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Sample records for central hidroelectrica ingeniero

  1. Overhaul of the generator of the hydroelectric central station Ingeniero Carlos Ramirez Ulloa; Rehabilitacion del generador de la unidad 2 de la central hidroelectrica ingeniero Carlos Ramirez Ulloa

    Energy Technology Data Exchange (ETDEWEB)

    Robles Pimentel, Edgar [Instituto de Investigaciones Electricas, Cuernavaca (Mexico); Garcia Hernandez, Javier [Comision Federal de Electricidad, Mexico, D. F. (Mexico)

    1997-12-31

    In November 1995, the failure of the Unit 2 generator at the hydroelectric central station Ingeniero Carlos Ramirez Ulloa, El Caracol, occurred. The accident forced to carry out its overhaul. Here are presented the technical problems faced during the overhaul of the generator and analyzed the implemented solutions. [Espanol] En noviembre de 1995 ocurrio la falla del generador de la unidad 2 de la central hidroelectrica Ing. Carlos Ramirez Ulloa, El Caracol. El accidente obligo a llevar a cabo su rehabilitacion. Se presentan los problemas tecnicos enfrentados durante la rehabilitacion del generador y se discuten las soluciones implementadas.

  2. Electric generator overhaul of the Ing. Carlos Ramirez Ulloa hydroelectric. Central project conclusions; Rehabilitacion de los generadores de la central hidroelectrica Ing. Carlos Ramirez Ulloa. Conclusiones del proyecto

    Energy Technology Data Exchange (ETDEWEB)

    Campuzano Martinez, Ignacio Roberto; Gonzalez Vazquez, Alejandro Esteban; Robles Pimentel, Edgar Guillermo; Esparza Saucedo, Marcos; Garcia Martinez, Javier; Sanchez Flores, Ernesto; Martinez Romero, Jose Luis [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1998-12-31

    The Hydroelectric Ing. Carlos Ramirez Ulloa Power Central has three 200 MW electric generators. The Central initiated its commercial operation in 1985. The electric generators had design problems that were properly corrected in an overhaul program that was initiated in 1996, with Unit 2 electric generator and completed in 1998 with Unit 1 electric generator. This paper presents the relevant aspects of the experience accumulated in the project. [Espanol] La central hidroelectrica Ing. Carlos Ramirez Ulloa cuenta con tres generadores de 200 MW cada uno. La central inicio su operacion comercial en 1985. Los generadores tenian problemas de diseno que fueron debidamente corregidos en un programa de rehabilitacion que inicio en 1996, con el generador de la unidad 2, y culmino en 1998 con el generador de la unidad 1. En este articulo se presentan los aspectos relevantes de la experiencia acumulada en el proyecto.

  3. The repair of an electric generator at the Patla hydro central; Reparacion de un generador de la central hidroelectrica de Patla

    Energy Technology Data Exchange (ETDEWEB)

    Vazquez Hernandez, Roman [Luz y Fuerza del Centro, Mexico, D. F. (Mexico)

    1997-12-31

    This document describes the repair of the Generator Number 1 of the system of the Unit No. 1 of the Patla Hydro Power Central in Mexico. The tests that were conducted to determine the fault and the location of the same are shown. Mention is made of the fault repair options and the stages in one of the options are described, since it is the one that better covers the expectations for the satisfactory repair of the generator. Finally the commissioning test is described and it is concluded that an increment of 92% (14 MW) in the generation capacity of the unit was achieved, being this the first time a repair of this type is made of generating units [Espanol] Este documento describe la reparacion del generador numero 1 del sistema de la unidad numero 1 de la central hidroelectrica de Patla en Mexico. Se muestran las pruebas que se hicieron para determinar la falla y localizacion de la misma. Se mencionan las alternativas de reparacion de la falla y se describen las etapas de una de las alternativas, ya que es la que cubre mejor las expectativas para la reparacion satisfactoria del generador. Por ultimo se describe la prueba de puesta en servicio y se concluye en que se logro un aumento de la capacidad de generacion de la unidad en un 92% (14 MW), siendo la primera vez que se hace una reparacion de este tipo de unidades generadoras

  4. Methodology for maintenance analysis based on hydroelectric power stations reliability; Metodologia para realizar analisis de mantenimiento basado en confiabilidad en centrales hidroelectricas

    Energy Technology Data Exchange (ETDEWEB)

    Rea Soto, Rogelio; Calixto Rodriguez, Roberto; Sandoval Valenzuela, Salvador; Velasco Flores, Rocio; Garcia Lizarraga, Maria del Carmen [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2012-07-01

    A methodology to carry out Reliability Centered Maintenance (RCM) studies for hydroelectric power plants is presented. The methodology is an implantation/extension of the guidelines proposed by the Engineering Society for Advanced Mobility Land, Sea and Space in the SAE-JA1012 standard. With the purpose of answering the first five questions, that are set out in that standard, the use of standard ISO14224 is strongly recommended. This approach standardizes failure mechanisms and homogenizes RCM studies with the process of collecting failure and maintenance data. The use of risk matrixes to rank the importance of each failure based on a risk criteria is also proposed. [Spanish] Se presenta una metodologia para realizar estudios de mantenimiento Basado en Confiabilidad (RCM) aplicados a la industria hidroelectrica. La metodologia es una implantacion/ extension realizada por los autores de este trabajo, de los lineamientos propuestos por la Engineering Society for Advanced Mobility Land, Sea and Space en el estandar SAE-JA1012. Para contestar las primeras cinco preguntas del estandar se propone tomar como base los modos y mecanismos de fallas de componentes documentados en la guia para recopilar datos de falla en el estandar ISO-14224. Este enfoque permite estandarizar la descripcion de mecanismos de fallas de los equipos, tanto en el estudio RCM como en el proceso de recopilacion de datos de falla y de mantenimiento, lo que permite retroalimentar el ciclo de mejora continua de los procesos RCM. Tambien se propone el uso de matrices de riesgo para jerarquizar la importancia de los mecanismos de falla con base en el nivel de riesgo.

  5. Reliability of hydroelectric generation components, systems and units; Confiabilidad de componentes, sistemas y unidades de generacion hidroelectrica

    Energy Technology Data Exchange (ETDEWEB)

    Sanchez Sanchez, Ramon; Torres Toledano, Gerardo; Franco Nava, Jose Manuel [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1996-12-31

    This article presents a methodology for the calculation of the reliability of components, systems and hydroelectric generating units, as well as the scope of a computational system for the evaluation of such reliability. In the case of the reliability calculation of components and systems, the computer programs is not limited to hydro stations and can be used in other type of systems. [Espanol] En este articulo se presenta una metodologia para calcular la confiabilidad de componentes, sistemas y unidades de generacion hidroelectrica, asi como el alcance de un sistema computacional para evaluar dicha confiabilidad. En el caso del calculo de confiabilidad de componentes y sistemas, el programa de computo no se limita a centrales hidroelectricas y puede utilizarse en otro tipo de sistemas.

  6. Electro-economic, environmental and social consequences in the efficient abatement of a hydroelectric plant (C. H. Santa Rosa, CFE-ACO); Consecuencias electro-economicas, ambientales y sociales del abatimiento eficiente de una central hidroelectrica (C. H. Santa Rosa, CFE-ACO)

    Energy Technology Data Exchange (ETDEWEB)

    Narvaez Perez, Camilo; Garcia Conejo, Dante Aristoteles [Comision Federal de Electricidad, Centro Nacional de Control de Energia, Area de Control Occidental, Zapopan, Jalisco (Mexico)]. E-mail: camilo.narvaez@cfe.gob.mx; camilo.narvaez@univa.mx; Narvaez Perez, Claudia Universidad de Guadalajara, Zapopan, Jalisco [Mexico]). E-mail: claudia_narvaez@hotmail.com; Blanco Gomez, Cesar Eduardo [Comision Federal de Electricidad, Centro Nacional de Control de Energia, Area de Control Occidental, Zapopan, Jalisco (Mexico)

    2013-03-15

    Renewable energy systems, like hydroelectric generation system gives electric energy, in reliable economic, it takes care with environment, and growths the society, if the hydroelectric dam is suitably drained in non rainy season, if we consider, flow rate in its river, rain, thunderstorms and floods, dam's size, load shape per day, generators capacity unit and the flow in turbines, generating units maintenance and other necessities like irrigation crops in farms. In this research we propose a new methodology about hydroelectric dam drained in non rainy season. But in rainy season, you can consider this methodology with few changes and you would obtain satisfactory results. The methodology is used since 2010 in the Area de Control Occidental in the Comision Federal de Electricidad with results compared with data from previous years, in which different methodologies were applied. [Spanish] Los sistemas de energias renovables, como los complejos hidroelectricos impactan de manera electrica, economica, ambiental y social, siempre y cuando se realice adecuadamente el abatimiento de la presa en el estiaje, considerando, el aporte del cauce, las lluvias aun siendo escasas, el tamano del embalse, la demanda horaria de la carga abastecida, el tamano de los generadores y su gasto turbinado, los mantenimientos de las unidades, las necesidades hidraulicas aguas abajo y demas imponderantes. En esta investigacion se propone una metodologia de abatimiento de presas de centrales hidroelectricas en estiaje. Y para tiempo de lluvias se aplica la metodologia con variantes pequenas y con resultados satisfactorios. La metodologia es utilizada desde el 2010 en el Area de Control Occidental de la Comision Federal de Electricidad, con resultados comparados con los datos de los anos anteriores, en los cuales se aplicaron metodologias diversas.

  7. EL PRESENTE Y FUTURO DE LOS INGENIEROS

    Directory of Open Access Journals (Sweden)

    Zorrilla Gascón, Miguel Ángel

    2014-05-01

    Full Text Available Hoy en día, la tasa de desempleo del ingeniero español es mucho más elevada de lo deseado, y ha provocado que muchos de nosotros nos hayamos tenido que especializar a edades “avanzadas” o reinventar o simplemente cambiar de actividad profesional.

  8. Administración para ingenieros

    OpenAIRE

    1999-01-01

    "La ingeniería se define hoy como la ciencia, el arte y la técnica en beneficio de la humanidad, a partir de leyes físicas y de aprovechamiento de los recursos dentro de un contexto de equilibrio con el medio ambiente y el ser humano". Esta definición aparece en el artículo "Nuevo perfil ingenieros técnicos, con visión gerencial" de la revista Clase Empresarial de mayo de 1996. La concentración del ingeniero en lo operativo y el orgullo de su técnica le ha impedido a ese profesional la visión...

  9. Benchmarking: retos y riesgos para el ingeniero industrial

    Directory of Open Access Journals (Sweden)

    Sergio Humberto Romo Picazo

    2000-01-01

    Full Text Available Los métodos para el análisis y solución de problemas que tradicionalmente ha usado el ingeniero industrial pueden adoptar un enfoque distinto, usando el concepto de benchmarking. El benchmarking representa una herramienta muy importante para los ingenieros industriales, ya que bien aplicada conduce al mejoramiento de los procesos. Sin embargo, todo ingeniero industrial debe conocer las limitaciones y riesgos que implica la decisión de llevar a cabo un proyecto de benchmarking, aquí se señalan algunos de ellos.

  10. Mecánica de medios continuos para ingenieros

    OpenAIRE

    2002-01-01

    Mecánica de medios continuos para ingenieros pretende ser una herramienta para la formación de los ingenieros en la mecánica de medios continuos, que mantiene un equilibrio adecuado entre la rigurosidad de su planteamiento y la claridad de los principios físicos tratados. El contenido del texto está claramente dividido en dos partes, que se presentan secuencialmente. En la primera (capítulos 1 a 5), se introducen los aspectos fundamentales y descriptivos comunes a todos los medios continu...

  11. El Ingeniero Agrícola en la Agroindustria

    Directory of Open Access Journals (Sweden)

    Ramos Sarria Ramiro

    1985-12-01

    Full Text Available En este artículo se da a conocer la capacidad técnica y administrativa que posee el Ingeniero Agrícola, para organizar un sistema coherente que logre definir, planificar y promover una política de desarrollo científico y tecnológico en la agroindustria.

  12. Hydroelectric microcentrals for small consumption centers; Microcentrales hidroelectricas para pequenos centros de consumo

    Energy Technology Data Exchange (ETDEWEB)

    Angeles A, V. H.; Espino C, F. P. [Universidad Autonoma Metropolitana, Mexico, D. F. (Mexico); Buitron Sanchez, H. C. [Programa de Ahorro de Energia para el Sector Electrico, Mexico, D. F. (Mexico)

    1995-12-31

    The utilization of alternate energy sources (wind power, solar and hydro to small scale) represents an option for the rural electrification. This paper analyzes the case of hydro microgeneration, for this purpose the mechanical and electrical fitting are mainly discussed. For the mechanical re-equipment the turbine types that can be used are fundamentally presented and how they can be selected. As to the electrical re-equipment the different types of electric generators are discussed, as well as the form of selecting them, the operation, the control and the protection in the hydroelectric microcentrals. [Espanol] La utilizacion de fuentes alternas de energia (eolica, solar e hidraulica a pequena escala) representan una alternativa para la electrificacion rural. Este trabajo trata del caso de la microgeneracion hidraulica para la cual se discuten principalmente, alternativas para el equipamiento mecanico y electrico. Para el equipamiento mecanico se presentan fundamentalmente los tipos de turbinas que pueden ser utilizadas y como se pueden seleccionar. En cuanto al equipo electrico se manejan los diferentes tipos de generadores, la forma de seleccionarlos, la operacion, el control y la proteccion en las microcentrales hidroelectricas.

  13. Dos cubiertas del ingeniero Heinz Hossdorf, Suiza

    Directory of Open Access Journals (Sweden)

    Editorial, Equipo

    1966-07-01

    Full Text Available I. Reading hall of the Bale University Library Otto H. Senn, architect The roof of the central hall is the most outstanding feature, and consists of six hyperbolic paraboloidal thin shells, placed along a ring. They transmit the thrusts to a prestressed outer hoop, which is part of the intermediate reading gallery. This hoop is connected with the rest of the gallery structure by means of a metallic triangulated structure. 2. Public hall of the «Rudolf Steiner» School at Bale H. F. Leu, architect In this original constructional design the end public stand of the hall cantilevers over ¿he lower platform, and also serves as support for the polyhedrical roof; this consists of reinforced concrete slabs, 12 cm in thickness. There is a perimetral hoop and reinforcing ribs, which help to transmit most of the load to the springers of the overhanging structure.1. Sala de lectura de la Biblioteca de la Universidad de Basilea La cubierta del espacio central, que es la más interesante, se compone de seis paraboloides hiperbólicos—definidos por estructuras laminares—, en disposición radial, los cuales transmiten sus empujes a un anillo pretensado de borde, que constituye la cubierta de la galería intermedia. Dicho anillo se enlaza con el borde de la galería por medio de una estructura triangulada metálica. 2. Salón de actos de la Escuela "Rudolf Steiner" en Basilea Esta original solución constructiva es consecuencia de que la tribuna de fondo vuela en ménsula sobre la planta inferior, sirviendo, a la vez, de apoyo para la cubierta poliédrica, constituida por placas de hormigón armado de 12 cm de espesor. Se han organizado el zuncho perimetral y los nervios de refuerzo, de forma que la mayor parte de la carga se transmita a las esquinas de arranque del cuerpo volado.

  14. Las Competencias del Ingeniero Industrial en el Estado de Colima

    OpenAIRE

    Miguel Escamilla López; Jorge Meza Jiménez; María Sánchez Losoya; Miguel Ríos Farías; Juan José Topete Torres; Patricia Margarita Suárez Cisneros

    2014-01-01

    Actualmente en México casi todas las instituciones públicas de educación superior trabajan bajo el enfoque basado en competencias, pero respecto de la ingeniería industrial, ¿cuáles son las competencias que el sector industrial de una determinada región o estado requiere de estos profesionistas?. El objetivo del presente trabajo fue determinar las competencias profesionales básicas y específicas de un ingeniero industrial, que satisfagan las necesidades actuales de la industria del estado de ...

  15. Dos cubiertas del ingeniero Heinz Hossdorf (Suiza

    Directory of Open Access Journals (Sweden)

    Editorial, Equipo

    1966-09-01

    Full Text Available Cement factories at Liesberg Burckhardt, architect The roof shells of the roof of this factory are noteworthy because they are fitted with a minimum sized hoop ring, and with an additional tie member. Tensioning has been carried out by a special procedure, from the centre of the shell. Laboratory for the Secheron Factory M. & W. Rohner; P. Schatt & O. Trottmann, architects The outstanding structural feature of this factory is a main concrete girder, built in situ, from which prestressed ribs branch off every 2.50 m. At the end of these ribs metal tie hangers support part of the enclosing factory walls.Fábrica de Cemento en Líesberg Las láminas de esta cubierta se caracterizan por tener el anillo de borde en forma de arco de sección mínima, con un tirante auxiliar, y por el sistema de tesado, realizado desde el centro de la lámina por un procedimiento especial. Laboratorio para la Fábrica Secheron Consta, fundamentalmente, de una viga central hormigonada «in situ» de la que parten, cada 3,5 m, unos nervios pretensados, cuyos extremos se cuelgan, mediante tirantes metálicos, los elementos que constituyen los apoyos de la fachada.

  16. Las Competencias del Ingeniero Industrial en el Estado de Colima

    Directory of Open Access Journals (Sweden)

    Miguel Escamilla López

    2014-01-01

    Full Text Available Actualmente en México casi todas las instituciones públicas de educación superior trabajan bajo el enfoque basado en competencias, pero respecto de la ingeniería industrial, ¿cuáles son las competencias que el sector industrial de una determinada región o estado requiere de estos profesionistas?. El objetivo del presente trabajo fue determinar las competencias profesionales básicas y específicas de un ingeniero industrial, que satisfagan las necesidades actuales de la industria del estado de Colima. El proceso de investigación consistió en el diseño y aplicación de encuestas vía electrónica a diversas empresas de todos los tamaños y sectores del estado; los resultados obtenidos muestran que se requiere una actualización del perfil profesional del ingeniero industrial, identificando ocho competencias básicas y diez competencias específicas necesarias para satisfacer las necesidades de su sector industrial.

  17. The simulators: truth and power in the psychiatry of José Ingenieros.

    Science.gov (United States)

    Caponi, Sandra

    2016-01-01

    Using Michel Foucault's lectures on "Psychiatric power" as its starting point, this article analyzes the book Simulación de la locura (The simulation of madness), published in 1903 by the Argentine psychiatrist José Ingenieros. Foucault argues that the problem of simulation permeates the entire history of modern psychiatry. After initial analysis of José Ingenieros's references to the question of simulation in the struggle for existence, the issue of simulation in pathological states in general is examined, and lastly the simulation of madness and the problem of degeneration. Ingenieros participates in the epistemological and political struggle that took place between experts-psychiatrists and simulators over the question of truth.

  18. Operator training for the Yacyreta binational hydroelectric power plant; Formacion de operadores para la Central Hidroelectrica de Yacireta

    Energy Technology Data Exchange (ETDEWEB)

    Dure, Francisco; Tachella, Heriberto [Entidad Binacional Yacyreta, Isla Yacireta (Paraguay). Central Hidroelectrica Yacyreta]. E-mail: yacyreta@internet.siscotel.com

    1998-07-01

    This work is oriented to the power plant operators, by exposing the criteria and methods adopted for operators selection, training and incorporation to the Yacyreta Hydroelectric Power Plant. The used criteria considered some aspects, as follows: the operation staff should be consisted of equal numbers of Argentine and Paraguayan nationalities, viewing the both systems operation; experience of the shift supervisors in operating a plant for a minimum of 10 years; the supervisors should participate training the auxiliary operators.

  19. The hydroelectric power plant as a project of private investment; La central hidroelectrica como proyecto de inversion privada

    Energy Technology Data Exchange (ETDEWEB)

    Guerra, Eduardo [Industrias Metalurgicas Pescarmona S.A. (IMPSA), Mendoza (Argentina)]. E-mail: guerra@impsa.com.ar

    2001-07-01

    The paper describes the process to be followed for the performance, construction and operation of a hydroelectric investment from the view point of a private investor. The paper demonstrates that it is possible to finance the project through the 'project finance', where the finance has as guarantee the own assets and the fund fluxes of the investment.

  20. El papel del ingeniero mecánico en el contexto energético actual

    OpenAIRE

    María Dolores Durán García

    2010-01-01

    En el presente trabajo se analiza, en primer término, la evolución del papel del ingeniero a través de la historia, desde sus orígenes en la Revolución Industrial hasta nuestros días; asimismo se abordan las diferentes formas en que se ha ido concibiendo la función del ingeniero mecánico y los efectos de la situación económica, tecnológica y medioambiental en estas percepciones sociales. Esta última implicación, la ambiental, sirve de base para establecer la responsabilidad actual de este pro...

  1. Competencias profesionales de un ingeniero en alimentos. Un estudio sobre su formación matemática

    OpenAIRE

    Muñoz, Hernán

    2004-01-01

    Esta presentación da cuenta de una investigación de tipo cualitativo que genera y sistematiza la información sobre las competencias profesionales y matemáticas de un Ingeniero en Alimentos. Las fuentes utilizadas fueron análisis bibliográfico sobre competencias profesionales, focus group realizados con ingenieros en alimentos de empresas y con académicos de universidades y entrevistas en profundidad realizadas a académicos de las universidades y a ingenieros en alimentos. Se integró y comparó...

  2. APLICACIÓN DE LAS TÉCNICAS MULTICRITERIO MULTIEXPERTOS DENTRO DEL PERFIL DEL INGENIERO INDUSTRIAL

    Directory of Open Access Journals (Sweden)

    Elvis Salinas González

    2005-06-01

    Full Text Available

    Los ingenieros industriales se desarrollan en un ámbito empresarial y dentro de las actividades que realizan están implícitos una serie de procesos de toma de decisiones. De hecho, dirigir es tomar decisiones que se concretan en impartir instrucciones, coordinar personas, liderar grupos y asumir compromisos por ejemplo: contratar un proyecto, seleccionar un obrero, etc. Ellos deben tener los conocimientos necesarios para saber organizar y programar los trabajos que deben efectuarse, asignar los recursos necesarios para ello, y adoptar las medidas para corregir desviaciones que puedan existir. Es por esto, que en el presente trabajo se muestran algunos problemas propios de la esferas de trabajo del ingeniero industrial donde es importante la aplicación de técnicas multicriterio multiexperto

  3. Project of the new measurement system for energy invoicing - Itaipu Hydroelectric Central; Proyecto del nuevo sistema de medicion de energia para facturacion de la Central Hidroelectrica de Itaipu

    Energy Technology Data Exchange (ETDEWEB)

    Montania E, Julio Cesar [Usina Hidroelectrica de Itaipu Binacional, Assuncion (Paraguay)

    2001-07-01

    Itaipu Binacional has taken a decision of executing a technological updating for the energy measurement system through the substitution of the current system by other one equipped with digital devices. The main reasons for that were the following: a) The equipment in operation were of an outdated generation b) The accuracy class of the existing equipment was of 0.5%, but the tendency for invoicing measurements was to install meters with accuracy class of 0.2% in the enterprises c) The requirements of ONS/MAE, in Brazil, which establishes the minimum requisites to be attended by invoicing measurement systems.

  4. Deslindes y Servidumbres: El papel del Ingeniero Técnico en Topografía (II)

    OpenAIRE

    Femenia Ribera, Carmen; SORIANO HERNÁNDEZ, VÍCTOR

    2005-01-01

    En el presente artículo, se pretende realizar un estudio recopilatorio de los distintos tipos de deslindes y servidumbres que podemos encontrar en España. Los casos más interesantes son los que fija la Administración y que están regulados por la legislación actual. Tanto en los deslindes como en las servidumbres, la labor del Ingeniero Técnico en Topografía es fundamental a la hora de delimitar las zonas de actuación, plasmándolas físicamente o bien elaborando una...

  5. Deslindes y Servidumbres: El papel del Ingeniero Técnico en Topografía (I)

    OpenAIRE

    Femenia Ribera, Carmen; SORIANO HERNÁNDEZ, VÍCTOR

    2005-01-01

    En el presente artículo, se pretende realizar un estudio recopilatorio de los distintos tipos de deslindes y servidumbres que podemos encontrar en España. Los casos más interesantes son los que fija la Administración y que están regulados por la legislación actual. Tanto en los deslindes como en las servidumbres, la labor del Ingeniero Técnico en Topografía es fundamental a la hora de delimitar las zonas de actuación, plasmándolas físicamente o bien elaborando una carto...

  6. La formación del ingeniero hidráulico

    OpenAIRE

    Kobus, Helmut; Plate, Erich; Shen, Hsieh Wen; Szöllösi-Nagy, A.

    1994-01-01

    En este artículo un comité de expertos pertenecientes a las asociaciones AIHR (Asociación Internacional de Investigaciones Hidráulicas) y UNESCO, con una reflexión común presentan los recientes desarrollos en Ingeniería Hidráulica y sus aplicaciones para la formación de ingenieros hidráulicos. Las estructuras de las disciplinas fundamentales subyacentes, geociencias y ciencias de la ingeniería y la gran variedad de asignaturas de ingeniería envueltas deben ser consideradas en el contexto m...

  7. Coordinación de las materias del nuevo grado Ingeniero Agroalimentario

    OpenAIRE

    2010-01-01

    El proyecto pretendía llevar a cabo la coordinación vertical y horizontal necesaria para el adecuado planteamiento y desarrollo del nuevo plan de estudios del Grado en Ingeniero Agroalimentario. El desarrollo de la elaboración del nuevo título por parte de la comisión correspondiente (de la cual formo parte) puso de manifiesto la falta de entusiasmo y motivación de un parte del profesorado. Por esta razón el presente proyecto pretendía ser un estímulo para el trabajo de coordinación que va...

  8. Coordinación del nuevo Grado Ingeniero Alimentario. Cursos: tercero y cuarto

    OpenAIRE

    2011-01-01

    El proyecto pretendía llevar a cabo la coordinación vertical y horizontal necesaria para el adecuado planteamiento y desarrollo del nuevo plan de estudios del Grado en Ingeniero Agroalimentario. Se pretendía con él que todos aquellos profesores que se implicasen activamente en esta coordinación (realizando las tareas que se les soliciten y asistiendo a las reuniones y seminarios) fueran reconocidos como miembros del equipo investigador del presente proyecto y recibiendo el certificado de part...

  9. Enseñanza e Ingeniería en Colombia: El caso de la Escuela de Ingenieros de la Universidad Nacional, 1867-1890

    Directory of Open Access Journals (Sweden)

    Mauricio Moscoso Díaz

    2004-12-01

    Full Text Available This article deals with the teaching of engineering, from an institutional perspective, in Colombia through the political and economic factors that affected the School of Engineering of the National University. Due to political instability and budgetary restrictions, the academic offerings were limited and the survival of the School itself was threatened. This article points to the means through which the Colombian élite strengthened technology and relations with the state. The article also shows how the number and influence of engineers grew as a consequence of the opening of new networks of communication in Colombia.//El presente artículo aborda la enseñanza de Ia ingeniería en Colombia, a partir de los factores políticos y económicos que afectaron la Escuela de Ingenieros de la Universidad Nacional, desde una perspectiva institucional. Observa que debido a la inestabilidad y las restricciones presupuestales, se limitaron las posibilidades académicas y se pusieron en peligro Ia supervivencia de las instituciones educativas. No obstante el estudio señala los mecanismos mediante los cuales la élite colombiana, orientó sus esfuerzos hacia la sofisticación técnica a pesar del estatismo. Explora igual¬mente las relaciones existentes con el Estado, durante la coyuntura entre el radicalismo liberal y el advenimiento de la Regeneración. Finalmente alude a la economía de exportación, como eje central que posibilitó la construcción de vías de comunicación, y el consecuente ascenso de los ingenieros.

  10. El papel del ingeniero mecánico en el contexto energético actual

    Directory of Open Access Journals (Sweden)

    María Dolores Durán García

    2010-01-01

    Full Text Available En el presente trabajo se analiza, en primer término, la evolución del papel del ingeniero a través de la historia, desde sus orígenes en la Revolución Industrial hasta nuestros días; asimismo se abordan las diferentes formas en que se ha ido concibiendo la función del ingeniero mecánico y los efectos de la situación económica, tecnológica y medioambiental en estas percepciones sociales. Esta última implicación, la ambiental, sirve de base para establecer la responsabilidad actual de este profesional de la Ingeniería en el consumo de energía, tanto en México como a nivel mundial y el papel que debe cumplir en el diseño de sistemas que permitan transformar y/o emplear la energía de manera racional y eficiente. Con base en lo anterior, finalmente se indican algunos de los conocimientos y habilidades que este profesional debe adquirir durante su formación profesional, para cumplir con esta importante responsabilidad.

  11. Labor urbanística y desarrollo local de los ingenieros militares en La Habana, Cuba. Siglo XIX

    Directory of Open Access Journals (Sweden)

    María Victoria Zardoya Loureda

    2015-03-01

    El presente trabajo se centra en la labor de los ingenieros militares durante el siglo XIX, relacionada con el importante cambio de escala e imagen que transformó a la capital cubana a lo largo de esos años.

  12. La formación del ingeniero hidráulico para el siglo XXI

    OpenAIRE

    Lopardo, Raúl A.

    1995-01-01

    Los cambios producidos por la revolución electrónica, la generalización de la informática y la valoración ambiental indican la necesidad de introducir modificaciones de fondo en la formación de los ingenieros hidráulicos de cara al Siglo XXI. Se reivindica el interés de enfatizar la relevancia de la carrera de Ingeniería Hidráulica, detallándose su campo de acción y las posibilidades profesionales que actualmente se presentan en el tema. dado lo vertiginoso de las alteraciones que se están ge...

  13. La medicion de la absorcion de luz de soluciones quimicas, una practica social de ingenieros bioquimicos

    OpenAIRE

    Galicia, Adriana; Arrieta, Jaime; Landa, Lorena

    2007-01-01

    En éste artículo, mostramos evidencias de la interacción de estudiantes de ingeniería bioquímica en la construcción de lo lineal a partir de la modelación de la absorción de luz de soluciones de glucosa a diferentes concentraciones en el laboratorio de química, tomando como premisa que ésta actividad es una practica social que se realiza en comunidades de ingenieros bioquímicos en el análisis cuantitativo para determinar la concentración de una sustancia en una muestra a partir de la medición...

  14. Competencias matemáticas de ingenieros informáticos egresados: un estudio descriptivo

    Directory of Open Access Journals (Sweden)

    Barbarán Sánchez, Juan Jesús

    2016-07-01

    Full Text Available El enfoque competencial de la enseñanza es una de las principales novedades que incluye el Espacio Europeo de la Educación Superior (EEES. De acuerdo con esta perspectiva, resulta interesante determinar qué competencias ponen en práctica los egresados de cualquier titulación en su trabajo. En este artículo presentamos los resultados de una investigación descriptiva en la que analizamos las competencias matemáticas que usan los ingenieros informáticos en el ejercicio de su profesión. Para ello, se seleccionó una muestra incidental formada por 414 sujetos egresados de diferentes universidades españolas. La metodología utilizada es cuantitativa y ha constado de las siguientes fases: diseño de la encuesta, validación de la misma a través de una prueba piloto y por parte de expertos, distribución de la encuesta entre los egresados y análisis de los resultados. Los datos analizados muestran que los ingenieros informáticos egresados utilizan las competencias matemáticas en su labor profesional siendo la competencia algebraica la más usada y la competencia numérica la que consideran que necesitarían más formación académica que la recibida en sus estudios universitarios para desempeñar de manera eficiente su labor profesional. Este hecho nos revela la importancia que tiene el desarrollo de la citada competencia en su formación académica.

  15. Los nuevos planes de estudios y el Dibujo Técnico. Influencia en la formación del nuevo Ingeniero Técnico Industrial

    OpenAIRE

    1997-01-01

    La presente comunicación pretende encontrar respuesta a las crecientes inquietudes que la implantación de los nuevos planes de estudios en nuestros centros docentes está produciendo, así como las necesidades de formación del ingeniero ante la U.E. y ante una sociedad cada vez más exigente y competitiva, en capacidades tan importantes como es la visión espacial del ingeniero.

  16. RESPUESTA DE PECES NATIVOS A FLUCTUACIONES DE CAUDAL PRODUCIDAS POR LA OPERACION DE CENTRALES HIDROELECTRICAS EN EL RIO BIO-BIO

    OpenAIRE

    2011-01-01

    Los sistemas fluviales son ecosistemas de alta diversidad ambiental, cuyos procesos naturales operan mientras se mantengan las condiciones de heterogeneidad espacio–temporal. La biota acuática de estos ecosistemas responde a dicha diversidad presentando patrones de distribución que varían a escala espacial y temporal, asociadas a variables como la disponibilidad de hábitat, la oferta de alimento y el gasto energético asociado a mantenerse en un hábitat. Estas variables pueden ser alteradas...

  17. Interaction between operation and maintenance in the Itaipu Hydroelectric Power Plant, Brazil; Interacciones entre operacion y mantenimiento en la Central Hidroelectrica Itaipu

    Energy Technology Data Exchange (ETDEWEB)

    Vergara Baez, Carlos A. [Itaipu Binacional, Foz do Iguacu, PR (Brazil)]. E-mail: vergara@itaipu.gov.br

    1998-07-01

    This paper demonstrates the importance of the human resources good relationship, cooperation, understanding and training, for obtaining optimized results from the various interactions exiting among the operation and maintenance areas.

  18. Aplicación de la realidad virtual no inmersiva para Ingenieros Agrícolas

    Directory of Open Access Journals (Sweden)

    Reynolds León Guerra

    2012-01-01

    Full Text Available El presente trabajo aborda sobre la utilización de la realidad virtual no inmersiva en el campo de la ingeniería muy utilizado hoy en día por diferentes universidades y centros de investigación para el desarrollo de sus investigaciones y aplicación en la docencia, el trabajo se centra en el modo de uso de la realidad virtual por especialistas no informáticos que no tengan conocimientos de programación, donde se desarrolla una metodología que permite crear mundos virtuales sin la utilización de técnicas de programación y de fácil desarrollo ya que utilizan herramientas muy conocidas en el campo de los ingenieros como son los sistemas CAD/CAE aunque no se deja de mencionar aspectos importantes sobre Web y Vrml que son necesarios para una mejor compresión de la metodología elaborada y consideraciones especiales que debe tenerse en cuenta para crear mundos virtuales o escenas virtuales.

  19. Del territorio a la empresa: conocimientos productivos entre los ingenieros del norte de México

    Directory of Open Access Journals (Sweden)

    Alfredo Hualde Alfaro

    2001-01-01

    Full Text Available El crecimiento del empleo industrial con el aumento de la inversión extranjera ha producido un incremento de los mercados profesionales de ingenieros en las ciudades del norte de México. En los casos a los que el artículo se refiere, dicho crecimiento es mucho más importante en Tijuana que en Hermosillo. En una época de valoración creciente del conocimiento, la pericia y las competencias para el desarrollo local y regional, es necesario preguntarse por la naturaleza de dichos conocimientos, la forma de transmisión de los mismos y los actores e instituciones que intervienen en la producción y reproducción de los conocimientos productivos. El artículo toma el caso de las maquiladoras de Tijuana y de la empresa Ford de Hermosillo con el objetivo de reflexionar acerca de la forma en que dichos conocimientos constituyen (o no nexos de articulación entre las empresas y el territorio.

  20. El color y su significado en los documentos cartográficos del Cuerpo de Ingenieros Militares del siglo XVIII

    OpenAIRE

    Margarita San Andrés Moya; José Manuel de la Roja de la Roja

    2009-01-01

    Los Documentos Cartográficos del Cuerpo de Ingenieros Militares del s. XVIII y las fuentes documentales asociadas a su ejecución tienen un gran interés histórico, artístico y cultural. En este artículo se analizan las fuentes relacionadas con las técnicas, los materiales y sus formas de aplicación. Se describen los pigmentos y colorantes recogidos en los distintos tratados relacionados con este arte, especialmente los referidos a la técnica del lavado, en los que, además, se hace referencia a...

  1. Investigación y proceso: esencia de la formación de ingenieros químicos

    Directory of Open Access Journals (Sweden)

    Daniel Bogoya M.

    2011-01-01

    Full Text Available En este trabajo se plantea una metodología para la confección de un currículo de ingeniería química, partiendo de la concepción de un modelo de educación superior conducente a satisfacer combinadamente una demanda solvente y orientada, obediente e inmediatista, proveniente de los anhelos de producción de la industria química; la pretensión de un mejoramiento del medio de vida del profesional, que intenta un ascenso en todos los órdenes; los planes del Estado en materia de desarrollo industrial y económico, aún desarticulados entre sectores y en términos del tiempo; y el papel estratégico que la universidad debe jugar en una sociedad, dependiente también en el ámbito de la ingeniería química, donde se hace indispensable que los intelectuales asuman la responsabilidad de concebir y conducir con audacia los procesos de innovaeión que se requieren. Con base en este entorno se proponen como ejes centrales, para la formación de ingenieros químicos: la generación de una cultura investigativa que como actitud ante la vida forje un espíritu crítico, dispuesto a explorar otros caminos; y el dominio de las características que permitan entender un proceso químico y sus interacciones con la energía, la economía y el medio ambiente, donde interviene sistemáticamente un amplio conjunto de conceptos, posible de organizar de diferentes maneras y de sintetizar en un código fijo que se va actualizando permanentemente. Así, el primer eje tiene que ver fundamentalmente con la metodología y el segundo con los contenidos. La metodología propuesta implica archivar el paradigma de la "clase magistral", para pasar al del "seminario investigativo", ya usual en otras sociedades. Aquí se busca que cada educando protagonice su propia existencia y esculpa su propia estatua, en lugar de seguir única, callada y obedientemente la huella dejada por el docente. La organización de los contenidos implica una visión orgánica, para que cada

  2. The allocation of hydroelectric units in the short term planning of the operation of electrical power systems; La asignacion de unidades hidroelectricas en la planeacion de corto plazo de la operacion de los sistemas electricos de potencia

    Energy Technology Data Exchange (ETDEWEB)

    Ruiz Casillas, Manuel Eduardo

    1986-05-01

    A method is presented to find an approximated solution to the allocation problem of hydroelectric units. The problem consists in determining, for each one of the intervals the planned period, which hydroelectric units will be in operation and how much they will generate, so that the production cost of thermoelectric energy is minimum. The solution must satisfy certain operation policies, and restrictions of physical origin and safety. The modeling of the system elements is very detailed, for example, are considered: the not-linear dependency of the generating units with respect to the cost and the net height, the effects of the discharge level and the losses in conducts, and the relation volume storage against level in the dams. Mathematically, the problem is of non-linear programming, with continuous and discreet variables; in addition, if it is of large scale: in a real case, as de one that appears here, the problem has 16600 continuous variables, 8400 binary variables, and 51000 restrictions. The method exploits the problem structure and the modeled elements characteristics. It obtains a solution in reasonable computing time, and provides a lower elevation to the value of the optimal solution, which allows to judge the quality of the obtained solution. The algorithm was programmed for a VAX 11/780. Problems with a size as the one described are solved in 30 CPU minutes. The value of the obtained solutions, when 35% of the produced energy is hydroelectric, is typically 4% away from its respective inferior elevations. [Spanish] Se presenta un metodo para encontrar una solucion aproximada al problema de asignacion de unidades hidroelectricas. El problema consiste en determinar, para cada uno de los intervalos del periodo de planeacion, cuales unidades hidroelectricas estaran en operacion y cuanto generaran, para que el costo de produccion de energia termoelectrica sea minimo. La solucion debe satisfacer ciertas politicas de operacion y restricciones de origen fisico

  3. LABOR URBANÍSTICA Y DESARROLLO LOCAL DE LOS INGENIEROS MILITARES EN LA HABANA, CUBA. SIGLO XIX

    Directory of Open Access Journals (Sweden)

    María Victoria Zardoya Loureda

    2011-01-01

    Full Text Available La evolución arquitectónica y urbana de La Habana durante sus primeras centurias de existencia, estuvo condicionada en gran medida por la signifi cación de su puerto dentro de la táctica defensiva de carácter intercontinental que desplegó la corona española en sus dominios americanos. Desde fi nales del siglo XVIII y sobre todo, cuando Cuba y Puerto Rico quedaron como únicas colonias hispanas en América, el trabajo de los ingenieros militares se volcó hacia el interior del país, dirigido a una defensa de carácter diferente, destinada a aplacar las ansias independentistas criollas. Su quehacer entonces combinó los objetivos militares con acciones civiles que tuvieron una gran trascendencia urbana. El presente trabajo se centra en la labor de los ingenieros militares durante el siglo XIX, relacionada con el importante cambio de escala e imagen que transformó a la capital cubana a lo largo de esos años.

  4. "La ciencia de los ingenieros..." en la primera mitad del siglo XVIII

    Directory of Open Access Journals (Sweden)

    Galindo Díaz, Jorge

    2000-06-01

    que, para algunos autores, es el primer gran tratado de la ingeniería moderna: La Science des Ingénieurs, escrito por Bernard Forest de Belidor, francés de origen catalán y profesor de matemáticas en la Escuela de Artillería de La Fére, miembro de las sociedades científicas de Londres y Prusia y corresponsal de la Academia Real de Ciencias de París. Con este libro se presentaría un rotundo cambio de dirección en dos aspectos fundamentales de la cultura técnica de los ingenieros modernos: el dimensionamiento de la estructura a partir de procedimientos numéricos y la organización de los procesos de los trabajos de construcción. En las páginas siguientes daré cuenta de los contenidos de este tratado consultado en su versión original y en su particular traducción castellana, no sin antes hablar del papel que cumplió en la disociación de dos profesiones que hasta entonces habrían de compartir actitudes y competencias: arquitectura e ingeniería, tal como se entendían desde los ya distantes años del Renacimiento cuando la durabilidad, la estabilidad y la solidez de un edificio, cualquiera que él fuera, estaban precedidas por una ejecución perfecta, por el uso de los materiales adecuados, y donde el dimensionado de las partes obedecía a un plan general de las proporciones del conjunto, ... de un buscado equilibrio de los elementos. Veremos cómo -con la ciencia de los ingenieros del siglo XVIII-todos estos principios deberán explicarse, entonces, atendiendo a razones de naturaleza algebraica, en el conocimiento de la mecánica y en la comprensión abstracta de los elementos estructurales. Vale la pena señalar que este trabajo es parte de una investigación mucho más amplia sobre las transformaciones del conocimiento técnico en el campo de la ingeniería y la arquitectura entre los siglos XVI y XVIII, en Europa y en América, haciendo especial hincapié en el papel que juegan las escuelas y academias, a uno y otro lado del océano.

  5. An early work [1910-1913] in Biological Psychology by pioneer psychiatrist, criminologist and philosopher José Ingenieros, M.D. (1877-1925) of Buenos Aires.

    Science.gov (United States)

    Triarhou, Lazaros C; del Cerro, Manuel

    2006-04-01

    One of the earliest recorded works in Biological Psychology was published in 1910 by Argentine psychiatrist José Ingenieros (1877-1925), Professor of Experimental Psychology at the Faculty of Philosophy and Letters of the University of Buenos Aires. Ingenieros, a multifaceted personality and prolific author and educator famous for his lapidary aphorisms, has been considered a 'luminary' for generations. Trained as a physician, he was the first scientist to establish a comprehensive psychological system in Latin America. His long list of publications includes more than 300 titles generally divided in two periods: studies in mental pathology and criminology (1897-1908) and studies in philosophy, psychology and sociology (1908-1925). His works were never made particularly available to English-speaking audiences, despite the fact that certain of his books are still best-sellers in the Spanish-speaking world. We present an overview of Ingenieros' life and work, and a detailed account of his profoundly interesting work Principios de Psicología Biológica, in which he analyzes the development, evolution and social context of mental functions. We also provide an English translation of the Introduction contributed by Nobel laureate Wilhelm Ostwald (1853-1932) to the 1922 German edition of the work, pertinent to the energetic principles Ingenieros used and the study of Psychology as a natural science. It is a hope, 80 years after Ingenieros' parting, to bibliographically resurrect this champion of reason, who, until now, has not been given his due placement in the international psychological and biomedical literature.

  6. LA FORMACIÓN DE COMPETENCIAS CIENTÍFICO INVESTIGATIVAS PARA LA SOSTENIBILIDAD AMBIENTAL EN EL INGENIERO AGROPECUARIO

    Directory of Open Access Journals (Sweden)

    Fátima Solanda García Véliz

    2015-01-01

    Full Text Available El Ingeniero agropecuario en actuar profesional tiene gran incidencia en el desarrollo de las fuerzas productivas del país a la vez que se considera un actor indispensable para el manejo y cuidado del ambiente, con una alta contribución al logro de la sostenibilidad ambiental, esto hace que en su formación se desarrollen competencias que le permutan develar las problemáticas de la profesión y actuar en consecuencia. Aún en la sociedad se aprecia el elevado costo del desarrollo, la insuficiente valoración del impacto social en el dicho proceso, la incipiente cultura ambiental en cuanto a gestión participativa que encuentra su expresión en la insuficiente sensibilización humana sobre los problemas del ambiente y la escasa utilización de las elevadas potencialidades humanas para resarcir los efectos negativos sobre el ambiente. Por el desarrollo tecnológico alcanzado, las competencias científico investigativas son una de las de mayor incidencia para lograr la sostenibilidad ambiental. En consecuencia el cómo formar estas competencias en el Ingeniero agropecuario se convierte en una problemática a resolver. El trabajo aborda los elementos esenciales que fundamentan esta problemática y una propuesta para que este ingeniero adquiera estas competencias con responsabilidad.PALABRAS CLAVES: formación de competencias; competencias investigativas; agropecuaria; sostenibilidad.THE FORMATION OF SCIENTIFIC-INVESTIGATIVE COMPETITIONS FOR THE ENVIRONMENTAL SUSTAINABILITY IN THE AGRICULTURAL ENGINEERABSTRACTThe agricultural engineer professional performance has great influence on the development of the productive forces of the country at a time which is considered essential for the management and care of the environment, with a high contribution to achieving environmental sustainability actor, this means that in skills training that will reveal the problematic swapped the profession and act accordingly develop. Even in society the high cost of

  7. La física y la cultura de la profesión del ingeniero informático

    Directory of Open Access Journals (Sweden)

    Salvador Bacilio Barberán Feria

    2012-01-01

    Full Text Available Este artículo abordó la relación entre la Teoría de Maxwell para el electromagnetismo, tema de Física, y la asignatura Arquitectura de Computadoras, pues resulta fuente de cultura para la carrera de Ingeniería Informática. En este sentido se demostró la importancia de la ciencia Física en la formación inicial de este ingeniero, desde los principios físicos de la tecnología del funcionamiento de los periféricos de las máquinas computadoras, y su contribución a la formación ética profesional, lo que cobra una profunda connotación social. Se argumenta la tesis expuesta a partir del ejemplo de la fotocopiadora.

  8. La posición social de los ingenieros civiles: comparación entre dos escalas subjetivas y la incorporación de trayectorias laborales

    Directory of Open Access Journals (Sweden)

    Gabriela Bukstein

    2004-01-01

    Full Text Available Se efectuó una comparación entre dos escalas subjetivas: Standard international occupational prestige scale de Treiman (1977 y la Escala Argentina de Prestigio de las Ocupaciones de Acosta y Jorrat (1992 para establecer la posición social en cuanto a prestigio de un grupo profesional: los ingenieros civiles. Asumimos que todo individuo ocupa distintas posiciones dentro de contextos histórico-sociales cambiantes, por lo que deben tornarse en cuenta las ocupaciones desempeñadas a lo largo de su trayectoria laboral, como una posibilidad de conocer mejor la realidad. Se realizó una práctica exploratoria para discernir cómo se establece la posición social de los ingenieros civiles. Los resultados muestran que para alcanzar prestigio se requiere una trayectoria laboral organizada, pensada y planificada, donde influyen los ámbitos familiar y social.

  9. Formación encadenada de técnicos, tecnólogos e ingenieros en telecomunicaciones / Formation tied of technicians, technologists and engineers in telecommunication

    Directory of Open Access Journals (Sweden)

    Guillermo Echeverri Jiménez

    2007-01-01

    Full Text Available En la formación de técnicos, tecnólogos e ingenieros se ha diagnosticado lo siguiente: no existen encadenamientos entre estos niveles. La formación de técnicos, tecnólogos e ingenieros se confunde. Y existe un imaginario social: la formación técnica es para pobres. Esta situación afecta el desarrollo del país en dos sentidos: se ahonda el estado de dependencia tecnológica; se abre más la brecha socioeconómica, en tanto los técnicos no tienen un reconocimiento acorde con la importancia de su labor, o los ingenieros son mal remunerados por, supuestamente, hacer lo mismo que hace un técnico. Esta Propuesta es una alternativa de solución a la problemática planteada. Se propone un programa que articula la formación de técnicos, tecnólogos e ingenieros, desde una perspectiva integral, investigativa, flexible y por competencias.In the formation of technicians, technologists and engineers the following thing has been diagnosed: linking between these levels does not exist. The formation of technicians, technologists and engineers is confused. And a social one exists imaginary: the technical formation is for poor men. This situation affects the development of the country in two-way traffic: the state of technological dependency goes deep; he opens himself plus the socioeconomic breach, in as much the technicians they do not have an agreed recognition with the importance of his work, or the engineers badly are remunerated by, supposedly, doing just like a technician does.

  10. Impacto de las estancias profesionales en la formación del Ingeniero Químico

    Directory of Open Access Journals (Sweden)

    Maria Esther Aurora Contreras Lara Vega

    2015-05-01

    Full Text Available Este trabajo es el resultado de la evaluación de los reportes de las estancias profesionales de los estudiantes del Programa Educativo de Ingeniero Químico, de las generaciones 2001-06 a 2006- 2011, para identificar las principales funciones que desempeñan en sus estancias profesionales, las áreas donde se insertan y el sector que los contrata. La información recabada de las estancias profesionales es un indicador del grado de pertinencia del currículo del programa. Se determinó que 82 % de los alumnos se colocaron en industrias y áreas que tienen que ver con su perfil profesional de egreso; destacan las áreas de calidad, ingeniería aplicada y servicios, y la de seguridad, higiene y protección ambiental. Se identificó que los alumnos desempeñan principalmente actividades propias de su formación y se reconocieron áreas de oportunidad como la de mejorar las habilidades de comunicación oral y escrita y el manejo de equipos de laboratorio especializados

  11. El color y su significado en los documentos cartográficos del Cuerpo de Ingenieros Militares del siglo XVIII

    Directory of Open Access Journals (Sweden)

    Margarita San Andrés Moya

    2009-08-01

    Full Text Available Los Documentos Cartográficos del Cuerpo de Ingenieros Militares del s. XVIII y las fuentes documentales asociadas a su ejecución tienen un gran interés histórico, artístico y cultural. En este artículo se analizan las fuentes relacionadas con las técnicas, los materiales y sus formas de aplicación. Se describen los pigmentos y colorantes recogidos en los distintos tratados relacionados con este arte, especialmente los referidos a la técnica del lavado, en los que, además, se hace referencia a los códigos de color según el elemento representado, el orden o secuencia de trabajo y las mezclas de colores. Puesto que se trata de documentos que en aquella época tuvieron una función eminentemente práctica, en su ejecución se seguían unas pautas determinadas, que permitían normalizar su lectura e interpretación. Desde la perspectiva de la Conservación-Restauración, la documentación estudiada aporta una información significativa relacionada con los materiales sobre los que se intervienen, la detección de procesos de degradación y la autentificación de documentos.

