WorldWideScience

Sample records for fmdig anwendung neuronaler

  1. neuronales artificiales

    Directory of Open Access Journals (Sweden)

    Bartolomé Drozdowicz

    2005-01-01

    Full Text Available La segmentación de Imágenes de Resonancia Magnética (IRM es su descomposición en unidades naturales, tejidos normales (sustancia gris, sustancia blanca, fluido cerebro espinal, etc. y posibles tejidos patológicos (tumores, edema, etc. Las IRM son una herramienta de diagnóstico estándar, y, a diferencia de los otros métodos de estudios por imagen (TAC, PET, etc., tienen características multidimensionales, ya que existen diferentes modalidades para generar las imágenes (T1, T2, DP, que son utilizadas para conformar los patrones empleados durante el entrenamiento y el testeo de las redes. La segmentación es particularmente importante en aplicaciones como: extracción de características anatómicas, medición volumétrica, visualización 3D, compresión de datos, planeamiento de radioterapia y planeamiento de cirugía. El objetivo de la investigación cuyos resultados se exponen fue explorar el potencial de diferentes estructuras de redes neuronales para realizar la segmentación de IRM del cerebro y analizar los diferentes procesos de preprocesamiento de datos, necesarios para obtener la mayor eficiencia de las redes.

  2. Data mining utilizando redes neuronales

    OpenAIRE

    Ale, Juan María; Bot, Romina Laura

    2004-01-01

    Las Redes Neuronales son ampliamente utilizadas para tareas relacionadas con reconocimiento de patrones y clasificación. Aunque son clasificadores muy precisos, no son comúnmente utilizadas para Data Mining porque producen modelos de aprendizaje inexplicables. El algoritmo TREPAN extrae hipótesis explicables de una Red Neuronal entrenada. Las hipótesis producidas por el algoritmo se representan con un árbol de decisión que aproxima a la red. Los árboles de decisión extraídos por TREPAN no pue...

  3. Controladores neuronales en robótica evolutiva

    OpenAIRE

    Fernández León, José A.; Acosta, Gerardo

    2004-01-01

    Este trabajo consiste en el estudio de las características más relevantes de la metodología denominada Robótica Evolutiva, en cuanto a la construcción de controladores neuronales evolutivos genéticamente determinados. Dichos controladores son aplicados a un robot tipo Khepera para llevar a cabo tareas (por ejemplo: planificación de trayectorias en navegación de robots) dentro de un entrono no conocido previamente. Los controladores propuestos están basados en controladores neuronales de tiemp...

  4. Physiological and technical limitations of functional magnetic resonance imaging (fMRI) - consequences for clinical use; Physiologische und technische Grenzen der funktionellen Magnetresonanztomographie und die damit verbundenen Konsequenzen fuer die klinische Anwendung

    Energy Technology Data Exchange (ETDEWEB)

    Wuestenberg, T. [Neurologische Klinik der Charite, Humboldt-Universitaet Berlin (Germany); Neurologische Klinik der Charite, Humboldt-Universitaet Berlin, Schumannstrasse 20/21, 10117, Berlin (Germany); Jordan, K. [Institut fuer Psychologie II, Otto-von-Guericke-Universitaet Magdeburg (Germany); Giesel, F.L. [Abteilung fuer onkologische Diagnostik und Therapie, Deutsches Krebsforschungszentrum Heidelberg (Germany); Villringer, A. [Neurologische Klinik der Charite, Humboldt-Universitaet Berlin (Germany)

    2003-07-01

    Functional magnetic resonance imaging (fMRI) is the most common noninvasive technique in functional neuroanatomy. The capabilities and limitations of the method will be discussed based on a short review of the current knowledge about the neurovascular relationship. The focus of this article is on current methodical and technical problems regarding fMRI-based detection and localization of neuronal activity. Main error sources and their influence on the reliability and validity of fMRI-methods are presented. Appropriate solution strategies will be proposed and evaluated. Finally, the clinical relevance of MR-based diagnostic methods are discussed. (orig.) [German] Die funktionelle Magnetresonanztomographie (fMRT) ist eines der wichtigsten Verfahren der funktionellen Neuroanatomie. Aufbauend auf einer kurzen Darstellung des aktuellen Wissensstands bzgl. des Zusammenhangs zwischen lokaler neuronaler Aktivitaet und haemodynamischer Reaktion werden ausgewaehlte Moeglichkeiten und Grenzen des Verfahrens fuer die klinische Anwendung diskutiert. Der Schwerpunkt liegt dabei auf der Darstellung der derzeitigen methodischen und technischen Einschraenkungen hinsichtlich einer fMRT-basierten Detektion und Lokalisierung neuronaler Aktivitaet. Es werden die Hauptfehlerquellen und ihre Auswirkungen auf die Reliabilitaet und Validitaet des Verfahrens erlaeutert und aktuelle Loesungsansaetze diskutiert. Abschliessend erfolgt eine Bewertung der aktuellen klinischen Relevanz funktioneller MR-Diagnosemethoden. (orig.)

  5. Klare Regeln - effiziente und effektive FMEA-Anwendung

    OpenAIRE

    Schloske, Alexander

    2014-01-01

    Der Vortrag beschreibt klare Regeln zur effizienten und effektiven FMEA-Anwendung. - Denkmodelle für die verschiedenen FMEA-Arten (System-FMEA, Konstruktions-FMEA, Prozess-FMEA) - Anwendungsbereiche und FMEA-Planung - Strukturierung von FMEAs - Funktionen, Produktmerkmale und Prozessmerkmale - Risikoanalyse - Maßnahmendefinition - Risikobewertung - Präsentation von FMEAs - FMEA als "lebendes Dokument".

  6. CODIFICACIÓN DE ESTADOS FUNCIONALES EN REDES NEURONALES BIOLÓGICAS

    OpenAIRE

    Luis Carrillo-Reid; José Barga

    2008-01-01

    Un tema central para las neurociencias consiste en descifrar la forma en la cual las redes neuronales biológicas procesan la información y guardan memorias. En 1949 Donald Hebb propuso que la actividad reverberante de pequeños circuitos neuronales llamados "ensambles" funcionaría como el sustrato sobre el cual se construyen las rutas de la memoria. Sin embargo, para poder almacenar cualquier tipo de información compleja, los ensambles neuronales deberían tener la habilidad de organizarse en j...

  7. Aplicación de las Redes Neuronales en Medicina

    Directory of Open Access Journals (Sweden)

    Alberto Delgado

    1999-10-01

    Full Text Available Las redes neuronales artificiales son modelos matemáticos que pueden ser entrenados para aprender relaciones no lineales entre un conjunto de datos de entrada y un conjunto de datos de salida. En medicina la aplicación más común de estos modelos, es la clasificación de patrones con el propósito de apoyar al médico en el diagnóstico y tratamiento del paciente.

  8. Técnicas de reconocimiento facial mediante redes neuronales

    OpenAIRE

    Cabello Pardos, Enrique

    2011-01-01

    En esta Tesis se exploran soluciones a la verificación facial. Se han estudiado técnicas basadas en imágenes bidimensionales y se ha realizado un estudio inicial basado en un modelo tridimensional de la cara. Se han comparado tres clasificadores (k vecinos más cercanos, redes neuronales del tipo ñmciones de base radial y máquinas de vector soporte), mostrando los resultados obtenidos con los diferentes datos de entrada. En dos dimensiones se han propuesto dos técnicas de reducción de...

  9. Reconocimiento de imágenes utilizando redes neuronales artificiales

    OpenAIRE

    García García, Pedro Pablo

    2013-01-01

    Este trabajo describe el proceso de extracción de patrones característicos de imágenes,mediante la ayuda de Redes Neuronales Artificiales. La información de la Red Neuronal junto con datos adicionales de las imágenes, serán almacenados en una base de datos y consumidos por un servicio web. Un teléfono móvil con sistema operativo Android consumirá la información almacenada en el servicio web. Posteriormente al realizar una captura de imagen con la cámara del teléfono, este procesará la imag...

  10. Aplicaciones sobre plataformas de redes neuronales en tiempo real

    OpenAIRE

    Tosini, Marcelo Alejandro; Acosta, Nelson

    2003-01-01

    El presente trabajo pretende el diseño de una metodología para la construcción de aplicaciones basadas en redes neuronales sobre una plataforma Muren. Las aplicaciones se restringen a sistemas de control y reconocimiento de patrones por imágenes. Se describe la arquitectura del sistema de desarrollo Muren, basado en 2 procesadores ZISC de 78 neuronas cada uno, una FPGA Spartan II, bancos de memoria y lógica adicional de comunicación.

  11. Aplicaciones de redes neuronales en economía.

    Directory of Open Access Journals (Sweden)

    Pacheco Bonrostro, J.

    1997-01-01

    Full Text Available La metodología de las Redes Neuronales Artificiales, está siendo usada con profusión, dentro del campo de la Economía, hasta tal punto que existe una publicación bimensual, que trata específicamente estas aplicaciones a los mercados financieros: Neurove$t Journal. En este trabajo, se presentan las principales líneas de investigación existentes, a continuación la que nosotros estamos siguiendo, con algunos resultados iniciales, para finalizar con las líneas a seguir y una selección bibliográfica.

  12. Using neuronal nets for modelling and control of internal combustion engines; Der Einsatz neuronaler Netze zur Modellierung, Steuerung und Regelung von Verbrennungsmotoren

    Energy Technology Data Exchange (ETDEWEB)

    Isermann, R.; Hafner, M.; Mueller, N.; Schueler, M. [Technische Univ. Darmstadt (Germany). Inst. fuer Regelungstechnik

    1999-07-01

    Design and testing of digital electronic control systems necessitate relatively accurate mathematical models of the static and dynamic characteristics of internal combustion engines. Control variables are injection volume, injection angle, ignition point and several others, which means a large number of characteristic fields and long measuring times in engine test stands. Neuronal nets enable a more compact description than characteristic field grids and are also more easily adaptable in test stand measurements. The contribution describes a particularly favourable local linear radial basis function net (LOLIMOT) and shows how it can be used for modelling the steady-state and dynamic exhaust characteristics of a diesel engine and the dynamic characteristics of an exhaust turbocharger. It also shows how combustion chamber control with adaptive control of the ignition pooint can be designed for a spark ignition engine with the aid of a neuronal net. [German] Entwurf und Test von digitalelektronischen Steuerungen und Regelungen erfordern in zunehmendem Masse relativ genaue mathematische Modelle fuer das statische und dynamische Gesamtverhalten von Verbrennungsmotoren. Ausser den Stellgroessen Einspritzmenge, Einspritzwinkel und Zuendzeitpunkt kommen noch weitere Stellgroessen hinzu. Die Zahl der in modernen Motorsteuerungen zu realisierenden Kennfelder steigt deshalb sehr stark an und damit auch die erforderliche Messzeit an Motorenpruefstaenden. Kuenstliche neuronale Netze bieten nun die Moeglichkeit, mehrdimensionale Kennfelder wesentlich kompakter zu beschreiben als Rasterkennfelder. Sie erlauben ausserdem eine wesentlich bessere Adaption bei Pruefstandsversuchen. Im Beitrag wird ein besonders geeignetes lokal lineares Radial-Basis-Funktions-Netz (LOLIMOT) beschrieben und dessen Anwendung gezeigt zur Modellierung des stationaeren und dynamischen Abgasverhaltens eines Dieselmotors und des dynamischen Verhaltens eines Abgas-Turboladers. Dann wird gezeigt, wie man eine

  13. Reconocimiento automático del habla con redes neuronales artificiales

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    Diego H. Milone

    2005-01-01

    Full Text Available En la última década se han investigado intensamente los fundamentos y aplicaciones de las redes neuronales artificiales y se ha invertido un gran esfuerzo en el área del reconocimiento automático del habla. Este trabajo presenta una extensa revisión y un análisis crítico de la aplicación de redes neuronales artificiales al reconocimiento automático del habla. Se mencionan los antecedentes de la década de los 80 y se describen los trabajos que constituyen una aplicación directa de técnicas clásicas de redes neuronales artificiales. Se discuten aquellos en los que se han desarrollado nuevas arquitecturas neuronales, orientadas a resolver el problema del reconocimiento automático del habla, y se presentan también numerosos trabajos que consisten en la combinación de redes neuronales artificiales y modelos ocultos de Markov. Finalmente se realiza un análisis comparativo de los diferentes enfoques y los puntos clave que guían las investigaciones en torno a nuevos paradigmas sobre este problema. ´

  14. Entwicklung und Anwendung neuer NMR-Methoden: Orientierungsmedien zur Strukturbestimmung mit anisotropen Parametern und Metabonomics

    OpenAIRE

    Büchler, Silke

    2014-01-01

    Das Ziel dieser Arbeit war die Entwicklung und Anwendung neuer Orientierungsmedien zur Strukturbestimmung mit anisotropen Parametern, sowie die Etablierung von Metabonomics-Studien an Flüssigzellkulturen und Reispflanzen.

  15. Un nuevo enfoque para la resolución de problemas: redes neuronales

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    Jonatán Gómez Perdomo

    2015-05-01

    Full Text Available RESUMEN El siguiente artículo  expone los lineamientos generales de un nuevo enfoque para la resolución de problemas mediante computador. Inspiradas en las redes neuronales biológicas, las redes neuronales artifíciales han  mostrado mayor efectividad para resolver problemas que los enfoques tradicionales no han  solucionado o lo han hecho de manera parcial. En la actualidad este enfoque ha ganado un gran auge, lo cual ha generado en el país grupos de investigación que están trabajando sobre sí mismo. Como parte de su trabajo  en el grupo de la Universidad Nacional, los autores desarrollan una herramienta para el diseño, entrenamiento y simulación de redes neuronales artificiales. Las características generales de esta herramienta  se exponen al final.

  16. KRISENZUSTÄNDE UND ANWENDUNG VON ZWANGSMASSNAHMEN IN DER PSYCHIATRIE

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    Vesna Šendula Jengić

    2017-01-01

    Full Text Available In der Arbeit wird über die Phänomene der Aggressivität und Gewalt bei Menschen diskutiert, wobei man besonderen Wert auf die Personen mit seelischen Störungen legt. Krisenzustände und Gewaltverhalten gibt es nicht nur in der Psychiatrie. Es kann immer zu einem solchem Zustand und Verhalten kommen und jeder kann unter bestimmten Umständen sowohl Opfer als auch Täter sein. Multikausalität und Komplexität sowie auch individuelle Umstände und situationsbezogene Faktoren, welche zum Gewaltverhalten führen können, haben nur geringen Prognosekraft. Statistische Indikatoren andererseits können falsch positive und falsch negative Ergebnisse verbergen, wobei ein Fehler in der Einschätzung das Risiko zum Erscheinen eines Verhaltens drastisch erhöhen oder zum unrechtfertigten Entziehung der Freiheit führen kann. Zwangsmaβnahmen in der Psychiatrie sind nur ausnahmsweise anzuwenden, und zwar, wenn ein gefährliches Verhalten direkt das Leben und die Gesundheit einer Person oder einer Umgebung gefährdet. Darüber hinaus ist die Dauer von Zwangsmaβnahmen auch beschränkt. Die Gesetzesregulative, insbesondere das Gesetz über den Schutz von Personen mit seelischen Störungen (Amtsblatt der Republik Kroatien Nr. 76/2014 und die Ordnung über die Arten und die Weise der Anwendung von Zwangsmaβnahmen gegenüber den Personen mit schwierigen seelischen Störungen (Amtsblatt der Republik Kroatien Nr. 16/2015, dient als zusätzlicher Schutz der Rechte dieser Patientengruppe und schreibt die Arten und die Weise der Anwendung von Zwangsmaβnahmen sowie auch die Vorgehensweise. Zusätzliche Richtlinien und Vorgehensstrategien wurden auch von den Gesellschaften für Psychiatrie gegeben. In der Arbeit wird betont, dass bessere Bedingungen, Infrastruktur und Arbeitskräfte sowie auch ständige Entwicklung und Bewertung der Arbeitsqualität in der Psychiatrie erforderlich sind. Abschlieβend werden Standards und ethische Fragen in Betracht gezogen, wie

  17. SISTEMA PARA EL ENTRENAMIENTO PARALELO DE REDES NEURONALES DE PROPAGACIÓN HACIA ATRÁS

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    Alejandro Rosete Suárez

    2006-04-01

    Full Text Available

    El objetivo principal de este trabajo es la exploración del uso de la programación paralela en la instrumentación de redes neuronales, específicamente este artículo trata del uso de tal procesamiento para acelerar la fase de entrenamiento de una red de propagación hacia atrás (BPN. Se describe la implementación y los resultados obtenidos con la red neuronal antes mencionada. El sistema está realizado de manera tal, que el usuario pueda ejecutarlo eficientemente con un amplio rango de aplicaciones neuronales. Para probar el algoritmo paralelo implementado se utilizó una aplicación neuronal real y los resultados obtenidos muestran lo beneficioso de usar el entrenamiento paralelo.

  18. Empleo de redes neuronales artificiales en redes de distribución eléctrica

    OpenAIRE

    Alexander Cabrera; Delmar Jaime; Dante Miraglia; Sergio de la Fé Dotres

    2011-01-01

    En el trabajo se muestran las experiencias alcanzadas  en la aplicación de las Redes Neuronales Artificiales para resolver problemas tales como  la predicción de carga y de pérdidas de energía en las líneas y la localización de zonas en falla en circuitos de distribución de la ciudad de Santiago de Cuba.

  19. CODIFICACIÓN DE ESTADOS FUNCIONALES EN REDES NEURONALES BIOLÓGICAS

    Directory of Open Access Journals (Sweden)

    Luis Carrillo-Reid

    2008-01-01

    Full Text Available Un tema central para las neurociencias consiste en descifrar la forma en la cual las redes neuronales biológicas procesan la información y guardan memorias. En 1949 Donald Hebb propuso que la actividad reverberante de pequeños circuitos neuronales llamados "ensambles" funcionaría como el sustrato sobre el cual se construyen las rutas de la memoria. Sin embargo, para poder almacenar cualquier tipo de información compleja, los ensambles neuronales deberían tener la habilidad de organizarse en jerarquías, es decir, pequeñas subrutinas que componen procedimientos más elaborados. Nuestros experimentos muestran que los circuitos con estas capacidades pueden encontrarse en pequeños pedazos de cerebro aislado in vitro y estudiarse con detalle. De esta manera, el cerebro como cualquier sistema puede ser entendido y estudiado de acuerdo con sus elementos básicos y sus reglas de composición; permitiéndonos entender desde la forma en la cual nos comunicamos hasta los hábitos que determinan nuestra vida cotidiana. Los hallazgos experimentales aquí descritos podrían sentar las bases para entender tanto los estados cerebrales normales como los patológicos, con lo cual será posible proponer soluciones para distintas enfermedades neurodegenerativas que tienen un gran impacto en la sociedad.

  20. IFRS 8 OPERATING SEGMENTS: Eine Untersuchung der erstmaligen Anwendung in der Schweiz

    OpenAIRE

    Meyer, C; Weiss, S

    2010-01-01

    Seit dem 1. Januar 2009 sind kotierte IFRS-Anwender verpflichtet, eine Segmentberichterstattung nach IFRS 8 zu erstellen. Anhand einer Analyse der Geschäftsberichte 2009 der an der SIX Swiss Exchange kotierten Unternehmen soll ein Überblick über die erstmalige Anwendung von IFRS 8 "Operating Segments" in der Schweiz gewonnen werden.

  1. Subpoblaciones neuronales presentes en el ganglio de la raíz dorsal

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    Marlén Martínez

    2000-09-01

    Full Text Available La función principal de las neuronas del ganglio de la raiz dorsal (GRD es transmitir la información sensorial desde la periferia hasta el sistema nervioso central. Dos clases de células están presentes en el ganglio: las células no neuronales y las neuronales. La heterogeneidad morfológica, fisiológica y bioquimica de la población neuronal permite diferenciarla en subpoblaciones. Morfológicarnente, se distinguen tres tipos neuronales (A, B y C segun el tamaño y las caracteristicas ultraestructurales. Fisiológicamente, hay una relación directa entre el tamaño, el diámetro de las fibras nerviosas y la velocidad con que conducen el impulso nervioso. Finalmente, el uso de marcadores (neuropéptidos, enzimas, receptores, etc. permite realizar una clasificación bioquímica, que es la más utilizada para estudiar la función neuronal. Este articulo revisa la evidencia experimental sobre el tema de la heterogeneidad neuronal del GRD v wresenta una correlación desde el punto de vista bioauimico v fisioló-o ico en los casos en dondé'hay información disponible. El esiudio de subpoblaciones en este ganglio resulta de bastante interés para investigaciones en neurociencias, principalmente en infecciones por virus neurotrópicos, traurnatismos del nervio periférico y el estudio de factores neurotróficos, entre otros.

  2. Redes neuronales en espectrometría y dosimetría de neutrones

    OpenAIRE

    Torre López, Jesús Alberto de la

    2017-01-01

    Este Trabajo de Fin de Grado tiene como objetivo fundamental la realización de experimentos y simulaciones que ayuden a la comprensión acerca de una de las herramientas de predicción de valores más potentes de la inteligencia artificial como son las Redes Neuronales Artificiales. Su aplicación en este trabajo será muy concreta, en el campo de la espectrometría y dosimetría de neutrones, sin embargo, sus posibles aplicaciones abarcan un campo mucho más amplio, lo cual hace de ellas una herr...

  3. Predicción de la demanda eléctrica horaria mediante redes neuronales artificiales.

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    Mallo González, Carlos

    2004-01-01

    Full Text Available En este trabajo se realiza una introducción a los modelos neuronales y se explora su aplicabilidad en el terreno de la economía cuantitativa como instrumento de modelización y predicción no paramétrica. A tal objeto hemos desarrollado un modelo de Red Neuronal Artificial que posteriormente aplicaríamos en la predicción de la demanda horaria de energía eléctrica con datos reales. Los resultados así obtenidos con los ofrecidos por las metodologías convencionales de ajuste y predicción

  4. Discriminación entre strain y temperatura en un sistema BOTDA mediante redes neuronales artificiales

    OpenAIRE

    Ruiz Lombera, Rubén; Piccolo, Arianna; Fuentes Cayón, Alberto; López Higuera, José Miguel; Mirapeix Serrano, Jesús María

    2017-01-01

    RESUMEN: En este artículo se propone el uso de un enfoque basado en inteligencia artificial, en particular en redes neuronales artificiales, para conseguir una discriminación automática en medidas de strain y temperatura en sistemas sensores distribuidos basados en la dispersión estimulada de Brillouin en fibra óptica, en particular en implementaciones BOTDA. ABSTRACT: We present in this paper the employment of artificial intelligence, in particular artificial neural networks, as a possibl...

  5. Herramientas modernas en redes neuronales: la librería Keras

    OpenAIRE

    Antona Cortés, Carlos

    2017-01-01

    El mundo de las redes neuronales está en auge. Poder simular el cerebro humano en un ordenador, parece ser uno de los hitos más prometedores de la informática. Es cierto que este hito todavía no se ha conseguido, pero mediante algoritmos de machine learning, ya es posible entrenar máquinas para que aprendan de forma parecida a como lo hará nuestro cerebro. El objetivo de este Trabajo de Fin de Grado es poner en práctica estos algoritmos utilizando la librería Keras. En primer lugar, se har...

  6. Hydrogen in motor car engineering. Production, storage, uses; Wasserstoff in der Fahrzeugtechnik. Erzeugung, Speicherung, Anwendung

    Energy Technology Data Exchange (ETDEWEB)

    Eichlseder, H.; Klell, M.

    2008-07-01

    The book presents a general outline of the various aspects of properties, production, storage and application of hydrogen at university level. The focus is on the thermodynamic aspects of hydrogen storage andon its applications in transportation and power supply. In particular, car engines and fuel cells are gone into, and the state of the art is outlined with reference to research projects of TU Graz university and HyCentA. Apart from the technical aspects, also the history and possible future trends are presented. [German] Dieses Buch bietet einen allgemeinen Ueberblick ueber die verschiedenen Aspekte von Eigenschaften, Erzeugung, Speicherung und Anwendung von Wasserstoff auf Hochschulniveau. Schwerpunkte liegen auf der Thermodynamik der Speicherung von Wasserstoff sowie auf der Anwendung in der Verkehrstechnik und in der Energietechnik. Speziell wird die Anwendung in der Verbrennungskraftmaschine und in der Brennstoffzelle behandelt, wobei mit Bezug auf Forschungsvorhaben an der TU Graz und dem HyCentA der aktuelle Stand der Technik fundiert dargestellt wird. Neben einer technischen Vertiefung werden auch die geschichtliche und die moegliche kuenftige Entwicklung angesprochen.

  7. Uso de redes neuronales para optimizar simulaciones en un modelo de flujo de pasajeros en aeropuertos

    Directory of Open Access Journals (Sweden)

    Joaquin Pacheco

    2002-01-01

    Full Text Available Uno de nuestros principales objetivos es el diseño de métodos de aprendizaje de redes neuronales que sean rápidos a la vez que den buenas soluciones o vectores de pesos. Una de las aplicaciones donde se necesita un método rápido (on-line de aprendizaje de las redes neuronales es en la optimización de simulaciones. En este informe se proponen un sencillo algoritmo de búsqueda local para optimizar simulaciones, con una aplicación a un interesante modelo de flujo de pasajeros en un aeropuerto. En este problema se contemplan la minimización del tiempo de recorrido de los pasajeros con una adecuada distribución de los recursos. Este método incorpora el uso de una red neuronal para acelerar la optimización. Se va a comparar el efecto del uso de los pesos obtenidos por diferentes métodos de aprendizaje de la red neuronal, propuestos recientemente para este fin.

  8. LAS REDES NEURONALES Y LA EVALUACIÓN DEL RIESGO DE CRÉDITO

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    Fredy Ocaris Pérez Ramírez

    2007-01-01

    Full Text Available A pesar del escepticismo del mundo académico sobre los avances de la inteligencia artificial, las redes neuronales han abierto un campo de exploración bursátil que aún tiene mucho por investigar. Atendiendo a las ventajas del uso de las redes neuronales artificiales (ANN, por sus siglas en inglés y a su capacidad para estimar modelos no lineales, en este artículo se muestra la aplicación de las redes neuronales a la cuantificación del riesgo de crédito. Además, se hace el desarrollo teórico de los fundamentos básicos de las redes neuronales. Para presentar las metodologías de medición de riesgo de crédito basados en redes neuronales, y aplicarlas a la base de datos de una cartera comercial, fue necesario elaborar un análisis exploratorio de cada una de las variables e investigar la correlación entre ellas. El objetivo del análisis es encontrar algunas relaciones para grupos determinados de la población, de acuerdo con sus características particulares. Por tanto, se cruzan variables de cada cliente, del crédito y del comportamiento contra la variable default (fallidos y no fallidos. Variable que establece un procedimiento de clasificación, y permite determinar las ponderaciones necesarias y, además, establece la probabilidad de fallido.In spite of the skepticism of the academic world on the advances of artificial intelligence, the neuronal networks have opened up a field of stock-exchange exploration that has still so much to research. Upon expounding the advantages of the usage of artificial neuronal network (ANN and its capacity to estimate nonlinear models this article shows the application of the neuronal networks on the quantification of the credit risk. Furthermore, the article carries out a theoretical development of the basic foundations of neuronal networks. In order to present the methodologies of measurements of credit risk, based upon the neuronal networks and to apply the to the data base of a commercial

  9. Anwendung stabiler Isotope zur Beschreibung des mikrobiellen Abbaus organischer Schadstoffe in kontaminierten Aquiferen

    OpenAIRE

    Vieth, Andrea

    2003-01-01

    Der mikrobielle in-situ Abbau organischer Schadstoffe ist mit einer Änderung der Isotopenverhältnisse (12C/13C; H/D) verbunden. Das Ausmaß der Isotopenfraktionierung ist abhängig von der initialen biochemischen Reaktion und variiert mit der Größe des Substratmoleküls bzw. der Anzahl der Kohlenstoff- bzw. Wasserstoffatome. Für die Anwendung dieses Isotopenkonzepts zur Beschreibung des mikrobiellen Abbaus von Schadstoffen im Grundwasser muss ausgeschlossen werden können, dass andere Prozesse ei...

  10. Aproximación de los problemas de optimización por redes neuronales artificiales

    Directory of Open Access Journals (Sweden)

    Caballero Fernandez, Rafael

    2001-01-01

    Full Text Available En el presente artículo, pretendemos aportar un conocimiento de cómo puede aproximarse un problema de optimización mediante la dinámica de las redes neuronales artificiales, específicamente mediante las redes de tipo Hopfield. La elección de este tipo de redes radica en el objetivo que nos hemos propuesto en el presente trabajo, la resolución on-line de los problemas de optimización lineal, cuadrática, no lineal y combinatoria. Construimos, desarrollamos y justificamos formalmente una metodología integral que permite recoger los distintos tipos de problemas de optimización y construir una red neuronal de tipo Hopfield que los resuelva de una manera computacionalmente adecuada y formalmente correcta, comparando los resultados obtenidos con los publicados más recientemente.

  11. Clasificación de semillas de malezas utilizando redes neuronales artificiales

    OpenAIRE

    Gavarini, Sebastián; Trípode, Martín; Tosini, Marcelo Alejandro; Ceccatto, Hermenegildo Alejandro

    2004-01-01

    El presente trabajo es continuación del estudio llevado a cabo en [Cec2000], trabajo en el que se desarrolló una herramienta para procesar imágenes de semillas de malezas capturadas por una cámara de video, a las que se les extraían características morfológicas, de color y de textura. Parte del trabajo fue precisamente la selección de las características más relevantes. Posteriormente se analizaron métodos de clasificación por Naïve Bayes [Alf2002] y Redes Neuronales Artificiales FeedForwa...

  12. SIMULACIÓN MEDIANTE REDES NEURONALES DEL ENFRIAMIENTO DEL ARCO ELÉCTRICO EN DISYUNTORES DE ALTA TENSIÓN

    Directory of Open Access Journals (Sweden)

    ALEXANDRO BRYANTSEVICH

    2010-07-01

    Full Text Available La formulación de los modelos analíticos de enfriamiento de los arcos eléctricos en disyuntores de alta tensión todavía presenta muchas dificultades, y requiere nuevas hipótesis que los simplifique sustancialmente en relación con la realidad. Desde un punto de vista técnico, la aplicación de las redes neuronales podría ser una fuente objetiva para la simulación del enfriamiento del arco eléctrico, y para obtener resultados más cercanos a las propiedades reales del interruptor. En este trabajo se describe la problemática del desarrollo de modelos analíticos vinculados al enfriamiento del arco eléctrico de disyuntores de alta tensión mediante redes neuronales.

  13. Evaluation von Bildungssoftware im Spannungsfeld von Objektivität und praktischer Anwendung

    Directory of Open Access Journals (Sweden)

    Cornelia Biffi

    2002-05-01

    Full Text Available Das Angebot an Bildungs- bzw. Lernsoftware umfasst eine breite Palette von sehr unterschiedlichen Produkten. Eigentliche Unterrichtssoftware, die speziell für den Unterricht hergestellt und auf Lehrmittel und Curriculum abgestimmt ist, gibt es kaum. Im Projekt «Lernsoftware Evaluation» des Pestalozzianums Zürich ermitteln Lehrpersonen die Qualität von Bildungssoftware, indem sie diese im Unterricht einsetzen und anhand eines Kriterienrasters beurteilen. Eine Analyse der in der Evaluation generierten Daten belegt die Problematik des Anspruchs einer objektiven Qualitätsbeurteilung. Es werden die Probleme bei der Anwendung von Kriterienraster und Beurteilungsmodus aufgezeigt und ermittelt, worin die subjektiven Qualitätsmassstäbe der Evaluierenden begründet sind. Diese Ausführungen sind Teil eines Forschungsprojekts für die Weiterentwicklung einer theoretisch fundierten, aber dennoch praxisnahen Evaluation von Bildungssoftware.

  14. Realidad Virtual Acústica: El Abordaje de las Redes Neuronales Artificiales

    Directory of Open Access Journals (Sweden)

    Jose Francisco Lucio

    2015-05-01

    Full Text Available En este trabajo se presenta un nuevo abordaje para obtener las respuestas impulsivas biauriculares (BIRs para un sistema de aurilización utilizando un conjunto de redes neuronales artificiales (RNAs. El método propuesto es capaz de reconstruir las respuestas impulsivas asociadas a la cabeza humana (HRIRs por medio de modificación espectral y de interpolación espacial. Para poder cubrir todo el espacio auditivo de recepción, sin aumentar la complejidad de la arquitectura de la red, una estructura con varias RNAs (conjunto fue adoptada, donde cada red opera en una región específica del espacio (gomo. El error de modelaje en el dominio de la frecuencia es investigado considerando la naturaleza logarítmica de la audición humana. A través de la metodología propuesta se obtuvo un ahorro del tiempo de procesamiento computacional de aproximadamente 62% en relación al método tradicional de procesamiento de señales utilizado para aurilización. La aplicabilidad del nuevo método en sistemas de aurilización es reforzada mediante un análisis comparativo de los resultados, que incluyen la generación de las BIRs y el cálculo de un parámetro acústico biauricular (IACF, los cuales muestran errores con magnitudes reducidas.

  15. Estrategias para el entrenamiento de redes neuronales de números difusos

    Directory of Open Access Journals (Sweden)

    Edwin Villarreal López

    2014-04-01

    Full Text Available El propósito de este artículo es presentar estrategias generales de entrenamiento para redes neuronales de números difusos utilizadas en el aprendizaje de sistemas a partir de información lingüística. Se exponen brevemente las principales tendencias en el entrenamiento de este tipo de sistemas y con base en ellas se proponen nuevas estrategias. La primera de ellas se basa en la retro-propagación del error cuadrático medio en todos los a-cortes para pesos crisp. La segunda hace uso de un algoritmo genético con codificación real para redes con pesos crisp. La tercera consiste en la retro-propagación del error en el valor promedio y la ambigüedad en todos los a-cortes para pesos difusos. Por último, se presenta una basada en la retro-propagación de una medida difusa del error para redes con pesos difusos. Se realiza una etapa experimental en la que se implementan los algoritmos desarrollados junto con algunos de los más representativos reportados en el estado del arte, permitiendo identificar para qué conjuntos de datos particulares resulta útil cada una de las estrategias. Finalmente, se aplican dichas estrategias para la implementación de un sistema de evaluación de impacto ambiental en vertederos.

  16. Geothermics and neural networks: A first approach; Geotermia y redes neuronales: Una primera aproximacion

    Energy Technology Data Exchange (ETDEWEB)

    Flores Armenta, Magaly del Carmen [Gerencia de Proyectos Geotermoelectricos de la Comision Federal de Electricidad, Morelia (Mexico); Barragan Orbe, Carlos [Comision Federal de Electricidad, Mexico, D. F. (Mexico)

    1995-09-01

    Neural networks have been hailed as the greatest technological advance since the transistor. They are predicted to be a common household item by the year 2000. This new form of machine intelligence is able to solve problems, without using rules of math, they only need examples to learn from. The first geothermal problem, to solve with this powerful tool, is the prediction of liquid and steam production, as well as the well`s termination in Los Humeros, Puebla, Mexico. The first attempt shows the learning`s capacity of the developed model, and its precision on the predictions that were done. [Espanol] Las redes neuronales se consideran como uno de los mas grandes avances tecnologicos desde la invencion del transistor, de tal forma que se perfilan como una de las herramientas mas comunes del ano 2000. Esta nueva forma de inteligencia artificial es capaz de resolver problemas sin utilizar reglas matematicas, solamente requiere de ejemplos para aprender de ellos. El primer problema geotermico, atacado con esta poderosa herramienta, es la prediccion de las producciones de vapor y liquido, asi como la terminacion de pozos en el campo geotermico de Los Humeros, Puebla, Mexico. Los primeros intentos demuestran la capacidad de aprender del modelo desarrollado, y su certeza en las predicciones realizadas.

  17. Un método cuantitativo para analizar redes neuronales marcadas por histoquímica para acetilcolinesterasa

    Directory of Open Access Journals (Sweden)

    Luz H. Camargo

    2004-12-01

    Full Text Available El análisis cualitativo de las redes neuronales por histoquímica enzimática se usa comúnmente en los estudios morfológicos tradicionales. Una limitante de este tipo de estudios consiste en la dificultad de obtener resultados cuantitativos. Este artículo presenta dos técnicas originales de procesamiento de imágenes para realizar estudios cuantitativos y un análisis comparativo entre ellas. Los resultados preliminares presentados permiten verificar la utilidad de la metodología aplicada.

  18. IDENTIFICACION DEL CILINDRO NUDOSO EN IMÁGENES TC DE TROZAS PODADAS DE PINUS RADIATA UTILIZANDO REDES NEURONALES ARTIFICIALES

    OpenAIRE

    Rojas Espinoza,Gerson; Ortiz Irribarren,Oscar

    2010-01-01

    La factibilidad de identificar el cilindro nudoso en imágenes de tomografía computarizada de rayos X (TC) de trozas podadas de pino radiata (Pinus radiata D. Don), fue evaluada utilizando un método de clasificación supervisada basado en Redes Neuronales Artificiales (RNA). El proceso de clasificación consideró también la identificación de la zona libre de defectos y nudos. Treinta trozas podadas de pino radiata fueron escaneadas en un escáner médico multi-slice de rayos X, donde las imágenes ...

  19. Pronóstico del IPC de la Bolsa Mexicana de Valores Mediante el Uso de Reglas y Redes Neuronales

    OpenAIRE

    Cázares Carrillo, Juan G.

    2004-01-01

    La presente investigación es un esfuerzo para el desarrollo de un pronosticador con resultados aceptables para el mercado de valores destinándose su uso como una herramienta de apoyo a la toma de decisiones financieras. El pronóstico se realiza mediante la identificación de patrones utilizando como herramientas técnicas de Inteligencia Artificial, específicamente Redes Neuronales de Retropropagación y Algoritmos Genéticos. Las principales aportaciones de la presente investigación son: la dete...

  20. Clasificación del clutter marino utilizando redes neuronales artificiales

    Directory of Open Access Journals (Sweden)

    Argel Gonzalez Padilla

    2013-04-01

    Full Text Available La detección de radar bajo la acción del clutter marino es un problema actual. La efectividad de esta detección puede ser mejorada o aún optimizada si el comportamiento estadístico de los parámetros de las señales dispersadas por la superficie del mar (clutter marino es conocida. En el presente trabajo, la mayoría de los modelos estadísticos del clutter marino bajo diferentes condiciones es dada y se logra en un solo documento de manera sintética agrupar un gran volumen de información, difícil de encontrar, y en muchos casos, de interpretar. La mayor contribución investigativa de este trabajo es la presentación de los fundamentos de un sistema auto adaptativo  para la detección de blancos de radar, basado en el reconocimiento de diferentes distribuciones que modelan las mediciones de amplituddelclutter marino, obtenida en un intervalo de tiempo dado. Realizando una clasificación más fina al especificar el rango de valores que toman los parámetros de la distribución, para el intervalo de tiempo que se analiza. Este sistema fue simulado satisfactoriamente utilizando redes neuronales.Los resultados revelaron que se puede realizar de forma efectiva el reconocimiento de distribuciones de mediciones de amplitud del clutter marino y de los parámetros de la distribución.

  1. Redes Neuronales y su aplicación predictiva en la Bolsa de Valores española

    Directory of Open Access Journals (Sweden)

    Ibarra Alfaraz, J.A.

    1999-01-01

    Full Text Available Este trabajo recoge una visión general de las redes neuronales y su tendencia en la investigación actual. Además de las aplicaciones conocidas donde las redes neuronales han demostrado su aplicabilidad se abren nuevos campos de investigación. En nuestro caso, nos centraremos en el área económica y más concretamente en la financiera. Esta metodología se aplica al caso concreto del análisis predictivo de la bolsa de valores, concretamente se utiliza el índice del mercado continuo de la bolsa española, Ibex-35, y los recientemente aparecidos índices sectoriales del Ibex: Servicios, Financiero, Utilities y Complementario. La red neuronal utilizada, Perceptron, ha sido entrenada con los datos reales procedentes de la bolsa de valores utilizando diferentes periodos de tiempo y efectuando cambios en los parámetros que condicionan la capacidad predictiva de la red. Los resultado se han contrastado con los obtenidos en otros trabajos empíricos realizados con metodologías clásicas.

  2. Estimación de la resistencia a la penetración de suelos usando redes neuronales artificiales

    Directory of Open Access Journals (Sweden)

    Nidia Johana Valdés Holguín

    2011-07-01

    Full Text Available Las redes neuronales artificiales, simuladoras del proceso de aprendizaje de las neuronas biológicas, han sido utilizadas con éxito en el cálculo de parámetros en diversos problemas de ingeniería en que las variables involucradas tienen una alta relación no lineal entre sí y la modelación no permite representar el problema mediante una función matemática de fácil deducción. En la ciencia del suelo la predicción de algunas propiedades involucra diversas variables que hacen de su estimación por medio de modelos matemáticos un proceso complejo, y trasladan la solución del problema al campo de la inteligencia artificial. En el presente artículo se reporta la elaboración de redes neuronales artificiales para la estimación de la resistencia a la penetración a diferentes profundidades de un suelo; se consideran como variables influyentes el contenido de humedad, la densidad, la carga estática y la presión de inflado. Los resultados muestran una mejor estimación para profundidades entre 20 cm y 30 cm.

  3. Application of C-arm computed tomography in cardiology; Kardiale Anwendung der C-Arm-Computertomographie

    Energy Technology Data Exchange (ETDEWEB)

    Rieber, J. [Klinikum der Ludwig-Maximilians-Universitaet Muenchen, Campus Innenstadt, Abteilung fuer Kardiologie, Medizinische Poliklinik, Muenchen (Germany); Rohkohl, C. [Friedrich-Alexander-Universitaet Erlangen-Nuernberg, Lehrstuhl fuer Mustererkennung, Department Informatik, Erlangen (Germany); Siemens AG, Healthcare Sector, Forchheim, Forchheim (Germany); Lauritsch, G. [Siemens AG, Healthcare Sector, Forchheim, Forchheim (Germany); Rittger, H. [Krankenhaus Coburg, Abteilung fuer Kardiologie, Coburg (Germany); Meissner, O. [Siemens AG, Healthcare Sector, Forchheim, Forchheim (Germany); Klinikum der Ludwig-Maximilians-Universitaet Muenchen, Institut fuer Klinische Radiologie, Muenchen (Germany)

    2009-09-15

    C-arm computed tomography is currently being introduced into cardiac imaging and offers the potential for three-dimensional imaging of the cardiac anatomy within the interventional environment. This detailed view is necessary to support complex interventional strategies, such as transcutaneous valve replacement, interventional therapy of atrial fibrillation, implantation of biventricular pacemakers and assessment of myocardial perfusion. Currently, the major limitation of this technology is its insufficient temporal resolution which limits the visualization of fast moving parts of the heart. (orig.) [German] Durch die Entwicklung der C-Arm-Computertomographie- (CACT-)Angiographie ist es erstmals moeglich, waehrend einer Herzkatheteruntersuchung eine detaillierte dreidimensionale Darstellung der kardialen Anatomie zu erhalten. Derartige zusaetzliche Informationen koennten die Durchfuehrung der immer komplexer werdenden Strategien der interventionellen Kardiologie wirkungsvoll unterstuetzen. Hierzu zaehlen u. a. der transkutane Klappenersatz, die interventionelle Behandlung von Vorhofflimmern, die Implantation biventrikulaerer Schrittmacher sowie die Beurteilung der Myokardperfusion. Die derzeit groesste Limitation dieser Methode ist die relativ geringe zeitliche Aufloesung, die aufgrund der Bewegung des Herzens die Anwendung dieser Technologie einschraenkt. (orig.)

  4. Biofuels - Properties and application experience; Biokraftstoffe - Eigenschaften und Erfahrungen bei der Anwendung

    Energy Technology Data Exchange (ETDEWEB)

    Schmiedel, H.P.

    2002-12-01

    The European Union wants to promote the use of renewable raw materials also in the traffic sector in order to meet the internationally committed reduction of carbon dioxide emissions. At the same time a new market shall be created for farming and jobs shall be secured. Fatty acid methyl esters in the diesel market and ethanol and ethyl tertiary butyl ether (ETBE) in gasoline are discussed as compounds that can be produced from renewable raw materials and be applied as fuels in the short term. This literature survey deals with the extent of CO{sub 2} / greenhouse gas emission reductions, the availability of biofuels and summarizes the economical and technical experiences obtained so far with their application. The use of pure vegetable oils, dimethylether and pyrolysis oil is also briefly covered. (orig.) [German] Die EU will auch im Verkehrsbereich den Einsatz nachwachsender Rohstoffe foerdern, um die international zugesagte Reduzierung der Kohlendioxid-Emissionen zu erreichen. Gleichzeitig sollen damit der Landwirtschaft ein neuer Markt eroeffnet und Arbeitsplaetze gesichert werden. Fettsaeuremethylester fuer den Dieselbereich sowie Ethanol und Ethyltertiaerbutylether (ETBE) fuer Ottokraftstoff werden als Verbindungen genannt, die aus nachwachsenden Rohstoffen gewonnen und kurzfristig als Kraftstoff eingesetzt werden koennen. Die vorliegende Literaturstudie beleuchtet den Umfang der CO{sub 2}- bzw. Klimagasreduktion, die Verfuegbarkeit der Biokraftstoffe und fasst die oekonomischen und technischen Erfahrungen zusammen, die bisher in ihrer Anwendung erhalten wurden. Die Nutzung von reinen Pflanzenoelen, Dimethylether und Pyrolyseoel wird gestreift. (orig.)

  5. Methandiid-basierte Cabenkomplexe: Von ihrer Synthese und elektronischen Struktur zur Anwendung in Bindungsaktivierungsreaktionen und katalytischen Umsetzungen

    OpenAIRE

    Weismann, Julia

    2015-01-01

    Die vorliegende Arbeit beschäftigt sich mit der Anwendung des Sulfonyl-stabilisierten Methandiids 20-Li2 als Ligand in Übergangsmetallkomplexen. Dabei konnte 20-Li2 mit ver-schiedenen Übergangsmetallhalogeniden in Salzmetathesereaktionen umgesetzt werden. Insgesamt wiesen die synthetisierten Methandiid-basierten Komplexe flexible Bindungsverhältnisse bezüglich der MC-Bindung und unterschiedliche Koordinationsmodi der Sulfonyl-Gruppe auf, die die Stabilität und Reaktivität der Komplexe signif...

  6. Uso de redes neuronales artificiales para mejorar el tránsito en las vías

    Directory of Open Access Journals (Sweden)

    Edwin Mejía

    2016-11-01

    Full Text Available Este artículo pretende dar una idea de cómo las Redes Neuronales Artificiales (ANNs, una técnica de la Inteligencia Artificial (IA, se puede acoplar a resolver el problema del tráfico en las vías de la ciudad de Riobamba, provincia de Chimborazo, país Ecuador, usando cuatro semáforos estándar, a través de un ejemplo se indica el uso de componentes electrónicos como FPGAs (Field Programmable Gate array y los sensores en este campo, a través de detectar y contar autos puede dar mayor fluidez al tráfico. La vía que mayor cantidad de autos tenga se dará mayor prioridad para la luz verde. Usando el algoritmo de aprendizaje de un Perceptrón Simple.

  7. Pronóstico de los índices accionarios DAX y S&P 500 con redes neuronales diferenciales

    Directory of Open Access Journals (Sweden)

    Francisco Ortiz Arango

    2013-01-01

    Full Text Available En este trabajo se utiliza una red neuronal diferencial (RND para describir las series de valores de cierre diarios de los índices accionarios DAX de Alemania y S&P 500 de Estados Unidos entre el periodo del 3 de julio de 2000 y el 13 de enero de 2012. Con la RND se lleva a cabo el pronóstico de los valores de cierre diarios de esos índices durante un periodo de cuatro semanas (del 16 de enero al 10 de febrero de 2012. Los resultados obtenidos confirman el hecho de que las redes neuronales diferenciales pueden constituirse en una de las herramientas más poderosas y precisas para poder pronosticar valores futuros de activos financieros.

  8. BIOINDICACIÓN DE LA CALIDAD DEL AGUA CON MACROINVERTEBRADOS ACUÁTICOS EN LA SABANA DE BOGOTÁ, UTILIZANDO REDES NEURONALES ARTIFICIALES

    Directory of Open Access Journals (Sweden)

    GUTIÉRREZ JUAN DAVID

    2004-06-01

    Full Text Available Se presenta una implementación de la metodología de redes neuronales (RN comoherramienta para la estimación de la calidad del agua en la cuenca alta y media del ríoBogotá, Colombia. Los datos usados provienen de 55 sitios correspondientes aonce cuencas de la sabana de Bogotá. Los resultados obtenidos con la aplicaciónde la RN fueron comparados con los valores del índice fisicoquímico Cfq y del índicede bioindicación ASPT (Average Score Per Taxon, para comprobar el grado deconfiabilidad de la metodología.Palabras clave. Redes neuronales,

  9. IMPLEMENTACIÓN DE REDES NEURONALES PARA LA DETECCIÓN DE LA PRESENCIA DE ENFERMEDADES EN EL CORAZÓN

    OpenAIRE

    José A. Avellaneda González; Cynthia M. Ochoa Rey

    2012-01-01

    A  continuación  por  medio  de  dos  métodos  para la implementación  de  redes  neuronales  y  una base  de  datos que presenta    diferentes    características    de pacientes, algunos presentan algún  tipo  de  enfermedad  del  corazón y otros  no.  Se desarrollo  en una  primera  parte redes neuronales  supervisadas, específicamente  se  implementa un perceptrón   multicapa;  la segunda parte plantea  redes  no supervisadas,  implementando una red ART2 (Adaptive resonance theory).: Época...

  10. Optimización de la Estimación de DOA en Sistemas de Antenas Inteligentes usando criterios de Redes Neuronales

    Directory of Open Access Journals (Sweden)

    Serguei Guerra Fernández

    2013-04-01

    Full Text Available La estimación DOA es uno de los principales problemas a resolver en las comunicaciones modernas. En el presente trabajo, se realiza un acercamiento a los sistemas de Antenas Inteligentes y los elementos teóricos referidos a la estimación de DOA, ecuaciones y modelos. Se estudian los métodos clásicos de estimación y las nuevas técnicas basadas en Redes Neuronales. Se traza una metodología para la obtención de resultados, a partir de parámetros medibles, en cada uno de los algoritmos de estimación sometidos a comparación. Finalmente, se analizan los resultados y se propone utilizar técnicas basadas en Redes Neuronales a fin de mejorar la estimación de DOA en Antenas Inteligentes.

  11. Diagnóstico automático del síndrome coronario agudo utilizando un sistema multiagente basado en redes neuronales

    Directory of Open Access Journals (Sweden)

    John Jaime Sprockel Díaz

    2017-05-01

    Conclusiones: Es posible desarrollar una herramienta para el diagnóstico automático del síndrome coronario agudo a partir de un sistema multiagente que ensamble la disposición tomada por un conjunto de redes neuronales artificiales, cuyo rendimiento permite su consideración para su implementación dentro de un sistema de soporte a las decisiones clínicas.

  12. Hydrogen in motor car engineering. Production, storage, use. 3. rev. ed.; Wasserstoff in der Fahrzeugtechnik. Erzeugung, Speicherung, Anwendung

    Energy Technology Data Exchange (ETDEWEB)

    Eichlseder, Helmut [Technische Univ., Graz (Austria). Inst. fuer Verbrennungskraftmaschinen und Thermodynamik; Klell, Manfred [HyCentA Research GmbH, Graz (Austria)

    2012-07-01

    The book outlines the various aspects of properties, generation, storage and uses of hydrogen. The focus is on the thermodynamics of hydrogen storage and on its applications in vehicle engineering and energy engineering. Using the example of current research projects of TU Graz university and HyCentA, the state of the art is presented in some detail. The sections on fuel cells for automotive power generation, hydrogen/methane mixtures and legal and safety aspects have been updated. [German] Dieses Buch bietet einen allgemeinen Ueberblick ueber die verschiedenen Aspekte von Eigenschaften, Erzeugung, Speicherung und Anwendung von Wasserstoff. Schwerpunkte liegen auf der Thermodynamik der Speicherung von Wasserstoff sowie auf der Anwendung in der Fahrzeugtechnik und in der Energietechnik. Mit Bezug zu Forschungsvorhaben an der TU Graz und dem HyCentA wird der aktuelle Stand der Technik fundiert dargestellt. Aktualisiert und ergaenzt wurden vor allem die Abschnitte ueber Brennstoffzellen zur Stromerzeugung fuer Elektroantriebe, ueber Gemische aus Wasserstoff und Methan sowie ueber Fragen von Recht und Sicherheit.

  13. The integrity concept and its implementation; Das Integritaetskonzept und seine praktische Anwendung

    Energy Technology Data Exchange (ETDEWEB)

    Roos, E.; Herter, K.H.; Schuler, X. [Stuttgart Univ. (Germany). MPA; Koenig, G. [EnBW Kernkraft GmbH, Neckarwestheim (Germany)

    2008-07-01

    , dass fuer die Gewaehrleistung von Bruchausschluss die Beherrschung der Ursachen von im Betrieb moeglichen Schaedigungsmechanismen von entscheidender Bedeutung ist. Im Gegensatz dazu stellt das ''Integritaetskonzept'' als Umsetzung des Basissicherheitskonzepts unter Beruecksichtigung der jeweiligen anlagenspezifischen Voraussetzungen ein geschlossenes Gesamtkonzept dar, das der Notwendigkeit einer mehrstufigen Absicherung und ''laufender'' Aktualisierung Rechnung traegt. Das Integritaetskonzept ist Bestandteil des Alterungsmanagements fuer mechanische Komponenten und Systeme. Am Beispiel der Speisewasserleitung innerhalb Containment der Anlage GKN 1 wird dessen praktische Anwendung zum Nachweis der Integritaet aufgezeigt. (orig.)

  14. Application of the EC pressure equipment directive in the gas industry; Die Anwendung der EG-Druckgeraeterichtlinie in der Gaswirtschaft

    Energy Technology Data Exchange (ETDEWEB)

    Bueschel, K. [Deutscher Verein des Gas- und Wasserfaches e.V., Bonn (Germany); John, M. [Karlsruhe Univ. (T.H.) (Germany). DVGW-Forschungsstelle am Engler-Bunte-Institut; Wasser, U. [Bundesverband der Deutschen Gas- und Wasserwirtschaft e.V., Bonn (Germany)

    2000-07-01

    The EC Pressure Equipment Directive primarily concerns that broad range of equipment that falls under the Equipment Safety Act and its regulations on pressure vessels, boilers etc. Meanwhile, however, the mainstream view is that also some equipment of the gas industry is affected although its pipeline systems have been excluded from the Directive. The interpretation of the Directive must take into account this background in order to reach satisfactory conclusions in the actual application of the Directive to the components of the gas industry. (orig.) [German] Die EG-Druckgeraeterichtlinie betrifft primaer jenes grosse Geraetespektrum, das unter das Geraetesicherheitsgesetz und dessen Verordnungen zu Druckbehaeltern, Dampfkesseln etc. faellt. Inzwischen herrscht jedoch die Meinung vor, dass auch bestimmte Anlagenteile der Gaswirtschaft erfasst werden, obwohl deren Rohrleitungssysteme von der Richtlinie ausgenommen worden sind. Die Auslegung der Richtlinie muss diesen Hintergrund beachten, um zu befriedigenden Aussagen bei ihrer konkreten Anwendung auf die Komponenten der Gaswirtschaft zu gelangen. (orig.)

  15. Una técnica de pronóstico de señales basada en redes neuronales

    Directory of Open Access Journals (Sweden)

    Jorge Eduardo Ortiz T.

    2001-10-01

    Full Text Available El creciente interés por construir sistemas de procesamiento de señales mediante redes neuronales, especialmente durante los últimos veinte años, se debe a la posibilidad de avances significativos en campos poco explorados y cuyo manejo resulta de naturaleza compleja. Uno de estos campos es la predicción de señales. Una señal es una colección de valores que, generalmente, representan mediciones sucesivas de un evento del mundo real, los valores se toman durante un tiempo específico a intervalos regulares, representando una muestra del evento que se desea estudiar o de las características propias del mismo. La predicción de una señal consiste en obtener un conjunto de valores que, según un margen de error aceptable, constituyen una estimación del comportamiento futuro de la señal. El proceso de predicción es mucho más que la posición simplista de aventurar valores; puesto que requiere la construcción de un modelo adecuado de la dinámica del sistema a tratar.

  16. Identificación del estado de madurez de las frutas con redes neuronales artificiales, una revisión

    Directory of Open Access Journals (Sweden)

    Gustavo Andrés Figueredo-Ávila

    2016-01-01

    Full Text Available La aplicación de las Redes Neuronales Artificiales (RNA y de la visión artificial tiene cada vez más acogida en la industria de productos alimenticios; estas técnicas priorizan la clasificación, el reconocimiento de patrones y la predicción de las cosechas y de los cambios físicos de sus productos. En este artículo se define el concepto de red neuronal y se describen sus principales características y modelos, y, por otro lado, se define el concepto de procesamiento de imágenes digitales y las diferentes etapas que lo componen. Complementariamente, se exponen las generalidades de la inspección de frutas (enfocada en Colombia y sus técnicas. Finalmente, se especifican diferentes trabajos en los que se aplicaron técnicas de RNA y visión artificial en el campo de los productos alimenticios, dispuestos por áreas de  aplicación, y se identifica de manera concluyente el impacto que estas dos técnicas tienen para la clasificación, el reconocimiento de patrones y la predicción en el sector de productos alimenticios.

  17. EXPLORACIÓN CON REDES NEURONALES ARTIFICIALES PARA ESTIMAR LA RESISTENCIA A LA COMPRESIÓN, EN CONCRETOS FIBROREFORZADOS CON ACERO

    Directory of Open Access Journals (Sweden)

    Luis Octavio González Salcedo

    2012-01-01

    Full Text Available En diseño y construcción de estructuras de concreto, la resistencia a la compresión a 28 días de curado es la especificación de control de estabilidad de la obra. La inclusión de fibras como reforzamiento de la matriz cementicia permite una ganancia en sus propiedades, además de obtener un material de alto desempeño. En las normativas, se plantean formulaciones predictivas de la resistencia a la compresión basadas en unos pocos parámetros de composición del concreto, tales como la relación agua/cemento y el contenido de cemento Portland. Por otra parte, también se han planteado métodos de diseños de concreto para definir la ponderación de sus materiales componentes, teniendo como referencia la resistencia a la compresión del concreto simple. Además, las redes neuronales artificiales, como un símil de las neuronas biológicas, han sido utilizadas como herramientas de predicción de la resistencia a la compresión en el concreto, también con referencia al concreto simple, sin reforzamiento con fibras. Los antecedentes en este uso muestran que es interesante desarrollar aplicaciones en los concretos reforzados con fibras. En el presente trabajo se elaboraron redes neuronales artificiales para predecir la resistencia a la compresión en concretos reforzados con fibras de acero. Los resultados de los indicadores de desempeño mostraron que las redes neuronales artificiales elaboradas pueden realizar una aproximación adecuada al valor real de la propiedad mecánica.

  18. Uso de redes neuronales artificiales para identificación de personas mediante el reconocimiento de rostros de la Municipalidad de la Victoria - Lima - 2015

    OpenAIRE

    Arriola Ramírez, Franklin

    2015-01-01

    En el presente proyecto se aplicará reconocimiento de imágenes mediante redes neuronales para la identificación de rostros, lo cual será utilizado para el diseño de un prototipo que permita verificar que las personas que participen de las actividades organizadas por la Municipalidad de La Victoria-Lima sean solamente los beneficiarios debidamente registrados en los Programas Sociales. La identificación de rostros de personas será captada en tiempo real con una cámara ...

  19. Subpoblaciones neuronales presentes en cultivos primarios de ganglio espinal y su relación con la infección in vitro por virus de rabia

    OpenAIRE

    Hernán Hurtado; Jaime E. Castellanos; Niyibi Quiroga; Marlén Martínez

    2000-01-01

    El virus de la rabia presenta un fuerte tropismo neuronal y que produce una encefalitis generalmente letal. En un accidente rábico clásico, producido por la mordedura de un animal infectado, el virus es captado por terminaciones nerviosas motoras, autonómicas o sensoriales. Si es captado por estas últimas, el virus se transporta retrógradamente hacia los somas neuronales ubicados en los ganglios espinales y de...

  20. Estudio de los circuitos neuronales responsables de ritmopatías y déficit cognitivo en modelos experimentales de epilepsia del lóbulo temporal

    OpenAIRE

    Valero García, Manuel

    2017-01-01

    En periodos de inmovilidad y sueño de ondas lentas emerge en el hipocampo el patrón de actividad más síncrono del cerebro de mamífero: los eventos sharp wave (SPW-r). Gran número de trabajos han demostrado que el reclutamiento celular durante tales eventos recopila secuencias neuronales computacionalmente relevantes, fenómeno que subyace al proceso de consolidación de la memoria. Todas las condiciones que cursan con déficit cognitivos han sido asociadas a alteraciones en los SPW-r, incluyendo...

  1. Hypnose, sommeil, placebo ? : Les réponses de la Théorie neuronale de la Cognition – Tome 2

    OpenAIRE

    Touzet , Claude

    2014-01-01

    International audience; Initialement uniquement dédié aux quelques « faits » comme :l'hypnose, le plaisir, le sommeil et les rêves, la responsabilité, l'effet placebo et la schizophréniequi n'avaient pas reçu d'explications de la part de la Théorie neuronale de la Cognition (tome 1 – Conscience, intelligence, libre-arbitre), ce second opus a rapidement dévié de sa mission originale pour intégrer des aspects encore plus controversés, comme :- le paranormal,- l'influence de l'intention sur la r...

  2. Reconocimiento automático de locutor a través de aprendizaje automático mediante redes neuronales empleando el paquete de software libre Kaldi

    OpenAIRE

    Jiménez Andreu, Rubén

    2017-01-01

    El objetivo del presente Proyecto Fin de Máster es presentar algunas técnicas para reconocimiento de hablante empleando redes neuronales y deep learning. Como referencia se emplean vectors y un modelo universal basado en mezclas gaussianas (GMM-UBM) como método del estado del arte. El proceso de entrenamiento es realizado con la base de datos de audiolibros LibriSpeech. Esta base también se emplea para evaluar los modelos, junto con la de Speakers in the Wild, con locucion...

  3. “USO DE REDES NEURONALES ARTIFICIALES PARA OPTIMIZAR LA DOSIFICACIÓN DE COAGULANTES EN LA PLANTA DE TRATAMIENTO DE AGUA POTABLE - HUANCAYO”

    OpenAIRE

    Peña Rojas, Anieval Cirilo

    2016-01-01

    En la investigación se utilizaron las redes neuronales artificiales como herramienta para optimizar la cantidad de coagulante (Al2SO4) que se utiliza en el tratamiento del agua potable de la empresa SEDAM de la ciudad de Huancayo – Perú, donde la calidad del agua al ingreso a la planta de tratamiento tuvo variabilidad permanente de turbidez debido a las precipitaciones fluviales que se presentaron generalmente en los meses de octubre a marzo. Este fenómeno meteorológico alteró en corto tiempo...

  4. Detección en línea de onda-P en sismogramas 3-D utilizando redes neuronales

    Directory of Open Access Journals (Sweden)

    Alzate Carlos

    2003-08-01

    Full Text Available

    We have developed a P-wave arrival time detector of tectonic events over digital three-component records online. This process uses two different methods: the first one works with a LVR detector, and the second one uses a statistical classifier of classes (signal with P-wave and signal with seismic noise. Detection uses multi-layer perceptron neural network where is taken advantage of non-lineal input-output, relation, well-generalization, low computational demands, etc. These appropriate qualities for real time signal processing. The input data for the system becomes a normalized vector of seismic signal and its polarization arguments. Testes were done with data from IRIS and INGEOMINAS database. Although the system has a good perforance, its accuracy is not acceptable.

