of Peshawar followed by cultivar Rio Grande. Therefore, organic tomato production, and these two cultivars are recommended to be grown in Peshawar area. (author)

  15. International arbitration and its exclusion from the Brussels regime

    Directory of Open Access Journals (Sweden)

    Hamed Alavi

    2016-06-01

    Full Text Available The Brussels regime, which regulates the matters of transnational litigation excludes arbitration from its scope. Upon formation of the Brussels regime the existing instruments concerning arbitration - the United Nations Convention on Recognition and Enforcement of Foreign Arbitral Awards and the 1961 European Convention on International Commercial Arbitration - were believed to be sufficient. The original Brussels Convention 1968 on recognition and enforcement of judgments delivered in the courts of the EU Member States expressly provided for the exclusion of arbitration. The following Brussels I Regulation followed the trend and reinforced the exclusion of arbitration from their material scopes. The rationale for doing so was primarily the prevention of parallel proceedings and irreconcilable judgments. The arbitration exclusion from the Brussels regime has caused a fair amount of confusion, especially regarding the extent and limits of the exclusion. That is, whether the arbitration agreement, the arbitral award and its consequences are covered by the exclusion or they may fall under the scope of the Brussels regulation if they constitute only an incidental question to the main cause of action? The confusion was illustrated in the ECJ judgment West Tankers, which generated negative feedback from the arbitration community and indicated the need for reform. The recently adopted Recast Regulation took it upon itself to clarify the relationship between arbitration and the EU regime of transnational litigation. The exclusion is reinforced ye again and its boundaries are specified in the Preamble. However, whether or not the concerns about the extent and objectives of arbitration exclusion have been at present eliminated, remains to be seen.

  16. Analysis of dynamic regimes in stochastically forced Kaldor model

    International Nuclear Information System (INIS)

    Bashkirtseva, Irina; Ryazanova, Tatyana; Ryashko, Lev

    2015-01-01

    We consider the business cycle Kaldor model forced by random noise. Detailed parametric analysis of deterministic system is carried out and zones of coexisting stable equilibrium and stable limit cycle are found. Noise-induced transitions between these attractors are studied using stochastic sensitivity function technique and confidence domains method. Critical values of noise intensity corresponding to noise-induced transitions “equilibrium → cycle” and “cycle → equilibrium” are estimated. Dominants in combined stochastic regimes are discussed.

  17. Hydroperiod regime controls the organization of plant species in wetlands

    OpenAIRE

    Foti, R.; del Jesus, M.; Rinaldo, A.; Rodriguez-Iturbe, I.

    2012-01-01

    With urban, agricultural, and industrial needs growing throughout the past decades, wetland ecosystems have experienced profound changes. Most critically, the biodiversity of wetlands is intimately linked to its hydrologic dynamics, which in turn are being drastically altered by ongoing climate changes. Hydroperiod regimes, e.g., percentage of time a site is inundated, exert critical control in the creation of niches for different plant species in wetlands. However, the spatial signatures of ...

  18. Primordial black holes in linear and non-linear regimes

    Energy Technology Data Exchange (ETDEWEB)

    Allahyari, Alireza; Abolhasani, Ali Akbar [Department of Physics, Sharif University of Technology, Tehran (Iran, Islamic Republic of); Firouzjaee, Javad T., E-mail: allahyari@physics.sharif.edu, E-mail: j.taghizadeh.f@ipm.ir [School of Astronomy, Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395-5531, Tehran (Iran, Islamic Republic of)

    2017-06-01

    We revisit the formation of primordial black holes (PBHs) in the radiation-dominated era for both linear and non-linear regimes, elaborating on the concept of an apparent horizon. Contrary to the expectation from vacuum models, we argue that in a cosmological setting a density fluctuation with a high density does not always collapse to a black hole. To this end, we first elaborate on the perturbation theory for spherically symmetric space times in the linear regime. Thereby, we introduce two gauges. This allows to introduce a well defined gauge-invariant quantity for the expansion of null geodesics. Using this quantity, we argue that PBHs do not form in the linear regime irrespective of the density of the background. Finally, we consider the formation of PBHs in non-linear regimes, adopting the spherical collapse picture. In this picture, over-densities are modeled by closed FRW models in the radiation-dominated era. The difference of our approach is that we start by finding an exact solution for a closed radiation-dominated universe. This yields exact results for turn-around time and radius. It is important that we take the initial conditions from the linear perturbation theory. Additionally, instead of using uniform Hubble gauge condition, both density and velocity perturbations are admitted in this approach. Thereby, the matching condition will impose an important constraint on the initial velocity perturbations δ {sup h} {sub 0} = −δ{sub 0}/2. This can be extended to higher orders. Using this constraint, we find that the apparent horizon of a PBH forms when δ > 3 at turn-around time. The corrections also appear from the third order. Moreover, a PBH forms when its apparent horizon is outside the sound horizon at the re-entry time. Applying this condition, we infer that the threshold value of the density perturbations at horizon re-entry should be larger than δ {sub th} > 0.7.

  19. MCNP/X TRANSPORT IN THE TABULAR REGIME

    Energy Technology Data Exchange (ETDEWEB)

    HUGHES, H. GRADY [Los Alamos National Laboratory

    2007-01-08

    The authors review the transport capabilities of the MCNP and MCNPX Monte Carlo codes in the energy regimes in which tabular transport data are available. Giving special attention to neutron tables, they emphasize the measures taken to improve the treatment of a variety of difficult aspects of the transport problem, including unresolved resonances, thermal issues, and the availability of suitable cross sections sets. They also briefly touch on the current situation in regard to photon, electron, and proton transport tables.

  20. Capacity of Fading Channels in the Low Power Regime

    KAUST Repository

    Benkhelifa, Fatma

    2013-01-01

    The low power regime has attracted various researchers in the information theory and communication communities to understand the performance limits of wireless systems. Indeed, the energy consumption is becoming one of the major limiting factors in wireless systems. As such, energy-efficient wireless systems are of major importance to the next generation wireless systems designers. The capacity is a metric that measures the performance limit of a wireless system. The study of the ergodic capacity of some fading channels in the low power regime is the main subject of this thesis. In our study, we consider that the receiver has always a full knowledge of the channel state information. However, we assume that the transmitter has possibly imperfect knowledge of the channel state information, i.e. he knows either perfectly the channel or only an estimated version of the channel. Both radio frequency and free space optical communication channel models are considered. The main contribution of this work is the explicit characterization of how the capacity scales as function of the signal-to-noise ratio in the low power regime. This allows us to characterize the gain due to the perfect knowledge compared to no knowledge of the channel state information at the transmitter. In particular, we show that the gain increases logarithmically for radio frequency communication. However, the gain increases as log2(Pavg) or log4(Pavg) for free-space optical communication, where Pavg is the average power constraint imposed to the input. Furthermore, we characterize the capacity of cascaded fading channels and we applied the result to Rayleigh-product fading channel and to a free-space optical link over gamma-gamma atmospheric turbulence in the presence of pointing errors. Finally, we study the capacity of Nakagami-m fading channel under quality of service constraints, namely the effective capacity. We have shown that the effective capacity converges to Shannon capacity in the very low