  12. Pietro Antonio Tomasello de Padua : un ingeniero militar véneto en la Sicilia de Carlos V

    Directory of Open Access Journals (Sweden)

    Maurizio Vesco

    2011-01-01

    Full Text Available En 1522 el virrey de Sicilia, Ettore Pignatelli, conde de Monteleone, inició una gran campaña para fortalecer las defensas de las principales ciudades de la costa de Sicilia: Palermo, Trapani, Milazzo, Siracusa y, algunos años más tarde, incluso Messina. El ingeniero real Pietro Antonio Tomasello de Padua, un técnico militar Veneto, pidió renovar el sistema de defensas de la isla, con la introducción por primera vez de bastiones circulares y poligonales en fortalezas y murallas de la ciudad. La obra, desconocida hasta ahora, de este importante ingeniero militar activo en Sicilia desde 1523 hasta 1537, año de su muerte, está siendo reconstruida con una importante documentación de archivo. La investigación destaca líneas de continuidad en la estrategia de guerra de Carlos V, lanzada en Sicilia desde la época del virrey Conde de Monteleone. En consecuencia, se hace necesario revisar este extraordinario carácter general dado por los historiadores de la política militar de Ferrante Gonzaga. También hay que revisar la actualización y la autoría de muchas de las fortificaciones más importantes de Sicilia: el fuerte de San Salvador de Messina, anteriormente atribuido a Antonio Ferramolino de Bérgamo, las fortificaciones de defensa y escarpes del castillo de Milazzo y la torre circular de Castellammare de Palermo (estos últimos fechados en la segunda mitad del siglo XV, todas las obras son de Pietro Antonio Tomasello, realizadas en el segundo cuarto del siglo XVI.In 1522 the Viceroy of Sicily Ettore Pignatelli, Count of Monteleone, started a significant campaign for the strengthening of the outworks of the main cities located along the Sicilian coast: Palermo, Trapani, Milazzo, Siracusa and, after a few years, also Messina. The Royal Engineer Pietro Antonio Tomasello from Padua, a military technician from the Veneto region, was charged with renovating the island’s defensive system and introducing for the first time modern circular

  13. ALGUNAS CONSIDERACIONES EN LA FORMACIÓN DE LOS INGENIEROS PARA EL 2do DECENIO DEL 3er MILENIO.

    Directory of Open Access Journals (Sweden)

    Dester Perdomo Pérez

    2005-09-01

    Full Text Available A partir del análisis de la situación internacional, la del país y de los planes deestudio que hoy se aplican en cuba y otros países se definió.Establecer una carrera de amplio perfil para formar profesionales con unasólida formación básica, con habilidades para la solución de los problemas másgenerales y frecuentes de su profesión, que incluyan la apropiación del modode actuación profesional que caracteriza esta profesión y la diferencian deotras, que posea además un conjunto de habilidades profesionales generalesque le permitan alcanzar una formación integral cultural y educativa en elsentido más amplio de estos términos.En la elaboración y perfeccionamiento del nuevo plan de estudios para elIngeniero Mecánico cubano, que enfrentará las exigencias de los inicios delsiglo XXI, se ha tenido en consideración no solo la proyección nacional de estaprofesión, sino además, la situación que actualmente se plantea por lasinstituciones que marcan punta en el desarrollo de la misma, manteniendo losprincipios rectores de la educación cubana expresados en los planes deestudio anteriores.Tomando como elementos de referencia los aspectos anteriormente señaladosse definió un Cuerpo de Conocimientos de la Carrera de Ingeniería Mecánicapara poder comparar con los del plan de estudios vigente.

  14. Ingenieros del siglo XXI: importancia de la comunicación y de la formación estratégica en la doble esfera educativa y profesional del ingeniero

    Directory of Open Access Journals (Sweden)

    Martín, Ana M.ª

    2008-08-01

    Full Text Available The rise of worldwide communication networks and information technologies have redefined the concept of education in all fields. In engineering, a new educational paradigm can be glimpsed where the development of generic skills is prioritized in the curriculum and professional training of university students and practitioners. Skills such as the ability to successfully communicate orally and in writing, to operate with a multidisciplinary perspective in decision-making and problem-solving, to work in teams, and to become involved in lifelong learning, among others. The relationship among communication, training and lifelong learning is a key point in the profile of the engineer in this century. The challenge for those who are committed to the new paradigm, both teachers and trainers in the private sector, is to be able to incorporate the three dimensions into the educational process, so that it contributes to a better preparation of the individual to perform in the workplace from a human and professional point of view.El nacimiento de las redes mundiales de comunicación y las tecnologías de la información han redefinido el concepto de la educación en todos los ámbitos. En el terreno de la ingeniería se vislumbra un nuevo paradigma educativo donde se prioriza el desarrollo de destrezas genéricas, entre las que destacan la habilidad para comunicarse eficazmente de forma oral y escrita, para funcionar con una perspectiva multidisciplinar en la toma de decisiones y la resolución de problemas, el énfasis en el trabajo colaborativo y la capacidad para involucrarse en un aprendizaje de por vida. La interrelación entre comunicación, aprendizaje y formación es un factor fundamental en el perfil del ingeniero del nuevo siglo. El desafío para quienes nos hallamos comprometidos con este paradigma –tanto docentes como formadores en el sector privado– está en saber integrar estas tres dimensiones en el proceso educativo, de tal modo que

  15. La formación de competencias informacionales en el ingeniero industrial / Industrial engineer information literacy training

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    Alvarez, Juan Carlos

    2016-04-01

    Full Text Available El artículo describe las propiedades estadísticas de la información, su importancia para la toma de decisiones y la necesidad incluir la alfabetización informacional como parte del proceso de enseñanza aprendizaje en las universidades. El objetivo de la investigación fue proponer acciones que lograran integrar los procesos de solución de problemas docentes y la búsqueda, evaluación y recuperación de la información que requiere su solución. Se emplearon como métodos el análisis documental y la sistematización teórica para la construcción de los fundamentos conceptuales que se proponen, la modelación de su estructura y componentes. Finalmente se aplicó un pre-experimento pedagógico para evaluar la efectividad de la propuesta desde la formación del ingeniero industrial en la Universidad de Camagüey. El resultado esencial de la investigación estuvo en las acciones propuestas, como síntesis de la solución de problemas docentes y de información, que posibilitaron las transformaciones operadas en el comportamiento informacional de los estudiantes. ABSTRACT The article describes the characteristics of information, its importance for making of decisions and the need of including information literacy as a focus of the teaching-learning process at the university. The aim was to devise activities capable of integrating academic solving problem and locating, accessing and retrieving the information needed for their corresponding solution. A theoretical framework is constructed on the basis of documents analysis and systematizing methods, modeling was used to devise the activities describing their structure and components. Finally, an experiment was carried out to evaluate the effectiveness of the proposal in training industrial engineers at the University of Camagüey. The findings include a set of activities that combines problem-solving with information management which in terms lead to improving students’ ability and

  16. Ground failure in direct current systems of the Itaipu Hydroelectric Power Plant, Parana, Brazil. Impact in the operation; Falla a tierra en sistemas de corriente continua en la Central Hidroelectrica Itaipu, PR, Brasil. Impacto en la operacion

    Energy Technology Data Exchange (ETDEWEB)

    Soto Santacruz, Heriberto [Itaipu Binacional, Foz do Iguacu, PR (Brazil)]. E-mail: soto@itaipu.gov.py

    1998-07-01

    The objective of this work is to share with other companies the operation experience obtained by researching the direct current systems ground failure, in the Itaipu Hydroelectric Power Plant. During the research process electrical and/or electronic components can be damaged, and also human failures can occurred during the circuit connection and disconnection manoeuvres, necessary for the identification of the components causing the failures.

  17. Technological upgrade of static system excitation of a hydraulic generator of 700 Mwats of the Hydroelectric Power Station Guri; Actualizacion tecnologica del sistema de excitacion estatico de un generador hidraulico de 700 MVA de la Central Hidroelectrica de Guri

    Energy Technology Data Exchange (ETDEWEB)

    Contreras, Romy; Guevara, Olivia [C.V.G. Electrificacion del Caroni, C.A. (EDELCA) (Venezuela)

    2004-07-01

    The Generating Units of 700 Mwatts of the Guri Plant from EDELCA are equipped with static excitation systems of analogue technology that using the closure and field's opening switch as a mechanism for the respective processes of excitation and generator dropout. This operational pattern, although functional, has been discontinuing by existing producers because of the inconvenience involved in the management of energy stored in field generator during the dropout. Alternatively, the manufacturers employ a technique of dropout without opening the switch field, based on return to the excitation transformer the energy contained in the field generator. This paper summarizes the EDELCA initiative to upgrade technologically their Generating Units, converting the excitement and dropout switch without opening the field. The project started with a phase of preliminary tests that showed the feasibility of the change and ended with the final implementation of the new scheme in a first unit (Generator n. 15). The results were successful, covering the expectations of the company, so it was decided to continue the project, extending it to the rest of the Generating Units. (author)

  18. Cristina Beatriz Fernández, José Ingenieros y las escrituras de vida. Del caso clínico a la biografía ejemplar : Mar del Plata, Eudem, 2014, 149 páginas

    OpenAIRE

    Hermida, Carola

    2015-01-01

    Este nuevo libro de Cristina B. Fernández se origina en su tesis de doctorado, referida a las relaciones entre literatura y ciencia en la producción de José Ingenieros. Sin embargo, como aclara la autora en las primeras páginas, se trata de una reescritura que se ha enriquecido con los avances de su investigación, testimoniados en sus últimas publicaciones: José Ingenieros y los saberes modernos y Hojas al pasar: las crónicas europeas de José Ingenieros, ambos de 2012. Asimismo, su actual int...

  19. Zonación ingeniero geológica de peligrosidad y riesgo por inundación del territorio de Sagua de Tánamo

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    Rafael Guardado-Lacaba

    2006-03-01

    Full Text Available Se realiza una zonación ingeniero geológica de peligrosidad y riesgos por inundación en el territorio de Sagua de Tánamo, mediante el análisis e interpretación de las principales condiciones y causas condicionantes del medio físico que propician el desarrollo de este fenómeno, con el empleo de las técnicas de cartografía digital y SIG. El método adoptado, a diferencia de los métodos de trabajos tradicionales de cartografía ingeniero – geológica y la confección de proyectos SIG, plantea la  solución del problema a partir de  la conjugación de ambos, considerando entre los métodos y técnicas de representación cartográfica digital la informatización a partir del trabajo con mapas bases y superposición de sus capas. Se obtuvo el mapa de  riesgos por inundación como expresión de la influencia de las condiciones naturales e hidrometeorológicas imperantes.  Indicaciones metodológicas para la elección del método de arranque de las rocas durante el laboreo de excavaciones subterráneas horizontales de pequeña y mediana sección en Cuba Oriental

  20. Visión panorámica actual del Ingeniero de Planta en el proceso de fabricación del cennento

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    Castilo Neyra, Percy B. R.

    1984-06-01

    Full Text Available The energy crisis and subsequent retraction of sales on the market have demanded a greater exigency in the productive aspect of cement, requiring lower production costs and making the quality of the product more appropriate to the nature of its use in construction. This article focuses on the perspectives which should be considered by the Plant Engineer in order to achieve these objectives. The importance and necessity of projecting the process to the characteristics of the end product are stressed, as well as the usefulness of an adequate knowledge of the raw materials. Other factors which could also be considered as work tools of the Plant Engineer are mentioned, always taking into consideration, however, the fact that their best use will basically depend on the criterion with which they are put to use, since each factory constitutes a different world of its own.

    La crisis energética y la subsecuente retracción de ventas en el mercado han demandado una mayor exigencia en el aspecto productivo del cemento, requiriéndose menores costos de producción y una mejor adecuación de la calidad del producto a las características de su empleo en obra. En este artículo se enfoca las perspectivas que debe considerar el Ingeniero de Planta para el logro de estos objetivos. Se destaca la importancia y necesidad de la proyección del proceso a las características del producto final, así como la utilidad de un conocimiento adecuado de las materias primas. Se mencionan otros factores que podrían considerarse igualmente como herramientas de trabajo para el Ingeniero de Planta, pero siempre bajo la consideración de que su mejor utilización dependerá fundamentalmente del criterio con que sean empleadas, por constituir cada fábrica un mundo diferente y particular.

  1. Vínculo lenguaje-contexto y su importancia para la comunicación del futuro ingeniero // The relatonship between language and context and its importance for the communication of the future engineer

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    Ada Caridad Cabrera - González

    2010-09-01

    Full Text Available El objetivo central que persigue el sistema educacional cubano es la formación de profesionalesintegrales. En esto, sin lugar a dudas, está implícito el propósito de lograr que sean además,competentes en el uso del lenguaje para que puedan satisfacer las exigencias, no solo del modelodel profesional diseñado para cada carrera de ciencias técnicas sino además, las del contexto dondese desenvuelven. El objetivo de este artículo, es demostrar el vínculo lenguaje-contexto y cómo através de este se puede favorecer la comunicación, a partir de considerar al lenguaje como mediadoresencial en los procesos de construcción de conocimientos en situaciones interactivas. Se utilizaronmétodos del nivel teórico y empírico que permitieron abordar el objeto de estudio y aproximarlo a lasposiciones actuales que tratan acerca de este particular. Como resultado de este trabajo se ofrecenalgunos ejemplos que evidencian que el uso que se hace del lenguaje está relacionado con elcontexto de comunicación y que en la medida en que el estudiante sepa operar con el lenguajecientífico-técnico podrá desarrollar determinadas habilidades que favorecerán su desempeñoprofesional presente y futuro.Palabras claves: comunicación, contexto, ingeniero, lenguaje._________________________________________________________________________AbstractThe main objective followed by the Cuban educational system is the formation of whole professionals.The purpose to achieve competent professionals in the use of the language to meet the demands notonly from the professional model designed for each career of technical science but also the ones fromthe context where they develop is implicit. The objective of this article is to show the language-contextbond and how it can favour communication, considering language as an essential mediator in theconstruction processes of knowledge in interactive situations. Methods from a theoretical andempirical level were used. They allowed

  2. La ingeniería legal en la formación del ingeniero y la contratación estatal en ingeniería

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    Fernando Guzmán Castro

    2011-02-01

    Full Text Available En la Facultad de Ingeniería de la Universidad Nacional de Colombia, sede Bogotá, se ha ofrecido desde hace mucho tiempo la asignatura Ingeniería Legal, que conceptualiza los puntos de convergencia entre el ejercicio de la ingeniería y los aspectos legales vigentes en el país. Inicialmente el ilustre ingeniero Alfredo Bateman, y más adelante los autores del artículo han dirigido el curso que se ha dictado para todas las especialidades de ingeniería. Al comienzo del presente artículo se describen los conceptos de la ingeniería legal, agrupándolos en subtemas: la legislación laboral, las actividades mercantiles y el régimen de sociedades, la propiedad y la legislación fiscal, la contratación en ingeniería, la legislación ambiental y la reglamentación de la profesión de ingeniería. En una segunda parte se profundiza en uno de los temas, la contratación en ingeniería, describiendo los tipos de contratos y las condiciones de contratación vigentes en la legislación colombiana.

  3. Educational software tool for protection system engineers: distance relay; Herramienta educativa para la formacion de ingenieros en protecciones electricas: relevador de distancia

    Energy Technology Data Exchange (ETDEWEB)

    Trujillo-Guajardo, L.A.; Conde-Enriquez, A. [Universidad Autonoma de Nuevo Leon, Nuevo Leon (Mexico)]. E-mail: luistrujillo84@gmail.com; con_de@yahoo.com

    2012-04-15

    In this article, a graphical software tool is presented; this tool is based on the education of protection system engineers. The theoretical fundaments used for the design of operation characteristics of distance relays and their algorithms are presented. The software allows the evaluation and analysis of real time events or simulated ones of every stage of design of the distance relay. Some example cases are presented to illustrate the activities that could be done with the graphical software tool developed. [Spanish] En este articulo se presenta una herramienta computacional grafica para apoyar la formacion de ingenieros en protecciones electricas. Los fundamentos teoricos para el diseno de caracteristicas de operacion de relevadores de distancia, asi como las rutinas de programacion de un relevador de distancia son presentados. La herramienta desarrollada permite la evaluacion de las etapas de diseno de relevadores y el analisis de la operacion ante eventos reales o simulados. Se presentan algunos casos de ejemplo para ilustrar las actividades didacticas que son posibles de realizar con la herramienta presentada.

  4. El ingeniero Calvi y la concepción de la Nueva Rhode : historia, arqueología e ingeniería militar en la Rosas Renancentistas

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    Pablo de la Fuente

    2001-01-01

    Full Text Available Juan Bautista Calvi, ingeniero italiano al servicio de Carlos V y Felipe II fue el diseñador de la moderna plaza fuerte de Rosas y pionero del conocimiento arqueológico de Rhode, su precedente urbano, una antigua colonia griega. La historia como lección práctica fue una herramienta utilizada por Calvi: su idea relativa a Rhode y su historia condicionó algunos aspectos de su proyecto, y la utilizó como argumento contra otros proyectos. Hoy en día, los hallazgos de Calvi nos permiten completar una visión entendedora de lo que fue la antigua RhodeGiovanni Battista Calvi, Italian engineer who served the emperor Charles V and his son Philip II, was who designed the modern fortification of Rosas in Catatonía and the pioneer of the archaeological knowledge of Rhode, urban precedent of this city an ancient Greek settiement. History as practical lesson was a kind of tool used by Calvi: his concept about the ancient Rhode and its history conditioned same aspects of his project, and he used it as an argument against other projects. Nowadays, Calvi's archaeological discoveries allows us to complete an understanding view of the evolution of Rhode.

  5. COMPRENSIÓN DE LAS DISTRIBUCIONES MUESTRALES EN UN CURSO DE ESTADÍSTICA PARA INGENIEROS UNDERSTANDING OF SAMPLE DISTRIBUTIONS FOR A COURSE ON STATISTICS FOR ENGINEERS

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    Lidia Retamal P

    2007-04-01

    Full Text Available Se describe una propuesta didáctica de enseñanza contextualizada y con uso del programa @risk de las distribuciones muestrales en el aula de estadística para ingenieros de segundo año universitario. Apropiándonos de la teoría de las funciones semióticas, desarrollada en la Universidad de Granada-España, caracterizamos los elementos de significados de las propiedades importantes de las distribuciones muestrales y evaluamos, mediante campos de problemas algebraicos y de simulación, los errores o dificultades que los alumnos ponen de manifiesto en las aplicaciones de simulación de procesos en las ciencias de la ingeniería. Como consecuencia, al considerar los elementos de significados adquiridos en las respuestas de los estudiantes, proponemos la simulación para muestras pequeñas y grandes de forma intuitiva, como primer acercamiento del alumno hacia la construcción del significado de las distribuciones muestrales, usando el lenguaje gráfico con apoyo del computador, para posteriormente analizar con los estudiantes su forma algebraica según la naturaleza de las variables aleatorias Se describe una propuesta didáctica de enseñanza contextualizada y con uso del programa @risk de las distribuciones muestrales en el aula de estadística para ingenieros de segundo año universitario. Apropiándonos de la teoría de las funciones semióticas, desarrollada en la Universidad de Granada-España, caracterizamos los elementos de significados de las propiedades importantes de las distribuciones muestrales y evaluamos, mediante campos de problemas algebraicos y de simulación, los errores o dificultades que los alumnos ponen de manifiesto en las aplicaciones de simulación de procesos en las ciencias de la ingeniería. Como consecuencia, al considerar los elementos de significados adquiridos en las respuestas de los estudiantes, proponemos la simulación para muestras pequeñas y grandes de forma intuitiva, como primer acercamiento del alumno

  6. Caracterización ingeniero geológica del perfil de meteorización de rocas ultrabásicas serpentinizadas en el territorio de Moa, Cuba

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    Rafael Guardado-Lacaba

    2005-03-01

    Full Text Available Las cortezas de meteorización desarrollada sobre rocas ultrabásicas serpentinizadas en la región de Moa han sido ampliamente caracterizadas desde el punto de vista mineralógico y geoquímico, no siendo así respecto a su comportamiento ingeniero geológico, el cual constituye un elemento fundamental para emprender cualquier evaluación de riesgos asociados a movimientos de masas. La presente investigación abarcó las cortezas de tipo residual sobre las cuales se aplicaron los métodos geomecánicos tradicionalmente utilizados para caracterizar el comportamiento ingeniero geológico de un macizo. Se realizó la descripción visual de los diferentes horizontes lateríticos, y se aplicaron índices relacionados con las propiedades físico- mecánicas, estructurales y texturales tales como el índice de microfractura y micropetrográfico, índice de calidad del macizo rocoso (RQD e índice de alteración unificado. Como resultado se presenta una propuesta de clasificación ingeniero geológica del perfil en función del grado de meteorización, el cuál se definió en una escala de I a V a partir de los valores típicos de las propiedades físico mecánicas, RQD, relación porcentual roca/suelo y otros dos elementos relacionados con el modo de rotura de taludes y laderas y la tipología de deslizamiento

  7. Caracterización ingeniero geológica del perfil de meteorización de rocas ultrabásicas serpentinizadas en el territorio de Moa, Cuba

    OpenAIRE

    Rafael Guardado-Lacaba; Yuri Almaguer-Carmenate

    2005-01-01

    Las cortezas de meteorización desarrollada sobre rocas ultrabásicas serpentinizadas en la región de Moa han sido ampliamente caracterizadas desde el punto de vista mineralógico y geoquímico, no siendo así respecto a su comportamiento ingeniero geológico, el cual constituye un elemento fundamental para emprender cualquier evaluación de riesgos asociados a movimientos de masas. La presente investigación abarcó las cortezas de tipo residual sobre las cuales se aplicaron los métodos geomecánicos ...

  8. Aplicación de Herramientas Multimedia al Dibujo Electrónico y su Normalización, en los Nuevos Planes de Estudio de Ingeniero Técnico Industrial

    OpenAIRE

    2003-01-01

    El objeto de la ponencia presentada es el de compartir la experiencia llevada a cabo en la nueva titulación de Ingeniero Técnico Industrial en Electrónica (plan 2001), mediante la introducción de nuevas herramientas TIC aplicadas a las asignaturas del Área de Expresión Gráfica. Las herramientas en concreto constituyen un entorno profesional en electrónica y serán utilizadas en una práctica o trabajo final de dibujo electrónico.

  9. La formación de ingenieros de la edificación en empresas constructoras en la comunidad autónoma de Castilla-La Mancha. Su influencia en la satisfacción laboral

    OpenAIRE

    Fuentes-del-Burgo, Joaquín; Navarro-Astor, Elena

    2013-01-01

    Objeto: El objetivo de la investigación es indagar en las actividades formativas que desarrollan empresas constructoras en Castilla-La Mancha, con los ingenieros de edificación/arquitectos técnicos que trabajan como jefes de obra y su efecto sobre la satisfacción laboral. Diseño/metodología: Se realizaron 34 entrevistas semi-estructuradas. Mediante el empleo de metodología cualitativa, el contenido de las entrevistas se analizó utilizando el programa ATLAS.ti. Aportaciones y resultado...

  10. La implantación del sistema ECTS en el ámbito de los planes de estudio vigentes. Experiencia para primer curso de Ingeniero Técnico en Informática de Sistemas de la UCO

    OpenAIRE

    Salas-Morera, Lorenzo

    2004-01-01

    En el presente trabajo se resume la situación actual del proceso de convergencia europea y se explica la metodología seguida para la adaptación al ECTS de las asignaturas correspondientes a primer curso de Ingeniero Técnico de Informática de Sistemas dentro de los Planes de Estudios de 1999. El proceso culmina con la generación de las guías docentes de todas las materias y se encuentra actualmente en implantación experimental.

  11. First results of connected parabolic collector to the grid with Stirling motor in the Seville Engineering School; Primeros resultados de la conexion a red de un disco parabolico con motor stirling, en la escuela superior de ingenieros de Sevilla

    Energy Technology Data Exchange (ETDEWEB)

    Silva Perez, M. A.; Lilio Bravo, I.; Ruiz Hernandez, V.; Larraneta Gomez-Caminero, C.

    2004-07-01

    A Parabolic Dish System has been installed and is operating since March 2004 at the Seville Engineering School (Escuela Superior de Ingenieros). The system is integrated in a wider project, called EnviroDish, that includes the installation of several units in different countries with the aim to gather reliable data on system performance and installation and O and M costs. The system is connected to the grid and the electricity generated is sold to the regional utility with the benefits of the Special Regime. In the present paper we describe the installation and present an advance of the firs operating results. (Author)

  12. Escuela Técnica Superior de Ingenieros de Caminos, Canales y Puertos, en Madrid, España

    Directory of Open Access Journals (Sweden)

    Laorga, L.

    1969-05-01

    Full Text Available The project was awarded the first price at a competition initiated in 1963, and it is based on the universally established practice regarding careful and strict dimensioning, uniform illumination, transversal ventilation, low ceilings, maximum concentration and short circulation distances, as well as coordinated organization of the various nuclei and functions, and centralization of the relaxation zones. The actual building has been carefully constructed, with long lasting materials requiring little maintenance, such as unfaced concrete and anodized aluminium.El proyecto fue el primer premio de un concurso convocado para este fin en 1963 y está resuelto teniendo en cuenta las normas universalmente aceptadas de: dimensionamiento correcto y ajustado, iluminación uniforme, aireación transversal, reducción de plantas, concentración máxima y circulaciones cortas, organización jerárquica de los diferentes núcleos y funciones, centralización de las áreas de relajación respecto de sus correspondientes grupos... El edificio ha sido el resultado de una construcción cuidada y en la cual se han utilizado, fundamentalmente, materiales duraderos y de fácil conservación, tales como el hormigón visto y el aluminio anodizado.

  13. Departamento de ingenieros de la construcción. Escuela Técnica Superior de Aquisgrán

    Directory of Open Access Journals (Sweden)

    Rosskotten, Heinrich

    1964-12-01

    Full Text Available The main nucleus of this project consists of an eight storey building, housing 9 main lecture rooms, 2 smaller ones, and drawing classrooms. Attached to it, running in a westerly direction, another building has two large lecture halls, each with seating capacity for 200 students. Finally, the Institute blocks accommodate the following: statics, construction, roads, construction machinery, soil mechanics and town planning departments. All these are connected with the main building by means of three bridges. The various buildings are planned in a highly organic manner: this avoids architectural monotony, and tends, on the contrary, to convey an impression of dynamic harmony.El núcleo central del complejo está constituido por un edificio de ocho plantas, que alberga las dependencias correspondientes a nueve cátedras, dos aulas pequeñas y salas de dibujo. En conexión con el mismo —en dirección E—, otro de los edificios contiene dos grandes aulas con capacidad para 200 estudiantes cada una. Y finalmente los bloques de los Institutos, que albergan las siguientes naves: de Estática, de Construcción, de Carreteras, de Maquinaria de Construcción, así como la de Mecánica del Suelo y Urbanización, todas comunicadas con el edificio principal a través de tres puentes. La disposición orgánica de las distintas construcciones, no solamente evita la monotonía en la composición arquitectónica, sino que une todas las edificaciones en un conjunto armónico.

  14. La mecánica ilustrada en los ingenieros militares españoles. El proyecto de los almacenes de pólvora (1715-1798

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    Lluis i Ginovart, J.

    2015-09-01

    Full Text Available The catenary arches were part of the great structural success of the modernist architecture, and especially in the Gaudí’s work. The study of the Spanish military engineers’ projects shows that they were the first that introduced in the Spanish territory in the first third of the eighteenth century. Knowledge and the attempt to apply this type of structure, especially in the construction of Powder-Magazines, will demonstrate the knowledge of the scientific theory of these structures made by Hooke. The study of pre-scientific Mechanics was claimed by Juan de Herrera in the Academy of Mathematics (1583, as it is scientific Mechanics at the Academy of Barcelona (1720. For this reason and due to the use of catenary arch and vault, this will show that they provided the bases of modern mechanic.Los arcos catenarios formaron parte del gran éxito estructural de la arquitectura modernista y, especialmente, de la obra de Gaudí. El estudio de los proyectos de los ingenieros militares españoles, demuestra que fueron ellos los primeros que los introdujeron en el territorio español en el primer tercio del siglo XVIII. El conocimiento y el intento de aplicación de este tipo de estructuras, especialmente en la construcción de polvorines, demostraría el conocimiento de la teoría científica de estas estructuras formulada por Hooke. El estudio de la Mecánica pre-científica fue reclamado por Juan de Herrera en la Academia de Matemáticas (1583, al igual que lo será la Mecánica científica en la Academia de Barcelona (1720. Por ello y ante la utilización del arco y bóveda catenaria, se demostraría también que aportaron las bases de la Mecánica moderna.

  15. EL DESARROLLO SUSTENTABLE, LA DEPENDENCIA ENERGÉTICA Y LAS NUEVAS COMPETENCIAS DEL INGENIERO ELECTRICISTA SUSTAINABLE // DEVELOPMENT, ENERGY DEPENDENCE AND THE NEW PROFILE ELECTRICAL ENGINEER

    Directory of Open Access Journals (Sweden)

    Carmen Vásquez

    2011-06-01

    Full Text Available Resumen La ingeniería se considera como el arte, la tecnología o la profesión que busca la transformación de los recursos naturales en beneficio de la sociedad, de allí que la actuación profesional del ingeniero debe incluir habilidades, destrezas y hábitos que le permitan ir acorde con el avance tecnológico. Sin embargo se observa que en la medida que aparecen los avances científicos y tecnológicos se han generado problemas al medioambiente y al bienestar social, en general. El ritmo cambiante de la sociedad actual y su entorno demanda que los programas universitarios, en este caso el de Ingeniería, se adapten rápidamente a las necesidades de la sociedad, todo enmarcado en la sustentabilidad. En particular la Ingeniería Eléctrica, como profesionales encargados de atender de manera general a los sistemas eléctricos, el marco del desarrollo sustentable y la dependencia energética, desarrollar nuevas competencias con alta sensibilidad ambiental y social y criterios de eficiencia, que le permitan minimizar el efecto de estos sistemas al ambiente y garantizar el bienestar de las generaciones futuras. En este sentido, el presente trabajo tiene como propósito resaltar la importancia de esta profesión y su relación con el futuro deseable, incluyendo una disertación sobre el desarrollo sustentable y el bienestar social que está en juego y las nuevas competencias de estos profesionales.// ABSTRACT: The engineering is considered as art, technology or the profession that seeks the transformation of natural resources for the benefit of society, hence the performance of the engineer must include skill, abilities and habits that enable them to go with technological advancement. However we notice that the measure displayed the scientific and technological advances have created problems for the environment and social welfare in general. The changing pace of the modern society and its environment, demands that university, in the case

  16. De la pacificación al desarrollo sostenible. Discurso del Señor Presidente de Costa Rica, Ingeniero José María Figueres, en la Apertura de la XV reunión de presidentes centroamericanos.

    OpenAIRE

    Figueres, José María

    2016-01-01

    De la pacificación al desarrollo sostenible. Discurso del Señor Presidente de Costa Rica, Ingeniero José María Figueres, en la Apertura de la XV reunión de presidentes centroamericanos. Guácimo, Costa Rica, 20 de agosto de 1994

  17. Diagnóstico ambiental preliminar de la Central Termoeléctrica de Paipa

    Directory of Open Access Journals (Sweden)

    Carlos Magno Martínez Mora

    2010-12-01

    Full Text Available Este trabajo, realizado por el Ingeniero Carlos M. Martínez Mora, como uno de los requisitos para optar al título de Magister Scientiae en Ingeniería ambiental y dirigido por el ingeniero Jorge Ricardo Bernal, tuvo como objetivo analizar las condiciones actuales de operación de la Central Termoeléctrica de Paipa y establecer las bases para la preparación del expediente ambiental exigido por el Código de los Recursos Naturales Renovables y de Protección al Medio Ambiente. Se estableció que en el momento operan tres unidades de generación de 33, 66 Y 74 megavatios. Se utiliza el agua del río Chicamocha, para condensación y transferencia de calor hacia el ambiente. El combustible utilizado es carbón mineral, cuyas emisiones contaminadoras son cenizas y óxidos de azufre. Se llevó a cabo un programa de muestreo de calidad del agua y se hizo un estimativo de calidad del aire, mediante la aplicación de un modelo de dispersión. Definido el estado actual o de referencia, se realizó un análisis de los efectos predecibles que podría causar sobre la calidad ambiental, la instalación de una cuarta unidad generadora de 150 megavatios. Se hacen varias recomendaciones tendientes a minimizar tales posibles efectos negativos.

  18. Análisis de las discrepancias económicas entre Swanston y Cia, constructora del Puerto de la Luz (Canarias, y su ingeniero Juan de León y Castillo

    Directory of Open Access Journals (Sweden)

    Mercedes Calvo Cruz

    2009-12-01

    Full Text Available En este trabajo pretendemos abordar la figura de Juan de León y Castillo, persona ilustre en su época, científico, ingeniero y apasionado por la política y la filosofía, desde una óptica novedosa, toda vez, que se pretende poner de manifiesto la estrecha relación que existió entre el ingeniero y la Swanston and Company, contratista que llevó a cabo la construcción del Puerto de Refugio de la Luz de Las Palmas. Esta relación data de 1891, momento en el que se firma el contrato entre ambos y Juan de León y Castillo se hace cargo de las obras del puerto como Ingeniero Director y Consultivo.Es nuestro objetivo evidenciar los entresijos económicos y los numerosos problemas que existieron entre el ingeniero y la empresa contratista y poner de manifiesto una desconocida faceta de Juan de León y Castillo como censor de los libros contables y demás documentación económica que la Swanston llevaba para la obra que nos ocupa.Por tanto, con este trabajo quisiéramos contribuir al conocimiento de un hombre ilustre y polifacético, que no sólo se dedicó a la estricta labor de desarrollar aquellos conocimientos recibidos sino que denota la curiosidad propia de un investigador y la ecuanimidad en su proceder.In this work we try to approach Juan de León y Castillo's figure, an illustrious person of his time, scientist, engineer and an enthusiast about politics and philosophy. From a new optic, he tried to reveal the narrow relation that existed between the engineer and the Swanston and Company, contractor who carried out the construction of El Puerto de Refugio de la Luz de Las Palmas. This relation dates back on the late 1891, moment in which the contract is signed between both and Juan de León y Castillo takes charge of the works of the port as an engineer, director and advisor.It is our aim to demonstrate the economic mesenteries and the numerous problems which existed between the engineer and the company contractor and to reveal an

  19. Análisis de cambios de uso del suelo en la Delegación Municipal de Ingeniero White (Buenos Aires, Argentina: aplicación de geotecnologías

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    Andrea Marcela Silva Schweitzer

    2014-01-01

    Full Text Available La Delegación Municipal de Ingeniero White se encuentra en la provincia de Buenos Aires, Argentina. Este trabajo analiza la dinámica de cambio de uso del suelo en el área mencionada durante el periodo 1967-2012. La metodología empleada se basa, por un lado, en el desarrollo del proceso cartográfico necesario para la identificación de los usos del suelo a escala 1:50.000 para ambos años y, por otro, en la aplicación del método de tabulación cruzada en un entorno SIG con el fin de evaluar los cambios ocurridos en el lapso de 45 años. Los resultados muestran un importante crecimiento del uso residencial y poca variación en el resto de los usos.

  20. El modelo del profesional y el curriculum en la formación del ingeniero del siglo XXI // The model of the professional and the curriculum in the education of the engineer of the century XXI

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    Dester Perdomo Pérez

    1998-01-01

    Full Text Available Si bien es cierto que los cambios que han ocurrido en la ciencia y la tecnología en las últimas décadas han tenido una influenciaimportante en todas las carreras de la ingeniería, los cambios que aún manifiestan los curriculum para la mayoría de lasuniversidades del mundo que se dedican a la formación de ingenieros, no han cambiado de la misma forma, esto en algunasopiniones se debe a que los contenidos de las Ciencias Naturales, las Matemáticas y las propias Ciencias de la Ingeniería,mantienen en lo fundamental contenidos semejantes, pero, es necesario detenerse a analizar como ha cambiado el puesto detrabajo de los ingenieros en los últimos años y como se puede predecir debe cambiar según las perspectivas que anuncia elparadigma de la primera década del siglo XXI. En estos momentos se plantean a los ingenieros, niveles de exigencia superioresen su gestión, soluciones más rápidas, con mayores niveles de fiabilidad y como se dice en las nuevas concepciones de calidadque no solo logren satisfacer las expectativas del usuario, sino que también lo hagan sentir contentos de la inversión querealizó.Estos elementos entre otros aspectos que se analizan hacen necesario montar carreras de ingeniería sobre sistemascomputacionales y no como se pensaba hace unos años, en solo la necesidad de incluir en los curriculum una o dos asignaturasrelacionadas con las técnicas de computo.____________________________________________________________________AbstractEven though it is certain that the occurred changes in the science and technology in the last decades have had an importantinfluence in all engineering careers, the changes that yet express the curriculum for most of the universities in the worlddevoted to the engineers training, they have not changed in the same way, this in some opinions is due to the contents of theNatural Sciences, Mathematics and the own Sciences of the Engineering, maintain the essential contained very similar, but

  1. El Modelamiento Matemático Como Vía Idónea Para La Formación De Ingenieros. Una Reflexión Pedagógica

    Directory of Open Access Journals (Sweden)

    Jhon J. Leal

    2015-01-01

    Full Text Available El quehacer de los ingenieros consiste en modelar situaciones particulares en campos específicos de su saber, definir sistemas y variables de interés,  diseñar o utilizar modelos matemáticos que relacionen las variables seleccionadas como relevantes, estudiar distintas alternativas para la solución de modelos bien se analítica o numéricamente, predefine márgenes de error para poder comparar tales soluciones con las obtenidas por sistemas computacionales especializados diseñados para tal fin, finalmente comparan las soluciones con resultados experimentales y reformulan los modelos para minimizar sus errores. En el proyecto “Diseño y evaluación de una estrategia didáctica para resolver problemas de  ingeniería utilizando modelamiento matemático y ecuaciones diferenciales ordinarias”, los estudiantes de ingeniería de la Universidad Cooperativa de Colombia, formularon y resolvieron modelos matemáticos para situaciones particulares aproximándose al ejercicio real de su práctica profesional.

  2. Deployable centralizers

    Energy Technology Data Exchange (ETDEWEB)

    Grubelich, Mark C.; Su, Jiann-Cherng; Knudsen, Steven D.

    2017-02-28

    A centralizer assembly is disclosed that allows for the assembly to be deployed in-situ. The centralizer assembly includes flexible members that can be extended into the well bore in situ by the initiation of a gas generating device. The centralizer assembly can support a large load carrying capability compared to a traditional bow spring with little or no installation drag. Additionally, larger displacements can be produced to centralize an extremely deviated casing.

  3. La formación de ingenieros de la edificación en empresas constructoras en la comunidad autónoma de Castilla-La Mancha. Su influencia en la satisfacción laboral

    Directory of Open Access Journals (Sweden)

    Elena Navarro-Astor

    2013-09-01

    Full Text Available Objeto: El objetivo de la investigación es indagar en las actividades formativas que desarrollan empresas constructoras en Castilla-La Mancha, con los ingenieros de edificación/arquitectos técnicos que trabajan como jefes de obra y su efecto sobre la satisfacción laboral. Diseño/metodología: Se realizaron 34 entrevistas semi-estructuradas. Mediante el empleo de metodología cualitativa, el contenido de las entrevistas se analizó utilizando el programa ATLAS.ti. Aportaciones y resultados: Salvo una gran empresa, no existe una planificación de la formación que responda completamente a las necesidades de estos profesionales. Existe una formación introductoria en los sistemas de gestión de la empresa (cuando los hay, y la obligatoria por ley en prevención de riesgos laborales. Adicionalmente, la mayoría de los ingenieros realizan actividades de formación propias, con el fin de actualizar o aumentar conocimientos, o para mejorar en el puesto de trabajo. Han aparecido una serie de barreras que dificultan la existencia y los efectos que podría tener la formación sobre las personas que la realizan. Finalmente, el efecto de la formación sobre la satisfacción laboral suele ser positivo, con mayor intensidad en aquellos casos en los que la formación ayuda a mejorar el desempeño en el puesto de trabajo. Implicaciones prácticas: Los resultados podrían ayudar a las empresas constructoras a definir un programa de formación que cumpla adecuadamente los objetivos de esta práctica esencial en el desarrollo de los recursos humanos. Valor añadido: Se cubre un vacío existente en la literatura sobre la dirección y gestión de recursos humanos en el Sector de la Construcción en España. El estudio aporta la visión que los ingenieros de edificación/arquitectos técnicos tienen sobre la formación y sus efectos.Purpose: This paper explores training activities for building engineers, working as site managers, carried out by construction

  4. El Cuerpo de Ingenieros Militares y la Real Junta de Fomento de la isla de Cuba. Obras públicas entre 1832 y 1854 = Spanish Military Engineers and the Real Junta de Fomento at the Island of Cuba. Public Works between 1832 and 1834

    Directory of Open Access Journals (Sweden)

    Ignacio José López Hernández

    2016-05-01

    Full Text Available Con este trabajo se pretende abordar la tarea desempeñada por los ingenieros del ejército en las obras públicas de la isla de Cuba como cuerpo facultativo y asistente de la Real Junta de Fomento, corporación encargada entre los años de 1832 y 1854 de articular las infraestructuras y medios necesarios para la promoción de la agricultura y el comercio. Para ello estudiaremos la particularidad de esta labor en el contexto de las atribuciones del Cuerpo de Ingenieros Militares en España, e igualmente veremos, con ejemplos documentales, de qué manera se organizó esta Junta y cómo los ingenieros se integraron en ella, para finalmente tratar las obras más destacadas, producto de esta estrecha colaboración.In this article we will study the task executed by the Spanish military engineers in public works in the island of Cuba. These engineers worked in Cuba as a specialized body in infrastructures and civil buildings, along with the Real Junta de Fomento, the responsible institution for the promotion and development of agriculture and commerce in the island between 1832 and 1854. To that end, we will analyse the particular work tackled by these engineers in the context of their functions in Spain, and how these ones took part in the organization of the Junta. Finally the most important works undertaken by both institutions will be studied.

  5. Metodología para la Implantación de un Sistema de Gestión por el Conocimiento en Empresas de Diseño y Servicios Ingenieros para el sector de la construcción en Cuba

    OpenAIRE

    Julio Alfredo García Caraballo; José A. Macías Mesa

    2006-01-01

    En la ponencia se presenta la "Metodología para la Implantación de un Sistema de Gestión por el Conocimiento en Empresas de Diseño y Servicios Ingenieros para el sector de la construcción en Cuba " resultado de una investigación científica ejecutada por la Empresa de Proyectos de Arquitectura e Ingeniería de Matanzas con la colaboración de la Universidad de Matanzas "Camilo Cienfuegos" y que aplicada y validada en la primera permitió la creación de los cimientos de una cultura gerencial que r...

  6. Investigación cualitativa de las políticas y prácticas de desarrollo profesional de empresas constructoras con arquitectos técnicos e ingenieros de edificación que trabajan como jefes de obra. Análisis del efecto sobre su satisfacción laboral

    OpenAIRE

    FUENTES DEL BURGO, JOAQUÍN; Navarro Astor, Elena

    2015-01-01

    La investigación ha indagado sobre las políticas y prácticas de desarrollo profesional que las empresas constructoras desarrollan con arquitectos técnicos e ingenieros de edificación que trabajan como jefes de obra. Concretamente se estudiaron las acciones de formación desarrolladas por las empresas, la promoción y los planes de carrera. Además se ha analizado el efecto de estas prácticas sobre la satisfacción laboral de estos técnicos. Se ha utilizado una metodología cualitativa realizand...

  7. Prácticas de desarrollo profesional de empresas constructoras con arquitectos técnicos e ingenieros de edificación que trabajan como jefes de obra. Análisis del efecto sobre su satisfacción laboral

    OpenAIRE

    FUENTES DEL BURGO, JOAQUÍN; Navarro Astor, Elena

    2015-01-01

    La investigación ha indagado sobre las políticas y prácticas de desarrollo profesional que las empresas constructoras desarrollan con arquitectos técnicos e ingenieros de edificación que trabajan como jefes de obra. Concretamente se estudiaron las acciones de formación desarrolladas por las empresas, la promoción y los planes de carrera. Además se ha analizado el efecto de estas prácticas sobre la satisfacción laboral de estos técnicos. Se ha utilizado una metodología cualitativa realizando e...

  8. SOCIAL FORMATION OF AGRICULTURAL ENGINEER. A PEDAGOGIC MODEL / LA FORMACIÓN SOCIOHOMANISTA DEL INGENIERO AGRÓNOMO. UN MODELO PEDAGÓGIGO

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    Clara de los Ángeles Guzmán Góngora

    2013-07-01

    Full Text Available The present-day context claims insuring the strategies of social formation and humanist, in the rescue of the traditions that they identify the nation Cuban. The pertinence in the formation of the professional of the Agricultural Sciences increases the power of from a comprehensive conception in the dynamics of them agriculture itself ecosystems. The pedagogic model for the social formation exposes to the intervening theory the contribution the agricultural engineer's humanist. The projection of the object of study that are been for in three diagrams, from different addresses, by means of the analysis of the relation between the configurations comes to light inherent, the ones that result in dimensions and attributes desired, as from the system of moral values to form in the levels of the process. The agricultural engineer's humanist encounters like didactic applied for focus the social formation the philosophical conception of the activity that contributes to this formation is constituted in the instrument. The proposal for the social formation the agricultural engineer's humanist conceives himself like a comprehensive conception, whose central axis is the process of formation of moral values in the social agricultural context, that refrains through logics essential of the profession and it is synthesized in systematization.

  9. DYNAMICS OF THE PHYSICAL EDUCATION IN THE AGRONOMY’S ENGINEER PROFESSIONAL FORMATION / DINÁMICA DE LA EDUCACIÓN FÍSICA EN LA FORMACIÓN PROFESIONAL DEL INGENIERO AGRÓNOMO

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    José Manuel Benítez García

    2013-04-01

    Full Text Available For the professional's formation needed by society in this XXI century, we do emphasize in a professional that stands out as person and a reflexive being in his technical, cultural and physical training, hence, in this article, attention is focused in Physical Education as an essential condition to achieve professionals integral formation. In diagnostic studies accomplished in the formation of the Agronomy's Engineer at Las Tunas University, insufficiencies in their integral formation from Physical Education were identified, because its dynamics has not being enough deepened, because it is still conceived from a traditional approach, so as to evidence that potentialities of Physical Education are not enough taken into account in the professionals´ formation process. Thus, it is considered here that it is necessary to continue deepening into the specificities of each professional profile and, specially, in the profile of the Agronomist to be able to introduce the necessary changes in the dynamics of the formation process from Professional Physical Education. RESUMEN: Para la formación del profesional que necesita la sociedad en este siglo XXI, se hace énfasis en un profesional que se distinga como persona y como ser reflexivo en su preparación técnica, cultural y física, es por ello que en este artículo se centra la atención en la Educación Física como condición esencial para lograr la formación integral del profesional de Ingeniería Agrónoma. En estudios diagnósticos realizados en la Universidad de las Tunas, se identificó insuficiencias en la formación integral del profesional desde la Educación Física, al no profundizar en la dinámica de dicho proceso que aún se concibe con un enfoque tradicional, lo que evidencia que no se aprovechan al máximo las potencialidades de la Educación Física en el proceso de formación del Ingeniero Agrónomo. Es por ello que se considera necesario continuar profundizando en las

  10. La “fisiología de la ciudad”: médicos, e ingenieros en el Medellín de hace un siglo Urban physiology: physicians and engineers in Medellin, one century ago

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    Luis Fernando González Escobar

    2006-01-01

    Full Text Available Este texto explora el papel cumplido por los médicos en la regulación, el control y el planeamiento de la ciudad de Medellín entre finales del siglo XIX y principios del XX. Se plantea cómo la higiene como saber, importada de Europa por los médicos, orientó prácticas y fue otro de los parámetros del progreso y la civilización de la sociedad y la ciudad entre uno y otro siglo. De igual manera, se da cuenta del influjo que tuvieron el saber y la práctica de los médicos, desde distintas concepciones teóricas, para orientar tanto la higiene privada como la higiene pública de la ciudad. Se destaca la manera en que los médicos, como individuos u organización social, introdujeron sus percepciones, diagnósticos y propuestas sobre los problemas de la salud pública en conferencias, artículos y prácticas concretas que se expresaron en la arquitectura y el urbanismo de la ciudad; así, los médicos de Medellín lograron introducir políticas públicas para la reglamentación y el desarrollo urbano arquitectónico mucho antes que los ingenieros y los arquitectos; en este sentido fueron pioneros en la “planificación”de la ciudad. This paper explores the role accomplished by medical doctors in the regulation, management and planning of the city of Medellín between the XIX and XX centuries. Hygiene as a knowledge, imported by medical doctors from Europe, was applied and used as progress and development parameter for both the society and the city. From different theoretical perspectives, medical knowledge and practice had a vital impact on the definition of hygiene as a private and public matter. It is important to emphasize the approach that medical doctors, as individuals or as members of a social organization, shared their observations, diagnoses and strategies on public health problems not only in conferences and papers but also in tangible actions which are reflected in the architecture and urbanism of the city. In this manner

  11. Ruperto Ferreira : Ingeniero, ministro y pintor

    Directory of Open Access Journals (Sweden)

    Santiago Londoño Vélez

    1991-09-01

    Full Text Available El mismo año, 1845, en que el general Tomás Cipriano de Mosquera en nombre del partido conservador asumió la presidencia de la República de la Nueva Granada, nació Ruperto Ferreira Gómez, en pleno océano Atlántico, a bordo del buque inglés Jane, el 4 de septiembre. Sus padres, don José Ferreira y doña Amalia Gómez, hija de la escritora Josefa Acevedo de Gómez y nieta del tribuno del pueblo José Acevedo y Gómez, regresaban de Inglaterra. Con el reino británico la Nueva Granada mantenía un activo comercio de exportación e importación, que en ese momento se encontraba en una fase de expansión. El viejo continente recibía principalmente metales preciosos y, en menor medida, quina, tabaco y sombreros. El renglón más elevado de las importaciones eran los textiles de algodón y las confecciones, pero no faltaban los alimentos y las bebidas, así como los productos de madera, cuero, papel y vidrio, para uso de la élite.