    Se desarrolla un detector en línea del tiempo de arribo de ondas P sobre registros electrónicos de tres componentes de eventos tectónicos. Se lleva a cabo la detección en línea de la onda-p empleando redes neuronales (RN, utilizando dos diferentes formas: en la primera se sintetiza el detector de LRV, mientras en la segunda se desarrolla un clasificador estadístico con las respectivas clases (señal con onda-p presente y señal con solo ruido presente. La detección se realiza empleando redes neuronales de tipo perceptrón multi-capa, en las cuales se aprovechan las siguientes cualidades: su capacidad de mapeo no lineal de entrada-salida, buena generalización, bajo costo computacional, entre otras. Las anteriores cualidades hacen que las RN sean apropiadas para el proceso de señales en tiempo real. Las entradas a la RN corresponden a

  5. Status reports on the development and application of acoustic emission analysis. Proceedings; Statusberichte zur Entwicklung und Anwendung der Schallemissionsanalyse. Beitraege

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2009-07-01

    This proceedings-CD comprises 20 papers presented at the 17. Kolloquium Schallemission (Acoustic Emission Colloquium) at Bad Schandau. The following subjects were discussed: 1. Acoustic emission analysis of tensile tests on standard test specimens of different wood materials; 2. Application of pattern recognition methods for damage analyses of fibre-reinforced plastics; 3. Acoustic emission analysis for measuring crack growth in finned armor steel under dynamic load; 4. Acoustic emission analysis with zonal sound location: Test objects, test results and evaluation of acoustic emission signals; 5. Acoustic emission analysis in overall fatigue testing of a wind rotor blade; 6. Laboratory methods for assessing the sensitivity of acoustic emission sensors; 7. Acoustic emission analysis in burst tests of cast aluminium casings; 8. Visualization of acoustic emission localizations; 9. Threshold-independent and complete recording of characteristics and wave forms of transient and continuous acoustic emission; 10. Characterization of wide-band acoustic emission sensors; 11. Handling of large data volumes in acoustic emission analysis, a contribution to the development of algorithms; 12. Acoustic emission analysis and ultrasonic analysis for the characterization of crack networks in saline rock. One of the papers is available as a separate record in this database. [German] Diese Tagungs-CD enthaelt 20 Vortraege, die auf dem 17. Kolloquium Schallemission in Bad Schandau gehalten wurden. Die Themen waren: 1. Schallemissionsanalyse von Zugversuchen an Standardpruefkoerpern aus unterschiedlichen Holzwerkstoffen; 2. Anwendung von Mustererkennungsverfahren zur Schadensanalyse in faserverstaerkten Kunststoffen; 3. Anwendung der Schallemissionsanalyse zur Ermittlung des Risswachstums bei schwingender Beanspruchung von geripptem Bewehrungsstahl; 4. Schallemissionspruefung mit zonaler Ortung Pruefobjekte, Pruefergebnisse und Nachbewertung von Schallemissionssignalen; 5

  6. PRONÓSTICO DE VENTAS: COMPARACIÓN DE PREDICCIÓN ENTRE REDES NEURONALES Y MÉTODO ESTADÍSTICO [doi: 10.5329/RECADM.20030201008

    Directory of Open Access Journals (Sweden)

    S. Nojek

    2003-05-01

    Full Text Available Normal 0 21 false false false PT-BR X-NONE X-NONE MicrosoftInternetExplorer4 RESUMEN Actualmente es común que las empresas realicen pronósticos de ventas para poder planificar más acertadamente su producción. El objetivo de este trabajo consiste en estudiar la predicción de ventas mediante el uso de redes neuronales, comparar los resultados obtenidos con los pronósticos de un método estadístico clásico y establecer los entornos más adecuados para su uso. Palabras Clave: Pronostico de Ventas – Predicción basada en Redes Neuronales.   ABSTRACT Companies usually need sales forecast for improving production planning. This research work pursues to study sales forecast based on neural networks and to compare this results with the ones based on classical statistical methods trying to specify the adequate business environment for using them Keywords: Sales Forecast – Forecasting based on Neural Networks

  7. Neuronal networks for the study of buildings thermal behavior; Redes neuronales para el estudio del comportamiento termico de edificios

    Energy Technology Data Exchange (ETDEWEB)

    Marincic, Irene [Universidad de Sonora (Mexico); Del Rio, J. Antonio [Centro Morelense de Innovacion y Transferencia Tecnologica (Mexico)

    2009-07-15

    The evaluation as well as the prediction of buildings thermal behavior involves complex calculations mainly because of its enormous number of variables, many of them difficult to determine. For this type of problems, a possibility is to resort to models of the black box type, that allow the characterization of the building with very few variables, for then to be able to predict its behavior under other circumstances, with greater certainty. One of the black box models of more and more used in diverse disciplines, is the one of the artificial neuronal networks (ANN). These can be used as an alternative method of analysis and prediction, particularly for cases in which many variables take part. In this work a preliminary study is presented that analyzes the accuracy of a model of neuronal network for the prediction of the inside temperatures of a building, given the outside temperatures. A very simple network, of 3 neurons, located in 2 layers is considered. The results of the inside temperatures obtained in the learning as well as in the prediction stage are analyzed, comparing them with the ones obtained using another model of black box previously developed by the authors, the one of the function responded in the dominion of frequencies. [Spanish] Tanto la evaluacion como la prediccion del comportamiento termico de los edificios involucra calculos complejos sobre todo por su enorme numero de variables, muchas de ellas dificiles de determinar. Para este tipo de problemas, una posibilidad es recurrir a modelos del tipo caja negra, que permiten caracterizar al edificio como muy pocas variables, para luego poder predecir su comportamiento bajo otras circunstancias, como mayor certeza. Uno de los modelos de caja negra cada vez mas utilizado en diversas disciplinas, es el de las redes neuronales artificiales (ANN). Estas pueden ser usadas como metodo alternativo de analisis y sobre todo de prediccion, particularmente para los casos en que intervienen muchas variables. En

  8. Artificial Neural Networks for Predicting Real Estate Prices || Redes neuronales artificiales para la predicción de precios inmobiliarios

    Directory of Open Access Journals (Sweden)

    Núñez Tabales, Julia M.

    2013-01-01

    Full Text Available Econometric models, in the estimation of real estate prices, are a useful and realistic approach for buyers and for local and fiscal authorities. From the classical hedonic models to more data driven procedures, based on Artificial Neural Networks (ANN, many papers have appeared in economic literature trying to compare the results attained with both approaches. We insist on the use of ANN, when there is enough statistical information, and will detail some comparisons to hedonic modeling, in a medium size city in the South of Spain, with an extensive set of data spanning over several years, collected before the actual downturn of the market. Exogenous variables include each dwelling's external and internal data (both numerical and qualitative, and data from the building in which it is located and its surroundings. Alternative models are estimated for several time intervals, and enabling the comparison of the effects of the rising prices during the bull market over the last decade. || Los modelos econométricos en la valoración de precios inmobiliarios constituyen una herramienta útil tanto para los compradores como para las autoridades locales y fiscales. Desde los modelos hedónicos clásicos hasta los planteamientos actuales a través de redes neuronales artificiales (RNA, han tenido lugar numerosas aportaciones en la literatura económica que tratan de comparar los resultados de ambos métodos. Insistimos en el empleo de RNA en el caso de disponer de suficiente información estadística. En este trabajo se aplica dicha metodología en una ciudad de tamaño medio situada en el sur de España, utilizando una extensa muestra de datos que comprende varios años precedentes a la crisis actual. Las variables utilizadas -tanto cuantitativas como cualitativas- incluyen datos externos e internos de la vivienda, del edificio en el que está localizada, así como de su entorno. Se construyen varios modelos alternativos para distintos intervalos de

  9. Gerbstoffe aus Potentilla officinalis wirken entzündungshemmend im UV-Erythem-Test und bei Anwendung auf atopischer Haut.

    Science.gov (United States)

    Hoffmann, Julia; Wölfle, Ute; Schempp, Christoph M; Casetti, Federica

    2016-09-01

    Das Rhizom von Potentilla officinalis (PO) ist reich an Gerbstoffen und wird traditionell zur äußerlichen Behandlung von Entzündungen der Haut und der Schleimhäute verwendet. Ziel der vorliegenden Arbeit war die Bestätigung der antiinflammatorischen Eigenschaften von PO mittels eines UV-Erythem-Tests und einer klinischen Anwendungsstudie bei atopischer Haut. Die antiinflammatorische Wirkung eines PO-Extrakts (standardisiert auf 2 % Trockensubstanz) wurde in einer prospektiven, randomisierten, placebokontrollierten Doppelblindstudie mit 40 gesunden Erwachsenen im UV-Erythem-Test im Vergleich zu 1 % Hydrocortisonacetat untersucht. Im Rahmen einer prospektiven nicht kontrollierten Studie wurde die Wirkung und Verträglichkeit der 2 % PO-Creme an zwölf Erwachsenen und zwölf Kindern mit atopischer Haut nach Anwendung über zwei Wochen in einem definierten Testareal anhand eines Teil-SCORAD untersucht. Zusätzlich wurde die Beeinflussung der Hautrötung im Testareal photometrisch gemessen. Im UV-Erythem-Test zeigte die PO-Creme eine signifikante Reduktion des Erythemindex im Vergleich zum Vehikel. Die antiinflammatorische Wirkung des Verums entsprach der der 1 % Hydrocortisonacetat-Creme. Die klinische Studie bei Atopikern zeigte eine signifikante Abnahme des Teil-SCORAD und des Erythems im Testareal. Es wurden keine Unverträglichkeitsreaktionen beobachtet. PO als 2%ige Zubereitung besitzt entzündungshemmende Eigenschaften und ist wirksam und gut verträglich auf atopischer Haut. © 2016 Deutsche Dermatologische Gesellschaft (DDG). Published by John Wiley & Sons Ltd.

  10. Optimización de secciones de vigas y columnas para el cumplimiento de la deriva en edificaciones de concreto reforzado mediante Redes Neuronales Artificiales

    Directory of Open Access Journals (Sweden)

    Jorge Arcila Zea

    2014-01-01

    Full Text Available Este artículo presenta los resultados del uso de Redes Neuronales Artificiales (RNA para la estimación de secciones óptimas de vigas y columnas en concreto reforzado en edificaciones aporticadas simétricas de 1 a 6 pisos teniendo en cuenta los requisitos mínimos exigidos en la NSR-10 relacionados con la deriva y el diseño sísmico. Además se estudió la sensibilidad de la deriva respecto a los valores de dimensiones de vigas y de columnas, para que una vez se tenga una mejor comprensión de dicha relación, se puedan obtener diseños óptimos de manera más rápida, sencilla y confiable en comparación con los procedimientos utilizados actualmente.

  11. Teoría de precios de arbitraje. Evidencia empírica para Colombia a través de redes neuronales

    Directory of Open Access Journals (Sweden)

    Charle Londoño

    2011-07-01

    Full Text Available Esta investigación utiliza una red neuronal multicapa para relacionar el Índice General de Bolsa de Valores de Colombia (IGBC con fundamentales macroeconómicos y variables financieras. Proponemos dos modelos: un modelo APT (fundamentales macroeconómicos y un modelo APT modificado (fundamentales macroeconómicos + indicador de las bolsas del mundo; de acuerdo a nuestro análisis el APT tradicional se ajusta mejor para predecir el mercado de valores Colombiano. Los resultados confirman que las redes neuronales artificiales (ANN son más efectivas que los modelos estadísticos tradicionales por su capacidad explicativa y precisión.

  12. Modelación del crecimiento de pollitas Lohmann LSL con redes neuronales y modelos de regresión no lineal

    Directory of Open Access Journals (Sweden)

    Luis Galeano-Vasco

    2013-11-01

    Full Text Available Objetivo. Modelar la curva del crecimiento de aves de la línea Lohmann LSL utilizando modelos no lineales (MNL, no lineales mixtos (MNLM y redes neuronales artificiales (RNA. Materiales y métodos. Periódicamente se pesaron 33 aves en promedio, desde el día 21 al 196 de vida para un total de 558 registros individuales de peso. En el ajuste de la curva de crecimiento se utilizaron los modelos: no lineal de Von Bertalanffy (MNL, no lineal Mixto de Von Bertalanffy (MNLM y redes neuronales artificiales (RNA. Los modelos se compararon con coeficiente de correlación y medidas de presicion cuadrado medio del error (CME, desviación media absoluta (MAD y porcentaje de la media absoluta del error (MAPE. Resultados. Los valores de correlación entre los datos reales y estimados, fueron 0.999, 0.990 y 0.986 para MNLM, RNA y MNL respectivamente. El modelo más preciso con base en los criterios MAPE, MAD y CME fue el MNLM, seguido por la RNA. La grafica de predicción generada la RNA es similar a la del MNLM. La RNA presentó un desempeño superior al MLN. Conclusiones. El mejor modelo para la predicción de curvas de crecimiento de aves comerciales de la línea Lohmman LSL hasta los 196 días de edad, con múltiples mediciones por animal en el tiempo, fue el MNLM. La RNA presento un desempeño superior al MNL.

  13. Pronóstico del rendimiento del IPC (Índice de Precios y Cotizaciones mediante el uso de redes neuronales diferenciales

    Directory of Open Access Journals (Sweden)

    Agustín Ignacio Cabrera Llanos

    2012-01-01

    Full Text Available A través de los años, el uso de las redes neuronales artificiales como herramienta de simulación, modelación y descripción de sistemas dinámicos no lineales se ha ido consolidando como una técnica eficaz y relativamente rápida gracias al gran desarrollo experimentado en los sistemas de cómputo. Esta técnica de uso común en algunas áreas de la ingeniería aplicada se empezó a utilizar en aplicaciones financieras a mediados de la década de los noventa. El presente trabajo utiliza una de las técnicas más recientes y poderosas en este ámbito: las redes neuronales diferenciales (RND, usada frecuentemente en análisis de procesos de la biotecnología. Mediante esta técnica se lleva a cabo el análisis y la estimación de la evolución del comportamiento del rendimiento del IPC de la Bolsa Mexicana de Valores (BMV durante el periodo comprendido del 8 de noviembre de 1991 al 27 de enero de 2011. Adicionalmente, el análisis incluye un pronóstico intradía (seis valores durante una jornada de operación de la BMV del rendimiento del IPC, el cual tiene una duración de un día después del último dato de la serie de tiempo del IPC. Cabe señalar que los resultados pronosticados mostraron una gran similitud con los datos reales.

  14. Intravenous administration of iodinated, non-ionic, low or isoosmolar contrast media: safety aspects; Intravenoese Anwendung von jodiertem, nichtionischem, nieder- bis isoosmolarem Kontrastmittel: Sicherheitsaspekte

    Energy Technology Data Exchange (ETDEWEB)

    Metz-Schimmerl, S.; Metz, V.; Schima, W.; Herold, C. [Universitaetsklinik fuer Radiodiagnostik und Ludwig Boltzmann-Institut fuer Klinische und Experimentelle Radiologie, Wien (Austria); Domanovits, H. [Universitaetsklinik fuer Notfallmedizin Wien, Wien (Austria)

    2002-01-01

    It iss the purpose of this review to provide information about the safe use of intravenously administered, iodinated, non-ionic, low or isoosmolar contrast media for radiological examinations, how to avoid adverse events, and how to react professionally in case of an anaphylactic reaction. Methods of prophylaxis and therapy for anaphylactic and chemotoxic effects of contrast media administration as well as absolute and relative contraindications are discussed. Medico-legal considerations of contrast agent administration, informed consent of patients, and methods of risk management for undesired contrast media reactions are considered in this article. Establishment of administration standards for contrast media is of tremendous importance to standardize radiological procedures. This basic radiological documentation is part of the institutional and individual legal safety management. (orig.) [German] Ziel dieses Artikels ist es, Kenntnisse zur sicheren Anwendung von intravenoes applizierten, jodierten, nichtionischen, nieder- bis isoosmolaren Roentgen-Kontrastmitteln zu vermitteln, um bei deren Verwendung unerwuenschte Wirkungen zu vermeiden oder im Falle eines anaphylaktischen Kontrastmittelzwischenfalls rasch und effektiv zu handeln. Neben Methoden der Verhuetung und Behandlung anaphylaktischer und chemotoxischer Wirkungen der Kontrastmittelgabe werden Einschraenkungen der Anwendung bei unterschiedlichen klinischen Bildern eroertert. Rechtliche Ueberlegungen zur Kontrastmittelanwendung, das Aufklaerungsgespraech und Praeventivmassnahmen zum Risiko-Management unerwuenschter Kontrastmittelwirkungen sind beruecksichtigt. Die Festlegung von Anwendungstandards fuer Kontrastmittel dient der Normierung medizinischen Vorgehens. Eine solche radiologische Basisdokumentation ist teil der institutionellen und individuellen rechtlichen Absicherung. (orig.)

  15. Subpoblaciones neuronales presentes en cultivos primarios de ganglio espinal y su relación con la infección in vitro por virus de rabia

    Directory of Open Access Journals (Sweden)

    Hernán Hurtado

    2000-02-01

    Full Text Available

    El virus de la rabia presenta un fuerte tropismo neuronal y que produce una encefalitis generalmente letal. En un accidente rábico clásico, producido por la mordedura de un animal infectado, el virus es captado por terminaciones nerviosas motoras, autonómicas o sensoriales. Si es captado por estas últimas, el virus se transporta retrógradamente hacia los somas neuronales ubicados en los ganglios espinales y de ahí pasa hasta el Sistema Nervioso Central en donde ejerce su acción patógena. Por este motivo los cultivos de ganglio espinal son un modelo relevante para estudiar la interacción entre el virus de la rabia y las neuronas sensoriales presentes en ellos. En estos cultivos se encuentran dos tipos de células, neuronas y células no neuronales (fibroblastos y células de Schwann. Al inocular los cultivos con virus de rabia cepa CVS (Challenge Virus Standard, a pesar de que las células no neuronales son la mayoría, las que se infectan en mayor proporción son las neuronas, lo que confirma el marcado neurotropismo del virus. Adicionalmente a esto, dentro de la población neuronal, parece existir una subpoblación con mayor susceptibilidad hacia la infección por el virus. Para comprobar esta hipótesis, se caracterizaron las subpoblaciones neuronales presentes en estos cultivos utilizando un criterio morfológico (diámetro neuronal y uno bioquímico (presencia de neuropéptidos como marcadores de subpoblaciones en el ganglio. Se realizó una técnica de doble inmunocitoquímica para virus rábico y los neuropéptidos Sustancia P (SP, Neuropéptido Y (NPY, Galanina (GAL, Péptido Relacionado con el Gen de la Calcitonina (CGRP y Péptido Intestinal Vasoactivo (VIP, que clásicamente se usan para la definición de subpoblaciones. El análisis morfométrico demostró que en nuestros cultivos el 85% de las neuronas presentes son de pequeño diámetro (<25

  16. Recognition of faults patterns in electric generators using artificial neurons networks; Reconocimiento de patrones de fallas en generadores electricos empleando redes neuronales artificiales

    Energy Technology Data Exchange (ETDEWEB)

    Rocha Sanchez, Martha Alicia

    1999-03-01

    This work present the development of a reprocessing method to reduce the information of the original data and to maintain the essential information of the data that enter the reduction process. The obtaining of these data is performed with the aid of the ICM ++ (ICMsystems), from which vectors or n-uplos of elements are obtained. This investigation allowed to analyze an evaluation of the paradigms of artificial neural networks, with the intention of detecting which of these paradigms would evolve better with the problem of fault diagnosis in electric generators. From this a prototype system was developed called diagnosis of faults in electrical generators, which automatically will recognize faults in electrical generators by means of the interpretation of the recording of partial discharges. [Spanish] El presente trabajo presenta el desarrollo de un metodo de reprocesamiento para reducir informacion de los datos originales y mantener la informacion esencial de los datos que entran al proceso de reduccion. La obtencion de estos datos se realiza con la ayuda del ICM ++ (ICMsystems), de los cuales se obtienen vectores o n-uplos de elementos. Esta investigacion permitio analizar una evaluacion de los paradigmas de redes neuronales artificiales, con el objeto de detectar cual de estos paradigmas se desempenaria mejor con el problema de diagnostico de fallas en generadores electricos. A partir de esto se desarrollo un sistema prototipo llamado diagnostico de fallas en generadores electricos, el cual automaticamente reconocera fallas en los generadores electricos mediante la interpretacion de registro de descargas parciales.

  17. El compromiso exportador en Colombia: un análisis de redes neuronales || Export Commitment in Colombia: An Analysis of Neural Networks

    Directory of Open Access Journals (Sweden)

    Escandón Barbosa, Diana Marcela

    2017-12-01

    Full Text Available El compromiso exportador suele ser un aspecto empresarial clave para explicar por qué unas empresas exportan más que otras. En este artículo se analizan los determinantes del compromiso exportador en las pymes colombianas desde el punto de vista comportamental y actitudinal mediante un modelo de redes neuronales estimado sobre una muestra de 306 pymes exportadoras. Los resultados permiten concluir que las pymes colombianas se centran en invertir sus recursos financieros propios para impulsar las exportaciones, y la actitud del empresario al riesgo resulta determinante para asumir la actividad exportadora como estrategia empresarial generadora de mayores rendimientos. || The export commitment is often a key to explain why some firms export more than other business aspect. This article discusses the determinants of export commitment in Colombian SMEs from the behavioral and attitudinal viewpoint using a neural network model estimated on a sample of 306 exporting SMEs. The results suggest that Colombian SMEs focus on investing their own resources to boost exports and employers' behavior risks making decisive for export activity as a business strategy that generates higher returns.

  18. Desarrollo de Experimentos de un Robot Navegador con Redes Neuronales en un Ambiente Estructurado: Programación de Conductas con Algoritmo de Retropropagación

    Directory of Open Access Journals (Sweden)

    Alejandro Hossian

    2015-02-01

    Full Text Available El presente artículo busca comunicar los avances realizados en el análisis y desarrollo de experimentos realizados en computadora para robots navegadores mediante la aplicación de Tecnologías Inteligentes. Para su realización se dispone de software y hardware apropiados a partir de los cuales se diseña un ambiente de navegación con obstáculos definidos en el marco de un entorno industrial. En este contexto, se diseña un ambiente computarizado con el cual el robot interactúa, en el cual se desplaza hasta llegar a un objetivo predeterminado, tratando de no colisionar. Bajo estas premisas y requisitos de usuario, se analiza el desempeño del robot a los efectos de procurar optimizar su performance dentro de este escenario. Para evaluar las potencialidades y limitaciones que presentan las conductas del robot, y en función de la complejidad del ambiente de navegación y de las tareas que éste debe llevar a cabo, se hace uso de las tecnologías de las Redes Neuronales Artificiales (RNA. A tal efecto, una arquitectura de RNA de tipo Backpropagation es la que se utiliza en el presente trabajo.

  19. Alteraciones en la degradación intracelular de proteínas y en la endocitosis en las lipofuscinosis ceroideas neuronales infantil tardía y juvenil

    OpenAIRE

    Vidal Donet, José Manuel

    2014-01-01

    Las lipofuscinosis ceroideas neuronales son un grupo heterogéneo de enfermedades neurodegenerativas hereditarias graves que tienen su inicio en la infancia y que se engloban dentro de las enfermedades de almacenamiento lisosomal. Las características clínicas de estas patologías son una disminución de la capacidad mental acompañada de alteraciones motoras, epilepsia y pérdida de visión. Histológicamente las células muestran una acumulación de material autofluorescente (lipofuscina) en el inte...

  20. Sobre el uso de técnicas chopper para la reducción del ruido flicker en amplificadores para la captación de señales neuronales

    OpenAIRE

    Pérez Prieto, Norberto

    2016-01-01

    La captación de señales neuronales mediante electrodos conectados a circuitos micro-electrónicos es necesaria para aplicaciones clínicas y para el control de prótesis senso-motoras, entre otras muchas aplicaciones bio-médicas. En todas estas aplicaciones, la preservación de la información contenida en las imágenes captadas depende críticamente de las prestaciones de los amplificadores empleados en la cabecera de la cadena de procesamiento electrónica. El problema es que se trata de señales mu...

  1. Opiate addiction : neuronal plasticity on brain reward system and emotional memory-related areas = Adicción a opiáceos : plasticidad neuronal en los circuitos neuronales de recompensa y en áreas de memoria emocional

    OpenAIRE

    García Pérez, Daniel

    2015-01-01

    Los opiáceos, como la morfina, son unos potentes analgésicos que se usan para tratar diversas formas de dolor agudo y crónico. Sin embargo, el uso crónico de opiáceos produce cambios neuroadaptativos a nivel cerebral que conllevan efectos indeseables, como la adicción. La creciente evidencia implica a varios mecanismos de regulación génica (incluyendo epigenéticos, moleculares, celulares y a nivel de circuitos neuronales) en los cambios que las drogas de abuso provocan en el cerebro, siendo e...

  2. able utilizando redes neuronales artificiales; UTILIZATION OF ARTIFICIAL NEURAL NETWORK IN THE SIMULATION AND CONTROL OF WIND TURBINE GENERATORS WITH VARIABLE SPEED AND VARIABLE PITCH.

    Directory of Open Access Journals (Sweden)

    Osley López González

    2011-02-01

    Full Text Available Con el objetivo de aprovechar al máximo la energía del viento y, a la vez, llevar a cabo un control rápido ypreciso de la potencia máxima suministrada al aumentar la misma se han venido utilizando cada vez mássistemas de control capaces de operar en el punto óptimo de entrega de potencia para determinadosvalores de velocidad del viento y limitarla cuando éste supera su valor máximo. Este sistema de control,considerado en su conjunto, debe responder con la exactitud, estabilidad y rapidez necesaria ante lavariabilidad y aleatoriedad del viento. La relación entre sus variables de salida (velocidad de la turbina ypaso de la pala y la de entrada (velocidad del viento que sea capaz de aprovechar la máxima potenciadisponible en el viento en una zona de trabajo y de limitarla en otra, es altamente complicada puesdepende de factores constructivos y de diseño de la turbina y del generador. Esta característica es muydifícil de representar (sea con el objetivo de simulación o con el de control mediante relacionesfuncionales matemáticas convencionales.En este trabajo los autores proponen representar dicha relaciónmediante la utilización de Redes Neuronales Artificiales entrenadas para ser capaces de responderadecuadamente ante cualquier entrada. Basados en los parámetros y características de un aerogeneradorreal de velocidad y paso variables y utilizando el toolbox de Redes Neuronales del MATLAB SIMULINK losautores obtuvieron un modelo neuronal del sistema de control de la velocidad y el paso de la turbinacomprobando su correcta operación ante diferentes perturbaciones de la red eléctrica mediante estemismo lenguaje de simulación. Se demostró que estas redes pueden ser utilizadas con éxito en lasimulación y el control de este tipo de máquinas en cualquier condición de operación. In order to capture the maximum energy from the wind, control systems operating always at an optimumpower has been utilized. This control system

  3. Aplicación de redes neuronales artificiales y técnicas sig para la predicción de coberturas forestales

    Directory of Open Access Journals (Sweden)

    E. Buendía Rodríguez

    2002-01-01

    Full Text Available En México, como en todo el mundo, se tiene la necesidad de realizar un inventario de sus recursos forestales, a fin de llevar a cabo en forma oportuna y adecuada la planeación y la ejecución de programas de manejo forestal. Un método para la obtención de este tipo de información es a través de modelos de predicción. El presente estudio tiene como objetivo evaluar la habilidad de las redes neuronales artificiales (RNA en la predicción de tipos de coberturas forestales. Las RNA desarrolladas en este trabajo se basaron en información geográfica (altitud, exposición, pendiente, distancia a los escurrimientos, geología y edafología e imágenes de satélite haciendo uso del análisis de componentes principales (acp1, acp2 y acp3, para definir la variable dependiente (vegetación. Esta información fue procesada con una RNA de retropropagación (Backpropagation con dos capas ocultas, con sus respectivas funciones de activación (tangencial hiperbólica y gausiana. Obteniendo una r2=0.8617 para la fase de entrenamiento y una r2=0.8514 en la fase de prueba, alcanzando un 83 % de sitios predichos correctamente, sobrepasando lo alcanzado por otros autores con métodos tradicionales.

  4. Comparison of Regression and Neural Networks Models to Estimate Solar Radiation Comparación de Regresión y Modelos de Redes Neuronales para Estimar la Radiación Solar

    Directory of Open Access Journals (Sweden)

    Mónica Bocco

    2010-09-01

    Full Text Available The incident solar radiation on soil is an important variable used in agricultural applications; it is also relevant in hydrology, meteorology and soil physics, among others. To estimate this variable, empirical models have been developed using several parameters and, recently, prognostic and prediction models based on artificial intelligence techniques such as neural networks. The aim of this work was to develop linear models and neural networks, multilayer perceptron, to estimate daily global solar radiation and compare their efficiency in its application to a region of the Province of Salta, Argentina. Relative sunshine duration, maximum and minimum temperature, rainfall, binary rainfall and extraterrestrial solar radiation data for the period 1996-2002, were used. All data were supplied by Experimental Station Salta, Instituto Nacional de Tecnología Agropecuaria (INTA, Argentina. For both, neural networks models and linear regressions, three alternative combinations of meteorological parameters were considered. Good results with both prediction methods were obtained, with root mean square error (RMSE values between 1.99 and 1.66 MJ m-2 d-1 for linear regressions and neural networks, and coefficients of correlation (r² between 0.88 and 0.92, respectively. Even though neural networks and linear regression models can be used to predict the daily global solar radiation appropriately, neural networks produced better estimates.La radiación solar incidente en el suelo es una variable importante usada en aplicaciones agronómicas, además es relevante en hidrología, meteorología y física del suelo, entre otros. Para estimarla se han desarrollado modelos empíricos que utilizan distintos parámetros meteorológicos y, recientemente, modelos de pronóstico y predicción basados en técnicas de inteligencia artificial tales como redes neuronales. El objetivo de este trabajo fue desarrollar modelos lineales y de redes neuronales, del tipo perceptr

  5. MODELACIÓN DE LA ESTRUCTURA JERÁRQUICA DE MACROINVERTEBRADOS BENTÓNICOS A TRAVÉS DE REDES NEURONALES ARTIFICIALES

    Directory of Open Access Journals (Sweden)

    Claudia Rico

    2009-09-01

    Full Text Available El estudio de la estructura jerárquica de comunidades ecológicas, se ha sintetizado de manera regular a través de técnicas multivariadas de ordenación o clasificación. Sin embargo, al contarse actualmente con herramientas analíticas de computación bioinspirada provenientes de la inteligencia artificial, existe la oportunidad de establecer modelos ecológicos, con características deseables como flexibilidad, exactitud, robustez y confiabilidad. En este contexto, esta investigación utilizó dos métodos computacionales de utilidad en ecoinformática, referidos a redes neuronales artificiales (RNARs para la modelación de la estructura jerárquica de una comunidad de macroinvertebrados bentónicos en términos de auto-organización y predicción. El primer método de modelación consistió en un mapa de auto-organización (MAU, una herramienta de aprendizaje no supervisado que clasificó las especies de macroinvertebrados; este MAU tomó en la capa de entrada la abundancia de cada taxa, y en la de salida proyectó su clasificación en 15 unidades y cuatro agrupamientos jerárquicos. La segunda RNA, correspondió a un Perceptrón multicapa de alimentación adelantada con algoritmo de retropropagación, que modeló separadamente la riqueza y la abundancia de Ephemeroptera, Coleoptera y Trichoptera (ECT, en función de nueve variables fisicoquímicas; la arquitectura del perceptrón correspondió a una constitución de nueve, siete, y una neurona en las capas de entrada, intermedia y salida, respectivamente. Los resultados sugieren que las RNARs utilizadas evidenciaron tanto los patrones jerárquicos, como los de riqueza y abundancia de ECT de manera adecuada, al tiempo que facilitaron el análisis de los datos y el entendimiento de la dinámica de la comunidad de macroinvertebrados, objeto de estudio.

  6. Sistema de servocontrol visual empleando redes neuronales y filtros en el dominio de CIELAB//Visual servo-control system using neural networks and filters based on CIELAB

    Directory of Open Access Journals (Sweden)

    Germán Buitrago Salazar

    2015-05-01

    Full Text Available En este trabajo se presentan los resultados de un sistema servocontrol visual de un brazo robótico de seis grados de libertad. Para esto, se utiliza una red neuronal de tipo feed forward, entrenada por back propagation, para determinar la distancia entre el brazo robótico y un objeto de referencia, que permite ubicarlo en un espacio de trabajo. Las entradas de la red corresponden a la información obtenida de las imágenes capturadas por el Kinect, utilizando un filtro que discrimina la posición de los elementos, en el espacio de color CIELAB (Commission Internationale de l'Eclairage L*a*b components. El resultado de esta investigación demostró que la distancia estimada por la red tiene un margen de error menor, que el algoritmo propuesto en otros trabajos. Igualmente, se probó que el sistema de procesamiento de imágenes es más robusto a ruidos digitales, en comparación con los sistemas que utilizan filtros en el dominio RGB (Red-Green-Blue.Palabras claves: sistema de servocontrol visual, CIELAB, redes neuronales, filtrado de imágenes.______________________________________________________________________________AbstractIn this paper the results of visual servo-control system for a robotic arm with six degrees of freedom are presented. For this purpose, a feed fordward neural network, which was trained by back propagation, is used to determine the distance between the robot arm and a reference object and sitting the robot in the workspace. The inputs of neural network correspond to the information obtained from the images captured by the Kinect, using a filter that discriminates the position of the elements in the CIELAB (Commission Internationale de l'Eclairage L*a*bcomponents color space. The result of this research showed that the estimated distance with the network has an errorless than the algorithm proposed in other works. Similarly, it was proved that the image processing system is more robust to digital noise, compared to

  7. ¿Cómo estás atención? Cuáles son y cómo se evalúan las redes neuronales de la atención

    Directory of Open Access Journals (Sweden)

    Fernando Gabriel Luna

    2016-01-01

    Full Text Available Nuestro sistema cognitivo cuenta con redes neuronales que desarrollan diferentes funciones atencionales para afrontar la complejidad estimular del medio ambiente y adaptar nuestro comportamiento a la naturaleza y exigencia de múltiples situaciones. Las redes de la atención conforman un sistema de estructuras cerebrales específicas conectadas y sincronizadas entre sí que nos permiten orientarnos, alertarnos ante algunas señales, sostener nuestra atención, y seleccionar y controlar ciertos estímulos. A continuación se describe la estructura de estas redes, cómo operan en diversas situaciones, y cómo es posible obtener una medida confiable del rendimiento de cada una de las funciones atencionales.

  8. Elaboración de un modelo evolutivo híbrido de algoritmos genéticos y redes neuronales artificiales para dosificaciones de mezclas de concreto reforzadas con fibras metálicas

    Directory of Open Access Journals (Sweden)

    Luis Octavio González Salcedo

    2016-06-01

    Full Text Available En un ambiente computacional, un modelo evolutivo es desarrollado para proponer dosificaciones de mezclas de concretos reforzados con fibras metálicas, para solicitudes de resistencia a la compresión. El modelo es híbrido al incluir un sistema de dosificación basado en algoritmos genéticos y un sistema de estimación de propiedades basado en redes neuronales artificiales. Los resultados obtenidos son comparados con un sistema de dosificaciones reportado experimentalmente. Estas comparaciones muestran una aproximación en el proceso de simulación. Además, por las características del modelo, se considera de aporte en la tecnología del concreto.

  9. Modelo no lineal basado en redes neuronales de unidades producto para clasificación. Una aplicación a la determinación del riesgo en tarjetas de crédito||Non-linear model for classification based on product-unit neural networks. An application to determine credit card risk

    Directory of Open Access Journals (Sweden)

    Martínez-Estudillo, F. J.

    2007-01-01

    Full Text Available El principal objetivo de este trabajo es mostrar un tipo de redes neuronales denominadas redes neuronales basadas en unidades producto (RNUP como un modelo no lineal que puede ser utilizado para la resolución de problemas de clasificación en aprendizaje. Proponemos un método evolutivo en el que simultáneamente se diseña la estructura de la red y se calculan los correspondientes pesos. La metodología que presentamos se basa, por tanto, en la combinación del modelo no lineal RNUP y del algoritmo evolutivo; se aplica a la resolución de un problema de clasificación de índole económica, surgido del mundo de las finanzas. Para evaluar el rendimiento de los modelos de clasificación obtenidos, comparamos nuestra propuesta con varias técnicas clásicas, como la regresión logística o el análisis discriminante, y con el clásico modelo de perceptrón multicapa de redes neuronales basado en unidades sigmoides y el algoritmo de aprendizaje de retropropagación (MLPBP.

  10. PEM-fuel cells for mobile application. Sub task: development of electrocatalysts. Final report; PEM-Brennstoffzelle fuer mobile Anwendung. Teilprojekt: Katalysatorenentwicklung. Abschlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Starz, K A

    1999-01-01

    PEM fuel cells are gaining increasing importance for use in automotive application. The goal of the research program reported here was to develop the basic technology and components for PEMFC stacks for use in transport applications. The sub-task of Degussa was to develop improved electrocatalysts for PEMFC single cells and stacks. The technical objectives of the research project were met. Electrocatalysts, characterized by a high Pt-dispersion, high surface area and excellent activity, were developed. With this material, considerable progress was made to reduce the total platinum loading of PEMFC cells and stacks to about 0,5 mgPt/cm{sup 2}. With this value, the goal of the program (<0,8 mg/cm{sup 2}) was significantly surpassed. Additionally, higher power densities of >0.4 W/cm{sup 2} were achieved at Degussa for hydrogen/air and reformate/air operation of the PEMFC. A CO-tolerant anode electrocatalyst, exhibiting a CO-tolerance of up to 100 ppm CO, enables the operation of PEMFC stacks with on-board generated methanol reformate. The performance of the new electrocatalyst materials was verified by DaimlerChrysler in a PEMFC demonstration stack at the end of the program. (orig.) [Deutsch] PEM-Brennstoffzellen gewinnen fuer die mobile Anwendung immer mehr an Bedeutung. Im Rahmen des hier beschriebenen Leitprojektes sollten die Basistechnologien fuer den Einsatz der PEM-Brennstoffzelle im mobilen Bereich (Elektrotraktion) entwickelt werden. Das Teilprojekt der Degussa befasst sich mit der Entwicklung von verbesserten Elektrokatalysatoren fuer PEM-Brennstoffzellenstacks. Die technischen Arbeitsziele des Vorhabens wurden erreicht. So konnten Elektrokatalysatoren bereitgestellt werden, die sich durch eine hohe Pt-Dispersion, eine grosse Pt-Oberflaeche sowie eine sehr gute Aktivitaet auszeichnen. Mit diesen Elektrokatalysatoren gelang es, die Platinbeladung der PEM-Elektroden (Anode und Kathode) erheblich abzusenken. Mit einer Gesamtplatinbeladung von 0,5 mg/cm{sup 2

  11. MR implant labelling and its use in clinical MRI practice; MR-Implantatkennzeichnungen und ihre Anwendung in der klinischen MRT-Praxis

    Energy Technology Data Exchange (ETDEWEB)

    Muehlenweg, M. [Krankenhaus Martha-Maria Halle-Doelau, Institut fuer Radiologie, Halle (Saale) (Germany); Schaefers, G. [MR:comp GmbH, Gelsenkirchen (Germany)

    2015-08-15

    Messungen von Patienten mit Implantaten. In juengerer Vergangenheit ist jedoch ein Weg geschaffen worden, diese Kontraindikation legal zu umgehen. Hierfuer sind spezielle Voraussetzungen noetig: Eindeutige Implantatidentifikation und Vorlage der originalen Herstellerkennzeichnung, Gewaehrleistung der geforderten Bedingungen bei ''bedingt MR-sicheren'' Implantaten und Restrisiko-Nutzen-Analyse mit entsprechender Aufklaerung. Dieser Prozess ist u. U. sehr aufwendig, da die Implantate haeufig schlecht dokumentiert und die Detailinformationen der Implantatkennzeichnung ebenfalls nicht selten veraltet oder nicht einfach zu interpretieren sind. Diese Arbeit informiert ueber rechtliche und normative Grundlagen der Messung von Patienten mit Implantaten. Es werden kurz moegliche physikalische Wechselwirkungen mit Implantaten angerissen, moegliche Strategien zur besseren Identifikation und Recherche von Implantaten und ihrer MR-Kennzeichnung aufgezeigt und allgemeine Ansaetze zur Risikominimierung an Beispielen diskutiert. Der zweite Teil geht auf die Inhalte von MR-Implantatkennzeichnungen ein und zeigt die aktuellen Pruefstandards auf. Es werden die fuer die Interpretation von MR-Implantatkennzeichnungen notwendigen Zusatzinformationen aus den Betriebsanleitungen der MR-Scanner erlaeutert. Abschliessend folgen die Erklaerung der aktuellen Muster-MR-Kennzeichnung von Implantaten der FDA (US Food and Drug Administration) und eine exemplarische Anwendung. (orig.)

  12. An application of neural network in geophysical prospecting. Electrical resistivity at Las Virgenes geothermal field, Baja California Sur, Mexico; Una aplicacion de las redes neuronales a la prospeccion geofisica. Resistividad electrica en las Tres Virgenes, Baja California Sur, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Palma Guzman, Sergio Hugo [Comision Federal de Electricidad, Morelia, Michoacan (Mexico)

    2000-12-01

    The technology of the neural network is presented with geophysical focus in the Las Virgenes geothermal field, Baja California Sur, Mexico. The results obtained when extrapolating the associative data of the prospecting magnetoteluria and Vertical Electric Sounding, on the area of the geothermal wells to the rest of the area, allows to classify zones of interest for the geothermal exploitation. Also, the use of these associative parameters with the information of the stabilized temperature of the wells, they allow to predict temperatures for the rest of the area. [Spanish] Se presenta una aplicacion de la tecnologia de las redes neuronales con enfoque geofisico en el campo geotermico de Las Virgenes, Baja California Sur, Mexico. Los resultados obtenidos al extrapolar los datos asociativos de las prospecciones geoelectricas de magnetoteluria y sondeos electricos verticales, en la zona de los pozos geotermicos al resto del area, permiten clasificar zonas de interes para la explotacion geotermica. Tambien, la utilizacion de estos parametros asociativos con la informacion de la temperatura estabilizada de los pozos, permiten predecir temperaturas para la misma area.

  13. Prediction of the daily share price fluctuations of SURAMINV. A neural netword model Predicción del comportamiento diario de la acción de SURAMINV. Un modelo de redes neuronales

    Directory of Open Access Journals (Sweden)

    Jaime Enrique Arrieta Bechara

    2009-12-01

    Full Text Available As opposed to the weak form of efficient-market hypothesis, the current study shows that it is possible to do good predictions about the daily share price fluctuations of Suraminv, using artificial neural network models. Furthermore, the forecasts obtained are used to analyze the possibility of gaining extraordinary returns with regard to the Buy & Hold strategy, through negotiation systems with basic rules.La investigación muestra que es posible realizar, por medio de modelos de redes neuronales artificiales, buenas predicciones sobre el comportamiento diario de la acción de SURAMINV. Tales resultados contrarían la hipótesis de la teoría de eficiencia débil de mercado. A partir de dichas predicciones y con el uso de sistemas de negociación, se evalúa la posibilidad de obtener rendimientos extraordinarios sobre la estrategia Buy & Hold teniendo en cuenta costos de transacción y oportunidad.

  14. Diseño de redes neuronales con aprendizaje combinado de retropropagación y búsqueda aleatoria progresiva aplicado a la determinación de austenita retenida en aceros TRIP

    Directory of Open Access Journals (Sweden)

    Capdevila, C.

    2010-12-01

    Full Text Available At the beginning of the decade of the nineties, the industrial interest for TRIP steels leads to a significant increase of the investigation and application in this field. In this work, the flexibility of neural networks for the modelling of complex properties is used to tackle the problem of determining the retained austenite content in TRIP-steel. Applying a combination of two learning algorithms (backpropagation and creeping-random-search for the neural network, a model has been created that enables the prediction of retained austenite in low-Si / low-Al multiphase steels as a function of processing parameters.

    A partir de los años noventa, el interés que los aceros TRIP despiertan en la industria ha producido un incremento considerable de su estudio y aplicación. En este trabajo, aprovechando la flexibilidad que las redes neuronales proporcionan para la modelización de propiedades complejas, se ha abordado el problema de la determinación de la austenita retenida en los aceros TRIP. Una combinación de dos algoritmos de aprendizaje (retropropagación y búsqueda aleatoria progresiva de la red neuronal ha permitido crear un modelo que predice la cantidad de austenita retenida en aceros multifase con bajo contenido en aluminio y silicio en función de los parámetros de procesado.

  15. Neural correlates of working memory deficits in schizophrenic patients. Ways to establish neurocognitive endophenotypes of psychiatric disorders; Neuronale Korrelate gestoerter Arbeitsgedaechtnisfunktionen bei schizophrenen Patienten. Ansaetze zur Etablierung neurokognitiver Endophaenotypen psychiatrischer Erkrankungen

    Energy Technology Data Exchange (ETDEWEB)

    Gruber, O. [Universitaet des Saarlandes, Klinik fuer Psychiatrie und Psychotherapie, Homburg (Saar) (Germany); Max-Planck-Institut fuer Kognitions- und Neurowissenschaften, Leipzig (Germany); Gruber, E.; Falkai, P. [Universitaet des Saarlandes, Klinik fuer Psychiatrie und Psychotherapie, Homburg (Saar) (Germany)

    2005-02-01

    This article briefly reviews some methodological limitations of functional neuroimaging studies in psychiatric patients. We argue that the investigation of the neural substrates of cognitive deficits in psychiatric disorders requires a combination of functional neuroimaging studies in healthy subjects with corresponding behavioral experiments in patients. In order to exemplify this methodological approach we review recent findings regarding the functional neuroanatomy of distinct components of human working memory and provide evidence for selective dysfunctions of cortical networks that underlie specific working memory deficits in schizophrenia. This identification of subgroups of schizophrenic patients according to neurocognitive parameters may facilitate the establishment of behavioral and neurophysiological endophenotypes and the development of a neurobiological classification of psychiatric disorders. (orig.) [German] Dieser Beitrag befasst sich mit einigen methodischen Problemen funktionell-bildgebender Studien mit psychiatrischen Patienten, aufgrund derer die Untersuchung der neuronalen Korrelate kognitiver Defizite bei psychiatrischen Erkrankungen einer Kombination funktionell-bildgebender Studien bei gesunden Normalprobanden mit Verhaltensuntersuchungen bei Patienten bedarf. Dieser methodische Ansatz wird am Beispiel von Arbeitsgedaechtnisfunktionen erlaeutert, wobei zunaechst neuere Erkenntnisse zur funktionellen Neuroanatomie verschiedener Komponenten des menschlichen Arbeitsgedaechtnisses referiert werden. Anschliessend werden bei schizophrenen Patienten erhobene Befunde vorgestellt, die auf spezifische Stoerungen der funktionellen Integritaet neuronaler Netzwerke mit Arbeitsgedaechtnisfunktionen hinweisen. Die damit verbundene Identifikation von Subgruppen schizophrener Patienten koennte zur Etablierung verhaltensneurophysiologisch definierter Endophaenotypen psychiatrischer Stoerungsbilder fuehren und die Entwicklung einer neurowissenschaftlich

  16. Handbuch Stahl Auswahl, Verarbeitung, Anwendung

    CERN Document Server

    Bleck, Wolfgang

    2018-01-01

    Stahl ist der wichtigste Konstruktionswerkstoff. Im Maschinen- und Anlagenbau, Fahrzeugbau, Schiffbau, Stahlbau und in vielen anderen Industriebereichen ist er durch keinen anderen Werkstoff zu ersetzen. Für jeden Anwendungszweck gibt es passende Stahlsorten am Markt zu kaufen. Die Feinabstimmung der gewünschten Eigenschaften kann im weiteren Verarbeitungsprozess vorgenommen werden, bis der Werkstoff optimal den gewünschten Produktanforderungen entspricht. Die Anzahl der Möglichkeiten ist sehr groß und somit auch die Schwierigkeit, den genau passenden Stahl zu finden bzw. zu erzeugen. Das vorliegende Handbuch hilft Ihnen, dieses Problem zu lösen. Es zeigt u.a. - mit welchen systematischen Ansätzen und Hilfsmitteln Sie die in Frage kommende Stahlsorte eingrenzen können - die wichtigsten produktrelevanten Eigenschaften und Lieferformen - die werkstoffgerechte Weiterverarbeitung durch umformende und spanende Fertigungsprozesse und Wärmebehandlung - hunderte Anwendungsbeispiele aus Maschinen- und Anlage...

  17. Application of radioactive substances in research in nuclear medicine: current trends and radiation exposure to the study subjects; Anwendung radioaktiver Stoffe in der nuklearmedizinischen Forschung: aktuelle Trends und Strahlenexposition der Probanden

    Energy Technology Data Exchange (ETDEWEB)

    Minkov, V.; Schwarz, E.R.; Bauer, B.; Nosske, D.; Erzberger, A.; Brix, G. [Bundesamt fuer Strahlenschutz, Inst. fuer Strahlenhygiene, Abt. fuer Medizinische Strahlenhygiene, Neuherberg (Germany)

    2001-08-01

    the studies showed, for the period of evaluation, an overall trend towards reduction. (orig.) [German] Ziel: Im Rahmen dieser Studie wurde die Anwendung radioaktiver Stoffe am Menschen in der nuklearmedizinischen Forschung und die damit fuer die Probanden verbundene Strahlenexposition analysiert. Methodik: Hierzu wurden die zwischen 1997 und 1999 vom Bundesamt fuer Strahlenschutz zusammen mit dem Bundesinstitut fuer Arzneimittel und Medizinprodukte begutachteten Antraege nach paragraph 41 Strahlenschutzverordnung ausgewertet. Ergebnisse: Der Schwerpunkt der begutachteten Studien zur diagnostischen Anwendung radioaktiver Stoffe hat sich seit 1998 von onkologischen auf neurologisch/psychiatrische Fragestellungen verlagert, wobei die Anzahl der PET-Studien stetig zunahm. Der Anteil der in diagnostische Studien einbezogenen gesunden Probanden ist von 7 auf 22% angestiegen. Therapeutische Anwendungen radioaktiver Stoffe nahmen seit 1997 um das Dreifache zu, wobei der Schwerpunkt im Bereich der Radioimmuntherapie und der endovaskulaeren Brachytherapie lag. Fuer bis zu 49% der untersuchten gesunden Probanden war die effektive Dosis hoeher als 5 mSv, fuer bis zu 6% dieser Probanden lag sie ueber 20 mSv. Bis zu 22% der Patienten erhielten im Rahmen diagnostischer Studien eine effektive Dosis von 20-50 mSv. Eine Ueberschreitung der 50-mSv-Grenze trat bei bis zu 3% der Patienten auf. Schlussfolgerungen: Trotz zunehmender Anwendung der PET behaelt die konventionelle Nuklearmedizin ihre Bedeutung in der medizinischen Forschung. Weiterentwicklungen auf dem Gebiet der Radiochemie und Molekularbiologie fuehrten zu einer zunehmenden Bedeutung der Radioimmuntherapie. Die Evaluierung neuer Radiopharmaka und die Erweiterung der biomedizinischen Grundlagenforschung resultierte in einem Anstieg des Anteils der in die Studien einbezogenen gesunden Probanden. Die studienbedingte Strahlenexposition der Probanden zeigte fuer den ausgewerteten Zeitraum insgesamt einen ruecklaeufigen Trend

  18. PRONÓSTICO DE VENTAS: COMPARACIÓN DE PREDICCIÓN ENTRE REDES NEURONALES Y MÉTODO ESTADÍSTICO

    Directory of Open Access Journals (Sweden)

    S. Nojek

    2003-05-01

    -family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;}

    RESUMEN

    Actualmente es común que las empresas realicen pronósticos de ventas para poder planificar más acertadamente su producción. El objetivo de este trabajo consiste en estudiar la predicción de ventas mediante el uso de redes neuronales, comparar los resultados obtenidos con los pronósticos de un método estadístico clásico y establecer los entornos más adecuados para su uso.

    Palabras Clave: Pronostico de Ventas – Predicción basada en Redes Neuronales.

     

    ABSTRACT

    Companies usually need sales forecast for improving production planning. This research work pursues to study sales forecast based on neural networks and to compare this results with the ones based on classical statistical methods trying to specify the adequate business environment for using them

    Keywords: Sales Forecast – Forecasting based on Neural Networks

  19. Aplicación de análisis de conglomerados y redes neuronales artificiales para la clasificación y selección de candidatos a residencias médicas

    Directory of Open Access Journals (Sweden)

    Raúl A. Borracci

    Full Text Available Introducción: Los programas educacionales han recurrido a distintos modelos de regresión lineal múltiple, de selección asistida por computadora y más recientemente, de redes neuronales artificiales para la confección de listados preliminares de mérito entre los postulantes a la residencia. Objetivo: evaluar y rediseñar un sistema para la selección y clasificación de aspirantes a un programa de residencias universitarias por medio de la aplicación de modelos de análisis multivariante y de redes neuronales artificiales. Material y Método: El diseño consistió en un estudio retrospectivo-transversal, realizado en un hospital universitario. Se evaluó una muestra al azar de 213 aspirantes a un programa de residencias médicas universitarias teniendo en cuenta el promedio de la carrera de grado, el resultado del examen de ingreso a la residencia, los antecedentes curriculares y biográficos, el internado y el puntaje de las entrevistas. Se aplicó un análisis de conglomerados jerárquico (clúster análisis para la clasificación y selección de los candidatos en un orden de mérito en base a los puntajes estandarizados de las 5 variables. Resultados: El análisis de conglomerados jerárquico clasificó 209 aspirantes en 12 conglomerados en base al promedio estandarizado de los valores obtenidos de las 5 variables. Este análisis se usó para construir una clasificación descriptiva de los grupos y una lista final por mérito de acuerdo a la posición relativa de cada candidato por encima o debajo de los puntajes promedios. Se imitó la solución de conglomerados por medio de una red perceptrón multicapa con una sensibilidad y especificidad de 94.1 y 99.1% respectivamente. Conclusiones: El análisis de conglomerados jerárquico fue un método útil y novedoso para clasificar una muestra de aspirantes a la residencia en conglomerados de acuerdo a la posición relativa de sus puntajes estandarizados por encima o por debajo de la media

  20. Predicción por redes neuronales artificiales de la calidad fisicoquímica de vinagre de melaza de caña por efecto de tiempo-temperatura de alimentación a evaporador-destilador flash

    Directory of Open Access Journals (Sweden)

    Víctor Vásquez V.

    2010-01-01

    Full Text Available Se predijo por Redes Neuronales Artificiales (RNA importantes características fisicoquímicas de vinagre de melaza: pH, densidad, acidez total, etanol, aldehídos totales y furfural; obtenidas mediante operaciones de evaporación flash y clarificación por destilación flash. Melaza fermentada por vía alcohólica y acética, fue alimentada a un evaporador flash a cuatro temperaturas (61, 66, 71 y 76 °C y tres tiempos (25, 35 y 45 min. La predicción se realizó con dos redes: RNA-A y RNA-B, ambas con buen desempeño. La RNA-A fue del tipo feedforward (FF, con algoritmos de entrenamiento Backpropagation (BP y ajuste de pesos Levenberg-Marquardt (LM, topología: 6 entradas (datos de las operaciones de evaporación-destilación flash, 7 salidas lineales (características fisicoquímicas, 9 neuronas tangente sigmoidales en 1 capa oculta, coeficiente de momento 0.5, tasa de aprendizaje 0.01, meta del error 0.0001 y 20 etapas de entrenamiento. La RNA-A mostró mejor desempeño que un modelo estadístico de primer orden. La RNA-B igualmente FF, con algoritmos BP y LM, topología: 2 entradas (datos de la evaporación flash, 7 salidas lineales (características fisicoquímicas, 84 neuronas logaritmo sigmoidales en 1 capa oculta, coeficiente de momento 0.5, tasa de aprendizaje 0.01, meta del error 0.0001 y 300 etapas de entrenamiento. La RNA-B mostró igual capacidad predictiva que un modelo estadístico de primer orden con interacción de términos.

  1. Modelamiento matemático y por redes neuronales artificiales del crecimiento de Spirulina sp. en fotobiorreactor con fuente de luz fluorescente e iluminación en estado sólido

    Directory of Open Access Journals (Sweden)

    Víctor Vásquez-Villalobos

    2013-01-01

    Full Text Available Se evaluaron los modelos matemáticos de Gompertz y logístico en la cinética de crecimiento de Spirulina sp., los cuales fueron comparados con un modelamiento por Redes Neuronales Artificiales Backpropagation (RNA-BP. La Spirulina fue cultivada en un fotobiorreactor de laboratorio aireado (3 L/min de 500 mL, con iluminación fluorescente de 40W y en Estado Sólido (LED-Light Emitting Diode de 1W; obteniendo con ambos sistemas 11,0 klx. La iluminación LED, permitió obtener un valor elevado de biomasa (ɑ de 0,90 , en comparación con la obtenida con iluminación fluorescente de 0,82; así como una mayor velocidad de crecimiento μ=0,63 h-1, precedida de un menor tiempo de latencia λ=0,34 h. La RNA-BP mostró buena precisión con respecto al modelo corregido de Gompertz I, tanto para el caso del cultivo de Spirulina sp. con iluminación fluorescente y con LED, mostrando coeficientes de correlación (R del orden de 0,993 y 0,994 respectivamente, con respecto a los datos experimentales. Resulta ventajoso el modelamiento a través del modelo corregido de Gompertz I, porque además de valores de R de 0,987 y 0,990 en los cultivos de Spirulina sp. Con iluminación fluorescente y con LED respectivamente, permite obtener los parámetros de la cinética de crecimiento de manera directa.

  2. Predicción del color y contenido de humedad en café cerezo mediante redes neuronales y regresión de mínimos cuadrados parciales

    Directory of Open Access Journals (Sweden)

    Wilson Manuel Castro Silupu

    2015-12-01

    Full Text Available La presente investigación se enfocó en el desarrollo de modelos de predicción del color en coordenadas CIELab y el contenido de humedad de café cerezo mediante la tecnología de imágenes hiperespectrales; comparando el ajuste por un modelo de regresión lineal múltiple – PLSR (Partialleastsquareregression y un modelo no lineal (ANN – artiftial neural network. La muestra se conformó de 200 granos de café cerezo en diferentes estados de madurez, dividiéndola en 120 granos para calibración y 80 de validación.La  muestra fue caracterizada mediante colorimetría en el espacio CIELab y determinación de la humedad. Posteriormente se adquirieron imágenes hiperespectrales de cada granos y se almacenaron en formato *.bil. El procesamiento de las imágenes se realizó mediante un sistema desarrollado e implementado en el software matemático Matlab 2010a, mediante funciones *.m e interfaces de usuario (GUIs. Se desarrollaron modelos de ajuste para cada una de las coordenadas de color y el contenido de humedad, calculándose los coeficientes de correlación en calibración y validación. Los resultados mostraron que las redes neuronales tienen un mayor ajuste en calibración con coeficientes de correlación superiores a 0,90 mientras que el PLSR genero coeficientes entre 0,42 y 0,48.

  3. Utilización de redes neuronales para la determinación de respuestas de sitio a partir de Ondas coda Aplicación para Armenia Colombia

    Directory of Open Access Journals (Sweden)

    Vargas Jiménez Carlos A.

    2001-08-01

    neuronales facilitan el proceso de deducción de funciones de transferencia lineales y no lineales orientadas a la evaluación dinámica de suelos.

  4. Orientation of a 3D object: implementation with an artificial neural network using a programmable logic device;Orientacion de un objeto 3D : implementacion de redes neuronales artificiales utilizando logica programable

    Energy Technology Data Exchange (ETDEWEB)

    Carnevale, Federico J [Universidad Nacional de Cuyo, Instituto Balseiro, Centro Atomico Bariloche (Argentina)

    2010-07-01

    Complex information extraction from images is a key skill of intelligent machines, with wide application in automated systems, robotic manipulation and human-computer interaction. However, solving this problem with traditional, geometric or analytical, strategies is extremely difficult. Therefore, an approach based on learning from examples seems to be more appropriate. This thesis addresses the problem of 3D orientation, aiming to estimate the angular coordinates of a known object from an image shot from any direction. We describe a system based on artificial neural networks to solve this problem in real time. The implementation is performed using a programmable logic device. The digital system described in this paper has the ability to estimate two rotational coordinates of a 3D known object, in ranges from -80{sup 0} to 80{sup 0}. The operation speed allows a real time performance at video rate. The system accuracy can be successively increased by increasing the size of the artificial neural network and using a larger number of training examples;La extraccion de informacion compleja a partir de imagenes es una habilidad clave en las maquinas inteligentes con vasta aplicacion en los sistemas automatizados, la manipulacion robotica y la interaccion humano-computadora. Sin embargo, resulta una tarea extremadamente dificil de resolver con estrategias clasicas, geometricas o analiticas. Por lo tanto, un enfoque basado en aprendizaje a partir de ejemplos parece mas adecuado. Esta tesis trata acerca del problema de orientacion 3D, cuyo objetivo consiste en estimar las coordenadas angulares de un objeto conocido, a partir de una imagen tomada desde cualquier direccion. Se describe un sistema, basado en redes neuronales artificiales, para resolver este problema en tiempo real. La implementacion, capaz de funcionar a frecuencia de video, se realiza utilizando un dispositivo de logica programable. El sistema digital final demuestra la capacidad de estimar dos coordenadas

  5. Análisis de sistema de potencia desbalanceado con el empleo de herramientas estadísticas, coeficientes complejos y redes neuronales artificiales; Statistical, Complex Factor and Neural Networks Analysis and Simulation of an Unbalance Power Systems

    Directory of Open Access Journals (Sweden)

    Marcos A de Armas Teyra

    2011-02-01

    Full Text Available Se caracteriza estadísticamente el desbalance de tensión en un sistema eléctrico de potencia en términos de laIEEE y se señalan algunas informaciones útiles adicionales que se obtienen de esta. Se muestra cuán sostenidapuede ser la explotación de un conjunto de potentes motores asincrónicos fuera de las normas internacionaleshaciéndose énfasis en aspectos energéticos al determinar la potencia demandada y la energía adicional consumidadebido a la asimetría. Por último, se presenta una red neuronal cuya función es determinar el desbalance, emitirseñales de alarma y producir el disparo del sistema si fuese necesario. Para este propósito se utilizan no solo lastensiones de fase, sino las corrientes de línea y los coeficientes complejos de desbalance. Se concluye con queel desbalance es un problema energético que produce demandas y pérdidas que pueden ser cuantificadas por elcoeficiente de asimetría y el análisis estadístico. Las redes neuronales pueden ser entrenadas para ofreceralarma, protección y otras tareas en los sistemas eléctricos de potencia. También pueden ser incorporadas a lossistemas modernos de mediciones digitalizadas en los servicios industriales. Para la validación de los resultados,se emplean las mediciones recién efectuadas en una estación de bombeo del acueducto de la provincia deCienfuegos, Cuba.  There are tree goals in this article; statistical characterization of an unbalanced power system, show how longan asynchronous group of motors can be exploited out of international unbalance standards focused on powerdemand and energy consumption due to asymmetry complex defined factor and to present an artificial neuralnetwork used to send warning signals or to protect the motors under abnormal unbalanced conditions. As a case,a water supply station in Cienfuegos`s province is presented.sequence and the possibilities that this designpresents for the increase of the security of the installationI.