  12. Ingeniero, político, economista, inventor

    Directory of Open Access Journals (Sweden)

    Jimena Montaña Cuéllar

    2001-01-01

    Full Text Available Técnica y utopía. Biografía intelectual y política de Alejandro López, 1876-1940. Alberto Mayor Mora. Fondo Editorial Universidad Eafit, colección Cielos de Arena, Medellín, 2001, 621 págs., il.

  13. Central line infections - hospitals

    Science.gov (United States)

    ... infection; Central venous catheter - infection; CVC - infection; Central venous device - infection; Infection control - central line infection; Nosocomial infection - central line infection; Hospital acquired ...

  14. Papel de la modelación matemática en la formación de los ingenieros // Role of mathematical modeling in the training of engineers

    Directory of Open Access Journals (Sweden)

    María Lucía Brito-Vallina

    2011-05-01

    Full Text Available Existe una enorme brecha entre las habilidades matemáticas que requiere el ingeniero, vinculadasfundamentalmente a las actividades de modelar, interpretar, comunicarse en un lenguaje preciso,etc., y las habilidades que se forman en los cursos de Matemática, que ponen su mayor énfasis en laactividad de resolver ejercicios de cálculo. Son variadas las causas de este fenómeno, que no esexclusivo de Cuba. El conocimiento científico en general, es concebido por las prácticas sociales, ysin embargo se ha considerado en muchas ocasiones el estudio de las matemáticas como el trabajocon conceptos abstractos, es decir alejados de la actividad humana. La modelación matemática deproblemas, crea en los estudiantes una capacidad y habilidad necesarias para la solución deposibles problemas prácticos.El presente trabajo tiene como objetivo proponer una estrategia metodológica que posibiliteestructurar de modo sistémico el desarrollo de la habilidad de modelar, teniendo en cuenta laclasificación de los principales modelos matemáticos para las ingenierías; según la teoría o técnicautilizada en su elaboración, la naturaleza de los procesos que desarrollan, su estructura matemáticay otras, sin obviar por supuesto, el perfil del profesional de estas carreras y las principalescategorías didácticas del proceso de enseñanza – aprendizaje.Palabras claves: matemática, modelación, ingeniería.__________________________________________________________________AbstractThere is a huge gap between the mathematical skills required by the engineer, primarily related to the activitiesof modeling, interpreting, communicating in precise language, etc., And skills that form in the courses ofMathematics and listed in the programs study, which put the most emphasis on solving activity calculationexercises. There are several causes of this phenomenon which is not unique to Cuba. Scientific knowledge isgenerally conceived by social practices, has emerged and

  15. Papel de la estadística en la formación del ingeniero mecánico. // The paper of the statistic in the formation of the mechanical Engineer.

    Directory of Open Access Journals (Sweden)

    E. Fraga Guerra

    2006-01-01

    Full Text Available La Estadística es una de las ramas de la Matemática de mayor incidencia en estos tiempos; ya que interviene de formaacentuada en las investigaciones y/o métodos científicos a través de la experimentación y la observación.En muchas ocasiones, es necesario realizar una adecuada utilización de los modelos y métodos estadísticos para la solucióne interpretación de los problemas que se presentan continuamente en el campo de las investigaciones de la IngenieríaMecánica, de esta forma se garantiza una eficiencia y confiabilidad en los resultados, por lo que lograr una preparación delos futuros profesionales en esta ciencia es fundamental y es responsabilidad de las Universidades en las distintas etapas deformación del estudiante.En este trabajo se pretende mostrar aspectos fundamentales de la experiencia que se tiene en la enseñanza de la Estadísticaen pregrado y su extensión a la enseñanza de postgrado en la carrera de Ingeniería Mecánica, en este sentido se ha logrado,en primera instancia, vincular la asignatura con el perfil del ingeniero mecánico mediante la realización por parte de losestudiantes de trabajos extraclases en donde se plantean problemas de la especialidad, donde sean necesarios la utilizaciónde estas técnicas, con vistas a incentivar la motivación por la carrera y desarrollar el espíritu investigativo en los alumnos.Por otra parte, se utilizan software profesionales dentro del proceso de la enseñanza que agilizan la obtención de losresultados que con posterioridad serán interpretados por los estudiantes, lo que posibilita un campo más amplio deproblemas a abordar en la asignatura.Palabras Claves: Enseñanza, estadística, formación, experimentación, observación.____________________________________________________________________________Summary.The Statistic is one of the branches of Mathematics of great incidence in the present time; since it takes accentuated part ininvestigations and/or scientific

  16. Central Solenoid

    CERN Multimedia

    2002-01-01

    The Central Solenoid (CS) is a single layer coil wound internally in a supporting cylinder housed in the cryostat of the Liquid Argon Calorimeter. It was successfully tested at Toshiba in December 2000 and was delivered to CERN in September 2001 ready for integration in the LAr Calorimeter in 2003. An intermediate test of the chimney and proximity cryogenics was successfully performed in June 2002.

  17. Europa central

    Directory of Open Access Journals (Sweden)

    Karel BARTOSEK

    2010-02-01

    Full Text Available La investigación francesa continúa interesándose por Europa Central. Desde luego, hay límites a este interés en el ambiente general de mi nueva patria: en la ignorancia, producto del largo desinterés de Francia por este espacio después de la Segunda Guerra Mundial, y en el comportamiento y la reflexión de la clase política y de los medios de comunicación (una anécdota para ilustrar este ambiente: durante la preparación de nuestro coloquio «Refugiados e inmigrantes de Europa Central en el movimiento antifascista y la Resistencia en Francia, 1933-1945», celebrado en París en octubre de 1986, el problema de la definición fue planteado concreta y «prácticamente». ¡Y hubo entonces un historiador eminente, para quién Alemania no formaría parte de Europa Central!.

  18. Central pain.

    Science.gov (United States)

    Singh, Supreet

    2014-12-01

    Questions from patients about pain conditions and analgesic pharmacotherapy and responses from authors are presented to help educate patients and make them more effective self-advocates. The topic addressed in this issue is central pain, a neuropathic pain syndrome caused by a lesion in the brain or spinal cord that sensitizes one's perception of pain. It is a debilitating condition caused by various diseases such as multiple sclerosis, strokes, spinal cord injuries, or brain tumors. Varied symptoms and the use of pharmacological medicines and nonpharmacological therapies will be addressed.

  19. central t

    Directory of Open Access Journals (Sweden)

    Manuel R. Piña Monarrez

    2007-01-01

    Full Text Available Dado que la Regresión Ridge (RR, es una estimación sesgada que parte de la solución de la regresión de Mínimos Cuadrados (MC, es vital establecer las condiciones para las que la distribución central t de Student que se utiliza en la prueba de hipótesis en MC, sea también aplicable a la regresión RR. La prueba de este importante resultado se presenta en este artículo.

  20. Entre teoria e prática Entre la teoría y la práctica: la cartografía de los ingenieros militares en Portugal y en Brasil, siglos XVI-XVII Between theory and practice: the military engineers’ cartography in Portugal and Brazil, Sixteenth – Seventeenth Centuries

    Directory of Open Access Journals (Sweden)

    Beatriz Piccolotto Siqueira Bueno

    2007-11-01

    Full Text Available Este artículo analiza la producción cartográfica de los ingenieros militares en Portugal y en Brasil en los siglos XVI al XVII. Explora las primeras cartas terrestres realizadas en las “Relaciones Topográficas de Castilla y Geográficas de Indias” por los ingenieros militares italianos al servicio de las Coronas Ibéricas. Con base en la lectura de los tratados portugueses y castellanos del periodo, se analizan aspectos técnicos de producción cartográfica, del levantamiento de campo al diseño de gabinete, así como también aspectos referentes a la enseñanza de la Geometría Práctica, Trigonometría y dibujo de mapas topográficos y geográficos en las “Academias Militares” de Portugal, España y Brasil. Confronta la teoría y práctica, con base en el estudio de la preciosa serie documental, comprendiendo sobretodo, diseños o dibujos de Leonardo Turriano, Alexandre Massay e Diogo de Campos MorenoThis paper analyzes the cartographic production of military engineers in Portugal and Brazul during the sixteenth to seventeenth centuries. It explores the first terrestrial charts elaborated in the “Relaciones Topográficas de Castilla y Geográficas de Indias” [“Topographic Relations of Castilla” and “Geographical Relations of Indias”] by Italian Military engineers under the command of the Spanish crown. Based on the review of Portuguese and Spanish treaties of the time, technical aspects of the cartographic production are analyzed, from field surveys to desk design, as well as aspects regarding the teaching of Practical Geometry, Trigonometry and drawing of topographic and geographic maps in the “Academias Militares” [“Military Academies”] of Portugal, Spain and Brazil. Here the theory and practice are confronted based on the study of the invaluable documentary series, which comprises mostly designs and drawings by Leonardo Turriano, Alexandre Massay and Diogo de Campos Moreno.

  1. Metodología para la Implantación de un Sistema de Gestión por el Conocimiento en Empresas de Diseño y Servicios Ingenieros para el sector de la construcción en Cuba

    Directory of Open Access Journals (Sweden)

    Julio Alfredo García Caraballo

    2006-01-01

    Full Text Available En la ponencia se presenta la "Metodología para la Implantación de un Sistema de Gestión por el Conocimiento en Empresas de Diseño y Servicios Ingenieros para el sector de la construcción en Cuba " resultado de una investigación científica ejecutada por la Empresa de Proyectos de Arquitectura e Ingeniería de Matanzas con la colaboración de la Universidad de Matanzas "Camilo Cienfuegos" y que aplicada y validada en la primera permitió la creación de los cimientos de una cultura gerencial que reconoce el valor que tienen para una organización, el uso adecuado de la información y la insustituible importancia de utilizar y preservar los conocimientos adquiridos por los trabajadores en el transcurso del tiempo, que son a su vez parte estratégica de su patrimonio. Dicha metodología facilita extender esta cultura a todos los niveles de dirección de la organización y entre sus trabajadores, como vía para alcanzar la eficacia y eficiencia necesarias en nuestra economía.

  2. Central bank Financial Independence

    OpenAIRE

    J.Ramon Martinez-Resano

    2004-01-01

    Central bank independence is a multifaceted institutional design. The financial component has been seldom analysed. This paper intends to set a comprehensive conceptual background for central bank financial independence. Quite often central banks are modelled as robot like maximizers of some goal. This perspective neglects the fact that central bank functions are inevitably deployed on its balance sheet and have effects on its income statement. A financially independent central bank exhibits ...

  3. NIDDK Central Repository

    Data.gov (United States)

    U.S. Department of Health & Human Services — The NIDDK Central Repository stores biosamples, genetic and other data collected in designated NIDDK-funded clinical studies. The purpose of the NIDDK Central...

  4. Central Neuropathic Pain Syndromes.

    Science.gov (United States)

    Watson, James C; Sandroni, Paola

    2016-03-01

    Chronic pain is common in patients with neurologic complications of a central nervous system insult such as stroke. The pain is most commonly musculoskeletal or related to obligatory overuse of neurologically unaffected limbs. However, neuropathic pain can result directly from the central nervous system injury. Impaired sensory discrimination can make it challenging to differentiate central neuropathic pain from other pain types or spasticity. Central neuropathic pain may also begin months to years after the injury, further obscuring recognition of its association with a past neurologic injury. This review focuses on unique clinical features that help distinguish central neuropathic pain. The most common clinical central pain syndromes-central poststroke pain, multiple sclerosis-related pain, and spinal cord injury-related pain-are reviewed in detail. Recent progress in understanding of the pathogenesis of central neuropathic pain is reviewed, and pharmacological, surgical, and neuromodulatory treatments of this notoriously difficult to treat pain syndrome are discussed.

  5. Central venous catheter - flushing

    Science.gov (United States)

    ... during cancer treatment Bone marrow transplant - discharge Central venous catheter - dressing change Peripherally inserted central catheter - flushing Sterile technique Surgical wound care - open Review Date 9/22/2016 Updated by: ...

  6. Estudio del estado de los Puentes en la Carretera Central en su travesía por la provincia de Matanzas.

    Directory of Open Access Journals (Sweden)

    Yordanis Cuba Cepero

    2012-01-01

    Full Text Available La Carretera Central es considerada una de las Siete Maravillas de la Ingeniería Civil en Cuba, según selección realizada en 1997 por la Unión Nacional de Arquitectos e Ingenieros de la Construcción de Cuba-UNAICC. Con el paso de los años, estudiosos de esa obra refuerzan su criterio de que fue el primer megaproyecto realizado en Cuba, por la complejidad de su ejecución y porque atravesó la isla por su centro. Considerando que uno de los territorios atravesados por esta importante vía, es la provincia de Matanzas, y que desde su puesta en explotación, a finales de la década del 20´ del siglo pasado, han sido escasas las acciones de conservación (mantenimiento, rehabilitación y adaptación, es que se decide actualizar el estado de los puentes localizados en esta importante vía y a su vez proponer acciones de carácter general para la gestión de su rehabilitación.

  7. Central Laboratories Services

    Data.gov (United States)

    Federal Laboratory Consortium — The TVA Central Laboratories Services is a comprehensive technical support center, offering you a complete range of scientific, engineering, and technical services....

  8. Central Pain Syndrome

    Science.gov (United States)

    ... or hands. Central pain syndrome often begins shortly after the causative injury or damage, but may be delayed by months or even years, especially if it is related to post-stroke pain. × Definition Central pain syndrome is a neurological ...

  9. Central centrifugal cicatricial alopecia

    Directory of Open Access Journals (Sweden)

    Collin Blattner

    2013-01-01

    Full Text Available Central centrifugal cicatricial alopecia is a common cause of progressive permanent apical alopecia. This unique form of alopecia includes entities previously know as "hot comb alopecia," "follicular degeneration syndrome," "pseudopelade" in African Americans and "central elliptical pseudopelade" in Caucasians. The etiology appears to be multifactorial and the condition occurs in all races.

  10. Optimal central bank transparency

    NARCIS (Netherlands)

    van der Cruijsen, C.A.B.; Eijffinger, S.C.W.; Hoogduin, L.

    2008-01-01

    Should central banks increase their degree of transparency any further? We show that there is likely to be an optimal intermediate degree of central bank transparency. Up to this optimum more transparency is desirable: it improves the quality of private sector inflation forecasts. But beyond the opt

  11. Optimal central bank transparency

    NARCIS (Netherlands)

    van der Cruijsen, C.A.B.; Eijffinger, S.C.W.; Hoogduin, L.H.

    2010-01-01

    Should central banks increase their degree of transparency any further? We show that there is likely to be an optimal intermediate degree of central bank transparency. Up to this optimum more transparency is desirable: it improves the quality of private sector inflation forecasts. But beyond the opt

  12. The central peak revisited

    Energy Technology Data Exchange (ETDEWEB)

    Shirane, G.

    1995-10-27

    The central peak in SrTiO{sub 3} was first observed by Riste and his collaborators in 1971. This was one of the key discoveries leading to an understanding of the dynamics of phase transitions. The most recent discovery of two length scales in SrTiO{sub 3} motivated a reinvestigation of the soft phonon and associated central peak by neutron scattering. These recent experiments shed new light on the nature of the central peak. It is now well established to be strongly sample dependent and it originates from defects in bulk crystals.

  13. Imaging central pain syndromes.

    Science.gov (United States)

    Veldhuijzen, Dieuwke S; Greenspan, Joel D; Kim, Jong H; Coghill, Robert C; Treede, Rolf-Detlef; Ohara, Shinji; Lenz, Frederick A

    2007-06-01

    Anatomic, functional, and neurochemical imaging studies have provided new investigative tools in the study of central pain. High-resolution imaging studies allow for precise determination of lesion location, whereas functional neuroimaging studies measure pathophysiologic consequences of injury to the central nervous system. Additionally, magnetic resonance spectroscopy evaluates lesion-induced neurochemical changes in specific brain regions that may be related to central pain. The small number of studies to date precludes definitive conclusions, but the recent findings provide information that either supports or refutes current hypotheses and can serve to generate new ideas.

  14. Central nervous system resuscitation

    DEFF Research Database (Denmark)

    McIntosh, T K; Garde, E; Saatman, K E;

    1997-01-01

    Traumatic injury to the central nervous system induces delayed neuronal death, which may be mediated by acute and chronic neurochemical changes. Experimental identification of these injury mechanisms and elucidation of the neurochemical cascade following trauma may provide enhanced opportunities ...

  15. Central Asian Republic Info

    Data.gov (United States)

    US Agency for International Development — CAR Info is designed and managed by the Central Asian Republic Mission to fill in the knowledge and reporting gaps in existing agency systems for that Mission. It...

  16. Central nervous system

    Science.gov (United States)

    The central nervous system is composed of the brain and spinal cord. Your brain and spinal cord serve as the main "processing center" for your entire nervous system. They control all the workings of your body.

  17. Central nervous system resuscitation

    DEFF Research Database (Denmark)

    McIntosh, T K; Garde, E; Saatman, K E

    1997-01-01

    Traumatic injury to the central nervous system induces delayed neuronal death, which may be mediated by acute and chronic neurochemical changes. Experimental identification of these injury mechanisms and elucidation of the neurochemical cascade following trauma may provide enhanced opportunities...

  18. "Central Station" Londonis

    Index Scriptorium Estoniae

    2000-01-01

    Londoni galeriis Milch seitsme läti, leedu ja eesti kunstniku projekt "Central Station". Kuraatorid Lisa Panting, Sally Tallant. Eestist osalevad Hanno Soans (Catarina Campinoga koostöös valminud video), Kiwa, Kai Kaljo

  19. Central Station Design Options

    DEFF Research Database (Denmark)

    2011-01-01

    The purpose of EDISON Work Package 4.1 is the evaluation of possible Central (charging) Stations design options for making possible the public charging of Electric Vehicles (EVs). A number of scenarios for EVs are assessed, with special emphasis on the options of Fast Charging and Battery Swapping....... The work identifies the architecture, sizing and siting of prospective Central Stations in Denmark, which can be located at shopping centers, large car parking lots or gas stations. Central Stations are planned to be integrated in the Danish distribution grid. The Danish island of Bornholm, where a high.......g. due to vandalism, the charge supply circuit is disconnected. More electrical vehicles on the market are capable today of quick charging up to 50 kW power level. The feasibility of Central Stations with fast charging/swapping option, their capacity, design, costs and grid impact, as well as battery...

  20. Gangs in Central America

    Science.gov (United States)

    2008-10-17

    Citizen Security held in July 2008 indicated that Guatemala now has the second highest murder rate in Central America (roughly 45 per 100,000 people...training regional security forces.48 In recent years, the U.S. Southern Command has taken a leading role in discussing the problem of citizen security in...the results CRS-19 51 “Memo: The Merida Initiative and Citizen Security in Mexico and Central America,” Washington Office on Latin America, March 2008

  1. Outsourcing central banking

    DEFF Research Database (Denmark)

    Khoury, Sarkis Joseph; Wihlborg, Clas

    2005-01-01

    The literature on Currency Boards (CB) stops at the water edge in terms of dealing with the totality of the functions of a central bank. Monetary policy, and banking supervisioncan be "outsourced" in an open economy with substantial foreign direct investment (FDI)in the banking sector if political...... the feasibility of, and constraints on, outsourcing of central bank functions. A brief discussion of the Argentinian experience is used for contrast.Key words: Currency Board, Foreign Banks, Supervision, Regional Integration,outsourcing....

  2. Los Ingenieros Geógrafos de México

    Directory of Open Access Journals (Sweden)

    Héctor Mendoza Vargas

    2002-11-01

    Full Text Available Hasta ahora se han conseguido avances significativos en el conocimiento sobre la enseñanza de la Geografía y los procesos de institucionalización, sobre todo, en las universidades europeas, como Berlín (1860-1870, París (1870-1871 y Londres (1886-1887 (Capel, 1988. Con más rezago y no pocas dificultades en la búsqueda de la documentación e interpretación de los papeles han quedado otras experiencias geográficas, también de Europa, pero que su creación y práctica se alejaron de la tradició...

  3. Curso Python para científicos e ingenieros

    OpenAIRE

    Cano, Juan Luis

    2014-01-01

    Curso de introducción a Python impartido por Juan Luis Cano (pybonacci.wordpress.com) y organizado por CAChemE (cacheme.org) con el siguiente temario: Introducción a la sintaxis de Python; Uso del Notebook de IPython; Introducción a NumPy; Representación gráfica con matplotlib; Análisis numérico con SciPy; Cálculo simbólico con SymPy; Introducción a la depuración, testing y buenas prácticas; Instalación de Python en Windows. Este material ha sido elaborado gracias a la ayuda económica conc...

  4. Manual de geología para ingenieros

    OpenAIRE

    Duque Escobar, Gonzalo

    2003-01-01

    A continuación se presenta un texto para los cursos de Geología en los programas de Ingeniería, con información sobre la geología física de Colombia. El punto de partida de este texto han sido mis notas del curso que dicto en Ingeniería Civil y las del Postgrado en Geotecnia de la Universidad Nacional. Me he apoyado en la información complementaria de investigadores nacionales buscando un texto que permita la formación para enfrentar con acierto los problemas de Geotecnia típicos del medio tr...

  5. ALGUNAS PERSPECTIVAS HISTORICAS EN EL PERFIL DEL INGENIERO

    OpenAIRE

    ADRIANA PATRICIA GALLEGO TORRES; JULIO BARON VELANDIA

    2012-01-01

    The concept of engineering has evolved significantly overin the history of mankind. It can establish three clear milestonesramente defined: antiquity and the Middle Ages, the Industrial Revolutionand modernity.

  6. Competencias profesionales del ingeniero en informática

    OpenAIRE

    Ortega Izquierdo, Andrés

    2012-01-01

    Este proyecto final de carrera pertenece al área de Competencias Profesionales y tiene como objetivo el análisis de experiencias de enseñanza-aprendizaje de la competencia de comunicación escrita en currículos TIC. El estudio se compone de tres partes: contextualización, investigación y reflexión. En la contextualización se define el concepto de competencia profesional y se clasifican las competencias genéricas o transversales en: competencias instrumentales, competencias interpersonales y co...

  7. CENTRAL PLATEAU REMEDIATION

    Energy Technology Data Exchange (ETDEWEB)

    ROMINE, L.D.

    2006-02-01

    A systematic approach to closure planning is being implemented at the Hanford Site's Central Plateau to help achieve the goal of closure by the year 2035. The overall objective of Central Plateau remediation is to protect human health and the environment from the significant quantity of contaminated material that resulted from decades of plutonium production in support of the nation's defense. This goal will be achieved either by removing contaminants or placing the residual contaminated materials in a secure configuration that minimizes further migration to the groundwater and reduces the potential for inadvertent intrusion into contaminated sites. The approach to Central Plateau cleanup used three key concepts--closure zones, closure elements, and closure process steps--to create an organized picture of actions required to complete remediation. These actions were merged with logic ties, constraints, and required resources to produce an integrated time-phased schedule and cost profile for Central Plateau closure. Programmatic risks associated with implementation of Central Plateau closure were identified and analyzed. Actions to mitigate the most significant risks are underway while high priority remediation projects continue to make progress.

  8. The Naive Central Banker

    Directory of Open Access Journals (Sweden)

    Marcelo de Carvalho Griebeler

    2015-09-01

    Full Text Available There has been in some countries a trend of assigning other functions to central banks besides price stability. The most suggested function to be added to monetary authority’s obligations is to pursue economic growth or full employment. In this paper we characterize the behavior and analyse the optimal monetary policy of, what we call, a naive central banker. We describe the naive behavior as one that does face the inflation-unemployment trade-off, but it tries to minimize both variables simultaneously. Our findings, both under discretion and commitment, indicate that the naive central banker delivers lower expected inflation and inflation variance than the benchmark behavior whenever the economy is rigid enough. However, the degree of conservativeness also affects this result, such that the less conservative the naive policymaker, the more rigidity is necessary.

  9. SOCRATES Invades Central Europe

    Directory of Open Access Journals (Sweden)

    Joseph Slowinski

    1998-04-01

    Full Text Available The objective of this article is to explore the current reality faced by higher education students in Central and Eastern Europe and to draw out the implications of this current reality for policy makers in the future. In the article, I explore the influence of transnational corporations' training programs on education as it currently pertains to Central and Eastern European higher education and employment. In addition, multinational corporate entities exercise influence on European Union policy through the role of lobby organizations and activities. I explore the influence of these practices on education with an emphasis on the emerging importance of Western language skills. In addition, I focus on the European Union and its efforts to expand into Central and Eastern Europe in order to provide a focal point for analysis.

  10. Central Bank independence

    Directory of Open Access Journals (Sweden)

    Vasile DEDU

    2012-08-01

    Full Text Available In this paper we present the key aspects regarding central bank’s independence. Most economists consider that the factor which positively influences the efficiency of monetary policy measures is the high independence of the central bank. We determined that the National Bank of Romania (NBR has a high degree of independence. NBR has both goal and instrument independence. We also consider that the hike of NBR’s independence played an important role in the significant disinflation process, as headline inflation dropped inside the targeted band of 3% ± 1 percentage point recently.

  11. Several Centuries of Centrality

    OpenAIRE

    Roth, Dana L.

    2015-01-01

    As Carolyn Bertozzi mentioned in her inaugural editorial, the relationship of “Central Science” to “Chemistry” became popularized over 40 years ago with the publication of the first edition of Brown and LeMay’s Chemistry: The Central Science, now in its 13th edition. Yet as late as 2003, Prof. Sason Shaik at The Hebrew University claimed “popularization of chemistry remains scant.” He goes on to share [his] “own experience of popularizing chemistry by delivering the following universal messag...

  12. Glueballs A central mystery

    CERN Document Server

    Close, Francis Edwin

    2000-01-01

    Glueball candidates and qqbar mesons have been found to be produced with different momentum and angular dependences in the central region of pp collisions. This talk illustrates this phenomenon and explains the phi and t dependences of mesons with JPC = 0++,0-+, 1++, 2++ and 2-+. For production of 0++ and 2++ mesons the analysis reveals a systematic behaviour in the data that appears to distinguish between qqbar and non-qqbar or glueball candidates. An explanation is given for the absence of 0-+ glueball candidates in central production at present energies and the opportunity for their discovery at RHIC is noted.

  13. Retiring the central executive.

    Science.gov (United States)

    Logie, Robert H

    2016-10-01

    Reasoning, problem solving, comprehension, learning and retrieval, inhibition, switching, updating, or multitasking are often referred to as higher cognition, thought to require control processes or the use of a central executive. However, the concept of an executive controller begs the question of what is controlling the controller and so on, leading to an infinite hierarchy of executives or "homunculi". In what is now a QJEP citation classic, Baddeley [Baddeley, A. D. (1996). Exploring the central executive. Quarterly Journal of Experimental Psychology, 49A, 5-28] referred to the concept of a central executive in cognition as a "conceptual ragbag" that acted as a placeholder umbrella term for aspects of cognition that are complex, were poorly understood at the time, and most likely involve several different cognitive functions working in concert. He suggested that with systematic empirical research, advances in understanding might progress sufficiently to allow the executive concept to be "sacked". This article offers an overview of the 1996 article and of some subsequent systematic research and argues that after two decades of research, there is sufficient advance in understanding to suggest that executive control might arise from the interaction among multiple different functions in cognition that use different, but overlapping, brain networks. The article concludes that the central executive concept might now be offered a dignified retirement.

  14. Central Nervous System Tuberculosis

    OpenAIRE

    Bano, Shahina; Chaudhary, Vikas; Yadav, Sachchidanand

    2012-01-01

    Central nervous system tuberculosis is a rare presentation of active tuberculosis and accounts for about 1% of cases (1). The three clinical categories include meningitis, intracranial tuberculomas, and spinal tuberculous arachnoiditis. We report a case of a young man who presented with active pulmonary tuberculosis in addition to tuberculous meningitis and the presence of numerous intracranial tuberculomas.

  15. Central venous line - infants

    Science.gov (United States)

    A central venous line (CVL) is a long, soft, plastic tube that is put into a large vein in the chest. WHY IS A CVL USED? A CVL is often put in when a baby cannot get a ... (MCC). A CVL can be used to give nutrients or medicines to a ...

  16. CMS Central Hadron Calorimeter

    OpenAIRE

    Budd, Howard S.

    2001-01-01

    We present a description of the CMS central hadron calorimeter. We describe the production of the 1996 CMS hadron testbeam module. We show the results of the quality control tests of the testbeam module. We present some results of the 1995 CMS hadron testbeam.

  17. Ecodesign in Central America

    NARCIS (Netherlands)

    Crul, M.R.M.

    2003-01-01

    This PhD thesis describes and analyses the change process started by the Ecodesign project in Central America, executed between 1998 and 2002. The project started using the concept and praxis developed in Europe. Nine ecodesign projects were performed in industry, and ecodesign was introduced to cou

  18. Central nervous system tuberculosis.

    Science.gov (United States)

    Torres, Carlos; Riascos, Roy; Figueroa, Ramon; Gupta, Rakesh K

    2014-06-01

    Tuberculosis (TB) has shown a resurgence in nonendemic populations in recent years and accounts for 8 million deaths annually in the world. Central nervous system involvement is one of the most serious forms of this infection, acting as a prominent cause of morbidity and mortality in developing countries. The rising number of cases in developed countries is mostly attributed to factors such as the pandemic of acquired immunodeficiency syndrome and increased migration in a globalized world. Mycobacterium TB is responsible for almost all cases of tubercular infection in the central nervous system. It can manifest in a variety of forms as tuberculous meningitis, tuberculoma, and tubercular abscess. Spinal infection may result in spondylitis, arachnoiditis, and/or focal intramedullary tuberculomas. Timely diagnosis of central nervous system TB is paramount for the early institution of appropriate therapy, because delayed treatment is associated with severe morbidity and mortality. It is therefore important that physicians and radiologists understand the characteristic patterns, distribution, and imaging manifestations of TB in the central nervous system. Magnetic resonance imaging is considered the imaging modality of choice for the study of patients with suspected TB. Advanced imaging techniques including magnetic resonance perfusion and diffusion tensor imaging may be of value in the objective assessment of therapy and to guide the physician in the modulation of therapy in these patients.

  19. Central Dogma Goes Digital.

    Science.gov (United States)

    Lin, Yihan; Elowitz, Michael B

    2016-03-17

    In this issue of Molecular Cell, Tay and colleagues (Albayrak et al., 2016) describe a new technique to digitally quantify the numbers of protein and mRNA in the same mammalian cell, providing a new way to look at the central dogma of molecular biology.

  20. Multicultural Central Asia.

    Science.gov (United States)

    Boyle, Eric D.

    This article addresses the multicultural aspect of Central Asia in response to the discussion on diversity in U.S. classrooms. Many areas of the world are more diverse than the U.S., and these areas experience successes and failures with many of the same issues the U.S. is currently struggling with. Comparing the U.S. diversity debate with similar…

  1. Channeling the Central Dogma.

    Science.gov (United States)

    Calabrese, Ronald L

    2014-05-21

    How do neurons and networks achieve their characteristic electrical activity, regulate this activity homeostatically, and yet show population variability in expression? In this issue of Neuron, O'Leary et al. (2014) address some of these thorny questions in this theoretical analysis that starts with the Central Dogma.

  2. Company activities - central region

    Energy Technology Data Exchange (ETDEWEB)

    Ayling, G.

    2007-06-15

    The first section of the article gives an overview of exploration and new developments in the field of gold, nickel, diamond and opal mining in central Queensland. The second part looks at coal, coal seam gas and petroleum exploration and development projects in the area. 1 fig.

  3. Testing for central symmetry

    NARCIS (Netherlands)

    Einmahl, John; Gan, Zhuojiong

    2016-01-01

    Omnibus tests for central symmetry of a bivariate probability distribution are proposed. The test statistics compare empirical measures of opposite regions. Under rather weak conditions, we establish the asymptotic distribution of the test statistics under the null hypothesis; it follows that they a

  4. Central areolar choroidal dystrophy.

    NARCIS (Netherlands)

    Boon, C.J.F.; Klevering, B.J.; Cremers, F.P.M.; Zonneveld-Vrieling, M.N.; Theelen, T.; Hollander, A.I. den; Hoyng, C.B.

    2009-01-01

    OBJECTIVE: To describe the clinical characteristics, follow-up data and molecular genetic background in a large group of patients with central areolar choroidal dystrophy (CACD). DESIGN: Retrospective case series study. PARTICIPANTS: One hundred three patients with CACD from the Netherlands. METHODS

  5. Induced, endogenous and exogenous centrality

    OpenAIRE

    Everett, Martin G.; Stephen P. Borgatti

    2010-01-01

    Centrality measures are based upon the structural position an actor has within the network. Induced centrality, sometimes called vitality measures, take graph invariants as an overall measure and derive vertex level measures by deleting individual nodes or edges and examining the overall change. By taking the sum of standard centrality measures as the graph invariant we can obtain measures which examine how much centrality an individual node contributes to the centrality of the other nodes in...

  6. Do Central Banks Need Capital?

    OpenAIRE

    Peter Stella

    1997-01-01

    Central banks may operate perfectly well without capital as conventionally defined. A large negative net worth, however, is likely to compromise central bank independence and interfere with its ability to attain policy objectives. If society values an independent central bank capable of effectively implementing monetary policy, recapitalization may become essential. Proper accounting practice in determining central bank profit or loss and rules governing the transfer of the central bank’s ope...

  7. Central simple Poisson algebras

    Institute of Scientific and Technical Information of China (English)

    SU Yucai; XU Xiaoping

    2004-01-01

    Poisson algebras are fundamental algebraic structures in physics and symplectic geometry. However, the structure theory of Poisson algebras has not been well developed. In this paper, we determine the structure of the central simple Poisson algebras related to locally finite derivations, over an algebraically closed field of characteristic zero.The Lie algebra structures of these Poisson algebras are in general not finitely-graded.

  8. Central corneal abscess.

    Science.gov (United States)

    van Bijsterveld, O P

    1976-05-01

    Central corneal abscess developed in the experimental animal after inoculation of biologically active staphylococcal strains in a paracentral epithelial lesion of the cornea. These abscesses did not ulcerate, developed only with high inocula, occurred more frequently in immunized rabbits. A serpiginous type of ulceration did not develop at the site of the initial epithelial lesion nor at any other place in the cornea. Histologically, the lesions consisted of densely packed polymorphonuclear leukocytes between the corneal lamellae.

  9. FNAL central email systems

    Energy Technology Data Exchange (ETDEWEB)

    Schmidt, Jack; Lilianstrom, Al; Pasetes, Ray; Hill, Kevin; /Fermilab

    2004-10-01

    The FNAL Email System is the primary point of entry for email destined for an employee or user at Fermilab. This centrally supported system is designed for reliability and availability. It uses multiple layers of protection to help ensure that: (1) SPAM messages are tagged properly; (2) All mail is inspected for viruses; and (3) Valid mail gets delivered. This system employs numerous redundant subsystems to accomplish these tasks.

  10. Centrality Measures in Networks

    CERN Document Server

    Bloch, Francis; Tebaldi, Pietro

    2016-01-01

    We show that although the prominent centrality measures in network analysis make use of different information about nodes' positions, they all process that information in an identical way: they all spring from a common family that are characterized by the same simple axioms. In particular, they are all based on a monotonic and additively separable treatment of a statistic that captures a node's position in the network.

  11. Distributed Assessment of Network Centrality

    CERN Document Server

    Wehmuth, Klaus

    2011-01-01

    We propose a method for the Distributed Assessment of Network CEntrality (DANCE) in complex networks. DANCE attributes to each node a volume-based centrality computed using only localized information, thus not requiring knowledge of the full network topology. We show DANCE is simple, yet efficient, in assessing node centrality in a distributed way. Our proposal also provides a way for locating the most central nodes, again using only the localized information at each node. We also show that the node rankings based on DANCE's centrality and the traditional closeness centrality correlate very well. This is quite useful given the vast potential applicability of closeness centrality, which is however limited by its high computational costs. We experimentally evaluate DANCE against a state-of-the-art proposal to distributively assess network centrality. Results attest that DANCE achieves similar effectiveness in assessing network centrality, but with a significant reduction in the associated costs for practical ap...

  12. Central core disease

    Directory of Open Access Journals (Sweden)

    Jungbluth Heinz

    2007-05-01

    Full Text Available Abstract Central core disease (CCD is an inherited neuromuscular disorder characterised by central cores on muscle biopsy and clinical features of a congenital myopathy. Prevalence is unknown but the condition is probably more common than other congenital myopathies. CCD typically presents in infancy with hypotonia and motor developmental delay and is characterized by predominantly proximal weakness pronounced in the hip girdle; orthopaedic complications are common and malignant hyperthermia susceptibility (MHS is a frequent complication. CCD and MHS are allelic conditions both due to (predominantly dominant mutations in the skeletal muscle ryanodine receptor (RYR1 gene, encoding the principal skeletal muscle sarcoplasmic reticulum calcium release channel (RyR1. Altered excitability and/or changes in calcium homeostasis within muscle cells due to mutation-induced conformational changes of the RyR protein are considered the main pathogenetic mechanism(s. The diagnosis of CCD is based on the presence of suggestive clinical features and central cores on muscle biopsy; muscle MRI may show a characteristic pattern of selective muscle involvement and aid the diagnosis in cases with equivocal histopathological findings. Mutational analysis of the RYR1 gene may provide genetic confirmation of the diagnosis. Management is mainly supportive and has to anticipate susceptibility to potentially life-threatening reactions to general anaesthesia. Further evaluation of the underlying molecular mechanisms may provide the basis for future rational pharmacological treatment. In the majority of patients, weakness is static or only slowly progressive, with a favourable long-term outcome.

  13. West and Central Africa.

    Science.gov (United States)

    Lydie, N; Robinson, N J

    1998-01-01

    This article reviews scientific and other literature during the 1990s that links migration and mobility with the spread of sexually transmitted diseases (STDs), including HIV/AIDS. The focus is on key population groups linked to the spread of HIV and STDs in West and Central Africa: migrant laborers, truck drivers, itinerant traders, commercial sex workers (CSWs), and refugees. Countries with high emigration and immigration tend to have high levels of HIV infection, with the exception of Senegal. The main destination of immigrants are Senegal, Nigeria, and Cote d'Ivoire in West Africa and Cameroon, Congo, Gabon, and Congo in Central Africa. The risk of infection and the spread of HIV is variable among migrants. There is little in the literature that substantiates hypotheses about the strong association between migration and HIV-positive status. Information is needed on the duration, frequency of return visits, living conditions, sexual activities with multiple partners, and information before departure, along the routes, at final destination, and at the time of returns. Action-based research in five West African countries (Burkina Faso, Cote d'Ivoire, Mali, Niger, and Senegal) should produce results in late 1998. Comparable studies in Central Africa are unknown. Regional studies should be complemented by local studies. Prevention would benefit from studies on the relative size of these five population groups by geographic location.

  14. Central African Republic.

    Science.gov (United States)

    1986-02-01

    Focus in this discussion of the Central African Republic is on: geography; the people; history and political conditions; government; the economy; foreign relations; and relations with the US. The population of the Central African Republic totaled 2.7 million in 1985 with an annual growth rate of 2.8%. The infant mortality rate is 134/1000 with life expectancy at 49 years. The Central African Republic is at almost the precise center of Africa, about 640 km from the nearest ocean. More than 70% of the population live in rural areas. There are more than 80 ethnic groups, each with its own language. The precolonial history of the area was marked by successive waves of migration, of which little is known. These migrations are responsible for the complex ethnic and linguistic patterns today. United with Chad in 1906, it formed the Oubangui-Chari-Chad colony. In 1910, it became 1 of the 4 territories of the Federation of French Equatorial Africa, along with Chad, Congo, and Gabon. After World War II, the French Constitution of 1946 inaugurated the first of a series of reforms that led eventually to complete independence for all French territories in western and equatorial Africa. The nation became an autonomous republic within the newly established French Community on December 1, 1958, and acceded to complete independence as the Central Africa Republic on August 13, 1960. The government is made up of the executive and the judicial branches. The constitution and legislature remain suspended. All executive and legislative powers, as well as judicial oversight, are vested in the chief of state. The Central African Republic is 1 of the world's least developed countries, with an annual per capita income of $310. 85% of the population is engaged in subsistence farming. Diamonds account for nearly 1/3 of export earnings; the industrial sector is limited. The US terminated bilateral assistance programs in 1979, due to the human rights violations of the Bokassa regime, but modest

  15. Central venous catheter - dressing change

    Science.gov (United States)

    ... during cancer treatment Bone marrow transplant - discharge Central venous catheter - flushing Peripherally inserted central catheter - flushing Sterile technique Surgical wound care - open Review Date 9/17/2016 Updated by: ...

  16. Central effects of fingolimod.

    Science.gov (United States)

    Cruz, Vítor T; Fonseca, Joaquim

    2014-08-01

    Introduccion. El fingolimod, un modulador del receptor de la esfingosina-1-fosfato (S1P) dotado de un mecanismo de accion novedoso, fue el primer tratamiento oral aprobado para la esclerosis multiple remitente recurrente. Su union a los receptores S1P1 de los linfocitos promueve la retencion selectiva de los linfocitos T virgenes y de memoria central en los tejidos linfoides secundarios, lo que impide su salida hacia el sistema nervioso central (SNC). Asimismo, el fingolimod atraviesa con facilidad la barrera hematoencefalica, y diversos estudios le atribuyen un efecto neuroprotector directo en el SNC. Objetivo. Revisar la informacion disponible acerca de los efectos centrales del fingolimod. Desarrollo. El desequilibrio entre los procesos lesivos y reparadores constituye un reflejo de la desmielinizacion cronica, la degeneracion axonal y la gliosis, y parece contribuir a la discapacidad que la esclerosis multiple acarrea. La facilidad con la que el fingolimod atraviesa la barrera hematoencefalica le permite actuar directamente sobre los receptores S1P localizados en las celulas del SNC. Una vez en el interior del SNC, ocupa los receptores S1P de los oligodendrocitos y de sus celulas precursoras, de los astrocitos, los microgliocitos y las neuronas, fomentando la remielinizacion, la neuroproteccion y los procesos endogenos de regeneracion. La eficacia evidenciada en los ensayos clinicos concuerda con un mecanismo de accion que incluiria efectos directos sobre las celulas del SNC. Conclusiones. Los datos disponibles indican que la eficacia del fingolimod en el tratamiento de la esclerosis multiple se debe a su ambivalencia como molecula inmunomoduladora y moduladora directa de los receptores S1P del SNC. Tanto es asi que estudios recientes le atribuyen efectos neuroprotectores en varios modelos que suscitan expectativas en torno a su posible aplicacion terapeutica en la enfermedad de Alzheimer, el paludismo cerebral y el neuroblastoma, asi como en la neuroproteccion

  17. [Central anticholinergic syndrome].

    Science.gov (United States)

    Fernández Urretavizcaya, P; Cenoz Osinaga, J C; Jáuregui Garía, M L; Gállego Culleré, J

    1991-10-01

    Two new cases of anticolinergic central syndrome are described. The first case, a 8 year old girl, suffered a severe encefalopathy after topical application of mydriatic cholirio as an aid in a rutine study of ocular refraction. The second case, 67 year old man presented a severe neurological picture after accidental intake of a silvester plantground (Atropa belladonna). His neurological condition returned quickly to normal whith administration of physostigmine. Differents aspects of the etiology, clinical picture and diagnosis are discussed with special emphasis in patients with delirium or acute confusional states. Finally, attention is drawn in the necessity of a properly use of anticholinergic drugs overcoat in aged or children.

  18. Central osteosclerosis with trichothiodystrophy

    Energy Technology Data Exchange (ETDEWEB)

    Wakeling, Emma L.; Brady, Angela F. [North West Thames Regional Genetics Service, Kennedy-Galton Centre, Level 8 V, North West London Hospitals NHS Trust, Watford Road, HAI 3UJ, Harrow, Middlesex (United Kingdom); Cruwys, Michele [Department of Paediatrics, Hillingdon Hospital, Hillingdon, Middlesex (United Kingdom); Suri, Mohnish [Clinical Genetics Service, City Hospital, Nottingham (United Kingdom); Aylett, Sarah E. [Neurosciences Unit, Great Ormond Street Hospital for Children NHS Trust, London (United Kingdom); Hall, Christine [Department of Radiology, Great Ormond Street Hospital for Children NHS Trust, London (United Kingdom)

    2004-07-01

    Trichothiodystrophy (TTD) is a rare, autosomal recessive, multisystem disorder associated with defects in nucleotide excision repair. We report a 7-year-old boy with TTD due to mutation in the XPD gene. The patient has classic features of this condition, including brittle, sulphur-deficient hair, ichthyosis, growth retardation and developmental delay. In addition, he has radiological evidence of progressive central osteosclerosis. Although similar radiological findings have previously been reported in a small number of patients, this association is not widely recognised. We review the radiological findings in this and other similar cases and discuss the natural history of these bony changes. (orig.)

  19. Centralized vs. De-centralized Multinationals and Taxes

    DEFF Research Database (Denmark)

    Nielsen, Søren Bo; Raimondos-Møller, Pascalis; Schjelderup, Guttorm

    2005-01-01

    The paper examines how country tax differences affect a multinational enterprise's choice to centralize or de-centralize its decision structure. Within a simple model that emphasizes the multiple conflicting roles of transfer prices in MNEs - here, as a strategic pre-commitment device and a tax...... manipulation instrument -, we show that (de-)centralized decisions are more profitable when tax differentials are (small) large.Keywords: Centralized vs. de-centralized decisions, taxes, MNEs.JEL-Classification: H25, F23, L23....

  20. Central centrifugal cicatricial alopecia.

    Science.gov (United States)

    Whiting, David A; Olsen, Elise A

    2008-01-01

    A progressive scarring alopecia of the central scalp is commonly seen in young to middle-aged females of African descent. It usually starts at the vertex or mid top of the scalp and gradually spreads centrifugally, hence, the unifying term of central centrifugal cicatricial alopecia. The clinical pattern is suggestive of female pattern alopecia, but a lack of follicular pores indicative of scarring is present. It can progress for years before slowly burning out. The etiology is unknown but genetic factors may be important. It is often associated with a history of traumatic hairstyling involving heat, traction, and chemicals. However, most patients of African descent without this disorder have similar styling habits. Nonetheless, avoidance of physical and chemical trauma to the scalp hair, the use of suitable shampoos and conditioners, and the encouragement of natural hairstyles may be helpful. Any infection should be treated. Topical or intralesional corticosteroids and systemic antibiotics may be useful and topical minoxidil should be tried with the hope of preventing further scarring and encouraging regrowth of recovering follicles. Current research into the etiology of this disorder will help to foster much-needed clinical trials of therapeutic agents.

  1. Central Sumatra enjoys success

    Energy Technology Data Exchange (ETDEWEB)

    Wongsosantiko, A.

    1977-05-02

    The Sihapas group contains the most prolific oil producing zones in the Central Sumatra Basin. It represents the transgressive, coarse clastic sequence deposited during the early Miocene. Some of these sandstone grade laterally into siltstones and shales of the Telisa Formation, believed to be a major source of rock for Central Sumatra oil. Recent exploratory wells drilled between the mountain front and coastal plain areas have provided more data for stratigraphic studies. These have resulted in subdivision of the lower Miocene transgressive sequence into discrete rock-stratigraphic units. The former Sihapas Formation has subsequently been elevated to group rank and now consists of several formations with the Duri Formation as the uppermost sand unit. This study covers Caltex's areas of operation, which includes the area between the Kampar River of the south, the Barumum River to the north, the Malacca Straits to the east, and the Barisan Mt. to the west. A basic map shows the regional scene, while a stratigraphic chart shows the lithology.

  2. en los pivotes centrales

    Directory of Open Access Journals (Sweden)

    Reynaldo Roque Rodés

    2005-01-01

    Full Text Available Se hace una revisión y comentarios sobre las ventajas y limitantes del empleo del LEPA (Low Enery Precision Aplication en los sistemas de riego de pivotes centrales. Estos sistemas o filosofía de manejo del agua para condiciones de escasez o mala calidad del líquido es una alternativa viable para la producción de alimentos. Introducida en la década del 80 en las planicies del sur de Texas, donde la alta evaporación del agua y la necesidad de regar grandes áreas con pivotes centrales obligaba a la búsqueda de una alternativa para incrementar al máximo la eficiencia de aplicación del riego. Aún en fase de estudio e introducción en Cuba para áreas específicas, puede ser una solución de incremento de los rendimientos de los cultivos, empleando menos agua y aguas con calidad limitada

  3. STUDY CONCERNING THE ASSESSMENT AND EVALUATION OF HUMAN FACTOR IN S.C. HIDROELECTRICA S.A., CURTEA DE ARGEȘ

    Directory of Open Access Journals (Sweden)

    SECARĂ CARMEN-GABRIELA

    2014-08-01

    Full Text Available The assessment of professional performance is a delicate problem in the organization management. When it comes to training, payment or promotion, all these operations only take place following an assessment. The purpose of the assessment is to assist in making decisions that affect individuals, which decisions should have an objective and fair basis. The need for this activity is dictated by: the expression and sizing of the objectives, setting deviations from the objectives and making the necessary corrections, determining the directions and methods for the refresher training of the staff, decreasing the risks r caused by retaining and promoting incompetent persons, a better assignment of the employees on positions, fair salaries, increasing the competitive capacity of the organization. All these are explicit functions of the performance assessment, but there are also implicit reasons. Assessment is an activity through which employees are motivated, personal contacts are maintained, high-quality work is recognised, and a certain image of the assessed employee is promoted.[2] Knowing then performance achieved involves an understanding of how tasks are fulfilled, the yield at the workplace. Knowing performance offers the assessed person self-confidence, and is also a mobilizing factor that generates a positive attitude towards work.

  4. Centrality Measures in Urban Networks

    CERN Document Server

    Crucitti, P; Porta, S; Crucitti, Paolo; Latora, Vito; Porta, Sergio

    2005-01-01

    Centrality has revealed crucial for understanding the structural order of complex relational networks. Centrality is also relevant for various spatial factors affecting human life and behaviors in cities. We present a comprehensive study of centrality distributions over geographic networks of urban streets. Four different measures of centrality, namely closeness, betweenness, straightness and information, are compared over eighteen 1-square-mile samples of different world cities. Samples are represented by primal geographic graphs, i.e. valued graphs defined by metric rather than topologic distance where intersections are turned into nodes and streets into edges. The spatial behavior of centrality indexes over the networks is investigated graphically by means of colour-coded maps. The results indicate that a spatial analysis, that we term Multiple Centrality Assessment(MCA), grounded not a single but on a set of different centrality indices, allows an extended comprehension of the city structure, nicely captu...

  5. Orden monetario y bancos centrales Monetary order and Central Banks

    Directory of Open Access Journals (Sweden)

    Aglietta Michel

    1996-06-01

    Full Text Available Con el enfoque evolucionista e institucionalista de la economía de las convenciones francesa, este trabajo analiza el surgimiento histórico de la banca central y la creación institucional del 'arte de la banca central'. El artículo estudia los modelos formales del orden monetario, la banca libre y la banca central, y analiza los eventos históricos que llevaron a que el Banco de Inglaterra inventara el arte de manejar los bancos centrales en conjunción con el aprendizaje colectivo e institucional que lo hizo posible. Aglietta muestra que la banca central no es una creación del Estado sino una creación institucional endógena al sistema de mercado.With the evolutionist and institutionalist focus of the economics of the French conventions, this paper analyzes the historical rise of the central bank and the institutional creation of the 'art of the central bank'. The article studies formal models of the monetary order, free banking and the central bank, and analyzes the historie events that led to the Bank of England inventing the art of managing the central banks, in conjunction with the collective and institutional learning that made it possible. Aglietta shows that the central bank is not a creation of the State, but rather aninstitutional creation endogenous to the market system.

  6. UA1 central detector

    CERN Multimedia

    The UA1 central detector was crucial to understanding the complex topology of proton-antiproton events. It played a most important role in identifying a handful of Ws and Zs among billions of collisions. The detector was a 6-chamber cylindrical assembly 5.8 m long and 2.3 m in diameter, the largest imaging drift chamber of its day. It recorded the tracks of charged particles curving in a 0.7 Tesla magnetic field, measuring their momentum, the sign of their electric charge and their rate of energy loss (dE/dx). Atoms in the argon-ethane gas mixture filling the chambers were ionised by the passage of charged particles. The electrons which were released drifted along an electric field shaped by field wires and were collected on sense wires. The geometrical arrangement of the 17000 field wires and 6125 sense wires allowed a spectacular 3-D interactive display of reconstructed physics events to be produced.

  7. UA2 central calorimeter

    CERN Multimedia

    The UA2 central calorimeter measured the energy of individual particles created in proton-antiproton collisions. Accurate calibration allowed the W and Z masses to be measured with a precision of about 1%. The calorimeter had 24 slices like this one, each weighing 4 tons. The slices were arranged like orange segments around the collision point. Incoming particles produced showers of secondary particles in the layers of heavy material. These showers passed through the layers of plastic scintillator, generating light which was taken by light guides (green) to the data collection electronics. The amount of light was proportional to the energy of the original particle. The inner 23 cm of lead and plastic sandwiches measured electrons and photons; the outer 80 cm of iron and plastic sandwiches measured strongly interacting hadrons. The detector was calibrated by injecting light through optical fibres or by placing a radioactive source in the tube on the bottom edge.

  8. Central Disorders of Hypersomnolence

    Science.gov (United States)

    Khan, Zeeshan

    2015-01-01

    The central disorders of hypersomnolence are characterized by severe daytime sleepiness, which is present despite normal quality and timing of nocturnal sleep. Recent reclassification distinguishes three main subtypes: narcolepsy type 1, narcolepsy type 2, and idiopathic hypersomnia (IH), which are the focus of this review. Narcolepsy type 1 results from loss of hypothalamic hypocretin neurons, while the pathophysiology underlying narcolepsy type 2 and IH remains to be fully elucidated. Treatment of all three disorders focuses on the management of sleepiness, with additional treatment of cataplexy in those patients with narcolepsy type 1. Sleepiness can be treated with modafinil/armodafinil or sympathomimetic CNS stimulants, which have been shown to be beneficial in randomized controlled trials of narcolepsy and, quite recently, IH. In those patients with narcolepsy type 1, sodium oxybate is effective for the treatment of both sleepiness and cataplexy. Despite these treatments, there remains a subset of hypersomnolent patients with persistent sleepiness, in whom alternate therapies are needed. Emerging treatments for sleepiness include histamine H3 antagonists (eg, pitolisant) and possibly negative allosteric modulators of the gamma-aminobutyric acid-A receptor (eg, clarithromycin and flumazenil). PMID:26149554

  9. [MANAGEMENT OF CENTRAL HYPERSOMNIAS].

    Science.gov (United States)

    Dauvilliers, Yves; Lopez, Régis

    2016-06-01

    Central hypersomnias include narcolepsy type 1, type 2 and idiopathic hypersomnia with daytime sleepiness excessive in the foreground of the clinical symptoms. Despite major advances in our understanding of the mechanisms of the narcolepsy type 1 with a low level of hypocretin-1 in cerebrospinal fluid, its current management is only symptomatic. The current management is also only symptomatic for type 2 narcolepsy and idiopathic hypersomnia with an unknown pathophysiology. Treatment options may vary from a single drug targeting several symptoms or several drugs treating a specific symptom. The treatment of daytime sleepiness is based on modafinil in first intention. Other psychostimulants such as methylphenidate, pitolisant and exceptionally dextro-amfetamine may be considered. In narcolepsy type 1, antidepressants such as inhibitors of the reuptake of serotonin and noradrenaline will be considered to improve cataplexy. Sodium oxybate is an effective treatment on sleepiness, cataplexy and bad night sleep in narcolepsy. The management for other symptoms or comorbidities should be considered it necessary such as hallucinations, sleep paralysis, the disturbed nighttime sleep, unpleasant dreams, parasomnias, depressive symptoms, overweight/obesity, cardiovascular disease and obstructive sleep apnea syndrome. Important therapeutic perspectives are to be expected concerning new psychostimulant and anticataplectiques, but mainly on immune-based therapies administered as early as possible after disease onset and on hypocretin replacement therapy for patients with severe symptoms.

  10. y Banca Central

    Directory of Open Access Journals (Sweden)

    Ángel García Banchs

    2008-01-01

    Full Text Available Las teorías monetarias modernas, ortodoxas y heterodoxas, han pasado por alto el hecho de que posterior a la Segunda Guerra Mundial el mundo quedó dividido entre economías emisoras y receptoras de reservas, pasando el sistema monetario internacional desde entonces a ser completamente asimétrico. De allí que, desde el punto de vista teórico, señalemos la necesidad de tomar en cuenta si las economías emiten o no una moneda de reserva internacional, pues ello explicaría la existencia de diversas prácticas monetarias a nivel mundial. Este trabajo propone, y calcula, indicadores basados en datos provenientes de los balances de activos y pasivos de quince bancos centrales pertenecientes a Norteamérica, Suramérica, Europa y Asia. Los hallazgos con respecto a las diversas estructuras de activos y pasivos confirman la hipótesis acerca de la presencia de tales asimetrías. Se infiere en consecuencia que la política monetaria es menos flexible pero más influyente en las economías receptoras de reservas, y a la vez más flexible pero menos influyente en las economías emisoras. En pocas palabras, la exogeneidad de la tasa de interés de corto plazo es más débil en el caso de las economías receptoras de reservas las cuales se ven obligadas a acumular divisas y a procurar la estabilidad del tipo de cambio, debido a que sus monedas locales no son aceptadas en el exterior. Así, aunque la oferta crediticia es endógena en esas economías, las mismas no han sido capaces de librarse aún de la necesidad de mantener reservas monetarias en divisas extranjeras

  11. Dublin South Central (DSC)

    LENUS (Irish Health Repository)

    O'Gorman, Clodagh S M

    2010-12-01

    Children who appear healthy, even if they have one or more recognized cardiovascular risk factors, do not generally have outcomes of cardiovascular or other vascular disease during childhood. Historically, pediatric medicine has not aggressively screened for or treated cardiovascular risk factors in otherwise healthy children. However, studies such as the P-Day Study (Pathobiological Determinants of Atherosclerosis in Youth), and the Bogalusa Heart Study, indicate that healthy children at remarkably young ages can have evidence of significant atherosclerosis. With the increasing prevalence of pediatric obesity, can we expect more health problems related to the consequences of pediatric dyslipidemia, hypertriglyceridemia, and atherosclerosis in the future? For many years, medications have been available and used in adult populations to treat dyslipidemia. In recent years, reports of short-term safety of some of these medications in children have been published. However, none of these studies have detailed long-term follow-up, and therefore none have described potential late side-effects of early cholesterol-lowering therapy, or potential benefits in terms of reduction of or delay in cardiovascular or other vascular end-points. In 2007, the American Heart Association published a scientific statement on the use of cholesterol-lowering therapy in pediatric patients. In this review paper, we discuss some of the current literature on cholesterol-lowering therapy in children, including the statins that are currently available for use in children, and some of the cautions with using these and other cholesterol-lowering medications. A central tenet of this review is that medications are not a substitute for dietary and lifestyle interventions, and that even in children on cholesterol-lowering medications, physicians should take every opportunity to encourage children and their parents to make healthy diet and lifestyle choices.

  12. Central African Republic.

    Science.gov (United States)

    1989-11-01

    The Central African Republic contains 242,000 square miles, which rolling terrain almost 2000 feet above sea level. The climate is tropical, and it has a population of 2.8 million people with a 2.5% growth rate. There are more than 80 ethnic groups including Baya 34%, Banda 28%, Sara 10%, Mandja 9%, Mboum 9%, and M'Baka 7%. The religions are traditional African 35%, protestant 25%, Roman Catholic 25%, and Muslim 15%, and the languages are French and Sangho. The infant mortality rate is 143/1000, with expectancy at 49 years and a 40% literacy rate. The work force of 1 million is 70% agricultural, industry 6% and commerce and service 6% and government 3%. The government consists of a president assisted by cabinet ministers and a single party. Natural resources include diamonds, uranium, timber, gold, and oil, and major industries are beverages, textiles, and soap. Agricultural products feature coffee, cotton, peanuts, tobacco, food crops and livestock. Most of the population live in rural areas and most of the 80 ethnic groups have their own language. This is one of the world's least developed countries, with a per capita income of $375/year. The main problems with development are the poor transportation infrastructure, and the weak internal and international marketing systems. The US and various international organizations have aided in agriculture development, health programs, and family planning. US investment is mainly in diamond and gold mining, and although oil drilling has been successful it is not economically feasible at current prices.

  13. Central Hypothyroidism in Miniature Schnauzers

    NARCIS (Netherlands)

    Voorbij, Annemarie M W Y; Leegwater, Peter A J; Buijtels, Jenny J C W M; Daminet, Sylvie; Kooistra, Hans S

    2016-01-01

    BACKGROUND: Primary hypothyroidism is a common endocrinopathy in dogs. In contrast, central hypothyroidism is rare in this species. OBJECTIVES: The objective of this article is to describe the occurrence and clinical presentation of central hypothyroidism in Miniature Schnauzers. Additionally, the p

  14. Central presbycusis: an emerging view.

    Science.gov (United States)

    Gates, George A

    2012-07-01

    Age-related dysfunction of the central auditory system (central presbycusis) is common but rarely looked for by those who provide aural rehabilitation. Patients who complain of difficulty hearing in noise--the key symptom of central presbycusis--are generally disadvantaged with conventional rehabilitation. This symptom should be documented with commercially available speech-in-noise tests, which use materials that are uncomplicated to administer. Those patients who perform poorly on such tests should have a customized rehabilitation program aimed at optimizing their remaining communication abilities. Otolaryngologists who provide auditory rehabilitation may wish to consider expanding their practices to meet the communication needs of older patients with central presbycusis. Central presbycusis is an emerging area for basic and clinical research in auditory neurotology, particularly in the relation of cognitive dysfunction to impaired auditory processing.

  15. Centralized versus Decentralized Information Systems

    Science.gov (United States)

    Hugoson, Mats-Åke

    This paper brings into question whether information systems should be centralized or decentralized in order to provide greater support for different business processes. During the last century companies and organizations have used different approaches for centralization and decentralization; a simple answer to the question does not exist. This paper provides a survey of the evolution of centralized and decentralized approaches, mainly in a Nordic perspective. Based on critical reflections on the situation in the end of the century we can discuss what we can learn from history to achieve alignment between centralized and decentralized systems and the business structure. The conclusion is that theories, management and practice for decisions on centralization or decentralization of information systems must be improved. A conscious management and control of centralization /decentralization of IT support is a vital question in the company or the organization, and this is not a task that can be handled only by IT-specialists. There is a need for business oriented IT management of centralization/decentralization.

  16. Betweenness centrality profiles in trees

    CERN Document Server

    Fish, Benjamin; Turan, Gyorgy

    2016-01-01

    Betweenness centrality of a vertex in a graph measures the fraction of shortest paths going through the vertex. This is a basic notion for determining the importance of a vertex in a network. The k-betweenness centrality of a vertex is defined similarly, but only considers shortest paths of length at most k. The sequence of k-betweenness centralities for all possible values of k forms the betweenness centrality profile of a vertex. We study properties of betweenness centrality profiles in trees. We show that for scale-free random trees, for fixed k, the expectation of k-betweenness centrality strictly decreases as the index of the vertex increases. We also analyze worst-case properties of profiles in terms of the distance of profiles from being monotone, and the number of times pairs of profiles can cross. This is related to whether k-betweenness centrality, for small values of k, may be used instead of having to consider all shortest paths. Bounds are given that are optimal in order of magnitude. We also pre...

  17. Demographic tensions in Central America.

    Science.gov (United States)

    1986-08-01

    This discussion of Central America focuses on the rapid growth of its population, its stagnating economy, and those countries that are socioeconomically advanced. Between 1950-85 the population of Central America tripled, from 9.1 million to 26. 4 million, due to marked mortality declines and the absence of off-setting fertility declines. The distribution of Central Americas's growing populations sets its population growth apart from that of other developing regions. Currently, almost half of all Central Americans live in cities. Although the average growth rate for Central American countries has fallen and is expected to drop further, the decline does not counterbalance the effect of the absolute rise in population numbers. The average annual growth rate of more than 3% annually in the 1960s fell to about 2.6% in recent years, but this decline is due primarily to socioeconomically advanced Costa Rica and Panama. Central America's age structure further complicates the population crisis. About 43% of Central Americans are under the age of 15. When the increasingly larger young population group enters it reproductive years, the potential for future growth (albeit the falling rate of population increase) is unparalleled. UN population projections show the region's population at 40 million by the year 2000. The 1973 oil crisis began a downward spiral for the buoyant post World War II Central American economy. Between 1950-79, real per capita income growth in Central America doubled, with Central American economies growing an average of 5.3% annually. By the early 1980s, overseas markets of the trade-dependent countries of Central America had dried up due to protectionism abroad and slumping basic commodity prices. These and other factors plunged Central America into its current economic malaise of falling real per capita income, rising unemployment, curtailed export led economic growth, and a rising cost of living. In general, economic growth in Central America

  18. The Central Trigger Processor (CTP)

    CERN Multimedia

    Franchini, Matteo

    2016-01-01

    The Central Trigger Processor (CTP) receives trigger information from the calorimeter and muon trigger processors, as well as from other sources of trigger. It makes the Level-1 decision (L1A) based on a trigger menu.

  19. Payments and Central Bank Policy

    DEFF Research Database (Denmark)

    Korsgaard, Søren

    This thesis consists of three chapters. The rst, "Paying for Payments", examines the role of interchange fees in payment card networks. The second, "Bank Liquidity and the Interbank Market" (co-authored with Mikael Reimer Jensen), investigates how banks' liquidity holdings at the central bank a ect...... outcomes in the money market. The third, "Collateralized Lending and Central Bank Collateral Policy", considers the emergence of credit constraints under collateralized lending, and how central banks use collateral policy to mitigate these constraints. While the chapters can be read independently......, they share common themes. Each chapter is concerned with payments in one way or another, each is concerned with the e ciency of market outcomes, and, to the extent that there is scope for improving these outcomes, each discusses the appropriate role for policy, in particular central bank policy....

  20. Central cementifying fibroma of mandible

    Directory of Open Access Journals (Sweden)

    Joseph Edward

    2010-01-01

    Full Text Available Central cementifying fibroma is a rare non odontogenic tumor coming in the group of fibro osseouslesion, arising from periodontal ligament and is usually seen in tooth bearing area. It can affect boththe mandible and the maxilla, particularly the mandible. This bone tumour consists of highly cellular,fibrous tissue that contains varying amounts of calcified tissue resembling bone, cementum or both.Here we present a case of Central cementifying fibroma (recurrent in a 34 year old female.

  1. Inferring Centrality from Network Snapshots

    OpenAIRE

    Haibin Shao; Mehran Mesbahi; Dewei Li; Yugeng Xi

    2017-01-01

    The topology and dynamics of a complex network shape its functionality. However, the topologies of many large-scale networks are either unavailable or incomplete. Without the explicit knowledge of network topology, we show how the data generated from the network dynamics can be utilised to infer the tempo centrality, which is proposed to quantify the influence of nodes in a consensus network. We show that the tempo centrality can be used to construct an accurate estimate of both the propagati...

  2. CENTRAL PLATEAU REMEDIATION OPTIMIZATION STUDY

    Energy Technology Data Exchange (ETDEWEB)

    BERGMAN, T. B.; STEFANSKI, L. D.; SEELEY, P. N.; ZINSLI, L. C.; CUSACK, L. J.

    2012-09-19

    THE CENTRAL PLATEAU REMEDIATION OPTIMIZATION STUDY WAS CONDUCTED TO DEVELOP AN OPTIMAL SEQUENCE OF REMEDIATION ACTIVITIES IMPLEMENTING THE CERCLA DECISION ON THE CENTRAL PLATEAU. THE STUDY DEFINES A SEQUENCE OF ACTIVITIES THAT RESULT IN AN EFFECTIVE USE OF RESOURCES FROM A STRATEGIC PERSPECTIVE WHEN CONSIDERING EQUIPMENT PROCUREMENT AND STAGING, WORKFORCE MOBILIZATION/DEMOBILIZATION, WORKFORCE LEVELING, WORKFORCE SKILL-MIX, AND OTHER REMEDIATION/DISPOSITION PROJECT EXECUTION PARAMETERS.

  3. Controlling centrality in complex networks

    CERN Document Server

    Nicosia, Vincenzo; Romance, Miguel; Russo, Giovanni; Latora, Vito

    2011-01-01

    Spectral centrality measures allow to identify influential individuals in social groups, to rank Web pages by their popularity, and even to determine the impact of scientific researches. The centrality score of a node within a network crucially depends on the entire pattern of connections, so that the usual approach is to compute the node centralities once the network structure is assigned. We face here with the inverse problem, that is, we study how to modify the centrality scores of the nodes by acting on the structure of a given network. We prove that there exist particular subsets of nodes, called controlling sets, which can assign any prescribed set of centrality values to all the nodes of a graph, by cooperatively tuning the weights of their out-going links. We show that many large networks from the real world have surprisingly small controlling sets, containing even less than 5-10% of the nodes. These results suggest that rankings obtained from spectral centrality measures have to be considered with ex...

  4. Rosette Central Configurations, Degenerate central configurations and bifurcations

    CERN Document Server

    Lei, Jinzhi

    2009-01-01

    In this paper we find a class of new degenerate central configurations and bifurcations in the Newtonian $n$-body problem. In particular we analyze the Rosette central configurations, namely a coplanar configuration where $n$ particles of mass $m_1$ lie at the vertices of a regular $n$-gon, $n$ particles of mass $m_2$ lie at the vertices of another $n$-gon concentric with the first, but rotated of an angle $\\pi/n$, and an additional particle of mass $m_0$ lies at the center of mass of the system. This system admits two mass parameters $\\mu=m_0/m_1$ and $\\ep=m_2/m_1$. We show that, as $\\mu$ varies, if $n> 3$, there is a degenerate central configuration and a bifurcation for every $\\ep>0$, while if $n=3$ there is a bifurcations only for some values of $\\epsilon$.

  5. Coverage centralities for temporal networks

    CERN Document Server

    Takaguchi, Taro; Yoshida, Yuichi

    2015-01-01

    Structure of real networked systems, such as social relationship, can be modeled as temporal networks in which each edge appears only at the prescribed time. Understanding the structure of temporal networks requires quantifying the importance of a temporal vertex, which is a pair of vertex index and time. In this paper, we define two centrality measures of a temporal vertex by the proportion of (normal) vertex pairs, the quickest routes between which can (or should) use the temporal vertex. The definition is free from parameters and robust against the change in time scale on which we focus. In addition, we can efficiently compute these centrality values for all temporal vertices. Using the two centrality measures, we reveal that distributions of these centrality values of real-world temporal networks are heterogeneous. For various datasets, we also demonstrate that a majority of the highly central temporal vertices are located within a narrow time window around a particular time. In other words, there is a bo...

  6. Coverage centralities for temporal networks*

    Science.gov (United States)

    Takaguchi, Taro; Yano, Yosuke; Yoshida, Yuichi

    2016-02-01

    Structure of real networked systems, such as social relationship, can be modeled as temporal networks in which each edge appears only at the prescribed time. Understanding the structure of temporal networks requires quantifying the importance of a temporal vertex, which is a pair of vertex index and time. In this paper, we define two centrality measures of a temporal vertex based on the fastest temporal paths which use the temporal vertex. The definition is free from parameters and robust against the change in time scale on which we focus. In addition, we can efficiently compute these centrality values for all temporal vertices. Using the two centrality measures, we reveal that distributions of these centrality values of real-world temporal networks are heterogeneous. For various datasets, we also demonstrate that a majority of the highly central temporal vertices are located within a narrow time window around a particular time. In other words, there is a bottleneck time at which most information sent in the temporal network passes through a small number of temporal vertices, which suggests an important role of these temporal vertices in spreading phenomena. Contribution to the Topical Issue "Temporal Network Theory and Applications", edited by Petter Holme.Supplementary material in the form of one pdf file available from the Journal web page at http://dx.doi.org/10.1140/epjb/e2016-60498-7

  7. Inferring Centrality from Network Snapshots

    Science.gov (United States)

    Shao, Haibin; Mesbahi, Mehran; Li, Dewei; Xi, Yugeng

    2017-01-01

    The topology and dynamics of a complex network shape its functionality. However, the topologies of many large-scale networks are either unavailable or incomplete. Without the explicit knowledge of network topology, we show how the data generated from the network dynamics can be utilised to infer the tempo centrality, which is proposed to quantify the influence of nodes in a consensus network. We show that the tempo centrality can be used to construct an accurate estimate of both the propagation rate of influence exerted on consensus networks and the Kirchhoff index of the underlying graph. Moreover, the tempo centrality also encodes the disturbance rejection of nodes in a consensus network. Our findings provide an approach to infer the performance of a consensus network from its temporal data. PMID:28098166

  8. CENTRAL MECHANISMS OF ACUPUNCTURE ANALGESIA

    Directory of Open Access Journals (Sweden)

    Eman S. Mansour

    2015-12-01

    Full Text Available Background: Acupuncture is an component of traditional Chinese medicine (TCM that has been used for three thousand years to treat diseases and relieve pain. Pain is found to be the most common reason for people to use acupuncture. Due to recent scientific findings, acupuncture treatment has been accepted worldwide. Numerous trials have been conducted especially in analgesia. The mechanisms of acupuncture analgesia has been widely investigated, however, the underlying mechanism still not clear. This article summarizes the central mechanisms of acupuncture analgesia and reviews recent studies on the topic. Method: We have focused on examining the recent literature on acupuncture analgesia. The central mechanisms of acupuncture analgesia and reviews recent studies on the topic. We focused on the studies related to central mechanisms of acupuncture analgesia from these aspects: (neurophysiology, neurochemistry and neuroanatomy. Result: The result revealed that acupuncture act on various parts of the central nervous system, including the spinal cord, brain stem, cerebral ganglia and cerebral cortex to alleviate pain. The central mechanisms underlying the effects of acupuncture include neurohumors and neurotransmitters, which are involved in analgesia. At spinal level, Spinal opioids, glutamate, norepinephrine and serotonin are the key elements acupuncture-induced analgesia. At brain level, Endogenous opioid peptides, limbic system play essential roles in mediating the analgesia. Conclusion: Acupuncture is an effective approach to pain management. There is good evidence in both experimental and clinical research that supports acupuncture efficacy in management of chronic pain through central nervous system. Acupuncture should be strongly used as a part of pain management plans. This work helps in improving our understanding of the scientific basis underlying acupuncture analgesia.

  9. Central Stars of Planetary Nebulae

    CERN Document Server

    Jones, David

    2016-01-01

    In this brief invited review, I will attempt to summarise some of the key areas of interest in the study of central stars of planetary nebulae which (probably) won't be covered by other speakers' proceedings. The main focus will, inevitably, be on the subject of multiplicity, with special emphasis on recent results regarding triple central star systems as well as wide binaries which avoid a common-envelope phase. Furthermore, in light of the upcoming release of Kepler's Campaign 11 data, I will discuss a few of the prospects from that data including the unique possibility to detect merger products.

  10. Central Libraries in Uncertain Times.

    Science.gov (United States)

    Kenney, Brian J.

    2001-01-01

    Discusses security and safety issues for public libraries, especially high-profile central facilities, in light of the September 11 terrorist attacks. Highlights include inspecting bags as patrons enter as well as exit; the need for security guidelines for any type of disaster or emergency; building design; and the importance of communication.…

  11. New Economy, Old Central Banks?

    NARCIS (Netherlands)

    Berk, Jan Marc

    2002-01-01

    Proponents of the so-called New Economy claim that it entails a structural change of the economy. Such a change, in turn, would require the central bank to rethink its monetary policy to the extent that traditional relationships between inf1ation and economic growth are no longer valid. But such a r

  12. Vulnerability in north- central Vietnam

    DEFF Research Database (Denmark)

    Casse, Thorkil; Milhøj, Anders; Nguyen, Thao Phuong

    2015-01-01

    This article examines changes in livelihood strategies in response to flooding. It does so on the basis of a household survey which was undertaken in three provinces in north central Vietnam. All households in the survey were regularly affected by flooding, but only poor households experience...

  13. Water Governance in Central Asia

    NARCIS (Netherlands)

    Djanibekov, Nodir; Assche, Van Kristof; Valentinov, Vladislav

    2016-01-01

    We develop a social systems theory perspective on Central Asian post-Socialist transition, placing particular emphasis on the coordination problems in transboundary water governance. The extensive Soviet water-energy infrastructure around the Amudarya and Syrdarya rivers required coordination, bu

  14. The Centrality of Ethical Leadership

    Science.gov (United States)

    Ehrich, Lisa C.; Harris, Jessica; Klenowski, Val; Smeed, Judy; Spina, Nerida

    2015-01-01

    Purpose: The central argument in this paper is that ethical school leadership is imperative in a context of increasing performance-driven accountability. The purpose of this paper is to focus on school principals' perceptions of how they understand ethical leadership and how they lead the ethical use of data. Design/Methodology/Approach: This…

  15. Learning and the central bank

    OpenAIRE

    Charles T. Carlstrom; Timothy S. Fuerst

    2001-01-01

    It is well known that sunspot equilibria may arise under an interest-rate operating procedure in which the central bank varies the nominal rate with movements in future inflation (a forward-looking Taylor rule). This paper demonstrates that these sunspot equilibria may be learnable in the sense of E-stability.

  16. The MEANING multilingual central repository

    NARCIS (Netherlands)

    Atserias, J.; Villarejo, L.; Rigau, G.; Agirre, E.; Carroll, J.; Magnini, B.; Vossen, P.

    2004-01-01

    This paper describes the first version of the Multilingual Central Repository, a lexical knowledge base developed in the framework of the MEANING project. Currently the MCR integrates into the EuroWordNet framework five local wordnets (including four versions of the English WordNet from Princeton),

  17. Copycats of the Central Himalayas

    NARCIS (Netherlands)

    P.A. Arora (Payal)

    2009-01-01

    textabstractThis case study highlights practices of a rarely documented group of neo-users of the Internet or newbies from Central Himalayas, serving as a catalyst for delving deeply into the act of ‘plagiarism’ in online learning By looking at such ‘learning’ practices away from schools, namely at

  18. Reduced central blood volume in cirrhosis

    DEFF Research Database (Denmark)

    Henriksen, Jens Henrik; Bendtsen, Flemming; Sørensen, T I

    1989-01-01

    for measuring the central blood volume. We have developed a method that enables us to determine directly the central blood volume, i.e., the blood volume in the heart cavities, lungs, and central arterial tree. In 60 patients with cirrhosis and 16 control subjects the central blood volume was assessed according...

  19. 27 CFR 9.75 - Central Coast.

    Science.gov (United States)

    2010-04-01

    ... 27 Alcohol, Tobacco Products and Firearms 1 2010-04-01 2010-04-01 false Central Coast. 9.75... Central Coast. (a) Name. The name of the viticultural area described in this section is “Central Coast.” (b) Approved maps. The approved maps for determining the boundary of the Central Coast...

  20. Central venous line complications and tip detection

    OpenAIRE

    Ameneh Rezaee Gheshlaghi; Hamid Zamani Moghadam Dolu; Elham Pishbin; Maryam Salehi

    2015-01-01

    Central venous line is one of a creative instrument that saves human’s life in critical medical situation. Central venous line access is frequently involved in the disease management. It is used for rapid fluid therapy, transvenous pacemakers, infusion of some medications, hemodialysis or plasmapheresis and etc. Most of the emergency departments have some staffs that are trained for central venous line insertion but related complications occur during central venous line placement.Central veno...

  1. Is Central Asia really exsiccating?

    Science.gov (United States)

    Aizen, V. B.; Aizen, E. M.; Surazakov, A. B.

    2008-12-01

    At the end of 20th and the beginning of 21st century central Asia oases suffered from serious drought caused lack of water for agriculture, economy growth and population increase. However, people of this region always experienced lack of water for irrigation and fought a war over the rights to control river streams. The drying up of central Asian rivers is not a new phenomenon according to the ancient manuscripts. Thus, lets see about what has happened with the past century climate and water resources of central Asia using the long-term observational data. We analyzed data from more than 200 meteorological stations and stream gauges over the central Asia in elevation range from 25 m. b.s.l. to 4,000 m. a.s.l. to understand the last 100 years variability in climate and water resources, examining changes in the extreme and mean monthly air temperatures, precipitation and river runoff. The evaluation of seasonal snow and glacier's covered areas between 1970th and 2007th in central Asia derived from AVHRR, MODIS, Hexagon KH-9, Landsat ETM and ASTER data exhibit 15% reduction of the seasonal snow covered area and 10.1% of the glacier area. It has been found that during last twenty years the duration of snowmelt, from the date of maximum snow cover to date of its disappearance, reduced by 30 days and in 2007 was equal to 138 days in the central Asian mountains. The decrease of seasonal snow cover is not a linear process. The further decrease may be accelerated due to increase of rainfall instead of snowfall in early spring months at high elevations, and consequently a lesser heat expenditure for the snowmelt. The growth in summer air temperatures, especially observable since the 1970th, accompanied by increase of evapotranspiration and precipitation, notably in summer and autumn, and at high elevations over 3,000 m, and at the western peripheral mountain ridges. Average difference in the means of annual air temperatures for the two thirty-year periods before and after

  2. The Central Valley Hydrologic Model

    Science.gov (United States)

    Faunt, C.; Belitz, K.; Hanson, R. T.

    2009-12-01

    Historically, California’s Central Valley has been one of the most productive agricultural regions in the world. The Central Valley also is rapidly becoming an important area for California’s expanding urban population. In response to this competition for water, a number of water-related issues have gained prominence: conjunctive use, artificial recharge, hydrologic implications of land-use change, subsidence, and effects of climate variability. To provide information to stakeholders addressing these issues, the USGS made a detailed assessment of the Central Valley aquifer system that includes the present status of water resources and how these resources have changed over time. The principal product of this assessment is a tool, referred to as the Central Valley Hydrologic Model (CVHM), that simulates surface-water flows, groundwater flows, and land subsidence in response to stresses from human uses and from climate variability throughout the entire Central Valley. The CVHM utilizes MODFLOW combined with a new tool called “Farm Process” to simulate groundwater and surface-water flow, irrigated agriculture, land subsidence, and other key processes in the Central Valley on a monthly basis. This model was discretized horizontally into 20,000 1-mi2 cells and vertically into 10 layers ranging in thickness from 50 feet at the land surface to 750 feet at depth. A texture model constructed by using data from more than 8,500 drillers’ logs was used to estimate hydraulic properties. Unmetered pumpage and surface-water deliveries for 21 water-balance regions were simulated with the Farm Process. Model results indicate that human activities, predominately surface-water deliveries and groundwater pumping for irrigated agriculture, have dramatically influenced the hydrology of the Central Valley. These human activities have increased flow though the aquifer system by about a factor of six compared to pre-development conditions. The simulated hydrology reflects spatial

  3. Centrality in Interconnected Multilayer Networks

    CERN Document Server

    De Domenico, Manlio; Omodei, Elisa; Gómez, Sergio; Arenas, Alex

    2013-01-01

    Real-world complex systems exhibit multiple levels of relationships. In many cases, they require to be modeled by interconnected multilayer networks, characterizing interactions on several levels simultaneously. It is of crucial importance in many fields, from economics to biology, from urban planning to social sciences, to identify the most (or the less) influent nodes in a network. However, defining the centrality of actors in an interconnected structure is not trivial. In this paper, we capitalize on the tensorial formalism, recently proposed to characterize and investigate this kind of complex topologies, to show how several centrality measures -- well-known in the case of standard ("monoplex") networks -- can be extended naturally to the realm of interconnected multiplexes. We consider diagnostics widely used in different fields, e.g., computer science, biology, communication and social sciences, to cite only some of them. We show, both theoretically and numerically, that using the weighted monoplex obta...

  4. Centralized versus Decentralized Infrastructure Networks

    CERN Document Server

    Hines, Paul D H; Schläpfer, Markus

    2015-01-01

    While many large infrastructure networks, such as power, water, and natural gas systems, have similar physical properties governing flows, these systems tend to have distinctly different sizes and topological structures. This paper seeks to understand how these different size-scales and topological features can emerge from relatively simple design principles. Specifically, we seek to describe the conditions under which it is optimal to build decentralized network infrastructures, such as a microgrid, rather than centralized ones, such as a large high-voltage power system. While our method is simple it is useful in explaining why sometimes, but not always, it is economical to build large, interconnected networks and in other cases it is preferable to use smaller, distributed systems. The results indicate that there is not a single set of infrastructure cost conditions under which optimally-designed networks will have highly centralized architectures. Instead, as costs increase we find that average network size...

  5. A centralized audio presentation manager

    Energy Technology Data Exchange (ETDEWEB)

    Papp, A.L. III; Blattner, M.M.

    1994-05-16

    The centralized audio presentation manager addresses the problems which occur when multiple programs running simultaneously attempt to use the audio output of a computer system. Time dependence of sound means that certain auditory messages must be scheduled simultaneously, which can lead to perceptual problems due to psychoacoustic phenomena. Furthermore, the combination of speech and nonspeech audio is examined; each presents its own problems of perceptibility in an acoustic environment composed of multiple auditory streams. The centralized audio presentation manager receives abstract parameterized message requests from the currently running programs, and attempts to create and present a sonic representation in the most perceptible manner through the use of a theoretically and empirically designed rule set.

  6. The CDF Central Analysis Farm

    Energy Technology Data Exchange (ETDEWEB)

    Kim, T.H.; /MIT; Neubauer, M.; /UC, San Diego; Sfiligoi, I.; /Frascati; Weems, L.; /Fermilab; Wurthwein, F.; /UC, San Diego

    2004-01-01

    With Run II of the Fermilab Tevatron well underway, many computing challenges inherent to analyzing large volumes of data produced in particle physics research need to be met. We present the computing model within CDF designed to address the physics needs of the collaboration. Particular emphasis is placed on current development of a large O(1000) processor PC cluster at Fermilab serving as the Central Analysis Farm for CDF. Future plans leading toward distributed computing and GRID within CDF are also discussed.

  7. Central Nucleon-Nucleon Potential

    Science.gov (United States)

    Robilotta, M. R.

    2001-12-01

    The outer region of the NN interactions is dominated by the one pion exchange potential (OPEP), followed by the two-pion exchange potential (TPEP). Chiral calculations of the TPEP have been performed using either heavy baryon1 (HB) or relativistic2 perturbation theories. We compare the predictions from these two approaches for the dominant central interaction and show that they fail to agree by 25% ...

  8. Celtic Sites of Central Iberia

    Science.gov (United States)

    Pérez Gutiérrez, Manuel

    This chapter concerns the astronomy practiced by Celtic peoples in some parts of central Iberia, specifically the Vetton and Celtiberian peoples, inhabitants of the so-called Late Iron Age. The construction of some elements of religion or worship was perfectly determined by geometry, topography, and especially astronomy, because their spatial orientation occurs in locations of great interest for maintaining the local calendar. The maintenance of this calendar was probably the primary objective of some of the elements studied.

  9. Information from the central stores

    CERN Multimedia

    GS Department

    2010-01-01

    All items sold in the CERN shop (Bldg. 33) are now available in the central stores (Bldg. 73) and can be purchased on-line via EDH “Material Request” or at the “Emergency Desk” of the stores on the ground floor of Bldg. 73. These items are visible in the CERN catalogue under the “SCEM” codes beginning with 92. Department of General Infrastructure Services (GS) GS-SEM Group

  10. Central Asia, Physical Geography Handbook.

    Science.gov (United States)

    2007-11-02

    over 2,000 m) is not applicable to Central Asia, partly because the general hypsometric level of this region is high and unstable, as a consequence of...organic fossils in them, gastropods have been discovered. On the main territory of the Tarim massif, which evidently represented a weakly elevated...places seams of gypsum and rock salt, and, in a part to the west of the town of Aksu, also a bed of gray limestone with small fresh- water gastropods

  11. Central charges in regular mechanics

    CERN Document Server

    Cabo-Montes de Oca, Alejandro; Villanueva, V M

    1997-01-01

    We consider the algebra associated to a group of transformations which are symmetries of a regular mechanical system (i.e. system free of constraints). For time dependent coordinate transformations we show that a central extension may appear at the classical level which is coordinate and momentum independent. A cochain formalism naturally arises in the argument and extends the usual configuration space cochain concepts to phase space.

  12. Central hypersensitivity in chronic musculoskeletal pain.

    Science.gov (United States)

    Curatolo, Michele; Arendt-Nielsen, Lars

    2015-05-01

    Clinical research has consistently detected alteration in central pain processing leading to hypersensitivity. Most methods used in humans are reliable and have face validity to detect widespread central hypersensitivity. However, construct validity is difficult to investigate due to lack of gold standards. Reference values in the pain-free population have been generated, but need replication. Research on pain biomarkers that reflect specific central hypersensitivity processes is warranted. Few studies have analyzed the prognostic value of central hypersensitivity. Most medications acting at central level and some non-pharmacological approaches, including psychological interventions, are likely to attenuate central hypersensitivity.

  13. Central hypersensitivity in chronic musculoskeletal pain

    DEFF Research Database (Denmark)

    Curatolo, Michele; Arendt-Nielsen, Lars

    2015-01-01

    Clinical research has consistently detected alteration in central pain processing leading to hypersensitivity. Most methods used in humans are reliable and have face validity to detect widespread central hypersensitivity. However, construct validity is difficult to investigate due to lack of gold...... standards. Reference values in the pain-free population have been generated, but need replication. Research on pain biomarkers that reflect specific central hypersensitivity processes is warranted. Few studies have analyzed the prognostic value of central hypersensitivity. Most medications acting at central...... level and some non-pharmacological approaches, including psychological interventions, are likely to attenuate central hypersensitivity....

  14. CHINA AND ENERGY SECURITY IN CENTRAL ASIA

    OpenAIRE

    Guang, Pan

    2007-01-01

    This paper is divided into three parts: China’s energy policy and energy development strategy; Central Asia’s significance for China’s overseas energy development strategy; and Central Asia’s energy security and energy development.

  15. [Historical demography in the Central American isthmus].

    Science.gov (United States)

    Perez Brignoli, H

    1980-01-01

    The author reviews and evaluates sources of information on the demographic history of Central America. Past and present administrative, state, ecclesiastical, and genealogical sources are examined, and recent studies of various Central American countries are cited. A bibliography is provided

  16. Puente del Pedrido, tramo central

    Directory of Open Access Journals (Sweden)

    Torroja, Eduardo

    1962-02-01

    Full Text Available Planteada la necesidad de proceder a la ejecución del tramo central del puente en el Pasaje del Pedrido sobre la ría de Betanzos, y encontrándonos con que las armaduras para el mismo, que ya estaban acopiadas a pie de obra antes de la guerra, estaban totalmente no tuvimos inconveniente, puesto que habían de adquirirse de nuevo, en introducir algunas ligeras modificaciones sobre el proyecto anterior, a fin de reducir en lo posible el coste de la obra.

  17. Nonlocally Centralized Simultaneous Sparse Coding

    Institute of Scientific and Technical Information of China (English)

    雷阳; 宋占杰

    2016-01-01

    The concept of structured sparse coding noise is introduced to exploit the spatial correlations and nonlo-cal constraint of the local structure. Then the model of nonlocally centralized simultaneous sparse coding(NC-SSC)is proposed for reconstructing the original image, and an algorithm is proposed to transform the simultaneous sparse coding into reweighted low-rank approximation. Experimental results on image denoisng, deblurring and super-resolution demonstrate the advantage of the proposed NC-SSC method over the state-of-the-art image resto-ration methods.

  18. Inverting the central limit theorem

    CERN Document Server

    Navascues, Miguel; Villanueva, Ignacio

    2011-01-01

    The central limit theorem states that the sum of N independently distributed n-tuples of real variables (subject to appropriate normalization) tends to a multivariate gaussian distribution for large N. Here we propose to invert this argument: given a set of n correlated gaussian variables, we try to infer information about the structure of the discrete microscopic probability distributions whose convolution generated such a macroscopic behavior. The techniques developed along the article are applied to prove that the classical description of certain macroscopic optical experiments is infinitely more complex than the quantum one.

  19. Kalmanovitz y la banca central.

    OpenAIRE

    Maya M, Guillermo

    2011-01-01

    Salomón Kalmanovitz, Codirector del Banco de la República (B de la R) hasta enero de 2005, uno de los economistas colombianos más brillantes, publicó un libro titulado Ensayos sobre Banca Central, Comportamiento, Independencia e Historia (Norma, 2003). Si los estudiantes de economía de los años 70 y 80 estudiaron a un Kalmanovitz marxista, los estudiantes de hoy estudian a un economista ortodoxo y liberal, igualmente brillante. Kalmanovitz es un partidario de la independencia de la BC para la...

  20. Distributed trace using central performance counter memory

    Science.gov (United States)

    Satterfield, David L.; Sexton, James C.

    2013-01-22

    A plurality of processing cores, are central storage unit having at least memory connected in a daisy chain manner, forming a daisy chain ring layout on an integrated chip. At least one of the plurality of processing cores places trace data on the daisy chain connection for transmitting the trace data to the central storage unit, and the central storage unit detects the trace data and stores the trace data in the memory co-located in with the central storage unit.

  1. Capitalizing Central Banks: A Net Worth Approach

    OpenAIRE

    Alain Ize

    2005-01-01

    This paper provides a simple, quantitative, net worth-based, approach to assessing the need for central bank capital. It derives a concept of "core capital" (a function of the central bank's operating expenditures and the carrying cost of its international reserves) as the minimum capital needed by a central bank to ensure the credibility of its inflation target. The approach is illustrated with the published accounts of three loss-making central banks and selected accounting entries for a br...

  2. The European Central Bank and the Eurosystem

    OpenAIRE

    Carol C. Bertaut

    2002-01-01

    The Eurosystem comprises the European Central Bank at its center as well as the national central banks of the twelve countries currently participating in monetary union. The European Central Bank was established in July 1998, six months before the beginning of Stage Three of economic and monetary union. Although decisions regarding monetary policy are made centrally by the Governing Council of the Eurosystem, the operational aspects of monetary policy-including open market operations, adminis...

  3. Legal and actual central bank independence

    OpenAIRE

    Artha, I.K.D.S.; de Haan, J.

    2010-01-01

    Indicators of central bank independence (CBI) based on the interpretation central bank laws in place may not capture the actual independence of the central bank. This paper develops an indicator of actual independence of the Bank Indonesia (BI), the central bank of Indonesia, for the period 1953-2008 and compares it with a new legal CBI indicator based on Cukierman (1992). The indicator of actual independence captures institutional and economic factors that affect CBI. We find that before 199...

  4. Central Pontine Myelinolysis: Report of Four Cases

    Directory of Open Access Journals (Sweden)

    Handan Akar

    2010-09-01

    Full Text Available Central pontine myelinolysis is a neurological disorder characterized by loss of myelin in the central pons as well as in the other parts of the brain like basal ganglia, lateral geniculate bodies, external and internal capsules, and cerebellum. We report the clinical and radiological findings of three patients with central pontine myelinolysis and one patient with both pontine and extrapontine myelinolysis.

  5. Central bank independence and inflation revisited

    NARCIS (Netherlands)

    Klomp, Jeroen; de Haan, Jakob

    2010-01-01

    We re-examine the relationship between central bank independence (CBI), proxied by the central bank governor's turnover rate and an indicator based on central bank laws in place, and inflation using a random coefficient model with the Hildreth-Houck estimator for more than 100 countries in the perio

  6. "Christofest" New Yorgi Central Parkis / Rael Artel

    Index Scriptorium Estoniae

    Artel, Rael, 1980-

    2004-01-01

    12. II 2005. a. avatakse Christo ja Jeanne-Claude'i keskkonnainstallatsioon "The Gates" New Yorgi Central Parkis. Paralleelselt toimub Metropolitan Muuseumis näitus "Christo and Jeanne-Claude : The Gates, Central Park, New York", kus eksponeeritakse Central Parki installatsiooni ettevalmistavaid materjale: joonistusi, diagramme, fotosid jne

  7. Precipitation chemistry in central Amazonia

    Science.gov (United States)

    Andreae, M. O.; Talbot, R. W.; Berresheim, H.; Beecher, K. M.

    1990-01-01

    Rain samples from three sites in central Amazonia were collected over a period of 6 weeks during the 1987 wet season and analyzed for ionic species and dissolved organic carbon. A continuous record of precipitation chemistry and amount was obtained at two of these sites, which were free from local or regional pollution, for a time period of over 1 month. The volume-weighted mean concentrations of most species were found to be about a factor of 5 lower during the wet season compared with previous results from the dry season. Only sodium, potassium, and chloride showed similar concentrations in both seasons. When the seasonal difference in rainfall amount is taken into consideration, the deposition fluxes are only slightly lower for most species during the wet season than during the dry season, again with the exception of chloride, potassium, and sodium. Sodium and chloride are present in the same ratio as in sea salt; rapid advection of air masses of marine origin to the central Amazon Basin during the wet season may be responsible for the observed higher deposition flux of these species. Statistical analysis suggests that sulfate is, to a large extent, of marine (sea salt and biogenic) origin, but that long-range transport of combustion-derived aerosols also makes a significant contribution to sulfate and nitrate levels in Amazonian rain. Organic acid concentrations in rain were responsible for a large fraction of the observed precipitation acidity; their concentration was strongly influenced by gas/liquid interactions.

  8. Glial involvement in trigeminal central sensitization

    Institute of Scientific and Technical Information of China (English)

    Yu-feng XIE

    2008-01-01

    Recent studies have indicated that trigeminal neurons exhibit central sensitization, an increase in the excitability of neurons within the central nervous system to the extent that a normally innocuous stimulus begins to produce pain after inflamma-tion or injury, and that glial activities play a vital role in this central sensitization. The involvement of glial cells in trigeminal central sensitization contains multiple mechanisms, including interaction with glutamatergic and purinergic receptors. A better understanding of the trigeminal central sensitization mediated by glial cells will help to find potential therapeutic targets and lead to developing new analge-sics for orofacial-specific pain with higher efficiency and fewer side-effects.

  9. Central Solenoid Insert Technical Specification

    Energy Technology Data Exchange (ETDEWEB)

    Martovetsky, Nicolai N [ORNL; Smirnov, Alexandre [ORNL

    2011-09-01

    The US ITER Project Office (USIPO) is responsible for the ITER central solenoid (CS) contribution to the ITER project. The Central Solenoid Insert (CSI) project will allow ITER validation the appropriate lengths of the conductors to be used in the full-scale CS coils under relevant conditions. The ITER Program plans to build and test a CSI to verify the performance of the CS conductor. The CSI is a one-layer solenoid with an inner diameter of 1.48 m and a height of 4.45 m between electric terminal ends. The coil weight with the terminals is approximately 820 kg without insulation. The major goal of the CSI is to measure the temperature margin of the CS under the ITER direct current (DC) operating conditions, including determining sensitivity to load cycles. Performance of the joints, ramp rate sensitivity, and stability against thermal or electromagnetic disturbances, electrical insulation, losses, and instrumentation are addressed separately and therefore are not major goals in this project. However, losses and joint performance will be tested during the CSI testing campaign. The USIPO will build the CSI that will be tested at the Central Solenoid Model Coil (CSMC) Test Facility at the Japan Atomic Energy Agency (JAEA), Naka, Japan. The industrial vendors (the Suppliers) will report to the USIPO (the Company). All approvals to proceed will be issued by the Company, which in some cases, as specified in this document, will also require the approval of the ITER Organization. Responsibilities and obligations will be covered by respective contracts between the USIPO, called Company interchangeably, and the industrial Prime Contractors, called Suppliers. Different stages of work may be performed by more than one Prime Contractor, as described in this specification. Technical requirements of the contract between the Company and the Prime Contractor will be covered by the Fabrication Specifications developed by the Prime Contractor based on this document and approved by

  10. 76 FR 22746 - Wiregrass Central Railway, LLC-Acquisition and Operation Exemption-Wiregrass Central Railroad...

    Science.gov (United States)

    2011-04-22

    ... Surface Transportation Board Wiregrass Central Railway, LLC--Acquisition and Operation Exemption--Wiregrass Central Railroad Company, Inc. Wiregrass Central Railway, LLC (WCR), a noncarrier, has filed a verified notice of exemption under 49 CFR 1150.31 to acquire from Wiregrass Central Railroad Company,...

  11. Central Exclusive Production at LHCb

    CERN Document Server

    McNulty, Ronan

    2016-01-01

    Central Exclusive Production (CEP) is a unique process at hadron machines in which particles are produced via colourless propagators. LHCb have measured the cross-sections for the CEP of vector mesons, $J/\\psi,\\psi(2S),\\Upsilon(1S),\\Upsilon(2S)$ and $\\Upsilon(3S)$, which are photo-produced. In the double pomeron exchange process, preliminary measurements have been made of $\\chi_{c0},\\chi_{c1}, \\chi_{c2}$ meson production while the first observations of the CEP of pairs of charmonia, $J/\\psi J/\\psi$ and $J/\\psi \\psi(2S)$, have been made and limits obtained on the pair production of other charmonia.