  6. Intensidad exportadora e interacción entre fortalezas del marketing mix: un análisis basado en redes neuronales artificiales || Export Intensity and Interaction between Marketing Mix: An Analysis based on Artificial Neural Networks

    Directory of Open Access Journals (Sweden)

    Gutiérrez-Villar, Belén

    2014-12-01

    Full Text Available Entre los factores determinantes de la actuación exportadora de las empresas, numerosos estudios han subrayado la relevancia del mix de marketing. Generalmente, la mayoría de los estudios abordan el análisis de las variables centrado en estrategias específicas, en particular fenómenos de estandarización-adaptación. El presente estudio analiza si existe un efecto interactivo de fortalezas generadas en las diferentes variables del mix de marketing que pueda asociarse a diferentes perfiles exportadores. Para ello, se ha empleado el algoritmo Extreme Learning Machine (ELM dentro de los procedimientos Perceptrón Multicapa (MLP de Redes Neuronales Artificiales (RNA. Asimismo, el análisis se combina con un novedoso procedimiento de análisis de sensibilidad desarrollado ad hoc para este estudio, el cual permite conocer los efectos individuales e interactivos de las variables predictoras sobre la variable dependiente en problemas clasificatorios de naturaleza dicotómica. Los resultados obtenidos nos permiten corroborar la existencia de los efectos interactivos postulados, poniendo al mismo tiempo de manifiesto la utilidad de las RNA y del análisis de sensibilidad propuesto para la investigación en el área de marketing y, específicamente, para los estudios de internacionalización de empresas. || Among the determining factors in export activity, many studies have highlighted the relevance of the marketing mix. Generally, the majority of them use a variables analysis to focus on specific strategies, in particular, standardized-adaptations. This paper analyzes if there is an interactive effect of strength generated in different variables of the marketing mix that can be associated with different export profiles. The Extreme Learning Machine (ELM algorithm has been used within the Multilayer Perceptron (MLP of Artificial Neural Networks (ANN. In addition, the analyses combine a novel approach for sensitivity analysis developed ad hoc for this

  7. Environmental protection by cost minimization: Least Cost Planning for traffic. Includes a guide for the application in local communities; Umweltentlastung durch Kostenminimierung: Least Cost Planning im Verkehr. Mit Leitfaden fuer die Anwendung in Kommunen

    Energy Technology Data Exchange (ETDEWEB)

    Bracher, T.; Diegmann, V.; Eckart, C.F.; Liwicki, M.; Lobenberg, G.; Wetzel, C. [Gesellschaft fuer Informatik, Verkehrs- und Umweltplanung mbH (IVU), Berlin (Germany); Bergmann, M.; Uricher, A.; Lueers, A. [Oeko-Institut, Inst. fuer Angewandte Oekologie e.V., Freiburg im Breisgau (Germany); Becker, U.; Karl, G.; Karl, B.; Voellings, A. [Technische Univ. Dresden (Germany). Lehrstuhl fuer Verkehrsoekologie

    1999-08-01

    den Energiesektor entwickelte Least Cost Planning zu uebertragen. Auf der Basis einer Analyse der in der Literatur dokumentierten Ansaetze und der vorhandenen Bewertungsverfahren fuer oeffentliche Massnahmen wurden Anforderungen an Methodik und Entwicklung eines verbesserten Bewertungsverfahrens formuliert. Dieses muss verkehrsmitteluebergreifend (intermodal) und verkehrsuebergreifend (integriert) sein. Das entwickelte Verfahren ermoeglicht erstens die Darstellung der Verkehrsausgaben und Einnahmen einer Stadt im Jahresueberblick, und zweitens die vergleichende Bewertung von Planungsvarianten. Dies wurde anhand verschiedener Varianten fuer die Erschliessung eines Gewerbegebiets im Norden Freiburgs illustriert. Dabei wurden drei Varianten untersucht: die Verlaengerung einer Stadtbahnstrecke, die Verdichtung des Busverkehrsnetzes und die Einrichtung von Service-Stationen und weitere Foerdermassnahmen fuer den Fahrradverkehr. Neben den Berechnungen von Einnahmen und Ausgaben fuer jede Variante wurde eine uebersichtliche Darstellung von Auswirkungen auf die Verkehrsnachfrage, die Belastung mit Luftschadstoffen und Laerm sowie den Flaechenverbrauch entwickelt. Im Ergebnis schneidet die Erschliessung mit dem Fahrrad tendenziell guenstig ab. Der Abschlussbericht umfasst drei Baende sowie einen Leitfaden zur Anwendung des Verfahrens in Kommunen. Dazu gehoert ein Satz Tabellen im Excel Format, der die leichte Anwendung ermoeglicht. (orig.)

  8. Screening of additives for the production of ice pulp for application in normal cooling and freezing; Screening von Zusatzstoffen zur Herstellung von Eisbrei fuer die NK-/TK-Anwendung

    Energy Technology Data Exchange (ETDEWEB)

    Ruebeling, Jascha; Eiseler, Jens [Hochschule Karlsruhe - Technik und Wirtschaft (Germany). Inst. fuer Kaelte-, Klima- und Umwelttechnik

    2011-07-01

    The project investigated non-toxic additives for production of ice slurry. Ice slurry is an environment-friendly refrigerant that is increasingly used as a substitute for conventional refrigerants. In view of rising energy prices and an impending tax on climate-relevant refrigerants, ice slurry may soon be used for chilling of food in supermarkets. For this, ice slurry of about 0 C is required for normal cooling and of about -25 C for deep freezing. A very fine-grained, pumpable ice slurry is obtained with glucose as an additive, or with sodium chloride in eutectic concentration with small amounts of ethanol for deep freezing. Ethanol will refine the coarse crystal structure of the eutectic sodium chloride / water mixture and will also reduce the freezing point. Further, the method of primary crystallisation on a crystallised additive was developed. An industrial plant working by this principle will have less disturbances and wear during ice slurry production. [German] Die Projektarbeit befasste sich mit der Untersuchung lebensmittelvertraeglicher Additive zur Herstellung von Eisbrei. Eisbrei gilt als umweltfreundlicher Kaeltetraeger, der zunehmend in verschiedenen Bereichen zur Anwendung kommt und herkoemmliche Kaeltemittel ersetzen kann. Aufgrund steigender Energiekosten sowie einer eventuell anstehenden Besteuerung treibhauswirksamer Kaeltemittel, kann Eisbrei zukuenftig zur Kuehlung von Lebensmitteln in Supermaerkten verwendet werden. Dazu wird Eisbrei mit ca. 0 C fuer die Normalkuehlung, beziehungsweise mit ca. -25 C fuer die Tiefkuehlung benoetigt. Mit Glucose als Zusatzstoff laesst sich ein sehr feinkoerniger und damit pumpbarer Eisbrei fuer die Normalkuehlung erzeugen. Bei der Tiefkuehlung ist Natriumchlorid in einer eutektischen Konzentration mit geringen Mengen Ethanol empfehlenswert. Ethanol verfeinert die grobe Kristallstruktur des reinen eutektischen Natriumchlorid-Wasser-Gemisches und senkt den Gefrierpunkt. Des Weiteren wurde das Verfahren der

  9. APLICACIÓN DE REDES NEURONALES EN LA CLASIFICACIÓN DE ARCILLAS APLICAÇÃO DE REDES NEURONAIS NA CLASSIFICAÇÃO DE ARGILAS APPLICATION OF NEURAL NETWORKS IN CLASSIFICATION OF CLAYS

    Directory of Open Access Journals (Sweden)

    Jairo Gómez

    2012-06-01

    Full Text Available Las arcillas son la materia prima fundamental en la fabricación de productos para el sector constructor tales como baldosas, enchapes, pavimentos y ladrillos. Las pequeñas y medianas industrias ladrilleras por lo general utilizan arcillas de diverso origen mineralógico, clasificadas para formular sus mezclas con base en la experiencia del equipo de personas responsables de la producción; la incertidumbre asociada con este método causa que una parte de sus productos se rechacen después de fabricados, porque sus propiedades no cumplen las especificaciones técnicas. En este artículo se presenta una metodología basada en redes neuronales que permite clasificar, con base en sus propiedades, las arcillas que se van a usar para componer las pastas, con el propósito de disminuir la cantidad de producto rechazado. Se emplearon diversas topologías de red para la clasificación, lo cual permitió encontrar una capaz de predecir las muestras de entrenamiento y prueba con 97,79 % y 94,12 % de precisión, respectivamente.As argilas são a matéria prima fundamental na fabricação de produtos para o setor construtor tais como baldosas, revestimentos, pavimentos e tijolos. As pequenas e médias indústrias de tijolos geralmente utilizam argilas de diversa origem mineralógica, classificadas para formular suas misturas com base na experiência da equipe de pessoas responsáveis pela produção; a incerteza associada com este método causa que uma parte de seus produtos se rejeite depois de fabricados, porque suas propriedades não cumprem as especificações técnicas. Em este artigo apresenta-se uma metodologia baseada em redes neuronais que permite classificar, com base em suas propriedades, as argilas que se vão usar para compor as massas, com o propósito de diminuir a quantidade de produto rejeitado. Empregaram-se diversas topologias de rede para a classificação, o qual permitiu encontrar uma capaz de predizer as mostras de treinamento e

  10. Emisión Acústica y Redes Neuronales para Modelado y Caracterización del Proceso de Soldadura por Fricción Agitación

    Directory of Open Access Journals (Sweden)

    Emilio Jiménez Macías

    2013-10-01

    of the ANN, while the outputs of model include the welding parameters: tool rotation speed and travel speed, as well as the tool profile. A multilayer feed-forward ANN has been selected and trained, using different algorithms and network architectures. The parameters provided by the ANN constitute the model and the characterization of the FSW process; finally an analysis of the comparison between the measured and the calculated data is presented, validating the results. The model obtained can be used to develop the automatic control of the parameters of the FSW process, based on vibro-acoustic signals, which constitutes the following step in this research line. Palabras clave: Redes neuronales artificiales, análisis de señales, modelado, perceptrón multicapas, medición de vibraciones, soldadura por fricción agitación, Keywords: Artificial neural networks, signal analysis, modelling, multilayer perceptron, vibration measurement, friction stir welding

  11. Anwendung des autogenen Trainings im Kindesalter

    OpenAIRE

    Sühling, Nikola

    2004-01-01

    The autogenic training was developed by J.H.Schulz in the period between 1912-1920 based on the experiences of his hypnosis patients. These reported of a regular occurrence of certain perceptions at the beginning of the treatment. J.H.Schulz derived six exercises from this experience, through which the patient is said to get relaxed. Among others these exercises contain the idea to get warm and heavy arms and legs. Furthermore, physical reactions in the abdomen, thorax and the head will be in...

  12. Stimmrehabilitation und Psychotherapie - Anwendung bei Lehrern

    OpenAIRE

    Niebudek-Bogusz, E; Śliwinska-Kowalska, M

    2005-01-01

    Voice disorders in teachers are not only a serious medical but also social and economic problem in Poland. It has been shown that teachers are at risk of developing occupational dysphonia which account for over 25% of all occupational diseases diagnosed in Poland. Voice problems affects psychological wellbeing of teachers, while psychological factors may induce escalation of voice pathologies in this professional group. The study was aimed to assess the effectiveness of phoniatric treatment i...

  13. Mapeo curvas típicas demanda de energía eléctrica del sector residencial, comercial e industrial de la ciudad de Medellín, usando redes neuronales artificiales y algoritmos de interpolación

    Directory of Open Access Journals (Sweden)

    Héctor Tabares

    2008-01-01

    Full Text Available Uno de los principales problemas para modelar el consumo de energía eléctrica en un lugar determinado, consiste en la extracción del conocimiento cuando éste se encuentra almacenado en grandes volúmenes de información como, por ejemplo, registros históricos. De acuerdo con esta representación, cada hecho ocurrido y registrado está compuesto por una pareja de componentes (t, P en donde t representa el tiempo en el que se registro la muestra y P representa la potencia eléctrica consumida en ese instante. El registro diario cuenta con N casos que representa cada una de las parejas de estímulo-respuesta conocidas. El objetivo de este trabajo consiste en hallar una función que permita mapear el vector de variables de entrada t al vector de variables de salida P. donde F es una función cualquiera, en este caso el consumo de energía eléctrica. Su modelamiento con Redes Neuronales Artificiales (RNA es un Perceptron Multi Capa (PMC. Otra forma de modelarlo es usando Algoritmos de Interpolación (AI.

  14. Modélisation du changement d’échelles en télédétection par une méthode neuronale : application a l’étude de l’évolution de l’occupation hivernale des sols en Bretagne

    Directory of Open Access Journals (Sweden)

    Thomas Houet

    2004-05-01

    Full Text Available Le suivi de la couverture hivernale des sols constitue un des principaux enjeux de la réduction de la pollution de la ressource en eau en Bretagne, la présence de la végétation entravant les transferts de flux polluants vers les cours d’eau. Le suivi du ratio « sols nus / sols couverts » peut être réalisé à l’aide d’instruments satellitaires de façon quotidienne à une échelle régionale, mais à une résolution spatiale grossière par des capteurs de type SPOT VEGETATION (1 km. Il peut également être effectué à une résolution spatiale fine par des capteurs tel que SPOT HRVIR (20 m mais avec une acquisition d’images une ou deux fois par hiver seulement sur un territoire plus limité. Toute évolution de ce ratio, détectée à l’échelle régionale, peut être issue de variations de la couverture hivernale des sols, mais également de l’influence de facteurs climatiques. Les changements observés doivent alors être validés par une analyse à l’échelle locale. Le lien entre les images des deux capteurs est établi à partir du développement d’une méthode neuronale basée sur une carte de Kohonen. L’originalité de cette méthode réside dans l’utilisation de la dimension temporelle pour résoudre ce problème de changement d’échelles.

  15. UIS Baden-Wuerttemberg. AJA project. Application of JAVA-based solutions in environment, transport and administration. Phase II 2001; UIS Baden-Wuerttemberg. Projekt AJA. Anwendung JAVA-basierter Loesungen in den Bereichen Umwelt, Verkehr und Verwaltung. Phase II 2001

    Energy Technology Data Exchange (ETDEWEB)

    Mayer-Foell, R.; Keitel, A.; Geiger, W. (eds.)

    2001-12-01

    Information and communication technology facilitates data acquisition, recording, evaluation and transmission in many fields of society, but even experts tend to get lost in the flood of data that are available. In order to make it possible to integrate new technological developments in information systems, the Minister of Environment and Transportation continues the project AJA (''Application of JAVA-based solutions'') which was started in 2000. AJA is a sequel to the GLOBUS project which was terminated in 1999. (GLOBUS - Globale Umweltsachdaten im UIS Baden-Wuerttemberg und anderen Systemen). [German] Die Bereiche Umwelt, Verkehr und Verwaltung profitieren bei der Erhebung, Erfassung, Auswertung, Darstellung und Weitergabe ihrer Daten in hohem Masse von Informations- und Kommunikationstechnik (IuK). Manche Darstellungsweisen und Berechnungen werden dadurch erst moeglich. Uebergreifende Zusammenhaenge koennen mit Hilfe der IuK aufgezeigt werden. Die Verwaltung muss Technologien einsetzen, wie sie in der Wirtschaft fuer die Zusammenfuehrung von verteilten Unternehmensdaten verwendet werden, um Entscheidungs grundlagen fuer die Unternehmenspolitik zu liefern (z.B. Data Warehouse). In solchen ''Warenhaeusern von Daten'' finden sich oft nur Experten zurecht. Unsere Herausforderung ist es, diese komplexen Zusammenhaenge nicht nur dem Experten, sondern auch dem Buerger auf moeglichst einfache und wirtschaftliche Weise zu vermitteln. Dem Buerger ist der freie Zugang zu Informationen ueber die Umwelt zu ermoeglichen. Wir sind damit auf dem Wege zu einem Marktplatz von Daten und Informationen fuer den Buerger und die Verwaltung. Um neue technologische Entwicklungen in Informationssystemen einsetzen zu koennen, fuehrt das Ministerium fuer Umwelt und Verkehr (UVM) das 2000 begonnene FuE-Vorhaben AJA ''Anwendung JAVA-basierter Loesungen'' fort. AJA baut auf dem 1999 abgeschlossenen Vorhaben GLOBUS (Globale

  16. Aplicación de análisis de conglomerados y redes neuronales artificiales para la clasificación y selección de candidatos a residencias médicas Cluster analysis and artificial neural networks for residency candidates classification and selection

    Directory of Open Access Journals (Sweden)

    Raúl A. Borracci

    2005-03-01

    Full Text Available Introducción: Los programas educacionales han recurrido a distintos modelos de regresión lineal múltiple, de selección asistida por computadora y más recientemente, de redes neuronales artificiales para la confección de listados preliminares de mérito entre los postulantes a la residencia. Objetivo: evaluar y rediseñar un sistema para la selección y clasificación de aspirantes a un programa de residencias universitarias por medio de la aplicación de modelos de análisis multivariante y de redes neuronales artificiales. Material y Método: El diseño consistió en un estudio retrospectivo-transversal, realizado en un hospital universitario. Se evaluó una muestra al azar de 213 aspirantes a un programa de residencias médicas universitarias teniendo en cuenta el promedio de la carrera de grado, el resultado del examen de ingreso a la residencia, los antecedentes curriculares y biográficos, el internado y el puntaje de las entrevistas. Se aplicó un análisis de conglomerados jerárquico (clúster análisis para la clasificación y selección de los candidatos en un orden de mérito en base a los puntajes estandarizados de las 5 variables. Resultados: El análisis de conglomerados jerárquico clasificó 209 aspirantes en 12 conglomerados en base al promedio estandarizado de los valores obtenidos de las 5 variables. Este análisis se usó para construir una clasificación descriptiva de los grupos y una lista final por mérito de acuerdo a la posición relativa de cada candidato por encima o debajo de los puntajes promedios. Se imitó la solución de conglomerados por medio de una red perceptrón multicapa con una sensibilidad y especificidad de 94.1 y 99.1% respectivamente. Conclusiones: El análisis de conglomerados jerárquico fue un método útil y novedoso para clasificar una muestra de aspirantes a la residencia en conglomerados de acuerdo a la posición relativa de sus puntajes estandarizados por encima o por debajo de la media

  17. Determination of specific concentration variations of atmospheric trace elements in precipitation as a method for the estimation of spatial deposition into the soil by use of statistical methods; Ermittlung spezifischer Konzentrationsverlaeufe atmosphaerischer Spurenbestandteile in Niederschlaegen als Methode zur Abschaetzung des flaechenhaften Stoffeintrags in den Boden unter Anwendung statistischer Methoden

    Energy Technology Data Exchange (ETDEWEB)

    Busch, U. [Dortmund Univ. (Germany). Fachbereich Statistik; Vautz, W. [Institut fuer Spektrochemie und Angewandte Spektroskopie (ISAS), Dortmund (Germany); Klockow, D. [Institut fuer Spektrochemie und Angewandte Spektroskopie (ISAS), Dortmund (Germany); Urfer, W. [Dortmund Univ. (Germany). Fachbereich Statistik

    1995-08-01

    Witterungsdaten - und die genauere Abschaetzung der raeumlichen Verteilung von Stoffkonzentrationen in Niederschlaegen. Schliesslich wird ein Interpolationsverfahren fuer Depositionsdaten vorgeschlagen, das die geschaetzten Parameter dieser Modelle und Witterungsdaten als zusaetzliche Information verwendet. Seine Anwendung auf die Daten von 1992 ergibt erste Depositionskarten. Der Bericht schliesst mit einigen Vorschlaegen, wie die Ergebnisse aus diesem Projekt in zukuenftigen Untersuchungen zur trockenen Deposition verwendet werden koennten. (orig.)

  18. MR-Imaging optimisation of the articular hip cartilage by using a T{sub 1}-weighted 3-dimensional gradient-echo sequence and the application of a hip joint traction; Magnetresonanztomographische Optimierung der Hueftknorpeldarstellung durch die Wahl einer T{sub 1}-Volumen-Gradienten-Echo-Sequenz und die Anwendung einer Hueftgelenkstraktion

    Energy Technology Data Exchange (ETDEWEB)

    Rosenberg, R. [Heidelberg Univ. (Germany). Orthopaedische Klinik und Poliklinik; Bernd, L. [Heidelberg Univ. (Germany). Orthopaedische Klinik und Poliklinik; Wrazidlo, W. [ATOS-Praxisklinik, Heidelberg (Germany). Radiologische Gemeinschaftspraxis Drs. Lederer, Schneider und Wrazidlo; Lederer, W. [ATOS-Praxisklinik, Heidelberg (Germany). Radiologische Gemeinschaftspraxis Drs. Lederer, Schneider und Wrazidlo; Schneider, S. [ATOS-Praxisklinik, Heidelberg (Germany). Radiologische Gemeinschaftspraxis Drs. Lederer, Schneider und Wrazidlo

    1995-10-01

    Images of three animal cadaver hips, 8 dissected patient femoral heads and 18 hip joints of human corpses, all either with arthrosis stage I-III or artificial cartilage defects, were compared with their corresponding anatomic sections. Additional histomorphologic examinations of the arthrotic cartilages were conducted, and MR-Imaging of 20 healthy and 21 arthrotic patient hips was performed using a specific traction method. Using a T{sub 1}-weighted 3-dimensional gradient-echo sequence and a traction of the hip joint, it was possible due to the low-signal imaging of the joint space to separate in vivo the high-signal femoral head cartilage from the high-signal acetabular cartilage. In horizontal position of the phase-encoding parameter, minimisation of the chemical-shift artifact, mainly in the ventro-lateral areas, was accomplished. MRI measurements of the articular cartilage widths showed significant correlations (p < 0.001) with the corresponding anatomic sections. At the same time the T{sub 1} 3-dimensional gradient-echo sequence of the lateral femoral head with r = 0.94 showed the lowest deviations of the measurements. It was possible with MR-Imaging to distinguish four cartilage qualities. (orig./MG) [Deutsch] Im experimentellen Teil der Studie wurden den MRT-Bildern von drei Kadavertierhueften, 8 resezierten Patientenhueftkoepfen und 18 Leichenhueftgelenken, an denen entweder artifizielle Knorpeldefekte gesetzt wurden oder die ein Koxarthrose-Stadium I-III aufwiesen, die korrespondierenden makroskopischen Kryomikrotomschnitte zugeordnet. Bei den Koxarthrosen erfolgten zusaetzliche histomorphologische Knorpeluntersuchungen. Im klinischen Teil der Studie wurden 20 gesunde und 21 arthrotische Probandenhueftgelenke mit einem speziellen Traktionsverfahren untersucht. Unter Anwendung einer T{sub 1}-Volumen-Gradienten-Echo-Sequenz und einer Traktion am zu untersuchenden Hueftgelenk konnte in vivo durch die signalarme Darstellung des Gelenkspaltes der

  19. CNN-PROMOTER, NEW CONSENSUS PROMOTER PREDICTION PROGRAM BASED ON NEURAL NETWORKS CNN-PROMOTER, NUEVO PROGRAMA PARA LA PREDICCIÓN DE PROMOTORES BASADO EN REDES NEURONALES CNN-PROMOTER, NOVO PROGRAMA PARA A PREDIÇÃO DE PROMOTORES BASEADO EM REDES NEURONAIS

    Directory of Open Access Journals (Sweden)

    Óscar Bedoya

    2011-06-01

    Full Text Available A new promoter prediction program called CNN-Promoter is presented. CNN-Promoter allows DNA sequences to be submitted and predicts them as promoter or non-promoter. Several methods have been developed to predict the promoter regions of genomes in eukaryotic organisms including algorithms based on Markov's models, decision trees, and statistical methods. Although there are plenty of programs proposed, there is still a need to improve the sensitivity and specificity values. In this paper, a new program is proposed; it is based on the consensus strategy of using experts to make a better prediction. The consensus strategy is developed by using neural networks. During the training process, the sensitivity and specificity were 100 % and during the test process the model reaches a sensitivity of 74.5 % and a specificity of 82.7 %.En este artículo se presenta un programa nuevo para la predicción de promotores llamado CNN-Promoter, que toma como entrada secuencias de ADN y las clasifica como promotor o no promotor. Se han desarrollado diversos métodos para predecir las regiones promotoras en organismos eucariotas, muchos de los cuales se basan en modelos de Markov, árboles de decisión y métodos estadísticos. A pesar de la variedad de programas existentes para la predicción de promotores, se necesita aún mejorar los valores de sensibilidad y especificidad. Se propone un nuevo programa que se basa en la estrategia de mezcla de expertos usando redes neuronales. Los resultados obtenidos en las pruebas alcanzan valores de sensibilidad y especificidad de 100 % en el entrenamiento y de 74,5 % de sensibilidad y 82,7 % de especificidad en los conjuntos de validación y prueba.Neste artigo a presenta-se um novo programa para a predição de promotores chamado CNN-Promoter, que toma como entrada sequências de DNA e as classifica como promotor ou não promotor. Desenvolveramse diversos métodos para predizer as regiões promotoras em organismos eucariotas

  20. Un modelo de redes neuronales para complementariedad no lineal

    Directory of Open Access Journals (Sweden)

    Favián Arenas

    2016-01-01

    Full Text Available En este artí ulo presentamos un modelo de red neuronal para resolver el problema de omplementariedad no lineal. Para ello, reformulamos este problema omo uno de minimiza ión sin restri iones usando una familia uniparamétri a de fun iones de omplementariedad. Demostramos resultados de existen ia y onvergen ia de la traye toria de la red neuronal, así omo resultados de estabilidad en el sentido de Lyapunov, estabilidad asintóti a y exponen ial. Además, presentamos resultados numéri os preliminares que ilustran un buen desempeño prá ti o del modelo.

  1. Redes neuronales de propagación inversa

    Directory of Open Access Journals (Sweden)

    Jesús Alberto Delgado Rivera

    1992-05-01

    Full Text Available Este artículo presenta la red neuronal por capas, su algoritmo de aprendizaje y una aplicación. Para lograr este propósito se inicia con la neurona natural y su modelo Entrada/Salida denominado neurona artificial.

  2. Selección de Personal mediante Redes Neuronales Artificiales

    Directory of Open Access Journals (Sweden)

    German Leonardo Acevedo Orduña

    2011-04-01

    Full Text Available We study the personnel selection problem by the application of techniques of computing intelligence for the classification of psychological patterns. The system is based on the psychological test 16-PF, for the extraction of the First Order factors and the motivational distortion, for being used as entries in a pattern recognition algorithm that intends to predict behavior. Initially, we define the 16-PF test and the computational structures to be used. Then we describe the normalization and pattern extraction procedures, and finally, we provide experimental results for illustrating the performance of the classification techniques, which are analyzed in a problem of cadets selection for the Navy School Almirante Padilla.

  3. Neuronal nets in robotics; Redes neuronales en robotica

    Energy Technology Data Exchange (ETDEWEB)

    Jimenez Sanchez, Raul

    1999-06-01

    The paper gives a generic idea of the solutions that the neuronal nets contribute to the robotics. The advantages and the inconveniences are exposed that have regarding the conventional techniques. It also describe the more excellent applications as the pursuit of trajectories, the positioning based on images, the force control or of the mobile robots management, among others.

  4. Casein-Kinase-2-Beta und neuronale Entwicklungsprozesse

    OpenAIRE

    Kibler, Eike Mathias U.

    2003-01-01

    Die Pilzkörper von Drosophila melanogaster stellen eine für die Lebensfähigkeit dieses Organismus entbehrliche Gehirnstruktur dar. Die Entwicklungsprozesse, die der Bildung dieser zentralnervösen Struktur zugrunde liegen, sind gut erforscht. Die neuronalen Stammzellen, die für die Bildung dieser Gehirnstruktur verantwortlich sind, sind identifiziert und experimentell gut zugänglich. Daher bietet sich die Drosophila-Pilzkörperentwicklung als neurogenetisches Modellsystem an, grundlegende Mecha...

  5. Redes neuronales de expresión facial

    OpenAIRE

    Gordillo, F.; Mestas, Lilia; Castillo Parra, Gabriela; Pérez, M.A.; López, R. M.; Arana, José M.

    2017-01-01

    Introducción. La percepción de caras involucra una amplia red de conexiones entre regiones corticales y subcorticales que intercambian y sincronizan información a través de haces de sustancia blanca. Este preciso sistema de comunicación puede verse afectado tanto a través de las propias estructuras como por las vías que las conectan. Objetivos. Delimitar el sustrato neuronal que subyace a la percepción de la expresión facial y analizar los diferentes factores que participan modulando l...

  6. Development and application of dynamic MR-imaging for evaluation of perfusion changes in rectal carcinoma during a course of radiotherapy in clinical use. Preliminary results; Entwicklung und Anwendung dynamischer MRT-Messungen zur Evaluierung von Perfusionsveraenderungen bei Rektumkarzinomen unter Bestrahlung in der klinischen Routine. Erste Ergebnisse

    Energy Technology Data Exchange (ETDEWEB)

    Vries, A. de; Griebel, J.; Gneiting, T.; Hoflehner, J.; Brandl, M.; Lukas, P. [Leopold-Franzens-Univ. Innsbruck (Austria). Universitaetsklinik fuer Strahlentherapie - Radioonkologie; Judmaier, W.; Kremser, C.; Schocke, M.; Aichner, F. [Leopold-Franzens-Univ. Innsbruck (Austria). Inst. fuer Magnetresonanztomographie; Peer, S.; Rettl, G. [Leopold-Franzens-Univ. Innsbruck (Austria). Universitaetsklinik fuer Radiodiagnostik I; Oefner, D. [Leopold-Franzens-Univ. Innsbruck (Austria). Universitaetsklinik fuer Chirurgie; Debbage, P. [Leopold-Franzens-Univ. Innsbruck (Austria). Inst. fuer Histologie und Embryologie

    1999-11-01

    procedures. (orig.) [German] Ziel: Entwicklung und Anwendung dynamischer Magnetresonanztomographiemessungen zur Erhebung von Perfusionsparametern bei Rektumkarzinomen unter Bestrahlung in der klinischen Routine. Patienten und Methode: Bei Rektumkarzinompatienten (n=8), die sich einer praeoperativen kombinierten Radiochemotherapie unterzogen, wurden Perfusionsdaten erhoben. An einem 1,5-Tesla-Ganzkoerperkernspintomographen wurden ultraschnelle T1-Mapping-Sequenzen zum Erhalt von T1-Maps mit Intervallen von 14 und 120 Sekunden implementiert. Die Messzeit der dynamischen Messungen betrug 40 Minuten. Die Messschicht (Schichtdicke 5 mm) wurde so gewaehlt, dass sowohl Tumor als auch arterielle Gefaesse dargestellt wurden. Gadolinium-DTPA-(Gd-DTPA-)Konzentrations-Zeit-Kurven wurden nach einem prolongierten Bolus im arteriellen Blut und im Tumor berechnet. Die angewendete Methode erlaubte eine raeumliche Aufloesung von 2x2x5 mm und eine zeitliche Aufloesung von 14 Sekunden. Die Messdaten wurden vor und in konstanten Intervallen waehrend Therapie erhoben. Ergebnisse: Die raeumliche und zeitliche Aufloesung der T1-Maps war ausreichend, um Areale mit unterschiedlicher Kontrastmittelkinetik innerhalb des Tumors zu erfassen sowie die grossen Beckenarterien sicher zu identifizieren. Bei sechs Patienten konnten Gd-DTPA-Konzentrationskurven im Tumor unter Therapie erhoben werden. Der Perfusionsindex (Pi) versus Strahlendosis zeigte eine signifikante Zunahme in der ersten oder zweiten Woche der Bestrahlung, bevor er entweder kontinuierlich absank oder nach anfaenglichem Abfall einen erneuten Anstieg aufwies. Der durchschnittliche Pi-Ausgangswert betrug 0,16 ({+-}0,049), das durchschnittliche Pi-Maximum war 0,23 ({+-}0,058). Die relativen Perfusionsveraenderungen betrugen zwischen 20 und 83%. Schlussfolgerung: Unsere Ergebnisse zeigen, dass sich die verwendete Methode zur Erfassung von Perfusionsparametern unter Bestrahlung eignet und in der klinischen Routine anwendbar ist. In der Zukunft

  7. UIS Baden-Wuerttemberg. Project AJA. Application of JAVA-based and other efficient solutions in the areas of environment, traffic and administration. Phase V 2004; UIS Baden-Wuerttemberg. Projekt AJA. Anwendung JAVA-basierter und anderer leistungsfaehiger Loesungen in den Bereichen Umwelt, Verkehr und Verwaltung. Phase V 2004

    Energy Technology Data Exchange (ETDEWEB)

    Mayer-Foell, R.; Keitel, A.; Geiger, W. (eds.)

    2004-12-01

    Bundeslaendern die Umsetzung von Verwaltungsreformen - in Baden-Wuerttemberg der Vollzug des Verwaltungsstruktur-Reformgesetzes (VRG) - sowie die Umsetzung von e-Government-Konzepten derzeit zu zusaetzlichen Anforderungen an die Verwaltung und ihre IuK-Technik. Durch den Einsatz innovativer Informationstechnologien kann in vielen Bereichen ein bedeutender Beitrag zur Erfuellung dieser Anforderungen geleistet werden; genannt seien hier Portal-, Content-Management- und Integrations-Technologien sowie neue Techniken fuer den Web-basierten und mobilen Zugriff auf Informationen. Entwicklung uf Pflege der neuen Informations- und Kommunikationssysteme erfordern oft nicht unerhebliche Mittel. Aufgrund der knappen Haushaltslage der Gebietskoerperschaften koennen diese Mittel von den einzelnen zustaendigen Stellen zunehmend nicht mehr aufgebracht werden. Auch wuerden Einzelentwicklungen nicht den Anforderungen zum sparsamen Umgang mit Haushaltsmitteln und groesstmoeglicher Effektivitaet der eingesetzten Mittel entsprechen. Ein wichtiges Mittel, um diese Herausforderung zu bewaeltigen, ist die verstaerkte Zusammenarbeit der Gebietskoerperschaften bei der Entwicklung und Pflege der Informationssysteme. Um die Zusammenarbeit innerhalb des Landes Baden-Wuerttemberg sowie mit dem Bund und anderen Laendern zu foerdern, wurde Ende 1999 das F+E-Projekt AJA (Anwendung JAVA-basierter und anderer leistungsfaehiger Loesungen in den Bereichen Umwelt, Verkehr und Verwaltung) gegruendet. Das Projekt AJA ist im Jahr 2004 in seine fuenfte Phase gegangen und wird mit dieser Phase abgeschlossen. Der vorliegende Bericht ist die Projektdokumentation der Phase V von AJA im Jahr 2004. Er gibt die Aufgabenstellungen und die Ergebnisse der 19 F+E-Arbeiten wieder. (orig.)

  8. Turbulence models development and engineering applications; Turbulenzmodellentwicklung und ingenieurtechnische Anwendung

    Energy Technology Data Exchange (ETDEWEB)

    Groetzbach, G.; Ammann, T.; Dorr, B.; Hiltner, I.; Hofmann, S.; Kampczyk, M.; Kimhi, Y.; Seiter, C.; Woerner, M.; Alef, M.; Hennemuth, A.

    1995-08-01

    The FLUTAN code is used for analyzing the decay heat removal in new reactor concepts. The turbulence models applied in FLUTAN are improved by the development of the TURBIT code. TURBIT serves for a numerical simulation of turbulent channel flow. (orig.)

  9. Sensors - technology and application. Sensoren - Technologie und Anwendung

    Energy Technology Data Exchange (ETDEWEB)

    1982-01-01

    The development of sensors could not keep pace with the progress made in microelectronics. The monolithic integration of sensor and signal processing circuits was realised in some cases. More development is needed though before they can be applied in microelectronics, household appliances and automobiles. Descriptions are supplied of: new materials and technologies for sensors, sensor systems, sensors for mechanical parameters, temperatures, chemical paramters and sensors on magnetic basis.

  10. Smoothed Bootstrap und seine Anwendung in parametrischen Testverfahren

    Directory of Open Access Journals (Sweden)

    Handschuh, Dmitri

    2015-03-01

    Full Text Available In empirical research, the distribution of observations is usually unknown. This creates a problem if parametric methods are to be employed. The functionality of parametric methods relies on strong parametric assumptions. If these are violated the result of using classical parametric methods is questionable. Therefore, modifications of the parametric methods are required, if the appropriateness of their assumptions is in doubt. In this article, a modification of the smoothed bootstrap is presented (using the linear interpolation to approximate the distribution law suggested by the data. The application of this modification to statistical parametric methods allows taking into account deviations of the observed data distributions from the classical distribution assumptions without changing to other hypotheses, which often is implicit in using nonparametric methods. The approach is based on Monte Carlo method and is presented using one-way ANOVA as an example. The original and the modified statistical methods lead to identical outcomes when the assumptions of the original method are satisfied. For strong violations of the distributional assumptions, the modified version of the method is generally preferable. All procedures have been implemented in SAS. Test characteristics (type 1 error, the operating characteristic curve of the modified ANOVA are calculated.

  11. Búsqueda de recursos en redes peer-to-peer totalmente descentralizadas basada en redes neuronales artificiales

    OpenAIRE

    Corbalán, Leonardo César

    2014-01-01

    Las redes Peer-to-Peer (P2P) puras no estructuradas como Gnutella, dónde los nodos se conectan entre sí como pares o iguales, sin roles diferenciados ni jerarquías de ninguna clase, son sistemas distribuidos, dinámicos, sin punto alguno de centralización, que favorecen la robustez y tolerancia a fallos. Sin embargo, la búsqueda de recursos en estos sistemas constituye un problema esencial. El algoritmo de búsqueda BFS de Gnutella genera gran cantidad de tráfico dificultando su escalabilidad. ...

  12. Modelo inverso de amortiguador magneto-reológico basado en redes neuronales

    OpenAIRE

    Sanz Benito, Pablo

    2014-01-01

    The suspension of a vehicle plays an important role in both the stability and the comfort of the occupants. There are three types of suspension, the suspension first passive and active suspension semi-active suspension. Passive suspension is the simplest of all, to record such a shock absorber oil and typically a helical spring. The semi-active suspensions and active have a higher complexity but also better results. Active suspension include controlling the stability of each wheel independent...

  13. Modelo inverso de un amortiguador magneto-reológico utilizando redes neuronales

    OpenAIRE

    Menéndez Pamplona, Paloma

    2014-01-01

    This Final Degree Project aims to model an inverse magneto-rheological damper based on Artificial Neural Networks. The principal function of the suspension system of a vehicle is to keep the tires in contact to the road, absorbing the vibrations generated in the vehicle and giving security as well as comfort to the passengers. The main components of the suspension system are elastic components such as helical springs or the anti-roll bar and the damper. There are three types of suspensi...

  14. Reconstruction of neutron spectra through neural networks; Reconstruccion de espectros de neutrones mediante redes neuronales

    Energy Technology Data Exchange (ETDEWEB)

    Vega C, H.R.; Hernandez D, V.M.; Manzanares A, E. [Cuerpo Academico de Radiobiologia, Estudios Nucleares, Universidad Autonoma de Zacatecas, A.P. 336, 98000 Zacatecas (Mexico)] e-mail: rvega@cantera.reduaz.mx [and others

    2003-07-01

    A neural network has been used to reconstruct the neutron spectra starting from the counting rates of the detectors of the Bonner sphere spectrophotometric system. A group of 56 neutron spectra was selected to calculate the counting rates that would produce in a Bonner sphere system, with these data and the spectra it was trained the neural network. To prove the performance of the net, 12 spectra were used, 6 were taken of the group used for the training, 3 were obtained of mathematical functions and those other 3 correspond to real spectra. When comparing the original spectra of those reconstructed by the net we find that our net has a poor performance when reconstructing monoenergetic spectra, this attributes it to those characteristic of the spectra used for the training of the neural network, however for the other groups of spectra the results of the net are appropriate with the prospective ones. (Author)

  15. Redes neuronales y predicción de tráfico

    Directory of Open Access Journals (Sweden)

    Nelson Stivet Torres Álvarez

    2011-12-01

    Full Text Available This paper shows the development of a traffic model based on neural networks. Traf c data used in training of the neural network were extracted from a data network through the Ethernet LAN Ethereal Sniffer; also MATLAB software was used to modeling the three-layer neural network. The results show the exibility and accuracy of neural networks in modeling of Ethernet network traf c, if you have a suf cient number of samples of traffic to train it.

  16. Biónica e implantes neuronales, nuevo paradigma para la rehabilitación

    Directory of Open Access Journals (Sweden)

    Álvaro Hernández Ramírez Llinás

    2010-01-01

    Full Text Available La microelectrónica avanzada para procesamiento de señales, está acercando el sueño de mezclar el hombre y la máquina a la realidad. En estos sistemas artificiales el flujo de información se realiza a través de cables, buses, y en algunos casos mediante enlaces de radio, mientras que en los seres vivos, la transmisión se realiza a través de los nervios, que actúan como el equivalente de esos cables. Los dos sistemas se han comunicado a través de dispositivos simples como teclado, mouse, pantallas táctiles, que se van sofisticando y aumentan su complejidad, como la estimulación eléctrica o neuromuscular para provocar movimientos funcionales o las llamadas prótesis sensoriales, para restaurar la pérdida de algún órgano.

  17. Nuevas tecnicas basadas en redes neuronales para el diseno de filtros de microondas multicapa apantallados

    Science.gov (United States)

    Pascual Garcia, Juan

    In this PhD thesis one method of shielded multilayer circuit neural network based analysis has been developed. One of the most successful analysis procedures of these kind of structures is the Integral Equation technique (IE) solved by the Method of Moments (MoM). In order to solve the IE, in the version which uses the media relevant potentials, it is necessary to have a formulation of the Green's functions associated to the mentioned potentials. The main computational burden in the IE resolution lies on the numerical evaluation of the Green's functions. In this work, the circuit analysis has been drastically accelerated thanks to the approximation of the Green's functions by means of neural networks. Once trained, the neural networks substitute the Green's functions in the IE. Two different types of neural networks have been used: the Radial basis function neural networks (RBFNN) and the Chebyshev neural networks. Thanks mainly to two distinct operations the correct approximation of the Green's functions has been possible. On the one hand, a very effective input space division has been developed. On the other hand, the elimination of the singularity makes feasible the approximation of slow variation functions. Two different singularity elimination strategies have been developed. The first one is based on the multiplication by the source-observation points distance (rho). The second one outperforms the first one. It consists of the extraction of two layers of spatial images from the whole summation of images. With regard to the Chebyshev neural networks, the OLS training algorithm has been applied in a novel fashion. This method allows the optimum design in this kind of neural networks. In this way, the performance of these neural networks outperforms greatly the RBFNNs one. In both networks, the time gain reached makes the neural method profitable. The time invested in the input space division and in the neural training is negligible with only few circuit analysis. To show, in a practical way, the ability of the neural based analysis method, two new design procedures have been developed. The first method uses the Genetic Algorithms to optimize an initial filter which does not fulfill the established specifications. A new fitness function, specially well suited to design filters, has been defined in order to assure the correct convergence of the optimization process. This new function measures the fulfillment of the specifications and it also prevents the appearance of the premature convergence problem. The second method is found on the approximation, by means of neural networks, of the relations between the electrical parameters, which defined the circuit response, and the physical dimensions that synthesize the aforementioned parameters. The neural networks trained with these data can be used in the design of many circuits in a given structure. Both methods had been show their ability in the design of practical filters.

  18. Bases neuronales del recuerdo y la extinción de la memoria espacial

    OpenAIRE

    Méndez-López Couz, Marta

    2016-01-01

    El aprendizaje y la memoria espacial son habilidades vitales en los animales para orientarse y recordar la posición de lugares de interés en su ambiente, así como para mantener el sentido de la dirección y la localización mientras nos movemos en él, y para adaptarnos a nuevos entornos. La memoria espacial representa una de las funciones cognitivas más básicas y esenciales, además de ser particularmente compleja, ya que el sistema nervioso integra información multisensorial de nuestro entorno ...

  19. Redes neuronales artificiales para el análisis de componentes principales. La red de OJA

    Directory of Open Access Journals (Sweden)

    Piedad Tolmos Rodríguez-Piñero

    2000-01-01

    Full Text Available El análisis de componentes principales es una herramienta estadísticomatemática de gran utilidad en multitud de campos, especialmente en el de la compresión de datos. En este artículo se estudia el proceso de la extracción de componentes principales, y se detalla una Red Neuronal Artificial, la red de Oja, diseñada específicamente para el cálculo de la primera componente principal de la matriz de momentos de segundo orden asociada al vector de datos. Se concluye exponiendo algunas redes que generalizan la red de Oja, y permiten extraer el número deseado de componentes principales. Finalmente se explican algunas aplicaciones, fundamentalmente la del procesamiento de imágenes, y la compresión de datos.

  20. Redes Neuronales Artificiales en la predicción de errores, aplicado a redes de computadoras

    OpenAIRE

    Aguilar Durán, Rosendo Arturo

    2002-01-01

    Las redes de computadoras son vitales para los negocios, ya que me permiten compartir y acceder información, además de tener una amplia comunicación con las personas, día a día el avance de la tecnología hace que las redes de computadoras tengan mayor velocidad por lo tanto sean mas complejas, todo esto conlleva a que administrarlas sea todo un reto. Para tener una buena administración no importando la complejidad de la misma, es necesario contar con ...

  1. Neues Punktionsinstrumentarium: Provox-Vega®-Punktionsset: Anwendung beim Einbringen einer Stimmprothese nach Laryngektomie

    NARCIS (Netherlands)

    Lorenz, K.J.; Hilgers, F.M.; Maier, H.

    2013-01-01

    Background The use of voice prostheses has been considered the gold standard in voice rehabilitation following laryngectomy for the last 20 years. Insertion is generally performed as a primary procedure during laryngectomy or as a secondary procedure with a re-usable trocar or rigid esophagoscope, a

  2. Application of soil data in climate research; Anwendung von Bodendaten in der Klimaforschung

    Energy Technology Data Exchange (ETDEWEB)

    Kaufmann-Boll, Carolin; Kappler, Wolfgang; Lazar, Silvia [ahu AG Wasser - Boden - Geomatik, Aachen (DE)

    2011-10-15

    The German Strategy for Adaptation to Climate Change was adopted in 2008. The implementation of the strategy requires reliable data and time series on the long-term changes in soil condition and soil functions. Soil monitoring and soil survey are essential data bases for this purpose. In Germany there are permanently established monitoring programmes with representative locations and repeated soil surveys based on a regular grid of sites. The different programmes vary in respect to harmonization regarding agreed principles between the participating institutions. Information on soil measuring data is currently heterogeneous and distributed at many locations. Particularly the provision of (meta-)data should be improved. Here you can find the exceptional quality of BOKLIM. It evaluates the suitability of soil data for climate research across the different measuring programmes in Germany. The most important nation-wide and permanently operating programmes of soil monitoring and soil survey were taken into account. The main aspects were the changes in soil condition due to climate change. As a result, the programmes provide a variety of valuable data to assess the effects of climate change on soils. Depending on the problem and the resulting requirements, the data are suitable (1) for the long-term monitoring of changes in soil condition, (2) for detailed process studies and measurements at representative locations, e.g. for the calibration and validation of predictive models, and (3) for use in model scenarios predicting changes in soil condition. However, it is necessary to coordinate the programmes of soil monitoring and soil survey with the focus on precise questions. The programmes have to be optimized at certain points to improve for issues of climate change and adaptation. In addition to the evaluation of soil data, a first concept for an efficient data provision and data use was created. Recommendations for next steps to coordinate and optimize future monitoring and survey activities and for data provision are advised to the relevant competent institutions and actors. Further research needs were identified. The recommendations aim at improving the interaction between climate change and soil conditions. They can also be taken up for other research fields such as soil protection aspects or biodiversity strategy aspects. (orig.)

  3. Diffusion imaging: technology and clinical application; Diffusionsbildgebung. Technik und klinische Anwendung

    Energy Technology Data Exchange (ETDEWEB)

    Kukuk, Guido Matthias; Greschus, Susanne; Pieper, Claus Christian [Universitaetsklinik Bonn (Germany). Radiologische Klinik; Goldstein, Jan [Staedtisches Klinikum Solingen (Germany). Inst. fuer Diagnostische und Interventionelle Radiologie

    2017-03-15

    While diffusion imaging was predominantly used for cerebral ischemia diagnostics it is now a widely applied MR diagnostic tool for oncologic or inflammatory diseases. The contribution is focused on the fundamentals of diffusion imaging and the most important indications.

  4. Mesostrukturierung und chemische Modifikation von Kathodenmaterialien zur Anwendung in Lithium-Schwefel Batterien

    OpenAIRE

    Schneider, Artur

    2016-01-01

    Die vorliegende Dissertation beschäftigt sich mit der Strukturierung und Charakterisierung von Kohlenstoffmaterialien, ihrer chemischen Modifikation, sowie deren Einsatz als Kathodenmaterialien in Lithium-Schwefel Batterien.

  5. Ein Vorschlag zur Wahl der Zuchtwerte bei der Anwendung dermarkergestützten Selektion

    DEFF Research Database (Denmark)

    Thomsen, Hauke

    2009-01-01

    Im Rahmen dieser Simulationsstudie wurde ein Enkelinnendesign mit 10 Großvätern erstellt, um die Einflüsse unterschiedlicher Eingabevariablen in der markergestützten Selektion zu untersuchen. Dabei wurden genotypische und phänotypische Daten für die Großväter, Großmütter und 500 Söhne simuliert. ......,89), so dass empfohlen wird diese Eingabevariable in der markergestützten Zuchtwertschätzung zu verwenden...

  6. Application of soil data on adaptation of climate; Anwendung von Bodendaten bei der Klimaanpassung

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2010-05-15

    Within the workshop of the Federal Environment Agency (Dessau-Rosslau, Federal Republic of Germany) at 20th to 30th September, 2009 in Dessau (Federal Republic of Germany), the following lectures were held: (1) Action plan adaptation - Adaptation measures and their verifiability on the basis of soil data (K. Mattern); (2) Legal background of the provision of metadata (H. Ginzky); (3) Which soil data are necessary? Requirements of Evaluation of the impact of climatic change and adaptation (W. Eckelmann); (4) Which soil data are present? Chances, deficits and recommendations for action (C. Kaufmann); (5) Instruments for providing metadata (W. Kappler); (6) Project TERENO - Soil atmosphere interactions induced by land use changes as a result of global change (H. Bogena, T. Puetz, H. Vereecken); (7) Further development and implementation of an European forest monitoring sysem (O. Granke); (8) Survey of the state of soil in agriculture and forestry (S. Schobel, C. Siebner); (9) Requirements on soil data from the view of the European Community (L. Montanarella); (10) Resume, view into the future, experiences with the market (F. Makeschin, H.G. Meiners, J. Mathews).

  7. Darstellung und Anwendung eines Bewertungsmodells im Rahmen des Controllings unter Beachtung der IAS/IFRS

    OpenAIRE

    Volkmann, Sebastian

    2005-01-01

    Die zunehmende Etablierung des Shareholder Value-Gedankens in Europa, die Rechnungslegung nach IAS/IFRS in Kombination mit der Forderung nach Konvergenz des internen sowie des externen Rechnungswesens erfordern die vertiefte Kapitalmarktorientierung von Unternehmen. Entsprechend werden in dieser Arbeit Ansätze diskutiert, die wertorientierte Unternehmensführung mit Hilfe eines Bewertungsmodells zu unterstützen, um Implementierungslücken auf Ebene des Konzern- oder Geschäftsbereichscontrolling...

  8. Mobile high-voltage switchboard. Variable and uncomplicated; Mobile Hochspannungsschaltanlage. Variabel und unkompliziert in der Anwendung

    Energy Technology Data Exchange (ETDEWEB)

    Albert, Andreas [Siemens AG, Erlangen (Germany). Sector Energy

    2009-07-13

    The mobile high-voltage switchboard ''REE-Movil 2'' for voltages up to 245 kV provides a complete and nearly autonomous switchboard in a container, a solution that has been available in the medium-voltage sector for some time already. It can be used whenever a quick replacement of a switchboard section or a temporary supplement to a switching substation is needed. The container is mounted on a trailer for maximum flexibility and mobility. (orig.)

  9. Computer-tomography and its use in failure analysis; Computertomographie und deren Anwendung in der Schadensanalytik

    Energy Technology Data Exchange (ETDEWEB)

    Panzenboeck, Michael; Freitag, Caroline [Montanuniv. Leoben (Austria). Dept. Metallkunde und Werkstoffpruefung; Borchert, Marlies [Materials Center Leoben (Austria)

    2017-04-15

    In the last fifteen years computer-tomography has proven to be a valuable aid in the fields of medicine, materials technology and forensics. Nowadays it is hard to image non-destructive testing being carried out without its use. This article serves to demonstrate the power of the technique within the field of failure analysis with reference to two chosen case studies. The first case concerns the failure of magnetic valves, the second case focusses on the failure of corrosion resistant screws.

  10. Application of thermodynamic data from THEREDA with THROUHREACT; Anwendung thermodynamischer Daten aus THEREDA mit TOUGHREACT

    Energy Technology Data Exchange (ETDEWEB)

    Seher, Holger; Weyand, Torben; Bracke, Guido

    2017-02-15

    Codes from the TOUGH family are used by GRS for many issues of the final radioactive waste disposal. For geochemical modeling in highly saline solutions the project THEREDA offers qualified thermodynamic data sets with Pitzer parameters that can be used as input data for specific systems and geochemical codes. For the application of thermodynamic data base from THEREDA in model calculations with THROUGHREACT a tool for the reformatting of the data sets was developed. THROUGHREACT will be used in the future for modeling of reactive transport in final radioactive waste repositories including complex processes.

  11. Hydrogen - more than just a mobile application; Wasserstoff - mehr als nur eine mobile Anwendung

    Energy Technology Data Exchange (ETDEWEB)

    Pitschak, Bernd [Hydrogenics GmbH, Gladbeck (Germany)

    2013-03-15

    The securing of a reliable, economical and environmentally friendly energy supply is one of the greatest challenges of the 21st century. Using the energy concept, the Federal Government formulates guidelines for such an energy supply and describes for the first time the way for the age of renewable energy. It is all about the development and implementation of an overall long-term strategy for the time period up to 2050.

  12. Beeinflussung des Angebots im Lebensmitteleinzelhandel durch Konsumenteninformationen: Eine Anwendung auf Basis der Theory of Planned Behavior

    OpenAIRE

    Mecking, Rebecca-Ariane

    2015-01-01

    Von Informationen, die Konsumenten z. B. über Kundenkarten dem Lebensmitteleinzelhandel (LEH) mitteilen, können auch sie selber profitieren, indem das Angebot besser an ihre Bedürfnisse angepasst wird. Basierend auf der Theory of Planned Behavior untersucht diese Arbeit, welche Faktoren entscheidend dafür sind, ob ein Konsument dem LEH zum Zwecke der Einflussnahme Informationen mitteilen möchte. Wichtig sind das Bewusstsein um diese Chance und ihre positiven Folgen. Sorgen um die Privatsphäre...

  13. Eine praktische Anwendung von CMC-Flächen in der Bionik

    OpenAIRE

    Apeltauer, Christian

    2011-01-01

    Die vorliegende Arbeit beschäftigt sich mit den theoretischen Grundlagen für die Entwicklung von Oberflächen, die unter Wasser möglichst lange eine Luftschicht an sich halten können. Ein natürliches Vorbild für solche Oberflächen ist die Pflanze Salvinia molesta; technisch interessieren solche Oberflächen zur Verringerung des Wasserwiderstandes von Schiffen und als Schutz vor Besiedlung durch Wasserorganismen. Wichtigste Gleichung bei der Entwicklung solcher Oberflächen ist...

  14. Cutting with laser beams and water jets. Schneiden mit Laserstrahlung und Wasserstrahl; Anwendung, Erfahrungen, Ausblick

    Energy Technology Data Exchange (ETDEWEB)

    Engemann, B.K.; Herbrich, H.; Kessler, B.; Langemann, M.

    1993-01-01

    Cutting with laser beams and water jets left the laboratory stage about 20 years ago and has been used commercially in the last few years to an increasing extent. Both techniques offer a fast and low-cost option for producing materials and components that cannot, or only with difficulty, be worked with mechanical separation methods. The book discusses: Equipment and systems for beam generation; control systems and auxiliary systems; process fundamentals and parameters; applications. The book attempts a comprehensive review of the fields of application of both systems as well as a list of the systems now available on the market. (orig./RHM). 131 figs.

  15. Anwendung der isothermalen Mikrokalorimetrie zur physikochemischen Charakterisierung molekularer Interaktionen in pharmazeutischen Formulierungen

    OpenAIRE

    Schicke, Burkhard Christoph

    2010-01-01

    Die isothermalen Mikrokalorimetrie (IMC) ermöglicht die Erfassung von Wärmeflüssen im Mikrowattbereich. Der Nutzen und die Aussagekraft dieser Methode wurden bei folgenden physikochemischen Prozessen untersucht: Hydratation von Diclofenac-Natrium (DfNa) zum Tetrahydrat bei verschiedenen Temperaturen und relativen Feuchten, Kompatibilitäts¬untersuchungen von DfNa und amphiphiler Stärke bei 100% rH und Temperaturen bis zu 313 K, Kristallisationsverhalten von unterschiedlichen Triglycerid-Phosph...

  16. Anwendung von kathodischen Korrosionsschutzmaßnahmen bei 30 Spannbetonbrücken in den Niederlanden

    NARCIS (Netherlands)

    Hondel, H. van den; Klamer, E.L.; Gulikers, J.; Polder, R.B.

    2015-01-01

    Die oberste niederländische Straßen- und Wasserbaubehörde (Rijkswaterstaat) hat im Hinblick auf die langfristige Instandhaltung ihrer Infrastruktureinrichtungen über 1500 Endverankerungsbereiche von Spannbetonbrückenträgern instandgesetzt und einer kathodischen Korrosionsschutzbehandlung (KKS)

  17. Konsensus zur Anwendung der "Tension-free Vaginal Tape" (TVT Operation bei der weiblichen Belastungsinkontinenz

    Directory of Open Access Journals (Sweden)

    Hanzal E

    2003-01-01

    Full Text Available Unter der Patronanz der Medizinischen Gesellschaft für Inkontinenzhilfe Österreich wurde im Juni 2002 in Wien die 2. Auflage eines Österreichischen Tension-free Vaginal Tape (TVT Konsensus-Meetings abgehalten. TVT ist eine neue Operationstechnik zur Behandlung der weiblichen Stressharninkontinenz, die seit 1998 in Österreich eingesetzt wird. Im Rahmen des Treffens, an dem Experten aus den Fachbereichen Urologie und Gynäkologie teilnahmen, wurde die vorhandene Fachliteratur analysiert und ein Konsensus für die präoperative Abklärung, Durchführung und postoperative Verlaufskontrolle als Basis für eine laufende Qualitätsverbesserung des Verfahrens erarbeitet, dessen Ergebnis in dem vorliegenden Papier als Leitlinie zusammengefaßt ist.

  18. Application of diffusion tensor imaging in neurosurgery; Anwendung der Diffusions-Tensor-Bildgebung in der Neurochirurgie

    Energy Technology Data Exchange (ETDEWEB)

    Saur, R. [Sektion fuer Experimentelle Kernspinresonanz des ZNS, Abt. Neuroradiologie, Universitaetsklinikum Tuebingen (Germany); Augenklinik des Universitaetsklinikums Tuebingen (Germany); Klinik fuer Psychiatrie und Psychotherapie des Universitaetsklinikums Tuebingen (Germany); Gharabaghi, A. [Klinik fuer Neurochirurgie des Universitaetsklinikums Tuebingen (Germany); Erb, M. [Sektion fuer Experimentelle Kernspinresonanz des ZNS, Abt. Neuroradiologie, Universitaetsklinikum Tuebingen (Germany)

    2007-07-01

    Knowledge about integrity and location of fibre tracts arising from eloquent cortical areas is important to plan neurosurgical interventions and to allow maximization of resection of pathological tissue while preserving vital white matter tracts. Diffusion Tensor Imaging (DTI) is so far the only method to get preoperatively an impression of the individual complexity of nerve bundles. Thereby nerve fibres are not mapped directly. They are derived indirectly by analysis of the directional distribution of diffusion of water molecules which is influenced mainly by large fibre tracts. From acquisition to reconstruction and visualisation of the fibre tracts many representational stages and working steps have to be passed. Exact knowledge about problems of Diffusion Imaging is important for interpretation of the results. Particularly, brain tumor edema, intraoperative brain shift, MR-artefacts and limitations of the mathematical models and algorithms challenge DTI-developers and applicants. (orig.)

  19. Entwicklung und Anwendung von Methoden zur Bestimmung von Selen-Spezies in human-biologischem Material

    OpenAIRE

    Jäger, Thomas

    2014-01-01

    Selen ist essentieller Bestandteil von mehr als 25 physiologisch wichtigen menschlichen Enzymen. Der tägliche Bedarf wird überwiegend in Form von organischen Selenverbindungen wie Selenmethionin oder Selenocystein aus der Nahrung aufgenommen. Weitere Expositionswege sind die Einnahme von Nahrungsergänzungsmitteln zur Selensupplementation sowie die inhalative oder dermale Aufnahme von in erster Linie anorganischen Selenverbindungen oder elementarem Selen an Arbeitsplätzen der Selen-verarbeiten...

  20. From clay bricks to deep underground storage; vom lehmziegel bis zum tiefenlager -- anwendung von ton

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2012-05-15

    This booklet issued by the Swiss National Cooperative for the Disposal of Radioactive Waste NAGRA takes a look at the use of clay strata for the storage of radioactive wastes in deep-lying repositories. First of all, a geological foray is made concerning the history of the use of clay and its multifarious uses. The characteristics of clay and its composition are examined and its formation in the geological past is explained. In particular Opalinus clay is looked at and the structures to be found are discussed. The clay's various properties and industrial uses are examined and its sealing properties are examined. Also, Bentonite clay is mentioned and work done by Nagra and co-researchers is noted.

  1. Vom "Deficit Accounting" zum "Generational Accounting ": Eine Anwendung für die Schweiz

    OpenAIRE

    Stefan Felder

    1997-01-01

    The stance of fiscal policy is commonly assessed by the size of the annual budget deficit and public debt. Both indices fail, however, to correctly reflect the long run financial burden of government programs such as social security. An alternative to "deficit accounting" is "generational accounting" which in particular reveals the intergenerational distribution effect of government legislation. The present paper applies generational accounting on the pay-as-you-go financed part of old age pe...

  2. Fundamentals of ecology. Vol. 2. Grundlagen der Oekologie. Bd. 2. Standorte und Anwendung

    Energy Technology Data Exchange (ETDEWEB)

    Odum, E P

    1980-01-01

    The following topics are discussed: freshwater flora and fauna; marine ecosystems; shelf, krill, mangroves, and coral reefs; terrestrial biota and biogeographic regions; deciduous wood, grassland, desert; microbial-ecological perspectives: taxonomy, efficiency, turnover; aquaculture, agriculture, forestry; types, cost, and phases of environmental pollution; specific population ecology of humans.

  3. Hacia la predicción del Número R de Wolf de manchas solares utilizando Redes Neuronales con retardos temporales

    Science.gov (United States)

    Francile, C.; Luoni, M. L.

    We present a prediction of the time series of the Wolf number R of sunspots using "time lagged feed forward neural networks". We use two types of networks: the focused and distributed ones which were trained with the back propagation of errors algorithm and the temporal back propagation algorithm respectively. As inputs to neural networks we use the time series of the number R averaged annually and monthly with the method IR5. As data sets for training and test we choose certain intervals of the time series similar to other works, in order to compare the results. Finally we discuss the topology of the networks used, the number of delays used, the number of neurons per layer, the number of hidden layers and the results in the prediction of the series between one and six steps ahead. FULL TEXT IN SPANISH

  4. Photovoltaic generator. Estimate of the energy produced by neural networks; Generador fotovoltaico. Estimacion de la energia producida mediante redes neuronales

    Energy Technology Data Exchange (ETDEWEB)

    Almonacid, F.; Rus, C.; Perez-Higueras, P.; Hontoria, L.