  12. Centralized Allocation in Multiple Markets

    DEFF Research Database (Denmark)

    Monte, Daniel; Tumennasan, Norovsambuu

    The problem of allocating indivisible objects to different agents, where each indi vidual is assigned at most one object, has been widely studied. Pápai (2000) shows that the set of strategy-proof, nonbossy, Pareto optimal and reallocation-proof rules are hierarchical exchange rules | generalizat......The problem of allocating indivisible objects to different agents, where each indi vidual is assigned at most one object, has been widely studied. Pápai (2000) shows that the set of strategy-proof, nonbossy, Pareto optimal and reallocation-proof rules are hierarchical exchange rules...... | generalizations of Gale's Top Trading Cycles mechanism. We study the centralized allocation that takes place in multiple markets. For example, the assignment of multiple types of indivisible objects; or the assignment of objects in successive periods. We show that the set of strategy-proof, Pareto efficient...

  13. CST-01-Central Standard Timing

    Institute of Scientific and Technical Information of China (English)

    2013-01-01

    薄如蝉翼名为CentralStandardTiming的工作室推出了E—ink材质代号为CST-01的手表,其厚度仅为0.8mm,号称全球最薄。一次充电10分钟便可连续使用15年。该手表屏幕由多层柔性材料构成。整体十分轻巧并且可弯曲,腕带则采用了柔性不锈钢材质。CST-01的预售价格为129美元。约合人民币800元,目前已经在著名的集资网站Kickstarter上创建项目。

  14. Banco Central de Costa Rica

    Directory of Open Access Journals (Sweden)

    Sauter, Franz

    1963-06-01

    Full Text Available This new building is intended to house the various services of the Central Bank of Costa Rica. It has a prestressed concrete structure, and consists of a basement parking space for 105 vehicles, and nine storeys, providing altogether a floor surface of 12,000 ms2. The building rests on a ground area of 40 by 60 ms, and the main structure occupies 22 by 45 ms. This Bank is located in a district of narrow streets, but its main side overlooks a green open space, which will improve its visibility and appearance. The building structure is made up of a framework of prestressed beams and columns. The beams have been concreted at the site, and the joists, which are also prestressed, are factory made. This framework, at each floor level, constitutes the basis of a continuous slab, which renders the total structure exceedingly stiff. The main continuous girders span 11.22 ms spaces, and vary in cross section. The prestressing reinforcements consist of 6 Loeba type cables. This is an original design by Dr. Leonhardt, in which the cables are placed on three horizontal layers, of parabolic outline. Each cable is made up of 12 x 5.4 mm wires, with a breaking stress of 180 kg/mm2 The tensioning stress was 108 kg/mm2, and the total prestress load is 29,700 kgs. The cables run in corrugated metal tubes, and these were kept in precise position with the aid of distance pieces.El nuevo edificio, destinado a agrupar los servicios del Banco Central de Costa Rica, está constituido por una estructura de hormigón pretensado. El inmueble dispone de un sótano, estacionamiento propio para 105 vehículos y nueve plantas, con una superficie total de 12.000 metros cuadrados. Se asienta sobre una base de 40x60 m, donde se levanta un núcleo central de 22x45 metros. Está situado en un barrio de calles estrechas, pero tiene su fachada, principal frente a una zona verde que le proporcionará mayor categoría y visibilidad. La estructura se compone de una retícula de vigas

  15. ITER Central Solenoid Module Fabrication

    Energy Technology Data Exchange (ETDEWEB)

    Smith, John [General Atomics, San Diego, CA (United States)

    2016-09-23

    The fabrication of the modules for the ITER Central Solenoid (CS) has started in a dedicated production facility located in Poway, California, USA. The necessary tools have been designed, built, installed, and tested in the facility to enable the start of production. The current schedule has first module fabrication completed in 2017, followed by testing and subsequent shipment to ITER. The Central Solenoid is a key component of the ITER tokamak providing the inductive voltage to initiate and sustain the plasma current and to position and shape the plasma. The design of the CS has been a collaborative effort between the US ITER Project Office (US ITER), the international ITER Organization (IO) and General Atomics (GA). GA’s responsibility includes: completing the fabrication design, developing and qualifying the fabrication processes and tools, and then completing the fabrication of the seven 110 tonne CS modules. The modules will be shipped separately to the ITER site, and then stacked and aligned in the Assembly Hall prior to insertion in the core of the ITER tokamak. A dedicated facility in Poway, California, USA has been established by GA to complete the fabrication of the seven modules. Infrastructure improvements included thick reinforced concrete floors, a diesel generator for backup power, along with, cranes for moving the tooling within the facility. The fabrication process for a single module requires approximately 22 months followed by five months of testing, which includes preliminary electrical testing followed by high current (48.5 kA) tests at 4.7K. The production of the seven modules is completed in a parallel fashion through ten process stations. The process stations have been designed and built with most stations having completed testing and qualification for carrying out the required fabrication processes. The final qualification step for each process station is achieved by the successful production of a prototype coil. Fabrication of the first

  16. Performance contracting in central government in Denmark

    DEFF Research Database (Denmark)

    Kristiansen, Mads Bøge

    2015-01-01

    in organisational structure, tasks, culture and time with performance contracts is expected to affect the contract content, hypotheses on variation across agencies are deduced. The empirical basis of the paper is a study of all performance contracts between parent ministries and subordinate agencies in Danish......This paper looks into performance contracting in Danish central government. Management by Objectives and Results (MBOR) was adopted in central government in Denmark during the 1980s and early 1990s. In 1991, performance contracts between parent ministries and their agencies were introduced...... in Danish central government. Since their introduction, performance contracts have become central elements in the steering and management of agencies in central government in Denmark, and today they are nearly universally adopted in central government. In Denmark, the Ministry of Finance is responsible...

  17. Hirsch index as a network centrality measure

    CERN Document Server

    Campiteli, Monica G; Soles, Paulo R C; Soares, Leonardo H D; Kinouchi, Osame

    2010-01-01

    We study the h Hirsch index as a local node centrality measure for complex networks in general. The h index is compared with the Degree centrality (a local measure), the Betweenness and Eigenvector centralities (two non-local measures) in the case of a biological network (Yeast interaction protein-protein network) and a linguistic network (Moby Thesaurus II) as test environments. In both networks, the Hirsch index has poor correlation with Betweenness centrality but correlates well with Eigenvector centrality, specially for the more important nodes that are relevant for ranking purposes, say in Search Machine Optimization. In the thesaurus network, the h index seems even to outperform the Eigenvector centrality measure as evaluated by simple linguistic criteria.

  18. A matrix analysis of different centrality measures

    CERN Document Server

    Benzi, Michele

    2013-01-01

    Node centrality measures including degree, eigenvector, Katz and subgraph centralities are analyzed for both undirected and directed networks. We show how parameter-dependent measures, such as Katz and subgraph centrality, can be "tuned" to interpolate between degree and eigenvector centrality, which appear as limiting cases of the other measures. We interpret our finding in terms of the local and global influence of a given node in the graph as measured by graph walks of different length through that node. Our analysis gives some guidance for the choice of parameters in Katz and subgraph centrality, and provides an explanation for the observed correlations between different centrality measures and for the stability exhibited by the ranking vectors for certain parameter ranges. The important role played by the spectral gap of the adjacency matrix is also highlighted.

  19. Reduced central blood volume in cirrhosis

    DEFF Research Database (Denmark)

    Bendtsen, F; Henriksen, Jens Henrik Sahl; Sørensen, T I

    1989-01-01

    for measuring the central blood volume. We have developed a method that enables us to determine directly the central blood volume, i.e., the blood volume in the heart cavities, lungs, and central arterial tree. In 60 patients with cirrhosis and 16 control subjects the central blood volume was assessed according......The pathogenesis of ascites formation in cirrhosis is uncertain. It is still under debate whether the effective blood volume is reduced (underfilling theory) or whether the intravascular compartment is expanded (overflow theory). This problem has not yet been solved because of insufficient tools...... to the kinetic theory as the product of cardiac output and mean transit time of the central vascular bed. Central blood volume was significantly smaller in patients with cirrhosis than in controls (mean 21 vs. 27 ml/kg estimated ideal body weight, p less than 0.001; 25% vs. 33% of the total blood volume, p less...

  20. Market strategies for Central American dry beans.

    OpenAIRE

    Mertínez, Lourdes; Bernsten, Richard; Zamora, Miguel

    2004-01-01

    In the past few years, the dry bean sub-sector in CentralAmerica has witnessed many dynamic changes. Unless wefind ways to increase the competitiveness of the regionalbean sub-sector, Central American countries will likelyexperience significant negative social and economic impacts,especially since these countries are facing the challenge ofadjusting to new open markets, such as the Central AmericanFree Trade Agreement (CAFTA). Bean traders, retailers, andknowledgeable government official in C...

  1. Transpleural central venous catheter discovered during thoracotomy

    Directory of Open Access Journals (Sweden)

    Ashima Malhotra

    2014-01-01

    Full Text Available We report an uncommon complication of subclavian central venous catheterization, discovered at thoracotomy. The central venous catheter (CVC was placed by left infraclavicular route after induction of general anesthesia. CVC was secured after aspiration of blood and satisfactory central venous tracing. On thoracotomy, CVC was noticed to traverse the pleural cavity while the tracing was normal. CVC was thus removed consequent to which bleeding from each puncture site was noticed, that were secured surgically.

  2. The Centrality of Organization Design

    Directory of Open Access Journals (Sweden)

    Raymond E. Miles

    2012-05-01

    Full Text Available I am excited about this new journal focused on the subject of organization design. In my view, organization design is a central issue in the field of management. Designing an organization requires an understanding of strategy, as we pointed out some time ago (Miles & Snow, 1978. For example, if you want to be a prospector (a first-mover strategy, you have to design your firm to move quickly in new directions, which is likely to require that it be arranged so that various kinds of teams can interact across organizational units and levels. Designing an organization to follow a first-mover strategy also requires both an understanding of leadership and a commitment to the free flow of information throughout the organization. Leaders must understand how cross-functional teams pursue ideas and opportunities, and they must facilitate collaborative knowledge sharing to drive innovations that help the firm operate entrepreneurially. Because an organization is a complex, dynamic system, perhaps no other single topic is so deeply implanted at the core of management, organization theory, and organizational behavior as organization design. Moreover, organization design once was, and could be again, the topic of an ongoing dialogue between managers and academics focused on business organizations.

  3. Maximal switchability of centralized networks

    Science.gov (United States)

    Vakulenko, Sergei; Morozov, Ivan; Radulescu, Ovidiu

    2016-08-01

    We consider continuous time Hopfield-like recurrent networks as dynamical models for gene regulation and neural networks. We are interested in networks that contain n high-degree nodes preferably connected to a large number of N s weakly connected satellites, a property that we call n/N s -centrality. If the hub dynamics is slow, we obtain that the large time network dynamics is completely defined by the hub dynamics. Moreover, such networks are maximally flexible and switchable, in the sense that they can switch from a globally attractive rest state to any structurally stable dynamics when the response time of a special controller hub is changed. In particular, we show that a decrease of the controller hub response time can lead to a sharp variation in the network attractor structure: we can obtain a set of new local attractors, whose number can increase exponentially with N, the total number of nodes of the nework. These new attractors can be periodic or even chaotic. We provide an algorithm, which allows us to design networks with the desired switching properties, or to learn them from time series, by adjusting the interactions between hubs and satellites. Such switchable networks could be used as models for context dependent adaptation in functional genetics or as models for cognitive functions in neuroscience.

  4. Central nervous system tuberculosis: MRI

    Energy Technology Data Exchange (ETDEWEB)

    Kioumehr, F.; Dadsetan, M.R.; Rooholamini, S.A.; Au, A.

    1994-02-01

    The MRI findings of 18 proven cases of central nervous system (CNS) tuberculosis were reviewed; 10 patients were seropositive for HIV. All had medical, laboratory, or surgical proof of CNS tuberculosis. Eleven patients had meningitis, of whom two also had arachnoiditis. Five patients had focal intra-axial tuberculomas: four brain masses and one an intramedullary spinal lesion. Two patients had focal extra-axial tuberculomas: one in the pontine cistern, and one in the spine. In all 11 patients with meningitis MRI showed diffuse, thick, meningeal enhancement. All intraparenchymal tuberculomas showed low signal intensity on T2-weighted images and ring or nodular enhancement. The extra-axial tuberculomas had areas isointense or hypointense relative to normal brain and spinal cord on T2-weighted images. Although tuberculous meningitis cannot be differentiated from other meningitides on the basis of MR findings, intraparenchymal tuberculomas show characteristic T2 shortening, not found in most other space-occupying lesions. In the appropriate clinical setting, tuberculoma should be considered. (orig.)

  5. Towards a centralized Grid Speedometer

    Energy Technology Data Exchange (ETDEWEB)

    Dzhunov, I. [CERN; Andreeva, J. [CERN; Fajardo, E.; Gutsche, O.; Luyckx, S.; Saiz, P. [CERN

    2014-01-01

    Given the distributed nature of the Worldwide LHC Computing Grid and the way CPU resources are pledged and shared around the globe, Virtual Organizations (VOs) face the challenge of monitoring the use of these resources. For CMS and the operation of centralized workflows, the monitoring of how many production jobs are running and pending in the Glidein WMS production pools is very important. The Dashboard Site Status Board (SSB) provides a very flexible framework to collect, aggregate and visualize data. The CMS production monitoring team uses the SSB to define the metrics that have to be monitored and the alarms that have to be raised. During the integration of CMS production monitoring into the SSB, several enhancements to the core functionality of the SSB were required, They were implemented in a generic way, so that other VOs using the SSB can exploit them. Alongside these enhancements, there were a number of changes to the core of the SSB framework. This paper presents the details of the implementation and the advantages for current and future usage of the new features in SSB.

  6. Towards a centralized Grid Speedometer

    CERN Document Server

    Gutsche, Oliver

    2013-01-01

    Given the distributed nature of the grid and the way CPU resources are pledged and scared around the globe, VOs are facing the challenge to monitor the use of these resources. For CMS and the operation of centralized workflows the monitoring of how many production jobs are running and pending in the Glidein WMS production pools is very important. The Dashboard SSB (Site Status Board) provides a very flexible framework to collect, aggregate and visualize data. The CMS production monitoring team uses the SSB to define the metrics that have to be monitored and the alarms that have to be set. During the integration of the CMS production monitoring into the SSB, several enhancements to the core functionality of the SSB were implemented; all in a generic way, so that other VOs using the SSB can use them as well. Alongside these enhancements, there were a few changes to the core of the SSB framework from which the CMS production team was able to benefit. We will present the details of the implementation and the adva...

  7. [Aniseikonia of central serous chorioretinopathy].

    Science.gov (United States)

    Hisada, H; Awaya, S

    1992-03-01

    Central serous chorioretinopathy (CRS) is one of the typical diseases that accompany micropsia. However very little is known about micropsia of CRS, because of the difficulty to measure "aniseikonia" in terms of micropsia. Aniseikonia in 65 cases of CRS was measured quantitatively by Awaya's New Aniseikonia Tests (NAT). The tests were performed at two different distances of 40 cm (visual angle: 6 degrees) and 20 cm (12 degrees) and under 4 meridians of the halfmoon on NAT, horizontal, 45 degrees, vertical and 135 degrees, respectively. The mean value of aniseikonia under each testing condition was as follows: 6 degrees horizontal -3.13%, 45 degrees -2.56%, vertical -2.13%, 135 degrees -2.57%, 12 degrees; horizontal -1.38%, 45 degrees -1.69%, vertical -1.84%, 135 degrees -1.50%. At 6 degrees aniseikonia is larger in the horizontal meridian than in the vertical with statistical significance (t-test, p less than 0.05), while at 12 degrees aniseikonia is smaller than at 6 degrees and shows no particular tendency in terms of meridian. The phenomenon observed at 6 degrees may be what is called "oriented metamorphopsia".

  8. Concept of the central clip

    DEFF Research Database (Denmark)

    Alegria-Barrero, Eduardo; Chan, Pak Hei; Foin, Nicolas

    2014-01-01

    -risk surgical population with severe mitral regurgitation (MR). METHODS AND RESULTS: Patients with severe MR (3 or 4+) and high operative risk (as defined by logistic EuroSCORE) refused for conventional mitral valve repair were considered for MitraClip(®). The procedure was performed under general anaesthesia...... with transoesophageal echocardiographic (TOE) guidance. Device success was defined as placement of one or more MitraClips(®) with a reduction of MR to ≤2+. Patients were followed up clinically and with TOE at one month and one year. From September 2009 to March 2012, 43 patients with severe MR with a mean age of 74.......8±10.7 years (30 males, 13 females; mean logistic EuroSCORE 24.1±11, mean LVEF 47.5±18.5%; mean±SD) were treated. Median follow-up was 385 days (104-630; Q1-Q3). Device implantation success was 93%. All patients were treated following the central clip concept: 52.5% of MR was degenerative in aetiology and 47...

  9. Central venous line complications and tip detection

    Directory of Open Access Journals (Sweden)

    Ameneh Rezaee Gheshlaghi

    2015-06-01

    Full Text Available Central venous line is one of a creative instrument that saves human’s life in critical medical situation. Central venous line access is frequently involved in the disease management. It is used for rapid fluid therapy, transvenous pacemakers, infusion of some medications, hemodialysis or plasmapheresis and etc. Most of the emergency departments have some staffs that are trained for central venous line insertion but related complications occur during central venous line placement.Central venous line might have some complications and complication follow-up should be considered. Thromboembolism and infection are two important medical complications. Arterial puncture, hematoma, pneumothorax and hemothorax are mechanical Central venous line complications. Chest X-ray and some other techniques should be used for detecting these complications.Central venous line tip misplace is a considerable problem for emergency department staffs, previously chest X-ray has been used for central venous line misplace detection. In some recent studies, contrast-enhanced ultrasonography and intravascular electrocardiography have been used for central venous line misplace.

  10. JPRS Report, Science & Technology. Europe: Economic Competitiveness

    Science.gov (United States)

    2007-11-02

    its partners, the Spanish companies ENDESA [National Electric Power Enterprise, Inc.], Hidroelectrica Espanola, Sevillana de Electricidade ...Hidroelectrica del Cantabrico, and the Electricidade de Portugal Company, the carbon dioxide emissions from the plant will be reduced by 20 percent, as

  11. A global central banker competency model

    Directory of Open Access Journals (Sweden)

    David W. Brits

    2014-02-01

    Full Text Available Orientation: No comprehensive, integrated competency model exists for central bankers. Due to the importance of central banks in the context of the ongoing global financial crisis, it was deemed necessary to design and validate such a model.Research purpose: To craft and validate a comprehensive, integrated global central banker competency model (GCBCM and to assess whether central banks using the GCBCM for training have a higher global influence.Motivation for the study: Limited consensus exists globally about what constitutes a ‘competent’ central banker. A quantitatively validated GCBCM would make a significant contribution to enhancing central banker effectiveness, and also provide a solid foundation for effective people management.Research approach, design and method: A blended quantitative and qualitative research approach was taken. Two sets of hypotheses were tested regarding the relationships between the GCBCM and the training offered, using the model on the one hand, and a central bank’s global influence on the other.Main findings: The GCBCM was generally accepted across all participating central banks globally, although some differences were found between central banks with higher and lower global influence. The actual training offered by central banks in terms of the model, however, is generally limited to technical-functional skills. The GCBCM is therefore at present predominantly aspirational. Significant differences were found regarding the training offered.Practical/managerial implications: By adopting the GCBCM, central banks would be able to develop organisation-specific competency models in order to enhance their organisational capabilities and play their increasingly important global role more effectively.Contribution: A generic conceptual framework for the crafting of a competency model with evaluation criteria was developed. A GCBCM was quantitatively validated.

  12. Haemangiopericytoma of central nervous system

    Energy Technology Data Exchange (ETDEWEB)

    Borg, M.F.; Benjamin, C.S. [Auckland Hospital, Auckland (New Zealand). Dept. of Clinical Oncology

    1995-02-01

    The records of four patients presenting with a histological diagnosis of haemangiopericytoma of the central nervous system, in Auckland, New Zealand, between 1970 and 1990 were reviewed retrospectively, with the aim of determining the natural history of the disease and response to various treatment modalities. Three out of the four patients reviewed presented with primary cerebral disease and the fourth with a primary spinal cord tumour. All three cerebral primary patients were initially treated with local surgical excision. All three patients received radical radiotherapy following local recurrence. The first two patients remained disease-free locally although one patient developed a solitary liver metastasis 5 years after radiotherapy. The third patient was referred with multiple cerebral metastases and failed to respond to radiotherapy. The patient with the primary lesion in the spinal cord was treated with local excision followed by postoperative radiotherapy and remains disease-free 17 years after treatment. One patient failed to respond to chemotherapy, prescribed to treat a local recurrence adjacent to the previous radiotherapy field. This was successfully excised subsequently. The patient presenting with multiple cerebral metastases was the only patient to die of this disease. Results suggest that local recurrence is avoidable with adequate wide excision of the primary tumour followed by local radical radiotherapy. The role of chemotherapy remains controversial and no conclusion could be drawn regarding the role of palliative radiotherapy from this study. Active treatment and long-term follow-up are necessary because of the relative aggressiveness of this disease and the propensity for late relapses. 22 refs., 2 tabs., 6 figs.

  13. Tethyan evolution of central Asia

    Energy Technology Data Exchange (ETDEWEB)

    Sengor, A.M.C. (Instanbul Technical Univ. (Turkey))

    1990-05-01

    The study area extends from the eastern shores of the Caspian Sea in the west to the Helan Shan and Longmen Shan in the east and from about 40{degree}N parallel in the north to the neo-Tethyan sutures in the south, thus including what is called Middle Asia in the Soviet literature. In the region thus delineated lies the boundary between the largely late Paleozoic core of Asia (Altaids) and the Tethyside superorogenic complex. This boundary passes through continental objects that collided with nuclear Asia in the late Paleozoic to terminate its Altaid evolution. Subduction to the south of some of these had commenced before they collided (e.g., Tarim in the Kuen-Lun), in others later (e.g., South Ghissar area west of Pamirs). This subduction 1ed, in the late Paleozoic, to the opening of marginal basins, at least one of which may be partly extant (Tarim). Giant subduction accretion complexes of Paleozoic to earliest Triassic age dominate farther south in the basement of Turan (mainly in Turkmenian SSR) and in the Kuen-Lun/Nan Shan ranges. No discrete continental collisions or any continental basement in these regions could be unequivocally recognized contrary to most current interpretations. Magmatic arcs that developed along the southern margin of Asia in the late Paleozoic to early Mesozoic grew atop these subduction-accretion complexes and record a gradual southerly migration of magmatism through time. Subduction also dominated the northern margin of Gondwanaland between Iran and China in late Paleozoic time, although the record in Afghanistan and northwest Tibet is scrappy. It led to back-arc basin formation, which in Iran and Oman became neo-Tethys and, in at least parts of central Asia, the Waser-Mushan-Pshart/Banggong Co-Nu Jiang ocean. This ocean was probably connected with the Omani part of the neo-Tethys via the Sistan region.

  14. Digital data sets that describe aquifer characteristics of the Central Oklahoma aquifer in central Oklahoma

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This data set consists of digitized polygons of a constant hydraulic conductivity value for the Central Oklahoma aquifer in central Oklahoma. This area encompasses...

  15. Digital data sets that describe aquifer characteristics of the Central Oklahoma aquifer in central Oklahoma

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This data set consists of digitized water-level elevation contours for the Central Oklahoma aquifer in central Oklahoma. This area encompasses all or part of...

  16. Digital data sets that describe aquifer characteristics of the Central Oklahoma aquifer in central Oklahoma

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This data set consists of digitized aquifer boundaries created for a previously published report about the Central Oklahoma aquifer in central Oklahoma. This area...

  17. Digital data sets that describe aquifer characteristics of the Central Oklahoma aquifer in central Oklahoma

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This data set consists of digitized polygons of a constant recharge value for the Central Oklahoma aquifer in central Oklahoma. This area encompasses all or part of...

  18. Novel central nervous system drug delivery systems.

    Science.gov (United States)

    Stockwell, Jocelyn; Abdi, Nabiha; Lu, Xiaofan; Maheshwari, Oshin; Taghibiglou, Changiz

    2014-05-01

    For decades, biomedical and pharmaceutical researchers have worked to devise new and more effective therapeutics to treat diseases affecting the central nervous system. The blood-brain barrier effectively protects the brain, but poses a profound challenge to drug delivery across this barrier. Many traditional drugs cannot cross the blood-brain barrier in appreciable concentrations, with less than 1% of most drugs reaching the central nervous system, leading to a lack of available treatments for many central nervous system diseases, such as stroke, neurodegenerative disorders, and brain tumors. Due to the ineffective nature of most treatments for central nervous system disorders, the development of novel drug delivery systems is an area of great interest and active research. Multiple novel strategies show promise for effective central nervous system drug delivery, giving potential for more effective and safer therapies in the future. This review outlines several novel drug delivery techniques, including intranasal drug delivery, nanoparticles, drug modifications, convection-enhanced infusion, and ultrasound-mediated drug delivery. It also assesses possible clinical applications, limitations, and examples of current clinical and preclinical research for each of these drug delivery approaches. Improved central nervous system drug delivery is extremely important and will allow for improved treatment of central nervous system diseases, causing improved therapies for those who are affected by central nervous system diseases.

  19. Central Life Interests and Job Satisfaction.

    Science.gov (United States)

    Dubin, Robert; And Others

    Data on central life interests (CLI) and five aspects of job satisfaction were obtained in a sample of bluecollar males and two samples of clerical females. Both a multiple discriminant analysis and a bivariate analysis were performed. The results of these analyses showed that central life interest was significantly related to the total set of job…

  20. International Regulation of Central Arctic Ocean Fisheries

    NARCIS (Netherlands)

    Molenaar, E.J.

    2016-01-01

    Due in particular to the impacts of climate change, the adequacy of the international regulation of Central Arctic Ocean fisheries has come under increasing scrutiny in recent years. As shown in this article, however, international regulation of Central Arctic Ocean fisheries is by no means entirely

  1. An unusual Complication of Central Venous Cannulation

    Directory of Open Access Journals (Sweden)

    Ashvini Kumar

    2013-04-01

    Full Text Available Central venous catheter (CVC hub fracture is a rare complication of central venous cannulation. We report a case where catheter hub fracture was detected immediately after CVC insertion. Causes of catheter hub fracture and its complications are discussed.

  2. The Latino Experience in Central Falls

    Science.gov (United States)

    Holland, William R.

    2011-01-01

    Central Falls is, by far, the poorest community in Rhode Island. More than 40 percent of the children under 18 live in poverty, and 40 percent of that group live in severe poverty. At Central Falls High School, low-income Latino students have fallen behind their white counterparts, with shockingly low graduation, poor literacy, and low…

  3. Computing betweenness centrality in external memory

    DEFF Research Database (Denmark)

    Arge, Lars; Goodrich, Michael T.; Walderveen, Freek van

    2013-01-01

    Betweenness centrality is one of the most well-known measures of the importance of nodes in a social-network graph. In this paper we describe the first known external-memory and cache-oblivious algorithms for computing betweenness centrality. We present four different external-memory algorithms...

  4. Traveling Policies: Hijacked in Central Asia

    Science.gov (United States)

    Silova, Iveta

    2005-01-01

    Since the collapse of the Soviet Union, Central Asian education reform discourses have become increasingly similar to distinctive Western policy discourses traveling globally across national boundaries. Tracing the trajectory of "traveling policies" in Central Asia, this article discusses the way Western education discourses have been…

  5. China-Central Asia Power Cooperation Outlook

    Institute of Scientific and Technical Information of China (English)

    Luo

    2010-01-01

    After analyzing the basic information,distribution of energy resources and condition of power industry in Central Asia, the high feasibility for China to cooperate closely with Central Asia in transnational power interconnection, power investment and technology exchanges, etc. is studied. Furthermore, the forms, mechanisms, existing problems and suggestions for the improvement of current policies related to the power cooperation are proposed.

  6. An overview of CMS central hadron calorimeter

    CERN Document Server

    Katta, S

    2002-01-01

    The central hadron calorimeter for CMS detector is a sampling calorimeter with active medium as scintillator plates interleaved with brass absorber plates. It covers the central pseudorapidity region (¿ eta ¿<3.0). The design and construction aspects are reported. The status of construction and assembly of various subdetectors of HCAL are presented. (5 refs).

  7. The Cartan Matrix of a Centralizer Algebra

    Indian Academy of Sciences (India)

    Umesh V Dubey; Amritanshu Prasad; Pooja Singla

    2012-02-01

    The centralizer algebra of a matrix consists of those matrices that commute with it. We investigate the basic representation-theoretic invariants of centralizer algebras, namely their radicals, projective indecomposable modules, injective indecomposable modules, simple modules and Cartan matrices. With the help of our Cartan matrix calculations we determine their global dimensions. Many of these algebras are of infinite global dimension.

  8. Central bank independence and financial instability

    NARCIS (Netherlands)

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

    2009-01-01

    It has been argued that central bank independence (CBI) may not only be beneficial for reaching the objective of price stability, but also for maintaining financial stability. Greater independence from external pressure implies that central banks are less politically constrained in acting to prevent

  9. A SCALED CENTRAL PATH FOR LINEAR PROGRAMMING

    Institute of Scientific and Technical Information of China (English)

    Ya-xiang Yuan

    2001-01-01

    Interior point methods are very efficient methods for solving large scale linear programming problems. The central path plays a very important role in interior point methods. In this paper we propose a new central path, which scales the variables. Thus it has the advantage of forcing the path to have roughly the same distance from each active constraint boundary near the solution.

  10. Traveling Policies: Hijacked in Central Asia

    Science.gov (United States)

    Silova, Iveta

    2005-01-01

    Since the collapse of the Soviet Union, Central Asian education reform discourses have become increasingly similar to distinctive Western policy discourses traveling globally across national boundaries. Tracing the trajectory of "traveling policies" in Central Asia, this article discusses the way Western education discourses have been hybridized…

  11. Central registry in psychiatry: A structured review

    Directory of Open Access Journals (Sweden)

    Jyoti Prakash

    2014-01-01

    Full Text Available Background: Central registry in psychiatry is being practiced in few countries and has been found useful in research and clinical management. Role of central registry has also expanded over the years. Materials and Methods: All accessible internet database Medline, Scopus, Embase were accessed from 1990 till date. Available data were systematically reviewed in structured manner and analyzed. Results: Central registry was found useful in epidemiological analysis, association studies, outcome studies, comorbidity studies, forensic issue, effective of medication, qualitative analysis etc., Conclusion: Central registry proves to be effective tool in quantitative and qualitative understanding of psychiatry practice. Findings of studies from central registry can be useful in modifying best practice and evidence based treatment in psychiatry.

  12. Central differences, Euler numbers and symbolic methods

    CERN Document Server

    Dowker, J S

    2013-01-01

    I relate some coefficients encountered when computing the functional determinants on spheres to the central differentials of nothing. In doing this I use some historic works, in particular transcribing the elegant symbolic formalism of Jeffery (1861) into central difference form which has computational advantages for Euler numbers, as discovered by Shovelton (1915). I derive sum rules for these, and for the central differentials, the proof of which involves an interesting expression for powers of sech x as multiple derivatives. I present a more general, symbolic treatment of central difference calculus which allows known, and unknown, things to be obtained in an elegant and compact fashion gaining, at no cost, the expansion of the powers of the inverse sinh, a basic central function. Systematic use is made of the operator 2 asinh(D/2). Umbral calculus is employed to compress the operator formalism. For example the orthogonality/completeness of the factorial numbers, of the first and second kinds, translates, ...

  13. Central station market development strategies for photovoltaics

    Science.gov (United States)

    1980-01-01

    Federal market development strategies designed to accelerate the market penetration of central station applications of photovoltaic energy system are analyzed. Since no specific goals were set for the commercialization of central station applications, strategic principles are explored which, when coupled with specific objectives for central stations, can produce a market development implementation plan. The study includes (1) background information on the National Photovoltaic Program, photovoltaic technology, and central stations; (2) a brief market assessment; (3) a discussion of the viewpoints of the electric utility industry with respect to solar energy; (4) a discussion of commercialization issues; and (5) strategy principles. It is recommended that a set of specific goals and objectives be defined for the photovoltaic central station program, and that these goals and objectives evolve into an implementation plan that identifies the appropriate federal role.

  14. Centrality and economic development in the Rijnland region: social and spatial concepts of centrality

    NARCIS (Netherlands)

    Van Nes, A.

    2007-01-01

    In urban research, spatial and social concepts of centrality are being distinguished. From a spatial point of view, metrical centrality implies that something is located in the middle of an area. However, metrical and topological centrality are not equivalent. In research where space syntax methods

  15. The mining engineer as an international consultant; El ingeniero de minas como consultor internacional

    Energy Technology Data Exchange (ETDEWEB)

    Arias, A. M.

    2009-07-01

    These notes are a summary of the lecture I had the honor of giving on 5 May 2009, invited by the Higher Council of Mining Engineers of Spain, in the Engineering Institute of Spain. Interventions that, next to mine, were held that day, were integrated into the framework of an organized cycle, in which the different branches of engineering were encouraged to provide an overview of its current occupation. (Author)

  16. Habilidades matematicas para el buen desempeño del ingeniero

    OpenAIRE

    2010-01-01

    Como se conoce el estudio de las habilidades es un fenómeno que puede centrarse desde distintos ángulos, pero: en este sentido siempre serán insuficientes. La verdadera dimensión de las habilidades es integral, sistemática y compleja. Varios autores como (Fariñas, 1995, Labarrere, 1997) han comprendido la real dimensión de las habilidades y las estudian en los tres planos de análisis que revelan la multiplicidad de la persona que aprende. Por su parte Alberto Labarrere (Labarrere, 1997) estab...

  17. Vicente Ignacio Imperial Digueri y Trejo : ingeniero militar, marino, urbanista y arquitecto del siglo XVIII

    Directory of Open Access Journals (Sweden)

    Juan Torrejón Chaves

    1989-01-01

    Full Text Available Nacido en Oran el 28 de junio de 1745, fueron sus padres Ignacio Imperial Digueri, oriundo de Cartagena y destinado, a la sazón, como oficial en el Regimiento de Infantería de esta plaza norteafricana, donde alcanzó el grado de comandante de su segundo batallón —puesto que desempeñaba cuando ocurrió su muerte, el 5 de junio de 1769—, y Paula Trejo Monroy y Salcedo, natural de Badajoz, quien falleció con posterioridad a mayo de 1781, posiblemente en la ciudad de Cartagena. Otros hijos del matrimonio fueron: Antonio, Juan Bautista —que se ordenó sacerdote del Orden de Mínimos de San Francisco de Paula—, Manuel, Luisa y Teresa.

  18. Magos e ingenieros en el Renacimiento: una reevaluación

    Directory of Open Access Journals (Sweden)

    Elena, Alberto

    1998-04-01

    Full Text Available Not available.La historiografía de la ciencia ha tendido abusivamente a identificar la Revolución Científica con las decisivas aportaciones realizadas en el siglo XVII, subestimando así la importancia de las contribuciones renacentistas. Pero la reevaluación de la tradición mecánica y artesanal que habría de conducir con posterioridad a un espectacular desarrollo tecnológico arrancó, de hecho, en el siglo XVI de la mano de la magia natural. Un atento análisis de la obra de Francis Bacon, el gran ideólogo de la ciencia moderna y el máximo valedor de la recuperación de las artes mecánicas por parte de la tradición erudita, evidencia con claridad cuán profunda y determinante fue esta deuda contraída con la pujante tradición mágica del pensamiento renacentista.

  19. Dos obras de la oficina técnica Piguet Ingenieros Cs., S.A.

    Directory of Open Access Journals (Sweden)

    Editorial, Equipo

    1974-04-01

    Full Text Available In this article are described: Two rectilinear independent bridges by means of which the Leman N. 9 highway bridges over the Paudèze valley. Both are 400 m long and 12 m wide and consist of two traffic lanes and a parking strip. Maximum height 70 m and average height 30 m. It is to be emphasized that the molassic region of Belmont presented disastrous geological conditions for which reason the foundation was subject to a most detailed and accurate investigation. In view of the above mentioned circumstances a competition of projects was announced, the winner of which is being presented here. The Lendar bridge, between Belmont and La Croix, is a correction of RC773, that bridges over RC770. In order to avoid excessive loads on a ground that showed the same characteristics as mentioned for the Paudèze bridges this was constructed in the shape of a curve so as not to get too close to the embankment which is supported by a retaining wall of reinforced concrete. The bridge has a total length of 152 m —distributed in four sections— and a width of 15.60 m. Both constructions are of reinforced concrete.En este artículo se describen: 1. Dos puentes rectilíneos independientes, mediante los cuales la autopista del Léman N 9 franquea el valle de la Paudèze. Tienen ambos unos 400 m de longitud y una anchura de 12 m, que se componen de dos vías de circulación y una banda de estacionamiento. Altura máxima de 70 m y media de 30 m. Es de destacar que las características de la región molásica del Belmont presentaba unas condiciones geológicas desastrosas, por lo que la cimentación fue motivo de un minucioso y prudente estudio. Todo lo citado anteriormente aconsejó convocar un concurso de proyectos, del que fue ganador el que aquí presentamos. 2. El puente del Lendar, entre Belmont y La Croix, es una corrección de la RC 773, que franquea la RC770. A fin de evitar cargas excesivas sobre un terreno que presentaba las mismas deficientes características que se han mencionado para los puentes de la Paudèze, se ha construido en curva, a fin de no ceñirse al terraplén, el cual ha sido sujetado mediante un muro de contención de hormigón armado. El puente tiene una longitud total de 152 m —distribuidos en cuatro tramos — y una anchura de 15,60 m. Ambas obras son de hormigón pretensado.

  20. Informática (Ingeniero Técnico en Obras Públicas)

    OpenAIRE

    Pérez Iglesias, José Luis; Lenguajes y sistemas informáticos

    2008-01-01

    Materiales de clase: 0.Introducción; 1.Tema 1: Conceptos generales; 2.Tema 2:El Procesador; 3. Tema 3: Memorias; 4. Tema 4: Periféricos; 5. Tema 5: Codificación de la Información; 6. Tema 6: Sistemas Operativos; 7. Tema 7: enguajes de Programación; 8. Tema 8: Estructuras básicas; 9. Tema 9: Redes y telecomunicaciones; 10. Tema 10: Diagnóstico molecular en Microbiología clínica; 11. Tema 11: Parasitosis titulares; 12. Tema 12: infecciones fúngicas; 13. Tema 13: Antimicrobianos; 14. Tema 14: Ep...

  1. XNAT Central: Open sourcing imaging research data.

    Science.gov (United States)

    Herrick, Rick; Horton, William; Olsen, Timothy; McKay, Michael; Archie, Kevin A; Marcus, Daniel S

    2016-01-01

    XNAT Central is a publicly accessible medical imaging data repository based on the XNAT open-source imaging informatics platform. It hosts a wide variety of research imaging data sets. The primary motivation for creating XNAT Central was to provide a central repository to host and provide access to a wide variety of neuroimaging data. In this capacity, XNAT Central hosts a number of data sets from research labs and investigative efforts from around the world, including the OASIS Brains imaging studies, the NUSDAST study of schizophrenia, and more. Over time, XNAT Central has expanded to include imaging data from many different fields of research, including oncology, orthopedics, cardiology, and animal studies, but continues to emphasize neuroimaging data. Through the use of XNAT's DICOM metadata extraction capabilities, XNAT Central provides a searchable repository of imaging data that can be referenced by groups, labs, or individuals working in many different areas of research. The future development of XNAT Central will be geared towards greater ease of use as a reference library of heterogeneous neuroimaging data and associated synthetic data. It will also become a tool for making data available supporting published research and academic articles.

  2. Betweenness Centrality in Some Classes of Graphs

    Directory of Open Access Journals (Sweden)

    Sunil Kumar Raghavan Unnithan

    2014-01-01

    Full Text Available There are several centrality measures that have been introduced and studied for real-world networks. They account for the different vertex characteristics that permit them to be ranked in order of importance in the network. Betweenness centrality is a measure of the influence of a vertex over the flow of information between every pair of vertices under the assumption that information primarily flows over the shortest paths between them. In this paper we present betweenness centrality of some important classes of graphs.

  3. Central Serous Chorioretinopathy after Solar Eclipse Viewing

    Directory of Open Access Journals (Sweden)

    Allie Lee

    2010-01-01

    Full Text Available Purpose: To report a case of central serous chorioretinopathy after solar eclipse viewing. Case Report: A middle-age man developed a sudden-onset unilateral scotoma after viewing a partial solar eclipse in Hong Kong. Fundus examination, fluorescein angiography, and optical coherence tomography showed features compatible with central serous chorioretinopathy. The patient was managed conservatively and reevaluated periodically. Serial optical coherence tomographic evaluations demonstrated an initial increase in the amount of subretinal fluid which spontaneously resolved 10 weeks after the onset of symptoms. Conclusion: This case demonstrates the possibility of development of central serous chorioretinopathy following solar eclipse viewing.

  4. [Functional anatomy of the central nervous system].

    Science.gov (United States)

    Krainik, A; Feydy, A; Colombani, J M; Hélias, A; Menu, Y

    2003-03-01

    The central nervous system (CNS) has a particular regional functional anatomy. The morphological support of cognitive functions can now be depicted using functional imaging. Lesions of the central nervous system may be responsible of specific symptoms based on their location. Current neuroimaging techniques are able to show and locate precisely macroscopic lesions. Therefore, the knowledge of functional anatomy of the central nervous system is useful to link clinical disorders to symptomatic lesions. Using radio-clinical cases, we present the functional neuro-anatomy related to common cognitive impairments.

  5. Central black hole masses of galaxies

    Institute of Scientific and Technical Information of China (English)

    樊军辉

    2003-01-01

    In this paper, the stellar velocity dispersions in the host galaxies are used to estimate the central black hole masses for a sample of elliptical galaxies. We find that the central black hole masses are in the range of 10(5.5-9.5) M(○). Based on the estimated masses in this paper and those by Woo & Urry (2002) and the measured host galaxy absolute magnitude,a relation, log(MBH/M(○)) = -(0.25 ± 4.3 × 10-3)MR + (2.98 4 0.208) is found for central black hole mass and the host galaxy magnitude. Some discussions are presented.

  6. Erroneous laboratory values obtained from central catheters.

    Science.gov (United States)

    Johnston, J B; Messina, M

    1991-01-01

    Serious analytic errors in potassium measurements have been identified in blood specimens obtained from newly inserted central catheters. Erroneous elevated readings have been related to interactions of chemistry analyzer electrodes and substances fixed to external and intraluminal walls of the central catheter. Anecdotal summaries of this phenomenon are presented to enable the nurse to recognize potential problems when sampling blood from central catheters. Studies were performed to determine the amount of flush necessary to clear the catheter of interfering residue. To eliminate this potentially hazardous occurrence, recommended flush volumes, nursing implications, and actions are described.

  7. Genetics Home Reference: central precocious puberty

    Science.gov (United States)

    ... difference in gene activation is caused by a phenomenon called genomic imprinting. Because only the copy of ... cause the disorder. When passed from parent to child, the condition is known as familial central precocious ...

  8. 1999 Yellow River Aerial Photos, Central Wisconsin

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — The 25-mile stretch of the Yellow River adjacent to the Necedah National Wildlife Refuge in Central Wisconsin provides valuable habitat to numerous species of...

  9. Red wine, arterial stiffness and central hemodynamics.

    Science.gov (United States)

    Karatzi, Kalliopi; Papaioannou, Theodore G; Papamichael, Christos; Lekakis, John; Stefanadis, Christodoulos; Zampelas, Antonis

    2009-01-01

    Red wine is considered to reduce cardiovascular risk and decrease peripheral systolic and diastolic blood pressure. Central aortic pressures are often more sensitive clinical and prognostic factors than peripheral pressures, while arterial stiffness is an independent prognostic factor for cardiovascular events. Great efforts are being made to find natural sources of improving health. In order to clarify the mechanisms under which a widely used drink, like red wine, is affecting heart and vessels, we aimed to review the available data regarding the effects of red wine on arterial stiffness, wave reflections and central blood pressures. The effect of red wine on central hemodynamics has been poorly explored with divergent results. Possible consequences of acute and long-term intake on arterial stiffness, wave reflections and central pressures are not clear. This might make someone skeptical when suggesting the consumption of a glass of red wine, although its cardioprotective actions (when moderately consumed) are already shown from epidemiological studies.

  10. NCI Central Review Board Receives Accreditation

    Science.gov (United States)

    The Association for the Accreditation of Human Research Protection Programs has awarded the NCI Central Institutional Review Board full accreditation. AAHRPP awards accreditation to organizations demonstrating the highest ethical standards in clinical res

  11. Random walk centrality in interconnected multilayer networks

    CERN Document Server

    Solé-Ribalta, Albert; Gómez, Sergio; Arenas, Alex

    2015-01-01

    Real-world complex systems exhibit multiple levels of relationships. In many cases they require to be modeled as interconnected multilayer networks, characterizing interactions of several types simultaneously. It is of crucial importance in many fields, from economics to biology and from urban planning to social sciences, to identify the most (or the less) influential nodes in a network using centrality measures. However, defining the centrality of actors in interconnected complex networks is not trivial. In this paper, we rely on the tensorial formalism recently proposed to characterize and investigate this kind of complex topologies, and extend two well known random walk centrality measures, the random walk betweenness and closeness centrality, to interconnected multilayer networks. For each of the measures we provide analytical expressions that completely agree with numerically results.

  12. Central Gulf of Alaska Rockfish Permit Program

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The North Pacific Fishery Management Council adopted the Central Gulf of Alaska Rockfish Program (Rockfish Program) on June 14, 2010, to replace the expiring Pilot...

  13. California Black Rail - Central Delta [ds17

    Data.gov (United States)

    California Department of Resources — Results of taped-call black rail surveys of in-stream habitat within certain waterways in the central Sacramento / San Joaquin Delta during 1992 and 1993. TIME...

  14. Central Asian Snow Cover from Hydrometeorological Surveys

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The Central Asian Snow Cover from Hydrometeorological Surveys data are based on observations made by personnel for three river basins: Amu Darya, Sir Darya, and...

  15. Legume Diversity Patterns in West Central Africa

    NARCIS (Netherlands)

    Estrella, de la M.; Mateo, M.A.; Wieringa, J.J.; Mackinder, B.; Munoz, J.

    2012-01-01

    Objectives - Species Distribution Models (SDMs) are used to produce predictions of potential Leguminosae diversity in West Central Africa. Those predictions are evaluated subsequently using expert opinion. The established methodology of combining all SDMs is refined to assess species diversity withi

  16. Childhood Central Nervous System Embryonal Tumors Treatment

    Science.gov (United States)

    ... Cord Tumors Treatment Childhood Astrocytomas Treatment Childhood Brain Stem Glioma ... Central nervous system (CNS) embryonal tumors may begin in embryonic (fetal) cells that remain in the brain after birth. ...

  17. NCPC Central Files Information System (CFIS)

    Data.gov (United States)

    National Capital Planning Commission — This dataset contains records from NCPC's Central Files Information System (CFIS), which is a comprehensive database of projects submitted to NCPC for design review...

  18. Central respiratory failure during acute organophosphate poisoning.

    Science.gov (United States)

    Carey, Jennifer L; Dunn, Courtney; Gaspari, Romolo J

    2013-11-01

    Organophosphate (OP) pesticide poisoning is a global health problem with over 250,000 deaths per year. OPs affect neuronal signaling through acetylcholine (Ach) neurotransmission via inhibition of acetylcholinesterase (AChE), leading to accumulation of Ach at the synaptic cleft and excessive stimulation at post-synaptic receptors. Mortality due to OP agents is attributed to respiratory dysfunction, including central apnea. Cholinergic circuits are integral to many aspects of the central control of respiration, however it is unclear which mechanisms predominate during acute OP intoxication. A more complete understanding of the cholinergic aspects of both respiratory control as well as neural modification of pulmonary function is needed to better understand OP-induced respiratory dysfunction. In this article, we review the physiologic mechanisms of acute OP exposure in the context of the known cholinergic contributions to the central control of respiration. We also discuss the potential central cholinergic contributions to the known peripheral physiologic effects of OP intoxication.

  19. Alluvial Boundary of California's Central Valley

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This digital dataset defines the extent of the alluvial deposits in the Central Valley of California and encompasses the contiguous Sacramento, San Joaquin, and...

  20. Shattering and Compressing Networks for Centrality Analysis

    CERN Document Server

    Sarıyüce, Ahmet Erdem; Kaya, Kamer; Çatalyürek, Ümit V

    2012-01-01

    Who is more important in a network? Who controls the flow between the nodes or whose contribution is significant for connections? Centrality metrics play an important role while answering these questions. The betweenness metric is useful for network analysis and implemented in various tools. Since it is one of the most computationally expensive kernels in graph mining, several techniques have been proposed for fast computation of betweenness centrality. In this work, we propose and investigate techniques which compress a network and shatter it into pieces so that the rest of the computation can be handled independently for each piece. Although we designed and tuned the shattering process for betweenness, it can be adapted for other centrality metrics in a straightforward manner. Experimental results show that the proposed techniques can be a great arsenal to reduce the centrality computation time for various types of networks.

  1. Earthquakes in Central California, 1980-1984

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — There have been many earthquake occurrences in central California. This set of slides shows earthquake damage from the following events: Livermore, 1980, Coalinga,...

  2. Veterans Affairs Central Cancer Registry (VACCR)

    Data.gov (United States)

    Department of Veterans Affairs — The Veterans Affairs Central Cancer Registry (VACCR) receives and stores information on cancer diagnosis and treatment constraints compiled and sent in by the local...

  3. Miniaturized Airborne Imaging Central Server System Project

    Data.gov (United States)

    National Aeronautics and Space Administration — The innovation is a miniaturized airborne imaging central server system (MAICSS). MAICSS is designed as a high-performance-computer-based electronic backend that...

  4. Miniaturized Airborne Imaging Central Server System Project

    Data.gov (United States)

    National Aeronautics and Space Administration — The innovation is a miniaturized airborne imaging central server system (MAICSS). MAICSS is designed as a high-performance computer-based electronic backend that...

  5. Central Bank Transparency: Causes, Consequences and Updates

    OpenAIRE

    Nergiz Dincer; Barry Eichengreen

    2009-01-01

    We present updated estimates of central bank for 100 countries up through 2006 and use them to analyze both the determinants and consequences of monetary policy transparency in an integrated econometric framework. We establish that there has been significant movement in the direction of greater central bank transparency in recent years. Transparent monetary policy arrangements are more likely in countries with strong and stable political institutions. They are more likely in democracies, with...

  6. Economic Dimensions of Security in Central Asia

    Science.gov (United States)

    2006-01-01

    dollars worth of illegal or unregistered cash, most of it associated with narcotics trafficking and unreported remittances from migrant labor , is...Economic Dimensions of Security in Central Asia month on some construction sites.32 Remittances from legal migrant labor are part of the Central Asian...farms and construction sites,36 since they rarely have any le- gal standing. Also, income from migrant labor is usually barely suffi- cient to cover

  7. "Shadow Banking: Policy Challenges for Central Banks"

    OpenAIRE

    Moe, Thorvald Grung

    2014-01-01

    Central banks responded with exceptional liquidity support during the financial crisis to prevent a systemic meltdown. They broadened their tool kit and extended liquidity support to nonbanks and key financial markets. Many want central banks to embrace this expanded role as "market maker of last resort" going forward. This would provide a liquidity backstop for systemically important markets and the shadow banking system that is deeply integrated with these markets. But how much liquidity su...

  8. Central odontogenic fibroma of the simple type

    Energy Technology Data Exchange (ETDEWEB)

    Hwang, Eui Hwan; Lee, Sang Rae [Department of Oral and Maxillofacial Radiology, College of Dentistry, Kyung Hee University, Seoul (Korea, Republic of)

    2002-12-15

    The central odontogenic fibroma is a rare benign neoplasm, and considered to be derived from the mesenchymal tissue of dental origin. It is a poorly defined tumor of the jawbones which has only been infrequently reported in the literature. We report a histologically proven case of simple-type central odontogenic fibroma, which affected the left canine-premolar region of the maxilla in a 52-year-old woman.

  9. Entrapment of guidewire during central venous catheterization

    Directory of Open Access Journals (Sweden)

    Tarun S.

    2016-07-01

    Full Text Available Central venous catheterization (CVC is common in the setting of ICU for various reasons like monitoring of CVP, fluid administration and vasopressor or drug infusions. Guidewires are routinely used in the Seldinger technique during central venous catheter placement CVC placement is not innocuous as numerous complications may occur, with varying frequency and severity. [Int J Res Med Sci 2016; 4(7.000: 3080-3081

  10. A handbook for solar central receiver design

    Energy Technology Data Exchange (ETDEWEB)

    Falcone, P.K.

    1986-12-01

    This Handbook describes central receiver technology for solar thermal power plants. It contains a description and assessment of the major components in a central receiver system configured for utility scale production of electricity using Rankine-cycle steam turbines. It also describes procedures to size and optimize a plant and discussed examples from recent system analyses. Information concerning site selection criteria, cost estimation, construction, and operation and maintenance is also included, which should enable readers to perform design analyses for specific applications.

  11. Midwifery education in Central-Eastern Europe.

    Science.gov (United States)

    Mivšek, Polona; Baškova, Martina; Wilhelmova, Radka

    2016-02-01

    Problems in midwifery in many Central-Eastern European countries are very similar; it is possible to speak about the evolving Central-Eastern model of midwifery care. The educational models of this region have a relatively strong theoretical part; however, there is an insufficient practical dimension. Theoretical part of midwifery education in the universities is relatively autonomous and is slowly changing the professional identity of graduates.

  12. Central Hemodynamics and Microcirculation in Critical Conditions

    Directory of Open Access Journals (Sweden)

    A. A. Kosovskikh

    2013-01-01

    Full Text Available Objective: to compare central hemodynamic and microcirculatory changes in critical conditions caused by different factors and to reveal their possible differences for a further differentiated approach to intensive therapy. Subjects and methods. The study covered 16 subjects with severe concomitant injury (mean age 41.96±2.83 years and 19 patients with general purulent peritonitis (mean age 45.34±2.16 years. Their follow-up was 7 days. The central hemodynamics was estimated by transpulmonary thermodilution using a Pulsion PiCCO Plus system (Pulsion Medical Systems, Germany. The microcirculatory bed was evaluated by cutaneous laser Doppler flowmetry using a LAKK-02 capillary blood flow laser analyzer (LAZMA Research-and-Production Association, Russian Federation. Results. The pattern of central hemodynamic and microcirculatory disorders varies with the trigger that has led to a critical condition. Central hemodynamics should be stabilized to ensure the average level of tissue perfusion in victims with severe concomitant injury. In general purulent peritonitis, microcirculatory disorders may persist even if the macrohemodynamic parameters are normal. Conclusion. The macrohemodynamic and microcirculatory differences obtained during the study suggest that a complex of intensive therapy should be differentiated and, if the latter is used, it is necessary not only to be based on the central hemodynamics, but also to take into consideration functional changes in microcirculation. Key words: severe concomitant injury, general purulent peritonitis, micro-circulation, central hemodynamics, type of circulation.

  13. Fast network centrality analysis using GPUs

    Directory of Open Access Journals (Sweden)

    Shi Zhiao

    2011-05-01

    Full Text Available Abstract Background With the exploding volume of data generated by continuously evolving high-throughput technologies, biological network analysis problems are growing larger in scale and craving for more computational power. General Purpose computation on Graphics Processing Units (GPGPU provides a cost-effective technology for the study of large-scale biological networks. Designing algorithms that maximize data parallelism is the key in leveraging the power of GPUs. Results We proposed an efficient data parallel formulation of the All-Pairs Shortest Path problem, which is the key component for shortest path-based centrality computation. A betweenness centrality algorithm built upon this formulation was developed and benchmarked against the most recent GPU-based algorithm. Speedup between 11 to 19% was observed in various simulated scale-free networks. We further designed three algorithms based on this core component to compute closeness centrality, eccentricity centrality and stress centrality. To make all these algorithms available to the research community, we developed a software package gpu-fan (GPU-based Fast Analysis of Networks for CUDA enabled GPUs. Speedup of 10-50× compared with CPU implementations was observed for simulated scale-free networks and real world biological networks. Conclusions gpu-fan provides a significant performance improvement for centrality computation in large-scale networks. Source code is available under the GNU Public License (GPL at http://bioinfo.vanderbilt.edu/gpu-fan/.

  14. Central auditory function of deafness genes.

    Science.gov (United States)

    Willaredt, Marc A; Ebbers, Lena; Nothwang, Hans Gerd

    2014-06-01

    The highly variable benefit of hearing devices is a serious challenge in auditory rehabilitation. Various factors contribute to this phenomenon such as the diversity in ear defects, the different extent of auditory nerve hypoplasia, the age of intervention, and cognitive abilities. Recent analyses indicate that, in addition, central auditory functions of deafness genes have to be considered in this context. Since reduced neuronal activity acts as the common denominator in deafness, it is widely assumed that peripheral deafness influences development and function of the central auditory system in a stereotypical manner. However, functional characterization of transgenic mice with mutated deafness genes demonstrated gene-specific abnormalities in the central auditory system as well. A frequent function of deafness genes in the central auditory system is supported by a genome-wide expression study that revealed significant enrichment of these genes in the transcriptome of the auditory brainstem compared to the entire brain. Here, we will summarize current knowledge of the diverse central auditory functions of deafness genes. We furthermore propose the intimately interwoven gene regulatory networks governing development of the otic placode and the hindbrain as a mechanistic explanation for the widespread expression of these genes beyond the cochlea. We conclude that better knowledge of central auditory dysfunction caused by genetic alterations in deafness genes is required. In combination with improved genetic diagnostics becoming currently available through novel sequencing technologies, this information will likely contribute to better outcome prediction of hearing devices.

  15. Dynamics-based centrality for directed networks

    Science.gov (United States)

    Masuda, Naoki; Kori, Hiroshi

    2010-11-01

    Determining the relative importance of nodes in directed networks is important in, for example, ranking websites, publications, and sports teams, and for understanding signal flows in systems biology. A prevailing centrality measure in this respect is the PageRank. In this work, we focus on another class of centrality derived from the Laplacian of the network. We extend the Laplacian-based centrality, which has mainly been applied to strongly connected networks, to the case of general directed networks such that we can quantitatively compare arbitrary nodes. Toward this end, we adopt the idea used in the PageRank to introduce global connectivity between all the pairs of nodes with a certain strength. Numerical simulations are carried out on some networks. We also offer interpretations of the Laplacian-based centrality for general directed networks in terms of various dynamical and structural properties of networks. Importantly, the Laplacian-based centrality defined as the stationary density of the continuous-time random walk with random jumps is shown to be equivalent to the absorption probability of the random walk with sinks at each node but without random jumps. Similarly, the proposed centrality represents the importance of nodes in dynamics on the original network supplied with sinks but not with random jumps.

  16. Community centrality and social science research.

    Science.gov (United States)

    Allman, Dan

    2015-12-01

    Community centrality is a growing requirement of social science. The field's research practices are increasingly expected to conform to prescribed relationships with the people studied. Expectations about community centrality influence scholarly activities. These expectations can pressure social scientists to adhere to models of community involvement that are immediate and that include community-based co-investigators, advisory boards, and liaisons. In this context, disregarding community centrality can be interpreted as failure. This paper considers evolving norms about the centrality of community in social science. It problematises community inclusion and discusses concerns about the impact of community centrality on incremental theory development, academic integrity, freedom of speech, and the value of liberal versus communitarian knowledge. Through the application of a constructivist approach, this paper argues that social science in which community is omitted or on the periphery is not failed science, because not all social science requires a community base to make a genuine and valuable contribution. The utility of community centrality is not necessarily universal across all social science pursuits. The practices of knowing within social science disciplines may be difficult to transfer to a community. These practices of knowing require degrees of specialisation and interest that not all communities may want or have.

  17. Making Central Banks Serve The Real Economy

    Directory of Open Access Journals (Sweden)

    Suleika Reiners

    2013-10-01

    Full Text Available The challenge is to redirect central bank money into the real economy and to the needs of society. If new money is issued to expand the productive capacity, there is no reason for inflation. Long-term financing could become available at an affordable price. Central bank money must not replace a sound tax system and the distribution of income and wealth, but complement them. The remaining task, apart from the financing of real needs, is the prevention of speculative asset price inflation. For this, central banks and regulators should install debt brakes for the financial sector. Furthermore, independent monetary policy calls for capital account management. It enables national central banks to find space for the conduct of their own policies in an interdependent global economy. Coordination between central banks and governments might increase as policies combine monetary, fiscal and regulatory facets. The future role of central banks should particularly lie in their insights regarding capital flows and leverage cycles and in their ability to create and withdraw money, depend­ing on economic conditions.

  18. Health challenges in Kazakhstan and Central Asia.

    Science.gov (United States)

    Adambekov, Shalkar; Kaiyrlykyzy, Aiym; Igissinov, Nurbek; Linkov, Faina

    2016-01-01

    The Central Asian region, which encompasses Kazakhstan, Uzbekistan, Tajikistan, Turkmenistan and Kyrgyzstan, is an interesting geographic region with a rich history dating back to the Silk Road, Mongol conquests and expansion of the Russian Empire. However, from a public health viewpoint, the Central Asian region is under-investigated, and many public health challenges exist, as countries of Central Asia inherited the centralised medical systems practiced in the Soviet Union, and are currently undergoing rapid transitions. A large number of low and middle-income countries around the world, including countries of Central Asia, face a double burden of chronic and infectious disease. This essay focuses on the exploration of the most important public health challenges in the Central Asian region, including limited scientific productivity, the double burden of chronic and infectious disease, the need for healthcare reform and the reduction in care variation. Central Asia has a large number of medical schools, medical centres, and emerging research institutes that can be used to foster a change in medical and public health practice in the region.

  19. Determinants of Central Adiposity among Iranian Population

    Directory of Open Access Journals (Sweden)

    Leila Azadbakht

    2013-03-01

    Full Text Available Background: Central obesity is one of the major public health problems. Recent studies have indicated that body fat distribution would be important in general health. Materials and Methods: The present study is a review of several studies which discuss the contributing factors of abdominal obesity, particulary in Iran. This study reviews 34 cross-sectional and interventional studies, which have been comducted during 1995-2012 and issued in English language. PubMed search engine and the related keywords were used to search the papers.Results: Breakfast skipping and also the sleep duration as well as the quality of diet are also associated with central adiposity. Dietary diversity score among Iranians can be related to abdominal adiposity. Fastfood consumption can increase the risk of central adiposity among young Iranian population. Red meat intake and food source of trans fat can increase the risk of central adiposity. Low quality diet with low amount of nutrients can increase the risk of central adiposity. Conclusion: Some behaviours such as sleep duration and eating breakfast can be associated with central adiposity among Iranians. Diet quality and dietary diversity score is also associated with this problem among Iranians.

  20. Market Information and Signaling in Central Bank Operations, or, How Often Should a Central Bank Intervene?

    OpenAIRE

    International Monetary Fund

    1997-01-01

    A central bank must decide on the frequency with which it will conduct open market operations and the variability in short-term money market that it will allow. The paper shows how the optimal operating procedure balances the value of attaining an immediate target and broadcasting the central bank's intentions against the informational advantages to the central bank of allowing the free play of market forces to reveal more of the information available to market participants.

  1. Central nervous system complications after liver transplantation.

    Science.gov (United States)

    Kim, Jeong-Min; Jung, Keun-Hwa; Lee, Soon-Tae; Chu, Kon; Roh, Jae-Kyu

    2015-08-01

    We investigated the diversity of central nervous system complications after liver transplantation in terms of clinical manifestations and temporal course. Liver transplantation is a lifesaving option for end stage liver disease patients but post-transplantation neurologic complications can hamper recovery. Between 1 January 2001 and 31 December 2010, patients who had undergone liver transplantation at a single tertiary university hospital were included. We reviewed their medical records and brain imaging data and classified central nervous system complications into four categories including vascular, metabolic, infectious and neoplastic. The onset of central nervous system complications was grouped into five post-transplantation intervals including acute (within 1 month), early subacute (1-3 months), late subacute (3-12 months), chronic (1-3 years), and long-term (after 3 years). During follow-up, 65 of 791 patients (8.2%) experienced central nervous system complications, with 30 occurring within 1 month after transplantation. Vascular etiology was the most common (27 patients; 41.5%), followed by metabolic (23; 35.4%), infectious (nine patients; 13.8%), and neoplastic (six patients). Metabolic encephalopathy with altered consciousness was the most common etiology during the acute period, followed by vascular disorders. An initial focal neurologic deficit was detected in vascular and neoplastic complications, whereas metabolic and infectious etiologies presented with non-focal symptoms. Our study shows that the etiology of central nervous system complications after liver transplantation changes over time, and initial symptoms can help to predict etiology.

  2. Dry needling - peripheral and central considerations.

    Science.gov (United States)

    Dommerholt, Jan

    2011-11-01

    Dry needling is a common treatment technique in orthopedic manual physical therapy. Although various dry needling approaches exist, the more common and best supported approach targets myofascial trigger points. This article aims to place trigger point dry needling within the context of pain sciences. From a pain science perspective, trigger points are constant sources of peripheral nociceptive input leading to peripheral and central sensitization. Dry needling cannot only reverse some aspects of central sensitization, it reduces local and referred pain, improves range of motion and muscle activation pattern, and alters the chemical environment of trigger points. Trigger point dry needling should be based on a thorough understanding of the scientific background of trigger points, the differences and similarities between active and latent trigger points, motor adaptation, and central sensitize application. Several outcome studies are included, as well as comments on dry needling and acupuncture.

  3. Retail Market Structure Development in Central Europe

    Directory of Open Access Journals (Sweden)

    Martin Machek

    2012-12-01

    Full Text Available This article is analyzing the trends and development in the retailing sector in Central Europe, namely in the Czech Republic, Hungary, Poland and Slovakia. These markets serve about 63 million inhabitants. The retail industry in Central Europe has changed dramatically in the last two decades, and has become a model for successful transformation of emerging markets. The retail market is highly concentrated and dominated by Western European retail chains. International retail chains are using all formats of modern distribution. This article is focusing on the development of hypermarkets, supermarkets and discount stores. Due to the international retail chains, Central European countries benefit from a dense network of modern shopping places; the intense competition of highly productive retailers contributes to the lower level of inflation rate because of the so-called Wal-Mart Effect. The constant pressure on prices influences the marketing strategies of both retailers and suppliers.

  4. Centralized rehabilitation after servere traumatic brain injury

    DEFF Research Database (Denmark)

    Engberg, Aase Worså; Liebach, Annette; Nordenbo, Annette Mosbæk

    2006-01-01

    OBJECTIVES: To present results from the first 3 years of centralized subacute rehabilitation after very severe traumatic brain injury (TBI), and to compare results of centralized versus decentralized rehabilitation. MATERIAL AND METHODS: Prospectively, the most severely injured group of adults from...... an uptake area of 2.4 million in Denmark were included at admission to a regional brain injury unit (BIU), on average 19 days after injury. Patients in the retrospective study used for comparison were randomly chosen from the national hospital register. RESULTS AND CONCLUSIONS: Out of 117 patients...... post-trauma was 0.29, and at 1 year 0.055 per 100,000 population. By comparison of 39 patients from the centralized unit injured in 2000-2003 with 21 patients injured in 1982, 1987 or 1992 and with similar PTA- and age distributions and male/female ratio, Glasgow Outcome Scale score at discharge...

  5. Angiotensin II during Experimentally Simulated Central Hypovolemia

    DEFF Research Database (Denmark)

    Jensen, Theo Walther; Olsen, Niels Vidiendal

    2016-01-01

    Central hypovolemia, defined as diminished blood volume in the heart and pulmonary vascular bed, is still an unresolved problem from a therapeutic point of view. The development of pharmaceutical agents targeted at specific angiotensin II receptors, such as the non-peptidergic AT2-receptor agonist...... of these agents in a hypovolemic setting. We argue that the latest debates on the effect of angiotensin II during hypovolemia might guide for future studies, investigating the effect of such agents during experimentally simulated central hypovolemia. The purpose of this review is to examine the role...... of angiotensin II during episodes of central hypovolemia. To examine this, we reviewed results from studies with three experimental models of simulated hypovolemia: head up tilt table test, lower body negative pressure, and hemorrhage of animals. A systemic literature search was made with the use of Pub...

  6. Central pain: definition, phisiopathology and therapy

    Directory of Open Access Journals (Sweden)

    Vincenzo Moschini

    2012-12-01

    Full Text Available Central pain is the expression of an injury and/or a primary or secondary dysfunction of the central nervous system.1 It is based on total or partial damage along the spinal-thalamic-cortical pathways and it may have cerebral or spinal origin. It has variable incidence according to its etiology: 8-10% in stroke patients, 30% in multiple sclerosis patients, 30-60% in paraplegic patients.2-3 At the spinal level, the most frequent causes are: traumatic injuries, cancer, plaques from multiple sclerosis, syringomyelia. In this review, we examine the main symptoms that contribute to confirm the diagnosis of central pain, neuropathic or thalamic. The presence of nerve injury, evaluated by neuroimaging and neurophysiological tests, allows us to complete the diagnostic picture.

  7. Generation of central exclusive final states

    CERN Document Server

    Lönnblad, Leif

    2016-01-01

    We present a scheme for the generation of central exclusive final states in the Pythia 8 program. The implementation allows for the investigation of higher order corrections to such exclusive processes as approximated by the initial-state parton shower in Pythia 8. To achieve this, the spin and colour decomposition of the initial-state shower has been worked out, in order to determine the probability that a partonic state generated from an inclusive sub-process followed by a series of initial-state parton splittings can be considered as an approximation of an exclusive colour- and spin-singlet process. We use our implementation to investigate effects of parton showers on some examples of central exclusive processes, and find sizeable effects on di-jet production, while the effects on e.g. central exclusive Higgs production are minor.

  8. Smart electromechanical systems the central nervous system

    CERN Document Server

    Kurbanov, Vugar

    2017-01-01

    This book describes approaches to solving the problems of developing the central nervous system of robots (CNSR) based on smart electromechanical systems (SEMS) modules, principles of construction of the various modules of the central nervous system and variants of mathematical software CNSR in control systems for intelligent robots. It presents the latest advances in theory and practice at the Russian Academy of Sciences. Developers of intelligent robots to solve modern problems in robotics are increasingly addressing the use of the bionic approach to create robots that mimic the complexity and adaptability of biological systems. These have smart electromechanical system (SEMS), which are used in various cyber-physical systems (CPhS), and allow the functions of calculation, control, communications, information storage, monitoring, measurement and control of parameters and environmental parameters to be integrated. The behavior of such systems is based on the information received from the central nervous syst...

  9. Centralized rehabilitation after servere traumatic brain injury

    DEFF Research Database (Denmark)

    Engberg, Aase Worså; Liebach, Annette; Nordenbo, Annette Mosbæk

    2006-01-01

    post-trauma was 0.29, and at 1 year 0.055 per 100,000 population. By comparison of 39 patients from the centralized unit injured in 2000-2003 with 21 patients injured in 1982, 1987 or 1992 and with similar PTA- and age distributions and male/female ratio, Glasgow Outcome Scale score at discharge......OBJECTIVES: To present results from the first 3 years of centralized subacute rehabilitation after very severe traumatic brain injury (TBI), and to compare results of centralized versus decentralized rehabilitation. MATERIAL AND METHODS: Prospectively, the most severely injured group of adults from...... an uptake area of 2.4 million in Denmark were included at admission to a regional brain injury unit (BIU), on average 19 days after injury. Patients in the retrospective study used for comparison were randomly chosen from the national hospital register. RESULTS AND CONCLUSIONS: Out of 117 patients...

  10. Central Venous Catheter-Related Hydrothorax

    Directory of Open Access Journals (Sweden)

    Se Hun Kim

    2015-11-01

    Full Text Available This report describes a case of 88-year-old women who developed central venous catheter-related bilateral hydrothorax, in which left pleural effusion, while right pleural effusion was being drained. The drainage prevented accumulation of fluid in the right pleural space, indicating that there was neither extravasation of infusion fluid nor connection between the two pleural cavities. The only explanation for bilateral hydrothorax in this case is lymphatic connections. Although vascular injuries by central venous catheter can cause catheter-related hydrothorax, it is most likely that the positioning of the tip of central venous catheter within the lymphatic duct opening in the right sub-clavian-jugular confluence or superior vena cava causes the catheter-related hydrothorax. Pericardial effusion can also result from retrograde lymphatic flow through the pulmonary lymphatic chains.

  11. Hydrogels for central nervous system therapeutic strategies.

    Science.gov (United States)

    Russo, Teresa; Tunesi, Marta; Giordano, Carmen; Gloria, Antonio; Ambrosio, Luigi

    2015-12-01

    The central nervous system shows a limited regenerative capacity, and injuries or diseases, such as those in the spinal, brain and retina, are a great problem since current therapies seem to be unable to achieve good results in terms of significant functional recovery. Different promising therapies have been suggested, the aim being to restore at least some of the lost functions. The current review deals with the use of hydrogels in developing advanced devices for central nervous system therapeutic strategies. Several approaches, involving cell-based therapy, delivery of bioactive molecules and nanoparticle-based drug delivery, will be first reviewed. Finally, some examples of injectable hydrogels for the delivery of bioactive molecules in central nervous system will be reported, and the key features as well as the basic principles in designing multifunctional devices will be described.

  12. Central functions of the orexinergic system

    Institute of Scientific and Technical Information of China (English)

    Xiao-Yang Zhang; Lei Yu; Qian-Xing Zhuang; Jing-Ning Zhu; Jian-Jun Wang

    2013-01-01

    The neuropeptide orexin is synthesized by neurons exclusively located in the hypothalamus.However,these neurons send axons over virtually the entire brain and spinal cord and therefore constitute a unique central orexinergic system.It is well known that central orexin plays a crucial role in the regulation of various basic non-somatic and somatic physiological functions,including feeding,energy homeostasis,the sleep/wake cycle,reward,addiction,and neuroendocrine,as well as motor control.Moreover,the absence of orexin results in narcolepsy-cataplexy,a simultaneous somatic and non-somatic dysfunction.In this review,we summarize these central functions of the orexinergic system and associated diseases,and suggest that this system may hold a key position in somatic-non-somatic integration.

  13. 75 FR 14436 - Ameren Corporation, Illinois Power Company, Central Illinois Light Company, Central Illinois...

    Science.gov (United States)

    2010-03-25

    ... Energy Regulatory Commission Ameren Corporation, Illinois Power Company, Central Illinois Light Company, Central Illinois Public Service Company, Ameren Energy Resources Company, LLC, AmerenEnergy Resources Generating Company; Notice of Filing March 18, 2010. Take notice that on March 15, 2010, Ameren...

  14. The primary Maxillary Central Incisor in the Solitary Median Maxillary Central Incisor syndrome

    DEFF Research Database (Denmark)

    Kjaer, I; Balslev-Olesen, M

    2012-01-01

    Solitary Median Maxillary Central Incisor (SMMCI) is a developmental anomaly in the permanent dentition with one single central incisor in the maxilla, positioned exactly in the midline. This condition has been associated with extra- and intraoral malformations in the frontonasal segment of the c...

  15. Actual versus perceived central bank transparency: the case of the European Central Bank

    NARCIS (Netherlands)

    van der Cruijsen, C.; Eijffinger, S.

    2008-01-01

    Central banks have become more and more transparent about their monetary policy making process. In the central bank transparency literature the distinction between actual and perceived transparency is often lacking. However, as perceptions are crucial for the actions of economic agents this distinct

  16. What Can We Learn from 15,000 Teachers in Central Europe and Central Asia?

    Science.gov (United States)

    Temple, Charles

    2000-01-01

    Describes the "Reading and Writing for Critical Thinking Project" which has now sent more than 70 volunteer teacher educators into 20 countries across Central Europe and Central Asia to help teachers to try out methods that foster active learning and critical thinking. Discusses support for the project, teaching strategies introduced,…

  17. Central Bank Independence, Centralization of Wage Bargaining, Inflation and Unemployment - Theory and Some Evidence

    NARCIS (Netherlands)

    Cukierman, A.; Lippi, F.

    1998-01-01

    This paper proposes a conceptual framework to investigate the effects of central bank independence, of the degree of centralization of wage bargaining and of the interaction between those institutional variables, on real wages, unemployment and inflation, in a framework in which unions are averse to

  18. A History of the Central Limit Theorem

    CERN Document Server

    Fischer, Hans

    2011-01-01

    This study discusses the history of the central limit theorem and related probabilistic limit theorems from about 1810 through 1950. In this context the book also describes the historical development of analytical probability theory and its tools, such as characteristic functions or moments. The central limit theorem was originally deduced by Laplace as a statement about approximations for the distributions of sums of independent random variables within the framework of classical probability, which focused upon specific problems and applications. Making this theorem an autonomous mathematical

  19. Central nervous system involvement in diabetic neuropathy.

    Science.gov (United States)

    Selvarajah, Dinesh; Wilkinson, Iain D; Davies, Jennifer; Gandhi, Rajiv; Tesfaye, Solomon

    2011-08-01

    Diabetic neuropathy is a chronic and often disabling condition that affects a significant number of individuals with diabetes. Long considered a disease of the peripheral nervous system, there is now increasing evidence of central nervous system involvement. Recent advances in neuroimaging methods detailed in this review have led to a better understanding and refinement of how diabetic neuropathy affects the central nervous system. Recognition that diabetic neuropathy is, in part, a disease that affects the whole nervous system is resulting in a critical rethinking of this disorder, opening a new direction for further research.

  20. Simulating central forces in the classroom

    CERN Document Server

    Aguirregabiria, Juan M

    2015-01-01

    We describe the easy to customize and extend open source Java program Central force workbench that can be used in the classroom to simulate the motion of a particle (or a two-body system) under central forces. It may be useful to illustrate problems in which the analytical solution is not available as well as to help students to grasp a more intuitive understanding of the main features of this kind of problem and to realize the exceptional nature of the particular case of Newtonian (and harmonic) forces. We also include some suggestions on how to use the program as a pedagogical tool.

  1. Peripheral and central mechanisms of stress resilience

    Directory of Open Access Journals (Sweden)

    Madeline L. Pfau

    2015-01-01

    Full Text Available Viable new treatments for depression and anxiety have been slow to emerge, likely owing to the complex and incompletely understood etiology of these disorders. A budding area of research with great therapeutic promise involves the study of resilience, the adaptive maintenance of normal physiology and behavior despite exposure to marked psychological stress. This phenomenon, documented in both humans and animal models, involves coordinated biological mechanisms in numerous bodily systems, both peripheral and central. In this review, we provide an overview of resilience mechanisms throughout the body, discussing current research in animal models investigating the roles of the neuroendocrine, immune, and central nervous systems in behavioral resilience to stress.

  2. Betweenness Centrality : Algorithms and Lower Bounds

    CERN Document Server

    Kintali, Shiva

    2008-01-01

    One of the most fundamental problems in large scale network analysis is to determine the importance of a particular node in a network. Betweenness centrality is the most widely used metric to measure the importance of a node in a network. In this paper, we present a randomized parallel algorithm, lower bounds and an algebraic method for computing betweenness centrality of all nodes in a network. We prove that any path comparison based algorithm cannot compute betweenness of all nodes in less than O(nm) time.

  3. Central odontogenic fibroma: a case report

    Energy Technology Data Exchange (ETDEWEB)

    Nah, Kyung Soo [School of Dentistry, Busan National University, Busan (Korea, Republic of)

    2011-06-15

    Central odontogenic fibroma is a rare odontogenic neoplasm that originates from odontogenic ectomesenchyme. Here, a case of central odontogenic fibroma in a 17-year-old male is reported. Since the present case showed a multilocular radiolucency with partially ill-defined border between the right mandibular condyle and the distal root of the right mandibular third molar, differential diagnosis involved a wide range of pathosis from benign lesions like ameoloblastic fibroma and odontogenic myxoma to more aggressive lesions such as desmoplastic fibroma, juvenile aggressive fibromatosis, or fibrosarcoma.

  4. Incoerenza temporale e indipendenza della banca centrale

    Directory of Open Access Journals (Sweden)

    Bruno Jossa

    2012-04-01

    Full Text Available According to the author, the emphasis authors currently tend to place on the 'surprise effect' in order to argue for the independence of central banks is to a large extent unjustified. The main arguments for the independence of a cen-tral bank are others: firstly, the opinion that governments are induced to in-cur excessive expenditure due to reasons highlighted by public choice theo-rists and, secondly, the idea that inflation arises in connection with social conflict. Additionally, this study makes it clear that 'time inconsistency' theory is far from being a new way of stating old ideas.  JEL Codes: E58Keywords:

  5. [Centralization in obstetrics: pros and cons].

    Science.gov (United States)

    Roemer, V M; Ramb, S

    1996-01-01

    Possible advantages and disadvantages of a general centralization of German obstetric facilities are analysed in the study. The need for centralization of risk cases, especially premature births (regionalization) is pointed out. Centralization appears appropriate, since every fifth maternity unit in Germany (19.78%) has 300 or fewer deliveries per year. This one fifth of perinatal clinics accounts for 6.3% of all deliveries (N = 49450). There are appreciable differences between the old and new federal states (Bundesländer): in the recently acceded federal states, 48.7% of all perinatal clinics have deliveries of 300 and less per year. This group of perinatal clinics accounts for 29% of all deliveries in the new federal states. We have carried out a survey of the mother's attitude to centralization: out of 416 patients in the Detmold women's hospital whose mean age was 29.0 +/- 4.2 years, 90.4% were not in favor of general centralization of obstetrics. 43% were also against a centralization of risk cases (regionalization). 75% of the women surveyed objected to centralized obstetrics because of the 'possible absence of the family', the 'possible absence of students and trainees' (44.9%), the 'unfamiliarity with staff and premises' (41.8%) and 'fear of anonymity' (44.5%). The majority of all women (84.1%) did not want to have a drive more than 20 km to an obstetrics center. Fear of 'delivery in a taxi'(78.6%), the 'fear that the husband will come too late to the delivery' (65.4%) and that the 'overall course of the delivery might not be adequate for reasons of time'. The presence of a pediatrics department in conjunction with the perinatal clinic was rated very positively (93%). It is concluded from the data and further juridical considerations that centralization of risk cases (regionalization) is indispensable in the near future and that somewhat more further into the future decentralization should be carried out by closing obstetrics departments with substantially

  6. The Boolean algebra and central Galois algebras

    Directory of Open Access Journals (Sweden)

    George Szeto

    2001-01-01

    Full Text Available Let B be a Galois algebra with Galois group G, Jg={b∈B∣bx=g(xb   for all   x∈B} for g∈G, and BJg=Beg for a central idempotent eg. Then a relation is given between the set of elements in the Boolean algebra (Ba,≤ generated by {0,eg∣g∈G} and a set of subgroups of G, and a central Galois algebra Be with a Galois subgroup of G is characterized for an e∈Ba.

  7. MRI of central nervous system anomalies

    Energy Technology Data Exchange (ETDEWEB)

    Izawa, M.; Oikawa, A.; Matoba, A.

    1987-05-01

    MRI was very useful in the evaluation of congenital anomalies of central nervous system as well as other nervous system disease with three-dimensional spatial resolution. We had experienced MRI of central nervous system anomalies, demonstrated characterisitic findings in each anomaly. MRI is useful to observe the coronal, horizontal and sagittal images of the brain and spinal cord in order to discuss the etiological mechanisms of spinal dysraphysm and its associated anomalies. In case of spina bifida cystica MRI was available to decide operative indication for radical operation and tetherd cord developed from postoperative scar or accompanied intraspinal lesions.

  8. China-Central Asia Friendship Association Founded

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    <正>The China-Central Asia Friendship Association(CCAFA) held its inaugural meeting in Beijing on December 18,2007. The CCAFA,founded at the initiation of the CPAFFC,is a national non-profit social organization with legal person status.It aims to further expand people-to-people contact between China and the five Central Asian countries,namely Kazakhstan,Kirghizstan,Tajikistan,Turkmenistan and Uzbekistan,enhance regional cooperation and deepen good-neighbourly relations so as to consolidate the social foundation for lasting friendship between China and these countries and promote common development.

  9. Ichthyofauna of the reservoirs of Central Vietnam

    Directory of Open Access Journals (Sweden)

    I. A. Stolbunov

    2012-01-01

    Full Text Available Species composition, distribution and abundance of fish in the pelagic and littoral zone of four reservoirs of Central Vietnam (Suoi Chau, Kam Lam, Da Ban and Suoi Dau were studied first. According to the research data the fish community of the reservoirs is represented by 43 species of 19 fish families.

  10. Central Asia: A New Great Game?

    Science.gov (United States)

    2007-11-02

    southward from civil war, or of revolutionary slogans hitting a chord with Iran’s own ethnic minorities, can only be met by economic investment and reliance...concern, both public and private, over the impact of radiation drifting into Kazakhstan has also been quite vocal .108 Chinese concerns about Central

  11. Quantum Central Processing Unit and Quantum Algorithm

    Institute of Scientific and Technical Information of China (English)

    王安民

    2002-01-01

    Based on a scalable and universal quantum network, quantum central processing unit, proposed in our previous paper [Chin. Phys. Left. 18 (2001)166], the whole quantum network for the known quantum algorithms,including quantum Fourier transformation, Shor's algorithm and Grover's algorithm, is obtained in a unitied way.

  12. Intracranial calcification in central diabetes insipidus.

    Science.gov (United States)

    Al-Kandari, Salwa Ramadan; Pandey, Tarun; Badawi, Mona H

    2008-01-01

    Intracranial calcification is a known but extremely rare complication of diabetes insipidus. To date, only 16 patients have been reported and all had the peripheral (nephrogenic) type of diabetes insipidus. We report a child with intracranial calcification complicating central diabetes insipidus. We also report a child with nephrogenic diabetes insipidus, and compare the patterns of intracranial calcification.

  13. Intracranial calcification in central diabetes insipidus

    Energy Technology Data Exchange (ETDEWEB)

    Al-Kandari, Salwa R. [Al Razi Hospital, Department of Clinical Radiology, Kuwait (Kuwait); Pandey, Tarun [Al Razi Hospital, Department of Clinical Radiology, Kuwait (Kuwait); University of Arkansas for Medical Sciences, Radiology Department, Little Rock, AR (United States); Badawi, Mona H. [Al-Adan Hospital, Department of Paediatrics, Kuwait (Kuwait)

    2008-01-15

    Intracranial calcification is a known but extremely rare complication of diabetes insipidus. To date, only 16 patients have been reported and all had the peripheral (nephrogenic) type of diabetes insipidus. We report a child with intracranial calcification complicating central diabetes insipidus. We also report a child with nephrogenic diabetes insipidus, and compare the patterns of intracranial calcification. (orig.)

  14. Workers' Central Life Interests and Job Performance.

    Science.gov (United States)

    Dubin, Robert; Champoux, Joseph E.

    Supervisors' ratings of individual industrial workers appear to be related to the central life interests (CLI) of the workers. The group of workers who had a job-oriented CLI received the highest ratings from their superivsors among the three CLI groups on Initiative and Application, Cooperation and Quantity of Work and were rated low on…

  15. Dust on UA1 central detector

    CERN Multimedia

    1982-01-01

    In March 1982 the central derector of UA1 was contaminated by dirt in the compressed air used for cooling during the bakeout of the beam pipe. The lengthy cleaning imposed a change of the collider schedule (Annual Report 1982 p. 114).

  16. Central serotonin metabolism and frequency of depression

    NARCIS (Netherlands)

    Praag, H.M. van; Haan, S. de

    1979-01-01

    Central serotonin (5-hydroxytryptamine; 5-HT) metabolism can be disturbed in a subgroup of patients with vital (endogenous, primary) depression. Presumably these disturbances do not result from the depression and have a predisposing rather than a causative relationship to it. This latter statement i

  17. Betweenness centrality patterns in random planar graphs

    CERN Document Server

    Lion, Benjamin

    2016-01-01

    Random planar graphs appear in a variety of context and it is important for many different applications to be able to characterize their structure. Local quantities fail to give interesting information and it seems that path-related measures are able to convey relevant information about the organization of these structures. In particular, nodes with a large betweenness centrality (BC) display non-trivial patterns, such as loops of very central nodes. We discuss briefly empirical results for different random planar graphs and we propose a toy model which allows us to discuss the condition for the emergence of non-trivial patterns such as central loops. This toy model is made of a star network with $N_b$ branches of size $n$ and links of weight $1$, superimposed to a loop at distance $\\ell$ from the center and with links of weight $w$. We estimate for this model the BC at the center and on the loop and we show that the loop can be more central than the origin if $w

  18. Gabapentin inhibits central sensitization during migraine

    Institute of Scientific and Technical Information of China (English)

    Yanbo Zhang; Guo Shao; Wei Zhang; Sijie Li; Jingzhong Niu; Dongmei Hu; Mingfeng Yang; Xunming Ji

    2013-01-01

    Peripheral and central sensitizations are phenomena that occur during migraine. The role of pentin, a migraine preventive drug, on central sensitization remains unclear. In this study, a rat model of migraine was established by electrical stimulation of the trigeminal ganglion, and the an-imals were given intragastric gabapentin. Changes in amino acid content in the cerebrospinal fluid and protein kinase C membrane translocation in the spinal trigeminal nucleus were examined to clarify the mechanisms underlying the efficacy of gabapentin in the treatment of central sensitization during migraine. Electrophysiology, liquid chromatography-mass spectrometry and western blot analysis results revealed that gabapentin reduces neuronal excitability in the spinal nucleus in the trigeminal nerve, decreases excitatory amino acid content and inhibits the activation of protein ki-nase C. This provides evidence that excitatory amino acids and protein kinase C are involved in the formation and maintenance of central sensitization during migraine. Gabapentin inhibits migraine by reducing excitatory amino acid content in the cerebrospinal fluid and inhibiting protein kinase C ac-tivation.

  19. Ferrobasalts from the Central Indian Ocean Basin

    Digital Repository Service at National Institute of Oceanography (India)

    Iyer, S.D.; Mukhopadhyay, R.; Popko, D.C.

    The occurrence of ferrobasalts recovered from the Central Indian Ocean Basin crust generated at the Southeast Indian Ridge during a phase of moderate to fast spreading accretion (approx 110-190 mm/yr, full rate) is reported. FeO (13-19%), and Ti...

  20. Universities and Knowledge Production in Central Europe

    Science.gov (United States)

    Kwiek, Marek

    2012-01-01

    The article discusses an East/West divide in Europe in university knowledge production. It argues that the communist and post-communist legacies in the four major Central European economies studied (Poland, Hungary, the Czech Republic and the Slovak Republic) matter substantially for educational and research systems. The differences in university…

  1. The central limit theorem and chaos

    Institute of Scientific and Technical Information of China (English)

    NIU Ying-xuan

    2009-01-01

    Let X be a compact metric space and f : X → X be a continuous map. This paper studies some relationships between stochastic and topological properties of dynamical systems.It is shown that if f satisfies the central limit theorem, then f is topologically ergodic and f is sensitively dependent on initial conditions if and only if f is neither minimal nor equicontinuous.

  2. Award Winning Communication Programs: Centrality or Confusion?

    Science.gov (United States)

    Beadle, Mary E.; Schmidt, Jacqueline J.

    1999-01-01

    Presents a post hoc analysis of peer-identified excellent departments at small colleges (5,000 or fewer undergraduates) to discover if they suffer from a lack of centrality. Hopes that this information may be used to help departments plan curriculum, develop evaluation methods, or write mission statements to strengthen existing programs or defend…

  3. Central Pontine and Extrapontine Myelinolysis in Encephalitis

    Directory of Open Access Journals (Sweden)

    Suvrendu Sankar Kar

    2013-08-01

    Full Text Available A 15 years male presented with fever, convulsion, unconsciousness and dystonia of acute onset. He was investigated and treated. MRI brain shows central pontine and extrapontine myelinolysis. Osmotic injury, Wilson's disease and other possibilities were excluded by clinical findings with supportive investigations. Patient was improved satisfactorily with treatment. [Natl J Med Res 2013; 3(4.000: 420-421

  4. Central African Security: Conflict in the Congo

    Science.gov (United States)

    2002-01-01

    Alliances mouvantes et conflits extraterritoriaux en Afrique Centrale. Paris: L’Hamarttan. Jean-Claude Willame, Banyarwanda et Banyamulenge: Violence...ethnique et gestion de l’identitaire au Kivu. Paris; L’Harmattan, 1997. Crawford Young, “Zaire: The Anatomy of a Failed State,” in David Birmingham & Phyllis

  5. Performance Management in Dutch Central Government

    NARCIS (Netherlands)

    Mol, Nico P.; Kruijf, de Johan A.M.

    2004-01-01

    This article investigates how and to what extent performance indicators in Dutch central government are actually embedded in performance management. In a case study encompassing 12 government organizations, the relevance of the indicators presented is analysed in three stages: (1) with respect to th

  6. Imaging of the fetal central nervous system

    NARCIS (Netherlands)

    Pistorius, L.R.

    2008-01-01

    Introduction : Ultrasound and MR imaging of the fetal central nervous system (CNS) develop at an ever-increasing rate. Theoretically, the two modalities should be synergistic, but a literature review revealed the difficulties of determining the merit of either technique and revealed gaps in our know

  7. Superficial siderosis in the central nervous system

    Energy Technology Data Exchange (ETDEWEB)

    Pythinen, J. [Oulu Univ. (Finland). Dept. of Diagnostic Radiology; Paeaekkoe, E. [Oulu Univ. (Finland). Dept. of Diagnostic Radiology; Ilkko, E. [Oulu Univ. (Finland). Dept. of Diagnostic Radiology

    1995-02-01

    We describe a rare entity, superficial siderosis of the central nervous system, due to multiple small episodes of subarachnoid haemorrhage from any source. Non-specific neurological findings are associated with deposition of iron-containing pigments in the leptomeninges and superficial layers of the cortex. T2-weighted magnetic resonance imaging demonstrates characteristic low signal in the meninges. (orig.)

  8. Ablated tektite from the central Indian Ocean

    Digital Repository Service at National Institute of Oceanography (India)

    Glass, B.P.; Chapman, D.R.; ShyamPrasad, M.

    , if it originated in Southeast Asia, it must have had a very shallow trajectory (only a few degrees) and a velocity on the order of 7 km/s as it re-entered the atmosphere. The central Indian Ocean tektite is compositionally similar to high-magnesium (HMg...

  9. The ultimate determinants of central bank independence

    NARCIS (Netherlands)

    Eijffinger, S.C.W.; Schaling, E.

    1995-01-01

    Using a graphical method, a new way of determining the optimal degree of central bank conservativeness is developed in this paper. Unlike Lohmann (1992) and Rogoff (1985), we are able to express the upper and lower bounds of the interval containing the optimal degree of conservativeness in terms of

  10. Stochastic modelling of central heating systems

    DEFF Research Database (Denmark)

    Hansen, Lars Henrik

    1997-01-01

    and the degree Erhvervsforsker (a special Danish degree, equivalent to ``Industrial Ph.D.''). The thesis is mainly concerned with experimental design and system identification for individual components in water based central heating systems. The main contribution to this field is on the nonlinear dynamic...

  11. The Marstal Central Solar Heating Plant

    DEFF Research Database (Denmark)

    Heller, Alfred; Jochen, Dahm

    1999-01-01

    The central solar heating plant in Marstal is running since 1996 and has been monitored since. The resulting data from the plant is analysed and the plant performance evaluated. A TRNSYS-model (computersimulation) id prepared and validated based on the measured data from the plant. Acceptable good...

  12. Central Computer IMS Processing System (CIMS).

    Science.gov (United States)

    Wolfe, Howard

    As part of the IMS Version 3 tryout in 1971-72, software was developed to enable data submitted by IMS users to be transmitted to the central computer, which acted on the data to create IMS reports and to update the Pupil Data Base with criterion exercise and class roster information. The program logic is described, and the subroutines and…

  13. Radiologic placement of tunneled central venous catheter

    Energy Technology Data Exchange (ETDEWEB)

    Hahn, Seong Tae; Yang, Po Song; Yang, Dong Hunn; Kim, Ki Tae; Kim, Choon Yul; Shinn, Kyung Sub [The Catholic Univ. College of Medicine, Seoul (Korea, Republic of); Yun, Eun Joo [Korea Veterans Hospital, Seoul (Korea, Republic of)

    1996-01-01

    To evaluate the efficacy and safety of fluoroscopy-guided, radiologic placement of a tunneled central venous catheter into the superior vena cava (SVC). Thirty five patients underwent tunneled central venous catheter placement to facilitate long-term chemotherapy. They included 33 leukemic patients, one colon cancer patient, and one multiple myeloma patient. After confirming central venous patency with a injection of contrast media via the peripheral cephalic or basilic vein in the wrist joint, the subclavian vein was punctured under fluoroscopic guidance. A 7F double lumen TPN catheter was placed into the SVC through a subcutaneous tunnel in the anterior chest wall. Catheter placements were successful in all patients. The mean procedure time was 17.2minutes, mean fluooscopy time was 1.3minutes, mean number of punctures was 1.4, and mean volume of injhected contrast media was 43.5cc. Only two of all leukemic patients developed mild hematomas at the puncture site, but these soon resolved themselves. None of the patients developed pneumothorax or hemothorax. But late complications included local infection in two patients (6%) and thrombotic occlusion of the catheter in one (3%). The occluded catheter was successfully recanalized with Urokinase infusion. Fluoroscopy-guided, radiologic placement of a tunneled central venous catheter is an easy and safe method, and useful for patients requiring long-term venous access.

  14. Central Limit Theorem for Coloured Hard Dimers

    Directory of Open Access Journals (Sweden)

    Maria Simonetta Bernabei

    2010-01-01

    Full Text Available We study the central limit theorem for a class of coloured graphs. This means that we investigate the limit behavior of certain random variables whose values are combinatorial parameters associated to these graphs. The techniques used at arriving this result comprise combinatorics, generating functions, and conditional expectations.

  15. The quantum human central neural system.

    Science.gov (United States)

    Alexiou, Athanasios; Rekkas, John

    2015-01-01

    In this chapter we present Excess Entropy Production for human aging system as the sum of their respective subsystems and electrophysiological status. Additionally, we support the hypothesis of human brain and central neural system quantumness and we strongly suggest the theoretical and philosophical status of human brain as one of the unknown natural Dirac magnetic monopoles placed in the center of a Riemann sphere.

  16. Gravimetric maps of the Central African Republic

    Science.gov (United States)

    Albouy, J.; Godivier, R. (Principal Investigator)

    1982-01-01

    Gravimetric maps of the Central African Republic are described including a map of Bouguer anomalies at 1/1,000,000 in two sections (eastern sheet, western sheet) and a map, in color, of Bouguer anomalies at 1/2,000,000. Instrumentation, data acquisition, calibration, and data correction procedures are discussed.

  17. Primary Angiitis Of The Central Nervous System

    Directory of Open Access Journals (Sweden)

    Sundaram Meenakshi

    2001-01-01

    Full Text Available An unusual case of primary angiitis of central nervous system (PACNS presenting with headache, seizures and focal deficits is presented. Despite multiple lesions noted on brain MRI, definitive diagnosis required a brain biopsy. A high index of clinical suspicious and the utility of brain biopsy for diagnosis are emphasized.

  18. Hypersensitivity Responses in the Central Nervous System

    DEFF Research Database (Denmark)

    Khorooshi, Reza; Asgari, Nasrin; Mørch, Marlene Thorsen

    2015-01-01

    of pathology in neuromyelitis optica (NMO), a central nervous system (CNS) demyelinating disease where activated neutrophils infiltrate, unlike in MS. The most widely used model for MS, experimental autoimmune encephalomyelitis, is an autoantigen-immunized disease that can be transferred to naive animals...

  19. Interferons in the central nervous system

    DEFF Research Database (Denmark)

    Owens, Trevor; Khorooshi, Reza M. H.; Wlodarczyk, Agnieszka

    2014-01-01

    Interferons (IFNs) are implicated as an important component of the innate immune system influencing viral infections, inflammation, and immune surveillance. We review here the complex biological activity of IFNs in the central nervous system (CNS) and associated glial–immune interactions...

  20. THE LICHENS OF NORTH CENTRAL OKLAHOMA

    Directory of Open Access Journals (Sweden)

    DARVIN WENDELL KECK

    2006-12-01

    Full Text Available Over 1,000 specimens of lichens were collected at 78 collecting stations in 11 counties of North Central Oklahoma during 1959 and 1960. The objectives were to identify lichens collected in the area; to establish a record of lichen distribution for each county in the area; and to analyze the ecological relationships.

  1. Notes on Central Asian dragonflies (Insecta: Odonata)

    NARCIS (Netherlands)

    Schoorl Jr., J.W.

    2000-01-01

    New and old material from Central Asia is published. In total 38 species are recorded from various locations in this region. For the more interesting species notes and figures are provided. One probably new Ischnura species is briefly described, but not formally named. For a, possibly new, subspecie

  2. Notes on Central Asian dragonflies (Insecta: Odonata)

    OpenAIRE

    Schoorl Jr., J.W.

    2000-01-01

    New and old material from Central Asia is published. In total 38 species are recorded from various locations in this region. For the more interesting species notes and figures are provided. One probably new Ischnura species is briefly described, but not formally named. For a, possibly new, subspecies of Sympetrum sinaiticum Dumont, 1977, a short diagnosis with figures is provided.