    2010-07-01

    Despite the great technological advances in photovoltaic and in particular in network-connected systems, efforts are still required in research, technological development and innovation (i + d + i) must be aimed primarily at addressing the different system parts. one aspect that can help achieve this goal is majorette estimation methods of energy produced by photovoltaic generators. There are a number of cases resulting in a decrease of the expected energy. In this paper we will compare a standard method widely used in the estimation of the power of the photovoltaic generator with another novel method, developed at the University of Jaen, based on artificial neural networks (ANN). (Author) 9 refs.

  5. Optimization of operation cycles in BWRs using neural networks; Optimizacion de ciclos de operacion en BWRs usando redes neuronales

    Energy Technology Data Exchange (ETDEWEB)

    Ortiz S, J. J.; Castillo, A. [ININ, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico); Alejandro P, D., E-mail: juanjose.ortiz@inin.gob.mx [Universidad de Granada, ETS de Ingenierias, Informatica y de Telecomunicacion, C/Daniel Saucedo Aranda s/n, 18071 Granada (Spain)

    2011-11-15

    The first results of a system for the optimization of operation cycles in boiling water reactors by means of a multi state recurrent neural network are present in this work. The neural network finds the best combination of fuel cells; fuel reloads and control bars patterns previously designed, according to an energy function that qualifies the performance of the three partial solutions for the solution of the whole problem. The partial solutions are designed by means of optimization systems non couple among them and that can use any optimization technique. The phase of the fuel axial design is not made and the size of the axial areas is fixed during the optimization process. The methodology was applied to design a balance cycle of 18 months for the reactors of the nuclear power station of Laguna Verde. The results show that is possible to find combinations of partial solutions that in set represent good solutions to the complete design problem of an operation cycle of a nuclear reactor. The results are compared with others obtained previously by other techniques. This system was developed in platform Li nux and programmed in Fortran 95 taking advantage of the 8 nuclei of a work station Dell Precision T7400. (Author)

  6. Aplicación de las redes neuronales artificiales para la estratificación de riesgo de mortalidad hospitalaria

    Directory of Open Access Journals (Sweden)

    Trujillano J.

    2003-01-01

    Full Text Available Objetivo: Comparar la capacidad de predicción de mortalidad hospitalaria de una red neuronal artificial (RNA con el Acute Physiology and Chronic Health Evaluation II (APACHE II y la regresión logística (RL, y comparar la asignación de probabilidades entre los distintos modelos. Método: Se recogen de forma prospectiva las variables necesarias para el cálculo del APACHE II. Disponemos de 1.146 pacientes asignándose aleatoriamente (70 y 30% al grupo de Desarrollo (800 y al de Validación (346. Con las mismas variables se genera un modelo de RL y de RNA (perceptrón de 3 capas entrenado por algoritmo de backpropagation con remuestreo bootstrap y con 9 nodos en la capa oculta en el grupo de desarrollo. Se comparan los tres modelos en función de los criterios de discriminación con el área bajo la curva ROC (ABC [IC del 95%] y de calibración con el test de Hosmer-Lemeshow C (HLC. Las diferencias entre las probabilidades se valoran con el test de Bland-Altman. Resultados: En el grupo de validación, el APACHE II con ABC de 0,79 (0,75-0,84 y HLC de 11 (p = 0,329; modelo RL, ABC de 0,81 (0,76-0,85 y HLC de 29 (p = 0,0001, y en RNA, ABC de 0,82 (0,77-0,86 y HLC de 10 (p = 0,404. Los pacientes con mayores diferencias en la asignación de probabilidad entre RL y RN (8% del total son pacientes con problemas neurológicos. Los peores resultados se obtienen en los pacientes traumáticos (ABC inferior a 0,75 en todos los modelos. En los pacientes respiratorios, la RNA alcanza los mejores resultados (ABC = 0,87 [0,78-0,91]. Conclusiones: Una RNA es capaz de estratificar el riesgo de mortalidad hospitalaria utilizando las variables del sistema APACHE II. La RNA consigue mejores resultados frente a RL, sin alcanzar significación, ya que no trabaja con restricciones lineales ni de independencia de variables, con una diferente asignación de probabilidad individual entre los modelos.

  7. Axial design of fuel for BWRs using neural networks; Diseno axial de combustible para BWRs usando redes neuronales

    Energy Technology Data Exchange (ETDEWEB)

    Ortiz, J.J.; Castillo, A.; Montes, J.L.; Perusquia, R. [ININ, Carretera Mexico-Toluca s/n, 52750 La Marquesa, Ocoyoacac, Estado de Mexico (Mexico)]. e-mail: jjortiz@nuclear.inin.mx

    2007-07-01

    In this work a new system of axial optimization of fuel is presented based on a recurrent multi state neural net called RENODC. They are described with detail the main characteristics of this type of neural net (architecture, energy function and actualization of neural states) and like was adapted to the assemble design of nuclear fuel. The fuel design is proven by means of a fuel recharge and pre determined control rod patterns. By this way a good axial fuel design one has, when the thermal limits are fulfilled along the cycle, the reactor stays critic and at least the wanted longitude of the cycle is reached; also the margin of in cold turned off is verified. The assemble of fuel created with RENODC it is substituted by a recharge assemble and it is sought to verify that the energy requirements and aspects of safety are completed. The used cycle corresponds to a balance cycle of 18 months that it can be applied to the Laguna Verde Nucleo electric Central. The tests demonstrate the effectiveness of the system to reach satisfactory results in times of CPU of around 4 hours. This way, it could be proven that the design proposed with a lightly superior enrichment to that of the substituted design, fulfills the energy requirements. In later stages of this project this system will be coupled to the other optimization modules that are already had. (Author)

  8. Modelos de precios de los activos: un ejercicio comparativo basado en redes neuronales aplicado al mercado de valores colombiano

    Directory of Open Access Journals (Sweden)

    Charle Augusto Londoño Henao

    2011-12-01

    Full Text Available This study seeks to evaluate the effectiveness that variables like firm size and book-to-market ratio—present in the model of Fama and French—have to capture the average expected return on assets, ascompared to macroeconomic fundamentals or the market index. For this purpose, we used an artificial neural network model (ANN, which departs from a structure of non-linear estimation to capture some irregularities that characterize financial markets. We found that the Fama and French model accounts for the conditions of the Colombian stock market better, which suggests the importance of microeconomic risk factors to explain asset returns.

  9. Diagnóstico de averías de un cambiador de tomas en carga mediante redes neuronales

    OpenAIRE

    Piñas García, Miguel Ángel

    2010-01-01

    Un cambiador de tomas en carga por sus siglas en español CTC u OLTC por sus siglas en inglés (“On-Load Tap Changer”) es la única parte con movimiento en un transformador. Su Misión es realizar la operación de cambio de una toma a otra del devanado de regulación, modificando el número de espiras en uno de los devanados, en respuesta a un cambio de tensión en la red debido a variaciones en la carga. De acuerdo a una encuesta internacional realizada por el CIGRE el 40% de los fallos del transfor...

  10. Optimization of patterns of control bars using neural networks; Optimizacion de patrones de barras de control usando redes neuronales

    Energy Technology Data Exchange (ETDEWEB)

    Mejia S, D.M. [IPN, ESFM, Depto. de Ingenieria Nuclear, 07738 Mexico D.F. (Mexico); Ortiz S, J.J. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)]. e-mail: dulcema6715@hotmail.com

    2005-07-01

    In this work the RENOPBC system that is based on a recurrent multi state neural network, for the optimization of patterns of control bars in a cycle of balance of a boiling water reactor (BWR for their initials in English) is presented. The design of patterns of bars is based on the execution of operation thermal limits, to maintain criticizes the reactor and that the axial profile of power is adjusted to one predetermined along several steps of burnt. The patterns of control bars proposed by the system are comparable to those proposed by human experts with many hour-man of experience. These results are compared with those proposed by other techniques as genetic algorithms, colonies of ants and tabu search for the same operation cycle. As consequence it is appreciated that the proposed patterns of control bars, have bigger operation easiness that those proposed by the other techniques. (Author)

  11. Neuronal Adaptations during Amygdala-Dependent Learning and Memory : Neuronale aanpassingen tijdens Amygdala-afhankelijk leren en geheugen

    NARCIS (Netherlands)

    B.S. Hosseini (Behdokht)

    2016-01-01

    textabstractThe amygdala, a structure deep in the temporal lobe of the brain, is an essential region for emotional and fearful processing. Neuronal coding in the lateral nucleus of the amygdala (LA) endows the brain with the ability to acquire enduring aversive associations, physically represented

  12. Neuronale Korrelate sozialer Interaktion beim Menschen und deren genetische Modulation unter besonderer Berücksichtigung des Spiegelneuronensystems

    OpenAIRE

    Cordes, Andrea

    2013-01-01

    Die in vielen Lebenssituationen über Erfolg und Misserfolg, Sympathie und Antipathie entscheidende, unterschiedlich ausgeprägte Fähigkeit zur sozialen Interaktion ist Gegenstand neurowissenschaftlicher Untersuchungen. Die Versuche einer kortikalen Lokalisierung führten zur Beschreibung des Spiegelneuronensystems (SNS) in Hirnregionen, die sowohl beim Ausführen einer Aktion Aktivität zeigten als auch beim Beobachten derselben beim Gegenüber. Die stärkste Aktivierung dieser Areale wurde bei sch...

  13. Evolutionary neural networks: a new alternative for neutron spectrometry; Redes neuronales evolutivas: una nueva alternativa para la espectrometria de neutrones

    Energy Technology Data Exchange (ETDEWEB)

    Ortiz R, J. M. [Departamento de Electrotecnia y Electronica, Escuela Politecnica Superior, Av. Menendez Pidal s/n, 14004 Cordoba (Spain); Martinez B, M. R.; Vega C, H. R. [Unidad Academica de Estudios Nucleares, Universidad Autonoma de Zacatecas, Cipres 10, Fracc. La Penuela, 98068 Zacatecas (Mexico); Galleo, E. [Departamento de Ingenieria Nuclear, Universidad Politecnica de Madrid, Jose Gutierrez Abascal 2, 28006 Madrid (Spain)], e-mail: morvymm@yahoo.com.mx

    2009-10-15

    A device used to perform neutron spectroscopy is the system known as a system of Bonner spheres spectrometer, this system has some disadvantages, one of these is the need for reconstruction using a code that is based on an iterative reconstruction algorithm, whose greater inconvenience is the need for a initial spectrum, as close as possible to the spectrum that is desired to avoid this inconvenience has been reported several procedures in reconstruction, combined with various types of experimental methods, based on artificial intelligence technology how genetic algorithms, artificial neural networks and hybrid systems evolved artificial neural networks using genetic algorithms. This paper analyzes the intersection of neural networks and evolutionary algorithms applied in the neutron spectroscopy and dosimetry. Due to this is an emerging technology, there are not tools for doing analysis of the obtained results, by what this paper presents a computing tool to analyze the neutron spectra and the equivalent doses obtained through the hybrid technology of neural networks and genetic algorithms. The toolmaker offers a user graphical environment, friendly and easy to operate. (author)

  14. Estudio de dos estructuras neuronales feedforward para la compresión de imágenes digitales

    Directory of Open Access Journals (Sweden)

    Andrés Eduardo Gaona Barrera

    2012-01-01

    Full Text Available This paper shows and explains the process implemented for the development of feed- forward neural networks with the aim of compress digital image color. It sets oul sorne traditional techniques and develops tvvo topologies to implement feed forward. During the development of networks, fue items that are considered: number of layers, number of neurons, image type, size and munber of blocks to train, to optimize performance during final training. It also discusses the standard quality of the image obtained, as peak signal noise relation (PSNR and cornpression, which typically obtain values above 35dB in terms of PSNR and 2 bits per pixel in gray or 3 bpp color images, with maximum time of 3 seconds for images less than I mega pixel. Finally out some dravvbacks and presents conclusions of this type of compression.

  15. Análisis de la calidad del servicio en el transporte público mediante redes neuronales artificiales

    OpenAIRE

    Garrido Rodriguez, Maria; DE OÑA LOPEZ, JUAN JOSE

    2016-01-01

    [ES] El éxito de un servicio de transporte público reside en su capacidad para captar nuevos pasajeros y de fidelizar el uso de los actuales. De ahí que las administraciones y los gestores de transporte se preocupen cada vez más por conocer cuál es la calidad percibida por los usuarios. Aunque existen numerosos métodos matemáticos que ya han sido utilizados para analizar la calidad del servicio en el transporte público, es necesario seguir avanzando en el estudio de nuevas técn...

  16. Actividad solar del ciclo 23. Predicción del máximo y fase decreciente utilizando redes neuronales

    Science.gov (United States)

    Parodi, M. A.; Ceccatto, H. A.; Piacentini, R. D.; García, P. J.

    Different methods have been proposed in order to predict the maximum amplitude of solar cycles, either as a consequence of the intrinsic importance of this event and because of its relation with solar storms and possible effects upon satellites, communication systems, etc. In this work, a neural network solar activity prediction is presented, measured through the sunspot number (SSN). The 16-units neural network, with a 12:3:1 architecture, was trained in a ``feed-forward" propagation way and learning by the so called ``back propagation rule". The annual mean SSN data in the 1700-1975 and 1987-1998 periods were used as the training set. The solar cycle 21 (1976-1986) was taken as the cross-validation data set. After performing the network training we obtained a prediction of the maximum annual mean for the current solar cycle 23, SSNmax= 135 ±17 at the year 2000, which is 13% smaller than the International Consensus Commitee's mean maximum prediction obtained through ``precursor techniques". On the other hand, our prediction is only about 4% smaller than the Consensus's neural network mean prediction. A ``multiple step" prediction technique was also performed and SSN annual mean predicted values for the near-maximum (from the present year 1999 to beyond the maximum) and the declining activity of solar cycle 23 are presented in this work. The sensibility of predictions is also tested. To do so, we changed the interval width and comparated our results with those of a previous neural network prediction and those of others authors using differents methods.

  17. Redes neuronales artificiales para la predicción de la calidad en soldadura por resistencia por puntos

    Directory of Open Access Journals (Sweden)

    Martín, O.

    2006-10-01

    Full Text Available An artificial neural network is proposed as a tool for predicting from three parameters (weld time, current intensity and electrode sort if the quality of a resistance spot weld reaches a certain level or not. The quality is determined by cross tension testing. The fact of reaching this quality level or not is the desired output that goes with each input of the artificial neural network during its supervised learning. The available data set is made up of input/desired output pairs and is split randomly into a training subset (to update synaptic weight values and a validation subset (to avoid overfitting phenomenon by means of cross validation.

    Se propone una red neuronal artificial como herramienta para predecir, a partir de tres parámetros operativos (tiempo de soldadura, intensidad de corriente y tipo de electrodo, si la calidad de una unión soldada por resistencia por puntos alcanza o no un cierto nivel. El entrenamiento de la red neuronal conlleva que la calidad se determine previamente mediante ensayos de tracción en probetas en cruz. El hecho de alcanzar o no el citado nivel de calidad constituye la respuesta objetivo que acompaña a cada entrada de la red neuronal artificial durante su aprendizaje supervisado. El conjunto de datos disponible está formado por pares entrada/salida objetivo y se divide de forma aleatoria en un subconjunto de entrenamiento (para actualizar los valores de los pesos sinápticos y en un subconjunto de validación (para combatir el fenómeno de overfitting mediante validación cruzada.

  18. Propuesta didáctica para modelizar evapotranspiración de referencia con redes neuronales artificiales en el aula.

    Directory of Open Access Journals (Sweden)

    Pau Martí

    2015-07-01

    Además de aprender a usar esta herramienta en una aplicación concreta dentro de su campo de competencias profesionales futuras, el alumno toma contacto con líneas actuales de investigación en el campo de la ingeniería del riego y se promueven eventuales colaboraciones de investigación.

  19. Proliferación de las células no neuronales del ganglio ciliar en cultivos in vitro

    OpenAIRE

    Padilla-Alvarez, F.; Alcaín Tejada, F.J.; Bustos Ruiz, M.

    1981-01-01

    In our investigations, non-neuron cells from ciliary ganglion of chick embryos (8 days-old), were cultured on tissue culture plastic dis¬hes, using as culture media heart-conditioned medium (HCM), HCM supple¬mented "with glucose (HCMC) and with phytohemagglutinin (PHA) added to HCM (HCMPHA). The low rate of proliferation observed in these ceil.s in ovo, per¬sists when the cells are cultured in vitro. The higest index of ,proliferation is obtained by using HCM as cultu re medium. We observed t...

  20. Function and application of ammonia-water adsorption refrigeration cycles; Funktion und Anwendung von Ammoniak-Wasser-Absorptionskaeltemaschinen

    Energy Technology Data Exchange (ETDEWEB)

    Heyse, Christoph; Stuerzebecher, Wolfgang [Tranter Solarice GmbH, Artern (Germany); Cibis, Dominik [Europaeische Studienakademie Kaelte-Klima-Lueftung, Maintal (Germany)

    2012-07-01

    The pursuit of the nations for more energy efficiency and environmentally friendly handling of nature and its resources is growing steadily. This new dimension of environmental awareness led to the fact that Germany has set the goal to become one of the most energy efficient and environmentally friendly economies of the world. Inter alia research and development in the areas of energy efficiency and renewable energy benefit from this. The meanwhile strongly forgotten potential of absorption chillers used for more than 150 years was due to rising energy costs and the rethinking in dealing with existing energy sources, newly discovered. The application of absorption chillers can be found everywhere, where a lot of heat is released unused into the environment. The implementation of the absorption refrigeration technology in power systems can have enormous energetic and thus ecological and economical benefits. Currently, mainly gas-fired cogeneration units whose main purpose is the generation of electricity can be used as heat sources. Particularly versatile is the application of NH{sub 3}-H{sub 2}O absorbers where heating temperatures are located at 100 Celsius and cooling temperatures up to -10 Celsius are needed, for example for air conditioning of buildings, cooling of food-stuff or for process cooling. The contribution under consideration reports on an overview of the working principle of ammonia water absorption chillers and presents various applications and uses in line with a combined power-heat-coldness coupling.

  1. S2k-Leitlinie zum Gebrauch von Präparationen zur lokalen Anwendung auf der Haut (Topika).

    Science.gov (United States)

    Wohlrab, Johannes; Staubach, Petra; Augustin, Matthias; Eisert, Lisa; Hünerbein, Andreas; Nast, Alexander; Reimann, Holger; Strömer, Klaus; Mahler, Vera

    2018-03-01

    Diese Leitlinie richtet sich an Assistenz- und Fachärzte der Dermatologie sowie an Kostenträger und politische Entscheidungsgremien. Die Leitlinie wurde im formellen Konsensusverfahren (S2k) von Dermatologen unter Einbindung von Apothekern erstellt. Die Leitlinie stellt allgemeine Aspekte der Pharmakokinetik sowie der regulatorischen Begrifflichkeiten dar. Es werden Empfehlungen zur Indikation von Magistralrezepturen sowie deren Qualitätssicherung gegeben. Die Bedeutung der galenischen Grundlagen und die Problematik bei einer Substitution gegeneinander verschiedener Grundlagen werden dargestellt. Die Leitlinie umfasst Kriterien zur Auswahl einer adäquaten Grundlage sowie spezifische Aspekte zur Therapieplanung. Die Leitlinie gibt Empfehlungen zum Management bei Unverträglichkeiten gegenüber Bestandteilen der Grundlagen oder Hilfsstoffe. © 2018 The Authors | Journal compilation © Blackwell Verlag GmbH, Berlin.

  2. PET and SPECT investigations in Alzheimer's disease; Nuklearmedizin und Demenz - Anwendung bei Morbus Alzheimer

    Energy Technology Data Exchange (ETDEWEB)

    Asenbaum, S. [Universitaetsklinik fuer Nuklearmedizin, Universitaetsklinik fuer Neurologie, Wien (Austria); Abteilung fuer klinische Neurologie, Universitaetsklinik fuer Neurologie, Waehringer Guertel 18-20, 1090, Wien (Austria)

    2003-07-01

    Nuclear medicine offers a wide range of possibilities to investigate dementia. Various SPECT and PET tracers will be introduced in this article first. Different questions concerning evaluation of dementia are discussed taking Alzheimer's disease (AD) as an example. It is important to perform nuclear medicine investigations on high technical level, using standardized methods as statistical parametric mapping (SPM) for evaluation. If neuroprotective therapies are available, an early diagnosis, the determination of risk factors and longitudinal investigations will be the focus of interest and the main goal of nuclear medicine. Apart from measuring cerebral perfusion and glucose metabolism the development of new ligands, concerning the cholinergic system and the visualization of amyloid plaques, is of great importance. (orig.) [German] Nuklearmedizin bietet bei der Erfassung und Beurteilung eines dementiellen Prozesses eine Vielzahl von Untersuchungsmoeglichkeiten. Anhand des Morbus Alzheimer (DAT) werden in dem vorliegenden Artikel neben einer kurzen Schilderung der zur Verfuegung stehenden Methoden die verschiedenen nuklearmedizinisch relevante Fragestellungen angefuehrt, zu deren Beantwortung die funktionelle Bildgebung Informationen liefern kann. Durch den Einsatz bestimmter, standardisierter Auswerteverfahren wie statistical parametric mapping (SPM) ist es moeglich, entscheidende Hinweise zur Diagnose und Differenzialdiagnose der DAT zu erlangen. In Zukunft werden, insbesondere bei einer Verfuegbarkeit neuroprotektiver Therapien, eine moeglichst fruehe Diagnosestellung und die Erfassung von Risikofaktoren sowie die Moeglichkeit einer Verlaufsbeobachtung in den Mittelpunkt des Interesses und in das Zentrum nuklearmedizinischer Untersuchungen ruecken. Vor allem fuer diese Anforderungen ist neben der qualitaetsvollen Untersuchung von zerebraler Perfusion und Glukosestoffwechsel eine Weiterentwicklung spezieller Liganden v. a. das cholinerge System betreffend und eine Markierung der Amyloidplaques vonnoeten. (orig.)

  3. Die häufigsten Fehler bei der FMEA-Anwendung und wie ich sie vermeiden kann

    OpenAIRE

    Schloske, Alexander

    2010-01-01

    Die FMEA stellt heutzutage eines der wichtigsten Werkzeuge des präventiven Risikomanagements dar. Die universell anwendbare Vorgehensweise des VDA hat sich dabei in der Industrie etabliert. Der Beitrag beschreibt aus der Sicht von 20 Jahren FMEA-Erfahrung, wie die FMEA zielführend erstellt wird und mit welchen Tipps und Tricks eine effiziente und effektive FMEA-Erstellung ermöglicht wird.

  4. Application and processing of paints hardened by electron beams. Anwendung und Verarbeitung von EB-haertenden Lacken

    Energy Technology Data Exchange (ETDEWEB)

    1984-01-01

    Electron beam hardening is a process for changing liquid surface coatings of different thicknesses by irradiation with electrons of high energy into solid, hard, elastic films. In contrast to the UV process, one can harden pigmented paints with electron beams. An electron accelerator, which remits free electrons is used as the energy source for starting the chemical reaction in the coating material. In order to irradiate flat parts, which were coated with liquid paint by rolling, pouring or spraying, equally with electrons, one must produce an electron curtain, similar to that in a paint pouring machine.

  5. Investigations on generation and use of a sludge-lime fertilizer. Untersuchungen zur Erzeugung und Anwendung eines Klaerschlamm-Kalkduengers

    Energy Technology Data Exchange (ETDEWEB)

    Boehnke, B; Weiling, R

    1980-06-01

    Sludge is an important energy and raw material source, which if possible should be utilized in agriculture. Through the addition of unslaked lime a hygienically safe product can be prepared with the help of a suitable treatment process and can be offered in granulated form as a valuable sludge-lime fertilizer. Sludges of different consistencies and origins were investigated. Varying amounts and types of lime were used and the products were tested for easy handling, storage capability and temperature influence on the hygienic conditions. In order to obtain a disseminable substance, a solid matter content of over 60% is necessary. This is achieved through variation of the lime content depending on the solid content of the respective sludge. According to the existing regulations, which fix the minimum CaO content in a lime fertilizer at 30%, a predewatering of the sludge up to 25%-30% of the solid matter content is sufficient. Economic viability is assured, specially in areas where intensive agricultural use of lime fertilizer is necessary. (orig.) With 32 refs., 15 tabs., 27 figs.

  6. Practical application of insect-parasitic nematodes and sterile flies; Praktische Anwendung insektenparasitischer Nematoden und sterilisierter Fliegen

    Energy Technology Data Exchange (ETDEWEB)

    Galle, F. [Bayerisches Staatsministerium fuer Ernaehrung, Landwirtschaft und Forsten, Muenchen (Germany); Loosjes, M. [De Groene Vlieg, Nieuwe Tonge (Netherlands)

    1987-07-01

    The company 'de Groene Vlieg' started with commercial control of the onion fly by means of the sterile insect technique. At the moment 10 per cent of the Dutch spring sown onions are treated with this method. The mass-rearing, the estimations of populations and the repeated releases of sterilized flies make it a rather complicated method. It can be applied economically per field, but only in areas with a concentration of onion growing. For export we see no possibilities yet. In principle the sterile insect technique can be applied also to other flies (carrot rust fly, cabbage root fly), but a suitable artificial diet is still lacking. Since some years we also rear the insect parasitic nematodes Heterorhabditis sp. and Neoaplectana bibionis. The later is experimentally used with success against Agrotis segetum caterpillars in lettuce. Research will yield more applications of nematodes against different pests. We use Heterorhabditis sp. in practice against the black vine weevil (Otiorhynchus sulcatus), a serious pest in glass houses, tree nurseries and gardens. Good control is achieved with a dose of one half to one million nematodes per square meter in moist soil and with temperatures above 12 degrees C. The application is similar to that of a chemical insecticide. The pest is killed by symbiontic bacteria, released by the nematodes after penetrating into the body cavity of the larvae. The nematodes are delivered by mail. If cooled they can be kept alive for over four weeks in the package. We export already to Switzerland and plan to export also to Western Germany. At this moment a possible admittance is under investigation in the Netherlands for application of a nuclear polyhedrosis virus against Spodoptera exigua caterpillars.

  7. Anwendung des Traumatherapieverfahrens -Narrative Expositionstherapie- bei komplex traumatisierten Patienten unter besonderer Berücksichtigung des Schlafes

    OpenAIRE

    Scharff, Anna-Lena

    2016-01-01

    Die Studie sollte aufgrund der häufigen Komorbidität einer Posttraumatischen Belastungsstörung mit der Borderline Persönlichkeitsstörung die Frage untersuchen, ob die Narrative Expositionstherapie einen Therapieerfolg bei komplex traumatisierten Patienten hat. Desweiteren sollte der Effekt der Therapie auf den Schlaf untersucht werden und eventuell prädiktive Zusammenhänge zwischen Schlafqualität und Therapieerfolg herausgestellt werden.

  8. Effects of platinum in biological systems - toxicology and pharmaceutical applications; Wirkungen von Platin in biologischen Systemen - Toxikologie und pharmazeutische Anwendung

    Energy Technology Data Exchange (ETDEWEB)

    Nachtigall, D [Fraunhofer-Institut fuer Toxikologie und Aerosolforschung, Hannover (Germany)

    1998-12-31

    The title of this lecture has intentionally been worded rather vaguely with ``biological systems`` to do justice to the fact that there are meanwhile extensive data available on diverse levels of the toxicology and structure-effect relationships of some platinum compounds. These range from epidemiological descriptions over toxicity studies to molecular biological reaction mechanisms. Any discussion on the toxicity of a substance implies that the substance poses a direct or indirect hazard to humans. In the case of platinum and its compounds there are three main categories of exposure: platinum production including workplaces in the platinum processing industries; clinical treatment with antineoplastic platinum-containing agents; and, finally, the environment, where platinum levels are known to be rising since some years. The association between these exposures becomes clear when one considers the platinum pollution caused by automobile catalytic converters, hospital effluents, and by platinum-containing industrial products in the widest sense. [Deutsch] Der Titel des Vortrages ist mit `biologischen Systemen` sehr allgemein gehalten, da ueber die Toxikologie und die Struktur-Wirkungsbeziehungen einiger Platinverbindungen auf den verschiedensten Ebenen umfangreiche Daten vorliegen. Diese reichen von epidemiologischen Beschreibungen ueber Toxizitaetsstudien bis hin zu molekularbiologischen Reaktionsmechanismen. Die Diskussion um die Toxizitaet von Substanzen impliziert immer die direkte oder indirekte Gefaehrdung des Menschen. Im Falle des Platins und seiner Verbindungen existieren drei wesentliche Expositionsbereiche: Die Platingewinnung sowie die Arbeitsplaetze in der Platin verarbeitenden Industrie, die klinische Behandlung mit antineoplastischen Platinwirkstoffen und schliesslich die Umwelt, in der seit einigen Jahren ansteigende Platinkonzentrationen verzeichnet werden. Die Verbindung zwischen diesen Bereichen wird deutlich, wenn man die Platinimmissionen durch Automobilkatalysatoren, durch Krankenhausabwasser und im weitesten Sinne durch platinhaltige Industrieprodukte beachtet. (orig.)

  9. TRANSLATION ACQUISITION, TRANSLATION COMPERISON AND IST USAGE IN FOREIGN LANGUAGE COURSES UBERSETZUNGSFERTIGKEIT, UBERSETZUNGSVERGLEICH UND IHRE ANWENDUNG IM FREMDSPRACHENUNTERRICHT

    Directory of Open Access Journals (Sweden)

    Prof. Dr. Zeki KARAKAYA

    2009-05-01

    Full Text Available The purpose of this study is to enlighten the definition of translation acquisition, the differentiation from language acquisition by comparing translations of two authors having translation acquisition in different levels and through using these differences how can it be used in language teaching.In the first section, translation acquisition issue has been accentuated; by giving place to the definitions of different Scientifics a general survey about translation acquisition has been elicited. Moreover, in this section, in order to see how translation acquisition will be differentiated from language acquisition and bring out the difference; an application has been conducted on Students and the results have been ascertained.As it is known, translation comparison is a appliance for bringing in language teaching, comparative linguistics, comparative graphology, translation criticism and translation acquisition. However, in this study it has been tried out representing some suggestions and examples about translation on the subject of how can be benefited only in language teaching with translation comparison which is one of the medium of methodology. In the study comparative translation method has been applied and examples and suggestions about its functions on language teaching have been presented. Bu çalışmanın amacı çeviri edincinin tanımına, dil edincinden ayrışımına, farklı düzeylerde çeviri edincine sahip iki yazarın çevirilerinin karşılaştırılmasıyla bu farklılıklardan yararlanarak nasıl dil öğretiminde kullanılabileceğine ışık tutmaktır.İlk bölümde çeviri edinci konusu üzerine durulmuş, farklı bilim adamlarının tanımlarını yer vererek, çeviri edincine yönelik genel bir bakış sağlanmıştır. Ayrıca bu bölümde çeviri edincinin dil edincinden nasıl ayırt edileceğini görmek, aradaki farkı göz önüne sermek için öğrencilerle uygulama yapılmış ve sonuçları tespit edilmiştir. Bilindiği gibi çeviri karşılaştırması dil öğretimi, karşılaştırmalı dilbilim, karşılaştırmalı yazınbilim, çeviri eleştirisi ve çeviri edinci kazandırmak için kullanılan bir araçtır. Ancak bu çalışmada çeviri yöntembilimsel araçlarından biri olan çeviri karşılaştırmasıyla sadece dil öğretimi alanında nasıl yararlanılabilir konusunda bazı öneriler ve örnekler sunulmaya çalışılmıştır. Bu çalışmada karşılaştırmalı çeviri yöntemi uygulanmış olup dil öğretimindeki işlevine dair örnek ve öneriler sunulmuştur.

  10. Selective Catalytic Reduction (SCR) for mobile application - heavy duty diesel; Selektive Katalytische Reduktion (SCR) fuer die mobile Anwendung - LKW

    Energy Technology Data Exchange (ETDEWEB)

    Huennekes, E.; Neubauer, T. [Engelhard Technologies GmbH, Hannover (Germany); Roth, S.A.; Patchett, J.A. [Engelhard Corp., R and D, Iselin, NJ (United States)

    2006-07-01

    Different system configurations of particulate and NOx control via selective catalytic reduction (SCR) were discussed. Advantages and disadvantages were described and the final choice of the optimum system will strongly depend on the application, the market (US, EU) and the system costs. Especially when considering low temperature NOx control, the optimum adjustment of the NO{sub 2}/NO{sub x} ratio in front of an SCR system plays an important role. When generating NO2 over an oxidation catalyst, the resulting NO{sub 2}/NO{sub x} ratio strongly depends on temperature and space velocity. Steady state data show an optimum NO{sub 2}/NO{sub x} ratio between 35 and 60% at temperatures about 240 C. Three DOC systems in front of an SCR system were investigated with the purpose to generate high, low and optimum NO{sub 2}/NO{sub x} ratios. The fast SCR reaction at 1:1 NO: NO2 with NH{sub 3} is the preferred reaction pathway until either NO or NO{sub 2} are consumed. The benefit of an optimum designed DOC system can be seen in the transient response after a sudden increase in urea dosing. The time for the optimum designed system to reach maximum NO{sub x} conversion is much shorter compared with systems having excess NO or NO{sub 2} Ammonia oxidation catalysts (AMOX) are effective means in controlling ammonia from SCR systems. To be effective, AMOX must have selectivity to nitrogen over N{sub 2}O and NO{sub x}. (orig.)

  11. Field-effect gas sensors and their application in exhaust treatment systems; Feldeffekt-Gassensoren und ihre Anwendung in Abgasnachbehandlungssystemen

    Energy Technology Data Exchange (ETDEWEB)

    Schalwig, Jan

    2002-07-01

    Tightening environmental constraints on exhaust gas emissions of gasoline and Diesel engines led to a growing interest in new and highly sophisticated gas sensors. Such sensors will be required in future exhaust gas aftertreatment systems for the selective real time detection of pollutants such as nitric oxides, hydrocarbons and carbon monoxide. Restrictions on cost and device dimensions imposed by the automobile industry make semiconductor gas sensors promising candidates for the realization of cheap and small-size sensor devices. This work deals with semiconductor field effect devices with catalytically active platinum (Pt) electrodes and potential applications of such devices in automotive exhaust gas aftertreatment systems. To allow for continuous operation at high temperatures, silicon carbide (SiC) and group III-nitrides such as GaN and AlGaN were used as semiconductor materials. Different devices have been realized with such materials: SiC based MOS capacitors (MOSiC), GaN Schottky diodes and GaN/AlGaN high electron mobility transistors (HEMT). The principle feasibility of SiC and GaN based field effect gas sensors for automotive applications was tested under laboratory conditions using synthetic gas mixtures. Exhaust gas components such as carbon monoxide (CO), nitric oxides (NO and NO{sub 2}), various saturated and unsaturated hydro-carbons as well as water vapor, oxygen (O{sub 2}) and hydrogen (H{sub 2}) were used as test gases in appropriate concentrations with the sensor devices being operated in a range of temperatures extending from room temperature up to 600{sup o}C. (orig.)

  12. Powertrains 2011. Electronics, mechanics and hydraulics in application; Antriebssysteme 2011. Elektrik, Mechanik und Hydraulik in der Anwendung

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2011-07-01

    Within the VDI/VDE conference at 13th-14th September, 2011 in Stuttgart (Federal Republic of Germany) the following lectures and posters were presented: (1) Sieve printed windings of rotating small drives and their evaluation (P. Braeuer); (2) Variable impedance induction motor - Measurement results of a variable impedance induction motor prototype (H. Gholizad); (3) Utilization of a multiphase winding in a star-polygon hybrid circuit for squirrel asynchronous motors for increasing the energy efficiency - generation of flooding waves of a 6-phase machine with a 3-phase connection (T. Knopik); (4) Virtual development of electric moors - Design of an asynchronous motor for propel drives by means of a numeric optimization and software automation (V. Reinhardt); (5) A hybrid microproduction system driven by piezoactuators and linear motors (C. Hast); (6) MRF actors with minimized standby losses (D. Gueth); (7) Experimental determination of rotor losses in a homopolar magnetic bearing (E. Fleischer); (8) Vibrational condition monitoring of coiler heads of electric large machines (C. Kreischer); (9) Recovery potentials in the electric propulsion technology - ''What is left usable from the energy'' (M. Schumacher); (10) Overall energy balance in the powertrain - The application decides - Energetic analysis of a powertrain (A. Thomas); (11) Optimal dimensioning of an actuator in the mechatronic overall system electric motor - gear - load (M. Lindner); (12) Electric and hydraulic hybrid actuator: Competing and complementary systems (K. Dehnert); (13) Intelligent pump drives - Simulation, condition monitoring, fault diagnosis and energy efficiency (S. Kleinmann); (14) Parametric models of the permanent magnet-synchronous machine (PMSM) under consideration of the impacts of magnetic saturation (F. Mink); (15) Electromagnetic, structure dynamic acoustic FEM simulation of an asynchronous motor for the evaluation of noise emission (J. Wibbeler); (16) Simulation and model based optimization of motion specifications for the transport of granules filled containers in processing machines (J. Holzweissig); (17) Improvement of the positioning accuracy of a parallel structure using static precontrol model (M. Wahle); (18) The synergism of bearing technology and direct drives using precision rotary axes in machine tools (J.-O. Hestermann); (19) Mechatronic systems for production machines (G. Schmid); (20) Projection of an automatic assembly system for textile spindles using the regulation DIN EN ISO 13849-1 (S. Barthel); (21) Design of servo drives for fast-running nonlinear gears (R. Blueml); (22) Synergism between comfort, safety and productivity - Trends in packaging machine construction - Intelligent and flexible automation platform simplifies the safety equipment of modular machines (H.B. Bruss); (23) Energy efficient hydraulic gears in association with electric axes - Frequency variable gears with displacement pump (D. Spalinger); (24) Investigation of the magnetic flux density in permanent magnetically excited synchronous machines with external rotors (A. Troeger); (25) The Schaeffler eWheel Drive Beta - first results (R. Fischer); (26) SINAMICS S 120 CM Application Shaft Generator Drive for energy efficient and reliable marine systems - applicative solutions based on industrial drive technology (Y. Guenduez); (27) Design and prove of concept of an innovative active fluid suspension system (T. Bedarff); (28) Simulation of hybrid vehicle propulsion with an advanced suspension system (S. Nallabolu); (29) Electrified single-wheel drive for agricultural machines (M. Geissler); (30) Vibrational excitation with electromagnetic drive systems (D. Wiedemann); (31) Control of a double generator with distribution gearbox and two synchronous machines - Design and control of a cost-efficient generator system for the regenerative power generation (C. Fraeger); (32) Interior cooling of permanent magnetically excited external rotor machines using a small wind energy generator as an example (S. Miersch); (33) Development of a kinetic energy storage for regeneratively generated power in buildings (H. Schaede).

  13. Mord, Selbstmord und Anomie : ein neuer Ansatz zur Operationalisierung und empirischen Anwendung des Anomiekonstruktes von Emile Durkheim

    OpenAIRE

    Mehlkop, Guido; Graeff, Peter

    2006-01-01

    Die Studie stützt sich auf Durkheims Anomietheorie, in der Mord- und Selbstmordraten als soziale Phänomene begriffen werden, die wiederum nur mit anderen sozialen Tatsachen zu erklären sind. Unter dieser soziologischen Perspektive interessiert also nicht das letztliche Motiv des Selbstmörders bzw. Mörders, sondern der Einfluss gesellschaftlicher Verhältnisse. Im Fokus dieser Analyse stehen variierende Mord- und Selbstmordraten zwischen Gesellschaften und über die Zeit hinweg. Verzichtet wird ...

  14. Mediation in matters of environmental policy and industrial project planning. Theory and case reports; Umweltmediation in Theorie und Anwendung

    Energy Technology Data Exchange (ETDEWEB)

    Oppermann, B.; Langer, K.

    2000-07-01

    The guidebook is intended for regional or local decision-making bodies from industry and society, politics and administration involved in the planning, organisation and performance of public hearings in the context of industrial project planning, technology assessment and compliance with environmental policy and requirements. Participation of the public and conflict resolution are essential aspects of the guidebook which is one in a series of existing and planned publications on a variety of issues of public interest. (orig./CB) [German] Im Bereich technik- und umeltrelevanter Planungen werden immer haeufiger neue Formen der Buergerbeteiligung diskutiert. Die Akademie fuer Technikfolgenabschaetzung in Baden-Wuerttemberg hat es sich seit einigen Jahren zur Aufgabe gemacht, innovative Verfahren der diskursiven Verstaendigung und Konfliktloesung zu erproben und weiterzuentwickeln. Es zeigte sich, dass ein grosser Bedarf nach allgemeinverstaendlichen Praxisanleitungen besteht, so dass die Akademie begonnen hat, Praxis-Leitfaeden z.B. fuer regionale und lokale Entscheidungstraeger aus Politik, Verwaltung, Wirtschaft und Gesellschaft zu erarbeiten, als Hilfestellung bei Planung, Organisation und Durchfuehrung der vorgeschriebenen Verfahren. Neben dem vorliegenden Leitfaden sind auch weitere zu anderen Themen schon erschienen oder in Planung. (orig./CB)

  15. Automatische Ableitung und Anwendung von Regeln für die Rekonstruktion von Fassaden aus heterogenen Sensordaten

    OpenAIRE

    Becker, Susanne

    2011-01-01

    3D-Stadtmodelle finden seit einigen Jahren in immer stärkerem Maß und in den verschiedensten Bereichen Verwendung. Sie bilden unter anderem die Grundlage bei Stadtplanungen, für virtuelle Stadtrundgänge oder für die Berechnung von Simulationen. Internetdiensten wie Google Earth oder Microsoft Bing Maps ist es zu verdanken, dass 3D-Darstellungen von Gebäuden mittlerweile auch für eine breite Öffentlichkeit allgegenwärtig sind. Die erhöhte Nachfrage nach 3D-Gebäudemodellen verlangt nach effizie...

  16. Novel bispidine ligands with a possible application in nuclear medicine; Neue Bispidin-Liganden mit potenzieller Anwendung in der Nuklearmedizin

    Energy Technology Data Exchange (ETDEWEB)

    Rudolf, Henning

    2013-10-24

    Due to our current way of life and the environmental influences we are exposed in the industrial nations, cancer diseases turn out to be a more and more serious threat to our civilization. The ongoing research during the last decades leads to a better insight in cancer diseases and enables an earlier recognition of developing carcinoma. The detection of pathological tissue changes at an early stage increases the patients' chances of cure. Magnetic resonance tomography (MRT) and computed tomography (CT) as well as radiopharmaceutically assisted imaging techniques, like positron emission tomography (PET) and scintigraphy are an indispensable clinical tool in the oncological early diagnosis. By the development of multimodality imaging agents that combine the benefits of several imaging techniques, the early recognition of tumors can be more efficient and in consequence a matching therapy can be applied. This thesis deals with the synthesis of novel bispidine based ligands and their transition metal complexes as potential mono- and bimodal imaging agents for a {sup 64}Cu-assisted radiopharmaceutical application in positron emission tomography (PET) and optical imaging (OI). The synthesized ligands L and L{sup OH} are offering the opportunity to build up a ruthenium(II) polypyridine complex by one of the ligand's donor sets, to act as a fluorescence dye for optical imaging (OI), and to coordinate {sup 64}Cu{sup II} by the ligand's vacant cavity for positron emission tomography (PET). The Ru{sup II} complex exhibits two different fluorescence activities with two different lifetimes and only one of the two fluorescences is quenched by subsequent complexation of Cu{sup II}. The calculated Cu{sup II} stability constant of L and L{sup OH} is similar to that of the isomeric ligand N{sub 2}py{sub 2} which has been already evaluated as a {sup 64}Cu-radiotracer. Further transition metal complexes of Fe{sup II}, Fe{sup III} and Mn{sup II} are dealing with interesting structural properties like pentagonal bipyramidal geometries. For the development of stable and uncharged {sup 64}Cu{sup II} complex for positron emission tomography, three cyclic bispidine ligands containing amide donors were synthesized. These bispidine dioxo tetraaza macrocycles represent a new class of highly preorganized cyclic bispidine ligands by fusing the rigid bispidine backbone with the motif of a macrocyclic diamide. Due to the deprotonatable amides, they form stable, uncharged square-planar respectively square-pyramidal Cu{sup II} complexes and show also the stabilization of copper in the oxidation state +III. In evaluation experiments of the bispidine dioxo tetraaza macrocycles for a radiopharmaceutical application as {sup 64}Cu tracer for positron emission tomography, these ligands are showing an efficient radiolabeling with {sup 64}Cu >95% on benefiting timescale (60 min, tops) and a distinct specific activity up to 26 GBq/µmol. In particular the ligand H{sub 2}BBDT features a high stability versus EDTA and in human blood plasma. In radio challenge experiments, merely 8% of transchelation was detected against a 20fold excess of EDTA and nearly no decomplexation in human blood plasma after 48 h. Biodistribution studies in Kyoto-Wistar rats are showing a rapid and nearly complete clearance from blood and normal tissue after 60 min pi (post injection). The Cu{sup II} complex of the methyl propionate functionalized macrocycle H{sub 2}BBDTA-Me offers the opportunity to couple its saponificated methyl propionate linker to biovectors, nanoparticles or fluorescence labels.

  17. Legal aspects of the production and application of radiopharmaceuticals in Germany; Arzeinmittelrechtliche Aspekte der Herstellung und Anwendung von Radiopharmaka

    Energy Technology Data Exchange (ETDEWEB)

    Kuwert, T.; Prante, O. [Universitaetsklinikum, Erlangen (Germany). Nuklearmedizinische Klinik; Meyer, G. [Medizinische Hochschule Hannover (Germany). Klinik fuer Nuklearmedizin

    2009-06-15

    This article deals with the regulation of the production and use of radiopharmaceuticals in Germany. As in other countries, radiopharmaceuticals may be used when licensed by the German equivalent of the Federal Drug Agency or in clinical trials. Furthermore, non-licensed radiopharmaceuticals can be administered to patients for diagnosis when they are produced in the same institution and not more than 20 doses per week and radiopharmaceutical are given. A prerequisite for these three ways of use is the production of the radiopharmaceutical in question according to the guidelines of the good manufacturing practice (GMP) which creates considerable problems for the usually small PET centers installed in the German university hospitals. German law offers a further possibility to apply non-licensed radiopharmaceuticals for clinical purposes: their administration to patients is not forbidden when performed by a physician who produces the substance himself or is at least responsible for its synthesis. This regulation has, however, been met with criticism by government agencies. (orig.)

  18. Waste analysis - uses, problems and new paths in practice; Abfallanalysen - Anwendung, Probleme und neue Wege fuer die Praxis

    Energy Technology Data Exchange (ETDEWEB)

    Rotter, S. [TUEV Hannover/Sachsen-Anhalt (Germany); Kost, T. [Umwelttechnik und Ingenieure GmbH (Germany); Bilitewski, B. [TU Dresden (Germany). Fachgebiet Abfallwirtschaft; Kock, O.; Seeger, H.; Urban, Arndt [Univ. Kassel (Germany). Fachgebiet Abfalltechnik

    2003-09-01

    Waste analytics; sample preparation; combustion behavior; sampling; balances of incineration and pollutants distribution. (orig.) [German] Abfallanalytik; Probenaufbereitung; Brennverhalten; Probenahme; Verbrennungsbilanz und Schadstoffverteilung. (orig.)

  19. Development and application of cryogenic radiometry with hard X-rays; Entwicklung und Anwendung der Kryoradiometrie mit harter Roentgenstrahlung

    Energy Technology Data Exchange (ETDEWEB)

    Gerlach, Martin

    2008-06-06

    To establish cryogenic radiometry with hard X-ray radiation for photon energies of up to 60 keV, a novel type of cavity absorber had to be developed for the cryogenic radiometer SYRES I, which is deployed by the Physikalisch-Technische Bundesanstalt (PTB) as primary standard detector at the electron storage ring BESSY II. This new type of cavity absorber allows for the complete absorption of hard X-ray radiation in combination with an appropriate sensitivity and an adequate time constant for the measurement of synchrotron radiation at BESSY II. As the process of fabrication of different types of absorbers is very time-consuming, the interaction of hard X-ray radiation with different absorber materials and geometries was studied intensively by using the Monte Carlo simulation code Geant4. The accuracy of the simulations was verified comparing them to scattering experiments performed at a wavelength shifter beamline at BESSY II with a calibrated energy dispersive detector. It was shown that Geant4 describes the photo-effect, including fluorescence as well as Compton- and Rayleigh scattering, with high accuracy. The simulations and experiments resulted in a cavity absorber with a gold base 550 {mu}m in thickness and a cylindrical shell made of copper 90 {mu}m in thickness to reduce losses caused by fluorescence and scattered radiation. Monochromatized synchrotron radiation of high spectral purity was then used to calibrate semiconductor photodiodes, which can be used as compact and inexpensive secondary standard detectors, against a cryogenic radiometer, covering the entire photon energy range of three beamlines from 50 eV to 60 keV with relative uncertainties of less than 0.5 %. Furthermore the spatial homogeneity of the spectral responsivity, the transmittance and the linearity of the photodiodes was investigated. Through a direct comparison of the free-air ionization chamber PK100, a primary detector standard of PTB used in dosimetry, and the cryogenic radiometer SYRES I the values of {mu}{sub en}/{rho} for photons in air were determined for the first time experimentally in the hard X-ray range from 10 keV to 60 keV with relative uncertainties of less than 1 %. (orig.)

  20. Anwendung der extrakorporalen Stoßwellentherapie bei kalzifizierender Periathropathia humeroscapularis, Fersensporn und Epicondylitis humeri - Erfahrungsbericht aus dem Wilhelminenspital

    Directory of Open Access Journals (Sweden)

    Feyertag J

    2004-01-01

    Full Text Available Die Stoßwellentherapie wird bei verschiedenen Indikationen, die unter konservativen Therapien schwer zu schwer zu behandeln sind, eingesetzt. Dazu zählen die kalzifizierenden Schultererkrankungen (Tendinitis calcarea, Epicondylitis humeri (EHR und die plantare Fasciitis mit/ohne plantarem Fersensporn (FSP. Berichtet werden die Ergebnisse von 147 Patienten (102 Frauen/45 Männer, mittleres Alter betrug 57,8 Jahre, die mittels einer einmaligen extrakorporalen Stoßwellentherapie (ESWT (Tend. calc. 82 %, FSP 11 % oder EHR 7 % mittels eines HMT-ReflecTron therapiert wurden. Verabreicht wurden im Mittel 1.800 Stoßwellen. Untersucht wurde die subjektive Verbesserung der Schmerzen anhand einer visuellen Analogskala vor und 6 Wochen nach der Therapie bei allen Patienten. Bei Patienten mit Tendinitis calcarea wurde auch eine Verbesserung der Funktion sowie Veränderungen der Kalzifizierungen untersucht. Bei allen Patienten konnte eine statistisch signifikante Verbesserung der Schmerzen sowie des Bewegungsumfanges beobachtet werden (p 0,0001. Röntgenaufnahmen ergaben eine partielle Verkleinerung der Kalkdepots bei ca. 80 % der Patienten. Aufgrund der geringen Zahl der Patienten fand sich für die EHR keine signifikante Verbesserung der Schmerzsymptomatik. Eine einmalige ESWT kann zu einer deutlichen Verbesserung der Schmerzsymptomatik und zu einer Verbesserung des Bewegungsumfanges führen. Bei 80 % der Patienten mit einer Tendinitis calcarea findet sich weiter eine partielle Verkleinerung der Kalkdepots 6 Wochen nach Therapie.

  1. Application of coal petrographic methods in petroleum and natural gas exploration. Anwendung kohlenpetrographischer Methoden bei der Erdoel- und Erdgasprospektion

    Energy Technology Data Exchange (ETDEWEB)

    Teichmueller, M.

    1971-02-15

    The relationship that exists between coalification and the formation of liquid petroleum and natural gas depends entirely upon the temperature in the earth's crust and the duration of heating. The degree of coalification can be determined by reflectivity measurements on very small vitrinitic (huminitic) inclusions in sedimentary rocks, because a satisfactory correlation has been established between mean reflectivity (R/sub m Oil/) and different parameters of chemical rank using 900 vitrites of different rank. This paper reports the considerable experience obtained with this method using cores and cuttings from boreholes of the German oil industry. Subsequently, examples from other countries are described which confirm the applicability of the method. Results obtained so far suggest that oil deposits may occur when the reflectivity (R/sub m Oil/) of the vitrinite lies between 0.3 and 1.0% (brown coal to high-volatile bituminous stage), whereas economic gas deposits may be found when R/sub m Oil/ extends from 0.7 to 2.0% (high-low volatile bituminous stage).

  2. Status reports on the development and application of acoustic emission analysis. Proceedings; Statusberichte zur Entwicklung und Anwendung der Schallemissionsanalyse. Beitraege

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2017-08-01

    The colloquium lectures represent the wide range of applications in acoustic emission analysis and testing in the areas of damage development and damage mechanisms, testing of components, condition monitoring, development of new measuring systems and sensors as well as software development regarding locating methods and signal analysis. One focus of the colloquium is on current hardware and software developments for status monitoring by means of AE monitoring. One of the papers was separately analyzed for this database. [German] Die Vortraege des Kolloquiums repraesentieren das breite Spektrum der Anwendungen der Schallemissionsanalyse und -pruefung in den Bereichen der Schadensentwicklung und Schadensmechanismen, Pruefung von Bauteilen, Zustandsueberwachung, Entwicklung neuer Messsysteme und Sensoren sowie Softwareentwicklung bezueglich Ortungsverfahren und Signalanalyse. Ein Schwerpunkt des Kolloquiums betrifft aktuelle Hard- und Softwareentwicklungen zur Zustandsueberwachung durch AE-Monitoring.

  3. Protection of workers during medical application of transcranial magnetic stimulation; Schutz der Beschaeftigten bei der medizinischen Anwendung transkranieller Magnetstimulation

    Energy Technology Data Exchange (ETDEWEB)

    Mischke, Marian [LAVG Brandenburg, Potsdam (Germany)

    2017-07-01

    Transcranial magnetic stimulation (TMS) is used in various applications in medicine. TMS is accompanied by relevant exposures by (extremely) low frequency magnetic fields. The applications can pose a threat to workers' health and safety at work through direct and indirect effects. Since the end of last year, the EMFV has been published to specify the obligations of the employer in association to ''Arbeitsschutzgesetz'' with regards to electromagnetic fields. Based on conventional types of equipment for the TMS, a possible procedure is presented for the employer to fulfill his duties.

  4. Advanced energy conversion and application - Decentralized energy systems. Papers; Fortschrittliche Energiewandlung und -anwendung - Schwerpunkt: Dezentrale Energiesysteme. Vortraege

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2001-07-01

    Decentralized energy systems is the major topic of this VDI report which contains the proceedings of the VDI conference on advanced energy conversion and application. The decentralized energy systems are in the focus because it is expected that they will gain in significance in the course of restructuring and liberalisation of the energy markets and growing commitment to greenhouse gas mitigation. The subjects of the papers are the cogeneration technology in general, and specific systems for combined generation of heat, power and cold,(CHPC systems), systems for renewable energy generation, industrial energy technology, and analysis and optimization of energy systems. The report is intended to serve as a source of guidance and reference for manufacturers and operators of decentralized energy systems, for decision-making on energy policy, and for the energy industry, counselling firms and regulatory/surveillance bodies, and members of universities involved in relevant research and development work. (orig./CB) [German] Themenschwerpunkt des VDI-Berichts sind die dezentralen Energiesysteme, die im Spannungsfeld von fortschreitender Liberalisierung der Energiemaerkte und der Bemuehungen um die Reduzierung von Emissionen an Bedeutung gewinnen. Dabei widmen sich die Beitraege den Systemen zur Kraft-Waerme-Kaelte-Kopplung und zur Nutzung erneuerbarer Energie sowie der industriellen Energietechnik und der Analyse und Optimierung von Energiesystemen. Der Bericht wendet sich an Hersteller und Betreiber dezentraler Energieanlagen, an Entscheidungstraeger aus Politik und Wirtschaft, an Berater und Ueberwachungsinstitutionen sowie an auf diesem Gebiet taetige Hochschullehrer und -mitarbeiter. (orig.)

  5. Development and application of a new tool in driver task analysis; Entwicklung und Anwendung einer neuen Methodik zur Fahreraufgabenanalyse

    Energy Technology Data Exchange (ETDEWEB)

    Fastenmeier, W.; Gstalter, H. [mensch-verkehr-umwelt Institut fuer Angewandte Psychologie, Muenchen (Germany)

    2003-07-01

    A framework for driver task analysis is derived from a model of the drivers information processing. The first step of the procedure (SAFE) is to divide a given driving task (e.g. left turning in a signalised intersection of a certain type) into subtasks. These subtasks are appointed to defined stretches of the road and the time structure of the subtasks is determined. For each subtask an analysis format is used, that organizes different requirements into perception, expectation, judgement, memory, decision and driver action. In a next step, typical driver errors are appointed to the subtasks. Afterwards the information gathered in the analysis procedure is compressed to ratings of the complexity and risk included in each subtask. After the crucial subtasks of a driving task have been determined, a list of those requirements that led to that rating can be compiled. These lists give the potential for aiding the driver e.g. by use of driver assistance systems. (orig.) [German] In den Verkehrswissenschaften existieren bislang keine verkehrsspezifischen Standardverfahren, die eine Anforderungsanalyse auf der Ebene der Fahraufgaben erlauben. Dieser Beitrag stellt die Grundzuege eines Verfahrens zur Fahraufgabenanalyse dar (SAFE: Situative Anforderungsanalyse von Fahraufgaben). Es basiert auf einer Modellvorstellung zu den Informationsverarbeitungsprozessen, die waehrend der Bewaeltigung der Fahraufgabe eine Rolle spielen. Der erste Schritt der Aufgabenanalyse besteht darin, eine ausgewaehlte Fahraufgabe (z.B. Linksabbiegen in einer ampelgeregelten Kreuzung bestimmten Typs) in Teilaufgaben zu zerlegen und eine zeitliche Strukturierung dieser Teilaufgaben vorzunehmen. Diese werden raeumlichen Segmenten zugeordnet, die nacheinander durchfahren werden muessen. Fuer jede Teilaufgabe erfolgt dann die eigentliche Anforderungsanalyse, die nach den Kapiteln Wahrnehmung, Erwartungsbildung, Beurteilung, Gedaechtnisprozesse, Entscheidung/Planung sowie Fahrzeugbedienung mit jeweils bis zu acht Unterkapiteln gegliedert ist. In weiteren Schritten werden die fuer jede Teilaufgabe typischen Fehler aufgelistet, Komplexitaets- und Risikoeinschaetzungen vorgenommen und daraus Listen von Anforderungen erstellt, die das Entlastungspotential bilden, das z.B. durch Fahrerassistenzsysteme ausgeschoepft werden koennte. (orig.)

  6. Siebenjährige Follow-up-Studie zur Anwendung des spannungsfreien Vaginalbandes (TVT zur Behandlung der Stressharninkontinenz

    Directory of Open Access Journals (Sweden)

    Nilsson CG

    2005-01-01

    Full Text Available Studienzweck: Evaluierung der langfristigen Heilungs- und Spätkomplikationsraten bei Stressharninkontinenz der Frau bei Behandlung mit dem spannungsfreien Vaginalband (TVT, das anhand einer minimal-invasiven Operation eingesetzt wird. Methodik: In drei Studienzentren durchgeführte prospektive Beobachtungs- und Kohortenstudie mit ursprünglich 90 Frauen, deren primäre Stressharninkontinenz einen operativen Eingriff erforderlich machte. Zu den Bewertungsvariablen gehörten ein Vorlagentest (Pad-Test zur Messung des Uringewichts je 24 Stunden, ein Stresstest, eine visuelle Analogskala (VAS zur Beurteilung des Beschwerdegrads sowie ein Fragebogen zur Beurteilung der subjektiven Wahrnehmung des Kontinenzstatus durch die Frauen. Ergebnisse: Als Follow-up-Zeitraum wurde ein durchschnittlicher Zeitraum von 91 Monaten (78–100 Monate festgelegt. Sowohl die objektive als auch die subjektive Heilungsrate lag bei den an der Follow-up-Studie teilnehmenden 80 Frauen bei 81,3 %. Bei 7,8 % der Frauen wurde ein asymptomatischer Prolaps der Organe des kleinen Beckens, bei 6,3 % De-novo-Drangsymptome und bei 7,5 % eine rezidivierende Harnwegsinfektion festgestellt. Weitere unerwünschte Nebenwirkungen des Verfahrens wurden nicht festgestellt. Schlussfolgerung: Die Wirkung der TVT-Operation zur Behandlung der Stressharninkontinenz der Frau bleibt über einen Zeitraum von 7 Jahren erhalten.

  7. Environmental penal law. Legal foundations, aspects of administrative law, practical applications. Umweltstrafrecht. Gesetzliche Grundlagen, verwaltungsrechtliche Zusammenhaenge und praktische Anwendung

    Energy Technology Data Exchange (ETDEWEB)

    Meinberg, V. (Max-Planck-Institut fuer Auslaendisches und Internationales Strafrecht, Freiburg im Breisgau (Germany, F.R.)); Moehrenschlager, M. (Bundesministerium der Justiz, Bonn (Germany, F.R.)); Link, W. (eds.)

    1989-01-01

    The book intends to present the complexity of the penal code pertaining to environmental protection including the law on environmental offences in a way which makes the subject understandable for the reader. It is therefore not limited to the criminal law proper but looks at the administrative background and aspect of legal proceedings under these laws. Each area is dealt with by specialists from science and practice. The book is adressed to the experts in judiciary administration, industry, science and the interested layman. (orig.).

  8. Findings relating to the use of ACPI in Windows servers; Erfahrungen in der Anwendung von ACPI bei Windows-Servern

    Energy Technology Data Exchange (ETDEWEB)

    Huser, A.; Grieder, T.

    2004-07-01

    In a practical test, the possibilities and limits of the use of energy-saving sleep modes were compiled for servers of the lower price segment. Many of these servers are used by small to medium-sized enterprises and are left running around the clock, although they are not used at night or during the week-end. The implementation of the sleep modes is based on the so-called ACPI specification (Advanced Configuration and Power Interface), which was created by an industrial consortium. The most advanced of these is the implementation for the Windows Server 2003 operating system. With Linux, the sleep modes are not yet fully available. The test was therefore carried out with the Windows Server 2003 operating system. In many applications, and in particular when the servers are used as file or web servers, no operational disadvantages result from the use of the rest states. By making use of the lowest possible sleep mode during the night and at week-ends, the energy consumption of the server can be halved. For users, the results have been summarised in a two-page fact sheet, which is enclosed with this report as an appendix. (author)

  9. Contract manual for the gas industry. Practically oriented drafting and legally compliant application; Vertragshandbuch Gaswirtschaft. Praxisgerechte Gestaltung und rechtssichere Anwendung

    Energy Technology Data Exchange (ETDEWEB)

    Baumgert, Caspar (ed.) [WEMAG AG, Schwerin (Germany)

    2010-07-01

    The handbook presents all contracts on the delivery and grid side, including their specific clauses and variants along the value chain. This includes base load and auxiliary supply, contracts for private, commercial and industrial special customers as well as re-distributors, metering contracts, grid contracts, storage contracts, and biogas and heat supply contracting. The legal problems are outlined clearly and easy to understand, and the following questions are answered: What are the boundary conditions set by the new energy industry law and general civil law? Inhowfar are the contents of contracts influenced by legal specifications? What options are available for contract drafting, and what are their consequences? What contents are of particular importance? What are the requirements that result from price regulation by civil and cartel law? What is the role of licence fees in product design? What are the chances and risks of innovative products? What options for reaction do providers have in case of (impending) customer insolvency? (orig./RHM)

  10. Contract handbook power industry. Practical design and lgally waterproof application; Vertragshandbuch Stromwirtschaft. Praxisgerechte Gestaltung und rechtssichere Anwendung

    Energy Technology Data Exchange (ETDEWEB)

    Schoene, T. (ed.) [RWE Westfalen-Weser-Ems AG, Dortmund (Germany)

    2008-07-01

    The power economy exhibits numerous contractual characteristics. An indispensable condition for successful negotiating and use of the contracts in practice is the knowledge of the different organization possibilities as well as their handling. The author of the book under consideration reports on the contract design in the current economy. Questions of marketing and the product development are considered thereby. Contracts for services are described by the example of portfolio management. Under understandable preparation of the legal problem areas the author reports on the following questions: (a) What are the fundamental basic conditions of the new power industry law and the general civil law?; (b) Which content of the contracts are strongly affected by legal points?; (c) What are the possibilities of design, and what are there impacts?; (d) Which content of the contracts are of special interest?; (e) How must I proceed in order to gain optimal conditions?; (f) What are the chances and risks of innovative products?; (g) Which possibilities of reaction has a provider in the case of a (threatening) insolvency of a customer?.

  11. Effects of platinum in biological systems - toxicology and pharmaceutical applications; Wirkungen von Platin in biologischen Systemen - Toxikologie und pharmazeutische Anwendung

    Energy Technology Data Exchange (ETDEWEB)

    Nachtigall, D. [Fraunhofer-Institut fuer Toxikologie und Aerosolforschung, Hannover (Germany)

    1997-12-31

    The title of this lecture has intentionally been worded rather vaguely with ``biological systems`` to do justice to the fact that there are meanwhile extensive data available on diverse levels of the toxicology and structure-effect relationships of some platinum compounds. These range from epidemiological descriptions over toxicity studies to molecular biological reaction mechanisms. Any discussion on the toxicity of a substance implies that the substance poses a direct or indirect hazard to humans. In the case of platinum and its compounds there are three main categories of exposure: platinum production including workplaces in the platinum processing industries; clinical treatment with antineoplastic platinum-containing agents; and, finally, the environment, where platinum levels are known to be rising since some years. The association between these exposures becomes clear when one considers the platinum pollution caused by automobile catalytic converters, hospital effluents, and by platinum-containing industrial products in the widest sense. [Deutsch] Der Titel des Vortrages ist mit `biologischen Systemen` sehr allgemein gehalten, da ueber die Toxikologie und die Struktur-Wirkungsbeziehungen einiger Platinverbindungen auf den verschiedensten Ebenen umfangreiche Daten vorliegen. Diese reichen von epidemiologischen Beschreibungen ueber Toxizitaetsstudien bis hin zu molekularbiologischen Reaktionsmechanismen. Die Diskussion um die Toxizitaet von Substanzen impliziert immer die direkte oder indirekte Gefaehrdung des Menschen. Im Falle des Platins und seiner Verbindungen existieren drei wesentliche Expositionsbereiche: Die Platingewinnung sowie die Arbeitsplaetze in der Platin verarbeitenden Industrie, die klinische Behandlung mit antineoplastischen Platinwirkstoffen und schliesslich die Umwelt, in der seit einigen Jahren ansteigende Platinkonzentrationen verzeichnet werden. Die Verbindung zwischen diesen Bereichen wird deutlich, wenn man die Platinimmissionen durch Automobilkatalysatoren, durch Krankenhausabwasser und im weitesten Sinne durch platinhaltige Industrieprodukte beachtet. (orig.)

  12. Training of reverse propagation neural networks applied to neutron dosimetry; Entrenamiento de redes neuronales de propagacion inversa aplicadas a la dosimetria de neutrones

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez P, C. F.; Martinez B, M. R.; Leon P, A. A.; Espinoza G, J. G.; Castaneda M, V. H.; Solis S, L. O.; Castaneda M, R.; Ortiz R, M.; Vega C, H. R. [Universidad Autonoma de Zacatecas, Av. Ramon Lopez Velarde 801, Col. Centro, 98000 Zacatecas, Zac. (Mexico); Mendez V, R. [Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas, Laboratorio de Patrones Neutronicos, Av. Complutense 22, 28040 Madrid (Spain); Gallego, E. [Universidad Politecnica de Madrid, Departamento de Ingenieria Nuclear, ETSI Industriales, Jose Gutierrez Abascal 2, 28006 Madrid (Spain); De Sousa L, M. A. [Centro de Desenvolvimento da Tecnologia Nuclear / CNEN, Av. Pte. Antonio Carlos 6627, 31270-901 Pampulha, Belo Horizonte, Minas Gerais (Brazil)

    2016-10-15

    Neutron dosimetry is of great importance in radiation protection as aims to provide dosimetric quantities to assess the magnitude of detrimental health effects due to exposure of neutron radiation. To quantify detriment to health is necessary to evaluate the dose received by the occupationally exposed personnel using different detection systems called dosimeters, which have very dependent responses to the energy distribution of neutrons. The neutron detection is a much more complex problem than the detection of charged particles, since it does not carry an electric charge, does not cause direct ionization and has a greater penetration power giving the possibility of interacting with matter in a different way. Because of this, various neutron detection systems have been developed, among which the Bonner spheres spectrometric system stands out due to the advantages that possesses, such as a wide range of energy, high sensitivity and easy operation. However, once obtained the counting rates, the problem lies in the neutron spectrum deconvolution, necessary for the calculation of the doses, using different mathematical methods such as Monte Carlo, maximum entropy, iterative methods among others, which present various difficulties that have motivated the development of new technologies. Nowadays, methods based on artificial intelligence technologies are being used to perform neutron dosimetry, mainly using the theory of artificial neural networks. In these new methods the need for spectrum reconstruction can be eliminated for the calculation of the doses. In this work an artificial neural network or reverse propagation was trained for the calculation of 15 equivalent doses from the counting rates of the Bonner spheres spectrometric system using a set of 7 spheres, one of 2 spheres and two of a single sphere of different sizes, testing different error values until finding the most appropriate. The optimum network topology was obtained through the robust design methodology of artificial neural networks where the parameters of the network that produced the best results were selected. (Author)

  13. Application of Artificial Neural Networks to the Analysis of NORM Samples; Aplicación de las Redes Neuronales al Análisis de Muestras NORM

    Energy Technology Data Exchange (ETDEWEB)

    Moser, H.; Peyrés, V.; Mejuto, M.; García-Toraño, E.

    2015-07-01

    This work describes the application of artificial neural networks (ANNs) to analyze the raw data of gamma-ray spectra of NORM samples and decide if the activity content of a certain nuclide is above or below the exemption limit of 1 Bq/g. The main advantage of using an ANN for this purpose is that for the user no specialized knowledge in the field of gamma-ray spectrometry is necessary. In total a number of 635 spectra consisting of varying activity concentrations, seven different materials and three densities each have been generated by Monte Carlo simulation to provide training material to the ANN. These spectra have been created using the simulation code PENELOPE. Validation was carried out with a number of NORM samples previously characterized by conventional gamma-ray spectrometry with peak fitting.

  14. Estudio y simulación de las deformaciones corticales asociadas a la variación del campo gravitacional, usando redes neuronales artificiales

    Directory of Open Access Journals (Sweden)

    Figueredo Báez Yaqueline

    2003-08-01

    Full Text Available

    This work is development with two strategies of processing: the neural computation and the conventional computation. In the conventional computation the mathematical base for the simulation is the theory mechanic of the continuum medium, by means of which an evolutionary algorithm is obtained in function of the evolutionary time estimated; that allows the simulation of models that showing the deformations of the crust in terms of geometric variations. These deformations can be used for the calculation of the gravity anomaly and magnetic anomaly through the method of Talwani. The neural computation assimilates the biological neurons as process elements that are assumed as the gravity information and the magnetic information in the inverse problem, being processed in a Neural Network Artificial with architecture Hopfield and in a Neural Network Artificial with structure cluster.

    Para este trabajo se utilizaron dos estrategias de procesamiento: la computación neuronal y la computaci6n convencional. En la computación convencional, la base matemática para la simulación es la teoría mecánica del medio continuo, mediante la cual se obtiene un algoritmo evolutivo en función de la estimación de un tiempo evolutivo, que permite la simulación de modelos que muestran las deformaciones de la corteza en términos de variaciones geométricas, de tal manera que estas deformaciones se pueden utilizar para el cálculo de las anomalías gravitacional y magnética a través del método de Talwani. La computación neuronal asimila las neuronas biológicas como elementos de proceso, que en el problema de inversión se asumen como información gravimétrica e información magnética, siendo procesadas en una red neuronal artificial con arquitectura Hopfield y en una red neuronal artificial con estructura cluster.

  15. Neutron spectrometry and dosimetry by means of evolutive neural networks; Espectrometria y dosimetria de neutrones por medio de redes neuronales evolutivas

    Energy Technology Data Exchange (ETDEWEB)

    Ortiz R, J.M.; Martinez B, M.R.; Vega C, H.R. [UAZ, Av. Ramon Lopez Velarde Num. 801, 98000 Zacatecas (Mexico)

    2008-07-01

    The artificial neural networks and the genetic algorithms are two relatively new areas of research, which have been subject to a growing interest during the last years. Both models are inspired by the nature, however, the neural networks are interested in the learning of a single individual, which is defined as fenotypic learning, while the evolutionary algorithms are interested in the adaptation of a population to a changing environment, that which is defined as genotypic learning. Recently, the use of the technology of neural networks has been applied with success in the area of the nuclear sciences, mainly in the areas of neutron spectrometry and dosimetry. The structure (network topology), as well as the learning parameters of a neural network, are factors that contribute in a significant way with the acting of the same one, however, it has been observed that the investigators in this area, carry out the selection of the network parameters through the essay and error technique, that which produces neural networks of poor performance and low generalization capacity. From the revised sources, it has been observed that the use of the evolutionary algorithms, seen as search techniques, it has allowed him to be possible to evolve and to optimize different properties of the neural networks, just as the initialization of the synaptic weights, the network architecture or the training algorithms without the human intervention. The objective of the present work is focused in analyzing the intersection of the neural networks and the evolutionary algorithms, analyzing like it is that the same ones can be used to help in the design processes and training of a neural network, this is, in the good selection of the structural parameters and of network learning, improving its generalization capacity, in such way that the same one is able to reconstruct in an efficient way neutron spectra and to calculate equivalent doses starting from the counting rates of a Bonner sphere spectrometric system. (Author)

  16. CALIBRACIÓN DE LOS PARÁMETROS DE UN MODELO DE HORNO DE ARCO ELÉCTRICO EMPLEANDO SIMULACIÓN Y REDES NEURONALES

    Directory of Open Access Journals (Sweden)

    Mauricio Alexánder Álvarez López

    Full Text Available El horno de arco eléctrico proporciona un medio relativamente simple para la fusión de metales. Se utiliza en la producción de acero de alta pureza, aluminio, cobre, plomo, entre otros metales. Sin embargo, los hornos de arco son considerados como la carga más nociva para el sistema eléctrico de potencia. Por consiguiente, resulta de gran importancia contar con modelos de horno de arco que permitan determinar con alto grado de aproximación el comportamiento de este tipo de carga, puesto que se podría evaluar su impacto en términos de índices de calidad de energía para el sistema de potencia al cual se conecten. Uno de los principales problemas que surge al utilizar los modelos matemáticos de arco eléctrico consiste en la calibración de los parámetros que describen la dinámica del modelo. En este documento se muestra un procedimiento para calibrar todos los parámetros de un modelo de horno de arco eléctrico de corriente alterna, dadas mediciones reales de tensiones y corrientes. Se utiliza una red neuronal multicapa como emulador del modelo del horno. La red neuronal se entrena empleando datos de simulación obtenidos del modelo del horno implementado en el entorno Matlab®-Simulink®. Una vez entrenada la red, los parámetros de interés se obtienen resolviendo un problema inverso. Los resultados obtenidos muestran un error máximo de 4,1 % en el valor eficaz de las corrientes del arco eléctrico.

  17. Hot metal temperature prediction by neural networks in the blast furnace; Prediccion mediante redes neuronales de la temperatura de arrabio de un horno alto. Temperatura subyacente de arrabio

    Energy Technology Data Exchange (ETDEWEB)

    Cantera, C.; Jimenez, J.; Varela, I.; Formoso, A.

    2002-07-01

    Based on a simplified model, the underlying temperature criteria is proposed as a method to study the temperature trends in a blast furnace. As an application, a neural network able to forecast hot metal temperatures from 2 to 16 h in advance (with decreasing precision) has been built. This neural network has been designed to work at real time in a production plant. (Author)

  18. Pronóstico de la demanda de energía eléctrica horaria en Colombia mediante redes neuronales artificiales

    Directory of Open Access Journals (Sweden)

    Santiago Medina Hurtado

    2011-01-01

    Full Text Available El pronóstico de la demanda de energía eléctrica de un país o un sector determinado es una tarea de suma importancia no solo desde el punto de vista operativo, sino también del comercial. En este artículo se propone un modelo de pronóstico para la demanda de energía eléctrica en Colombia a nivel horario de una semana completa, mediante una Red Neuronal Artificial. El modelo utiliza información histórica en forma de datos rezagados de la serie de tiempo de demanda, así como información de eventos calendario previamente identificados que producen cambios significativos en los patrones de la demanda de energía a lo largo del año, por otra parte, el modelo propuesto considera un rezago en la información disponible para realizar los pronósticos de alrededor de tres semanas. Tal modelo fue validado a partir de datos reales de consumo de carga para una región específica de Colombia. Los resultados obtenidos fueron contrastados con un modelo auto regresivo (AR y un modelo auto regresivo con variables exógenas (ARX. Tales resultados fueron satisfactorios en términos de la disminución general del error de ajuste, así como del comportamiento durante períodos de tiempo atípicos los cuales son difíciles de pronosticar con modelos tradicionales.

  19. Neural networks for the analysis of margins of safety through code BE+U; Redes neuronales para el analisis de margenes de seguridad mediante codigos be+u

    Energy Technology Data Exchange (ETDEWEB)

    Villamizar, M.; Martorell, S.; Villanueva, J. F.; Carlos, S.; Sanchez, A.; Serradell, V.; Mendizabal, R.; Pelayo, F.; Sol, I.

    2011-07-01

    This paper presents the use of tools {sup S}oft Computing{sup ,} in particular the use of artificial neural networks and the method of decomposition of variance as sensitivity analysis, which allows understanding and modeling the relations between variables uncertain input inputs (defined by functions of distribution of Thermo-hydraulic model parameters) and output outputs variable presentation takes place on LOCA accident in a PWR as application.

  20. MODELADO DE PARTÍCULAS PM10 Y PM2.5 MEDIANTE REDES NEURONALES ARTIFICIALES SOBRE CLIMA TROPICAL DE SAN FRANCISCO DE CAMPECHE, MÉXICO

    Directory of Open Access Journals (Sweden)

    Alberto Antonio Espinosa Guzmán

    Full Text Available In this paper, a computational methodology based on Artificial Neural Networks (ANN was developed to estimate the index of PM10 and PM2.5 concentration in air of San Francisco de Campeche city. A three layer ANN architecture was trained using an experimental database composed by days of the week, time of day, ambient temperature, atmospheric pressure, wind speed, wind direction, relative humidity, and solar radiation. The best ANN architecture, composed by 30 neurons in hidden layer, was obtained using the Levenberg-Marquardt (LM optimization algorithm, logarithmic sigmoid and linear transfer functions. Model results generate predictions with a determination coefficient of 93.01% and 90.10% for PM2.5 and PM10, respectively. The proposed methodology can be implemented in several studies as public health, environmental studies, urban development, and degradation of historical monuments.

  1. Optimization of operation schemes in boiling water reactors using neural networks; Optimizacion de esquemas de operacion en reactores de agua en ebullicion usando redes neuronales

    Energy Technology Data Exchange (ETDEWEB)

    Ortiz S, J. J.; Castillo M, A. [ININ, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico); Pelta, D. A., E-mail: juanjose.ortiz@inin.gob.mx [Universidad de Granada, Escuela Superior de Ingenierias, Informatica y Telecomunicacion, C/Daniel Saucedo Aranda s/n, 18071 Granada (Spain)

    2012-10-15

    In previous works were presented the results of a recurrent neural network to find the best combination of several groups of fuel cells, fuel load and control bars patterns. These solution groups to each problem of Fuel Management were previously optimized by diverse optimization techniques. The neural network chooses the partial solutions so the combination of them, correspond to a good configuration of the reactor according to a function objective. The values of the involved variables in this objective function are obtained through the simulation of the combination of partial solutions by means of Simulate-3. In the present work, a multilayer neural network that learned how to predict some results of Simulate-3 was used so was possible to substitute it in the objective function for the neural network and to accelerate the response time of the whole system of this way. The preliminary results shown in this work are encouraging to continue carrying out efforts in this sense and to improve the response quality of the system. (Author)

  2. Clasificación de fallas con redes neuronales para grupos electrógenos : Faults classification with neuronal networks for electrogen groups

    Directory of Open Access Journals (Sweden)

    Luis Corrales Barrios

    2013-06-01

    Full Text Available Con el incremento del grado de dependencia de la sociedad moderna de los sistemas y procesos tecnológicos complejos, su disponibilidad y correcto funcionamiento se han convertido en una cuestión estratégica, donde las tareas de diagnóstico y clasificación de fallos juegan un rol muy importante con el fin de garantizar y mantener en operación continúa y confiable al proceso, los fallos pueden provocar desde una reducción del desempeño hasta un daño que provoque paradas en la producción. La generación distribuida de energía eléctrica a través de los grupos electrógenos instalados, no está ajena a sufrir fallas. Este trabajo tiene como objetivo el desarrollar un sistema para el diagnóstico y clasificación de fallos para la unidad de motores Diesel (MTU del Emplazamiento de Grupo Electrógeno Camagüey 1. La solución propuesta constituye una herramienta para evaluar la aplicación de mantenimiento preventivo antes de la ocurrencia de un fallo.With the increment of the grade of dependence of the modern society of the systems and complex technological processes, their readiness and correct operation they have become a strategic question, where the tasks of diagnostic and classification of shortcomings plays a very important list with the purpose of to guarantee and to maintain in operation it continues and reliable to the process. The shortcomings can cause from a reduction of the acting until a damage that causes stopped in the production. The distributed generation of electric power through the groups installed, is not unaware to suffer shortcomings. This work has as objective the development of a system for the diagnosis and classification of shortcomings for the Diesel unit of motors (MTU of the Location of Grupo Electrógeno Camagüey 1. The proposed solution constitutes a tool to evaluate the application of preventive maintenance before the occurrence of a failure.

  3. Aplicación de modelos de redes neuronales al modelado y predicción de emisiones de autobuses urbanos

    OpenAIRE

    Nova García, Adrián

    2018-01-01

    Introducción Este Trabajo de Fin de Grado está integrado dentro del programa cuyas siglas son CICLOPE. Este proyecto se desarrolla conjuntamente por profesores de la Escuela Técnica Superior de Ingenieros Industriales y la Escuela Técnica superior de Ingenieros de Minas y Energía y por investigadores del Instituto de Investigación del Automóvil (INSIA). El estudio comienza en 2016 y tiene una duración de 3 años. El principal objetivo es poder reducir las emisiones de los autobuses mediante la...

  4. Le rôle majeur du canal potassique TREK-1 dans la protection neuronale induite par les oméga-3

    Directory of Open Access Journals (Sweden)

    Heurteaux Catherine

    2005-01-01

    Full Text Available The nutritional interest of polyunsaturated fatty acids from omega-3, that are mainly present in vegetal and fish oils is now validated by the scientific community. Their beneficial effects have first been reported in coronary heart diseases. Many neurological and chronic diseases are often related to deficiencies in omega-3 and omega-6 and their derivatives. Polyunsaturated fatty acids from omega-3 family are essential to brain growth and neuronal preserving (foetuses, children, old people as well as visual and cognitive functions. They are recently considered as factors of improvement in some mental diseases. Today, polyunsaturated fatty acids could play a key role in the prevention and/or or the treatment of cerebral diseases. With the development of in vitro and in vivo experimental models, it is now possible to demonstrate the omega-3-induced neuronal protection against major pathologies such as epileptic seizures and cerebral ischemia. The molecular mechanism of neuronal protection induced by omega-3 is now clarified. The omega-3 target would be a potassium channel, TREK-1, which belongs to the new family of 2-P domain potassium channels (K-2P. The discovery of the physiopathological role of these K-2P channels can represent an important therapeutical challenge not only in cerebrovascular diseases, but also in psychiatry.

  5. Determination of the load state of lead-acid batteries using neural networks; Determinacion del estado de carga de baterias plomo-acido utilizando redes neuronales

    Energy Technology Data Exchange (ETDEWEB)

    Cristin V, Miguel A; Ortega S, Cesar A [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2005-07-01

    The charge of lead-acid batteries (LAB), as in any other type of batteries, consists of replacing the energy consumed during the discharge. Nevertheless, as no physical or chemical process is good enough to totality recharge a battery, it is necessary to supply to it more than the 100% of the energy demanded during its discharge. A critical factor to make a suitable load control of the batteries is to determine its own state of load. That is to say, to have an efficient load control, it is necessary to count on means that allow to accurately determining the residual capacity of the battery to deliver load. This one is the one of the aspects of greater interest in the research centers around world. For this reason, in this work it was pretended to develop a calculation algorithm of the state of load of batteries based on a fuzzy-neural network that could calculate the state of load without using the battery current as an input. This is because one of the main problems for the designers of battery load controllers is the correct supervision of the current that circulates around the system in all the rank of operation of the same one because the sensors do not have a linear behavior. [Spanish] La recarga de baterias plomo-acido (BPA), como cualquier otro tipo de baterias, consiste en reponer la energia consumida durante la descarga. Sin embargo, como ningun proceso fisico o quimico es lo bastante eficiente para recargar a totalidad una bateria, es necesario suministrarle mas del 100% de la energia demandada durante su descarga. Un factor critico para realizar un adecuado control de carga de las baterias, es determinar su propio estado de carga. Es decir, para tener un control de carga eficiente, es necesario contar con un medio que permita determinar con precision la capacidad remanente de la bateria para entregar carga. Este es uno de los aspectos de mayor interes en los centros de investigacion alrededor el mundo. Por tal razon, en este trabajo se propuso desarrollar un algoritmo de calculo del estado de carga de baterias basado en una red neuro-difusa que pudiera calcular el estado de carga sin utilizar la corriente de la bateria como entrada. Ello se debe a que uno de los principales problemas para los disenadores de controladores de carga de bateria es la correcta supervision de la corriente que circula por el sistema en todo el rango de operacion del mismo pues los sensores no tienen un comportamiento lineal.

  6. Clasificación de fallas con redes neuronales para grupos electrógenos; Faults classification with neuronal networks for electrogen groups

    Directory of Open Access Journals (Sweden)

    Luis Corrales Barrios

    2013-06-01

    Full Text Available Con el incremento del grado de dependencia de la sociedad moderna de los sistemas y procesos tecnológicos complejos, su disponibilidad y correcto funcionamiento se han convertido en una cuestión estratégica, donde las tareas de diagnóstico y clasificación de fallos juegan un rol muy importante con el fin de garantizar y mantener en operación continúa y confiable al proceso, los fallos pueden provocar desde una reducción del desempeño hasta un daño que provoque paradas en la producción. La generación distribuida de energía eléctrica a través de los grupos electrógenos instalados, no está ajena a sufrir fallas. Este trabajo tiene como objetivo el desarrollar un sistema para el diagnóstico y clasificación de fallos para la unidad de motores Diesel (MTU del Emplazamiento de Grupo Electrógeno Camagüey 1. La solución propuesta constituye una herramienta para evaluar la aplicación de mantenimiento preventivo antes de la ocurrencia de un fallo.  With the increment of the grade of dependence of the modern society of the systems and complex technological processes, their readiness and correct operation they have become a strategic question, where the tasks of diagnostic and classification of shortcomings plays a very important list with the purpose of to guarantee and to maintain in operation it continues and reliable to the process. The shortcomings can cause from a reduction of the acting until a damage that causes stopped in the production. The distributed generation of electric power through the groups installed, is not unaware to suffer shortcomings. This work has as objective the development of a system for the diagnosis and classification of shortcomings for the Diesel unit of motors (MTU of the Location of Grupo Electrógeno Camagüey 1. The proposed solution constitutes a tool to evaluate the application of preventive maintenance before the occurrence of a failure.

  7. Análisis y pronóstico de la demanda de potencia eléctrica en Bolivia: una aplicación de redes neuronales

    OpenAIRE

    Sanjinés, Gimmy Nardó

    2011-01-01

    El objetivo del presente trabajo de investigación es analizar la demanda de energía eléctrica en Bolivia con base en el pronóstico de series de tiempo. La predicción de datos futuros desde la perspectiva económica es importante porque se utiliza para optimizar la asignación de la energía en el tiempo, bajo la premisa de que cualquier mejora en la disminución del error de pronóstico representa una mejora en el excedente del consumidor. El pronóstico, por su complejidad, es realizado básicament...

  8. Der Einfluss von COMT Val158Met auf neuronale Korrelate von Delay Discounting bei adulten Patienten mit Aufmerksamkeitsdefizit/Hyperaktivitätsstörung (ADHS)

    OpenAIRE

    Gieseke, Heiner Alexander

    2013-01-01

    In dieser Studie führten 37 adulte Patienten mit einer Aufmerksamkeitsdefizit-/Hyperaktivitätsstörung (ADHS) ein Delay Discounting (DD) - Paradigma aus, während gleichzeitig mittels Funktioneller-Nahinfrarotspektroskopie (fNIRS) die Gehirnaktivität der „Regions of Interest“ (ROIs) des Orbitofrontalen-Kortex (OFC) und des Dorsolateralen-Präfrontalen-Kortex (dlPFC) gemessen wurde. Mittels Fragebögen und eines Delay Discounting Tasks (DDT) wurden zusätzlich Verhaltensparameter erhoben und flosse...

  9. Estimación de los márgenes de estabilidad de tensión en un sistema de potencia usando redes neuronales artificiales

    Directory of Open Access Journals (Sweden)

    Gloria Patricia López Sepúlveda

    2013-09-01

    Full Text Available Power systems have become more sensitive to voltage stability problems due to load growth and the increasing utilization of alternative energy. Voltage stability appears not to be properly evaluated by methods of static analysis, such as load flux, because these methods use simple models to describe the system’s components. Moreover, dynamic models for voltage stability analysis require high computational cost. Considering this, there is a need of developing more efficient and accurate methodologies. This article shows a model based on Artificial Neural Networks (ANN. ANN is a technique of artificial intelligence inspired in the biological neural networks of the human brain. An ANN is capable of learning through experience and takes the main characteristics of a dataset. Additionally, such networks may offer correct answers for inputs that present variations due to noise effects or distortions in the environment. ANNs provide a switching behavior as a function of the environment, that is, they get an input dataset and transform it into a consistent output set. This represents the rationale behind using ANNs for the development of this work; in other words, ANNs allow the prediction of a voltage-stability margin in power systems using information about their state variables. The training datasets are obtained from the load flux method, which delivers the initial conditions (i.e. the network input variables. Results are obtained through an estimating NN based methodology and compared to the results obtained when using estimating margin deterministic methods in a 4-node tests system.

  10. Estimación de cargas térmicas de climatización de hoteles mediante simulación y redes neuronales artificiales

    Directory of Open Access Journals (Sweden)

    Sergio Montelier;et al.

    2010-11-01

    Full Text Available In the present work it is made an estimation of the cooling load of a hotel by using thermal simulation, forseveral occupancy levels and weather conditions.With the results of the thermal simulation an Artificial Neural Network is designed and a neural model isdeveloped, which relate the cooling load of the air conditioning system with the daily maximum andminimum outside temperatures for various occupation levels of the hotel, allowing to carry out differentoccupational strategies and predict the energy consumption of the air conditioning system in a quick and precise way.

  11. Detection of breast cancer using advanced techniques of data mining with neural networks; Deteccion de cancer de mama usando tecnicas avanzadas de mineria de datos con redes neuronales

    Energy Technology Data Exchange (ETDEWEB)

    Ortiz M, J. A.; Celaya P, J. M.; Martinez B, M. R.; Solis S, L. O.; Castaneda M, R.; Garza V, I.; Martinez F, M.; Lopez H, Y.; Ortiz R, J. M. [Universidad Autonoma de Zacatecas, Av. Ramon Lopez Velarde 801, Col. Centro, 98000 Zacatecas, Zac. (Mexico)

    2016-10-15

    The breast cancer is one of the biggest health problems worldwide, is the most diagnosed cancer in women and prevention seems impossible since its cause is unknown, due to this; the early detection has a key role in the patient prognosis. In developing countries such as Mexico, where access to specialized health services is minimal, the regular clinical review is infrequent and there are not enough radiologists; the most common form of detection of breast cancer is through self-exploration, but this is only detected in later stages, when is already palpable. For these reasons, the objective of the present work is the creation of a system of computer assisted diagnosis (CAD x) using information analysis techniques such as data mining and advanced techniques of artificial intelligence, seeking to offer a previous medical diagnosis or a second opinion, as if it was a second radiologist in order to reduce the rate of mortality from breast cancer. In this paper, advances in the design of computational algorithms using computer vision techniques for the extraction of features derived from mammograms are presented. Using data mining techniques of data mining is possible to identify patients with a high risk of breast cancer. With the information obtained from the mammography analysis, the objective in the next stage will be to establish a methodology for the generation of imaging bio-markers to establish a breast cancer risk index for Mexican patients. In this first stage we present results of the classification of patients with high and low risk of suffering from breast cancer using neural networks. (Author)

  12. Spectrometry and dosimetry of isotopic sources of neutrons by means of artificial neural networks; Espectrometria y dosimetria de fuentes isotopicas de neutrones mediante redes neuronales artificiales

    Energy Technology Data Exchange (ETDEWEB)

    Vega C, H. R.; Ortiz R, J. M.; Hernandez D, V. M; Martinez B, M. R. [Universidad Autonoma de Zacatecas, Unidad Academica de Estudios Nucleares, Calle Cipres No. 10, Fracc. La Penuela, 98068 Zacatecas (Mexico); Gallego, E.; Lorente, A. [Universidad Politecnica de Madrid, Departamento de Ingenieria Nuclear, C/Jose Gutierrez Abascal No. 2, 28006 Madrid (Spain); Barquero, R., E-mail: fermineutron@yahoo.co [Hospital del Rio Hortega, C/Dulzaina No. 2, 47012 Valladolid (Spain)

    2010-09-15

    The artificial neural networks technology has been applied to reconstruct the neutrons spectra of two isotopic sources: {sup 252}Cf, and {sup 241}Am-Be. Also, this technology has been applied to obtain the effective dose, E, and the personal dose equivalents, Hp(10) and environmental, H *(10). To obtain the spectra and the doses only were used the count rates produced in a Bonner Spheres spectrometer with a scintillator of {sup 6}LiI(Eu) of 0.4 {phi} x 0.4 cm{sup 2}. The equivalent environmental dose and the spectra of the sources were also obtained by means of the reconstruction code BUNKIUT. When comparing the results obtained by means of both procedures it was found that they are consistent. (Author)

  13. Artificial neural networks for prediction of quality in resistance spot welding; Redes neuronales artificiales para la prediccion de la calidad en soldadura por resistencia por puntos

    Energy Technology Data Exchange (ETDEWEB)

    Martin, O.; Lopez, M.; Martin, F.

    2006-07-01

    An artificial neural network is proposed as a tool for predicting from three parameters (weld time, current intensity and electrode sort) if the quality of a resistance spot weld reaches a certain level or not. The quality is determined by cross tension testing. The fact of reaching this quality level or not is the desired output that goes with each input of the artificial neural network during its supervised learning. The available data set is made up of input/desired output pairs and is split randomly into a training subset (to update synaptic weight values) and a validation subset (to avoid overfitting phenomenon by means of cross validation). (Author) 44 refs.

  14. Análisis de rendimiento académico estudiantil usando data warehouse y redes neuronales Analysis of students' academic performance using data warehouse and neural networks

    Directory of Open Access Journals (Sweden)

    Carolina Zambrano Matamala

    2011-12-01

    Full Text Available Cada día las organizaciones tienen más información porque sus sistemas producen una gran cantidad de operaciones diarias que se almacenan en bases de datos transaccionales. Con el fin de analizar esta información histórica, una alternativa interesante es implementar un Data Warehouse. Por otro lado, los Data Warehouse no son capaces de realizar un análisis predictivo por sí mismos, pero las técnicas de inteligencia de máquinas se pueden utilizar para clasificar, agrupar y predecir en base a información histórica con el fin de mejorar la calidad del análisis. En este trabajo se describe una arquitectura de Data Warehouse con el fin de realizar un análisis del desempeño académico de los estudiantes. El Data Warehouse es utilizado como entrada de una arquitectura de red neuronal con tal de analizar la información histórica y de tendencia en el tiempo. Los resultados muestran la viabilidad de utilizar un Data Warehouse para el análisis de rendimiento académico y la posibilidad de predecir el número de asignaturas aprobadas por los estudiantes usando solamente su propia información histórica.Every day organizations have more information because their systems produce a large amount of daily operations which are stored in transactional databases. In order to analyze this historical information, an interesting alternative is to implement a Data Warehouse. In the other hand, Data Warehouses are not able to perform predictive analysis for themselves, but machine learning techniques can be used to classify, grouping and predict historical information in order to improve the quality of analysis. This paper depicts architecture of a Data Warehouse useful to perform an analysis of students' academic performance. The Data Warehouse is used as input of a Neural Network in order to analyze historical information and forecast. The results show the viability of using Data Warehouse for academic performance analysis and the feasibility of predicting the number of approved courses for students using only their own historical information.

  15. MindFluctuations: consideraciones Poéticas, Estéticas y Técnicas de un Espectáculo de Baile Explorando Conexiones Neuronales

    Directory of Open Access Journals (Sweden)

    Tania Fraga

    2018-01-01

    Full Text Available In this era of co-evolution of humans and computers, we are witnessing a lot of fear that humanity will lose control and autonomy. This is a possibility. Another is the development of symbiotic systems among men and machines. To accomplish this goal, it is necessary to research ways to apply some key concepts that have a catalytic effect over such ideas. In the discussion of this hypothesis through the case study of the spectacle MindFluctuations—an experimental artwork exploring neural connections—we are looking for ways to develop them from conception to realization. The discussion also establishes a process of reflection on the design, development and production of this dance spectacle. This artwork uses a customized Java application, NumericVariations, to explore the quoted neural connections for spectacles, performances and site-specific installations. Its approach was made possible by recent neuroscience research and the development of a Brain Computer Interface (BCI integrated with a virtual reality framework, which enable an experimental interactive virtual reality artwork to emerge. A neural helmet connected to the computer and entwined with mathematical procedures enabled a symbiosis of humans with computers.

  16. Herramienta para diseño automático de arquitecturas a medida basadas en redes neuronales para reconocimiento de patrones visuales

    OpenAIRE

    Leiva, Lucas; Acosta, Nelson; Vázquez, Martín

    2006-01-01

    El trabajo propone la construcción de una herramienta con interfaz intuitiva capaz de generar arquitecturas hardware de reconocimiento de patrones a partir de un conjunto de especificaciones de alto nivel ingresadas por el usuario. La salida de la herramienta es código de descripción hardware sintetizable (VHDL) que se utiliza para la configuración de una FPGA. Se propone que la herramienta facilite todas las etapas del desarrollo de sistemas de reconocimiento de patrones visuales.

  17. Searching of fuel recharges by means of genetic algorithms and neural networks in BWRs; Busqueda de recargas de combustible mediante algoritmos geneticos y redes neuronales en BWRs

    Energy Technology Data Exchange (ETDEWEB)

    Ortiz S, J.J.; Montes T, J.L.; Castillo M, J.A.; Perusquia del C, R. [ININ, Carretera Mexico-Toluca Km. 36.5, 52045 Estado de Mexico (Mexico)

    2004-07-01

    In this work improvements to the systems RENOR and RECOPIA are presented, that were developed to optimize fuel recharges in boiling water reactors. The RENOR system is based on a Multi state recurrent neural network while RECOPIA is based on a Genetic Algorithm. In the new versions of these systems there is incorporate the execution of the Turned off Margin in Cold and the Excess of Reactivity in Hot. The new systems were applied to an operation cycle of the Unit 1 of the Nuclear Power station of Laguna Verde. The recharges of fuel obtained by both methods are compared among if being observed that RENOR has better performance that RECOPIA, due to the nature of its search process. RECOPIA requires of approximately 1.4 times more time that RENOR to find a satisfactory recharge of fuel. (Author)

  18. Probabilidad, Redes Neuronales e Inteligencia Artificial en Composición Musical. Desarrollo de los Sistemas MusicProb y MusicNeural

    OpenAIRE

    Padilla Martín-Caro, Víctor

    2016-01-01

    Tesis Doctoral leída en la Universidad Rey Juan Carlos de Madrid en 2012. Directores de la Tesis: Antonio Palmer Aparicio y Agustín Martínez Peláez CC. de la Educación, el Lenguaje, la Cultura y las Artes

  19. Desarrollo de un modelo de redes neuronales artificiales para predecir la resistencia a la compresión y la resistividad eléctrica del concreto

    OpenAIRE

    Lizarazo Marriaga, Juan Manuel; Gómez Cortés, José Gabriel

    2010-01-01

    En esta investigación se busca obtener un método para predecir la resistencia a la compresión mediante el peso unitario y la velocidad de pulso ultrasónico usando 41 mezclas de concreto diferentes. El estudio ha sido por la necesidad de obtener un método rápido para predecir la resistencia a la compresión del concreto. De la misma manera, la investigación también busca predecir la resistividad eléctrica del concreto mediante el peso unitario, la velocidad de pulso ultrasónico y la resisten...

  20. Incentives for development and application of environmentally friendly biotechnological products and processes; Anreize fuer die Entwicklung und Anwendung umweltfreundlicher biotechnischer Produkte und Verfahren

    Energy Technology Data Exchange (ETDEWEB)

    Rhein, Hans-Bernhard; Endler, Katharina [Umweltkanzlei Dr. Rhein, Sarstedt (Germany); Ulber, Roland; Muffler, Kai; Mueller, Felix [Technische Univ. Kaiserslautern (Germany)

    2011-01-15

    Studies assign a tremendous growth potential related to biotechnology. However, the predicted proportion of biotechnological manufactured products in the chemical industry for the year 2010 by 20 % will more likely remain by today's 5 %. The study deals with the question why biotechnological products are currently established at the market in the obvious slow way. Therefore, the current constraints and existing respectively new incentive instruments referring to the white (industrial) biotechnology are analyzed to focus on the promotion of the development and application of environmentally friendly biotechnology products and methods. In addition to a search concerning environmental relevance and further development of white biotechnology, the postulated constraints and incentives as well as new promotions are discussed with the help of expert interviews. On the basis of a preliminary study - after further discussion with experts - concrete proposals on improvements related to an ongoing establishment of biotechnology will be derived. Based on case studies (2nd generation biofuels, polyhydroxybutyrate as biopolymer and phytase as an animal feed additive), the practical effects and specific conditions to incentives, from the perspective of biotechnological processes and environmentally friendly products are investigated. Overall, about 40 activities were recommended, which could be assigned to areas of direct government incentives (tax policy/subsidies, subsidies, education and research policy, basic political conditions, government demand and information policy/consumer intelligence) as well as non-governmental incentives (knowledge transfer and cooperation, organisation-related policy, capital market financing). (orig.)

  1. Arterial spin labelling in imaging of renal diseases and renal allograft pathology; MRT-Perfusionsmessung mit Arterial Spin Labelling. Anwendung fuer die Niere und Transplantatniere

    Energy Technology Data Exchange (ETDEWEB)

    Hueper, Katja; Gutberlet, Marcel [Medizinische Hochschule Hannover (Germany). Inst. fuer Diagnostische und Interventionelle Radiologie; Kuehn, Bernd [Siemens AG/Siemens Healthcare GmbH, Erlangen (Germany)

    2016-06-15

    Arterial Spin Labelling (ASL) is a technique for non-invasive and contrast-free assessment of perfusion with MRI. Renal ASL allows examination of renal pathophysiology, evaluation of the course of renal disease and therapy effects by longitudinal measurements as well as characterization of renal tumors. In this article, techniques of ASL will be explained and challenges of renal ASL will be emphasized. In addition, examples for clinical application of ASL for diagnosis of renal disease and renal allograft pathology will be given.

  2. Rehabilitation of the natural gas field Thoense with wet transport of natural gas; Sanierung des Erdgasfeldes Thoense unter Anwendung des Erdgasnasstransports

    Energy Technology Data Exchange (ETDEWEB)

    Neumann, W.; Gerhartz, B.; Schmitt, D.; Uphoff, T. [BEB Erdgas und Erdoel GmbH, Hannover (Germany)

    1998-12-31

    Natural gas has been extracted the gas field of Thoense situated at the Northern fringe of the city of Hannover for over forty years. At all 10 bore sites the gas was dried with glycol dryers. While dealing with the problem of hydrocarbon emissions from the dryers it became evident, that some of the very old plants had to be rehabilitated. BEB operates the Thoense field on behalf of Elwerath/Brigitta/Deutz. An integrated concept, based on wet transport of natural gas, was used to remove the emission of hydrocarbons and rehabilitate the surface plants in order to cut operating costs. The field at Thoense is now economically efficient enough to continue operations for a long time. [Deutsch] Aus dem am nordoestlichen Stadtrand Hannovers liegenden Gasfeld Thoense wird seit ueber vierzig Jahren Erdgas gefoerdert. Die Gastrocknung erfolgte dort in ueblicher Weise mit Glykoltrocknungsanlagen an allen zehn Bohrungen. Bei der Bearbeitung des damit verbundenen Problems der Kohlenwasserstoffemissionen aus den Trocknungsanlagen wurde der Sanierungsbedarf an den z.T. sehr alten Anlagen deutlich. Das Feld Thoense wird von BEB fuer das Konsortium Elwerath/Brigitta/Deutz betrieben. Es wird gezeigt, wie mit einem integrierten Konzept auf der Basis des Erdgasnasstransportes die KW-Emissionen beseitigt wurden und gleichzeitig eine betriebskostensenkende Sanierung der obertaegigen Anlagen durchgefuehrt werden konnte. Damit wurde die wirtschaftliche Voraussetzung geschaffen, die Gasversorgung aus Thoense noch lange aufrecht erhalten zu koennen. (orig.)

  3. The use of radioactive materials in German schools. Obstacles and chances; Anwendung von radioaktiven Stoffen in Schulen in Deutschland. Hindernisse und Chancen

    Energy Technology Data Exchange (ETDEWEB)

    Vahlbruch, Jan-Willem [Hannover Univ. (Germany). Inst. fuer Radiooekologie und Strahlenschutz

    2015-07-01

    The basics for the understanding of radioactivity and radioprotection are set in the secondary school. Therefore the German-Swiss Radiation Protection Association already is trying to support the appropriate teaching of relevant topics in school for a long time. Unfortunately experiments with radioactive material are hampered in Germany by complex and confusing legislation. In this contribution the framework is described which is given by the German legislation for the use of radioactive sources in secondary schools. Additionally proposals for different simple experiments with radioactivity are presented which can be easily implemented in teaching and alternative methods are introduced like e.g. virtual experiments.

  4. Safety bey statistics? A critical view on statistical methods applied in health physics; Sicherheit durch Statistik? Ein kritischer Blick auf die Anwendung statistischer Methoden im Strahlenschutz

    Energy Technology Data Exchange (ETDEWEB)

    Kraut, W. [Duale Hochschule Baden-Wuerttemberg (DHBW), Karlsruhe (Germany). Studiengang Sicherheitswesen

    2016-07-01

    The only proper way to describe uncertainties in health physics is by statistical means. But statistics never can replace Your personal evaluation of effect, nor can statistics transmute randomness into certainty like an ''uncertainty laundry''. The paper discusses these problems in routine practical work.

  5. Applying ERNEUERBAR KOMM. in the context of rural development in north eastern Bavaria (Mittelfranken); ERNEUERBAR KOMM. Anwendung im Rahmen der Laendlichen Entwicklung Mittelfranken

    Energy Technology Data Exchange (ETDEWEB)

    Brumberg, Friedrich-Wilhelm [Amt fuer Laendliche Entwicklung Mittelfranken, Ansbach (Germany)

    2012-07-01

    Rural areas in Bavaria are faced with the same challenges as everywhere: Demographic chane, structural changes in agriculture and in small industries and trade, global climate change, and the requirements of the intended energy turnaround. This requires regional solutions. The contribution outlines the research project 'Integrative potential analysis for renewable energy sources' (ERNEUERBAR KOMM.) led by Prof. Dr. Klaerle (Ms.). Currently, the Mittelfranken regional development authority is carrying out two potential analyses in 12 communities, and five more regions with a total of 40 communities intend to participate as well.

  6. Application of biotests for the characterization of exposure pathways for endocrine disrupters from plastics; Anwendung von Biotests zur Charakterisierung der Expositionspfade fuer Umwelthormone aus Kunststoffen

    Energy Technology Data Exchange (ETDEWEB)

    Wagner, Martin; Oehlmann, Joerg [Frankfurt Univ., Frankfurt am Main (Germany). Abteilung Aquatische Oekotoxikologie

    2011-12-15

    The present project aims to characterise the exposure pathways for endocrine disruptors from plastic materials. A bioassay-based approach was employed to investigate and characterise the endocrine activity. Migration studies with food packaging and plastic preforms document the leaching of estrogen-like compounds from several types of plastic in the Yeast Estrogen Screen and the E-Screen. Additionally, anti-estrogenic activity was predominant in many samples. The detection of complex migration profiles provides evidence for the leaching of several, diverse-acting endocrine disruptors. Moreover, extracts of plastic food packaging exhibited agonistic activity on the estrogen receptor, retinoid X receptor, and vitamin D receptor. A theoretical exposure assessment for marine molluscs implies that endocrine disruptors from plastic might induce relevant effect in the environment. Within the exemplary investigation of bottled mineral water, 60% of the products were characterised as significantly estrogenic using the YES and E-Screen. These in vitro data point to the plastic packaging being one source of estrogenic contamination. An in vivo study employing the estrogen-sensitive model organism Potamopyrgus antipodarum supports this hypothesis. By using several analytical techniques (GC-MS, LC-MS/MS) we identified several well-known endocrine disruptors in bottled water and the plastic material, e.g. numerous phthalates and phenols. Moreover, potent antagonists of the estrogen and androgen receptor were extracted from bottled water. In a non-target analysis (Orbitrap-MS) a compound with the exact mass of 363.1992 [M+H{sup +}] correlated highly significantly with the biological activity. On the basis of the methods optimised and applied within the project we elaborated a set of aspects that are crucial for the applicability of bioassays to characterise the endocrine activity of complex samples. Employing a bioassay-based approach we provide evidence for the presence and migration of endocrine disruptors from plastic materials. In that sense, polymers represent a relevant but currently neglected source of human and environmental exposure to endocrine active compounds. Concerning the identification and toxicological characterisation of those chemicals, there is substantial need for further research. (orig.)

  7. Si{sub 3}N{sub 4} materials and applications; Si{sub 3}N{sub 4}-Werkstoffe und deren Anwendung

    Energy Technology Data Exchange (ETDEWEB)

    Woetting, G.; Leimer, G.; Gugel, E. [Cremer Forschungsinstitut GmbH und Co. KG, Roedental (Germany)

    2000-07-01

    Silicon nitrides, or silicon nitride-based materials, offer a very wide range of high-duty applications due to their high mechanical strength and good resistance to thermal, corrosive, and/or abrasive wear. Variation and optimization of their properties in response to intended applications is described in detail, also referring to potential new applications. (orig./CB) [German] Siliciumnitrid(Si3N4)- bzw. SN-Werkstoffe finden aufgrund ihrer hohen mechanischen Festigkeit sowie guten thermischen, korrosiven und/oder abrasiven Bestaendigkeit bereits vielfaeltige Anwendungen als hochbelastete Bauteile. Um fuer die jeweiligen Einsatzbedingungen optimale Werkstoffe einzusetzen, sind spezifische Modifizierungen moeglich und sinnvoll. Diesbezueglich kommerziell verfuegbare Si3N4-Werkstoffqualitaeten werden vorgestellt und derzeitige sowie potentielle Anwendungen ausgefuehrt. Die haeufig als Hemmnis fuer einen breiten Einsatz angefuehrten Bauteilkosten werden diskutiert. (orig.)

  8. [Kombinierte Anwendung von Strahlentherapie und adjuvanter Therapie mit einem Mistelextrakt (Viscum album L.) zur Behandlung des oralen malignen Melanoms beim Hund: Eine retrospektive Studie].

    Science.gov (United States)

    von Bodungen, Uta; Ruess, Katja; Reif, Marcus; Biegel, Ulrike

    2017-01-01

    Hintergrund: Orale maligne Melanome (OMM) des Hundes zeichnen sich durch schnelles Wachstum, lokale Invasion und hohe Metastasierungsraten aus. Extrakte auf Basis von Viscum album L. (VAE) werden zunehmend in der Krebstherapie sowohl in der Human- als auch in der Veterinärmedizin eingesetzt. Ziel unserer Studie war es zu untersuchen, inwieweit die adjuvante Therapie mit VAE eine therapeutische Option zur Behandlung von OMM ist. Besonderes Augenmerk galt dabei der Überlebenszeit und möglichen Nebenwirkungen. Tiere und Methoden: 26 Hunde mit OMM, die in einem der größten veterinäronkologischen Zentren der Schweiz allesamt eine Strahlentherapie erhielten (teilweise nach operativer Tumorresektion) wurden in die retrospektive Studie eingeschlossen: 18 Hunde wurden mit VAE behandelt (1 ml VAE (Iscador®) in ansteigenden Konzentrationen von 0,1 bis 20 mg/ml subkutan 3-mal pro Woche (VAE-Gruppe), 8 erhielten keine adjuvante Behandlung (Vergleichsgruppe). Wir verglichen die Größenentwicklung der OMM sowie die Überlebenszeit. Ergebnisse: Patienten mit Bestrahlung und adjuvanter VAE-Therapie zeigten mit 236 Tagen eine signifikant längere mediane Überlebenszeit im Vergleich zu Patienten mit Bestrahlung, aber ohne adjuvante VAE-Therapie (49 Tage; Log-Rank-Test: p = 0,0047). Die VAE-Therapie verlängerte die Überlebenszeit um mehr als zwei Drittel (Hazard Ratio (HR) = 0,30, 95%-Konfidenzintervall (KI) 0,11-0,86; p = 0,024), während ein höheres Tumorstadium gemäß UICC (Union internationale contre le cancer) einen statistischen Trend zur Verdopplung des Sterberisikos zeigte (UICC-Stadium III/IV vs. I/II: HR = 2,12, 95%-KI 0,88-5,12; p = 0,095). Zwei Patienten zeigten milde Nebenwirkungen während der VAE-Behandlung. Einer der beiden zeigte 1 Tag lang ein selbstlimitiertes Fieber, bei dem anderen Patienten reduzierten wir die Dosis von einem konzentrierteren zu einem weniger konzentrierten VAE (Serie 0) aufgrund von Müdigkeit, die daraufhin verschwand. Schlussfolgerungen: VAE ist eine sichere, nebenwirkungsarme Behandlung und scheint sich positiv auf die Überlebenszeit von Hunden mit OMM auszuwirken. Somit ist dieser therapeutische Ansatz es wert, vermehrt bei der adjuvant zur Strahlentherapie eingesetzten Behandlung des OMM in Betracht gezogen zu werden. Die verglichenen Gruppen waren jedoch klein, divers und nicht konsistent hinsichtlich aller prognostischen Parameter. Eine prospektive Studie mit einer größeren Studienpopulation wäre daher von Interesse. © 2017 S. Karger GmbH, Freiburg.

  9. Wissensstrukturierung im Unterricht: Neuere Forschung zur Wissensreprasentation und ihre Anwendung in der Didaktik (Knowledge Structuring in Instruction: Recent Research on Knowledge Representation and Its Application in the Classroom).

    Science.gov (United States)

    Einsiedler, Wolfgang

    1996-01-01

    Asks whether theories of knowledge representation provide a basis for the development of theories of knowledge structuring in instruction. Discusses codes of knowledge, surface versus deep structures, semantic networks, and multiple memory systems. Reviews research on teaching, external representation of cognitive structures, hierarchical…

  10. Evaluation of multiple trauma victims with 16-row multidetector CT (MDCT): a time analysis; Anwendung der 16-Zeilen-Mehrdetektor-CT in der Initialdiagnostik beim Polytrauma: Eine Zeitanalyse

    Energy Technology Data Exchange (ETDEWEB)

    Heyer, C.M.; Nicolas, V. [Bochum Univ. (Germany). Inst. fuer Diagnostische Radiologie, Interventionelle Radiologie und Nuklearmedizin; Rduch, G.J. [Bochum Univ. (Germany). Klinik fuer Chirurgie; Wick, M.; Muhr, G. [Bochum Univ. (Germany). Medizinische Klinik III, Pneumologie, Allergologie und Schlafmedizin; Bauer, T.T. [Berufsgenossenschaftliche Kliniken Bergmannsheil, Ruhr-Univ. Bochum (Germany)

    2005-12-15

    Purpose: Description and time analysis of a 16-row MDCT protocol in the evaluation of multiple trauma patients considering transport, time of scanning, patient positioning, image reconstruction, and image interpretation. Materials and methods: Between May and December 2004, 60 multiple trauma patients underwent 16-row MDCT (Sensation, Siemens, Erlangen, Germany). The protocol included serial scanning of the head, spiral scanning of the cervical spine and contrast-enhanced spiral scanning of the thorax/abdomen with multiplanar reformations (MPR) of the thoracic/lumbar spine and the pelvis. All time intervals including transport, patient positioning, scanning, duration of MPR, total time in the examination room, and time to first and final image interpretation were prospectively evaluated. Furthermore, patient characteristics, trauma profiles, and mortality rates were recorded. Results: 46 male and 14 female patients (mean age 43.6 years) were enrolled in the study. Time analysis of 16-row MDCT revealed the following results (mean time standard deviation): Emergency room treatment and transport 19.2{+-}6.7 min, patient positioning 16.5{+-}6.5 min, scan duration 8.0{+-}3.3 min, total time in examination room 24.5{+-}7.2 min, image reconstruction including MPR 32.0{+-}16.4 min, and time of first (16.4{+-}4.7 min) and final image interpretation (82.5{+-}30.4 min). Trauma profiles revealed thoracic injuries in 35/60 patients (58.3%), head injuries in 23/60 patients (38.3%), abdominal injuries in 15/60 patients (25.0%), injuries of the cervical (9/60 patients, 15.0%), thoracic (12/60 patients, 20.0%), and lumbar spine (19/60 patients, 31.7%), pelvic injuries in 13/60 patients (21.7%), and injuries of extremities in 39/60 patients (65.0%). The mortality rate was 21.7%. (orig.)

  11. DIE NEUREGELUNG DES IFRS 10 ZUR ABGRENZUNG DES KONSOLIDIERUNGSKREISES – DIE ANWENDUNG DES EINHEITLICHEN BEHERRSCHUNGSMODELS AUF DIE ERFASSUNG VON STRUKTURIERTEN UNTERNEHMEN IM KONZERNABSCHLUSS

    OpenAIRE

    Markus Häfele

    2013-01-01

    In the past entities varied in their application of the control concept (IAS 27 and SIC-12) in circumstances in which a reporting entity controls another entity but holds less than a majority of the voting rights of the entity, and in circumstances involving agency relationships (IFRS 10.IN3). This conflict between IAS 27 and SIC-12 had led to inconsistent application of the concept of control. IAS 27 required the consolidation of entities that are controlled by a reporting entity, and it def...

  12. Photogalvanic effects induced by terahertz-lasers in semiconductor quantum films and applications; Terahertzlaserinduzierte photogalvanische Effekte in Halbleiter-Quantenfilmen und deren Anwendung

    Energy Technology Data Exchange (ETDEWEB)

    Weber, Wolfgang

    2008-06-16

    In this work photogalvanic effects where investigated in GaN/AlGaN heterostructures for the first time. For this purpose one of the strongest pulsed terahertz-lasers in the world was built and a computer controlled measurement system was developed. Additionally in this work an application of photogalvanic effects is presented, a pure-electric detection system, which allows to determine the polarisation state of terahertz radiation in sub-nanosecond time resolution. (orig.)

  13. Application of SiC masses as tube liners in municipal incinerators. Anwendung von SiC-Massen fuer Rohrverkleidungen in kommunalen Muellverbrennungsanlagen

    Energy Technology Data Exchange (ETDEWEB)

    Jeon, In Soo.

    1993-09-02

    Phosphate-bonded SiC masses with different additives were investigated. The reference mass was a SiC mass consisting of 90% by mass of SiC and 10% by mass of Al[sub 2]O[sub 3]. The reactive alumina ([alpha]-Al[sub 2]O[sub 3]) served as reaction partner for the aluminium phosphate binder. The physical and thermomechanical properties as well as the corrosion resistance of the developed SiC masses were investigated, and the reactions of the additives with the aluminium phosphate binder were investigated. The best combination of properties required of a refractory liner for waste incinerators was found in masses with Si[sub 3]N[sub 4] additives. These masses have optimal physical and thermomechanical properties and a high resistance to the corrosive gases and alkaline slags produced in modern incinerators. (orig./EF)

  14. Cobit-Framework and process control engineering. Application of Cobit-Process documentation ME3; Cobit-Framework und die Netzleittechnik. Anwendung der Cobit-Prozessbeschreibung ME3

    Energy Technology Data Exchange (ETDEWEB)

    Bosin, Erwin [Tiwag-Netz AG, Thaur (Austria). Prozessrechner und USV

    2009-11-16

    Cobit (Control Objectives for Information and related Technology) is an internationally recognised framework which offers two approaches to facilitating the operativeness of the power system management. One is aimed at the selection of the relevant processes needed for meeting business requirements and the other at identifying possible improvements to control and steering mechanisms in the selected processes. This is documented by the selected Cobit ME3 process (''Ensure Compliance With External Requirements''). The high security level of the power system management must be maintained in this context.

  15. Application of a complex transport problem for simulating an acid rain episode in Europe. Anwendung eines komplexen Ausbreitungsmodells zur Simulation einer Episode saurer Deposition ueber Europa

    Energy Technology Data Exchange (ETDEWEB)

    Stern, R; Scherer, B

    1989-04-01

    For the first time in Europe, a comprehensive Eulerian regional tropospheric transport, transformation and removal model has been applied to an european wide acid deposition episode. This model, the Transport And Deposition of Acidifying Pollutants (TADAP) model incorporated detailed knowledge of the relevant physicochemical processes which lead to the formation of photochemical oxidants and acidifying pollutants. The EUROPA-model (EUM) of the German Weather Service, a limited area numerical weather prediction model, has been used to derive the total meteorological cloud variables. The application of the EUM/TADAP-modelling system to a 20 day-wintertime acid deposition episode in Europe showed that it is possible to model the principal features of the acid deposition system. In general, there is reasonable agreement between observed and predicted concentration and deposition patterns. Most discrepancies from observed trends can be explained by deviations between the modelled and the actual meteorology. First sensitivity studies with TADAP directed to reveal the influence of emission changes on the acid deposition system showed that there are considerable non-proportionalities between depositions of secondary pollutants and the emissions of the respective precursors. The nonlinearities arise due to the chemical coupling of the SO{sub x}/No{sub x}/VOC-system. This makes the design of control strategies to a highly complex task. Strategies developed to tackle different air pollution problems can therefore not be looked upon independently. (orig.) With 47 refs., 42 figs.

  16. Impacts of energy crop cultivation on nature and landscape. Development and application of an evaluation method; Auswirkungen des Energiepflanzenanbaus auf Natur und Landschaft. Entwicklung und Anwendung einer Bewertungsmethode

    Energy Technology Data Exchange (ETDEWEB)

    Wiehe, Julia

    2011-08-15

    For long-term planning, knowledge about the interrelationship of effects of the cultivation method and the sensitivity of ecological balance is essential. Hence, the objective of this thesis is the development of a method for the evaluation of the impacts of bioenergy crop production for biogas use on the natural environment. The developed method is in alignment with existing methods. It is also in alignment with those methods used within the practice of landscape planning, so that the method as well as the derived conclusions can be implemented into landscape planning practice in the future. The evaluation method has been applied in the three model regions Hildesheim, Soltau-Fallingbostel and Emsland. These test areas represent different physical regions in Lower Saxony and typical agricultural production conditions. On the basis of these results, general statements on the impact of bioenergy crop production on the ecological balance of the area can be made. [German] Grundlage fuer eine vorausschauende Steuerung des Ausbaus erneuerbarer Energien ist die Kenntnis der Zusammenhaenge der Wirkung des Energiepflanzenanbaus und der Empfindlichkeit des Naturhaushaltes. Ziel der Arbeit ist daher die Erarbeitung einer Methode zur umfassenden Bewertung dieser Auswirkungen auf den Naturhaushalt. Die Methode orientiert sich an bereits bestehenden und in der Praxis der Landschaftsplanung angewendeten Bewertungsmethoden, so dass sie ebenso wie die daraus abgeleiteten Schlussfolgerungen zukuenftig Eingang in die Planungspraxis finden kann. Die Bewertungsmethode wird in den drei Modellregionen Hildesheim, Soltau-Fallingbostel und Emsland angewendet, mit denen die verschiedenen Naturraeume und fuer Niedersachsen typischen landwirtschaftlichen Produktionsbedingungen abgebildet werden. Auf Grundlage dieser Ergebnisse koennen dann allgemeine Aussagen zu den Auswirkungen des Energiepflanzenanbaus auf den Naturhaushalt gemacht werden.

  17. Thermal insulating materials consisting of polyurethane rigid foam. Production - application - properties. 2. ed.; Waermedaemmstoffe aus Polyurethan-Hartschaum. Herstellung - Anwendung - Eigenschaften

    Energy Technology Data Exchange (ETDEWEB)

    Endres, Edmund; Kleser, Joachim

    2008-02-15

    Using rigid polyurethane (PU) / polyisocyanurate (PIR) foam as a thermal insulation material enables a conservation of resources and energy conservation. Environmentally harmful emissions significantly are reduced. Under this aspect, the authors of the contribution report on the production, application, technical and physical properties of rigid polyurethane foams. Sustainable construction with rigid polyurethane foam, quality assurance and product certification are further topics of this paper.

  18. Non-medical application of radioactive materials or ionizing radiation. German legal regulations; Die Anwendung radioaktiver Stoffe oder ionisierender Strahlung ausserhalb der Medizin. Deutsche Rechtsvorschriften

    Energy Technology Data Exchange (ETDEWEB)

    Huhn, Walter [Ministerium fuer Arbeit, Integration und Soziales NRW, Duesseldorf (Germany); Lorenz, Bernd [Lorenz Consulting, Essen (Germany)

    2016-05-01

    Non-medical imaging is regulated in Germany since the 2011 radiation protection law amendment and the simultaneous X-ray regulation amendment based on the Euratom guideline 96/29. The regulations contain lists with justified and non-justified activities.

  19. Automation of ultrasonic testing, instrumentation and rules for application and evaluation. Proceedings; Automatisierung der Ultraschallpruefung, Geraetetechnik und Regeln zur Anwendung und Auswertung. Vortraege des Seminars

    Energy Technology Data Exchange (ETDEWEB)

    Wuestenberg, H. [comp.