  3. Larger foraminifera from Central Falcon (Venezuela)

    NARCIS (Netherlands)

    Gorter, Nettie E.; Vlerk, van der I.M.

    1931-01-01

    Dr. H. G. Kugler, chief geologist of the North Venezuelan Petroleum Company, at Puerto Cabello, entrusted us with the examination of a collection of larger foraminifera, selected from material collected by the geologists of this Company in Central Falcon. Dr. A. Senn kindly added material that had a

  4. Volkswagen Sets up Central Lab in BRICI

    Institute of Scientific and Technical Information of China (English)

    2005-01-01

    @@ On June 2, Volkswagen Corp of Germany settled its Chinese central laboratory in Sinopec Beijing Research Institute of Chemical Industry (BRICI). This is the top-level lab of Volkswagen in Asia - Pacific region and it marks another close cooperation between Volkswagen Corp of Germany and Sinopec Corp.

  5. The Centrality of Engagement in Higher Education

    Science.gov (United States)

    Fitzgerald, Hiram E.; Bruns, Karen; Sonka, Steven T.; Furco, Andrew; Swanson, Louis

    2016-01-01

    The centrality of engagement is critical to the success of higher education in the future. Engagement is essential to most effectively achieving the overall purpose of the university, which is focused on the knowledge enterprise. Today's engagement is scholarly, is an aspect of learning and discovery, and enhances society and higher education.…

  6. Financial Stability and Central Bank Governance

    NARCIS (Netherlands)

    Koetter, Michael; Roszbach, Kasper; Spagnolo, Giancarlo

    2014-01-01

    The financial crisis has ignited a debate about the appropriate objectives and the governance structure of Central Banks. We use novel survey data to investigate the relation between these traits and banking system stability focusing in particular on their role in micro-prudential supervision. We fi

  7. Stone age transitions. Neolithisation in central Scandinavia

    Directory of Open Access Journals (Sweden)

    Helena Knutsson

    2003-01-01

    Full Text Available A summary of a series of individual research projects focused on the processes from the Mesolithic to the Late Neolithic in central Scandinavia. The projects were embeded in the "Coast to Coast project". The historicity in this process was emphasised.

  8. Fat graft myringoplasty in small central perforations

    Directory of Open Access Journals (Sweden)

    Chandni Sharma

    2014-01-01

    Full Text Available Background: Perforations of the tympanic membrane (TM are treated with various surgical techniques and materials. Although autologous temporalis fascia is the most common material used for the closure of TM perforations, however for a dry, small central perforation the fat graft myringoplasty (FM is a good alternative as it is a simple and cost-effective technique. Objectives: The aim of this study was to determine the efficacy of FM for repair of small central perforations. Suggestions for optimizing the outcome of FM are presented. Material and Methods: Twenty patients (10 males and 10 females who had uncomplicated dry small central perforation, which was confined to one quadrant of the pars tensa underwent FM. The outcome was evaluated after 1-week, 1-month, and 3 months. Results: After 3 months of follow-up, a closure rate of 80% was achieved. Mean preoperative air-bone (AB gap was 22.90 ± 6.54 dB and mean postoperative AB gap was 21.80 ± 6.28 dB. Mean improvement in AB gap postoperatively was 1.1 ± 2.63 dB. Conclusion: Fat graft myringoplasty, with its ease of technique and good graft uptake rate justifies its use in the closure of small dry central TM perforations.

  9. Clinical analysis and treatment of central pain due to headinjury

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    @@Central pain is induced by the involvement of the abnormal pain pathway due to diseases of the central nervous system. Central pain after brain trauma is common clinically, but it is often misdiagnosed and neglected because of lack of objective disturbances. We treated 20 cases of central pain after head injury by invigorating blood circulation and satisfactory result was obtained.

  10. A measure of centrality based on modularity matrix

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    In this paper, a kind of measure of structural centrality for networks, called modularity centrality, is introduced. This centrality index is based on the eigenvector belonging to the largest magnitude eigenvalue of modularity matrix. The measure is illustrated and compared with the standard centrality measures using a classic dataset. The statistical distribution of modularity centrality is investigated by con- sidering large computer generated graphs and two networks from the real world.

  11. A Climatology of Central American Gyres

    Science.gov (United States)

    Papin, P. P.; Griffin, K. S.; Bosart, L. F.; Torn, R. D.

    2012-12-01

    Monsoon gyres, commonly found over the western Pacific Ocean, are characterized by broad low-level cyclonic circulations that occur at a variety of spatial scales ranging from 1500-3000 km. Low-level cyclonic gyre circulations, while less frequent and occupying a smaller scale, have also been observed over Central America during the tropical cyclone (TC) season. A noteworthy gyre observed during the 2010 PREDICT field project served as a "collector" of TC Matthew and a source for TC Nicole. During October 2011, devastating flooding occurred in Guatemala and El Salvador when TD 12-E, embedded in a gyre circulation, made landfall on the Pacific coast of Central America. These gyre occurrences, their apparent links to TC activity, and their association with high-impact weather motivates this presentation. A preliminary analysis of Central American gyres suggests that their spatial scales vary between 1000-2000 km. These gyres also tend to be co-located with reservoirs of deep moisture that are characterized by high precipitable water values (>50 mm) and embedded deep convection on their southern and eastern sides. Catastrophic flooding can occur when gyre cyclonic circulations interact with the topography of Central America. A Central American gyre climatology including gyre frequency over the TC season and individual gyre duration will be presented. This climatology is then used to craft a gyre composite using previous gyre cases from 1980-2010. Particular attention will be given to the common synoptic and sub-synoptic scale features that precede and take place during gyre formation. This includes the role that intraseasonal and interannual circulations such as the Madden-Julian Oscillation (MJO) and El Nino-Southern Oscillation (ENSO) might play in gyre development. TC genesis events within gyre circulations will also be highlighted and examined further. Finally, the results of a September 2010 case study will be used to illustrate the impact that Central American

  12. THE ALLIANCE TRACHYNION DISTACHYAE RIVAS-MARTINEZ 1978 IN CENTRAL ITALYIN CENTRAL ITALY

    Directory of Open Access Journals (Sweden)

    M. DE SANCTIS

    2010-01-01

    Full Text Available The therophytic basiphilous vegetation of Central Italy has been generally framed in a single association Trifolio scabri- Hypochoeridetum achyrophori Biondi et al. 1997. We show that a considerable floristic variation exists inside Trifolio-Hypochoeridetum in Central Italy, and that it should be treated as a complex of no less than five different associations: Medicagini rigidulae-Trifolietum scabri Fanelli et al. hoc loco, Trifolio scabri-Hypochoeridetum achyrophori Biondi, Izco. Ballelli & Formica 1997 s.s, Hippocrepido siliquosae- Brachypodietum distachyi Fanelli et al. ad interim, Trigonello gladiatae-Brachypodietum distachyi Fanelli et al. hoc loc, Crucianello latifoliae-Hypochoeridetum achyrophori Filesi, Blasi, Di Marzio 1996. These associations are floristically and ecologically distinct, and show different geographical ranges in Central Italy. The great diversity of Trachynion distachyae in Central Italy is related to the widespread occurrence of limestone and calcareous alluvial rocks and to a climate with abundant winter and autumn rains very favourable to the development of winter annuals.

  13. On Central Extensions of Associative Dialgebras

    Science.gov (United States)

    Rakhimov, Isamiddin S.

    2016-03-01

    The concept of central extensions plays an important in constructing extensions of algebras. This technique has been successfully used in the classification problem of certain classes of algebras. In 1978 Skjelbred and Sund reduced the classification of nilpotent Lie algebras in a given dimension to the study of orbits under the action of automorphism group on the space of second degree cohomology of a smaller Lie algebra with coefficients in a trivial module. Then W. de Graaf applied the Skjelbred and Sund method to the classification problem of low-dimensional nilpotent Lie and associative algebras over some fields. The main purpose of this note is to establish elementary properties of central extensions of associative dialgebras and apply the above mentioned method to the classification of low dimensional nilpotent associative dialgebras.

  14. [Central nervous system malformations: neurosurgery correlates].

    Science.gov (United States)

    Jiménez-León, Juan C; Betancourt-Fursow, Yaline M; Jiménez-Betancourt, Cristina S

    2013-09-06

    Congenital malformations of the central nervous system are related to alterations in neural tube formation, including most of the neurosurgical management entities, dysraphism and craniosynostosis; alterations of neuronal proliferation; megalencefaly and microcephaly; abnormal neuronal migration, lissencephaly, pachygyria, schizencephaly, agenesis of the corpus callosum, heterotopia and cortical dysplasia, spinal malformations and spinal dysraphism. We expose the classification of different central nervous system malformations that can be corrected by surgery in the shortest possible time and involving genesis mechanisms of these injuries getting better studied from neurogenic and neuroembryological fields, this involves connecting innovative knowledge areas where alteration mechanisms in dorsal induction (neural tube) and ventral induction (telencephalization) with the current way of correction, as well as the anomalies of cell proliferation and differentiation of neuronal migration and finally the complex malformations affecting the posterior fossa and current possibilities of correcting them.

  15. Sheehan's syndrome with central diabetes insipidus.

    Science.gov (United States)

    Laway, Bashir Ahmad; Mir, Shahnaz Ahmad; Dar, Mohd Iqbal; Zargar, Abdul Hamid

    2011-03-01

    Sheehan's syndrome refers to the occurrence of hypopituitarism after delivery, usually preceded by postpartum hemorrhage. The condition still continues to be a common cause of hypopituitarism in developing countries like India. The disorder usually presents with anterior pituitary failure with preservation of posterior pituitary functions. Posterior pituitary dysfunction in the form of central diabetes insipidus is rare in patients with Sheehan's syndrome. We describe the clinical course of a young lady who after her sixth childbirth developed severe postpartum hemorrhage followed by development of panhypopituitarism which was confirmed by hormonal investigation and demonstration of empty sella on imaging. In addition, she developed Polyuria. The water deprivation test and response to vasopressin test results indicated central diabetes insipidus. She needed oral desmopressin on a continuous basis to control polyuria.

  16. Comprehensive management of presbycusis: central and peripheral.

    Science.gov (United States)

    Parham, Kourosh; Lin, Frank R; Coelho, Daniel H; Sataloff, Robert T; Gates, George A

    2013-04-01

    The prevailing otolaryngologic approach to treatment of age-related hearing loss (ARHL), presbycusis, emphasizes compensation of peripheral functional deficits (ie, hearing aids and cochlear implants). This approach does not address adequately the needs of the geriatric population, 1 in 5 of whom is expected to consist of the "old old" in the coming decades. Aging affects both the peripheral and central auditory systems, and disorders of executive function become more prevalent with advancing age. Growing evidence supports an association between age-related hearing loss and cognitive decline. Thus, to facilitate optimal functional capacity in our geriatric patients, a more comprehensive management strategy of ARHL is needed. Diagnostic evaluation should go beyond standard audiometric testing and include measures of central auditory function, including dichotic tasks and speech-in-noise testing. Treatment should include not only appropriate means of peripheral compensation but also auditory rehabilitative training and counseling.

  17. Centralized, Decentralized, and Hybrid Purchasing Organizations

    DEFF Research Database (Denmark)

    Bals, Lydia; Turkulainen, Virpi

    This paper addresses one of the focal issues in purchasing and supply management – global sourcing – from an organizational design perspective. In particular, we elaborate the traditional classification of global sourcing organization designs into centralized, decentralized, and hybrid models. We...... organization we can identify organization designs beyond the classical centralization-decentralization continuum. We also provide explanations for the observed organization design at GCC. The study contributes to research on purchasing and supply management as well as research on organization design....... illustrate with our empirical analysis on global sourcing organization design at Global Chemical Company (GCC, a pseudonym) that revisiting the conventional wisdom about global sourcing organization designs is required; by engaging in a detailed, subfirm level of analysis on the design of the purchasing...

  18. Association and Centrality in Criminal Networks

    DEFF Research Database (Denmark)

    Petersen, Rasmus Rosenqvist

    Network-based techniques are widely used in criminal investigations because patterns of association are actionable and understandable. Existing network models with nodes as first class entities and their related measures (e.g., social networks and centrality measures) are unable to capture...... and analyze the structural richness required to model and investigate criminal network entities and their associations. We demonstrate a need to rethink entity associations with one specific case (inspired by \\textit{The Wire}, a tv series about organized crime in Baltimore, United States) and corroborated...... by similar evidence from other cases. Our goal is to develop centrality measures for fragmented and non-navigational states of criminal network investigations. A network model with three basic first class entities is presented together with a topology of associations between network entities. We implement...

  19. Centralizers in simple locally finite groups

    Directory of Open Access Journals (Sweden)

    Mahmut Kuzucuoğlu

    2013-03-01

    Full Text Available This is a survey article on centralizers of finitesubgroups in locally finite, simple groups or LFS-groups as wewill call them. We mention some of the open problems aboutcentralizers of subgroups in LFS-groups and applications of theknown information about the centralizers of subgroups to thestructure of the locally finite group. We also prove thefollowing: Let $G$ be a countably infinite non-linear LFS-groupwith a Kegel sequence $mathcal{K}={(G_i,N_i | iinmathbf{N} }$. If there exists an upper bound for ${ |N_i| |iin mathbf{N} }$, then for any finite semisimplesubgroup $F$ in $G$ the subgroup $C_G(F$ has elements oforder $p_i$ for infinitely many distinct prime $p_i$. Inparticular $C_G(F$ is an infinite group. This answers Hartley'squestion provided that there exists a bound on ${ |N_i| | iin mathbf{N}$.

  20. Introduction to FAST central control system

    Science.gov (United States)

    Sun, Jinghai; Zhu, Lichun; Jiang, Zhiqian

    2016-07-01

    FAST is the largest single dish radio telescope in the world. During observation, part of spherical reflector forms paraboloid to the source direction, meanwhile the feed is placed to instant focus. The control of telescope is difficult and complicated. An autonomous central control system is designed and implemented for methodically and efficiently operation. The system connects and coordinates all subsystems including control, measurement and health monitoring for reflector, feed support and receiver respectively. The main functions are managing observation tasks, commanding subsystems, storing operating data, monitoring statuses and providing the uniform time standard. In this paper, the functions, software and hardware of FAST central control system are presented. The relative infrastructures such as power, network and control room arrangement are introduced.

  1. The segetal flora of the Central Poland

    Directory of Open Access Journals (Sweden)

    Aurelia U. Warcholińska

    2013-12-01

    Full Text Available In the paper a state and general characteristic of segetal flora of Central Poland is given. The segetal flora of the researched area consists 587 taxa. 127 (21,6% of them are on the list of threatened segetal plants. The studied flora was characterized by a high percentage of short-living plants (341 species - 58,1 %. Species of nature origin (apophytes constitute the dominant group (341 species - 58,1 %. Species of the archaeophytes group were frequently recorded (143 species - 24,4%. The most threatened species in the area of Central Poland are: Vaccaria hispanica (CR, Adonis flammea (CR, Coringia orientalis (CR, Thymelaea passerina (CR, Lythrum hyssopifolia (CR, Bupleurum rotundifolium (CR, Kickxia elatine (CR, Isolepis setacea (CR, Bromus arvensis (CR, Lolium temulentum (CR, L. remotum (CR.

  2. COOPERATION VS. COMPETITION IN CENTRAL ASIA

    Directory of Open Access Journals (Sweden)

    Veronica MIHALACHE

    2015-07-01

    Full Text Available The present study highlights the cooperation-competition ratio in the Central Asia region aiming at maintaining a force balance between Russia and China – as main state actors of the Shanghai Cooperation Organization (SCO, and avoiding the dominance of a state over the other member states of the Organization. Our paper attempts to identify the theoretical arguments that might render a better insight in this organization as a framework meant to mutually balance influence between Russia and China, with the purpose of reciprocally monitoring and limiting their power in a region considered the core of SCO – from a geographical point of view and from the point of view of the two powers’ interest. On the other hand, we should take into account that promoting multipolarity in the global politics is a common interest of China and Russia; both countries started to exclude, to various extents, the Western powers’ interests in Central Asia.

  3. Spherical explosion with central energy source

    CERN Document Server

    Masuyama, Miyu; Tsuboki, Yoichiro

    2015-01-01

    We present a novel semi-analytic solution describing the propagation of a spherical blast wave driven by a central energy source. The initial density profile has a power-law function of the distance from the center and the energy is injected only into the central region at a rate given by a power-law function of time. This solution is composed of three regions separated by the contact surface and the shock front. The innermost region is assumed to be uniform and the outside of the contact surface includes the shocked matter described by self-similar solutions. We analytically derive the applicable range of parameters of this solution from requirements to satisfy boundary conditions. We perform numerical simulations for flows with various values of parameters, some of which reside out of the thus derived applicable range, and compare with the semi-analytic solutions.

  4. Hitherto unreported Agaricus species of Central India

    Directory of Open Access Journals (Sweden)

    MAHENDRA KUMAR RAI

    2010-11-01

    Full Text Available Karwa A, Rai MK. 2010. Hitherto unreported Agaricus species of Central India. Nusantara Bioscience 2: 141-145. Melghat forest region from Central India was surveyed for occurrence of medicinal and culinary mushrooms during the years 2005-2008. Out of total 153 species, ten species of Agaricus were recorded from different localities. Of these, seven species namely Agaricus bitorquis, A. subrufescens, A. augustus, A. placomyces, A. essettei, A. basioanolosus and Agaricus sp. nov (a new species are being reported for the first time from the region. The commercial button mushroom Agaricus bisporus lacks good breeding characters due to its bisporic nature. These wild cousins of the button mushroom can definitely prove to be a good source of genetic manipulations to the existing strains and also to develop new strains with improved characters.

  5. Central charge for the Schwarzschild black hole

    Science.gov (United States)

    Ropotenko, K.

    2016-12-01

    Proceeding in exactly the same way as in the derivation of the temperature of a dual CFT for the extremal black hole in the Kerr/CFT correspondence, it is found that the temperature of a chiral, dual CFT for the Schwarzschild black hole is T = 1/2π. Comparing Cardy’s formula with the Bekenstein-Hawking entropy and using T, it is found that the central charge for the Schwarzschild black hole is of the form c = 12Jin, where Jin is the intrinsic angular momentum of the black hole, Jin = A/8πG. It is shown that the central charge for any four-dimensional (4D) extremal black hole is of the same form. The possible universality of this form is briefly discussed.

  6. Expansion of museums in Central Europe?

    Directory of Open Access Journals (Sweden)

    Jagodzińska, Katarzyna

    2015-06-01

    Full Text Available The paper presents reflections on the specificity of collections and museums of contemporary art in Central Europe and considers a possibility of creating a regional alternative for the West. The analysis is conducted in the context of the expansionist policy of contemporary museums – notably the Louvre, the Guggenheim Foundation, and the Hermitage – whose numerous new development projects gave rise to a number of dilemmas in the museological world. The author discusses global "museum brands" that invest in Central Europe and addresses the possible profits of the expansion of such "concerns" for culture in the region, as well as emphasises the potential of the region itself, which may be used for its development without the avail of the internationally renowned collectors' names.

  7. A Review of Select Centralized Pain Syndromes

    Directory of Open Access Journals (Sweden)

    David R. Spiegel

    2015-01-01

    Full Text Available Pain can be broadly divided into 3 classes, including nociceptive or inflammatory pain (protective, neuropathic (pathological, occurring after damage to the nervous system, or centralized (pathological, due to abnormal function but with no damage or inflammation to the nervous system. The latter has been posited to occur when descending analgesic pathways are attenuated and/or glutamatergic transmission is facilitated. Additionally, this “pain prone phenotype” can be associated with early life trauma and a suboptimal response to opiates. This article will review the relationships between centralized pain syndromes (ie, fibromyalgia, chronic low back pain, childhood sexual abuse, and opiate misuse. Finally, treatment implications, potentially effecting primary care physicians, will be discussed.

  8. Infections associated with the central venous catheters.

    Science.gov (United States)

    Drasković, Biljana; Fabri, Izabella; Benka, Anna Uram; Rakić, Goran

    2014-01-01

    Central venous catheters are of an essential importance to critically ill patients who require long-term venous access for various purposes. Their use made the treatment much easier, but still they are not harmless and are prone to numerous complications. Catheter infections represent the most significant complication in their use. The frequency of infections varies in different patient care settings, but their appearance mostly depends on the patient's health condition, catheter insertion time, localization of the catheter and type of the used catheter. Since they are one of the leading causes of nosocomial infections and related to significant number of morbidity and mortality in intensive care units, it is very important that maximal aseptic precautions are taken during the insertion and the maintenance period. Prevention of infection of the central venous catheters demands several measures that should be applied routinely.

  9. Primary Angiitis of the Central Nervous System

    Directory of Open Access Journals (Sweden)

    Mojdeh Ghabaee

    2012-03-01

    Full Text Available Primary angiitis of the central nervous system (PACNS is an idiopathic disorder (vasculitis restricted to the central nervous system (CNS. It often presents with focal neurological deficits suggesting stroke or a combination of confusion and headache. We herein report three cases with various combinations of fever, partial seizure, encephalopathy, paresis, headache and ataxia. One of them was initially treated as herpes simplex meningoencephalitis, but further investigations revealed primary angiitis. Primary angiitis of the CNS has protean manifestations and should always be considered in patients suspicious to have CNS infection or stroke, particularly who does not respond to the routine treatments. Clinical data, exclusion of differential diagnoses and typical angiography seem to be enough to justify the diagnosis in the majority of cases.

  10. Iowa Central Quality Fuel Testing Laboratory

    Energy Technology Data Exchange (ETDEWEB)

    Heach, Don; Bidieman, Julaine

    2013-09-30

    The objective of this project is to finalize the creation of an independent quality fuel testing laboratory on the campus of Iowa Central Community College in Fort Dodge, Iowa that shall provide the exploding biofuels industry a timely and cost-effective centrally located laboratory to complete all state and federal fuel and related tests that are required. The recipient shall work with various state regulatory agencies, biofuel companies and state and national industry associations to ensure that training and testing needs of their members and American consumers are met. The recipient shall work with the Iowa Department of Ag and Land Stewardship on the development of an Iowa Biofuel Quality Standard along with the Development of a standard that can be used throughout industry.

  11. Laparoscopic assisted central pancreatectomy with pancreaticogastrostomy reconstruction - An alternative surgical technique for central pancreatic mass resection

    Directory of Open Access Journals (Sweden)

    Iswanto Sucandy

    2010-09-01

    Full Text Available Context: Central pancreatectomy has gained popularity in the past decade as treatment of choice for low malignant potential tumor in the midpancreas due to its ability to achieve optimal preservation of pancreatic parenchyma. Simultaneously, advancement in minimally invasive approach has contributed to numerous novel surgical techniques with significantly lower morbidity and mortality. With the purpose of improving patient outcomes, we describe a laparoscopic assisted central pancreatectomy with pancreaticogastrostomy as an alternative method to the previously described open central pancreatectomy with roux-en-y pancreaticojejunostomy reconstruction. Case Report: A 39 year old man presented to our clinic with a 2.5 cm neuroendocrine tumor at the neck of the pancreas. Laparoscopic assisted central pancreatectomy with pancreaticogastrostomy reconstruction was successfully performed. Operative time was 210 minutes with blood loss of 200 ml. Postoperative course was uneventful except for a minimal pancreatic leak which was controlled by an intraoperatively placed closed suction drain. At 2 week follow up, patient was asymptomatic with well preserved pancreatic endo and exocrine functions. Permanent pathology findings showed a well differentiated neuroendocrine tumor with negative margins and nodes. Conclusions: Laparoscopic assisted central pancreatectomy with pancreaticogastrostomy reconstruction is feasible and safe for a centrally located tumor. Laparoscopic assisted technique facilitates application of minimally invasive approach by increasing surgical feasibility in typically complex pancreatic operations.

  12. Laparoscopic assisted central pancreatectomy with pancreaticogastrostomy reconstruction - An alternative surgical technique for central pancreatic mass resection

    Directory of Open Access Journals (Sweden)

    Iswanto Sucandy

    2010-01-01

    Full Text Available Context: Central pancreatectomy has gained popularity in the past decade as treatment of choice for low malignant potential tumor in the midpancreas due to its ability to achieve optimal preservation of pancreatic parenchyma. Simultaneously, advancement in minimally invasive approach has contributed to numerous novel surgical techniques with significantly lower morbidity and mortality. With the purpose of improving patient outcomes, we describe a laparoscopic assisted central pancreatectomy with pancreaticogastrostomy as an alternative method to the previously described open central pancreatectomy with roux-en-y pancreaticojejunostomy reconstruction. Case Report: A 39 year old man presented to our clinic with a 2.5 cm neuroendocrine tumor at the neck of the pancreas. Laparoscopic assisted central pancreatectomy with pancreaticogastrostomy reconstruction was successfully performed. Operative time was 210 minutes with blood loss of 200 ml. Postoperative course was uneventful except for a minimal pancreatic leak which was controlled by an intraoperatively placed closed suction drain. At 2 week follow up, patient was asymptomatic with well preserved pancreatic endo and exocrine functions. Permanent pathology findings showed a well differentiated neuroendocrine tumor with negative margins and nodes. Conclusions: Laparoscopic assisted central pancreatectomy with pancreaticogastrostomy reconstruction is feasible and safe for a centrally located tumor. Laparoscopic assisted technique facilitates application of minimally invasive approach by increasing surgical feasibility in typically complex pancreatic operations.

  13. Dry needling — peripheral and central considerations

    OpenAIRE

    Dommerholt, Jan

    2011-01-01

    Dry needling is a common treatment technique in orthopedic manual physical therapy. Although various dry needling approaches exist, the more common and best supported approach targets myofascial trigger points. This article aims to place trigger point dry needling within the context of pain sciences. From a pain science perspective, trigger points are constant sources of peripheral nociceptive input leading to peripheral and central sensitization. Dry needling cannot only reverse some aspects...

  14. Lagrange, central norms, and quadratic Diophantine equations

    Directory of Open Access Journals (Sweden)

    R. A. Mollin

    2005-01-01

    Full Text Available We consider the Diophantine equation of the form x2−Dy2=c, where c=±1,±2, and provide a generalization of results of Lagrange with elementary proofs using only basic properties of simple continued fractions. As a consequence, we achieve a completely general, simple, and elegant criterion for the central norm to be 2 in the simple continued fraction expansion of D.

  15. Cancer-related fatigue: central or peripheral?

    Science.gov (United States)

    Yavuzsen, Tugba; Davis, Mellar P; Ranganathan, Vinoth K; Walsh, Declan; Siemionow, Vlodek; Kirkova, Jordanka; Khoshknabi, Dilara; Lagman, Ruth; LeGrand, Susan; Yue, Guang H

    2009-10-01

    To evaluate cancer-related fatigue (CRF) by objective measurements to determine if CRF is a more centrally or peripherally mediated disorder, cancer patients and matched noncancer controls completed a Brief Fatigue Inventory (BFI) and underwent neuromuscular testing. Cancer patients had fatigue measured by the BFI, were off chemotherapy and radiation (for more than four weeks), had a hemoglobin level higher than 10 g/dL, and were neither receiving antidepressants nor were depressed on a screening question. The controls were screened for depression and matched by age, gender, and body mass index. Neuromuscular testing involved a sustained submaximal elbow flexion contraction (SC) at 30% maximal level (30% maximum elbow flexion force). Endurance time (ET) was measured from the beginning of the SC to the time when participants could not maintain the SC. Evoked twitch force (TF), a measure of muscle fatigue, and compound action potential (M-wave), an assessment of neuromuscular-junction transmission were performed during the SC. Compared with controls, the CRF group had a higher BFI score (Pcontrols, P<0.05). This indicated less muscle fatigue. There was a greater TF (P<0.05) at the end of the SC, indicating greater central fatigue, in the CRF group, which failed to recruit muscle (to continue the SC), as well as the controls. M-Wave amplitude was lower in the CRF group than in the controls (P<0.01), indicating impaired neuromuscular junction conduction with CRF unrelated to central fatigue (M-wave amplitude did not change with SC). These data demonstrate that CRF patients exhibited greater central fatigue, indicated by shorter ET and less voluntary muscle recruitment during an SC relative to controls.

  16. Central bank conservatism and labor market reform

    OpenAIRE

    Jordahl, Henrik; Laséen, Stefan

    1999-01-01

    How does central bank conservatism affect labor market reform? In this paper we examine the economic forces at work. An increase in conservatism triggers two opposite effects. It reduces the inflation bias of discretionary monetary policy and hence the benefits of a reform. It also increases unemployment variability, which increases the precautionary benefits of a reform. In combination, the two effects produce a u-shaped relation between conservatism and labor market reform. An empirical inv...

  17. Sensitivity Analysis of Centralized Dynamic Cell Selection

    DEFF Research Database (Denmark)

    Lopez, Victor Fernandez; Alvarez, Beatriz Soret; Pedersen, Klaus I.;

    2016-01-01

    mechanism and solutions involving cell switching in general. Simulation results show that such solutions can greatly benefit from the use of receivers with interference suppression capabilities and a larger number of antennas, with a maximum data rate gain of 120%. High performance gains are observed...... with two different traffic models, and it is not necessary to be able to connect to a large number of cells in order to reap most of the benefits of the centralized dynamic cell selection....

  18. Virasoro central charges for Nichols algebras

    CERN Document Server

    Semikhatov, A M

    2011-01-01

    Virasoro central charge associated with Nichols algebras is invariant under the Weyl groupoid action and takes very suggestive values for some items in Heckenberger's list of rank-2 Nichols algebras. In particular, this might be taken as an indication of the existence of reasonable logarithmic extensions of W3==WA2, WB2, and WG2 models of conformal field theory. In the W3 case, the construction of an octuplet extended algebra is outlined.

  19. Central compact objects in magnetic lethargy

    CERN Document Server

    Viganò, Daniele; Perna, Rosalba

    2013-01-01

    Central Compact Objects are peculiar young neutron stars, with very low external magnetic fields combined with high fluxes in the X-ray band and surface temperature anisotropies. However, in their crust the magnetic field can be strong, result of its burial during a short post-supernova hypercritical accretion episode. The implications of this latter scenario for the temperature anisotropy, pulsed fraction and luminosity are discussed.

  20. Pandillas and Security in Central America

    OpenAIRE

    2014-01-01

    This article introduces the topic of pandillas (street gangs) and their implications for security in Central America. There is minimal scholarly literature on pandillas and security. In part this is due to serious challenges in analyzing pandillas. First, pandilla members consider truth to be situational; data derived directly from them is suspect. Second, those who know most about them are involved in NGOs that rely on foreign assistance for their work. The project reports the...

  1. A Central Limit Theorem for Repeating Patterns

    CERN Document Server

    Abrams, Aaron; Landau, Henry; Landau, Zeph; Pommersheim, James

    2012-01-01

    This note gives a central limit theorem for the length of the longest subsequence of a random permutation which follows some repeating pattern. This includes the case of any fixed pattern of ups and downs which has at least one of each, such as the alternating case considered by Stanley in [2] and Widom in [3]. In every case considered the convergence in the limit of long permutations is to normal with mean and variance linear in the length of the permutations.

  2. Central bank operating frameworks and collateral markets

    OpenAIRE

    Bank for International Settlements

    2015-01-01

    Collateral markets have become increasingly important as demand for collateral assets has increased in recent years, driven by changing market practices and an evolving regulatory landscape. This report explores whether and how the design of central banks' operational frameworks influences private collateral markets, including collateral availability, pricing, related market practices, and market performance under stress. It studies these issues by reviewing available information from a range...

  3. Deforestation in eastern and central nepal

    OpenAIRE

    Iwata, Shuji; Miyamoto, Shinji; Kariya, Yoshihiko

    1996-01-01

    Dated charcoal and humic materials in soil, both of which are evidence of forest fire and vegetation changes, as well as pollen analysis of soil indicate occurrence of past deforestation in the Nepal Himalayas. In Sirubari, central Nepal, human impact such as population growth and cultural change may have accelerated an environmental change during the 14-15th centuries. In Junbesi and Phaplu, the Solu area of eastern Nepal, temporary deforestation caused by hunting and grazing is evident of h...

  4. DNA, the central molecule of aging.

    Science.gov (United States)

    Lenart, Peter; Krejci, Lumir

    2016-04-01

    Understanding the molecular mechanism of aging could have enormous medical implications. Despite a century of research, however, there is no universally accepted theory regarding the molecular basis of aging. On the other hand, there is plentiful evidence suggesting that DNA constitutes the central molecule in this process. Here, we review the roles of chromatin structure, DNA damage, and shortening of telomeres in aging and propose a hypothesis for how their interplay leads to aging phenotypes.

  5. Gas industry in Central and Eastern Europe

    Energy Technology Data Exchange (ETDEWEB)

    Razavi, H. [World Bank, Washington, DC (United States)

    1997-09-01

    The transition to a market economy in Central and Eastern Europe (CEE) has had many implications for the gas sector, in particular on the market development and prices, on the structure of the sector and on the investment level. The institutional and financial barriers to the development of CEE`s gas markets are summarized. Technical and marketing barriers are discussed, covering system design and integrity, metering, markets and energy efficiency. Finally, World Bank role and objectives are outlined. (R.P.)

  6. Regional Strategic Appraisal of Central America

    Science.gov (United States)

    2007-11-02

    originally consisted of five states that gained their independence from Spain in 1821 and formed a single country, called Central America Federation ...and in each case a civilian president has voluntarily yielded power to another elected civilian. Electoral processes have nearly acquired a “life of...Observatorio de Seguridad y Defensa en America Latina (OSAL), Instituto Universitario Ortega y Gasset. 38 Ibid. 26 BIBLIOGRAPHY Agosin, Manuel R., David

  7. Probabilistic seismic hazard assessment for Central Asia

    Directory of Open Access Journals (Sweden)

    Shahid Ullah

    2015-04-01

    Full Text Available Central Asia is one of the seismically most active regions in the world. Its complex seismicity due to the collision of the Eurasian and Indian plates has resulted in some of the world’s largest intra-plate events over history. The region is dominated by reverse faulting over strike slip and normal faulting events. The GSHAP project (1999, aiming at a hazard assessment on a global scale, indicated that the region of Central Asia is characterized by peak ground accelerations for 10% probability of exceedance in 50 years as high as 9 m/s2. In this study, carried out within the framework of the EMCA project (Earthquake Model Central Asia, the area source model and different kernel approaches are used for a probabilistic seismic hazard assessment (PSHA for Central Asia. The seismic hazard is assessed considering shallow (depth < 50 km seismicity only and employs an updated (with respect to previous projects earthquake catalog for the region. The seismic hazard is calculated in terms of macroseismic intensity (MSK-64, intended to be used for the seismic risk maps of the region. The hazard maps, shown in terms of 10% probability of exceedance in 50 years, are derived by using the OpenQuake software [Pagani et al. 2014], which is an open source software tool developed by the GEM (Global Earthquake Model foundation. The maximum hazard observed in the region reaches an intensity of around 8 in southern Tien Shan for 475 years mean return period. The maximum hazard estimated for some of the cities in the region, Bishkek, Dushanbe, Tashkent and Almaty, is between 7 and 8 (7-8, 8.0, 7.0 and 8.0 macroseismic Intensity, respectively, for 475 years mean return period, using different approaches. The results of different methods for assessing the level of seismic hazard are compared and their underlying methodologies are discussed.

  8. Two root canals in maxillary central incisor

    Directory of Open Access Journals (Sweden)

    Fábio de Almeida Gomes

    2011-07-01

    Full Text Available Introduction and objective: The success of endodontic treatment requires the knowledge of tooth morphology and its variations. Case report: This clinical article reports an unusual root canal configuration that was detected in a maxillary central incisor with two root canals, demonstrated by radiographic and computerized tomography exams. Conclusion: Knowledge of endodontic anatomy as well as the obtainment of both preoperative radiographs and tomography is important to detect abnormal tooth morphology.

  9. Central Nervous System Involvement in Whipple Disease

    OpenAIRE

    Compain, Caroline; Sacre, Karim; Puéchal, Xavier; Klein, Isabelle; Vital-Durand, Denis; Houeto, Jean-Luc; De Broucker, Thomas; Raoult, Didier; Papo, Thomas

    2013-01-01

    Abstract Whipple disease (WD) is a rare multisystemic infection with a protean clinical presentation. The central nervous system (CNS) is involved in 3 situations: CNS involvement in classic WD, CNS relapse in previously treated WD, and isolated CNS infection. We retrospectively analyzed clinical features, diagnostic workup, brain imaging, cerebrospinal fluid (CSF) study, treatment, and follow-up data in 18 patients with WD and CNS infection. Ten men and 8 women were included with a median ag...

  10. The Central Mystery of Quantum Mechanics

    OpenAIRE

    Ghose, Partha

    2009-01-01

    A critical re-examination of the double-slit experiment and its variants is presented to clarify the nature of what Feynmann called the ``central mystery'' and the ``only mystery'' of quantum mechanics, leading to an interpretation of complementarity in which a `wave {\\em and} particle' description rather than a `wave {\\em or} particle' description is valid for the {\\em same} experimental set up, with the wave culminating in the particle sequentially in time. This interpretation is different ...

  11. The central part of CMS is lowered

    CERN Multimedia

    Maximilien Brice

    2007-01-01

    On 28 February 2007, the CMS central piece containing the magnet and weighing as much as five Jumbo jets (1920 tonnes) was gently lowered into place. Only 20 cm separated the detector, which was suspended by four huge cables, each with 55 strands and sophisticated monitoring to minimize sway and tilt, from the walls of the shaft. The entire process took about 10 hours to complete.

  12. Central bank purchases of government bonds

    OpenAIRE

    Huber, Samuel; Kim, Jaehong

    2015-01-01

    We develop a microfounded model, where agents have the possibility to trade money for government bonds in an over-the-counter market. It allows us to address important open questions about the effects of central bank purchases of government bonds, these being: under what conditions these purchases can be welfare-improving, what incentive problems they mitigate, and how large these effects are. Our main finding is that this policy measure can be welfare-improving, by correcting a pecuniary ext...

  13. ACLED Country Report: Central African Republic

    Science.gov (United States)

    2015-01-01

    Rights Watch, 2014). This has led to reprisal attacks on the part of the Séléka, and targeting by both groups now frequent- ly focuses on the religion ... religion . The distribution of Figure 8: Conflict Events Involving the Anti-Balaka, Central African Republic, August 2013 - September 2014. The...of the country where Islam is the majority religion . Most of its members are Muslim, including leader Michel Djotodia, who served as president from

  14. Remote Control Research in Central Africa

    OpenAIRE

    Trefon, Theodore; Cogels, Serge

    2009-01-01

    This article explains how a project being implemented in peri-urban central Africa is coordinated from an office in Brussels. After an overview that addresses the conceptual challenges of defining ‘peri-urban’ and the question of why these social spaces are important from a development perspective, the article outlines ‘remote control research’ step-by-step: (i) conceptualisation, (ii) identification and recruitment of local experts, (iii) selection of research sites, (iv) the process of form...

  15. Tectonomagmatic Associations on the Central Andean Plateau

    Science.gov (United States)

    de Silva, S. L.; Viramonte, J. G.

    2012-12-01

    The Neogene evolution of the Central Andes is characterized by a strong association between plate convergence, mountain building and plateau formation, and magmatism. Plateau uplift by crustal shortening and thickening in the lower crust is broadly coincident with large scale silicic magmatism defined by the Neogene Central Andean ignimbrite province. Of particular interest here are the spatiotemporal correlations between silicic magmatism and tectonic evolution of the Altiplano-Puna plateau. Although magmatism is driven by the subduction-related flux from mantle to crust, the shift to "crustal" magmatism as indicated by elevated crustal isotopic indices after ~10Ma suggests a link between crustal thickening, plateau formation and silicic magmatism. In particular, elevated geotherms associated with crustal thickening and enhanced mantle flux associated with lithospheric delamination may have played a role in thermally preparing the Central Andean crust for enhanced silicic magma production during the extensive Neogene ignimbrite flare-up. Emplacement of these magmas in the upper crust throughout the Neogene may have fuelled a period of significant interaction between magmatism and tectonism on the plateau. With particular reference to the 21° to 24°S segment of the Central Andes, spatial and structural coincidence of calderas of the Altiplano Puna Volcanic Complex with the NW-SE striking Calama-Olacapata-El Toro fault zone suggests significant tectonomagmatic interaction. Location of calderas suggest that these regional faults focused magma intrusion and storage, while spatially and temporally correlated eruption pulses connote a tectonic control. Indeed, current thermomechanical models of magma chamber development and eruption triggering promote a role for external triggering of "perched" upper crustal magma chambers. This might have been achieved by melt-enhanced deformation, or alternatively, significant uplift (~1km) associated with the development of large

  16. Human Rights Training for Central Government Officials

    Institute of Scientific and Technical Information of China (English)

    OUR STAFF REPORTER

    2007-01-01

    @@ More than 50 officials from central government departments attended a human rights training class held in Nanchang,Jiangxi Province, on May 29-June 2. The class was sponsored by the State Council Information Office, during which the trainees attended lectures given on China's human rights concepts and the current human rights conditions in the country,human rights theories and international human rights instruments and protection of human rights under the rule of law.

  17. Central bank learning and monetary policy

    OpenAIRE

    Tesfaselassie, Mewael F.

    2008-01-01

    We analyze optimal monetary policy when a central bank has to learn about an unknown coefficient that determines the effect of surprise inflation on aggregate demand. We derive the optimal policy under active learning and compare it to two limiting cases---certainty equivalence policy and cautionary policy, in which learning takes place passively. Our novel result is that the two passive learning policies represent an upper and lower bound for the active learning policy, irrespective of the s...

  18. Central cortical cleanup and zonular deficiency

    Science.gov (United States)

    Mansour, Ahmad M; Antonios, Rafic S; Ahmed, Iqbal Ike K

    2016-01-01

    Background Complete removal of the cortex has been advocated to prevent posterior capsular opacification but carries the risk of zonular dehiscence, hence there is a need for a safe maximal cortical cleanup technique in eyes with severe diffuse zonulopathy in subjects above age 90. Methods We used bimanual central cortical cleaning by elevating central fibers and aspirating them toward the periphery. Peripheral cortical fibers were removed passively only when they became loose due to copious irrigation. A one-piece foldable implant was inserted without a capsular tension ring. Postoperative corticosteroid drops were used. Results This technique was safely performed in a dozen eyes with severe pseudo-exfoliation or brunescent cataract with weak zonules. Posterior capsular rupture, iritis, vitreous loss, and lens subluxation were not observed. Moderate capsular phimosis occurred but with maintained central vision. Conclusion The dogma of “complete cortical cleanup” in severe zonulopathy needs to be revisited in favor of a clear visual axis with maximal preservation of the damaged zonules. This technique is ideal in patients above age 90 where posterior capsular opacification and late dislocation of intraocular lens–capsule bag complex are unlikely to occur until several years postoperatively. PMID:27784979

  19. Central cortical cleanup and zonular deficiency

    Directory of Open Access Journals (Sweden)

    Mansour AM

    2016-10-01

    Full Text Available Ahmad M Mansour,1,2 Rafic S Antonios,1 Iqbal Ike K Ahmed3 1Department of Ophthalmology, American University of Beirut, Beirut, Lebanon; 2Department of Ophthalmology, Rafic Hariri University Hospital, Beirut, Lebanon; 3Department of Ophthalmology, University of Toronto, Toronto, ON, Canada Background: Complete removal of the cortex has been advocated to prevent posterior capsular opacification but carries the risk of zonular dehiscence, hence there is a need for a safe maximal cortical cleanup technique in eyes with severe diffuse zonulopathy in subjects above age 90. Methods: We used bimanual central cortical cleaning by elevating central fibers and aspirating them toward the periphery. Peripheral cortical fibers were removed passively only when they became loose due to copious irrigation. A one-piece foldable implant was inserted without a capsular tension ring. Postoperative corticosteroid drops were used. Results: This technique was safely performed in a dozen eyes with severe pseudo-exfoliation or brunescent cataract with weak zonules. Posterior capsular rupture, iritis, vitreous loss, and lens subluxation were not observed. Moderate capsular phimosis occurred but with maintained central vision. Conclusion: The dogma of “complete cortical cleanup” in severe zonulopathy needs to be revisited in favor of a clear visual axis with maximal preservation of the damaged zonules. This technique is ideal in patients above age 90 where posterior capsular opacification and late dislocation of intraocular lens–capsule bag complex are unlikely to occur until several years postoperatively. Keywords: brunescent cataract, cortex aspiration, phacoemulsification, pseudo-exfoliation, weak zonules

  20. Tuberculoma of the central nervous system.

    Science.gov (United States)

    DeLance, Arthur R; Safaee, Michael; Oh, Michael C; Clark, Aaron J; Kaur, Gurvinder; Sun, Matthew Z; Bollen, Andrew W; Phillips, Joanna J; Parsa, Andrew T

    2013-10-01

    Tuberculosis is among the oldest and most devastating infectious diseases worldwide. Nearly one third of the world's population has active or latent disease, resulting in 1.5 million deaths annually. Central nervous system involvement, while rare, is the most severe form of tuberculosis. Manifestations include tuberculoma and tuberculous meningitis, with the majority of cases occurring in children and immunocompromised patients. Despite advancements in imaging and laboratory diagnostics, tuberculomas of the central nervous system remain a diagnostic challenge due to their insidious nature and nonspecific findings. On imaging studies tuberculous meningitis is characterized by diffuse basal enhancement, but tuberculomas may be indistinguishable from neoplasms. Early diagnosis is imperative, since clinical outcomes are largely dependent on timely treatment. Stereotactic biopsy with histopathological analysis can provide a definitive diagnosis, but is only recommended when non-invasive methods are inconclusive. Standard medical treatment includes rifampicin, isoniazid, pyrazinamide, and streptomycin or ethambutol. In cases of drug resistance, revision of the treatment regimen with second-line agents is recommended over the addition of a single drug to the first-line regimen. Advances in genomics have identified virulent strains of tuberculosis and are improving our understanding of host susceptibility. Neurosurgical referral is advised for patients with elevated intracranial pressure, seizures, or brain or spinal cord compression. This review synthesizes pertinent findings in the literature surrounding central nervous system tuberculoma in an effort to highlight recent advances in pathophysiology, diagnosis, and treatment.

  1. Visibility of the central canal on MRI

    Energy Technology Data Exchange (ETDEWEB)

    Petit-Lacour, M.C.; Lasjaunias, P.; Iffenecker, C.; Benoudiba, F.; Hadj Rabia, M.; Doyon, D. [Service de Neuroradiologie, Faculte de Paris Sud (France); Hurth, M. [Department of Neurosurgery, Faculte Paris Sud, Kremlin-Bicetre (France)

    2000-10-01

    The central canal of the spinal cord is present at birth and becomes progressively obliterated. Cadaver studies have shown that it may persiste partially or completely. To our knowledge, this entity has not been described on MRI. We reviewed 794 MRI studies of the spinal cord, and found 12 patients (aged 14 to 65 years) who had an intramedullary cavity. The cavity was at the junction of the ventral {sup 1}/{sub 3} and dorsal {sup 2}/{sub 3} of the spinal cord, except at the level of the lumbar enlargement, where it was central. It was filiform in most cases, although sometimes fusiform (3 to 4 mm in diameter), and had regular contours. The cavity were thoracic in 69 % of cases. The clinical features were totally unrelated to the image, and there were no anatomical factors (Chiari malformation, dysraphism) predisposing to syringomyelia. The images were perfectly compatible with a persistent central canal, which we interpret as a variant of normal anatomy. Therefore it is important to regard these findings as normal, to avoid unnecessary treatment and follow-up. (orig.)

  2. HEALTH, VITAL GOALS, AND CENTRAL HUMAN CAPABILITIES

    Science.gov (United States)

    Venkatapuram, Sridhar

    2013-01-01

    I argue for a conception of health as a person's ability to achieve or exercise a cluster of basic human activities. These basic activities are in turn specified through free-standing ethical reasoning about what constitutes a minimal conception of a human life with equal human dignity in the modern world. I arrive at this conception of health by closely following and modifying Lennart Nordenfelt's theory of health which presents health as the ability to achieve vital goals. Despite its strengths I transform Nordenfelt's argument in order to overcome three significant drawbacks. Nordenfelt makes vital goals relative to each community or context and significantly reflective of personal preferences. By doing so, Nordenfelt's conception of health faces problems with both socially relative concepts of health and subjectively defined wellbeing. Moreover, Nordenfelt does not ever explicitly specify a set of vital goals. The theory of health advanced here replaces Nordenfelt's (seemingly) empty set of preferences and society-relative vital goals with a human species-wide conception of basic vital goals, or ‘central human capabilities and functionings’. These central human capabilities come out of the capabilities approach (CA) now familiar in political philosophy and economics, and particularly reflect the work of Martha Nussbaum. As a result, the health of an individual should be understood as the ability to achieve a basic cluster of beings and doings—or having the overarching capability, a meta-capability, to achieve a set of central or vital inter-related capabilities and functionings. PMID:22420910

  3. A Quaternary fault database for central Asia

    Science.gov (United States)

    Mohadjer, Solmaz; Ehlers, Todd Alan; Bendick, Rebecca; Stübner, Konstanze; Strube, Timo

    2016-02-01

    Earthquakes represent the highest risk in terms of potential loss of lives and economic damage for central Asian countries. Knowledge of fault location and behavior is essential in calculating and mapping seismic hazard. Previous efforts in compiling fault information for central Asia have generated a large amount of data that are published in limited-access journals with no digital maps publicly available, or are limited in their description of important fault parameters such as slip rates. This study builds on previous work by improving access to fault information through a web-based interactive map and an online database with search capabilities that allow users to organize data by different fields. The data presented in this compilation include fault location, its geographic, seismic, and structural characteristics, short descriptions, narrative comments, and references to peer-reviewed publications. The interactive map displays 1196 fault traces and 34 000 earthquake locations on a shaded-relief map. The online database contains attributes for 123 faults mentioned in the literature, with Quaternary and geodetic slip rates reported for 38 and 26 faults respectively, and earthquake history reported for 39 faults. All data are accessible for viewing and download via http://www.geo.uni-tuebingen.de/faults/. This work has implications for seismic hazard studies in central Asia as it summarizes important fault parameters, and can reduce earthquake risk by enhancing public access to information. It also allows scientists and hazard assessment teams to identify structures and regions where data gaps exist and future investigations are needed.

  4. A Quaternary Fault Database for Central Asia

    Science.gov (United States)

    Mohadjer, S.; Ehlers, T. A.; Bendick, R.; Stübner, K.; Strube, T.