    1997-12-31

    The proceedings volume contains 18 lectures of the seminar addressing the following (selected) aspects: Requirements to be met by PC cards for US testing applications, defined by producers and appliers; digital technology and its impact on multichannel US testing instruments; the ALOK and array systems combined into one very efficient testing system (SAPHIR); a testing system combining US radiation source arrays and the pulsed eddy current method by means of highly integrated microelectronics (ASICs); regulatory standards and specifications for automated US testing; requirements for automated US testing in compliance with nuclear engineering codes; state of the art in standardisation for definition of required properties of US testing systems; critical review of the proposed standard relating to the TOFD method; automated evaluation shown with the example of US testing of pipelines. (orig./CB) [Deutsch] Dieser Band enthaelt 18 Vortraege mit folgenden Themen (Auswahl): Anforderungen an Ultraschall-PC-Karten aus der Sicht von Hersteller und Betreiber; Einfluss der Digitaltechnik auf Mehrkanal-Ultraschall-Pruefanlagen; Vereinigung der ALOK- und der Gruppenstrahler-Technik in einem leistungsfaehigen Pruefsystem (SAPHIR); Ein kombiniertes Pruefsystem fuer die Ultraschall-Gruppenstrahler- und Impuls-Wirbelstrom-Technik auf der Basis von hochintegrierter Mikroelektronik (ASICs); Regelwerke und Spezifikationen fuer die automatisierte Ultraschallpruefung; Anforderungen der kerntechnischen Regelwerke an die automatisierte Ultraschallpruefung; Stand der Normung bei der Charakterisierung der Eigenschaften von Ultraschall-Pruefsystemen; Kritische Bewertung des Normungsvorschlages zur Beugungslaufzeittechnik (TOFD); und Automatisierte Auswertung am Beispiel der Ultraschallpruefung von Fernrohrleitungen. (orig.)

  20. Comparison Re-invented: Adaptation of Universal Methods to African Studies (Conference Report Die Wiederentdeckung des Vergleichs: Zur Anwendung universeller Methoden in der Afrikaforschung (Konferenzbericht

    Directory of Open Access Journals (Sweden)

    Franzisca Zanker

    2013-01-01

    Full Text Available Drawing from a combination of specific, empirical research projects with different theoretical backgrounds, a workshop discussed one methodological aspect often somewhat overlooked in African Studies: comparison. Participants addressed several questions, along with presenting overviews of how different disciplines within African Studies approach comparison in their research and naming specific challenges within individual research projects. The questions examined included: Why is explicit comparative research so rare in African Studies? Is comparative research more difficult in the African context than in other regions? Does it benefit our research? Should scholars strive to generalise beyond individual cases? Do studies in our field require an explicit comparative design, or will implicit comparison suffice? Cross-discipline communication should help us to move forward in this methodological debate, though in the end the subject matter and specific research question will lead to the appropriate comparative approach, not the other way round.Mit Blick auf einige empirische Forschungsprojekte mit jeweils unterschiedlichem theoretischem Hintergrund wurde im Rahmen eines Workshops ein methodologischer Aspekt debattiert, der in der Afrikaforschung wenig Beachtung erfährt: der Vergleich. Die Teilnehmer(innen entwickelten Fragestellungen, stellten jeweils dar, inwieweit in den verschiedene Disziplinen der Afrikaforschung der Vergleich als Methode eingesetzt wird, und benannten spezifische Herausforderungen in diesem Zusammenhang für einzelne Forschungsprojekte. Unter anderem wurden folgende Fragen erörtert: Warum ist die explizit vergleichende Methode in der Afrikaforschung so selten? Ist vergleichende Forschung im Kontext Afrikas schwieriger anwendbar als in der Forschung zu anderen Regionen? Verbessert sie unsere Forschungsresultate? Sollten sich Forscher um Generalisierungen jenseits der Einzelfallstudien bemühen? Ist in der Afrikaforschung eine explizit komparative Forschungsplanung notwendig oder reicht es, implizit zu Vergleichen zu kommen? Die Kommunikation zwischen den Disziplinen sollte zur Weiterentwicklung dieser methodologischen Debatte beitragen – doch letztendlich werden Gegenstandsbereich und spezifische Fragestellung eines Forschungsprojekts zu einem angemessenen komparativen Ansatz führen, nicht andersherum.

  1. Manual of contracts for the electricity sector. Contracts that work: Drafting and proper legal application. 2. rev. ed.; Vertragshandbuch Stromwirtschaft. Praxisgerechte Gestaltung und rechtssichere Anwendung

    Energy Technology Data Exchange (ETDEWEB)

    Schoene, Thomas (ed.)

    2014-07-01

    This manual deals fundamentally with the drafting of contracts for the electricity sector. It covers all types of contracts on both the customer and the network side with their various special clauses and variants, specifically: basic supply, substitute supply, supply contracts for private, commercial and industrial special customers as well as redistributors, EFET contracts, network access contracts, supplier framework contracts, feed-in contracts, grid connection contracts and connection use contracts. The manual also addresses questions concerning electricity customer insolvency, an issue of growing importance. The following topics are furthermore dealt with in a practically oriented manner and with care being taken to explain the underlying legal issues in readily understandable language. What basic framework conditions are specified by the new energy economy laws and general civil law? What possibilities are available in drafting contracts and what are the ramifications in each case? What subject matters in a contract are of particular economic significance? How can concession contracts be designed in a market-conforming way when there is strong competition for qualified rights of way? What opportunities and risks are associated with innovative products? What options for action does a supplier have in the event of (threatening) customer insolvency? Model contracts from day-to-day management practice and tips, checklists and cautioning notes round off this manual.

  2. Magnetic resonance imaging of the hand in rheumatoid arthritis. New scientific insights and practical application; Magnetresonanztomographie der Hand bei rheumatoider Arthritis. Wissenschaftliche Ergebnisse und praktische Anwendung

    Energy Technology Data Exchange (ETDEWEB)

    Hermann, K.G.A. [Charite - Universitaetsmedizin Berlin, Institut fuer Radiologie am Campus Mitte, Berlin (Germany)

    2006-05-15

    Magnetic resonance imaging (MRI) is a sensitive diagnostic modality for the detection of inflammatory changes in peripheral joints. Nevertheless, the widespread clinical use of MRI in assessing patients with early rheumatoid arthritis is still hampered by the technical complexity and higher cost of MRI compared with conventional radiography. This overview summarizes the results of recent research and gives practical tips on how to perform MRI of the hands. The authors present an MR protocol for hand imaging, discuss the pros and cons of low-field MR scanners, and outline pitfalls and artifacts. The MRI changes associated with rheumatoid arthritis such as synovitis, tenosynovitis, erosions, and bone marrow edema are described including their prognostic significance. The proven facts on the validation and grading of MR changes in rheumatoid arthritis are summarized. Finally, the role of MRI in the differential diagnosis of arthritis is critically discussed. (orig.) [German] Die Magnetresonanztomographie (MRT) ist ein sensitives Verfahren zur Detektion entzuendlicher Veraenderungen der peripheren Gelenke. Den breiten Einsatz der MRT im Fruehstadium der rheumatoiden Arthritis behindern derzeit jedoch der im Vergleich zur konventionellen Roentgendiagnostik hoehere technische Aufwand und vermehrte Kosten. Diese Uebersichtsarbeit fasst wichtige Studienergebnisse zusammen und gibt praktische Hinweise fuer Hand-MRTs. Ein geeignetes Sequenzprotokoll wird vorgestellt, Vor- und Nachteile von Niederfeld-MRTs werden beruecksichtigt, moegliche Fehlerquellen und Artefakte diskutiert. Magnetresonanztomographische Befunde bei rheumatoider Arthritis wie Synovitis, Tenosynovitis, Erosionen und Knochenmarkoedeme werden beschrieben und deren prognostische Bedeutung dargestellt. Gesicherte Fakten zur Validierung und Moeglichkeiten der Graduierung MR-tomographischer Veraenderungen bei rheumatoider Arthritis werden zusammengefasst. Der Nutzen der MRT zur differenzialdiagnostischen Abgrenzung von Arthritiden wird kritisch hinterfragt. (orig.)

  3. Anatomy of the fingers in MR imaging using a high resolution surface coil; Die Anatomie der Finger in der MRT unter Anwendung einer Hochaufloesungsspule

    Energy Technology Data Exchange (ETDEWEB)

    Maeurer, J. [Strahlenklinik und Poliklinik, Klinikum Rudolf Virchow, Standort Wedding, Freie Univ. Berlin (Germany); Mueller, H.F. [Strahlenklinik und Poliklinik, Klinikum Rudolf Virchow, Standort Wedding, Freie Univ. Berlin (Germany); Lemke, A.J. [Strahlenklinik und Poliklinik, Klinikum Rudolf Virchow, Standort Wedding, Freie Univ. Berlin (Germany); Requardt, R. [Siemens AG, Erlangen (Germany); Stein, I. [Strahlenklinik und Poliklinik, Klinikum Rudolf Virchow, Standort Wedding, Freie Univ. Berlin (Germany); Schedel, H. [Strahlenklinik und Poliklinik, Klinikum Rudolf Virchow, Standort Wedding, Freie Univ. Berlin (Germany); Langer, R. [Strahlenklinik und Poliklinik, Klinikum Rudolf Virchow, Standort Wedding, Freie Univ. Berlin (Germany); Felix, R. [Strahlenklinik und Poliklinik, Klinikum Rudolf Virchow, Standort Wedding, Freie Univ. Berlin (Germany)

    1994-12-31

    MR-images of the fingers of twenty healthy volunteers were obtained at a 1,5-T whole-body system with a high resolution coil. Additionally, the fingers of two formalin-fixed anatomical specismen were imaged, fronzen and then subsequently sectioned for anatomic correlation. Measurements were recorded with a slice thickness of 2 mm. A 256x256 matrix and a 2,5 cam fiel of view (FOV) were used resulting in a pixel size of 0,01 mm{sup 2}. Based on the excellent depiction of anatomic detail and contrast resolution high resolution MRI of the fingers enabled identification of osseous and cartilaginous structures, as well as delineation of tendons, ligaments blood-vessels and dermal layers. (orig.) [Deutsch] An einem 1,5-T-Ganzkoerpertomographen wurden die Finger von 20 gesunden Probanden mit einer Hochaufloesungsspule zur Darstellung der Anatomie untersucht. Zum Vergleich erfolgte die Abbildung der anatomischen Strukturen an zwei formol- und alkoholfixierten Leichepraeparaten der Hand mittels MRT. Im Anschluss wurden die untersuchten Regionen am tiefgefrorenen Praeparat mit einer Bandsaege nachgeschnitten. Die MR-Messungen wurden mit einer Schichtdicke von 3 mm, einem Field of View (FOV) von 25 mm und einer Matrix von 256x256 Pixel durchgefuehrt. Die daraus resultierende Pixelgroesse betrug 0,01 mm{sup 2}. Der Weichteilkontrast und die hohe Ortsaufloesung ermoeglichten die Identifikation von Knochen- und Knorpelstrukturen sowie die Abgrenzung von Sehnen, Baendern, Blutgefaessen und Hautschichten. (orig.)

  4. Application of molecular biological methods in groundwater and drinking water analysis. Papers and discussions; Anwendung molekularbiologischer Verfahren in der Grund- und Trinkwasseranalytik. Textbeitraege und Diskussionsergebnisse

    Energy Technology Data Exchange (ETDEWEB)

    Kuhlmann, B.; Preuss, G. (eds.)

    2000-07-01

    Water management and water supply make demands on microbiology which so far were difficult to meet. However, new molecular-biological methods were developed by ecologically oriented scientists which open up new options in groundwater and freshwater analysis. [German] Aus dem Bereich der Wasserwirtschaft und -versorgung werden vermehrt Anforderungen und Fragen an die Mikrobiologie gestellt, die bisher aufgrund der eingeschraenkten methodischen Moeglichkeiten nur unzureichend beantwortet werden konnten. In unterschiedlichen, meist oekologisch orientierten Forschungsbereichen wurden jedoch neue, im Wesentlichen molekularbiologische Methoden entwickelt, die auch in Hinblick auf die mikrobiologische Untersuchung des Grund- und Trinkwassers neue Perspektiven eroeffneten. (orig.)

  5. Molekularbiologische Analyse der genetischen Diversität des Melitaea athalia / celadussa-Komplexes (Lepidoptera: Nymphalidae) unter Anwendung der ISSR-PCR auf Art-, Unterart- und Populationsebene

    OpenAIRE

    Achtelik, Gerdo

    2006-01-01

    Mit Hilfe der ISSR-PCR wurde erstmalig eine großräumige Populationsanalyse bei einer Tagfalterart am Beispiel von Melitaea athalia vorgenommen. Es konnten fünf verwandte Arten der Nymphalidae - Melitaea diamina, M. cinxia und M. aurelia sowie Boloria euphrosyne und Issoria lathonia - untereinander sowie gegenüber M. athalia differenziert werden. 90 Primer wurden geprüft, 8 Primer amplifizierten allein für M. athalia 410 Marker. Bei allen Taxa wurde eine sehr hohe Polymorphismusrat...

  6. Lactobacilli and ionising radiation: an example of the application to meat and meat products. Laktobazillen und ionisierende Strahlung als Beispiel einer Anwendung auf Fleisch und Fleischprodukte

    Energy Technology Data Exchange (ETDEWEB)

    Holzapfel, W.H. (Inst. fuer Hygiene und Toxikologie, Bundesforschungsanstalt fuer Ernaehrung, Karlsruhe (Germany))

    1992-01-01

    Ionising radiation provides a practical pasteurisation method for the terminal treatment of refrigerated vacuum-packaged meat products with the aim of shelf life extension. However, the relatively high radiation resistance ([gamma]-D[sub 10] = 0.70-1.2 kGy) of typical meat Lactobacilli, especially Lb. sake, selectively favours their total domination after treatments with 5 kGy. Typical meat strains show higher resistance (in term of [gamma]-D[sub 10] values the decimal reduction value due to irradiation) in the log (exponential) than in the stationary phase. This phenomenon was observed both in semi-synthetic broth and in meat, and may be explained in terms of a DNA repair mechanism operative during the exponential phase. Packaging under different gas atmospheres resulted in increased resistance to radiation in presence of N[sub 2], whilst the highest death rate was observed in presence of CO[sub 2]. (orig.)

  7. 2015 DACH annual meeting. NDE in research, development and application. Abstracts; DACH-Jahrestagung 2015. ZfP in Forschung, Entwicklung und Anwendung. Vortraege

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2015-07-01

    The main topics of this meeting are: Computed Tomography; Air Ultrasound; Accreditation, certification, validation; CT algorithms; Ultrasound - imaging; Education; Digital X-ray detectors; Ultrasound - Simulation; Material characterization; Train; Phased Array; Aviation; Acoustic emission testing; Leak testing; Local defect resonance; Composite materials; Building construction; Standards and regulations; Condition and production monitoring; Surface method; POD; Renewable energy; Thermography. [German] Die Themenschwerpunkte auf dieser Tagung waren: Computertomographie; Luftultraschall; Akkreditierung, Zertifizierung, Validierung; CT Algorithmen; Ultraschall - Bildgebung; Ausbildung; Digitale Roentgendetektoren; Ultraschall - Simulation; Materialcharakterisierung; Bahn; Phased Array; Luftfahrt; Schallemissionspruefung; Dichtheitspruefung; Lokale Defektresonanz; Verbundwerkstoffe; Bauwesen; Normen und Regelwerke; Zustands- und Fertigungsueberwachung; Oberflaechenverfahren; POD; Erneuerbare Energien; Thermographie.

  8. The industrial application of fracture mechanics concepts discussed at the background of international standards and guidelines; Die industrielle Anwendung bruchmechanischer Konzepte vor dem Hintergrund internationaler Bewertungsvorschriften und Regelwerke

    Energy Technology Data Exchange (ETDEWEB)

    Zerbst, U. [GKSS-Forschungszentrum Geesthacht GmbH (Germany). Inst. fuer Werkstofforschung; Langenberg, P. [Ingenieurbuero fuer Werkstofftechnik, Aachen (Germany)

    2000-07-01

    Many features from the background for an intensified application of fracture mechanics concepts in many industries world-wide. These include requirements for a permanent increase of the level of performance of technical components and structures by the introduction of new materials, joining technologies and design principles, the problem of ageing components and life extension, an increased emphasis on non-destructive in-service inspection combined with improved NDT techniques, and also a number of failure events caused by fatigue and fracture The aim of the present paper is to give a brief state-of-the-art review on how fracture mechanics is applied in different industrial branches today. This is based on standards and guidelines in the aerospace industry, in the nuclear and fossil power generation, in the chemical and petrochemical and the pipeline industry, in civil engineering, offshore technique and other fields. Based on the review an outlook is given on a future development that would be reasonable and desirable from the point of view of a basically unified philosophy of fracture mechanics application. (orig.) [German] Die Erhoehung der Leistungsparameter vieler Maschinen und Anlagen verbunden mit dem Einsatz neuer Werkstoffe, Fuegeverfahren und Konstruktionsprinzipien, der Betrieb vieler Strukturen ueber ihre projektierte Lebensdauer hinaus, technische Verbesserungen und ein durchgaengigerer Einsatz zerstoerungsfreier Defektpruefverfahren, aber auch immer wieder einmal auftretende Schadensfaelle bilden den Hintergrund fuer die zunehmende Nutzung bruchmechanischer Bewertungsvorschriften in der industriellen Praxis. Die vorliegende Studie zieht eine momentane Bilanz dieser Entwicklung am Beispiel von Fachbereichsstandards der Luft- und Raumfahrtindustrie, der konventionellen und Kernkrafttechnik, der Chemie und Petrochemie, der Pipelineindustrie, des Stahlbaus, der Offshore-Technik und anderer Bereiche. Ausgehend von dieser Bestandsaufnahme wird ein Ausblick auf die weitere Entwicklung versucht, wie sie vom Standpunkt eines moeglichst einheitlichen Anwendungskonzeptes fuer die bruchmechanische Bauteilbewertung sinnvoll und wuenschenswert erscheint. (orig.)

  9. Building materials. Structure and technology, types and properties, application and handlings. 2. rev. ed. Baustoffkunde. Aufbau und Technologie, Arten und Eigenschaften, Anwendung und Verarbeitung der Baustoffe

    Energy Technology Data Exchange (ETDEWEB)

    Schaeffler, H

    1980-01-01

    Details are given on the large variety of structural and interior building materials. Reference is made to the relation between the structure and technology of building materials on one hand and the properties and handling of building materials on the other hand. The following subjects are dealt with: Fundamentals (historical development, systematy of building materials, regulations, properties, property warranties); natural stone; lumber and derived lumber products (properties, species of lumber, flaws, supply cuts); ceramic building materials and glass (brick, earthenware, refractory materials); building materials with mineral binders added, concrete and mortar (technology, setting); metals (properties, technology); bituminous building materials (technology, properties); plastics (thermoplasts, elastomers, duroplastics, paints, adhesives, synthetic-resin mortar and synthetic-resin concrete); insulating materials, organic floor coverings, papers and paperboard, paints, adhesives and sealing materials; damage to buildings (types, causes, responsibility, avoidance). (HWJ).

  10. Nephrogenic systemic fibrosis after application of gadolinium-based contrast agents - a status paper; Nephrogene systemische Fibrose nach Anwendung gadoliniumhaltiger Kontrastmittel - ein Statuspapier zum aktuellen Stand des Wissens

    Energy Technology Data Exchange (ETDEWEB)

    Heinrich, M.; Uder, M. [Erlangen-Nuernberg Univ., Erlangen (Germany). Inst. fuer Radiologie

    2007-06-15

    Recently the association of a rare disease named ''nephrogenic systemic fibrosis'' (NSF) with the administration of gadolinium-containing contrast media, especially gadodiamide (Omniscan, GE-Healthcare), was described. NSF is a scleroderma-like disease characterised by widespread tissue fibrosis. Until now, NSF cases were observed only in patients with kidney disease. Almost all patients were suffering from chronic renal insufficiency, 90 % of them required renal replacement therapy. The true incidence of the disease is unknown. First retrospective analyses of selected collectives of patients with end-stage renal disease showed 2 - 5 % cases of NSF after administration of Gadolinium-containing contrast agents with an odds ratio of 20 - 50 in comparison to non-exposed controls. NSF is a serious adverse reaction, which may result in severe disabilities and even death. Therefore all radiologists applying gadolinium-based contrast agents should be informed about this disease and the recent recommendations for its prevention. On the basis of the published data, Omniscan should not be used in patients with severe renal impairment (GFR < 30 ml/min/1.73 m{sup 2}) and those who have had or are undergoing liver transplantation. In neonates and infants up to 1 year of age, Omniscan should only be used after careful consideration. Also the other gadolinium-based contrast agents should be used in high-risk patients only after careful consideration using the lowest dose possible.

  11. Untersuchungen zur Expansion, funktionellen Charakterisierung und kontinuierlichen Bereitstellung von Hepatocyten für die Anwendung in bioartifiziellen Leberunterstützungssystemen

    OpenAIRE

    Iding, Kai

    2001-01-01

    Der vollständige Funktionsverlust der Leber kann in der modernen Medizin bisher nur durch den Austausch des funktionsuntüchtigen gegen ein gesundes Organ, d.h. durch eine Lebertransplantation behandelt werden. Da es jedoch weit mehr transplantationsbedürftige Patienten gibt als geeignete Spenderorgane zur Verfügung stehen, gibt es weltweite Anstrengungen zur Entwicklung alternativer Behandlungsmethoden. Nach bisherigem wissenschaftlichen Erkenntnisstand ist die bioartifizielle Leberunterst...

  12. Cutting down operating costs at sewage treatment plant through aimed application of new characterization methods; Betriebskostenreduzierung auf Klaeranlagen durch gezielte Anwendung neuer Charakterisierungsmethoden

    Energy Technology Data Exchange (ETDEWEB)

    Friedrich, H.; Potthoff, A. [Fraunhofer-Institut fuer Keramische Technologien und Sinterwerkstoffe (IKTS), Dresden (Germany); Friedrich, E. [Ingenieurgesellschaft fuer Wasser und Entsorgung mbH, Radebeul (Germany)

    1999-07-01

    Mechanical dewatering of sewage sludge is state of the art. Because of increasing cost, more stringent regulations (act on waste recycling 'Kreislaufwirtschaftsgesetz' and the technical code on municipal waste), and the lack of landfill space, expensive thermal processing techniques are gaining ever greater weight. To assure that disposal costs remain reasonable, mechanical dewatering must be more and more enhanced. The following need to be optimized and enhanced: sludge properties, conditioning, and dewatering. (orig.) [German] Klaerschlaemme maschinell zu entwaessern ist Stand der Technik. Steigende Kosten, verschaerfte Bestimmungen (Kreislaufwirtschaftsgesetz, TA Siedlungsabfall) und fehlende Deponien geben den teuren thermischen Behandlungsverfahren ein immer groesseres Gewicht. Damit die Entsorgung bezahlbar bleibt, muss immer staerker mechanisch entwaessert werden. Optimiert und verbessert werden muessen die Schlammeigenschaften, die Konditionierung und die Entwaesserung. (orig.)

  13. Control-technical optimization of topped denitrification through fuzzy control; Regelungstechnische Optimierung der vorgeschalteten Denitrifikation durch Anwendung von Fuzzy-Control

    Energy Technology Data Exchange (ETDEWEB)

    Meyer, U. [Hydroplan Ingenieurgesellschaft, Worms (Germany); Poepel, H.J. [Technische Univ. Darmstadt (Germany). Inst. WAR - Wasserversorgung, Abwassertechnik, Abfalltechnik, Umwelt- und Raumplanung

    1999-07-01

    The present paper describes complex fuzzy systems for controlling nitrogen elimination at plants with topped denitrification. For the design and testing of the fuzzy systems, dynamic simulation calculations and experimental tests were carried out in a semi-technical pilot plant. The controlling fuzzy systems indicate the supposed oxygen values for individual tank areas and the most appropriate partitioning of the activated sludge tank (anoxic/aerobic zone) as a function of the input quantities used. It is established that, with the more flexible control behaviour, a more stable nitrogen elimination and, at the same time, a cut in the amount of air transferred to the system can be attained in comparison with a conventional control. (orig.) [German] Im Rahmen dieses Beitrags werden komplexe Fuzzy-Systeme zur Regelung der Stickstoffelimination in Anlagen mit vorgeschalteter Denitrifikation vorgestellt. Zum Entwurf und zur Erprobung der Fuzzy-Systeme wurden dynamische Simulationsrechnungen und experimentelle Untersuchungen an einer halbtechnischen Versuchsanlage durchgefuehrt. Die uebergeordneten Fuzzy-Systeme geben in Abhaengigkeit der verwendeten Eingangsgroessen Sauerstoffsollwerte fuer die einzelnen Beckenbereiche und die jeweils guenstigste Aufteilung des Belebungsbeckens (anoxische/aerobe Zone) vor. Die Ergebnisse zeigen, dass durch das flexible Reglerverhalten eine stabilere Stickstoffelimination und gleichzeitig eine Einsparung an eingetragener Luftmenge im Vergleich zu einem konventionellen Regelsystem erreicht werden kann. (orig.)

  14. Screening und Quantifizierung organischer Spurenstoffe mittels UPLC-HRMS:Entwicklung von Methoden und Anwendung zur Unterscheidung historischer und aktueller Spurenstoffe in einem ehemaligen Rieselfeld

    OpenAIRE

    Wode, Florian

    2014-01-01

    Aufgrund zunehmender Wasserknappheit gewinnt die Nutzung von gereinigtem Abwasser (Klarwasser), bezeichnet als Water Reuse, weltweit an Bedeutung. Neben herkömmlichen chemischen und mikrobiologischen Parametern spielen organische Spurenstoffe zunehmend eine Rolle bei der Beurteilung der Wasserqualität, die über mögliche Nutzungsformen entscheidet. In dieser Arbeit wurde die Spurenstoffbelastung in Grund- und Oberflächenwasser eines ehemaligen Rieselfeldgebietes untersucht, in dem seit 2005 Kl...

  15. Deep desulfurization of jet fuel for applications in mobile fuel cell systems; Tiefentschwefelung von Flugturbinenkraftstoffen fuer die Anwendung in mobilen Brennstoffzellensystemen

    Energy Technology Data Exchange (ETDEWEB)

    Wang, Yong

    2012-07-01

    Fuel cell powered APUs are promising for the on-board electricity supply in heavy vehicles, aircraft and ships because of their high efficiency and low emission of pollutants. The catalytical reforming with subsequent gas processing units is applied to operate the fuel cell system with onboard available fuels. Within the reformer the liquid fuel is converted into a hydrogen-rich synthesis gas in the presence of metal catalysts. However, an on-board desulfurization of fuels is required to avoid the deactivation of catalysts in the fuel processing unit as well as in the fuel cell. The present work aims at developing a technically feasible deep desulfurization process for fuel cell powered APUs with theoretical and experimental study as well as procedural analysis. The focus of the work is on the desulfurization of jet fuels in liquid phase, since the reformer currently developed in IEK-3 is designed for aviation applications of fuel cell APUs and it can only be operated by liquid jet fuels. In addition, the desulfurization of marine gas oil was investigated to fulfill the sulfur requirement of the fuels for the application of fuel cell A PUs for inland navigation. In the petroleum industry, low-sulfur fuels are often obtained by hydrodesulfurization and the S-Zorb Process. However, these conventional methods are highly inconvenient for reducing sulfur compounds to the desired level in a mobile fuel cell system, since improvements of the desulfurization efficiency are limited by increasingly severe operating conditions and escalating costs. Moreover, the hydrodesulfurization and the S-Zorb Process are not suitable for mobile applications, since hydrogen recycling is required, which is not possible with H{sub 2} syngas. To this end, a large number of processes discussed in the literature were assessed with regard to their application in fuel cell APUs. Three potentially suitable processes were selected: pervaporation, adsorption, and hydrodesulfurization with pre-saturation. Within a series of experiments in the laboratory, these processes were investigated with respect to their desulfurization ability and durability, while the required heat amount and electrical energy demand were determined by modeling and simulation. Subsequently, the potential of the desulfurization processes for technical applications were evaluated by a procedural and energetic analysis. As a result, the hydrodesulfurization with presaturation is most suitable for desulfurization of jet fuels for the application of fuel cell driven APUs in aircraft. A combination of pervaporation and adsorption is although applicable for the desulfurization of jet fuel and marine gas oil, more research work is required to increase the long-term stability of the membrane material. (orig.)

  16. Entwicklung und Anwendung bildgebender Verfahren für die Messung der elektrischen Feldstärke mit Hilfe der Lochbrennspektroskopie

    OpenAIRE

    Balzer, Herbert

    2002-01-01

    In der Arbeit wird ein neues bildgebendes Verfahren zur optischen Sensorik der elektrischen Feldstärke vorgestellt, das auf der laserspektroskopischen Methode des stabilen spektralen Lochbrennens beruht. Hierbei erfolgt die Bestimmung der Feldstärkeverteilung durch Messung der E-Feldinduzierten Änderung der Absorption im Zentrum eines stabilen spektralen Loches, das mit einem schmalbandigen Laser in das Absorptionsspektrum einer Sensorschicht, bestehend aus dem Polymer Polyvinylbutyral dotier...

  17. Considerations on the application in supermarkets. The high performance air cooler in the course of time; Ueberlegungen fuer die Anwendung im Supermarkt. Der Hochleistungsluftkuehler im Wandel der Zeit

    Energy Technology Data Exchange (ETDEWEB)

    Lich, Mathias [GEA Kueba GmbH, Baierbrunn (Germany)

    2011-08-15

    In the last twenty years, the high performant air cooler has undergone a rapid development. Power, energy efficiency and compact size an important role in the selection for the application in the supermarket. The development of the technology of EC fans shows that there always are potentials for an optimal development of products. While an air cooler needed a current consumption of 180 W for the fan twenty years ago, now significantly less than 100 W are necessary. Fan diameter, pipe diameter, shell size and all incorporated components have become more powerful and more efficient.

  18. Clinical use of 'ROTOP-NEUROSPECT' in several brain diseases. Die klinische Anwendung von 'ROTOP-NEUROSPECT' bei verschiedenen hirnorganischen Erkrankungen

    Energy Technology Data Exchange (ETDEWEB)

    Wuensche, A.; Kaempfer, I.; Loessner, J.; Wagner, A.; Dietrich, J.; Strauss, I.; Neumann, G.; Otto, L.; Koegler, A.; Schenk, S.; Schneider, G. (Leipzig Univ., Klinik fuer Radiologie, Abt. Nuklearmedizin (Germany) Leipzig Univ. (Germany). Klinik fuer Neurologie Leipzig Univ. (Germany). Klinik fuer Neurochirurgie Bezirkskrankenhaus fuer Psychiatrie, Leipzig-Doesen (Germany))

    1990-01-01

    We proofed the suitibility of ROTOP-NEUROSPECT (R*) (HMPAO) from Rossendorf for consideration of disturbed brain circulation in 42 patients. Results we compared with morphological methods (X-ray computing tomography, angiography) and with clinical and neurological findings. We found often a disturbed brain circulation in emission computing tomography (SPECT) before morphological changes in X-ray computing tomography (CT). ROTOP-NEUROSPECT (R*) from Rossendorf is very well for consideration of disturbed brain circulation, we did not see quality differences between ROTOP-NEUROSPECT and CERETEC from Amersham. Activity accumulations in the liver and gall of both radiopharmaceuticals did not influence the test, because of the big distance to the brain. (orig.).

  19. Optimisation of the enforcement of energy regulations and the use of SIA building standards; Optimierung Energievollzug und Anwendung der SIA-Normen Gebaeude

    Energy Technology Data Exchange (ETDEWEB)

    Dettli, R.; Baur, M.; Signer, B. [Econcept AG, Zuerich (Switzerland); Renaud, P.; Wermeille, Ch. [Planair, Bureau d' ingenieurs SIA, La Sagne (Switzerland)

    2003-07-01

    This report for the Swiss Federal Office of Energy (SFOE) presents the results of a study made on the effectiveness of the enforcement of energy legislation and the value of standards in planning and building activities. The reasons for deficiencies in the enforcement of regulations are examined and suggestions are made for improving the situation. Enforcement problems are discussed, including, for example, the partly insufficient capacities at the building authority level. Detailed measures are proposed at the federal and cantonal level and better training and know-how for building professionals is recommended. Those responsible for enforcement - usually the local authorities - are advised to improve the communication of their supervisory activities. Certain improvements to legislation are proposed and professional institutions are motivated to improve quality management and the know-how of their members. The report is completed with a comprehensive list of literature on the subject.

  20. Incentives for development and application of environmentally friendly biotechnological products and processes; Anreize fuer die Entwicklung und Anwendung umweltfreundlicher biotechnischer Produkte und Verfahren

    Energy Technology Data Exchange (ETDEWEB)

    Rhein, Hans-Bernhard; Endler, Katharina [Umweltkanzlei Dr. Rhein, Sarstedt (Germany); Ulber, Roland; Muffler, Kai; Mueller, Felix [Technische Univ. Kaiserslautern (Germany)

    2011-01-15

    Studies assign a tremendous growth potential related to biotechnology. However, the predicted proportion of biotechnological manufactured products in the chemical industry for the year 2010 by 20 % will more likely remain by today's 5 %. The study deals with the question why biotechnological products are currently established at the market in the obvious slow way. Therefore, the current constraints and existing respectively new incentive instruments referring to the white (industrial) biotechnology are analyzed to focus on the promotion of the development and application of environmentally friendly biotechnology products and methods. In addition to a search concerning environmental relevance and further development of white biotechnology, the postulated constraints and incentives as well as new promotions are discussed with the help of expert interviews. On the basis of a preliminary study - after further discussion with experts - concrete proposals on improvements related to an ongoing establishment of biotechnology will be derived. Based on case studies (2nd generation biofuels, polyhydroxybutyrate as biopolymer and phytase as an animal feed additive), the practical effects and specific conditions to incentives, from the perspective of biotechnological processes and environmentally friendly products are investigated. Overall, about 40 activities were recommended, which could be assigned to areas of direct government incentives (tax policy/subsidies, subsidies, education and research policy, basic political conditions, government demand and information policy/consumer intelligence) as well as non-governmental incentives (knowledge transfer and cooperation, organisation-related policy, capital market financing). (orig.)

  1. Application of molecular calcium compounds in catalysis and hydrogen storage; Anwendung von molekularen Calcium-Verbindungen in der Katalyse und der Wasserstoffspeicherung

    Energy Technology Data Exchange (ETDEWEB)

    Spielmann, Jan

    2010-07-20

    1. Applications in catalysis: In the course of this work new catalytic applications of calcium compounds and in particular hydrocarbon-soluble calcium hydride species have been investigated. The complex [(DIPP-nacnac)CaH(THF)]2 (1, DIPP-nacnac = HC[C(Me)N-2,6-(i-Pr)-C6H3]2) served as a model system to test reactivity of the calcium hydride in stoichiometric reactions on a molecular level. It has been found that the hydroboration of conjugated alkenes with catecholborane can be accelerated considerably by using catalytic amounts of calcium complexes. However it was shown that calcium hydride species catalyze the decomposition of catecholborane to BH3 which is probably the catalytically active species. Investigations on the catalytic hydrosilylation of ketones have demonstrated that calcium complexes are efficient catalysts for this reaction. In the proposed catalytic cycle of this reaction six-coordinate hypervalent silicon species play a crucial role. Furthermore it has been shown that molecular calcium compounds are catalysts for the hydrogenation of conjugated alkenes with H2 under relatively mild conditions (20 bar H2, 20 C). Both steps in the proposed catalytical cycle i.e. addition of a metal hydride to the C=C double bond and a heterolytic cleavage of H2 by a calcium alkyl compound have been confirmed experimentally. 2. Applications in hydrogen storage: Ligand stabilized metal amidoborane complexes in the form of (DIPP-nacnac)MNH(R)BH3(THF)x (M = Ca, Mg; R = H, Me, i-Pr, 2,6-(i-Pr)-C6H3; x = 0, 1, 2) have been synthesized and structurally characterized. These complexes are model systems for the metal amidoborane compounds M(NH2BH3)n (M = Li, Na, n = 1; M = Ca, n = 2), which are potential high capacity hydrogen storage materials. To get insights in their dehydrogenation mechanisms the thermal decomposition of the model compounds was investigated in solution. This allowed for the first isolation of well-defined dehydrogenated products which have been structurally characterized. Depending on the metal and the sterical bulk of the substituent R the decomposition resulted in the clean formation of complexes with either a central dianionic [N(R)-BH-N(R)-BH3]2--unit (R = H, Me, i-Pr), a compound containing a borylamide [N(R)=BH2]- (R = 2,6-(i Pr)-C6H3) or a metal hydride complex. For the observed products mechanisms of their formation have been proposed and experimentally confirmed. In these mechanisms metal hydride species play a key role. The favoured decomposition pathway leads to formation of compounds with the central dianionic [N(R)-BH-N(R)-BH3]2--unit. Additionally a magnesium-catalyzed synthetic route to a bis(amino)borane HB[NH(DIPP)]2 has been developed which can form a novel boramidinate ligand {l_brace}HB[N(2,6-(i-Pr)-C6H3)]2{r_brace}2- by double deprotonation. Furthermore a preparative useful synthetic route to zinc and aluminium hydride complexes based on the use of amidoborane compounds has been described. By using novel bis({beta}-diketiminate) ligands it has been possible to prepare dinuclear magnesium amidoborane complexes. The investigation of their thermal decomposition gave important information on aggregation effects of the complexes during the dehydrogenation. As a decomposition product of a N-substituted, dinuclear magnesium amidoborane complex a tetranuclear magnesium hydride complex has been isolated in low yields. Alternatively such compounds have been prepared in good yields by reaction of a n butylmagnesium precursor with phenylsilane. This synthetic approach allowed also the preparation of an octanuclear magnesium hydride complex with a central paddle-wheel shaped [Mg8H10]-unit. These multinuclear magnesium hydride complexes could be considered as ligand-stabilized forms of MgH2 and could be valuable model systems for investigations on MgxHy-hydrogen storage materials. (orig.)

  2. Simulation, optimization, and heuristic in practical application: requirements, state of the art, and development perspectives; Simulation, Optimierung und Heuristik in der praktischen Anwendung: Anforderungen, Stand und Entwicklungsperspektiven

    Energy Technology Data Exchange (ETDEWEB)

    Toelle, F.J.

    1997-12-01

    Process Simulation is routine in chemical engineering and process analysis. This article traces the early developments of process simulation of flowsheeting. Dramatically new expectations and visions are emerging for software tools used in chemical process modeling and simulation. Many companies anticipate a rapid migration of process modeling software to an open architecture. The software components exploit object-oriented pragmatics, including abstraction, encapsulation, inheritance and polymorphism. We discuss the software architecture of tools supporting process synthesis and operations optimization. (orig.) [Deutsch] Als Simulation bezeichnen wir ein experimentelles Vorgehen, bei dem wir bestimmte Eigenschaften eines tatsaechlichen oder auch gedachten technischen, wirtschaftlichen, biologischen Systems nicht am Original selbst, sondern ersatzweise an einem geeigneten Modell des Originals, dem sogenannten Simulator, untersuchen. Bezogen auf die Prozess- und Verfahrenstechnik sind dies primaer funktionelle und systemdynamische Eigenschaften, wie zum Beispiel ein Kraftwerksblock, den wir moeglichst genau dem Original nachbilden. Dabei werden nur jene Aspekte des realen Verhaltens nachgebildet, die vom Modellierer als notwendig erachtet werden. Ein guter Simulator liefert in der Regel eine bequeme und umfassende, zeit- und kostenguenstige, gelegentlich sogar einzige praktikable Moeglichkeit zum Studium aller Betriebszustaende und Eigenschaften des Originals. (orig.)

  3. Development of the microphone array measurement technique for application to cryogenic wind tunnels; Entwicklung der Mikrofonarraymesstechnik fuer die experimentelle Anwendung in kryogenen Windkanaelen

    Energy Technology Data Exchange (ETDEWEB)

    Ahlefeldt, Thomas

    2013-02-01

    The present work deals with the development of the microphone array measurement technique for application to cryogenic wind tunnels at temperatures down to 100 K. In contrast to conventional wind tunnels, in cryogenic wind tunnels the Reynolds number can be changed independent of the Mach number. Therefore the applicability of the microphone array measurement technique to cryogenic wind tunnels allows the independent investigation of Mach and Reynolds number effects for aeroacoustic sources. For this purpose two microphone arrays suitable for cryogenic application have been developed. A small array was used for a validation experiment using a single-rod configuration as an aeroacoustic noise source; the experience gained therefrom being then used to develop a larger array. This array was used to finally demonstrate the applicability of the measuring technology to an airplane half model. For the development of both arrays several factors had to be considered, such as, for example, the contraction arising from the low temperatures and the influence of the temperature on the microphone frequency response. In the validation experiment, acoustic array measurements have been performed using the small microphone array with 21 microphones in a cryogenic wind tunnel for various Mach and Reynolds numbers, using a single-rod configuration. The aeroacoustic source induced by the rod could be identified by the microphone.array at ambient as well as at cryogenic temperatures. The radiated sound powers were compared with predictions from two models: one model was based on a dimensional analysis of the measured data without taking into consideration the Reynolds number. The measured data with this model could be better fitted by a speed law with the exponent 6.7 rather than the expected 6.0. The second model was based on an analytical model for sound radiation from a single-rod configuration which took into account variables dependent on the Reynolds number. The comparison with this model showed very good agreement in that the u{sup 6} power law was shown to apply. The important outcome of this validation experiment was that the data measured in the cryogenic environment let to meaningful experimental results. In the demonstration experiment the sound radiation of an airplane half model in a high-lift configuration in a cryogenic wind tunnel was examined with a large microphone array, which consisted of 144 microphones. Aeroacoustic sources were localised at ambient as well as at cryogenic temperatures on different areas of the wing, such as, for example, at the leading edge flap, the trailing flap tip or the Krueger's flap. The radiated sound showed a dependence on the Reynolds number for the whole model as well as for different source areas. This was in particular the case for two source areas: First, dominant tones were identified in the vicinity of the leading edge, but which then disappeared with a rise of the Reynolds number. Second, a narrow band source could be seen on the turbulence generator on the nacelle, for which a scaling to the Mach number with M{sup 6} and a systematic dependence on the Reynolds- and Strouhal numbers could be shown. To sum up, the results of the investigation on the half model demonstrated successfully the applicability of the measurement technique developed within the scope of this work.

  4. Shared technologies in the development of the Titan 250 trademark gas turbine system; Anwendung bewaehrter Technologien bei der Entwicklung des Titan 250 trademark Gasturbinensystems

    Energy Technology Data Exchange (ETDEWEB)

    Stang, Ulrich; Knodle, Mark; Novaresi, Mark [Solar Turbines, Inc., San Diego, CA (United States); Ottoboni, Luigi [Turbomach SA, Riazzino (Switzerland)

    2010-07-01

    The Titan 250 gas turbine and C85 centrifugal gas compressor are the latest additions to the Solar Turbines product family. These new products leverage core technologies that have been developed and proven in several other well-established products. The Titan 250 gas turbine is a conservative hybrid design grounded in advanced aerodynamic, thermal and mechanical design tools and methodologies. It is ISO rated at 22.4 MW (30,000 HP), with a best-in-class shaft efficiency of 40% reducing fuel costs and emissions. The engine is a two-shaft design that includes a 16-stage axial flow compressor (PR 24:1), a dry low emissions combustor (<15 ppmv NOx), a two-stage gas producer turbine operating at a firing temperature of 1200 C (2200 F), and a three-stage, maximum efficiency, fully shrouded power turbine. (orig.)

  5. Codoped emission layers for the application in white, organic light-emitting diodes; Kodotierte Emissionsschichten zur Anwendung in weissen, organischen Leuchtdioden

    Energy Technology Data Exchange (ETDEWEB)

    Steinbacher, Frank

    2012-07-01

    In this dissertation, the first step towards an application of mixed emission layers in highly efficient white OLEDs is an investigation of the underlying exciton transfer process. Simple, solution processable samples of dispersed phosphorescent dye molecules in a PMMA matrix are investigated by (time-resolved) photoluminescence. An optimized yellow OLED acts as a starting point for the use of a mixed emission layer in highly efficient white OLEDS. Although some adaptation of existing layouts is needed, it is possible to introduce mixed emission layers into regular as well as stacked white diode concepts. An evaporation technique which uses a combination of two dyes in one crucible is tested for its applicability. Although rate detection can be simplified in that way, different evaporation properties of the materials lead to a continuously changing composition in the mixed crucible. In summary, the fundamental exciton transfer process in mixed emission layers was investigated and explained in simple setups as well as complete OLEDs. (orig.)

  6. Application of the in-beam PET therapy monitoring on precision irradiations with helium ions; Anwendung des in-beam PET Therapiemonitorings auf Praezisionsbestrahlungen mit Helium-Ionen

    Energy Technology Data Exchange (ETDEWEB)

    Fiedler, F.

    2008-02-19

    The main goal of the present dissertation was to extend the in-beam PET method to new ion types. It was shown that the in-beam PET method can also be applied for {sup 3}He irradiations. For this experiments on a {sup 3}He beam were performed. The activity yield is at equal applied dose about three times larger than at {sup 12}C irradiations. The reachable range resolution is smaller than 1 mm. At the irradiation of an inhomogeneous phantom it was shown that a contrast between different materials is resolvable. From the experimentally determined reaction rates cross sections for the reactions leading to positron emitters were performed. The data taken in the {sup 3}He experiments were compared those obtained in carbon-ion experiments as well as literature data for proton irradiations. A comparison with the calculations of the simulation program SHIELD-HIT was performed. A collection of cross-section models and the established requirements for a simulation program applicable for in-beam PET are preparing for further work.

  7. Recommendation for the application of the guideline for incorporation monitoring in nuclear medicine; Empfehlung fuer die Anwendung der Richtlinie zur Inkorporationsueberwachung in der Nuklearmedizin

    Energy Technology Data Exchange (ETDEWEB)

    Schoenmuth, T. [Verein fuer Kernverfahrenstechnik und Analytik Rossendorf e.V. (VKTA), Dresden (Germany); Dalheimer, A. [Bundesamt fuer Strahlenschutz (Germany); Eckardt, J. [Universitaetsklinikum Muenster (Germany); Eschner, W. [Universitaetsklinikum Koeln (Germany); Kratzel, U. [LfU Bayern (Germany); Lassmann, M. [Universitaetsklinikum Wuerzburg (Germany); Lauterbach, H. [Universitaetsklinikum Jena (Germany); Dettmann, K.

    2009-07-01

    For the use of open radioactive materials in the nuclear medicine a recommendation should give assistance by the judgement of the draught suggested by the user according to the guideline 'Incorporation monitoring' to the responsible authorities. To the evaluation of the requirement for a regular monitoring the document delivers recommendations for incorporation factors or use of threshold value measurements. (orig.)

  8. sup 123 I-tyrosine-(A14)-insulin: preparation and preliminary clinical studies. sup 123 I-tyrosin-(A14)-Insulin: Entwicklung und erste klinische Anwendung

    Energy Technology Data Exchange (ETDEWEB)

    Pantev, T; Virgolini, I; Sinzinger, H; Prager, R; Neuhold, N; Angelberger, P; Banyai, M; Knoebl, P [Oesterreichisches Forschungszentrum Seibersdorf GmbH (Austria). Inst. fuer Chemie Vienna Univ. (Austria). Abt. fuer Nuklearmedizin

    1991-01-01

    Insulin was radioiodinated with {sup 123}I ({sup 123}I-tyrosine-(A14)-insulin) to a specific activity of 1 {mu}g/mCi, corresponding to 0.025 I.U. of insulin/mCi. This preparation was used for in vitro binding experiments with adipose tissue, showing active binding to the two subunits of the known insulin receptor. In a preliminary clinical investigation, 5 adipose patients with (n = 2) and without (n = 3) diabetes mellitus Type II, were subject to in vivo injection of the same radiolabeled product using 3 mCi/patient. During the first minutes of dynamic imaging, the liver was the major organ of tracer uptake in all patients. Furthermore, the pancreas, and in one patient the kidneys, were visualised. Further studies on insulin in vivo kinetics and quantification are under way. (authors).

  9. ACOPLAMIENTO EXCITATORIO E INHIBITORIO DE NEURONAS PULSANTES ACOPLADAS

    Directory of Open Access Journals (Sweden)

    Francis Armando Segovia Chaves

    2012-05-01

    Full Text Available La información es representada como patrones de actividad neuronal o pulsos, lo que crea una diferencia significante entre las redes neuronales pulsantes y las redes neuronales clásicas. Una característica diferente de las redes neuronales pulsantes es que la información es codificada en patrones de actividad neuronal y estas se comunican usando trenes de pulsos en lugar de valores individuales. Además, este tipo de redes neuronales pulsantes trabajan con una gran cantidad de neuronas donde se requiere grandes recursos computacionales para ser simuladas. En el presente trabajo se realiza un análisis teórico de las redes neuronales pulsantes,  para el caso de dos neuronas acopladas. Se logra obtener teóricamente las condiciones para acoplamiento excitatorio e inhibitorio en las neuronas.

  10. Servicio Amazon Web Services de clasificación primaria de imágenes de fuentes hídricas del piedemonte amazónico que usan redes neuronales

    Directory of Open Access Journals (Sweden)

    Edwin Eduardo Millán Rojas

    2014-05-01

    Full Text Available En la presente investigación se parte de la determinación de un problema que se encuentra hoy en día en muchos campos de las organizaciones que se dedican a la investigación, como lo es la Universidad de la Amazonia, en la cual existen grupos de investigación que generan altos volúmenes de información gráfica. Estos fueron tomados como base para realizar un procesamiento inteligente que permita clasificar los tipos de agua en su nivel primario y determinar si se puede llevar esta clasificación a un servicio web desplegado en la nube y consumido desde una aplicación móvil desarrollada para dispositivos con sistema operativo Android.

  11. Aplicación de un modelo Perceptrón Multicapa de redes neuronales artificiales para la clasificación del comportamiento de pago en clientes en mora en una entidad de cobranza

    OpenAIRE

    Cabezas Arias, Lady Pamela; Parra Romo, Nelson Antonio

    2017-01-01

    El riesgo financiero constituye uno de los índices principales para el monitoreo de la economía de un país, sin embargo debido a varios factores macroeconómicos, como riesgo de iliquidez, riesgo de mercado, riesgo de variación en el proceso de bonos, los clientes de las instituciones financieras a las que se acude para solicitar un préstamo o aplicar algún tipo de garantía a cambio de un valor monetario presentan distintos comportamientos en su historial de pagos lo que dificulta la generació...

  12. Neutron spectrometry and dosimetry with neural networks and Bonner spheres: a study to reduce the spheres number; Espectrometria y dosimetria neutronica con redes neuronales y esferas Bonner: un estudio para reducir el numero de esferas

    Energy Technology Data Exchange (ETDEWEB)

    Espinoza G, J. G.; Martinez B, M. R.; Leon P, A. A.; Hernandez P, C. F.; Castaneda M, V. H.; Solis S, L. O.; Castaneda M, R.; Ortiz R, J. M.; Vega C, H. R. [Universidad Autonoma de Zacatecas, Av. Ramon Lopez Velarde 801, Col. Centro, 98000 Zacatecas, Zac. (Mexico); Mendez, R. [Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas, Laboratorio de Patrones Neutronicos, Av. Complutense 22, 28040 Madrid (Spain); Gallego, E. [Universidad Politecnica de Madrid, Departamento de Ingenieria Nuclear, C. Jose Gutierrez Abascal 2, 28006 Madrid (Spain); De Sousa L, M. A. [Centro de Desenvolvimento da Tecnologia Nuclear / CNEN, Av. Pte. Antonio Carlos 6627, Pampulha, 31270-901 Belo Horizonte, MG (Brazil)

    2016-10-15

    For neutron spectrometry and neutron dosimetry, the Bonner spheres spectrometric system has been the most widely used system, however, the number, size and weight of the spheres composing the system, as well as the need to use a reconstruction code and the long periods of time used to carry out the measurements are some of the disadvantages of this system. For the reconstruction of the spectra, different techniques such as artificial neural networks of reverse propagation have been used. The objective of this work was to reduce the number of Bonner spheres and to use counting speeds in a reverse propagation neural network, optimized by means of the robust design methodology, to reconstruct the neutron spectra. For the design of the neural network we used the neutron spectra of the IAEA and the response matrix of the Bonner spheres with {sup 6}LiI(Eu) detector. The performance of the network was compared; using 7 Bonner spheres against other cases where only 2 and one sphere are used. The network topologies were trained 36 times for each case keeping constant the objective error (1E(-3)), the training algorithm was trains cg and the robust design methodology to determine the best network architectures. With these, the best and worst results were compared. The results obtained using 7 spheres were similar to those with the 5-in sphere, however is still in an information analysis stage. (Author)

  13. Relación entre el envejecimiento y la morfología de los registros de variación de diámetro arterial: clasificación con redes neuronales artificiales

    Directory of Open Access Journals (Sweden)

    Fernando M. Clara

    2005-01-01

    Full Text Available Relation between Aging and the Morphology of Radial Artery Diameter Variation Registers: Classification Using Artificial Neural Networks Aníbal R. Introzzi, Lucía I. Passoni, Adriana G. Scandurra, Gustavo J. Meschino, Fernando M. Clara The aim of this study was to assess the modification of the radial artery diameter variation signal in accordance with aging. The signal was registered via an acquisition system using a capacitive transducer leaning on the skin at the level of the radial artery. In order to assess the relation between loss of distensibility and signal modifications due to aging, the experiment was carried out on a group of 64 normotensive subjects: 20 youths, 24 adults and 20 elderly men. Morphological descriptive parameters were obtained and the potentiality to classify the arterial diameter variation waves according to aging was evaluated with a Kohonen artificial neural network. Signal analysis processing revealed the presence of three constituent waves: two systolic waves, first and second, and a diastolic wave. Aging produces important changes in signal conformation, such as expansion of the first systolic wave, decrease of the diastolic wave amplitude and rise of the second systolic wave approaching and overlapping the vertex of the first systolic wave. The artificial neural network correctly classified the 64 registrations, locating them in their corresponding age cluster. Considering the absence of illness in the sample subjects, the existence of a healthy arterial aging pattern is revealed. This system could be able to detect early evidence of arterial pathology development involving an increment of arterial stiffness with a loss of compliance (sclerosis, hypertension.

  14. Artificial neural network based model to calculate the environmental variables of the tobacco drying process; Modelo basado en redes neuronales artificiales para el cálculo de parámetros ambientales en el proceso de curado del tabaco

    Directory of Open Access Journals (Sweden)

    Víctor Martínez-Martínez

    2013-06-01

    Full Text Available This paper presents an Artificial Neural Network (ANN based model for environmental variables related to the tobacco drying process. A fitting ANN was used to estimate and predict temperature and relative humidity inside the tobacco dryer: the estimation consists of calculating the value of these variables in different locations of the dryer and the prediction consists of forecasting the value of these variables with different time horizons. The proposed model has been validated with temperature and relative humidity data obtained from a real tobacco dryer using a Wireless Sensor Network (WSN. On the one hand, an error under 2% was achieved, obtaining temperature as a function of temperature and relative humidity in other locations in the estimation task. Besides, an error around 1.5 times lower than the one obtained with an interpolation method was achieved in the prediction task when the temperature inside the tobacco mass was predicted with time horizons over 2.5 hours as a function of its present and past values. These results show that ANN-based models can be used to improve the tobacco drying process because with these types of models the value of environmental variables can be predicted in the near future and can be estimated in other locations with low errors.

  15. Optimization of artificial neural networks for the reconstruction of the neutrons spectrum and their equivalent doses; Optimizacion de redes neuronales artificiales para la reconstruccion del espectro de neutrones y sus dosis equivalentes

    Energy Technology Data Exchange (ETDEWEB)

    Reyes A, A.; Ortiz R, J. M.; Reyes H, A.; Castaneda M, R.; Solis S, L. O.; Vega C, H. R., E-mail: art8291@hotmail.com [Universidad Autonoma de Zacatecas, Unidad Academica de Ingenieria Electrica, Av. Lopez Velarde No. 801, Col. Centro, 98000 Zacatecas (Mexico)

    2014-08-15

    In this work was used the robust design methodology of artificial neural networks to determine a good topology of net able to solve with efficiency the problems of neutrons spectrometry and dosimetry. For the design of the topology of optimized net 36 different net architectures based on an orthogonal arrangement with a configuration L{sub 9}(3{sup 4}), L{sub 4}(3{sup 2}) were trained. For the training of the neural networks, was used a computer code developed in the ambient of Mat lab programming, which automates the process and analysis of the information, reducing the time used in this activity considerably for the investigator. For the training of the propagation nets forward was utilized a neutrons spectrum compendium published by the International Atomic Energy Agency, where of the total 80% was used for the training and 20% for the test, it trained with an inverse propagation algorithm being the entrance data the count rates corresponding to the 7 spheres of the spectrometric system of Bonner spheres, as exit data, the neural network obtains the neutrons spectrum expressed in 60 energy groups and are calculated of simultaneous way 15 dosimetric quantities. (Author)

  16. Prediction of the temperature of the atmosphere of the primary containment: comparison between neural networks and polynomial regression; Prediccion de la temperatura de la atmosfera de la contencion primaria: comparativa entre redes neuronales y regresion polinomial

    Energy Technology Data Exchange (ETDEWEB)

    Alvarez Huerta, A.; Gonzalez Miguelez, R.; Garcia Metola, D.; Noriega Gonzalez, A.

    2011-07-01

    The modelization is carried out through two different techniques, a conventional polynomial regression and other based on an approach by neural networks artificial. He is a comparison between the quality of the forecast would make different models based on the polynomial regression and neural network with generalization by Bayesian regulation, using the indicators of the root of the mean square error and the coefficient of determination, in view of the results, the neural network generates a prediction more accurate and reliable than the polynomial regression.

  17. Aplicación de las redes neuronales artificiales para la estratificación de riesgo de mortalidad hospitalaria Application of artificial neural networks for risk stratification of hospital mortality

    Directory of Open Access Journals (Sweden)

    J. Trujillano

    2003-12-01

    Full Text Available Objetivo: Comparar la capacidad de predicción de mortalidad hospitalaria de una red neuronal artificial (RNA con el Acute Physiology and Chronic Health Evaluation II (APACHE II y la regresión logística (RL, y comparar la asignación de probabilidades entre los distintos modelos. Método: Se recogen de forma prospectiva las variables necesarias para el cálculo del APACHE II. Disponemos de 1.146 pacientes asignándose aleatoriamente (70 y 30% al grupo de Desarrollo (800 y al de Validación (346. Con las mismas variables se genera un modelo de RL y de RNA (perceptrón de 3 capas entrenado por algoritmo de backpropagation con remuestreo bootstrap y con 9 nodos en la capa oculta en el grupo de desarrollo. Se comparan los tres modelos en función de los criterios de discriminación con el área bajo la curva ROC (ABC [IC del 95%] y de calibración con el test de Hosmer-Lemeshow C (HLC. Las diferencias entre las probabilidades se valoran con el test de Bland-Altman. Resultados: En el grupo de validación, el APACHE II con ABC de 0,79 (0,75-0,84 y HLC de 11 (p = 0,329; modelo RL, ABC de 0,81 (0,76-0,85 y HLC de 29 (p = 0,0001, y en RNA, ABC de 0,82 (0,77-0,86 y HLC de 10 (p = 0,404. Los pacientes con mayores diferencias en la asignación de probabilidad entre RL y RN (8% del total son pacientes con problemas neurológicos. Los peores resultados se obtienen en los pacientes traumáticos (ABC inferior a 0,75 en todos los modelos. En los pacientes respiratorios, la RNA alcanza los mejores resultados (ABC = 0,87 [0,78-0,91]. Conclusiones: Una RNA es capaz de estratificar el riesgo de mortalidad hospitalaria utilizando las variables del sistema APACHE II. La RNA consigue mejores resultados frente a RL, sin alcanzar significación, ya que no trabaja con restricciones lineales ni de independencia de variables, con una diferente asignación de probabilidad individual entre los modelos.Objective: To compare the ability of an artificial neural network (ANN to predict hospital mortality with that of the Acute Physiology and Chronic Health Evaluation II (APACHE II system and multiple logistic regression (LR. A secondary objective was to compare the allocation of individual probability among the models. Method: The variables required for calculating the APACHE II were prospectively collected. A total of 1146 patients were divided (randomly 70% and 30% into the Development (800 and the Validation (346 sets. With the same variables an LR model and an ANN were carried out (a 3-layer perceptron trained by algorithm backpropagation with bootstrap resampling and with 9 nodes in the hidden layer in the Development set. The models developed were contrasted with the Validation set and their discrimination properties were evaluated using the area under the ROC curve (AUC [95% CI] and calibration with the Hosmer-Lemeshow C (HLC test. Differences between the probabilities were evaluated using the Bland-Altman test. Results: The Validation set showed an APACHE II with an AUC = 0.79 (0.75-0.84 and HLC = 11 (p = 0.329; LR model AUC = 0.81 (0.76-0.85 and HLC = 29 (p = 0.0001 and an ANN AUC = 0.82 (0.77-0.86 and HLC = 10 (p = 0.404. The patients with the most important differences in the allocation of probability between LR and ANN (8% of the total were neurological. The worst results were found in trauma patients with an AUC of not greater than 0.75 in all the models. In respiratory patients, the ANN achieved the best AUC = 0.87 (0.78-0.91. Conclusions: The ANN was able to stratify hospital mortality risk by using the APACHE II system variables. The ANN tended to achieve better results than LR, since, in order to work, it does not require lineal restrictions or independent variables. Allocation of individual probability differed in each model.

  18. Realce de imágenes mamográficas mediante técnicas basadas en histograma para su clasificación por medio de redes neuronales convolucionales

    OpenAIRE

    Yébenes Calvo, Belén

    2016-01-01

    El cáncer de mama es una enfermedad que actualmente afecta a una de cada ocho mujeres en el mundo, presente también en hombres aunque con una incidencia menor. Esta patología comienza con una división descontrolada de células producida por una alteración en los genes encargados de controlar los procesos de división y crecimiento celular, dando lugar a la formación de un nódulo o tumor. Estos tumores pueden ser benignos, los cuales no suponen un riesgo para la salud o malignos, denominados ta...

  19. Design of a computation tool for neutron spectrometry and dosimetry through evolutionary neural networks; Diseno de una herramienta de computo para la espectrometria y dosimetria de neutrones por medio de redes neuronales evolutivas

    Energy Technology Data Exchange (ETDEWEB)

    Ortiz R, J. M.; Vega C, H. R. [Universidad Autonoma de Zacatecas, Unidad Academica de Ingenieria Electrica, Av. Ramon Lopez Velarde No. 801, Col. Centro, Zacatecas (Mexico); Martinez B, M. R. [Universidad Autonoma de Zacatecas, Unidad Academica de Estudios Nucleares, Av. Ramon Lopez Velarde No. 801, Col. Centro, Zacatecas (Mexico); Gallego, E. [Universidad Politecnica de Madrid, Departamento de Ingenieria Nuclear, Jose Gutierrez Abascal No. 2, E-28006 Madrid (Spain)], e-mail: morvymmyahoo@com.mx

    2009-10-15

    The neutron dosimetry is one of the most complicated tasks of radiation protection, due to it is a complex technique and highly dependent of neutron energy. One of the first devices used to perform neutron spectrometry is the system known as spectrometric system of Bonner spheres, that continuous being one of spectrometers most commonly used. This system has disadvantages such as: the components weight, the low resolution of spectrum, long and drawn out procedure for the spectra reconstruction, which require an expert user in system management, the need of use a reconstruction code as BUNKIE, SAND, etc., which are based on an iterative reconstruction algorithm and whose greatest inconvenience is that for the spectrum reconstruction, are needed to provide to system and initial spectrum as close as possible to the desired spectrum get. Consequently, researchers have mentioned the need to developed alternative measurement techniques to improve existing monitoring systems for workers. Among these alternative techniques have been reported several reconstruction procedures based on artificial intelligence techniques such as genetic algorithms, artificial neural networks and hybrid systems of evolutionary artificial neural networks using genetic algorithms. However, the use of these techniques in the nuclear science area is not free of problems, so it has been suggested that more research is conducted in such a way as to solve these disadvantages. Because they are emerging technologies, there are no tools for the results analysis, so in this paper we present first the design of a computation tool that allow to analyze the neutron spectra and equivalent doses, obtained through the hybrid technology of neural networks and genetic algorithms. This tool provides an user graphical environment, friendly, intuitive and easy of operate. The speed of program operation is high, executing the analysis in a few seconds, so it may storage and or print the obtained information for further analysis and treatment. (Author)

  20. Memoria técnica descriptiva de la realización de un artículo científico relacionado con la identificación del origen de sonidos por redes neuronales

    OpenAIRE

    Carangui Velecela, Cristian Gabriel

    2017-01-01

    La presente memoria técnica realiza una introducción al proceso desarrollado para realizar el artículo científico "SOUND SOURCE IDENTIFICATION THROUGH NEURAL NETWORKS", en este documento se presenta una descripción detallada de los elementos importantes que se usaron en este proyecto. The present technical report makes an introduction to the process developed to carry out the scientific paper "SOUND SOURCE IDENTIFICATION THROUGH NEURAL NETWORKS", this document presents a detailed descripti...

  1. Predicción por redes neuronales artificiales de la calidad fisicoquímica de vinagre de melaza de caña por efecto de tiempo- temperatura de alimentación a evaporador-destilador flash

    OpenAIRE

    Vásquez, Víctor; Lescano, Carlos

    2010-01-01

    It was predicted via Artificial Neural Networks (ANN) important physicochemical characteristics of molasses vinegar: pH, density, total acidity, ethanol, total aldehydes and furfural, obtained by flash evaporation operations and flash distillation clarification. Alcoholic and acetic fermented molasses were fed to a flash evaporator at four temperatures (61, 66, 71 and 76 ° C) and in three times (25, 35 and 45 min). The prediction was made with two networks: ANN and ANN-A-B, both with good per...

  2. Forecasting of time series with trend and seasonal cycle using the airline model and artificial neural networks Pronóstico de series de tiempo con tendencia y ciclo estacional usando el modelo airline y redes neuronales artificiales

    Directory of Open Access Journals (Sweden)

    J D Velásquez

    2012-06-01

    Full Text Available Many time series with trend and seasonal pattern are successfully modeled and forecasted by the airline model of Box and Jenkins; however, this model neglects the presence of nonlinearity on data. In this paper, we propose a new nonlinear version of the airline model; for this, we replace the moving average linear component by a multilayer perceptron neural network. The proposedmodel is used for forecasting two benchmark time series; we found that theproposed model is able to forecast the time series with more accuracy that other traditional approaches.Muchas series de tiempo con tendencia y ciclos estacionales son exitosamente modeladas y pronosticadas usando el modelo airline de Box y Jenkins; sin embargo, la presencia de no linealidades en los datos son despreciadas por este modelo. En este artículo, se propone una nueva versión no lineal del modelo airline; para esto, se reemplaza la componente lineal de promedios móviles por un perceptrón multicapa. El modelo propuesto es usado para pronosticar dos series de tiempo benchmark; se encontró que el modelo propuesto es capaz de pronosticar las series de tiempo con mayor precisión que otras aproximaciones tradicionales.

  3. ESTUDIO DE SERIES TEMPORALES DE CONTAMINACIÓN AMBIENTAL MEDIANTE TÉCNICAS DE REDES NEURONALES ARTIFICIALES TIME SERIES ANALYSIS OF ATMOSPHERE POLLUTION DATA USING ARTIFICIAL NEURAL NETWORKS TECHNIQUES

    Directory of Open Access Journals (Sweden)

    Giovanni Salini Calderón

    2006-12-01

    Full Text Available Se diseñó una red neuronal artificial (RNA para hacer predicciones de valores de concentraciones horarias de material particulado fino en la atmósfera. El estudio está basado en los datos de tres años de series de tiempo de pm2.5 (material particulado suspendido de 2,5 micrones de diámetro, obtenidos en una estación céntrica de la Red MACAM de la ciudad de Santiago de Chile, entre los años 1994 y 1996. Para obtener el espaciamiento óptimo de los datos, así como el número de datos hacia atrás necesarios para pronosticar el valor futuro, se aplicaron dos test estándar usados en estudio de sistemas dinámicos, como Información Mutua promedio (AMI y Falsos Vecinos más Cercanos (FNN. De esta manera se encontró que lo más conveniente era considerar como entrada los datos de PM2.5 cada seis horas durante un día (cuatro datos, y en base a ellos predecir el dato siguiente. Una vez fijo el número de variables de entrada y elegida la variable a pronosticar, se diseñó un modelo predictivo basado en la técnica de RNA. El tipo de modelo de RNA usado fue uno de multicapas, alimentado hacia adelante y entrenado mediante la técnica de propagación hacia atrás. Se probaron redes sin capa oculta y con una y dos capas ocultas. El mejor modelo resultó ser con una capa oculta, a diferencia de lo obtenido en trabajo anterior que reportaba que la red sin capa oculta era más eficiente. Los resultados fueron más precisos que los obtenidos con un modelo de persistencia (el valor en seis horas más será el mismo que el actual.An artificial neural network for the forecasting of concentrations of fine particulate matter in the atmosphere was designed. The data set analyzed corresponds to three years of pm2.5 time series (particulate matter in suspension with aerodynamic diameter less than 2,5 microns, measured in a station that belongs to Santiago's monitoring network (Red MACAM and is located near downtown. We consider measurements of concentrations between May and August for years between 1994 and 1996. In order to find the optimal time spacing between data and the number of values into the past necessary to forecast a future value, two standard tests were performed, Average Mutual Information (AMI and False Nearest Neighbours (FNN. The results of these tests suggest that the most convenient choice for modelling was to use 4 data with 6 hour spacing on a given day as input in order to forecast the value at 6 AM on the following day. Once the number and type of input and output variables are fixed, we implemented a forecasting model based on the neural network technique. We used a feedforward multilayer neural network and we trained it with the backpropagation algorithm. We tested networks with none, one and two hidden layers. The best model was one with one hidden layer, in contradiction with a previous study that found that minimum error was obtained with a net without hidden layer. Forecasts with the neural network are more accurate than those produced with a persistence model (the value six hours ahead is the same as the actual value.

  4. Reconstruction of neutron spectra using neural networks starting from the Bonner spheres spectrometric system; Reconstruccion de espectros de neutrones usando redes neuronales a partir del sistema espectrometrico de esferas de Bonner

    Energy Technology Data Exchange (ETDEWEB)

    Ortiz R, J.M.; Martinez B, M.R.; Arteaga A, T.; Vega C, H.R.; Hernandez D, V.M.; Manzanares A, E. [Universidad Autonoma de Zacatecas, A.P. 336, 98000 Zacatecas (Mexico)

    2005-07-01

    The artificial neural networks (RN) have been used successfully to solve a wide variety of problems. However to determine an appropriate set of values of the structural parameters and of learning of these, it continues being even a difficult task. Contrary to previous works, here a set of neural networks is designed to reconstruct neutron spectra starting from the counting rates coming from the detectors of the Bonner spheres system, using a systematic and experimental strategy for the robust design of multilayer neural networks of the feed forward type of inverse propagation. The robust design is formulated as a design problem of Taguchi parameters. It was selected a set of 53 neutron spectra, compiled by the International Atomic Energy Agency, the counting rates were calculated that would take place in a Bonner spheres system, the set was arranged according to the wave form of those spectra. With these data and applying the Taguchi methodology to determine the best parameters of the network topology, it was trained and it proved the same one with the spectra. (Author)

  5. Self-organizing neural networks for automatic detection and classification of contrast-enhancing lesions in dynamic MR-mammography; Selbstorganisierende neuronale Netze zur automatischen Detektion und Klassifikation von Kontrast(mittel)-verstaerkten Laesionen in der dynamischen MR-Mammographie

    Energy Technology Data Exchange (ETDEWEB)

    Vomweg, T.W.; Teifke, A.; Kauczor, H.U.; Achenbach, T.; Rieker, O.; Schreiber, W.G.; Heitmann, K.R.; Beier, T.; Thelen, M. [Klinik und Poliklinik fuer Radiologie, Klinikum der Univ. Mainz (Germany)

    2005-05-01

    Purpose: Investigation and statistical evaluation of 'Self-Organizing Maps', a special type of neural networks in the field of artificial intelligence, classifying contrast enhancing lesions in dynamic MR-mammography. Material and Methods: 176 investigations with proven histology after core biopsy or operation were randomly divided into two groups. Several Self-Organizing Maps were trained by investigations of the first group to detect and classify contrast enhancing lesions in dynamic MR-mammography. Each single pixel's signal/time curve of all patients within the second group was analyzed by the Self-Organizing Maps. The likelihood of malignancy was visualized by color overlays on the MR-images. At last assessment of contrast-enhancing lesions by each different network was rated visually and evaluated statistically. Results: A well balanced neural network achieved a sensitivity of 90.5% and a specificity of 72.2% in predicting malignancy of 88 enhancing lesions. Detailed analysis of false-positive results revealed that every second fibroadenoma showed a 'typical malignant' signal/time curve without any chance to differentiate between fibroadenomas and malignant tissue regarding contrast enhancement alone; but this special group of lesions was represented by a well-defined area of the Self-Organizing Map. Discussion: Self-Organizing Maps are capable of classifying a dynamic signal/time curve as 'typical benign' or 'typical malignant'. Therefore, they can be used as second opinion. In view of the now known localization of fibroadenomas enhancing like malignant tumors at the Self-Organizing Map, these lesions could be passed to further analysis by additional post-processing elements (e.g., based on T2-weighted series or morphology analysis) in the future. (orig.)

  6. Aplicación del modelo neurodifuso ANFIS vs redes neuronales, al problema predictivo de caudales medios mensuales del río Bogotá en Villapinzón

    Directory of Open Access Journals (Sweden)

    Edagar Gómez Vargas

    2010-12-01

    Full Text Available This paper shows the results in the exploration of the benefits of the implementation of neuro-fuzzy ANFIS model and neural networks for the prediction of monthly mean flows in the basin of Bogota River in Villapinzón. The ANFIS model is developed, implemented and the performance of six models is evaluated bychanging entries number, number and type of fuzzy sets (membership functions, which are the basic parameters of the ANFIS model. The results are compared with those obtained with multilayer perceptron neural networks.

  7. Organisation de l'activité neuronale cérébelleuse lors de d'une tâche de préhension et reste dans des rats déplaçant librement

    OpenAIRE

    Gao , Hongying

    2012-01-01

    The cerebellum is a brain structure involved in coordination complex motor actions such as voluntary movements. To achieve this function, the precise temporal control of a large population of neurons is required. While a large number of patterned population activity has been characterized in many major brain structures (thalamo-cortical system, basal ganglia, hippocampal formation, etc...), very little is currently known in the cerebellum. Therefore, I investigated the presence and characteri...

  8. A comparison between genetic algorithms and neural networks for optimizing fuel recharges in BWR; Una comparacion entre algoritmos geneticos y redes neuronales para optimizar recargas de combustible en BWR's

    Energy Technology Data Exchange (ETDEWEB)

    Ortiz J, J. [Instituto Nacional de Investigaciones Nucleares, Depto. Sistemas Nucleares, A.P. 18-1027, 11801 Mexico D.F. (Mexico); Requena, I. [Universidad de Granada (Spain)

    2002-07-01

    In this work the results of a genetic algorithm (AG) and a neural recurrent multi state network (RNRME) for optimizing the fuel reload of 5 cycles of the Laguna Verde nuclear power plant (CNLV) are presented. The fuel reload obtained by both methods are compared and it was observed that the RNRME creates better fuel distributions that the AG. Moreover a comparison of the utility for using one or another one techniques is make. (Author)

  9. studio comparativo de parametrización de un sistema de redes neuronales artificiales evolutivas para la predicción de series temporales y herramienta software para realizar esa predicción

    OpenAIRE

    Lobato Álvarez, Miguel Ángel

    2012-01-01

    Hoy en día el uso de la inteligencia artificial (IA) y, concretamente de las dos ramas de la misma usadas en este trabajo: los AGs y las RNAs, se puede encontrar en todo lo que nos rodea en el día a día. Así se pueden ver sistemas que organizan la mercancía que llega a la empresa optimizando su espacio de almacenamiento, sistemas que reconocen la huella dactilar al fichar a la entrada y salida de una oficina, aplicaciones que reconocen las caras de personas en las fotos que subes a I...

  10. Quasistatic field simulations based on finite elements and spectral methods applied to superconducting magnets; Quasistatische Feldsimulationen auf der Basis von Finiten Elementen und Spektralmethoden in der Anwendung auf supraleitende Magnete

    Energy Technology Data Exchange (ETDEWEB)

    Koch, Stephan

    2009-03-30

    This thesis is concerned with the numerical simulation of electromagnetic fields in the quasi-static approximation which is applicable in many practical cases. Main emphasis is put on higher-order finite element methods. Quasi-static applications can be found, e.g., in accelerator physics in terms of the design of magnets required for beam guidance, in power engineering as well as in high-voltage engineering. Especially during the first design and optimization phase of respective devices, numerical models offer a cheap alternative to the often costly assembly of prototypes. However, large differences in the magnitude of the material parameters and the geometric dimensions as well as in the time-scales of the electromagnetic phenomena involved lead to an unacceptably long simulation time or to an inadequately large memory requirement. Under certain circumstances, the simulation itself and, in turn, the desired design improvement becomes even impossible. In the context of this thesis, two strategies aiming at the extension of the range of application for numerical simulations based on the finite element method are pursued. The first strategy consists in parallelizing existing methods such that the computation can be distributed over several computers or cores of a processor. As a consequence, it becomes feasible to simulate a larger range of devices featuring more degrees of freedom in the numerical model than before. This is illustrated for the calculation of the electromagnetic fields, in particular of the eddy-current losses, inside a superconducting dipole magnet developed at the GSI Helmholtzzentrum fuer Schwerionenforschung as a part of the FAIR project. As the second strategy to improve the efficiency of numerical simulations, a hybrid discretization scheme exploiting certain geometrical symmetries is established. Using this method, a significant reduction of the numerical effort in terms of required degrees of freedom for a given accuracy is achieved. The problem-tailored discretization approach is based on a geometrical modeling of reduced spatial dimension inside respective domains of symmetry. For the approximation of the electromagnetic fields, orthogonal polynomials along the direction of symmetry are combined with finite element shape functions at the remaining cross-section. This leads to an efficient method providing a high accuracy. The domains of symmetry are embedded into the surrounding region by means of a strong coupling at the discrete level in terms of a domain decomposition approach. Using this strategy, for certain examples a level of accuracy corresponding to numerical models featuring several millions of degrees of freedom in classical finite element methods can be achieved with only one hundred thousand unknowns. This is demonstrated for different examples, e.g., a cylindrical power transformer and the already mentioned accelerator magnet. (orig.)

  11. 1834 till 2009 - review of 175 years of wire rope development and application in the mining industry; 1834 bis 2009 - Rueckblick auf 175 Jahre Drahtseilentwicklung und Anwendung im Bergbau

    Energy Technology Data Exchange (ETDEWEB)

    Dill, Rainer [Verein fuer Technische Sicherheit und Umweltschutz e.V. (TSU), Gotha (Germany); DMT GmbH und Co. KG, Leipzig (Germany)

    2010-03-15

    Inspector of Mines Albert is the main focus of attention in this contribution. Hence in particular the creative and technically brilliant work since his entry into the Harz mining industry are described in addition to his career. Thanks to his untiring efforts a usable wire rope was introduced into mining industry for the first time in 1834. However, the inventive genius and technical skill of Muehlenpfordt and Mummenthey, employees of the Koenigshuette in Lauterberg, also deserve praise, because they were the first to supply suitable wires for the manufacture of a rope. (orig.)

  12. Application of the inter-line PCR for the analyse of genomic rearrangements in radiation-transformed mammalian cell lines; Anwendung der Inter-Line PCR zur Analyse von genomischen Veraenderungen in strahlentransformierten Saeugerzellinien

    Energy Technology Data Exchange (ETDEWEB)

    Leibhard, S.; Smida, J. [Muenchen Univ. (Germany). Strahlenbiologisches Inst.; Eckardt-Schupp, F.; Hieber, L. [GSF-Inst. fuer Strahlenbiologie, Oberschleissheim (Germany)

    1996-12-31

    Repetitive DNA sequences of the LINE-family (long interspersed elements) that are widely distributed among the mammalian genome can be activated or altered by the exposure to ionizing radiation [1]. By the integration at new sites in the genome alterations in the expression of genes that are involved in cell transformation and/or carcinogenesis may occur [2, 3]. A new technique - the inter-LINE PCR - has been developed in order to detect and analyse such genomic rearrangements in radiation-transformed cell lines. From the sites of transformation- or tumour-specific changes in the genome it might be possible to develop new tumour markers for diagnostic purpose. (orig.) [Deutsch] Repetitive DNA-Sequenzen der LINE-Familie, die weit verbreitet im Genom von Saeugerzellen vorkommen, koennen durch Exposition mit ionisierender Strahlung aktiviert und veraendert werden [1]. Durch eine Neu- bzw. Reintegration an anderen Positionen im Genom kann es zu bedeutenden Veraenderungen im Genom der Zelle kommen. Die Expression von Genen, die bei den Prozessen der Zelltransformation bzw. der Karzinogenese beteiligt sind, kann dadurch veraendert werden [2, 3]. Mithilfe der von uns entwickelten Inter-LINE PCR und der anschliessenden Analyse der veraenderten Produktmuster nach gelelektrophoretischer Auftrennung koennen solche `genomic rearrangements` unter Beteiligung von LINE-Elementen untersucht und naeher charakterisiert werden. Durch Klonierung und Sequenzierung transformations- bzw. tumorspezifischer PCR-Produkte sollte es moeglich sein Tumormarker fuer diagnostische Zwecke zu entwickeln. Die Methode wurde fuer die Analyse von Zellen des Syrischen Hamster aufgebaut, sie ist jedoch universell fuer alle Saeuger anwendbar. (orig.)

  13. Investigations of glass sealing and reactive air brazing materials for joining high temperature solid oxide fuel cells by dilatometric examinations; Anwendung dilatometrischer Messungen bei der Entwicklung von Glasloten und reaktiven Metallloten zum Fuegen von Hochtemperaturbrennstoffzellen

    Energy Technology Data Exchange (ETDEWEB)

    Reichle, M.S. [Parker Hannifin GmbH, Bietigheim-Bissingen (Germany); Federmann, D. [Forschungszentrum Juelich GmbH, ZAT, Juelich (Germany); Reisgen, U. [RWTH Aachen University, ISF, Aachen (Germany); Koppitz, T.

    2011-03-15

    The principle of operation of solid oxide fuel cells (SOFCs) is very simple. However, the fact that very different materials are used for the individual components requires advanced thermal joining techniques to join them in a functional manner. Two very distinct designs have established themselves for the two different intended applications: decentralised power generation (stationary SOFCs) on the one hand, and power converters for vehicles (mobile SOFCs) on the other hand. As a consequence, alternative techniques for joining the individual components are also required. The principal joining process for the stationary SOFC design consists of joining individual steel plates with a glass sealant in an electrically insulating way so that they form an SOFC stack. For the mobile fuel cell design, the SOFC stack consists of individual thin steel cassettes. The window frame of the cassettes, which is made of ferritic chromium steel, is brazed to the ceramic layer of the zirconium oxide solid electrolyte using a filler metal. The material used is a silver-based brazing filler metal which contains only small amounts of copper oxide (CuO) and titanium hydride (TiH{sub 2}) as wetting agents. Both joining processes must be applicable in normal atmospheric air, i. e. under oxidative conditions. R and D activities continue for improving the efficiency and long-term operational stability of the technology to such an extent that SOFCs will become ready for the energy sector market. The two joining techniques described cannot yet be considered standard processes. They, too, will require continuous improvement with respect to reproducibility, endurance and strength of the joints. The Special Joining Techniques working group at Forschungszentrum Juelich uses specially modified dilatometric techniques as suitable quick replacement methods for studying and measuring the joining characteristics of the materials without having to manufacture complex and expensive SOFC stacks. The shrinkage processes in the glass sealant joints are simulated and measured in the {mu}m range using a special dilatometer. In this way, the amount of glass sealant - which is decisive for tightness and bonding - and the process parameters can be determined in advance. With a vertical dilatometer, the melting behaviour of the reactive silver filler metals is examined with respect to melting point shift, viscosity and void ratio, and as a function of the metal additives (Al) and the process atmosphere.

  14. Scaling up manufacturing of ZnO thin layers for application in flexible dye-sensitized solar cells; Aufskalierung der Herstellung von ZnO-Duennschichten fuer die Anwendung in flexiblen farbstoffsensibilisierten Solarzellen

    Energy Technology Data Exchange (ETDEWEB)

    Bittner, Florian

    2012-10-19

    Flexible solar cells possess good future prospects for versatile mobile applications and can provide an important environmental benefit. One of the technologies permitting flexible solar cells is that of dye-sensitized solar cells. Among other advantages the fabrication of these organic-inorganic hybrid solar cells promises to be inexpensive in comparison to other technologies. Nanoparticular TiO{sub 2} is used predominantly as the semiconducting photoanode material; however its preparation route contains a tempering step at about 450 C, which impedes the use of flexible plastic substrates - at least with the method established for dye-sensitized solar cells. An alternative to TiO{sub 2} is ZnO, which can be fabricated for example in an electrochemical process at temperatures of only 70 C in the form of porous quasicrystalline layers. To create porosity the dye eosin Y is used as structure-directing agent. In the context of this study layers prepared by this method were compared to ZnO layers prepared by screen printing. This was performed on glass based substrates. Better conversion efficiency has been determined for dye-sensitized solar cells based on electrochemical deposited layers, while other results indicated advantages for the screen printed layers. As the morphologies of the available screen printed layers proved to be unfavourable and poorly comparable, a concluding statement on the suitability of the different types of layers was eventually not possible. Furthermore a technical simple and inexpensive method for the platinum coating of plastic substrates, which are used as counter electrodes, was tried to be determined. However, layers prepared by technically relatively complex sputtering exhibited by far better properties than layers prepared by electrochemical deposition or by chemical reduction of platinum salts. Thus, the targeted objective has not been reached. The central scope of this study was the development of an electrochemical deposition setup to demonstrate the suitability for scale-up of the fabrication method of ZnO/eosin Y hybrid layers. This miniplant setup was characterised in detail and appropriate deposition parameters have been determined. Porous ZnO layers have been prepared successfully on FTO glass substrates on an area of 38.88 cm{sup 2} and on ITO-PET plastic substrates on an area of 34.56 cm{sup 2}. The suitability of the fabricated layers for the assembly of flexible dye-sensitized solar cells has been demonstrated by means of several operative modules. While these modules achieved decent conversion efficiencies of up to 2.58 % under low light intensities, strongly decreasing conversion efficiencies were observed with increasing light intensities. Too high series resistances have been identified as the cause. (orig.)

  15. Developing and applying a methodology for the scientific classification of publications on carbon capture and storage (CCS); Entwicklung und Anwendung einer Methodik zur wissenschaftlichen Einordnung von Publikationen zum Thema Carbon Capture and Storage (CCS)

    Energy Technology Data Exchange (ETDEWEB)

    Katz, Tobias; Sommer, Karl Christoph; Martens, Per Nicolai [RWTH Aachen (Germany). Inst. fuer Bergbaukunde I

    2012-05-15

    This article describes the conception and application of a methodology to scientifically classify publications on the Carbon Capture and Storage (CCS) topic. The first part of the presented methodology contains an analysis of both the fundamental positioning of the individual stakeholders writing about the CCS topic as well as their individual argumentative focus. For this purpose, all theses, which the individually analyzed stakeholders have included in their publications, are ascertained, classified, weighted, and evaluated. The second part of the methodology contains the linguistic evaluation (terminology) as well as the subsequent comparison of the individual stakeholders' linguistic and content related positions in a graphic depiction. The evaluations indicate that the theses associated with CCS technology in the reviewed publications primarily emphasize the economic and social aspects. The scope of the presented theses varies whereby only the publications of seven of the 28 reviewed stakeholders could be identified as being primarily ''holistically'' oriented. In addition, it can be seen that there is an above average number of stakeholders with a primarily negative position on the CCS topic in publications with a social argumentative focus. Another noticeable relationship exists between an economic argumentation and a positive position on the CCS topic. The linguistic analysis of the publications provides - as was to be expected - a clear correlation of the selected terminology and the argumentative focus. Stakeholders with a primarily negative argumentative focus tend to use therms with a negative connotation. The presented methodology can also be used in similar form in other controversially debated sectors. In principle, it is possible to also transfer this methodology to other topics outside the energy sector. It is, thus, possible to apply this method to any controversially debated topic for which a sufficiently large number of publications exists to help structurize the available literature and to identify the trends in the line of argumentation pursued by the various stakeholders. In addition, the results of the analyses of the diverse stakeholders can also be used as a comprehensive argumentative foundation for reviewing the respective topics as well as for critically examining one's own texts. (orig.)

  16. Alpine solar power station on Sareiserjoch - application of and sturdiness test on a new plastic mounting system; Alpines Solarkraftwerk Sareiserjoch - Anwendung und Haertetest fuer ein neues Kunststoff-Montagesystem

    Energy Technology Data Exchange (ETDEWEB)

    Krause, J. [NEWTEC, Plaston AG, Widnau (Switzerland)

    1997-12-31

    In Malbun in Liechtenstein a grid-connected 22 kW{sub p} PV system has been set up at an altitude of 1900 metres. This system serves its operator as a test of potovoltaics in general and of the mounting systems used in its load-bearing contruction and the fastening of its modules. The present article describes the load-bearing construction and plastic mounting cramp employed. (HW) [Deutsch] Im liechtensteinischen Malbun wurde auf 1900 Metern ueber Meer eine netzgekoppelte 11 kWp-PV-Anlage erstellt, die fuer den Anlagenbetreiber als Test fuer die Photovoltaik im allgemeinen wie auf fuer neue Montagesysteme sowohl bei der Tragkonstruktion als auch bei der Modulbefestigung dienen soll. Tragkonstruktion und Kunststoff-Montageklammer werden dargestellt. (HW)

  17. Two-criteria method for fracture-mechanical analysis of pipelines - practical application and influencing parameters; Zwei-Kriterien-Verfahren zur bruchmechanischen Befundbewertung in Rohrleitungen - praktische Anwendung und Einflussgroessen

    Energy Technology Data Exchange (ETDEWEB)

    Beukelmann, D. [TUeV Sued Industrie Service GmbH (Germany); Doerk, O.; Wernicke, R. [TUeV Nord SysTec GmbH und Co. KG (Germany)

    2006-07-01

    The findings obtained in recurrent inspections as a rule are evaluated by fracture-mechanical analyses. On the basis of the results, it is decided whether a component must be repaired or if operation can continue as it is for the time being. The two-criteria method is applied as a rule because of its universal applicability. Limited ductile crack growth can be taken into account if crack resistance curves are available that can be transferred to the component in question. In the investigations presented here, the influence of the relevant initial variables, e.g. strength coefficents, fracture-mechanical material coefficients, primary and secondary stresses and the intrinsic state of stress is illustrated by exemplary calculations. Further, the safety concepts underlying the assessment are gone into. (orig.)

  18. Development and application of methods and models for the calculation of spatially and temporally highly resolved emissions in Europe; Entwicklung und Anwendung von Methoden und Modellen zur Berechnung von raeumlich und zeitlich hochaufgeloesten Emissionen in Europa

    Energy Technology Data Exchange (ETDEWEB)

    Thiruchittampalam, Balendra

    2014-04-08

    High spatial and temporal resolution models are essential for answering many questions of air quality management and climate modeling. High-resolution emission models are required to determine the concentration of pollutants using chemical transport models, and to quantify the impacts on health and environment and in particular to develop adequate countermeasures. The aim of this work is to develop methods for the calculation of spatially and temporally high-resolved emissions and to apply these exemplarily on a 1 km x 1 km and hourly resolution for the year 2008 in the EU-27 and EFTA countries. The derivation of methods for the spatial and temporal resolution of emissions with corresponding detailed equations is one of the major improvements that have been carried out in the course of this work. The improvement of the spatial distribution of emissions from the point source relevant sectors like energy supply, industry and waste management is achieved by considering sector specific diffuse emission shares. The progress of the spatial distribution of emissions from households is in particular the development of a fuel type weighted distribution over Europe. Another main focus is the development of the spatial distribution of road transport emissions. Due to the restricted access to traffic count data at the European level, methods have been established to provide reliable emissions on grid level for Europe. The progress in the spatial distribution of agricultural emissions is achieved by the consideration of diffuse shares similar to the other point source relevant sectors like energy supply or industry. In addition to the spatial distribution of the emissions the temporal resolution is a main focus of this work, since the state of knowledge of the temporal resolution of emissions in Europe is still rudimentary. Therefore, it was necessary to develop in particular time curves for the hourly resolution of emissions for the main sectors, namely electricity and heat supply, households, commercial, trade and services, road transport and agriculture. One of the main focuses of the development of temporal profiles was specifically to consider temperature data and other parameters. The derivation of the time profiles requires huge amount of indicator data for each time step. Consequently, the goal for the development of temporal profiles in Europe is to derive temperature dependent equations which are capable of generating sector specific profiles for the present as well as for the future. Based on the developed methods, for the first time the visualization of hourly emissions on a 5 km x 5 km for Europe could be shown. The basis for the visualization was the calculation of hourly emissions at a 1 km x 1 km resolution. Due to the lack of quantitative uncertainty assessments, it was necessary to identify the reasons for the lack of uncertainty analysis at the European level and also to describe the possibilities of a quantitative uncertainty analysis for high resolution emission models. Moreover, on the basis of examples it was possible to describe, how the spatial and temporal uncertainty analysis of high resolution emission models can be carried out.

  19. Non-Markovian dynamics, decoherence and entanglement in dissipative quantum systems with applications to quantum information theory of continuous variable systems; Nicht-Markovsche Dynamik, Dekohaerenz und Verschraenkung in dissipativen Quantensystemen mit Anwendung in der Quanteninformationstheorie von Systemen kontinuierlicher Variablen

    Energy Technology Data Exchange (ETDEWEB)

    Hoerhammer, C.

    2007-11-26

    In this thesis, non-Markovian dynamics, decoherence and entanglement in dissipative quantum systems are studied. In particular, applications to quantum information theory of continuous variable systems are considered. The non-Markovian dynamics are described by the Hu-Paz-Zhang master equation of quantum Brownian motion. In this context the focus is on non-Markovian effects on decoherence and separability time scales of various single- mode and two-mode continuous variable states. It is verified that moderate non-Markovian influences slow down the decay of interference fringes and quantum correlations, while strong non-Markovian effects resulting from an out-of-resonance bath can even accelerate the loss of coherence, compared to predictions of Markovian approximations. Qualitatively different scenarios including exponential, Gaussian or algebraic decay of the decoherence function are analyzed. It is shown that partial recurrence of coherence can occur in case of non-Lindblad-type dynamics. The time evolution of quantum correlations of entangled two-mode continuous variable states is examined in single-reservoir and two-reservoir models, representing noisy correlated or uncorrelated non-Markovian quantum channels. For this purpose the model of quantum Brownian motion is extended. Various separability criteria for Gaussian and non-Gaussian continuous variable systems are applied. In both types of reservoir models moderate non-Markovian effects prolong the separability time scales. However, in these models the properties of the stationary state may differ. In the two-reservoir model the initial entanglement is completely lost and both modes are finally uncorrelated. In a common reservoir both modes interact indirectly via the coupling to the same bath variables. Therefore, new quantum correlations may emerge between the two modes. Below a critical bath temperature entanglement is preserved even in the steady state. A separability criterion is derived, which depends on the bath temperature and the response function of the open quantum system. Thus, the extended quantum Brownian motion model of a two-mode continuous variable system in a common reservoir provides an example of quantum noise-induced entanglement. (orig.)

  20. Application of extracellular gadolinium-based MRI contrast agents and the risk of nephrogenic systemic fibrosis; Anwendung von extrazellulaeren gadoliniumhaltigen MR-Kontrastmitteln und Risiko der Nephrogenen Systemischen Fibrose

    Energy Technology Data Exchange (ETDEWEB)

    Heverhagen, J.T. [Univ. Hospital Bern (Switzerland). Inst. of Diagnostic, Interventional and Pediatric Radiology, Inselspital; Krombach, G.A. [Justus Liebig Univ. Hopsital Giessen (Germany). Diagnostic and Interventional Radiology; Gizewski, E. [Medical Univ. Innsbruck (Austria). Dept. of Neuroradiology

    2014-07-15

    Nephrogenic systemic fibrosis (NSF) is a serious, sometimes fatal disease. Findings in recent years have shown that a causal association between gadolinium containing contrast media and NSF is most likely. Therefore, the regulatory authorities have issued guidelines on the use of gadolinium-containing contrast media which have reduced the number of new cases of NSF to almost zero. However, it is for precisely this reason that the greatest care must still be taken to ensure that these guidelines are complied with. The most important factors are renal function, the quantity of gadolinium administered and coexisting diseases such as inflammation. All of these factors crucially influence the quantity of gadolinium released from the chelat in the body. This free gadolinium is thought to be the trigger for NSF. Other important factors are the stability of the gadolinium complex and furthermore the route of its elimination from the body. Partial elimination via the liver might be an additional protective mechanism. In conclusion, despite the NSF risk, contrast-enhanced MRI is a safe diagnostic procedure which can be used reliably and safely even in patients with severe renal failure, and does not necessarily have to be replaced by other methods.

  1. Small specimen test results and application of advanced models for fracture mechanics assessment of RPV integrity; Ergebnisse von Kleinproben und Anwendung von Modellansaetzen zur bruchmechanischen Bewertung der RDB-Integritaet

    Energy Technology Data Exchange (ETDEWEB)

    Keim, Elisabeth; Huemmer, Matthias [AREVA NP GmbH (Germany); Hoffmann, Harald [VGB (Germany); Nagel, Gerhard [e-on Kernkraft (Germany); Kuester, Karin [VENE (Germany); Koenig, Guenter; Ilg, Ulf [EnBW (Germany); Widera, Martin [RWE (Germany); Rebsamen, Daniel [KKW Goesgen (Germany)

    2008-07-01

    For the RPV (reactor pressure vessel) integrity assessment the transferability of specimen test results to components is of main importance. The international project TIMES (transferability of fracture toughness of irradiated materials to components and structures) is focussed on the transferability of fracture mechanical characteristics of irradiated materials to components or structures, in order to allow the quantification of differences between sample and component characteristics based on experiments and calculations. The studies were performed for the brittle and brittle-ductile regions of the material characteristics using specimens from original RPV materials in different conditions. Based on case studies the consequence of a component assessment with postulated defects are shown when specimen-related materials properties are used. Since it is not possible to prove the transferability for an RPV in detail, component-similar effects were investigated that allow in combination with numerical modelling to quantify the safety margin. Samples and experimental procedures were developed that simulated the real component situation. The effects of crack depth and multiaxial loads, relevant for real components, were investigated with these samples. A micromechanical model was developed based on the weakest link theory and the statistical failure probability; this model is used for the prediction of fracture toughness of samples and components with defects. For a component with postulated defects the safety margin was assessed using different methodologies, based on standard fracture mechanical samples, taking into account component specific aspects. [German] Fuer die Bewertung der RDB-Integritaet ist die Uebertragbarkeit von Probenkennwerten auf Bauteile von grosser Bedeutung. Dazu wurde das Projekt ''TIMES'' - ein internationales Projekt zur Uebertragbarkeit von Bruchzaehigkeitskennwerten von bestrahlten Materialien auf Komponenten und Strukturen - durchgefuehrt, um anhand von Experimenten und Berechnungen Abstaende zwischen Proben- und Bauteilkennwerten zu quantifizieren und aufzuzeigen, welche Moeglichkeiten fuer die Uebertragbarkeit bestehen. Die Untersuchungen wurden fuer den sproed- und sproedduktilen Uebergangsbereich der Materialkennkurve durchgefuehrt. Sie beinhalten Versuche an original-RDB-Werkstoffen in verschiedenen Zustaenden. Anhand von Fallstudien wird gezeigt, welche Konsequenzen sich fuer eine Bauteilbewertung ergeben, wenn Materialkennwerte ermittelt an Proben fuer die Bewertung von Bauteilen mit postulierten Fehlern verwendet werden. In diesem Projekt wurde als Bauteil der Reaktordruckbehaelter betrachtet. Da es nicht moeglich ist, experimentell die volle Kette der Uebertragbarkeit Probe {yields} RDB nachzuweisen, wurden in TIMES (Transferability of fracture toughness of irradiated materials to components and structures) verschiedene bauteilaehnliche Effekte untersucht, die es erlauben, zusammen mit den numerischen Modellen Sicherheitsabstaende zu quantifizieren. So wurden Proben entwickelt und Experimente durchgefuehrt, die bauteilaehnliche Situationen simulieren, wobei in TIMES spezifisches Augenmerk auf die Verwendung von original bestrahlten RDBWerkstoffen gerichtet wurde. Anhand der Proben wurden Einfluesse wie Risstiefe und mehrachsige Belastung untersucht, die fuer Fehler in Bauteilen relevant sind. Ferner wurden neben diesen Experimenten numerische Verfahren weiterentwickelt, die es erlauben, die Bruchzaehigkeiten der Proben und auch der Bauteile mit Fehlern vorherzusagen. Dazu wurde ein mikromechanisches Modell, basierend auf der weakest link Theorie und der statistischen Versagenswahrscheinlichkeit generiert und fuer die Vorhersagen herangezogen. Fuer ein Bauteil mit postulierten Fehlern wurde mittels verschiedener Methoden der Sicherheitsabstand aufgezeigt, der sich aus der Verwendung von Standard-Bruchmechanikproben und der Beruecksichtigung von bauteilspezifischen Aspekten ergibt. (orig.)

  2. Zur Materialfrage in der Implantatchirurgie des Deszensus: Vergleich zwischen Polypropylenvlies und dermaler porciner azellulärer Kollagenmatrix unter Berücksichtigung der Erfahrungen nach 7 Jahren Anwendung von Implantaten

    Directory of Open Access Journals (Sweden)

    Fischer A

    2004-01-01

    Full Text Available Ziel der Studie: Die Studie beschreibt Verwendung, Effektivität und Nebenwirkungen zwei verschiedener Implantate, die in der Senkungschirurgie verwendet werden und stellen die Ergebnisse in einen Zusammenhang mit den Erfahrungen mit anderen Implantaten seitens der Autoren und in der Literatur. Material und Methode: 180 Patientinnen mit verschiedenen Formen von Genitalprolaps werden mit Biomesh(R behandelt, 185 Patientinnen mit Pelvicol(R in der Zeit von Juli 2000 bis Dezember 2002. Die Ergebnisse werden verglichen. Ergebnisse: Die Verwendung von Implantaten ist häufig erforderlich, vor allen Dingen in Fällen eines stark zerstörten Beckenbodensystems oder bei Rezidiven. Die Verwendung von Netz-Implantaten in der Senkungschirurgie ist sicher, solange eine vernünftige Implantatstruktur zugrunde liegt. Beide in dieser Studie untersuchten Implantate erfüllen dies zufriedenstellend. Rezidiv- und Senkungszustände der benachbarten Kompartimente müssen getrennt ausgewertet werden, um eine Verwechslung zwischen einem schlechten Therapieergebnis (obwohl es eigentlich gut ist und Strukturschwächen in den (noch nicht behandelten Kompartimenten nicht in einem Topf zu werfen. Die Notwendigkeit einer Explantation, das Ausbilden von Abszessen oder die Abstoßungsreaktion wurden nur gesehen, wenn multifilamente mikroporöse Bänder oder entsprechend strukturiertes Nahtmaterial zur gleichen Zeit eingesetzt worden sind, oder wenn Blutergußbildung nicht durch subtile Hämostase während des Eingriffs unterdrückt werden konnte. Schlußfolgerung: Beide Materialien (Biomesh(R und Pelvicol(R liefern in der Verwendung bei implantatunterstützter Deszensus-Chirurgie gute Ergebnisse, gleich, wo sie auch eingesetzt werden. Es gibt keine signifikanten Unterschiede in der Effektivität oder in der Nebenwirkungsrate. Es bedarf nun der größer angelegten multizentrischen Studien, um alloplastisch unterstützte rekonstruktive Beckenbodenchirurgie nicht nur in den französischsprachigen Ländern zu etablieren.

  3. Eine Extraktkombination aus Cranberry, Brunnenkresse und Meerrettich in der Anwendung bei Frauen mit unkompliziertem Harnwegsinfekt // A Complex Preparation of Cranberry, Horseradish and Watercress in the Treatment of Non-Severe Lower Urinary Tract Infect

    Directory of Open Access Journals (Sweden)

    Thiel I

    2016-01-01

    Full Text Available iIntroduction:/i Urinary tract infections (UTIs are among the most common bacterial infections affecting women. Due to the growing problem of antibiotic resistances there is an urgent need for alternative herbal medicinal products for the treatment of non-severe lower UTIs. Vaccinium macrocarpon is effective through various mechanisms of action without inducing resistances in microorganisms. Thus, an observational study (n = 48 was conducted with a preparation of a standardized cranberry extract (67 mg proanthocyanidines combined with glucosinolates containing extracts of Nasturtium officinale and Armoracia rusticana.br iMethods:/i Women (≥ 18 years with an increase in leukocytes in the urine and clinical symptoms typical for UTIs like dysuria, imperative strangury, augmented or new onset of incontinence and suprapubic pain received one of the tablets containing the combined herbal extracts twice daily during the first week and one tablet per day for the following 4 weeks. After 14 days (t1 and after 35 days (t2 taking the tablets a further survey and control check-up with a urine test have been conducted. Patients with persistent clinical symptoms received an antibiotic, for the others the intake of the tablets with the herbal combined extract preparation was continued.briResults:/i 34 patients (70,8 % could abstain from taking antibiotics within the first 14 days (t1 and 32 patients (66,7 % within 35 days (t2. 28 patients (87,5 % were without symptoms at t2. No adverse events were observed.briConclusion:/i This observational study was the first clinical study performed with a combined extract preparation containing Cranberry, Nasturtium and Armoracia, which furthermore supports the concept of using alternative medicine treating non-severe lower UTIs. p bKurzfassung: /biEinleitung:/i Harnwegsinfektionen (HWIs gehören zu den häufigsten bakteriellen Infektionen, die Frauen betreffen. Durch die wachsende Problematik der Antibiotika-Resistenzen besteht für die Behandlung von unkomplizierten unteren Harnwegsinfektionen (Urethritis, Zystitis, Urethrozystitis ein dringender Bedarf an alternativen pflanzlichen Arzneimitteln. Vaccinium macrocarpon, die amerikanische Cranberry, wirkt durch verschiedene Mechanismen, ohne Resistenzen auszulösen. Aus diesem Grund wurde eine Anwendungsbeobachtung (n = 48 mit einer Zubereitung eines standardisierten Cranberry-Extraktes (67 mg Proanthocyanidine, kombiniert mit senfölglykosidischen Extrakten aus Brunnenkresse (Nasturtium officinale und Meerrettich (Armoracia rusticana, durchgeführt.br iPatienten:/i Frauen (≥ 18 Jahre mit einem Leukozytenanstieg im Harn und klinischen Symptomen typisch für Harnwegsinfektionen wie Dysurie, Harndrang, neu auftretende Inkontinenz und Schmerzen über dem Schambein erhielten in der ersten Woche eine Tablette mit der Extraktkombination zweimal täglich und eine Tablette pro Tag für die folgenden 4 Wochen. Nach 14 Tagen (t1 und nach 35 Tagen (t2 wurde eine weitere Erhebung und Kontrolluntersuchung mit einem Urin-Test durchgeführt. Patientinnen mit anhaltenden klinischen Symptomen bekamen ein Antibiotikum verschrieben, bei den anderen wurde die Einnahme der Extrakte aus Cranberry, Brunnenkresse und Meerrettich fortgesetzt.briErgebnisse:/i 34 Patientinnen (70,8 % konnten innerhalb der ersten 14 Tage (t1 auf die Einnahme eines Antibiotikums verzichten und 32 Patientinnen (66,7 % benötigten auch nach 35 Tagen (t2 kein Antibiotikum. 28 Patientinnen (87,5 % waren zum Zeitpunkt (t2 ohne Symptome. Es wurden keine Nebenwirkungen beobachtet.briSchlussfolgerung:/i Diese Anwendungsbeobachtung ist die erste Studie mit einem entsprechenden Kombinationsextrakt (Cranberry, Brunnenkresse, Meerrettich, die darüber hinaus das Konzept des Einsatzes alternativer Therapeutika zur Behandlung von unkomplizierten unteren HWIs unterstützt.

  4. ASMUS - a numerical model for simulations of wind and pollutant dispersion around individual buildings. II. Dispersion modelling and applications; ASMUS - ein numerisches Modell zur Berechnung der Stroemung und der Schadstoffverteilung im Bereich einzelner Gebaeude. II. Schadstoffausbreitung und Anwendung

    Energy Technology Data Exchange (ETDEWEB)

    Gross, G. [Hannover Univ. (Germany). Inst. fuer Meteorologie und Klimatologie

    1997-06-01

    For pt.I see ibid., vol.3, p.267-74 (1994). The microscale model ASMUS-F was used to study air flow and dispersion in street canyons. The results demonstrate a strong dependence on car-induced turbulence, while the shape of roofs and trees along the street modify the situation only locally. The simulation results in the finding, that concentration in the canyon follows the relation c {proportional_to} u{sup -n} with n {approx} 0.35. Also the evaluation of statistical measures like the mean value are, compared to observations, very reasonable. (orig.)

  5. Fracture-mechanical analysis of metal/ceramic composites for applications in high-temperature fuel cells (SOFC); Bruchmechanische Untersuchung von Metall/Keramik-Verbunsystemen fuer die Anwendung in der Hochtemperaturbrennstoffzelle (SOFC)

    Energy Technology Data Exchange (ETDEWEB)

    Kuhn, Bernd Josef

    2008-08-25

    The author investigated the deformation and damage behaviour of soldered ceramic/metal joints in SOFC stacks, using thermochemical methods. Methods for analyzing sandwich systems and for mechanical characterization of joints were adapted and modified in order to provide fundamental understanding of the mechanical properties of soldered joints. [German] In dieser Arbeit wurde das Verformungs- und Schaedigungsverhalten von Keramik/ Metall-Loetverbindungen fuer SOFC-Stacks thermomechanisch untersucht. Verfahren zur Analyse von Schichtsystemen und fuer die mechanische Charakterisierung von Fuegeverbindungen wurden adaptiert und weiterentwickelt, um zu einem grundlegenden Verstaendnis der mechanischen Eigenschaften von Loetverbindungen zu gelangen.

  6. New findings on the application of in-lake technologies for neutralisation of acid mining lakes; Neue Erkenntnisse zur Anwendung von In-Lake-Verfahren fuer die Neutralisation saurer Bergbaufolgeseen

    Energy Technology Data Exchange (ETDEWEB)

    Rabe, W. [eta AG engineering, Spremberg (Germany); Uhlmann, W. [Institut fuer Wasser und Boden Dr. Uhlmann, Dresden (Germany)

    2006-07-01

    The neutralisation of acidic open cast mining lakes is an important task at the restoration of post lignit mining landscapes in Lusatia and Middle Germany. From several treatment technologies for the manipulation of ground and surface waters the in-lake-treatment procedures are most cost effective, licensable and usable with passable risks to reach ecological targets. The proceedings and the results of a two-stage-treatment technology of the Horstteich near Luckau will be exemplified in this article. In this case it was possible, within 20 days, to improve the water quality from extreme acidic (pH {approx} 2.8) to neutral conditions (pH > 8). During the neutralisation nearly all heavy metals and suspended substances were precipitated and a noticeable buffer was built up against acidic inflows. (orig.)

  7. Source oriented modeling of the nitrat pollution of surface waters - application of the immission method for the reporting according to the EC nitrat guideline; Verursacherbezogene Modellierung der Nitratbelastung der Oberflaechengewaesser - Anwendung des Immissionsverfahrens zur Berichterstattung zur EU-Nitratrichtlinie

    Energy Technology Data Exchange (ETDEWEB)

    Behrendt, H.; Opitz, D. [Institut fuer Gewaesseroekologie und Binnenfischerei im Forschungsverbund Berlin e.V. (Germany); Bach, M. [Gesellschaft fuer Boden- und Gewaesserschutz e.V. (Germany); Pagenkopf, W.G. [Geodaten Integration und Analyse, Berlin (Germany)

    2000-09-20

    The observation of 152 monitoring stations of the German countries does not exceed the 50 mg/l target for nitrate. But a good water quality in relation to nitrate can be observed at only 14% of these monitoring stations. If variations in the nitrate concentrations caused by variation of runoff are neglected unique trends of the nitrate pollution from agriculture can not be detected since the mid of 80's. More detailed analysis were carried out for 15 EU monitoring stations. The average winter concentration of nitrate is for the half of these stations constant and a low reduction can be observed for the other half. A similar result shows the average winter concentrations at low flow conditions. The separation of the nitrogen sources into diffuse and point sources using the immission approach shows for both a small decrease for the period 1996-1999 in comparison with the previous period. In contrast to the situation in the mid of 80's the discharges from point sources are decreased and contribute to the total load only in a range of 9-24% in the different river basins. The immission method shows similar results as the emission model. In the mid of the nineties about 67% of the N-inputs into the surface waters of Germany are caused by agricultural activities. The dominant pathway was groundwater with about 48%. The total emissions were reduced by 24% mainly caused by point source reduction. The nitrogen surplus (area related balance) in the agricultural soils were estimated for Germany and for the German countries to show the causes of the nitrogen problem in agriculture. Since 1990 the N-surpluses are reduced and are at present in a range between 70 and 80 kg/ha agricultural area. For the new German countries the N-surplus showed a dramatic decrease in 1990/91 followed by a continuous increase. Contrary the N-surplus in the old German countries is characterised by a slow decrease over the whole time period since 1990. The influence of the order for the application of fertilizer seems to be very low. The comparison of long term changes of nitrogen surplus and nitrate concentration within the river basins allows a raw estimation of the residence times of nitrogen from the topsoil to the river. These times were estimated in a range between about 5 years (Rhine) and more than 20 years (Elbe). (orig.) [German] Die Ueberwachung der Oberflaechengewaesser an den 152 Messstellen der Bundeslaender (LAWA-Messstellennetz) ergab im Berichtszeitraum keine Ueberschreitung des Qualitaetsziels fuer Nitrat von 50 mg/l. Aber bei nur 14% der Messstellen wird eine gute Wasserqualitaet bezueglich Nitrat erreicht. Sieht man von abflussbedingten Schwankungen ab, sind eindeutige Trends der Nitratbelastung aus der Landwirtschaft seit der Mitte der 80er Jahre nicht erkennbar. Vertiefende Analysen wurden fuer die 15 EU-Messstellen Deutschlands durchgefuehrt. Fuer den Trend der mittleren Winterkonzentrationen zeigt sich an jeweils der Haelfte dieser Messstellen Stabilitaet bzw. eine schwache Reduktion. Ein aehnliches Ergebnis ergaben die Winterkonzentrationen bei geringen Abfluessen. Die Separation von diffusen und punktuellen Stickstoffquellen auf Basis des Immissionsverfahrens ergab im Berichtszeitraum 1996-1999 bei beiden Anteilen eine leichte Verminderung gegenueber dem vorangegangenen Vierjahres-Zeitraum. Gegenueber der Mitte der 80er Jahre haben die Punktquellen dagegen z.T. erheblich abgenommen und machen heute nur noch 9-24% in den verschiedenen Flussgebieten aus. Das Immissionverfahren zeigt die gleichen Ergebnisse wie die Emissionsschaetzungen. Mitte der 90er Jahre stammten danach ungefaehr 67% der Stickstoffbelastungen der Oberflaechengewaesser aus landwirtschaftlichen Flaechen. Der Weg ueber das Grundwasser war mit 48% der bedeutendste. Die Gesamtemissionen haben vor allem durch Verringerung der Punktquellen um etwa 24% abgenommen. Zur Darstellung der Urachen in der Landwirtschaft wurden die Stickstoffueberschuesse (Flaechenbilanz) Deutschlands und deren regionale Verteilung in den Bundeslaendern ermittelt. Seit 1990 haben die Ueberschuesse etwas abgenommen und liegen heute zwischen 75 und 80 kg/ha LF. Dabei folgte in den neuen Bundeslaendern einem starker Einbruch 1990/91 ein kontinuierlicher Anstieg, waehrend in den alten Laendern die Bilanzueberschuesse langsam sanken. Die Wirkung der Duenge-Verordnung ist nur sehr gering. Vergleiche zwischen der Entwicklung der Stickstoffueberschuesse und der Nitratkonzentrationen machen erste Schaetzungen ueber die Reaktionszeiten der Flussgebiete auf Aenderungen in der Landwirtschaft moeglich. Diese Zeiten liegen in einem Bereich von etwa 5 Jahren (Rhein) bis zu mehr als 20 Jahren (Elbe). (orig.)

  8. Fabrication and examination of epitaxial HTSC/isolator thin films on sapphire substrates for application in high frequency devices; Herstellung und Untersuchung von epitaktischen HTSL/Isolator-Schichten auf Saphirsubstraten zur Anwendung in HF-Bauelementen

    Energy Technology Data Exchange (ETDEWEB)

    Kittel, H.

    1995-10-01

    The use of high temperature superconductors (HTSC) like YBCO with distinct lower surface resistance compared to normal conductors allows miniaturisation of high frequency (HF) circuits. The object of this work was the fabrication of YBCO thin films on low loss sapphire substrates applicable for stripline devices. To induce epitaxial growth and to avoid chemical reaction at the film-substrate boundary buffer layers were investigated. The examination of the growth properties and especially of the surface impedance has been allotted particular importance. In contrast to CaTiO{sub 3} it was possible to deposit CeO{sub 2}-buffer layers in direct growth up to a thickness of about 30 nm without cracks. The films show all growth properties required and even Laue-oscillations being a feature of high quality growth enabling the determination of film thickness distribution without destruction. The YBCO growth-, transport- and HF-properties meet the ones of YBCO films on standard substrates. A remarkable result is that the mosaic distribution of the CEO film, itself strongly dependend on film thickness, does not influence that of the YBCO film considerably. Rather it changes its shape subsequently due to YBCO deposition. A further particularity in contrast to deposition on standard substrates is the need to adjust the substrate heater tempeature for deposition of YBCO films with thicknesses {>=}300 nm needed for HF application. To demonstrate their usefullness some stripline devices like planar coils and side coupled filters have been fabricated and characterised. (orig.)

  9. Librarian - phase 2. Subproject: the application of reflectometric interference spectroscopy (RIfS) in biological systems. Final report; Librarian - Phase 2. Teilprojekt: Anwendung des Verfahrens der Reflektometrischen Schichtdickenmessung zur Signaldetektion in biologischen Testsystemen und Festphasensynthesen. Schlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Birk, G.; Hadamovsky, S.

    2000-07-01

    Label free methods that do not require fluorescence markers or radioactive isotopes are of interest for high throughput screening applications. Thus, a new assay type for the RIfS technology was developed. These phosphorylation assay experiments were tested for reproducibility and were validated, initially using a single channel machine. The use of surface active materials to reduce or eliminate non specific binding is recommended. The non specific binding of the individual reagents was an important factor for their integration in the RIfS method. The immobilisation of binding reagents was tested using various methods. Since the various combinations are essentially limitless, they could not be explored to their full extent within the confines of this project. The application of the assay into microtitre plate format was not fully completed within the time frame allotted, however, has since been completed by one of the project participants as part of a further cooperation. Theoretically, this method is also suited to the robotics and sample throughput integral to a HTS system A comprehensive evaluation of RIfS technology regarding its entry into high throughput screening, however can only be made with reservation, due to the limited experience with its use in 96 and 384 microtitre plates. (orig.)

  10. Development and prototypical application of analysis methods for complex anion mixtures in waters and heavy metal organyls in sediments; Entwicklung und prototypische Anwendung von Analysenverfahren fuer komplexe Anionengemische in Waessern und Schwermetallorganylen in Sedimenten. Schlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Anders, B.; Knoechel, A.; Potgeter, H.; Staub, S.; Stocker, M.

    2002-07-01

    When it comes to assessing the hazards emanating from heavy pollutants in waters mere elemental analysis provides too little information. Due to the great differences in toxicity and mobility it is important to know more about the exact species in question. This is particularly true of heavy metals that form stable organyls, specifically As, Pb, Sn and Hg, but also of alkylated arsenic acids, which need to be measured in complex anion mixtures. The purpose of the present project was to develop robust, powerful analysis methods and thus overcome the existing deficit in reliable analysis methods for these substances. An important approach in this connection is the use of coupled chromatography and detection systems for separation and analysis. [German] Hinsichtlich der von einer Schwermetallbelastung in Gewaessern ausgehenden Gefahren liefert die reine Elementanalytik nur unzureichende Aussagen. Aufgrund der grossen Unterschiede in Toxiditaet und Mobilitaet ist die Kenntnis der jeweils vorliegenden Spezies bedeutungsvoll. Dies gilt in besonderem Masse fuer die stabile Organyle bildenden Schwermetalle As, Pb, Sn und Hg sowie die alkylierten Arsensaeuren, die es innerhalb komplexer Anionengemische zu bestimmen gilt. Hinsichtlich ihrer sicheren Bestimmung bestehen methodische Defizite, die das vorliegende Projekt durch die Entwicklung robuster, nachweisstarker Analysenverfahren zu beseitigen versucht. Grosse Bedeutung kommt dabei gekoppelten Systemen aus Chromatographie und Detektion als Trenn- und Bestimmungsmethode zu. (orig.)

  11. Investigations of the oxidation-induced service life of chromium steels for high temperature fuel cell application (SOFC); Untersuchungen zur oxidationsbedingten Lebensdauer von Chromstaehlen fuer die Anwendung in der Hochtemperaturbrennstoffzelle (SOFC)

    Energy Technology Data Exchange (ETDEWEB)

    Ertl, S.T.

    2006-08-17

    The increasing energy consumption of future automobiles should be covered by a solid oxide fuel cell (SOFC) used as an additional energy supply (auxiliary power unit). The application of a SOFC with about 5 kW power in cars requires small size, low weight and an economic fabrication. To achieve this goal the interconnector and the metallic anode substrate (depending on an alternative concept of construction) should be manufactured out of thin Crofer22APU, a high chromium ferritic steel. The scale formation mechanisms on Crofer22APU sheets, wires and powder metallurgical produced foils of different thicknesses were investigated in several atmospheres of water vapour/hydrogen at 800 and 900 C, simulating the anode conditions. For scale characterization a number of conventional analysis techniques such as optical metallography, scanning electron microscopy and X-ray diffraction were used in combination with deflection testing in monofacial oxidation and two-stage oxidation studies using {sup 18}O and H{sub 2} {sup 18}O tracer. With these results a theoretical model for the determination of lifetime was developed for Crofer22APU components in simulated anode gas. It was found that the lifetime at a given temperature depends not only on the surface-to-volume ratio, but also on the geometry of the component (e.g. sheet or wire). The critical Cr content required for breakaway oxidation depends on microcrack formation in the surface oxide scale, which occurs on ridges of a sheet during thermal cycling. The development of a metallic interconnector and a metallic anode substrate requires measures to avoid interdiffusion between the alloy and the bordering nickel-YSZ (yttrium stabilized zirconia) cermet of the anode, or depending on the conception of the stack, the bordering nickel-YSZ cermet of the anode functional layer. Therefore the suitability of preoxidation layers after different preoxidation conditions was tested. It was found that the inhibition of the interdiffusion depends not only on the preoxidation conditions, but also on the conditions under which the nickel layer was applied. (orig.)

  12. 2013 annual meeting of the Deutsche Gesellschaft fuer Zerstoerungsfreie Pruefung (DGZfP). NDE in research, development and application; DGZfP-Jahrestagung 2013. Zerstoerungsfreie Materialpruefung. ZfP in Forschung, Entwicklung und Anwendung

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2013-07-01

    This CD-ROM proceedings publication contains the papers and posters of the DGZfP annual meeting 2013, at Bremen, Germany, both in full text and as PowerPoint presentations. The following issues were discussed: computerized tomography, thermography; radiographic, ultrasonic, eddy current and microwave testing. 13 papers were recorded as separate entries in the INIS database.

  13. Measurements of vertical displacement of power station buildings using an automatic stationary hydrostatic measuring system; Anwendung des automatisierten stationaeren hydrostatischen Messsystems fuer die Aufnahme der Vertikalverschiebungen an den Objekten der Kern- und Waermekraftwerke

    Energy Technology Data Exchange (ETDEWEB)

    Lechner, J [Forschungsinstitut fuer Geodaesie, Topographie und Kartographie, Zdiby (Czechoslovakia)

    1997-12-31

    The contribution describes hydrostatic stationary measuring systems for measurements of height variations of a turbine unit. The measuring system developed at the research institute and the algorithms for calibration, measurement and evaluation are presented. Measurements were made on a 500 MW turbogenerator unit at different states of operation. (orig.) [Deutsch] Der Beitrag enthaelt eine kurze Uebersicht ueber die hydrostatischen stationaeren Messsysteme fuer das Gebiet der Messung der Hoehenaenderung eines Grossturbinentisches. Es wird das automatische stationaere hydrostatische Messsystem, das im Forschungsinstitut entwickelt wurde, der Algorithmus der Kalibrierung, der Messung und der Auswertung der Messergebnisse vorgestellt. Es wird das Messergebnis der Vertikalverschiebungen der Konstruktion des Turbogenerators mit der Leistung 500 Megawatt bei seinem verschiedenen Betriebszustand angefuehrt. (orig.)

  14. Bestimmung des Bodenreibungsbeiwertes und der Oberflächenreibung eisbedeckter Wasserflächen im Meiningenstrom der Darß-Zingster Boddenkette und Anwendung auf vertikal integrierte hydronumerische Modelle

    OpenAIRE

    Schönfeldt, Hans-Jürgen; Raabe, Armin; Baudler, Henning

    2016-01-01

    In einem hydronumerischen Modell zur Prognose des Strömungs- und Wasserstandsfeldes flacher Gewässer wird eine auf der Turbulenztheorie basierende Tiefenkorrektur für den Bodenreibungsbeiwertwert eingeführt und auf der Basis von Berechnungen für die DarßZingster Boddenkette überprüft. Für einen ausgewählten Meßpunkt der Darß-Zingster Boddenkette wurde der Reibungsbeiwert sowohl am Boden als auch unter einer Eisschicht experimentell bestimmt. Die Auswirkungen einer Tiefenkorrektur des Reibungs...

  15. Paul Ricœurs Suche nach einer Neubegründung der Menschenrechte und der Würde durch die Fähigkeiten und die Anwendung der phronèsis

    Directory of Open Access Journals (Sweden)

    Yvanka B. Raynova

    2016-12-01

    The aim of the following article is to reconstruct Paul Ricoeur's concepts of human rights and human dignity by exploring some little-known texts, and to exemplify how these concepts are connected to a specific philosophical conception of human being, which is grounded in a Dialectics between transcendence and incarnation, freedom and dependence, identity and difference, capability and fallibility (fragility. In doing so, I will argue that Ricœur interprets human dignity, which he has never explicitly defined, through the prism of human capabilities, especially of the capability of being responsible. This interpretation allows him to take a differentiated position in the current bioethical debates on the rights of "potential persons" (Embrio and to illustrate how the Aristotelian phronèsis can be used in (bioethical cases where decisions are difficult to take.