    2015-09-01

    Earthquakes represent the highest risk in terms of potential loss of lives and economic damage for Central Asian countries. Knowledge of fault location and behavior is essential in calculating and mapping seismic hazard. Previous efforts in compiling fault information for Central Asia have generated a large amount of data that are published in limited-access journals with no digital maps publicly available, or are limited in their description of important fault parameters such as slip rates. This study builds on previous work by improving access to fault information through a web-based interactive map and an online database with search capabilities that allow users to organize data by different fields. The data presented in this compilation include fault location, its geographic, seismic and structural characteristics, short descriptions, narrative comments and references to peer-reviewed publications. The interactive map displays 1196 fault segments and 34 000 earthquake locations on a shaded-relief map. The online database contains attributes for 122 faults mentioned in the literature, with Quaternary and geodetic slip rates reported for 38 and 26 faults respectively, and earthquake history reported for 39 faults. This work has implications for seismic hazard studies in Central Asia as it summarizes important fault parameters, and can reduce earthquake risk by enhancing public access to information. It also allows scientists and hazard assessment teams to identify structures and regions where data gaps exist and future investigations are needed.

  5. Temporal node centrality in complex networks

    Science.gov (United States)

    Kim, Hyoungshick; Anderson, Ross

    2012-02-01

    Many networks are dynamic in that their topology changes rapidly—on the same time scale as the communications of interest between network nodes. Examples are the human contact networks involved in the transmission of disease, ad hoc radio networks between moving vehicles, and the transactions between principals in a market. While we have good models of static networks, so far these have been lacking for the dynamic case. In this paper we present a simple but powerful model, the time-ordered graph, which reduces a dynamic network to a static network with directed flows. This enables us to extend network properties such as vertex degree, closeness, and betweenness centrality metrics in a very natural way to the dynamic case. We then demonstrate how our model applies to a number of interesting edge cases, such as where the network connectivity depends on a small number of highly mobile vertices or edges, and show that our centrality definition allows us to track the evolution of connectivity. Finally we apply our model and techniques to two real-world dynamic graphs of human contact networks and then discuss the implication of temporal centrality metrics in the real world.

  6. The Centralizer on H- Separable Smash Products

    Institute of Scientific and Technical Information of China (English)

    祝家贵

    2002-01-01

    Let H be a finite dimensional Hopf algebra over a field and A an H-module algebra. The H induces an action on the CA#H(A) by adjoint and CA#H(A)H= Z(A # H) = C,where CA#H(A) denotes the centralizer which algebra A in A # H and Z(A # H) the center of A # H.The aim of this paper is to discuss ,the Galois conditions on the centralizer CA# H(A).We prove that CA# H(A)/ZA # H is H* -Galois if and only if CA# H(A)# H/CA# H(A) is H-separable). Furthermore , if H is a finite dimensional semisimple Hopf algebra and CA# H(A)# H is an Azumaya C-algebra or A # H/A is H-separable, CA# H(A) satisfies the double centralizer property in CA# H(A)# H, CA# H(A)/C is separable and there exists a cocommutative left integral t ∈∫1H,then CA# H(A)/C is H*-Galois.

  7. A Quaternary Fault Database for Central Asia

    Directory of Open Access Journals (Sweden)

    S. Mohadjer

    2015-09-01

    Full Text Available Earthquakes represent the highest risk in terms of potential loss of lives and economic damage for Central Asian countries. Knowledge of fault location and behavior is essential in calculating and mapping seismic hazard. Previous efforts in compiling fault information for Central Asia have generated a large amount of data that are published in limited-access journals with no digital maps publicly available, or are limited in their description of important fault parameters such as slip rates. This study builds on previous work by improving access to fault information through a web-based interactive map and an online database with search capabilities that allow users to organize data by different fields. The data presented in this compilation include fault location, its geographic, seismic and structural characteristics, short descriptions, narrative comments and references to peer-reviewed publications. The interactive map displays 1196 fault segments and 34 000 earthquake locations on a shaded-relief map. The online database contains attributes for 122 faults mentioned in the literature, with Quaternary and geodetic slip rates reported for 38 and 26 faults respectively, and earthquake history reported for 39 faults. This work has implications for seismic hazard studies in Central Asia as it summarizes important fault parameters, and can reduce earthquake risk by enhancing public access to information. It also allows scientists and hazard assessment teams to identify structures and regions where data gaps exist and future investigations are needed.

  8. Centrally acting antihypertensive agents: an update.

    Science.gov (United States)

    Sica, Domenic A

    2007-05-01

    Centrally acting agents stimulate alpha(2) receptors and/or imadozoline receptors on adrenergic neurons situated within the rostral ventrolateral medulla and, in so doing, sympathetic outflow is reduced. Centrally acting agents also stimulate peripheral alpha(2) receptors, which, for the most part, is of marginal clinical significance. Central a agonists have had a lengthy history of use, starting with alpha-methyldopa, which has had a dramatic decline in use, in part, because of bothersome side effects. Patients who require multidrug therapy with otherwise resistant hypertension, such as diabetic and/or renal failure patients, are typically responsive to these drugs, as are patients with sympathetically driven forms of hypertension. Perioperative forms of hypertension respond well to clonidine, a circumstance where the additional anesthesia- and analgesia-sparing effects of this drug may offer additional clinical benefits. Clonidine can be used adjunctively with other more traditional therapies in heart failure, particularly when hypertension is present. Sustained-release moxonidine, however, is associated with early mortality and morbidity when used in patients with heart failure. Escalating doses of drugs in this class often give rise to salt and water retention, in which case diuretic therapy becomes a valuable adjunctive therapy.

  9. Temporal diversification of Central American cichlids

    Directory of Open Access Journals (Sweden)

    Hulsey C Darrin

    2010-09-01

    Full Text Available Abstract Background Cichlid fishes are classic examples of adaptive radiation because of their putative tendency to explosively diversify after invading novel environments. To examine whether ecological opportunity increased diversification (speciation minus extinction early in a species-rich cichlid radiation, we determined if Heroine cichlids experienced a burst of diversification following their invasion of Central America. Results We first reconstructed the Heroine phylogeny and determined the basal node to use as the root of Central American Heroine diversification. We then examined the influence of incomplete taxon sampling on this group's diversification patterns. First, we added missing species randomly to the phylogeny and assessed deviations from a constant rate of lineage accumulation. Using a range of species numbers, we failed to recover significant deviations from a pure-birth process and found little support for an early burst of diversification. Then, we examined patterns of lineage accumulation as nodes were increasingly truncated. We assumed that as we removed more recently diverged lineages that sampling would become more complete thereby increasing the power to detect deviations from a pure-birth model. However, truncation of nodes provided even less support for an early burst of diversification. Conclusions Contrary to expectations, our analyses suggest Heroine cichlids did not undergo a burst of diversification when they invaded from South America. Throughout their history in Central America, Heroine cichlids appear to have diversified at a constant rate.

  10. Decreased central corneal thickness in ankylosing spondylitis.

    Science.gov (United States)

    Ortak, Huseyin; Inanır, Ahmet; Demir, Selim; Uysal, Alper; Şahin, Şafak; Sağcan, Mustafa; Önder, Yalçın; Alim, Sait; Demir, Ayşe Kevser

    2014-04-01

    Central corneal thickness and dry eye tests were evaluated in a study population consisting of 68 ankylosing spondylitis patients diagnosed according to the modified New York criteria, and 61 age-matched controls without ankylosing spondylitis. A full ophthalmological evaluation was performed on each subject. All subjects were screened for age, gender, HLA-B27, tear break-up time test, Schirmer test, and duration of disease. Central corneal thickness was measured under topical anesthesia with an ultrasonic pachymeter. The mean central corneal thickness was 537.3 ± 30.6 μm, range 462-600 μm, in ankylosing spondylitis patients, whereas it was 551.7 ± 25.2 μm, range 510-620 μm, in controls (p = 0.005). The Schirmer test result was 7.3 ± 5.9 mm for the ankylosing spondylitis patients and 11.7 ± 5.8 mm for the control group (p = 0.002). Tear break-up time was 7.3 ± 3.2 s for the ankylosing spondylitis patients and 14.0 ± 4.5 s for the control group (p ankylosing spondylitis. In addition, attention must be given to lower dry eye tests in surgical interventions such as photorefractive keratectomy and laser in situ keratomileusis in ankylosing spondylitis patients.

  11. Health, vital goals, and central human capabilities.

    Science.gov (United States)

    Venkatapuram, Sridhar

    2013-06-01

    I argue for a conception of health as a person's ability to achieve or exercise a cluster of basic human activities. These basic activities are in turn specified through free-standing ethical reasoning about what constitutes a minimal conception of a human life with equal human dignity in the modern world. I arrive at this conception of health by closely following and modifying Lennart Nordenfelt's theory of health which presents health as the ability to achieve vital goals. Despite its strengths I transform Nordenfelt's argument in order to overcome three significant drawbacks. Nordenfelt makes vital goals relative to each community or context and significantly reflective of personal preferences. By doing so, Nordenfelt's conception of health faces problems with both socially relative concepts of health and subjectively defined wellbeing. Moreover, Nordenfelt does not ever explicitly specify a set of vital goals. The theory of health advanced here replaces Nordenfelt's (seemingly) empty set of preferences and society-relative vital goals with a human species-wide conception of basic vital goals, or 'central human capabilities and functionings'. These central human capabilities come out of the capabilities approach (CA) now familiar in political philosophy and economics, and particularly reflect the work of Martha Nussbaum. As a result, the health of an individual should be understood as the ability to achieve a basic cluster of beings and doings-or having the overarching capability, a meta-capability, to achieve a set of central or vital inter-related capabilities and functionings.

  12. Rhabdoid tumors of the central nervous system.

    Science.gov (United States)

    Reinhardt, D; Behnke-Mursch, J; Weiss, E; Christen, H J; Kühl, J; Lakomek, M; Pekrun, A

    2000-04-01

    Rhabdoid tumors of the central nervous system are rare malignancies with a still almost uniformly fatal outcome. There is still no proven curative therapy available. We report our experience with nine patients with central nervous system rhabdoid tumors. Gross complete surgical removal of the tumor was achieved in six patients. Seven patients received intensive chemotherapy. Four of these were treated in addition with both neuroaxis radiotherapy and a local boost directed to the tumor region, while two patients received local radiotherapy only. The therapy was reasonably well tolerated in most cases. Despite the aggressive therapy, eight of the nine patients died from progressive tumor disease, and one patient died from hemorrhagic brain stem lesions of unknown etiology. The mean survival time was 10 months after diagnosis. Conventional treatment, although aggressive, cannot change the fatal prognosis of central nervous system rhabdoid tumors. As these neoplasms are so rare, a coordinated register would probably be a good idea, offering a means of learning more about the tumor's biology and possible strategies of treatment.

  13. Comparing Central Peak and Central Pit Craters on Mercury and Mars: Implications for Crustal Strength

    Science.gov (United States)

    Barlow, Nadine G.; Horstman, Ryan M.

    2016-10-01

    We have measured and classified 20,782 impact craters on Mercury and 24,495 craters on Mars 5 km in diameter and larger for a comparison study of these features. We identified 1144 floor pit and 638 summit pit craters on Mars and 32 summit pit craters but no floor pits on Mercury. We also identified 1682 central peak craters on Mars and 1764 on Mercury. We computed the ratio of the pit or basal peak diameter to the crater diameter in each case and compared the results for the two bodies. Summit pits on Mars have a median pit-to-crater diameter (Dp/Dc) ratio of 0.12 compared to 0.09 on Mercury, indicating pits are slightly larger relative to their parent crater on Mars. We find no correlation of the distribution of Mercury's central pits with features attributed to volatiles, i.e. radar-bright polar craters and craters containing hollows. This indicates that Mercury's central pits form by collapse of a weak brecciated core in the central peak and do not require the presence of volatiles, as is commonly assumed for central pit formation. The median peak-to-crater diameter (Dpk/Dc) ratio for the peaks on which summit pits are found on both bodies is statistically identical to that of the respective normal unpitted central peaks. This indicates that the peaks on which summit pits occur form in the same manner as normal central peaks but subsequently undergo core collapse to create the summit pit. Interestingly, the median Dpk/Dc for Martian peaks is twice as high as for their Mercurian counterparts (0.30 versus 0.15, respectively). Because Mercury and Mars have essentially the same surface gravity, the only major difference between the two bodies that could explain this observation is target characteristics. Prior studies of the composition of the crust and the detection of larger-than-normal secondary craters have led to the proposal that Mercury's crust is stronger than the crusts of the other terrestrial planets. Mercury's low number of central pit craters, the

  14. Central Asian Gypsies: identities and migrations

    Directory of Open Access Journals (Sweden)

    Elena Marushiakova

    2015-12-01

    Full Text Available Central Asian Gypsies: identities and migrations During recent years the topic of Gypsy/Roma migration and identities became burning topic of pan-EUropean public discourse. Much less attention is paid to the Gypsy migrations outside the borders of European Union. The present article has ambitious goal to fulfill this gap and to present contemporary Gypsy migrations in Post-soviet Central Asian in order to see how this “burning” topic looks outside European space. After breakdown of Soviet Union and establishing of new independent republics in Central Asia and in connection to economical difficulties, wars and social unrest, in order to make their living, the communities of Central Asian ‘Gypsies’ revitalised their former nomadic traditions and migrate towards Russian Federation and in frames of Central Asia towards Kazakhstan. There they are earning their living through begging and sporadic work in construction and scrap collection. A central point of this article is the impact of these contemporary migrations on the development of identities and well being of Central Asian ‘Gypsies’. The multilevel, hierarchically structured identities of Central-Asian ‘Gypsies' are analysed as demonstrated in different historical contexts – as former “Soviet people”, member of former ruling class of agricultural proletariat, and as declassed community today; as Central-Asian ‘Gypsies’ or as citizens of respective Central Asian Republics during migrations in Russian Federation in front of Russian majority society and in front of Roma; and in context of the Central Asian region during the migrations to Kazakhstan and in their home countries.     Cyganie środkowoazjatyccy – tożsamości i migracje W ostatnich latach tematyka migracji i tożsamości Cyganów (Romów stała się tematem palącym w unijnoeuropejskim dyskursie publicznym. O wiele mniej uwagi poświęca się w nim migracjom Cyganów, które mają miejsce poza granicami

  15. 30 years in the Veracruz state coast landscape: Laguna Verde nuclear power station. 1. ed.; 30 anos de paisaje costero veracruzano: Central Nucleoelectrica Laguan Verde

    Energy Technology Data Exchange (ETDEWEB)

    Guevara, S; Moreno Casasola, P; Castillo Campos, G; Dorantes, C; Gonzalez Garcia, F; Halffter, G; Isunza, E; Lot H, A; Mendoza, R; Paradowska, K; Priego, A; Sanchez Vigil, C; Vazquez, G [Comision Federal de Electricidad and Instituto Nacional de Ecologia A.C. (Mexico)

    2008-07-01

    results of the environmental measurements also demonstrate that the nuclear option of electrical energy generation, when it is operated with safety and efficiency, is one of the friendlier forms with the environment of power generation. [Spanish] Hace 36 anos nacio uno de los proyectos energeticos mas importantes de Mexico; el diseno y construccion de la Central Nuclear Laguna Verde. Este proyecto se volvio realidad gracias al compromiso de un grupo de profesionistas mexicanos que dieron lo mejor de ellos para su realizacion. En Mexico no existia en ese momento una legislacion que contemplara la proteccion del medio ambiente; sin embargo, la Constitucion preve que cuando en el pais no exista legislacion para el desarrollo de un proyecto. Este debe adoptar la legislacion del pais que lo esta vendiendo. En el caso especifico de Laguna Verde, se adopto la legislacion de los Estados Unidos de America y en la parte ambiental se tuvo que realizar el primer Manifiesto de Impacto Ambiental, que se titulo Informe ambiental para la construccion de la Central Nuclear Laguna Verde en el Estado de Veracruz. Este estudio lo realizaron varias instituciones tanto nacionales como extranjeras. Entre las mas sobresalientes se cuenta con: la Universidad Nacional autonoma de Mexico, el Instituto Politecnico Nacional, la Universidad Veracruzana, el Instituto Nacional para la Investigacion de los Recursos Biologicos, el Instituto de Ecologia, A.C. Con este informe, los ingenieros se dieron a la tarea de disenar y construir, los biologos y ecologos a realizar los estudios para mitigar los efectos causados al medio ambiente durante la construccion y, posteriormente, durante la operacion de la Central Nuclear. Despues de 18 anos de operacion comercial de la central se concluye el presente libro, en el cual se comparan los resultados obtenidos en 1972, cuando se iniciaron los estudios para el informe ambiental, contra los obtenidos a lo largo de este periodo. Es importante ver en los resultados de

  16. Ganymede crater dimensions - Implications for central peak and central pit formation and development

    Science.gov (United States)

    Bray, Veronica J.; Schenk, Paul M.; Jay Melosh, H.; Morgan, Joanna V.; Collins, Gareth S.

    2012-01-01

    The morphology of impact craters on the icy Galilean satellites differs from craters on rocky bodies. The differences are thought due to the relative weakness of ice and the possible presence of sub-surface water layers. Digital elevation models constructed from Galileo images were used to measure a range of dimensions of craters on the dark and bright terrains of Ganymede. Measurements were made from multiple profiles across each crater, so that natural variation in crater dimensions could be assessed and averaged scaling trends constructed. The additional depth, slope and volume information reported in this work has enabled study of central peak formation and development, and allowed a quantitative assessment of the various theories for central pit formation. We note a possible difference in the size-morphology progression between small craters on icy and silicate bodies, where central peaks occur in small craters before there is any slumping of the crater rim, which is the opposite to the observed sequence on the Moon. Conversely, our crater dimension analyses suggest that the size-morphology progression of large lunar craters from central peak to peak-ring is mirrored on Ganymede, but that the peak-ring is subsequently modified to a central pit morphology. Pit formation may occur via the collapse of surface material into a void left by the gradual release of impact-induced volatiles or the drainage of impact melt into sub-crater fractures.

  17. Experiencia del Banco Central Autónomo

    OpenAIRE

    Daniel Tapia

    1993-01-01

    Four years after the Central Bank of Chile started operating under its new law of autonomy, the principal characteristic that emerges, under this article's view, is the fragility of its balance. Whereas central banks usually operate as in textbooks, with

  18. How do they become nodes? Revisiting team member network centrality.

    Science.gov (United States)

    Liu, Yuwen; Ipe, Minu

    2010-01-01

    The present study examines the antecedents of team member network centrality using a sample of 207 team members. Team member network centrality indicates how closely the individual is linked to others in the group. The authors investigated the role of personality traits, interpersonal citizenship behavior (ICB), education, and team tenure on an individual's network centrality. The authors also examined the mediating effect of ICB on the relationship between personality traits and team member network centrality. Results supported the relation between (a) personal traits--conscientiousness and agreeableness--and (b) ICB and network centrality. In addition, ICB mediated the relation between conscientiousness and network centrality and between agreeableness and network centrality, respectively. That is, people who are more conscientious and agreeable manifest more ICB and therefore more possibly become nodes within their teams' social network. Further, results supported the idea that education and team tenure are positively related to network centrality. The authors discuss the theoretical contributions and implications.

  19. Distributed generation and centralized power system in Thailand

    DEFF Research Database (Denmark)

    Sukkumnoed, Decharut

    The paper examines and discusses conflicts between the development of distributed power and centralized power system in Thailand.......The paper examines and discusses conflicts between the development of distributed power and centralized power system in Thailand....

  20. Distributed generation and centralized power system in Thailand

    DEFF Research Database (Denmark)

    Sukkumnoed, Decharut

    2004-01-01

    The paper examines and discusses conflicts between the development of distributed power and centralized power system.......The paper examines and discusses conflicts between the development of distributed power and centralized power system....

  1. Measured compaction for 24 extensometers in the Central Valley

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This digital dataset contains the compaction data for 24 extensometers used for observations in the Central Valley Hydrologic Model (CVHM). The Central Valley...

  2. Evapotranspiration Input Data for the Central Valley Hydrologic Model (CVHM)

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This digital dataset contains monthly reference evapotranspiration (ETo) data for the Central Valley Hydrologic Model (CVHM). The Central Valley encompasses an...

  3. Septic arthritis in the central part of Denmark

    DEFF Research Database (Denmark)

    Asmussen Andreasen, Rikke; Andersen, Nanna Skaarup; Just, Søren Andreas;

    Septic arthritis in the central part of Denmark, Annals of the Rheumatic Diseases, volume 73, supplement 2, p. 287......Septic arthritis in the central part of Denmark, Annals of the Rheumatic Diseases, volume 73, supplement 2, p. 287...

  4. Central motor conduction in brachial monomelic amyotrophy

    Directory of Open Access Journals (Sweden)

    Pal Pramod

    2008-01-01

    Full Text Available Background: Prevalence of subclinical involvement of motor pathways in clinically diagnosed Brachial Monomelic Amyotrophy (BMMA is unknown. Aims: To determine the prevalence of subclinical involvement of central motor pathways in BMMA using transcranial magnetic stimulation. Setting and Design: Prospective case-control study. Materials and Methods: Central motor conduction time (CMCT was determined by ′F′ wave method using figure-of-eight coil attached to Magstim 200 stimulator, in 17 patients with BMMA. Motor evoked potentials were recorded from first dorsal interosseous of the affected (AFF and unaffected upper limbs (UNAFF at rest and during partial contraction. Comparison was made with data from 10 healthy controls (CTRL. Statistical Analysis: Descriptive analysis and Analysis of Variance (ANOVA. Results: Compared to controls, the mean CMCT of AFF was significantly prolonged, both at rest and contraction: (a Rest: AFF-6.68±1.78 ms, UNAFF-6.36±1.16 ms, CTRL-5.71±1.02 ms; Fisher′s PLSD for AFF vs. CTRL: P =0.037, (b Contraction: AFF-5.78±1.62 ms, UAFF - 4.86±1.38 ms, CTRL-4.06±0.80 ms; Fisher′s PLSD for AFF vs. CTRL; P =0.0002, AFF vs. UNAFF- P =0.044. Prolonged CMCT (>mean+2SD of controls was observed in 29.4% of AFF and 6.25% of UNAFF at rest, and in 47.1% and 23.5% respectively during contraction. Conclusions: Dysfunction of central motor pathways was observed in both affected and unaffected upper limbs of some patients with BMMA of upper limbs. The dysfunction was more pronounced during voluntary contraction. A larger study is needed to validate the significance of these findings.

  5. Angiotensin II during experimentally simulated central hypovolemia

    Directory of Open Access Journals (Sweden)

    Theo Walther Jensen

    2016-03-01

    Full Text Available Abstract:Central hypovolemia, defined as diminished blood volume in the heart and pulmonary vascular bed, is still an unresolved problem from a therapeutic point of view. The development of pharmaceutical agents targeted at specific angiotensin II receptors, like the non-peptidergic AT2-receptor agonist compound 21, is yielding many opportunities to uncover more knowledge about angiotensin II receptor profiles and possible therapeutic use. Cardiovascular, anti-inflammatory and neuroprotective therapeutic use of compound 21 have been suggested. However, there has not yet been a focus on the use of these agents in a hypovolemic setting. We argue that the latest debates on the effect of angiotensin II during hypovolemia might guide for future studies investigating the effect of such agents during experimentally simulated central hypovolemia. The purpose of this review is to examine the role of angiotensin II during episodes of central hypovolemia.To examine this, we reviewed results from studies with three experimental models of simulated hypovolemia: head up tilt table test, lower body negative pressure, and hemorrhage of animals. A systemic literature search was made with the use of PubMed/MEDLINE for studies that measured variables of the renin-angiotensin system or its effect during simulated hypovolemia. 12 articles, using one of the three models, were included and showed a possible organ protective effect and an effect on the sympathetic system of angiotensin II during hypovolemia. The results support the possible organ protective vasodilatory role for the AT2-receptor during hypovolemia on both the kidney and the splanchnic tissue.

  6. The Case of NRENs in Central Asia

    Directory of Open Access Journals (Sweden)

    Robert Franciscus Janz

    2012-07-01

    Full Text Available National Research and Education Network organizations (NRENs provide advanced information and communication technology (ICT services for the academic community of their country. Their focus is often on providing affordable high speed bandwidth amongst their members and to other research networks, but NRENs also provide other advanced services such as electronic repositories, educational environments and supercomputing facilities. Higher Education and Research institutions have to play an active role in the transformation to the “Knowledge Society”. A recent (2010 report of the International Telecommunication Union has identified NRENs as important vehicles in reaching the goals of the World Summit of the Information Society. It is also demonstrated that the Central Asian countries score very low in the Networked Readiness Indices of the World Economic Forum, including areas where strong NRENs could improve the status quo. NRENs therefore have a role that is also important for the nation itself and therefore claims for government support are legitimate. About 62% of the countries of the world already have an NREN and there are four characteristics that are common to these NRENs. In nearly all of the cases the NREN is a not-for-profit organization that not only serves the academic community, but is also owned by the same community. Four out of five Central Asian countries have an active NREN and these NRENs all participate in the EC funded CAREN project that aims to set up a sustainable regional network for the academic communities in the participating countries. Today, the Central Asian Research and Education Network (CAREN is upgrading the ancient Silk Road to a 21st-century high-speed internet highway for research and educational institutions through the region. Operational since July 2010, CAREN currently interconnects scientists and students from Kazakhstan, Kyrgyzstan, Tajikistan, and Turkmenistan.

  7. HIS Central and the Hydrologic Metadata Catalog

    Science.gov (United States)

    Whitenack, T.; Zaslavsky, I.; Valentine, D. W.

    2008-12-01

    The CUAHSI Hydrologic Information System project maintains a comprehensive workflow for publishing hydrologic observations data and registering them to the common Hydrologic Metadata Catalog. Once the data are loaded into a database instance conformant with the CUAHSI HIS Observations Data Model (ODM), the user configures ODM web service template to point to the new database. After this, the hydrologic data become available via the standard CUAHSI HIS web service interface, that includes both data discovery (GetSites, GetVariables, GetSiteInfo, GetVariableInfo) and data retrieval (GetValues) methods. The observations data then can be further exposed via the global semantics-based search engine called Hydroseek. To register the published observations networks to the global search engine, users can now use the HIS Central application (new in HIS 1.1). With this online application, the WaterML-compliant web services can be submitted to the online catalog of data services, along with network metadata and a desired network symbology. Registering services to the HIS Central application triggers a harvester which uses the services to retrieve additional network metadata from the underlying ODM (information about stations, variables, and periods of record). The next step in HIS Central application is mapping variable names from the newly registered network, to the terms used in the global search ontology. Once these steps are completed, the new observations network is added to the map and becomes available for searching and querying. The number of observations network registered to the Hydrologic Metadata Catalog at SDSC is constantly growing. At the time of submission, the catalog contains 51 registered networks, with estimated 1.7 million stations.

  8. El glaciarismo pleistoceno del Sistema Central

    OpenAIRE

    Pedraza Gilsanz, Javier; Carrasco, Rosa María

    2006-01-01

    El Sistema Central Español es una montaña intraplaca, originada por la reactivación de una antigua penillanura durante la orogenia Alpina. Sus cimas alomadas tienen una altura media de 1700-1800 m, en algunos sectores 1900-2000 m y en macizos locales pueden llegar a los 2300-2500 m; se trata por tanto de una montaña media, de ambiente mediterráneo continentalizado. Exceptuando Gata-Peña de Francia, en los macizos culminante de los demás sectores aparecen morfologías glaciares bien desarrol...

  9. Central limit theorems under special relativity.

    Science.gov (United States)

    McKeague, Ian W

    2015-04-01

    Several relativistic extensions of the Maxwell-Boltzmann distribution have been proposed, but they do not explain observed lognormal tail-behavior in the flux distribution of various astrophysical sources. Motivated by this question, extensions of classical central limit theorems are developed under the conditions of special relativity. The results are related to CLTs on locally compact Lie groups developed by Wehn, Stroock and Varadhan, but in this special case the asymptotic distribution has an explicit form that is readily seen to exhibit lognormal tail behavior.

  10. Measurements of organic acids over central Germany

    Science.gov (United States)

    Hartmann, W. R.; Andreae, M. O.; Helas, G.

    During three flights over central western Germany, air samples were taken for determination of organic acids. In air masses rapidly adverting from the west, between 0.15 and 3 km altitude mixing ratios of 0.17±0.06 ppbv formic acid and 0.72±0.08 ppbv acetic acid were found. In a local high pressure system mixing ratios increased up to 2.76 ppbv for formic acid and 2.20 ppbv for acetic acid.

  11. Discos en estrellas centrales de nebulosas planetarias

    Science.gov (United States)

    Saker, L.; Gómez, M.

    2016-08-01

    With the aim of investigating the possible existence of disks in the central stars of planetary nebulae (CSPN), in this contribution we present the spectral energy distributions of ten CSPN that show infrared (IR) excesses. Basic parameters of the disks such as internal radius and temperature are derived. When comparing the characteristics of these disks with the previously found around white dwarfs, it was found that the latter are significantly smaller. The disk sizes are compared with associated nebula. In general, disks are very compact and small in relation to the characteristic dimension of the nebula.

  12. Radionuclides at Descartes in the central highlands

    Science.gov (United States)

    Wrigley, R. C.

    1973-01-01

    Throium, uranium, potassium, aluminium-26, and sodium-22 were measured by nondestructive gamma ray spectrometry in six soil and two rock samples gathered by Apollo 16 in the lunar central highlands. The soil samples probably include both major geologic formations in the vicinity, the Cayley and Descartes Formations, although it is possible that the Descartes Formation is not represented. The rock samples have low concentrations of primordial radionuclides. The Al concentrations were lower than could be expected from the high abundance of alumina in the Apollo 16 soils reported earlier, but this could be due to lower concentrations of target elements in these soils, sampling depth variations, or regolithic mixing (exposure age variations).

  13. Performance evaluation of Central European companies

    Directory of Open Access Journals (Sweden)

    Petr Fiala

    2015-10-01

    Full Text Available The paper presents a modelling approach for performance comparison of Central European companies on three levels: country, industry, and company. The approach is based on Data Envelopment Analysis and Analytic Hierarchy Process. The proposed model consists of two basic sections. The first section estimates the importance of selected industries in the countries, whereas the second section evaluates the performance of companies within industries. The results of both sections are synthesized and finally the country performance is estimated. The evaluation is based on the data set resulting from a survey of companies from selected industries.

  14. Strangeness production as a function of centrality

    Energy Technology Data Exchange (ETDEWEB)

    Andersen, E. [University of Bergen, Department of Physics, N-5007 Bergen (Norway); Blaes, R.; Cherney, M.; de la Cruz, B.; Fernandez, C.; Garabatos, C.; Garzon, J.A.; Geist, W.M.; Greiner, D.E.; Gruhn, C.; Hafidouni, M.; Hrubec, J.; Jones, P.G.; Judd, E.G.; Kuipers, J.P.M.; Ladrem, M.; Ladron de Guevara, P.; Lovhoiden, G.; MacNaughton, J.; Mosquera, J.; Nathaniec, Z.; Nelson, J.M.; Neuhofer, G.; Perez de los Heros, C.; Plo, M.; Porth, P.; Powell, B.; Ramil, A.; Rohringer, H.; Sakrejda, I.; Thorsteinsen, T.F.; Traxler, J.; Voltolini, C.; Wozniak, K.; Yanez, A.; Zybert, R.; Douglas E. Greiner for the NA36 Collaboration

    1995-07-20

    A correction to the TPC efficiency calculations based on discriminator response data is shown to have an average effect of 20% on the absolute magnitude of the earlier results. Consistency between runs with the NA36 magnet in different polarities is demonstrated. Comparisons are made with NA35 S+Ag data. The absolute flux of {Lambda} particles is approximately a factor of two in disagreement between the two experiments. A dependence of the rapidity spectrum for lambda`s on centrality is demonstrated. {copyright} 1995 {ital American} {ital Institute} {ital of} {ital Physics}.

  15. Central Waste Complex (CWC) Waste Analysis Plan

    Energy Technology Data Exchange (ETDEWEB)

    ELLEFSON, M.D.

    1999-12-01

    The purpose of this waste analysis plan (WAP) is to document the waste acceptance process, sampling methodologies, analytical techniques, and overall processes that are undertaken for waste accepted for storage at the Central Waste Complex (CWC), which is located in the 200 West Area of the Hanford Facility, Richland, Washington. Because dangerous waste does not include the source, special nuclear, and by-product material components of mixed waste, radionuclides are not within the scope of this documentation. The information on radionuclides is provided only for general knowledge.

  16. The Central 3 kpc of NGC 5850

    CERN Document Server

    Bremer, M; Eckart, A; Zuther, J; Fischer, S; Valencias-S., M; Combes, F; Garcia-Burillo, S

    2013-01-01

    NGC 5850 is a nearby (z=0.0085) early type spiral galaxy classified as LINER. It is considered as a prototype double-barred system. Our optical Integral Field Spectroscopic (IFS) data of the central 21x19 arcsec^2 of NGC 5850 show extended LINER-like emission which we ascribe to the presence of a hot and evolved stellar population, possibly together with a faint AGN. Additionally NGC 5850 shows extended `composite' ionization patterns, likely to stem from a mixture of LINER-like ionization and photoionization by star formation. The kinematics of the gas deviates strongly from a simple rotational structure.

  17. Central Limit Theorem for Nonlinear Hawkes Processes

    CERN Document Server

    Zhu, Lingjiong

    2012-01-01

    Hawkes process is a self-exciting point process with clustering effect whose jump rate depends on its entire past history. It has wide applications in neuroscience, finance and many other fields. Linear Hawkes process has an immigration-birth representation and can be computed more or less explicitly. It has been extensively studied in the past and the limit theorems are well understood. On the contrary, nonlinear Hawkes process lacks the immigration-birth representation and is much harder to analyze. In this paper, we obtain a functional central limit theorem for nonlinear Hawkes process.

  18. Relativistic Newtonian Dynamics under a central force

    Science.gov (United States)

    Friedman, Yaakov

    2016-10-01

    Planck's formula and General Relativity indicate that potential energy influences spacetime. Using Einstein's Equivalence Principle and an extension of his Clock Hypothesis, an explicit description of this influence is derived. We present a new relativity model by incorporating the influence of the potential energy on spacetime in Newton's dynamics for motion under a central force. This model extends the model used by Friedman and Steiner (EPL, 113 (2016) 39001) to obtain the exact precession of Mercury without curving spacetime. We also present a solution of this model for a hydrogen-like atom, which explains the reason for a probabilistic description.

  19. An air quality model for Central Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Jazcilevich, D. Aron; Garcia, R. Agustin; Suarez, Gerardo Ruiz; Magana, R. Victor; Perez, L. Jose Luis [Universidad Nacional Autonoma de Mexico, Centro de Ciencias de la Atmosfera, Mexico City (Mexico); Fuentes-Gea, Vicente [Universidad Nacional Autonoma de Mexico, Div. de Estudios del Posgrado, Mexico City (Mexico)

    1999-07-01

    A computational air quality model for Central Mexico that includes the Basin of the Valley of Mexico, the Valleys of Toluca, Puebla and Cuernavaca already in experimental operation, is presented. The meteorology of the region is obtained combining two non-hydrostatic models: a model designed for synoptic scales called MM5 provides initial and boundary data to a model specially designed for urban environments and scales called MEMO. The transport model used numerical techniques developed by the authors that eliminate numerical diffusion and dispersion. For the photochemical model several ODE's integrators were tested. The emissions model developed uses the latest inventory data gathered in the region. (Author)

  20. Sources of Economic Fluctuations in Central America

    Directory of Open Access Journals (Sweden)

    Wilfredo Toledo

    2014-06-01

    Full Text Available Using panel data from Central America, this paper studies the determining factors of inflation and aggregate output fluctuations by estimating two Structural Vector Autoregressive (SVAR models. Price and output variables are included in one of the models, whereas M2 and the price of oil are additional variables in the other one. Findings of this study suggest that price is determined by the demand, while output seems to be influenced mainly by the supply shocks in that area. It was also evidenced that the price of oil does not have a significant impact on the general price level in that region.

  1. Improving Financial Services of China's Central Bank

    Institute of Scientific and Technical Information of China (English)

    Yang Wei

    2007-01-01

    @@ On August 29,Deputy Governor of People's Bank of China,Mr.Su Ning,held a press conference at State Council Information Office,and answered questions from media.The press conference mainly focused on the progress the central bank has made in improving financial services,which raised a lot of concern from public.At the conference,Mr. Su Ning fullv illustrated that China has achieved great progress in the recent years,and would perform better in future.

  2. Central extensions of Lax operator algebras

    Science.gov (United States)

    Schlichenmaier, M.; Sheinman, O. K.

    2008-08-01

    Lax operator algebras were introduced by Krichever and Sheinman as a further development of Krichever's theory of Lax operators on algebraic curves. These are almost-graded Lie algebras of current type. In this paper local cocycles and associated almost-graded central extensions of Lax operator algebras are classified. It is shown that in the case when the corresponding finite-dimensional Lie algebra is simple the two-cohomology space is one-dimensional. An important role is played by the action of the Lie algebra of meromorphic vector fields on the Lax operator algebra via suitable covariant derivatives.

  3. Central extensions of Lax operator algebras

    OpenAIRE

    Schlichenmaier, Martin; Sheinman, Oleg K.

    2007-01-01

    Lax operator algebras were introduced by Krichever and Sheinman as a further development of I.Krichever's theory of Lax operators on algebraic curves. These are almost-graded Lie algebras of current type. In this article local cocycles and associated almost-graded central extensions are classified. It is shown that in the case that the corresponding finite-dimensional Lie algebra is simple the two-cohomology space is one-dimensional. An important role is played by the action of the Lie algebr...

  4. Central Odontogenic Fibroma of the Mandible

    Directory of Open Access Journals (Sweden)

    Saeedeh Khajeh Ahmadi

    2013-01-01

    Full Text Available A 16-years-old female patient with painless swelling of the right side of mandible is described. She noticed the swelling from two years ago, without painful symptoms. Axial CT imaging showed buccal expansion with intact buccal and lingual cortical bone. The report of incisional biopsy was central odontogenic fibroma. Under general anesthesia the lesion was removed after ostectomy of buccal cortical plate and inferior alveolar nerve preserved. Three-year follow-up after tumor excision relieved no recurrence.

  5. Temperature of the Central Processing Unit

    Directory of Open Access Journals (Sweden)

    Ivan Lavrov

    2016-10-01

    Full Text Available Heat is inevitably generated in the semiconductors during operation. Cooling in a computer, and in its main part – the Central Processing Unit (CPU, is crucial, allowing the proper functioning without overheating, malfunctioning, and damage. In order to estimate the temperature as a function of time, it is important to solve the differential equations describing the heat flow and to understand how it depends on the physical properties of the system. This project aims to answer these questions by considering a simplified model of the CPU + heat sink. A similarity with the electrical circuit and certain methods from electrical circuit analysis are discussed.

  6. Las conflictivas fronteras de Asia Central

    OpenAIRE

    Stanganelli, Isabel Cecilia

    2002-01-01

    Si bien el gran juego político del siglo XIX definió la frontera entre Rusia y Afganistán mediante un tratado firmado por Rusia y el Reino Unido, la vasta región que hoy constituyen las cinco restantes repúblicas de Asia Central fue incorporada a Rusia zarista en sucesivas etapas y en el período soviético dotada por Moscú de límites con funciones puramente administrativas. La sorpresiva independencia de las repúblicas en diciembre de 1991 transformó a esos límites en internacionales. Lejos...

  7. GROWING MAGNETIC FIELDS IN CENTRAL COMPACT OBJECTS

    Directory of Open Access Journals (Sweden)

    C. G. Bernal

    2011-01-01

    Full Text Available Estudiamos el efecto de un modelo de crecimiento del campo magnético en los llamados Objetos Compactos Centrales (OCCs. Tal evolución del campo magnético no es una idea nueva (Blandford, Applegate, & Hernquist 1983 pero sus implicaciones evolutivas no han sido estudiadas completamente (Michel 1994. Discutimos las nuevas clases de estrellas de neutrones, las cuales se presentan en cinco tipos reconocidos en los últimos diez años. Comentamos la posibilidad de que un pulsar magnetizado, débilmente rotante, pueda haberse formado en SN1987A.

  8. Centrally active nonhormonal hot flash therapies.

    Science.gov (United States)

    Loprinzi, Charles L; Stearns, Vered; Barton, Debra

    2005-12-19

    Given the problems associated with hormonal therapy, and the prominent problem of hot flashes in menopausal women, there is a need for nonhormonal agents to alleviate hot flashes. Several compounds that appear to act on the central nervous system have been investigated. Potential mechanisms for their effects on hot flashes have been described. Bellergal (no longer available on the US market, where it was known as Bellergal-S), a combination preparation sedative that consists of low-dose phenobarbital, ergotamine tartrate, and levorotatory alkaloids of belladonna, is an old agent that was popular approximately 20 years ago; however, there is limited suggestion of efficacy for this agent. Clonidine, an older antihypertensive drug, is another centrally active agent that has been studied. Randomized trials have demonstrated that it clearly works for reducing hot flashes, but the magnitude of efficacy is somewhat limited. Toxicity from this agent limits its utility in the clinic. Methyldopa is another centrally active agent that has been studied but to a more limited degree. It appears to have minimal efficacy and too much toxicity to make it clinically useful. Anecdotal observations from a number of sources suggested that newer antidepressants can alleviate hot flashes. This led to pilot trials of venlafaxine and paroxetine, with results suggesting benefit from both drugs. Subsequently, randomized, placebo-controlled, double-blind clinical trials of venlafaxine, paroxetine, and fluoxetine were conducted. All 3 of these clinical trials demonstrated statistically significant reductions in hot flashes with these newer antidepressants compared with placebo. Pilot trials of citalopram and mirtazapine, 2 other newer antidepressants, have also suggested efficacy. Toxicity evaluations have suggested that these agents are, again, well tolerated by the majority of patients. A recent trial, however, was unable to demonstrate any benefit for fluoxetine or citalopram over a placebo

  9. Central pontine myelinolysis after liver transplantation.

    Science.gov (United States)

    Estol, C J; Faris, A A; Martinez, A J; Ahdab-Barmada, M

    1989-04-01

    Eight adults and 3 children out of 85 patients who had neuropathologic examination after death following orthotopic liver transplantation showed central pontine myelinolysis (CPM). Four patients also had extrapontine myelinolysis. Eight patients had significant serum sodium changes. In 5, the fluctuation occurred perioperatively and 4 had a clinical picture consistent with CPM, although no patient had this as an antemortem diagnosis. We emphasize the role of hepatic dysfunction as a cause of CPM and recommend careful monitoring of electrolytes in the perioperative period of patients undergoing liver transplantation.

  10. Internationalisation in Central and Eastern Europe

    DEFF Research Database (Denmark)

    Marinov, Marin Alexandrov

    This is a unique volume among the existing variety of publications on foreign direct investment (FDI) in Central and Eastern Europe (CEE) because it focuses on the internationalization process taking place there. It addresses the rapid changes of the business climate in the region that have led...... to intensive internationalization of companies, businesses and national economies. Existing FDI books have mostly taken the perspective of attracting inward FDI flows, missing the aspect of FDI outflows from CEE countries. While foreign investors face the specific context of a region that poses new...

  11. Pathology of the Trachea and Central Bronchi.

    Science.gov (United States)

    Shroff, Girish S; Ocazionez, Daniel; Vargas, Daniel; Carter, Brett W; Wu, Carol C; Nachiappan, Arun C; Gupta, Pushpender; Restrepo, Carlos S

    2016-06-01

    A wide variety of disorders can affect the trachea and central bronchi. Computed tomography is the imaging modality of choice in the evaluation of tracheobronchial disease. Tracheobronchial abnormalities are sometimes incidentally detected on routine imaging or when imaging is performed for another reason. Abnormalities of the tracheobronchial tree, however, can be easily missed because they can be subtle. Furthermore, because symptoms in patients with tracheobronchial disorders often overlap symptoms of lung disease, radiologists may focus their attention on the lungs and overlook the tracheobronchial tree. In this article, we review a wide range of tracheobronchial diseases with emphasis on their computed tomographic appearances.

  12. PLASTICITY IN THE ADULT CENTRAL AUDITORY SYSTEM.

    Science.gov (United States)

    Irvine, Dexter R F; Fallon, James B; Kamke, Marc R

    2006-04-01

    The central auditory system retains into adulthood a remarkable capacity for plastic changes in the response characteristics of single neurons and the functional organization of groups of neurons. The most dramatic examples of this plasticity are provided by changes in frequency selectivity and organization as a consequence of either partial hearing loss or procedures that alter the significance of particular frequencies for the organism. Changes in temporal resolution are also seen as a consequence of altered experience. These forms of plasticity are likely to contribute to the improvements exhibited by cochlear implant users in the post-implantation period.

  13. PLASTICITY IN THE ADULT CENTRAL AUDITORY SYSTEM

    Science.gov (United States)

    Irvine, Dexter R. F.; Fallon, James B.; Kamke, Marc R.

    2007-01-01

    The central auditory system retains into adulthood a remarkable capacity for plastic changes in the response characteristics of single neurons and the functional organization of groups of neurons. The most dramatic examples of this plasticity are provided by changes in frequency selectivity and organization as a consequence of either partial hearing loss or procedures that alter the significance of particular frequencies for the organism. Changes in temporal resolution are also seen as a consequence of altered experience. These forms of plasticity are likely to contribute to the improvements exhibited by cochlear implant users in the post-implantation period. PMID:17572797

  14. Colloquium on Central Asia; Colloque sur l'Asie centrale

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2005-07-01

    This colloquium on Azerbaijan was organized by the direction of international relations of the French Senate and the French center of foreign trade (CFCE). This document gathers the interventions of the participants and the debates with the audience following these interventions. The topics treated concern: - the present day political-economical situation of Central Asia countries (problem of borders, relations with Russia and China); - the economies of Central Asia countries: short term problems and medium-term perspectives; - the relations with the European Union (political, economical, trade and investments, perspectives); - the European energy stakes of Caspian sea (oil and gas reserves, development of hydrocarbon resources, exploitation and transport constraints, stakes for Europe and France); - TotalFinaElf company in Central Asia (Kazakhstan, Azerbaijan, enclavement problem); - the economical impacts of the TRACECA pathway (Transport Corridor Europe Caucasus Asia). (J.S.)

  15. Involvement of central alpha1-adrenoceptors on renal responses to central moxonidine and alpha-methylnoradrenaline.

    Science.gov (United States)

    de Andrade, Carina A F; de Andrade, Glaucia M F; De Paula, Patricia M; De Luca, Laurival A; Menani, José V

    2009-04-01

    Moxonidine (alpha2-adrenoceptor/imidazoline receptor agonist) injected into the lateral ventricle induces diuresis, natriuresis and renal vasodilation. Moxonidine-induced diuresis and natriuresis depend on central imidazoline receptors, while central alpha1-adrenoceptors are involved in renal vasodilation. However, the involvement of central alpha1-adrenoceptors on diuresis and natriuresis to central moxonidine was not investigated yet. In the present study, the effects of moxonidine, alpha-methylnoradrenaline (alpha2-adrenoceptor agonist) or phenylephrine (alpha1-adrenoceptor agonist) alone or combined with previous injections of prazosin (alpha1-adrenoceptor antagonist), yohimbine or RX 821002 (alpha2-adrenoceptor antagonists) intracerebroventricularly (i.c.v.) on urinary sodium, potassium and volume were investigated. Male Holtzman rats (n = 5-18/group) with stainless steel cannula implanted into the lateral ventricle and submitted to gastric water load (10% of body weight) were used. Injections of moxonidine (20 nmol) or alpha-methylnoradrenaline (80 nmol) i.c.v. induced natriuresis (196 +/- 25 and 171 +/- 30, respectively, vs. vehicle: 101 +/- 9 microEq/2 h) and diuresis (9.0 +/- 0.4 and 12.3 +/- 1.6, respectively, vs. vehicle: 5.2 +/- 0.5 ml/2 h). Pre-treatment with prazosin (320 nmol) i.c.v. abolished the natriuresis (23 +/- 4 and 76 +/- 11 microEq/2 h, respectively) and diuresis (5 +/- 1 and 7.6 +/- 0.8 ml/2 h, respectively) produced by i.c.v. moxonidine or alpha-methylnoradrenaline. RX 821002 (320 nmol) i.c.v. abolished the natriuretic effect of alpha-methylnoradrenaline, however, yohimbine (320 nmol) did not change renal responses to moxonidine. Phenylephrine (80 nmol) i.c.v. induced natriuresis and kaliuresis that were blocked by prazosin. Therefore, the present data suggest that moxonidine and alpha-methylnoradrenaline acting on central imidazoline receptors and alpha2-adrenoceptors, respectively, activate central alpha1-adrenergic mechanisms to

  16. Can the European Central Bank Create a European identity?

    DEFF Research Database (Denmark)

    Ravn Sørensen, Anders

    2014-01-01

    In what ways do central banks construct community, and how may the European Central Bank (ECB) contribute to a supranational European identity? In this paper I seek to answer these two questions by developing a conceptual framework for the ways that central banks construct national identities and...

  17. Undetermination of the relation between network synchronizability and betweenness centrality

    Institute of Scientific and Technical Information of China (English)

    Wang Sheng-Jun; Wu Zhi-Xi; Dong Hai-Bong; Chen Guan-Rung

    2011-01-01

    Betweenness centrality is taken as a sensible indicator of the synchronizability of complex networks. To test whether betweenness centrality is a proper measure of the synchronizability in specific realizations of random networks, this paper adds edges to the networks and then evaluates the changes of betweenness centrality and network synchronizability. It finds that the two quantities vary independently.

  18. The Exponent Set of Central Symmetric Primitive Matrices

    Institute of Scientific and Technical Information of China (English)

    陈佘喜; 胡亚辉

    2004-01-01

    This paper first establishes a distance inequality of the associated diagraph of a central symmetric primitive matrix, then characters the exponent set of central symmetric primitive matrices, and proves that the exponent set of central symmetric primitive matrices of order n is {1, 2,… ,n-1}. There is no gap in it.

  19. Some properties of the central heavy ion collisions

    CERN Document Server

    Wazir, Z; Khan, E U; Haseeb, Mahnaz Q; Ajaz, M; Khan, K H

    2009-01-01

    Some experimental results are discussed in connection with the properties of the central heavy ion collisions. These experiments indicate the regime changes and saturation at some values of the centrality. This phenomenon is considered to be a signal of the percolation cluster formation in heavy ion collisions at high energies. Keywords: heavy ion collisions, theoretical models, centrality, phase transition.

  20. Regulatory Regionalism and Education: The European Union in Central Asia

    Science.gov (United States)

    Jones, Peter

    2010-01-01

    This paper investigates the purchase which Jayasuriya's regulatory regionalism approach offers for an analysis of the European Union's engagement in Central Asia. The European Union has a clearly articulated strategy through which to pursue what it sees as its interests in Central Asia and the development of a range of EU-Central Asia education…