  16. Quality-oriented production of brown-coal coke with due regard to its application in metallurgy and environmental protection; Qualitaetsgerechte Erzeugung von Braunkohlenkoks unter Beruecksichtigung der Anwendung in Metallurgie und Umweltschutz

    Energy Technology Data Exchange (ETDEWEB)

    Achtelik, M.; Erken, M.; Juessen, P.; Knapp, A. [Rheinbraun AG, Koeln (Germany)

    1998-12-31

    In the nineteen seventies the Fortuna Nord refining factory of Rheinbraun AG began to restructure its operations from domestic coal briquetting to the manufacture of industrial products. One of these products, high-temperature brown-coal coke, is produced in two hearth-type furnaces. Coke produced in these plants is mainly used in metallurgy and environmental engineering, in the latter especially for flue gas purification. Rheinbraun has succeeded in introducing a quality management system for brown-coal coke which ensures high quality and security of supply. (orig.) [Deutsch] Im Veredlungsbetrieb Fabrik Fortuna-Nord der Rheinbraun AG begann in den 70er Jahren der Strukturwandel vom Hausbrandbrikett zu Industrieprodukten. Eins dieser Produkte, der Hochtemperatur-Braunkohlenkoks, wird in zwei Herdofenanlagen erzeugt. Die Haupteinsatzbereiche des Herdofenkokses sind die Metallurgie sowie der Umweltschutz und hier insbesondere die Rauchgasreinigung. Um die hohe Produktqualitaet und die Liefersicherheit zu gewaehrleisten, hat Rheinbraun ein Qualitaetsmanagementsystem fuer Braunkohlenkoks erfolgreich eingefuehrt. (orig.)

  17. High-k materials in the electrolyte/insulator/silicon configuration. Characterization and application in bio-electronics; Hoch-k-Materialien in der Elektrolyt/Isolator/Silizium-Konfiguration. Charakterisierung und Anwendung in der Bioelektronik

    Energy Technology Data Exchange (ETDEWEB)

    Wallrapp, F

    2006-12-19

    In order to elicit action potentials in nerve cells adhered on electrodes, a certain current is required across the electrode. Electrochemical reactions may cause damage to cells and electrodes. This is evaded by using silicon electrodes which are insulated by a dielectric. In doing so, only capacitive current is flowing, and electrochemical are avoided. The aim of this work was to fabricate novel stimulation chips exhibiting an enhanced capacitance which render new biological applications possible. These chips were to be characterized and used for the stimulation of cells. The formerly used dielectric SiO{sub 2} was replaced by HfO{sub 2} and TiO{sub 2}, with both of them featuring a higher dielectric constant. They were deposited on the silicon substrate by ALD (atomic layer deposition). The chips were characterized in the electrolyte/insulator/semiconductor (EIS) configuration. Owing to the low leakage current of the EIS configuration, the characterization of the high-k materials was possible in more detail as compared to using a metallic top contact (MIS configuration). The voltage-dependent capacitances of the HfO{sub 2} films could be interpreted by means of a common metal/SiO{sub 2}/silicon system. In contrast, the TiO{sub 2} films exhibited interesting properties which could only be rationalized with the help of numerical calculations assuming free electrons in the TiO{sub 2}. The low-lying conduction band of TiO{sub 2} caused accumulation of electrons within the TiO{sub 2} for certain voltages, which led to an enhanced capacitance. The effects of high voltages, frequency, film thickness and interlayer composition were examined and brought into compliance with the model. The novel TiO{sub 2} stimulation devices featured a five-fold capacitance increase as compared to former SiO{sub 2} chips. Using them, two fundamental stimulation mechanisms were induced in HEK293 cells expressing the recombinant potassium channel Kv1.3: Opening of ion channels and electroporation of the cell membrane. Depending on the stimulus shape, one of these mechanisms or both of them simultaneously could be induced. Because only capacitive current was flowing during stimulation, electrochemical reactions damaging the cell were avoided. The new devices were used successfully also in various other projects, in which they rendered new biological applications possible. (orig.)

  18. Practical application of the microbial activity analysis on the monitoring of the process biological stability of biogas plants; Praktische Anwendung der mikrobiellen Aktivitaetsanalyse zur Ueberwachung der prozessbiologischen Stabilitaet von Biogasanlagen

    Energy Technology Data Exchange (ETDEWEB)

    Neumann, Lukas; Tietjen, Carsten [MT-Energie GmbH, Zeven (Germany). Forschung und Entwicklung; Rilling, Norbert [MT-Energie GmbH und Co. KG, Rockstedt (Germany)

    2013-10-01

    As extension for the classical fluorescence microscopic analysis of the microbial population in a biogas fermenter the cell counts and frequency of the different methanogenic organisms was used to generate the plant specific stability indicator called MT-Factor. This factor describes the optimal composition of the microbial population for the current process conditions and could be used for the biological process consulting. A study of the MT-Energie laboratory showed that the combination of the microbial cell counts determination and the plant specific stability factor shifts during a process instability or failure of a biogas fermenter. This analysis of the methane-forming microorganisms as well as their cell count and importance for the entire anaerobic biology of the biogas plant can be used for clearly visualizing and tracking the vitality of the digestion process. The evaluation of the microbial activity of different liquid manure samples could show the influence of inhibitors like disinfectant or cleaning agents directly without time consuming cultivation tests. By determining the MT-Factor and analyzing the activity of the methane formers, an impending influence of inhibitors can be detected in liquid manure before the manure enters the digester. This way, a negative influence on the gas yield can be avoided. (orig.)

  19. The use of a cine-technique in the MRT investigation of the temporo-mandibular joint. Die Anwendung der 'Cine-Technik' in der MRT-Diagnostik des Kiefergelenkes

    Energy Technology Data Exchange (ETDEWEB)

    Vogl, T.J.; Assal, J. (Univ. Muenchen, Radiologische Klinik Innenstadt (Germany)); Eberhard, D.; Weigl, P.; Randzio, J. (Univ. Muenchen, Klinik und Poliklinik fuer Kieferchirurgie (Germany))

    1992-03-01

    A new cine-technique in a prospective study using rapid gradient echo sequences was evaluated for the MRT investigation of the temporo-mandibular joint. A newly developed hydraulic apparatus was used to produce progressive opening of the jaw and MRT appearances were recorded during predetermined points of mandibular movement. The investigation included 16 normals and 34 patients. A modified gradient echo sequence was combined with an optimised surface coil or a special double coil and this provided good spatial resolution of the articular disc and of the muscular and bony structure. Amongst the abnormal findings were luxation of the disc (15 cases), tears in the disc (5 cases), late effects of internal derangements (12 cases) and condylar hypermobility (7 cases). The new cine-technique provides specific images in any chosen position of the mandible depending on the clinical disability of the patient. (orig.).

  20. Water quality and management - the use of models for the estimation of the hazard potential for groundwater by organic pollutants in solid waste; Gewaesserguete und Wasserwirtschaft - Anwendung von Modellen zur Abschaetzung der Grundwassergefaehrdung durch organische Stoffe aus Reststoffen

    Energy Technology Data Exchange (ETDEWEB)

    Klein, M.

    2000-08-31

    In this study the deterministic leaching model PELMO was extended in order to consider two additional transport processes (fast transport via the macro porous flow system without equilibrium conditions with respect to sorption, and transport of pollutants in the soil water bound to humic substances). The extended model was implemented into the stochastic estimation model MCPELMO 2.0. The new development has built in 22 leaching scenarios based on a combination of the German soil regions map (12 soil regions) and 9 representative weather stations. As daily temperature and precipitation data over a period of 30 years were available the influence of climatic fluctuations on the percaloate concentrations could be considered. In parallel to the model development nomograms were calculated based on the algorithms of MCPELMO 2.0 making it possible to estimate concentrations in leachate also graphically. The results of the MCPELMO 2.0 simulations were compared with comprehensive simulations over a period of 1000 years performed with the computer model PELMO. The analysis showed that the screening model MCPELMO 2.0 that was orders of magnitude faster than PELMO was nevertheless able to estimate concentrations close to PELMO for most of the substances. It was additionally concluded that the results of the estimation model behave conservative compared to the comprehensive simulations: MCPELMO is often slightly overestimating pollutant concentrations in the percolate. Only for pollutants having KOC values above 5000 L/kg and DT50 numbers above 2000 days MCPELMO was estimating lower concentrations in the percolate than PELMO. (orig.) [German] In diesem Vorhaben wurde das deterministische Versickerungsmodell PELMO um zwei zusaetzliche Transportprozesse erweitert (schneller Stofftransport ueber das Makroporensystem ohne Einstellung von Sorptionsgleichgewichten, sowie Transport von Stoffen im Bodenwasser gebunden an Huminsaeuren) und das erweiterte Modell in das stochastische Abschaetzmodell MCPELMO 2.0 eingebaut. Im neuentwickelten MCPELMO 2.0 sind insgesamt 22 Versickerungsszenarien definiert, die auf einer Kombination der Bodenregionenkarte der Bundesrepublik Deutschland (12 Bodenregionen) mit 9 repraesentativen Klimastationen basieren, von denen taegliche Temperatur- und Niederschlagsdaten ueber einen Zeitraum von 30 Jahren vorlagen. Parallel zu der Modellentwicklung wurden Nomogramme auf der Basis der Algorithmen von MCPELMO 2.0 erstellt, mit denen die Sickerwasserkonzentrationen ebenfalls grafisch abgeschaetzt werden konnten. Die Ergebnisse des Simulationsprogramms MCPELMO 2.0 wurden mit ausfuehrlichen Simulationen ueber jeweils 1000 Jahre mit dem Computerprogramm PELMO verglichen. Die Analyse zeigte, dass das (im Vergleich mit PELMO) um Groessenordnungen schnellere Screeningmodell MCPELMO 2.0 in der Lage war, sinnvolle Konzentrationen im Sickerwasser fuer die meisten Substanzen abzuschaetzen. Darueber hinaus kann davon ausgegangen werden, dass die Abschaetzung im Vergleich mit einer ausfuehrlichen Simulation konservativ ist, das heisst das MCPELMO 2.0 die Konzentrationen tendenziell ueber- und nicht unterschaetzt. Geringere Konzentrationen als bei den ausfuehrlichen PELMO-Simulationen traten nur bei Substanzen mit KOC-Werten oberhalb von 5000 L/kg bzw. Halbwertszeiten oberhalb von 2000 Tagen auf. (orig.)

  1. New certification process starts. Pt. 2. Application of Building Information Modeling (BIM) for the certification according to DGNB; Zertifizierungsprozess auf ''neuen Beinen''. T. 2. Anwendung von Building Informationen (BIM) zur Zertifizierung nach DGNB

    Energy Technology Data Exchange (ETDEWEB)

    Essig, Bernd [SCHOLZE Consulting GmbH, Leinfelden-Echterdingen (Germany). Geschaeftsbereich Ingenieur-Beratungsleistungen in Facility-, Informations-, Qualitaets-, Nachhaltigkeitsmanagement und Energieberatung; Ernst, Tatjana [SCHOLZE Consulting GmbH, Leinfelden-Echterdingen (Germany)

    2013-04-01

    The overall life cycle plays a significant role in the certification by German Sustainable Building Council (Stuttgart, Federal Republic of Germany). In order that certification becomes much more than only a documentation, comprehensive data are requested already in an early phase of planning. Early investigations of alternatives may have a significant influence on the life cycle of a building. But, from where do the auditors achieve these amounts of data without overcharging the partners involved in the planning process with questions. The Building Information Modelling contributes to the development of the future enhancement of process quality by an innovative information management.

  2. Molekularbiologische Analyse der genetischen Diversität des \\(\\textit {Melitaea athalia}\\) / \\(\\it celadussa\\)-Komplexes (Lepidoptera: Nymphalidae) unter Anwendung der ISSR-PCR auf Art-, Unterart- und Populationsebene

    OpenAIRE

    Achtelik, Gerdo

    2007-01-01

    Mit Hilfe der ISSR-PCR wurde erstmalig eine großräumige Populationsanalyse bei einer Tagfalterart am Beispiel von \\(\\it {Melitaea athalia}\\) vorgenommen. Es konnten fünf verwandte Arten der Nymphalidae - \\(\\it {Melitaea diamina}\\), \\(\\textit {M. cinxia}\\) und \\(\\textit {M. aurelia}\\) sowie \\(\\it {Boloria euphrosyne}\\) und \\(\\textit {Issoria lathonia}\\) - untereinander sowie gegenüber \\(\\textit {M. athalia}\\) differenziert werden. 90 Primer wurden geprüft, 8 Primer amplifizierten allein für \\(...

  3. Development and application of a parallel finite volume method for flow simulation on unstructured grids with local refinement; Entwicklung und Anwendung eines parallelen Finite-Volumen-Verfahrens zur Stroemungssimulation auf unstrukturierten Gittern mit lokaler Verfeinerung

    Energy Technology Data Exchange (ETDEWEB)

    Seidl, V.

    1997-11-01

    A finite vomume method for calculation of steady and unsteady flow on unstructured grids is parallelized by local spatial and time decomposition. In the first case, a parallel variant of the conjugated gradient method with multiple local preconditioning is formulated and analyzed. The method is tested for simple applications (e.g. flow around a cylinder). The second part of the publication describes a direct numerical simulation of turbulent flow around a sphere at a Reynolds number of 5000 (based on flow velocity and sphere diameter). Current and Reynolds-averaged flow fields are discussed. Particular emphasis is placed on coordinate-independent representation of the anisotropy ratios of the Reynolds tensor and dissipation tensor. (orig.) [Deutsch] Ein Finite-Volumen-Verfahren fuer die Berechnung stationaerer und instationaerer Stroemungen auf unstrukturierten Netzen wird durch Gebietszerlegung im Raum und Zeit parallelisiert. Fuer die raeumliche Zerlegung wird eine parallele Variante der konjugierten Gradienten Methode mit mehrfacher, lokaler Vorkonditionierung formuliert und analysiert. Anhand einfacher Anwendungsbeispiele (Zylinderumstroemung, deckelgetriebene Nischenstroemung) wird das entwickelte Gesamtverfahren getestet und seine Effizienz bestimmt. Der zweite Teil der Arbeit beschreibt eine direkte numerische Simulation der turbulenten Kugelumstroemung bei einer Reynolds-Zahl von 5 000 (basierend auf Anstroemgeschwindigkeit und Kugeldurchmesser). In der Ergebnisauswertung werden augenblickliche und Reynolds-gemittelte Stroemungsfelder diskutiert und besonderer Wert auf eine koordinatenunabhaengige Darstellung der Anisotropieverhaeltnisse des Reynolds-Tensors und des Dissipationstensors gelegt. (orig.)

  4. Bipolar plates for polymer electrolyte membrane fuel cells made of thermal and electrical high conductivity thermoplastics. Formulation, production, characterization and application; Bipolarplatten fuer Polymerelektrolytmembran-Brennstoffzellen aus thermisch und elektrisch hochleitfaehigen thermoplastischen Kunststoffen. Rezeptierung, Herstellung, Charakterisierung und Anwendung

    Energy Technology Data Exchange (ETDEWEB)

    Kaiser, Ralf Leonhard

    2008-07-01

    The upcoming lack of primary energy sources and the need of reducing the anthropogenic climate change led to increased research activities in the field of Fuel Cells (FC) technology within the last ten years in Europe, the USA and Japan. Especially the automotive industry is highly interested in developing zero emission cars as a replacement of nowadays cars within the next twenty years. Not only for mobile applications the Polymer Electrolyte Membrane Fuel Cell systems (PEM-FC systems) is the focus of research and development. Also stationary (PEM-) FC applications seem to be more and more interesting for a decentralized energy supply, producing electricity and heat (Vaillant FC-Systems, Bosch/Junkers). For this purpose, system miniaturizing and weight reduction (70-90 wt-% of the stack itself is due to bipolar- and endplate) is not that essential as it is for mobile appliance, resulting in earlier commercial market introduction of these systems within the next few years. Not only the weight reduction of the FC-stack itself, but also the cost cutting of its components is vital for the economic success of this technology. The three most expensive components of the stack are the perfluorsulfonated ion conducting Membranen (PEM: Nafion, Ashai, Ashai glass), the noble metal catalyst (Platinum and/or Ruthenium) and the Bipolar Plate (BPP). The moulding processes (injection and/or compression moulding) of polymer materials allow highly integrated, tool reduced mass production of tailored stack components like the BP, the endplate, cell frame and peripheral components. The objective of this thesis is to describe the development of an conductive functionalised material suitable for moulding BPP, to investigate compounding optimisation methods (DOE) and evaluate the best fit parameters, to analyse the rheological behaviour of these highly filled compounds, to discuss suitable polymer related manufacturing processes like hot pressing, injection moulding and profile extrusion to mould BPP at a low cost level and to characterize these with different techniques as well as with different material combinations moulded BPP insitu in a fuel cell testing device either as single-cell setup with an active area of 25 cm{sup 2} or in a three-cell Stack with an active area of 75 cm{sup 2}. (orig.)

  5. Possibilities for using a temperature-controlled pyrolysis method in order to determine the bonding form of mecury in soils and sediments; Moeglichkeiten der Anwendung eines temperaturgesteuerten Pyrolyseverfahrens zur Bestimmung der Bindungsform des Quecksilbers in Boeden und Sedimenten

    Energy Technology Data Exchange (ETDEWEB)

    Biester, H.

    1994-12-31

    The bonding behaviour of mercury in solids was investigated by means of a temperature-controlled pyrolysis method. Starting from the special property of elemental mercury to evaporate already at room temperature, a method was developed which permits to characterize different mercury bonding forms on the basis of Hg evaporation behaviour from solids at continuously increased temperature. The method starts from the assumption that it is possible to thermally reduce compounded mercury and release it in elemental form. The focus of the work was on the study of Hg bonding behaviour in soils and sediments. The soil samples used were from the areas of two mercury deposits, different kyanizing sites, some former mirror factories, and a chlor-alkali electrolysis workshop. The investigated sediments are a collection of mercury-polluted samples from the rivers Elbe, Rhine, Murg, the Rio Sao Joao de Meriti (Brazil) and some brooks and rivers of the Saar-Nahe depression. (orig./EF) [Deutsch] In der vorliegenden Arbeit wurde das Bindungsverhalten von Quecksilber in Feststoffen mittels eines temperaturgesteuerten Pyrolyseverfahrens untersucht. Ausgehend von der besonderen Eigenschaften des elementaren Quecksilbers, bereits bei Zimmertemperatur zu verdampfen, wurde ein Verfahren entwickelt, das eine Charakterisierung verschiedener Quecksilberbindungsformen aufgrund des Abdampfverhaltens des Hg aus dem Feststoff unter kontinuierlicher Temperaturerhoehung zulaesst. Dem Verfahren liegt dabei die Annahme zugrunde, dass sich das Quecksilber in seinen Verbindungen thermisch reduzieren und in elementarer Form freisetzen laesst. Durch den kontinuierlichen Aufheizprozess erfolgt die Freisetzung des Quecksilbers in Abhaengigkeit von der Bindungsstaerke in unterschiedlichen Temperaturbereichen. Die Darstellung der Ergebnisse erfolgte in Form von Abdampfkurven, die die Extinktion in Abhaengigkeit von der Temperatur darstellen. Der Schwerpunkt dieser Arbeit lag auf der Untersuchung des Bindungsverhaltens des Quecksilbers in Boeden und Sedimenten. Die untersuchten Bodenproben stammen aus den Bereichen zweier Quecksilberlagerstaetten, verschiedener Kyanisierplaetze, einiger ehemaliger Spiegelfabriken und aus dem Bereich einer Chlor-Alkali-Elektrolyse. Die untersuchten Sedimente stellen eine Auswahl quecksilberbelasteter Proben aus Elbe, Rhein, Murg, dem Rio Sao Joao de Meriti (Brasilien) und einigen Baechen und Fluessen der Saar-Nahe-Senke dar. (orig./EF)

  6. Ribosomal studies on the 70S ribosome of E.coli by means of neutron scattering; Strukturuntersuchungen am 70S-Ribosom von E.coli unter Anwendung von Neutronenstreuung

    Energy Technology Data Exchange (ETDEWEB)

    Burkhardt, N. [GKSS-Forschungszentrum Geesthacht GmbH (Germany). Inst. fuer Werkstofforschung

    1997-12-31

    Ribosomes are ribonucleo-protein complexes, which catalyse proteinbiosynthesis in all living organisms. Currently, most of the structural models of the prokaryotic 70S ribosome rely on electron microscopy and describe mainly the outer shape of the particle. Neutron scattering can provide information on the internal structure of the ribosome. Parts of the structure can be contrasted for neutrons by means of an isotopic exchange of the naturally occurring hydrogen ({sup 1}H) for deuterium ({sup 2}H), allowing direct measurements in situ. Specifically deuterium-labeled ribosomes (E. coli) were prepared and analysed with neutron scattering. The biochemical methods were established and combined to a generally applicable preparation system. This allows labeling of all ribosomal components in any combination. A systematic analysis of the protein and RNA phases resulted in the development of a new model for the 70S ribosome. This model describes not only the outer shape of the particle, but displays also an experimentally determined internal protein-RNA distribution and the border of subunits for the first time (four-phase model; resolution: 50A). Models of the 70S ribosome from other studies were evaluated and ranked according to consistency with the measured scattering data. Applying a new neutron scattering technique of particular sensitivity, the proton-spin contrast-variation, single proteins could be measured and localized. The positions of the proteins S6 and S10 were determined, providing the first coordinates of protein mass centers within the 70S ribosome. (orig.) [Deutsch] Ribosomen sind Ribonukleinsaeure-Protein Komplexe, die in allen lebenden Organismen die Proteinbiosynthese katalysieren. Strukturmodelle fuer das prokaryontische 70S-Ribosom beruhen derzeit vorwiegend auf elektronenmikroskopischen Untersuchungen und beschreiben im wesentlichen die aeussere Oberflaeche des Partikels. Informationen ueber die innere Struktur des Ribosoms koennen Messungen mit Neutronenstreuung liefern. Durch den Austausch des natuerlichen Wasserstoffs ({sup 1}H) gegen Deuterium ({sup 2}H) lassen sich Teilstrukturen des Komplexes fuer Neutronen kontrastieren und direkt in situ vermessen. Im Rahmen der vorliegenden Arbeit wurden solche deuterium-markierten Ribosomenpraeparate (E. coli) hergestellt und mit Neutronen analysiert. Die erforderlichen biochemischen Methoden wurden etabliert und zu einem allgemein anwendbaren Praeparationssystem zusammengefasst. Es koennen damit alle Komponenten des 70S-Ribosoms in beliebiger Kombination markiert werden. Auf der Grundlage einer systematischen Analyse der Protein- und RNA-Phasen konnte ein neues 70S-Ribosomenmodell entwickelt werden, das nicht nur die aeussere Form des Partikels beschreibt, sondern erstmals auch eine vermessene interne Protein-RNA-Verteilung und den Verlauf der Untereinheitengrenze angibt (Vierphasen-Modell; Aufloesung: 50 A). 70S-Ribosomenmodelle aus anderen Studien wurden anhand der gemessenen Streudaten beurteilt und gewichtet. Mit Hilfe einer neuen, besonders empfindlichen Neutronenstreutechnik, der Protonenspin-Kontrastvariation, gelang es ausserdem, einzelne markierte Proteine zu vermessen und zu lokalisieren. Mit den Positionen von S6 und S10 werden die ersten im 70S-Ribosom vermessenen Proteinschwerpunktskoordinaten vorgelegt. (orig.)

  7. Organic semiconductors. Fundamental aspects of metal contacts, highly ordered films and the application in field effect transistors; Organische Halbleiter. Fundamentale Aspekte von Metallkontakten, hochgeordneten Schichten und deren Anwendung in Feldeffekttransistoren

    Energy Technology Data Exchange (ETDEWEB)

    Sachs, Soenke

    2010-05-31

    In this thesis, fundamental aspects of organic semiconductor devices are investigated and incorporated into the construction and optimization of an organic semiconductor field effect transistor (OFET). In order to approach the ''high end'' of OFETs, elaborate steps to optimize the devices are taken, despite the fact that they might not be feasible in a direct application. Well-characterized model systems are selected to study fundamental properties of devices, in particular the electronic structure at molecule/metal contacts and in the organic semiconductor bulk, as well as the growth of organic semiconductor molecules on single crystalline insulator substrates. The realization of a high performance OFET is pursued by a comprehensive approach in order to optimize particularly the interfaces of the device. Considerable progress is made towards a working OFET with best possible properties. A primary focus of this work, the investigation of the electronic structure at molecule/metal contacts and in the molecular bulk of the model system PTCDA/Ag(111) is performed using two photon photoelectron spectroscopy (2PPE). Of special interest is the excitation of the lowest unoccupied molecular orbital (LUMO) that shows different energetic relaxation mechanisms, depending on the origin of excitation. In addition to the importance of the molecule/metal contacts, the performance of OFETs is determined to a large extend by the quality of the organic semiconductor/gate insulator interface where the charge carrier channel is established. The morphology and structure of a molecular layer are investigated for diindenoperylene (DIP) molecules, adsorbed on a single crystalline Al{sub 2}O{sub 3} substrate, by atomic force microscopy and optical microscopy. Dependent on the substrate temperature during growth, the morphology shows grains with lateral dimensions of about 200 nm at 350 K which increase up to 700 nm at 450 K. This change in morphology is accompanied by an increase of roughness, indicating a change of the growth mode, at higher temperatures. At slightly higher temperatures of about 460 K, the growth of crystallites is observed. Depending on the particular preparation parameters, three different types of crystallites develop: mesa crystallites with lateral dimensions up to several microns, dendritic crystallites, characterized by kinetic growth processes, and layered crystallites, that are bent in three dimensions. Possibilities to utilize the grown crystallites in OFETs are discussed and the mesa type is found to be the most promising. The comprehensive concept for the development of a high performance OFET is introduced and refined in details. Improvements are made especially in the construction of the gate electrode that will be attached beneath the Al{sub 2}O{sub 3} substrate. To thin out the substrate, a drilling technique is improved and combined with wet chemical etching, resulting in gate insulator thicknesses below 10 {mu}m. On the basis of this preparatory work few first OFETs were built. As a first step towards the electrical characterization of DIP-OFETs, OFETs based on Silicon-oxide were successfully prepared and characterized. Moreover, present challenges and possible improvements towards a high performance OFET are discussed. (orig.)

  8. Development of a regional concept for energy management for the region of Karlsruhe. Final report; Entwicklung eines regionalen Energiemanagement-Konzeptes und Anwendung auf die TechnologieRegion Karlsruhe. Endbericht

    Energy Technology Data Exchange (ETDEWEB)

    Rentz, O.; Fichtner, W.; Frank, M. [Karlsruhe Univ. (T.H.) (Germany). Inst. fuer Industriebetriebslehre und Industrielle Produktion; Wolf, M.A.; Rejman, M.; Eyerer, P. [Fraunhofer-Institut fuer Chemische Technologie (ICT) (Germany); Reimert, R.; Schulz, A.; Buren, V. v. [Karlsruhe Univ. (T.H.) (Germany). Engler-Bunte-Institut Bereich 1 - Gas, Erdoel und Kohle; Schaefers, B.; Bernart, Y. [Karlsruhe Univ. (T.H.) (DE). Institut fuer Soziologie (IfSoz) (Germany)

    2002-09-01

    Major objectives of this project are: to prepare a cross-disciplinary analysis of all characteristic aspects of the energy supply and demand patterns of a group of selected energy-intensive companies in the Karlsruhe and Rhine harbour area (5 industrial power consumers, 1 utility), to identify practical approaches for optimization and integration of energy and material flows, (networking), and to develop optimised investment and energy supply options within the framework of given conditions. The basis of the optimal solution and energy network presented and explained in detail is a new combined-cycle power plant running as a gas-fired CHP plant, substituting about 50% of the systems formerly used. (orig./CB) [German] Fragestellungen der Effizienzsteigerung und der Verwertung von Abfaellen und Abwaerme gewinnen an Relevanz vor dem Hintergrund der begrenzten Aufnahmekapazitaet der Umweltmedien fuer Schadstoffe. Im Rahmen des Projektes wurde am Beispiel der Region Karlsruhe (5 Industrieunternehmen und 1 EVU) die Entwicklung betriebsuebergreifender Energieversorgungssysteme (Netzwerke) interdisziplinaer analysiert und beschrieben. Zielsetzungen des Projekts waren unter anderem: Bestimmung von zukunftsfaehigen Optionen, intelligente Vernetzung von Energiestroemen, wirtschaftliche Optimierung betriebsuebergreifender Energiemanagement-Loesungen. Die optimale vorgestellte Loesung ist charakterisiert durch den Neubau einer zentralen, gasgefeuerten GuD-Anlage, die etwa die Haelfte der bisherigen Anlagen ersetzt und zusammen mit den weiterhin genutzten Anlagen die Energieversorgung der Unternehmen sicherstellt. (orig./CB)

  9. Planning, installation and use of ventilation systems for smoke and heat removal. Cooperation between architects, planners, and builder-owners; Planung, Einbau und Anwendung von Rauch- und Waermeabzugsanlagen. Zusammenwirken zwischen Architekt, Planer und Bauherr

    Energy Technology Data Exchange (ETDEWEB)

    Koschnitzki, K. [Duisburg Univ. (Germany). Inst. fuer Anlagenplanung und Systemtechnik; Berg, M. [e.t.s. Umwelt- und Sicherheitstechnik GmbH, Kleve (Germany)

    1998-05-01

    Cooperation between planners, builder-owners and technical experts is important for efficient fire prevention. This involves ventilation systems for smoke and heat removal as well as other safety components. Legal regulations must be implemented so as to obtain a fire protection concept with defined goals and to achieve maximum protection of furniture and inhabitants. (orig.) [Deutsch] Bei der Umsetzung von Brandschutzkonzepten in der Gebaeude- und Anlagenplanung ist das gemeinsame Vorgehen von Planer, Bauherr und Fachunternehmen von elementarer Wichtigkeit fuer ein ausgereiftes Sicherheitskonzept. Hierzu gehoeren Rauch- und Waermeabzugsanlagen und weitergehende sicherheitstechnische Komponenten. Auflagen und behoerdliche Bestimmungen sind so umzusetzen, dass ein Brandschutzkonzept mit definierten Schutzzielen entsteht. Fuer den Bauherrn soll ein maximaler Sachwert- und Personenschutz gewaehrleistet sein. (orig.)

  10. Development, validation and application of a process for the generation of long-term stable VOC gas mixtures; Entwicklung, Validierung und Anwendung eines Verfahrens zur Erzeugung langzeitstabiler VOC-Gasgemische

    Energy Technology Data Exchange (ETDEWEB)

    Richter, Matthias

    2010-07-01

    The development as well as the validation of a gas mixing system (GMS) that enables dynamic and traceable production of stable long-term VOC gas mixtures within the range between a few {mu}g/m{sup 3} and a few 100 {mu}g/m{sup 3}, is discussed. In this method pure liquid substances that are filled into stainless steel bottles are kept separately at a constant temperature, evaporated according to their vapour pressure and removed by a small inert gas flow. They are finally united in a gas mixing chamber. The carrier gas must be as small as possible so that the quasi-equilibrium between the gas space and the liquid phase in the substance bottles will not be disturbed. The carrier gas is assumed to be saturated with substance gas due to a long residence time in the bottles and a fast phase transition. Any concentration level of the gas mixture can be generated by a combination of vaporization temperature, carrier and dilution gas flows. With the GMS a mixture of 25 VOCs was prepared. For 16 compounds stable and reproducible gas concentrations were realized. Due to not completely removed leakage of some substance bottles and the tubing respectively, variation of the concentration of the remaining compounds was found. A sink effect as another reason for this variation could be expelled and the chemical stability of the vaporized substances proved with the exception of some aldehydes. The procedure was successfully applied in a round robin test and a material test. In the latter adsorption of VOCs on building products was scrutinized. In this way the applicability of the GMS could be shown. (orig.)

  11. Chitosan pads vs. manual compression to control bleeding sites after transbrachial arterial catheterization in a randomized trial; Randomisierte Untersuchung zur Anwendung eines Chitosan-Gerinnungspads zur Blutstillung bei transbrachialen Angiographien

    Energy Technology Data Exchange (ETDEWEB)

    Poretti, F.; Rosen, T.; Koerner, B.; Vorwerk, D. [Inst. fuer diagnostische und interventionelle Radiologie, Klinikum Ingolstadt (Germany)

    2005-09-01

    Purpose: until now, no mechanical closure devices were available to achieve fast and secure hemostasis for vessel closure after catheterization of small arterial vessels. Material and methods: eighty patients were randomized to evaluate the effect on hemostasis by use of a chitosan pad (Chito-Seal, Abbott Vascular Devices, Galway/Ireland) in comparison to manual compression after diagnostic transbrachial arterial catheterization. Hemostasis after three minutes and one hour as well as local development of a hematoma after one and twenty-four hours were assessed. Results: the use of chitosan pads significantly decreased the bleeding time in the first three minutes after manual compression time (p < 0.01). Significant decrease in bleeding risk at three minutes by use of the chitosan closure pads was also found in subgroups of patients with hypertension (p < 0.001) or diabetes (p < 0.01) and also in patients under anticoagulation therapy (p < 0.01). In addition, long-term protection from bleeding complications such as the risk of hematoma was decreased by the use of chitosan closure pads one hour (p < 0.01) or twenty-four hours (p < 0.001) after catheter removal. Conclusion: the use of an intravascular anchor or suture system is not safely applicable in these vessels due to the small diameter of the brachial artery. Our results document a significant improvement in hemostasis by using chitosan pads in these cases. (orig.)

  12. Temperature dependent electronic structure and magnetism of metallic systems with localized moments. Application on gadolinium; Temperaturabhaengige elektronische Struktur und Magnetismus von metallischen Systemen mit lokalisierten Momenten. Anwendung auf Gadolinium

    Energy Technology Data Exchange (ETDEWEB)

    Santos, C.A.M. dos

    2005-06-24

    This thesis focuses on the theoretical investigation of the temperature dependent electronic and magnetic properties of metallic 4f-systems with localized magnetic moments. The presented theory is based on the Kondo-lattice model, which describes the interaction between a system of 4f-localized magnetic moments and the itinerant conduction band electrons. This interaction is responsible for a remarkable temperature dependence of the electronic structure mainly induced by the subsystem of 4f-localized moments. The many-body problem provoked by the Kondo-lattice model is solved by using a moment conserving Green function technique, which takes care of several special limiting cases. This method reproduces the T=0-exact solvable limiting case of the ferromagnetically saturated semiconductor. The temperature dependent magnetic properties of the 4f-localized subsystem are evaluated by means of a modified Rudermann-Kittel-Kasuya-Yosida (RKKY) type procedure, which together with the solution of the electronic part allows for a self-consistent calculation of all the electronic and magnetic properties of the model. Results of model calculations allow to deduce the conditions for ferromagnetism in dependence of the electron density n, exchange coupling J and temperature T. The self-consistently calculated Curie temperature T{sub C} is presented and discussed in dependence of relevant parameters (J, n, and W) of the model. The second part of the thesis is concerned with the investigation of the temperature dependence of the electronic and magnetic properties of the rare-earth metal Gadolinium (Gd). The original Kondo-lattice model is extended to a multi-band Kondo-lattice model and combined with an ab-initio band structure calculation to take into account for the multi-bands in real systems. The single-particle energies of the model are taken from an augmented spherical wave (ASW) band structure calculation. The proposed method avoids the double counting of relevant interactions by exploiting the T=0-exact limiting case of the ferromagnetically saturated semiconductor and takes into account the correct symmetry of the atomic orbitals. The only parameter of the theory (inter-band exchange coupling J) is uniquely fixed by the band structure calculation. The self-consistently derived Curie temperature of 294.1 K and the T=0-magnetic moment of 7.71 {mu}{sub B} are surprisingly close to the experimental values. The induced temperature-dependence of the 5d conduction bands explains respective experimental photoemission data. (orig.)

  13. Methods of analysis in terms of effects and their application to toxic organic constituents of industrial waste water; Methoden und Anwendung der wirkungsbezogenen Analytik auf toxische organische Inhaltsstoffe in industriellen Abwaessern

    Energy Technology Data Exchange (ETDEWEB)

    Reemtsma, T.; Putschew, A.; Jekel, M. [Technische Univ. Berlin (Germany). Fachgebiet Wasserreinhaltung

    1999-07-01

    Coupling biological action detection with chemical sewage analysis opens up a broad spectrum of methods involving diverse amounts of effort, whose results can range from hints to ways of eliminating a toxic effect to the identification and quantification of individual toxic constituents even in complex waste water. These methods help recognizing problems with effluent quality and enhancing treatment concepts. As possible biological effects of sewage discharges into receiving bodies of water (including sublethal effects) are meeting with increasing attention, the importance of sewage analysis in terms of effects will acquire even greater weight. Automated and miniaturized processes can cut down the involved effort substantially in the future. (orig.) [German] Die Kopplung der biologischen Wirkungsdetektion mit chemischer Abwasseranalytik eroeffnet ein breites Spektrum unterschiedlich aufwendiger Methoden, deren Ergebnisse von Hinweisen auf Methoden zur Entfernung einer toxischen Wirkung bis zur Identifizierung und Quantifizierung einzelner toxischer Inhaltsstoffe auch in komplexer Abwaessern reichten koennen. Diese Methoden helfen beim Erkennen von Problemen in der Ablaufqualitaet und unterstuetzen bei der Verbesserung von Behandlungskonzepten. Mit steigender Beachtung moeglicher biologischer Wirkungen von Abwassereinleitungen im Vorfluter (unter Einbeziehung sublethaler Effekte) wird die Bedeutung der wirkungsbezogenen Abwasseranalytik noch zunehmen. Automatisierte und miniaturisierte Verfahren koennen zukuenftig den dabei zu treibenden Aufwand wesentlich vermindern. (orig.)

  14. Ribosomal studies on the 70S ribosome of E.coli by means of neutron scattering; Strukturuntersuchungen am 70S-Ribosom von E.coli unter Anwendung von Neutronenstreuung

    Energy Technology Data Exchange (ETDEWEB)

    Burkhardt, N [GKSS-Forschungszentrum Geesthacht GmbH (Germany). Inst. fuer Werkstofforschung

    1998-12-31

    Ribosomes are ribonucleo-protein complexes, which catalyse proteinbiosynthesis in all living organisms. Currently, most of the structural models of the prokaryotic 70S ribosome rely on electron microscopy and describe mainly the outer shape of the particle. Neutron scattering can provide information on the internal structure of the ribosome. Parts of the structure can be contrasted for neutrons by means of an isotopic exchange of the naturally occurring hydrogen ({sup 1}H) for deuterium ({sup 2}H), allowing direct measurements in situ. Specifically deuterium-labeled ribosomes (E. coli) were prepared and analysed with neutron scattering. The biochemical methods were established and combined to a generally applicable preparation system. This allows labeling of all ribosomal components in any combination. A systematic analysis of the protein and RNA phases resulted in the development of a new model for the 70S ribosome. This model describes not only the outer shape of the particle, but displays also an experimentally determined internal protein-RNA distribution and the border of subunits for the first time (four-phase model; resolution: 50A). Models of the 70S ribosome from other studies were evaluated and ranked according to consistency with the measured scattering data. Applying a new neutron scattering technique of particular sensitivity, the proton-spin contrast-variation, single proteins could be measured and localized. The positions of the proteins S6 and S10 were determined, providing the first coordinates of protein mass centers within the 70S ribosome. (orig.) [Deutsch] Ribosomen sind Ribonukleinsaeure-Protein Komplexe, die in allen lebenden Organismen die Proteinbiosynthese katalysieren. Strukturmodelle fuer das prokaryontische 70S-Ribosom beruhen derzeit vorwiegend auf elektronenmikroskopischen Untersuchungen und beschreiben im wesentlichen die aeussere Oberflaeche des Partikels. Informationen ueber die innere Struktur des Ribosoms koennen Messungen mit Neutronenstreuung liefern. Durch den Austausch des natuerlichen Wasserstoffs ({sup 1}H) gegen Deuterium ({sup 2}H) lassen sich Teilstrukturen des Komplexes fuer Neutronen kontrastieren und direkt in situ vermessen. Im Rahmen der vorliegenden Arbeit wurden solche deuterium-markierten Ribosomenpraeparate (E. coli) hergestellt und mit Neutronen analysiert. Die erforderlichen biochemischen Methoden wurden etabliert und zu einem allgemein anwendbaren Praeparationssystem zusammengefasst. Es koennen damit alle Komponenten des 70S-Ribosoms in beliebiger Kombination markiert werden. Auf der Grundlage einer systematischen Analyse der Protein- und RNA-Phasen konnte ein neues 70S-Ribosomenmodell entwickelt werden, das nicht nur die aeussere Form des Partikels beschreibt, sondern erstmals auch eine vermessene interne Protein-RNA-Verteilung und den Verlauf der Untereinheitengrenze angibt (Vierphasen-Modell; Aufloesung: 50 A). 70S-Ribosomenmodelle aus anderen Studien wurden anhand der gemessenen Streudaten beurteilt und gewichtet. Mit Hilfe einer neuen, besonders empfindlichen Neutronenstreutechnik, der Protonenspin-Kontrastvariation, gelang es ausserdem, einzelne markierte Proteine zu vermessen und zu lokalisieren. Mit den Positionen von S6 und S10 werden die ersten im 70S-Ribosom vermessenen Proteinschwerpunktskoordinaten vorgelegt. (orig.)

  15. Application and further development of models for the final repository safety analyses on the clearance of radioactive materials for disposal. Final report; Anwendung und Weiterentwicklung von Modellen fuer Endlagersicherheitsanalysen auf die Freigabe radioaktiver Stoffe zur Deponierung. Abschlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Artmann, Andreas; Larue, Juergen; Seher, Holger; Weiss, Dietmar

    2014-08-15

    The project of application and further development of models for the final repository safety analyses on the clearance of radioactive materials for disposal is aimed to study the long-term safety using repository-specific simulation programs with respect to radiation exposure for different scenarios. It was supposed to investigate whether the 10 micro Sv criterion can be guaranteed under consideration of human intrusion scenarios. The report covers the following issues: selection and identification of models and codes and the definition of boundary conditions; applicability of conventional repository models for long-term safety analyses; modeling results for the pollutant release and transport and calculation of radiation exposure; determination of the radiation exposure.

  16. Measurements of vertical displacement of power station buildings using an automatic stationary hydrostatic measuring system; Anwendung des automatisierten stationaeren hydrostatischen Messsystems fuer die Aufnahme der Vertikalverschiebungen an den Objekten der Kern- und Waermekraftwerke

    Energy Technology Data Exchange (ETDEWEB)

    Lechner, J. [Forschungsinstitut fuer Geodaesie, Topographie und Kartographie, Zdiby (Czechoslovakia)

    1996-12-31

    The contribution describes hydrostatic stationary measuring systems for measurements of height variations of a turbine unit. The measuring system developed at the research institute and the algorithms for calibration, measurement and evaluation are presented. Measurements were made on a 500 MW turbogenerator unit at different states of operation. (orig.) [Deutsch] Der Beitrag enthaelt eine kurze Uebersicht ueber die hydrostatischen stationaeren Messsysteme fuer das Gebiet der Messung der Hoehenaenderung eines Grossturbinentisches. Es wird das automatische stationaere hydrostatische Messsystem, das im Forschungsinstitut entwickelt wurde, der Algorithmus der Kalibrierung, der Messung und der Auswertung der Messergebnisse vorgestellt. Es wird das Messergebnis der Vertikalverschiebungen der Konstruktion des Turbogenerators mit der Leistung 500 Megawatt bei seinem verschiedenen Betriebszustand angefuehrt. (orig.)

  17. Further development of the radioimmunoassay for carcinoembryonic antigen and the use of the measurement of the carcinoembryonic antigen in stools. Weiterentwicklung des Radioimmunoassay fuer carcino-embryonales Antigen und Anwendung auf die Messung von carcino-embryonalem Antigen im Stuhl

    Energy Technology Data Exchange (ETDEWEB)

    Britsch, R F

    1982-01-01

    A specific, direct CEA-RTA is presented with sequential saturation and double antibody separation and using guinea pig CEA anti-serums, whose isolated CEA was marked with /sup 125/I for tracer production and used as was for a CEA standard. This RIA was tested on serum from patients with colorectal and stomach-esophagus carcinomas and from healthy persons, whereby it showed a good sensitivity in comparison to control serums on the market. CEA is also present in a high concentration in the stools, however very nonhomogeneously distributed, by patients as well as healthy persons. An increased stool CEA value does not necessarily indicate a carcinomatic disease or even a preliminary stage. During a screening a carcinomatic intestinal disorder should not be looked for intensively unless there are first several positive stool CEA values or additional positive blood evidence in the stool. Simultaneously carried out determinations of serum and stool CEA allows for the discovery of more patients as the use of only one. (TRV)

  18. The criminal law as an instrument under environmental law in the Netherlands. A survey of the basic legal principles and instruments and their application. Das niederlaendische Umweltstrafrecht. Eine Untersuchung zu den dogmatischen Grundlagen und zur praktischen Anwendung

    Energy Technology Data Exchange (ETDEWEB)

    Waling, C.

    1991-01-01

    This book is published in the German language in order to give non-Dutch speaking readers access to and insight into the criminal law applicable in the Netherlands for enforcement of the environmental law. This very comprehensive study discusses the substantive criminal environmental law, its enforcement in practice, and the international criminal law of the Netherlands. Emphasis is placed on the critical evaluation and comparison of the law and day-to-day practice, with this part of the study including a comparison with the situation in the Federal Republic of Germany. The authoress presents recommendations for improving the efficiency of the criminal law system available in the Netherlands for environmental matters. (orig./HP).

  19. The ``Grey System`` theory and its application to target cost forecasting at Chinese collieries; Die Theorie des grauen Systems und ihre Anwendung bei der Prognose der Zielkosten des gesamten Bergwerks

    Energy Technology Data Exchange (ETDEWEB)

    Ding Rijia; Yi Maosheng; Wang Shiyuan

    1997-09-01

    A production-cost forecasting system has been developed for use at Chinese collieries. Known as the `Grey System`, the theory and model-based process distinguishes between `white` information, which is human controlled, `black` information, which cannot be controlled by human actions, and `grey information`, which forms the majority component and comprises information which can only be partly or not completely collected. A grey system is therefore one in which the necessary information is absent. Future developments in the system can be forecast by analysing the regularity of the time-series values for the technical and economic characteristics of previous periods. The system employs the GM (1.1) prognostic model, which is a `grey` systematic forecasting model with one variable and one linear differential equation. It can be applied to systems which are affected simultaneously be several factors, with no overriding main factor, or in which no marked regularity exists between the controlling factors. The mathematical model constructed on the basis of the `Grey theory` is designed for large-scale economic systems which are affected by several control factors. A bigger system makes for a greater randomness element, which in turn lessens the influence of subjective interference factors and increases the accuracy of the prognosis. (orig./MSK) [Deutsch] Mit Hilfe der Theorie und von Modellen des `grauen Systems` wird eine Prognose der Produktionskosten von chinesischen Bergwerken erstellt. Die Theorie des `grauen Systems` unterscheidet zwischen den von den Menschen beherrschbaren `weissen` Informationen, den von den Menschen nicht beherrschbaren `schwarzen` Informationen und der ueberwiegenden Anzahl der Informationen, die nur teilweise oder nicht vollstaendig erfasst werden koennen und als `graue` Informationen bezeichnet werden. Ein graues System ist folglich ein System, in dem es an notwendigen Informationen fehlt. Die zukuenftige Entwicklung des Systems kann dadurch prognostiziert werden, dass die Regelmaessigkeiten von den Zeitreihenwerten der technischen und wirtschaftlichen Kennziffern vergangener Perioden aufgesucht werden. Angewendet wird das Prognosemodell GM (1,1). GM (1,1) ist ein graues Modell zur systematischen Prognose mit einer Variablen und einer linearen Differentialgleichung. (orig./MSK)

  20. Contribution to the grain refinement of hypoeutectic aluminium-silicon casting alloys: application of a new grain refiner and experience from practice; Beitrag zur Kornfeinung von untereutektischen Aluminium-Silicium-Gusslegierungen: Anwendung eines neuen Kornfeiners und Erfahrungen aus der Praxis

    Energy Technology Data Exchange (ETDEWEB)

    Koch, H. [Aluminium Rheinfelden GmbH, Rheinfelden (Germany)

    2000-10-01

    This paper describes the application of a master alloy on the basis of aluminium-titanium-boron, that is designed for hypoeutectic aluminium-silicon casting alloys. The efficiency of the grain refiner was measured using thermal analysis and sand and permanent mould casted samples. The grain size was measured using metallographic technique. In addition, casting trials using a spiral sand mould were carried out to estimate the influence on the flowing behaviour of the melt. To compare the results, a standard AlTi5B1 rod was used under the same test conditions. Finally, results from practice are shown. The grain refinement mechanism is discussed. (orig.)

  1. Development of an advanced dispersion model for regulatory purposes; Ueberpruefung der Grundlagen der Ausbreitungsrechnung der TA Luft im Hinblick auf eine EG-Harmonisierung: Entwicklung eines fortschrittlichen Ausbreitungsmodells zur Anwendung im Rahmen von Genehmigungsverfahren

    Energy Technology Data Exchange (ETDEWEB)

    Scherer, B.; Reimer, E. [Freie Univ. Berlin (Germany). Inst. fuer Meteorologie; Yamartino, R.J. [Earth Tech., Inc., Concord, MA (United States); Klug, W. [Technische Hochschule Darmstadt (Germany). Inst. fuer Meteorologie

    1998-12-01

    A new Lagrangian Particle Model and a meteorological suite to operate the model were developed during phase 1 of the project. The model-system was applied for a long term calculation. The new Kinematic Simulation Particle Dispersion Model (KSP) uses Kinematic Simulation and Monte-Carlo (KS-MC) theory to calculate sub-grid flowfields. It calculates snapshots of concentrations rater then ensemble mean values. It can also directly provide higher moments of concentrations, C{sup (n)}(t) and is applicable for odour problems as well. The model is applicable in a wide spatial (<10-10{sup 3} km) and temporal scale (sec. to years). The meteorological model TRAMPER includes a date archive 3d Objective Analysis with statistical O/I method and a 1-d boundary-layer model as well as prognostic non-hydrostatic model (GESIMA). The analysis provides a three dimensional and time dependent description of relevant meteorological scalar and vector quantities also trajectories in a approx. 30 km grid resolution. Higher resolution is gained by GESIMA (example). As an alternative driver the CALMET Meteorological Model is presented. The evaluation of the KSP will take place in phase 2. Only preliminary results are shown in the report. (orig.) [German] In Phase 1 des Vorhabens wurde ein neues Lagrange - Partikel - Modell (LPM) mit einer meteorologischen Simulationsumgebung (Treiber) entwickelt und fuer eine immissionsklimatologische Berechnung eingesetzt. Das 'Kinematic Simulation Particle' - Ausbreitungsmodell (KSP) arbeitet mit einem subskaligen Stroemungsprozessor nach der 'Kinematic Simulation - Monte Carlo-Methode. Es berechnet Momentanwerte und nicht Ensemblemittelwerte sowie Varianzen und hoehere zeitliche Momente der Konzentration C{sup (n)}(t) und ist fuer die Geruchsausbreitungsrechnung geeignet. Das Verfahren erfasst einen weiten raeumlichen (<10-10{sup 3} km) und zeitlichen Skalenbereich (Sek. bis Jahre). Das meteorologische Modellsystem TRAMPER als Treiber umfasst Datenarchiv, dreidimensionale Objektive Analyse mit statischer Interpolation, 1-d-Grenzschichtmodell und nichthydrostatisches Modell (GESIMA). Erzeugt werden u.a. 3-d-Stroemung, Mischungsschichthoehe und mikrophysikalische Variablen in einem Gitter mit ca. 30 km Aufloesung. Hoehere Aufloesung wird mit GESIMA erzielt (Beispiel) Als alternativer Treiber wird das meteorologische Modell CALMET vorgestellt. Die Evaluierung des KSP ist in der Phase 2 des Vorhabens vorgesehen. Vorlaeufige Ergebnisse koennen in diesem Bericht gezeigt werden. (orig.)

  2. A method for load management in low voltage grids. Application from e-mobility to heat storage; Verfahren zum Lastmanagement in Niederspannungsnetzen. Anwendung von E-Mobility bis Waermespeicher

    Energy Technology Data Exchange (ETDEWEB)

    Hess, Tobias; Schegner, Peter [TU Dresden (Germany). IEEH; Hable, Matthias [ENSO NETZ GmbH, Dresden (Germany)

    2012-07-01

    With the expected charging characteristic of e-mobility a considerable load peak during the night is expected. The paper describes the application of a modified maximal rectangle algorithm to determine the optimal starting times for charging to realise a flat load curve. The load characteristic of e-mobility is similar to heat storage. This allows to use the currently widely spread heat storage devices as example for developing and testing methods for optimized load management in low voltage networks. It is shown that the developed optimization algorithm finds solutions close to the global optimum even in large networks ({approx} 25000 devices) with low requirements of calculation time (< 1 min). (orig.)

  3. A model for the description of the coolant mixing and its application to the analysis of boron dilution transients in pressurized water reactors; Ein Modell zur Beschreibung der Kuehlmittelvermischung und seine Anwendung auf die Analyse von Borverduennungstransienten in Druckwasserreaktoren

    Energy Technology Data Exchange (ETDEWEB)

    Kliem, Soeren

    2010-08-15

    A model for the realistic description of the coolant mixing inside the pressure vessel of a pressurized water reactors has been developed and validated. This fast running model is based on the linear superposition of response functions on Dirac-pulse-like perturbations of the coolant parameters. It has been implemented into the coupled code system DYN3D/ATHLET nad serves as the interface between the one-dimensional thermal hydraulic system code ATHLETE and the 3D neutron kinetic core model DYN3D. By help of this model, the coolant mixing inside the reactor pressure vessel can e simulated in an efficient manner. A methodology for this analysis of hypothetical boron dilution accidents has been developed, which is based on the newly developed model for the coolant mixing. This methodology consists of a combination of stationary and transient calculations including a realistic treatment of the mixing of deborated slugs on the way towards the reactor core. The degree of conservatism can be adjusted by the variation of the initial size of the deborated slug. This new method was applied to two different boron dilution accidents. Besides the start of the first main coolant pump with a deborated slug of coolant in the cold leg of the primary circuit, a deboration event during the operation of the residual heat removal system was investigated. The results of the parameter study for a reactor core with a generic loading pattern demonstrated in both cases, that although the shut-down reactor becomes re-critical safety relevant cladding temperature limits are not reached, even if maximum possible volumes of the deborated slug are considered. The main reason for these results is the use of realistic time-dependent distributions of the boron concentration at the inlet of each fuel assembly.

  4. Development and application of a tree-code in simulation scenarios of the plasma-wall interaction; Entwicklung und Anwendung eines Tree-Codes in Simulationsszenarios der Plasma-Wand-Wechselwirkung

    Energy Technology Data Exchange (ETDEWEB)

    Berberich, Benjamin

    2012-03-15

    Processes in the plasma edge layer of magnetic fusion devices occur on widely disparate length- and time-scales. Also recently developed features in this particular region, such as stochastic magnetic fields, underline the necessity for three dimensional, full-kinetic simulation tools. Contemporary programs often deploy ad hoc assumptions and approximations for microscopic phenomena for which self-consistent ab initio models in principle exist, but are still computationally too expensive or complex to implement. Recently, mesh-free methods have matured into a new class of tools for such first-principles computations which thanks to their geometric flexibility are highly promising for tackling complicated TOKAMAK regions. In this work we have develop the massively parallel Tree-Code PEPC-B (Pretty Efficient Parallel Coulomb solver) into a new tool for plasma material interaction studies. After a brief overview of the working principles of Tree-Codes two main topic groups are addressed: First the leap-frog Boris integration scheme is discussed and its numerical limitations are pointed out. To overcome these limitations the method is enhanced to a guiding-center integrator. As a proof of principal, numerical experiments are conducted reproducing the anticipated drift kinetic aspects of particle orbits. It turns out that this new technique is much less sensitive to large time steps than the original concept was. One major drawback of mesh-free methods which hinders their direct use for plasma-edge simulations is the difficulty in representing solid structures and associated boundary conditions. Therefore, an alternative concept is proposed using charge carrying Wall-Particles, which fits naturally in the mesh-free doctrine. These developments incorporate the second main topic group of this report. To prove the physical correctness of this new idea, a quasi one dimensional plasma-wall interface scenario is chosen. By studying the system with great detail, good agreement between numerical findings and semi-analytical results from the literature is achieved. After that verification a broad set of physical parameters are reviewed and corresponding scenarios evaluated. Explicitly the work focuses on the ion kinetics at the sheath edge. Numerical findings in that particular region compare well to established benchmarks in the collisionless limit. Furthermore results with rotated magnetic fields are presented. In the underlying simulations the newly developed guiding-center integrator is applied. Dedicated comparisons of the findings show good agreement with former theoretical and numerical approaches. A significant strength of the self-consistent mesh-free concept is its natural capability for including close range Coulomb interactions among charged particles. In this way it is possible, to consider intrinsically collisional scenarios such as the effect of ion-ion collisions on the presheath. Additionally a new developed Monte-Carlo background-scatter-scheme is utilized to introduce charge-exchange collisions into the presheath kinetics of the ions. These last two analyses show little change in sheath-relevant quantities. So the presented results support the widely held view that a viscosity or collisional dominated presheath has little effect on the sheath itself.

  5. Fundamentos de neurocomputación

    Directory of Open Access Journals (Sweden)

    Germán J. Hernández

    1993-07-01

    Full Text Available En este documento se realiza una introducción histórica al desarrollo de la neurocomputación, se estudian los fundamentos teóricos que describen el funcionamiento de los dispositivos computacionales neuronales, llamados también Redes Neuronales Artificiales (RNA's y se menciona una gama de aplicaciones que tienen tales dispositivos en la solución de problemas en Ciencias e Ingeniería.

  6. Functional magnetic resonance imaging in neuroradiology; Funktionelle Magnetresonanztomographie in der Neuroradiologie

    Energy Technology Data Exchange (ETDEWEB)

    Essig, M.; Schoenberg, S.O.; Schlemmer, H.P.; Metzner, R.; Kaick, G. van [Deutsches Krebsforschungszentrum, Heidelberg (Germany). Forschungsschwerpunkt Radiologische Diagnostik und Therapie

    2000-10-01

    Bildgebungssequenzen, optimierter Kontrastmittelapplikationen und spezieller Nachverarbeitungsmethoden wurde es moeglich, physiologische und pathophysiologische Prozesse mittels der Magnetresonanztomographie (MRT) zu beobachten. Mit T1- und T2*-gewichteten kontrastmittelunterstuetzten Bildgebungssequenzen koennen Informationen ueber die Gewebeperfusion, Mikrozirkulation und die Permeabilitaet der Blut-Hirn-Schranke unter Anwendung spezieller, z.T. aus der Nuklearmedizin stammender Modelle erfasst werden. Die Eigendiffusion von Wassermolekuelen im Gewebe ist mit diffusiongewichteter MRT, die Markrovaskulatur, zeitlich aufgeloest, mit MR-angiographischen Techniken darstellbar. Auch eine neuronale Aktivitaet einfacher oder komplexer Natur kann mit funktionellen MR-Techniken visualisiert werden. Mit MR-spektroskopischen Untersuchungen koennen metabolische Verteilungen in normalem und pathologischem Gewebe mehrdimensional erfasst und Stoffwechselvorgaenge im Verlauf beobachtet werden. Vorteile der MRT ist die geringe Invasivitaet, die Moeglichkeit einer dreidimensionalen Darstellung der Daten und eine beliebige Wiederholbarkeit der Untersuchung bei fehlender Strahlenbelastung. Die bereits klinisch einsetzbaren funktionellen Methoden werden beschrieben und ihr Einsatz in der Neuroradiologie auch in Bezug auf die Wertigkeit im Vergleich zu nuklearmedizinischen Methoden diskutiert. Perfusions- und Diffusions-MRT liefern wichtige Zusatzinformationen im akuten und chronischen Stadium der zerebralen Ischaemie und werden bereits routinemaessig bei akutem Schlaganfall eingesetzt. Dynamische MR-Angiographien erlauben eine haemodynamische Einstufung von Gefaessmissbildungen. In der Tumordiagnostik liefern die funktionellen MR-Techniken wichtige Zusatzinformationen fuer die Therapiefindung, Therapieplanung und das Therapiemonitoring. Die Untersuchung psychiatrischen Erkrankungen wurden durch die funktionelle MRT revolutioniert, obwohl der klinische Einsatz noch limitiert ist. Erste Untersuchungen

  7. Neuro-Enhancement — klinische, soziale und ethische Dimensionen: Kognitive Leistungssteigerung in Kindheit und Jugend

    NARCIS (Netherlands)

    Nagel, S.K.; Nagel, Saskia Kathi

    2015-01-01

    Der als Neuro-Enhancement bezeichnete Einsatz meist verschreibungspflichtiger Medikamente oder Technologien zur Steigerung kognitiver Leistungen und Verbesserung affektiver Zustände bei Gesunden findet in den letzten Jahren vermehrt Anwendung. Skeptiker befürchten allerdings eine zunehmende

  8. Chemical gas sensors based on functionalized self-actuated piezo-resistive cantilevers

    OpenAIRE

    Filenko, Denys

    2008-01-01

    Der Schwerpunkt dieser Arbeit liegt in der Anwendung funktionalisierter Mikrocantilever mit integrierter bimorpher Aktuation und piezo-resistiver Detektion als chemische Gassensoren für den schnellen, tragbaren und preisgünstigen Nachweis verschiedener flüchtiger Substanzen. Besondere Beachtung erfährt die Verbesserung der Cantilever-Arbeitsleistung durch den Betrieb in speziellen Modi. Weiterer Schwerpunkt liegt in der Untersuchung von spezifischen Sorptionswechselwirkungen und Anwendung von...

  9. Use of I-123 MIBG cardiac scintigraphy to assess the impact of carvedilol on cardiac adrenergic neuronal function in childhood dilated cardiomyopathy; Interet de la scintigraphie cardiaque a l'I-123 MIBG pour evaluer l'impact du carvedilol sur la fonction neuronale adrenergique cardiaque dans les myocardiopathies dilatees de l'enfant

    Energy Technology Data Exchange (ETDEWEB)

    Maunoury, C. [Hopital Europeen Georges Pompidou (HEGP), Dept. de Physiologie et Radio-Isotopes, 75 - Paris (France); Acar, P. [Centre Hospitalier Universitaire, Service de Cardiologie Pediatrique, Hopital des Enfants, 31 - Toulouse (France); Sidi, D. [Centre Hospitalier Universitaire Necker-Enfants-Malades, 75 - Paris (France)

    2006-04-15

    I-123 MIBG cardiac scintigraphy is a useful tool to assess cardiac adrenergic neuronal function, which is impaired in children with dilated cardiomyopathy (DCM). In adults with DCM, long-term treatment with carvedilol improves both cardiac adrenergic neuronal function and left ventricular function. The aim of this prospective study was to evaluate the impact of carvedilol on cardiac adrenergic neuronal function and on left ventricular function in seventeen patients (11 female, 6 male, mean age 39 {+-} 57 months, range 1 - 168 months) with DCM. All patients underwent I-123 MIBG cardiac scintigraphy and equilibrium radio-nuclide angiography before and after a 6 month period of carvedilol therapy. A static anterior view of the chest was acquired 4 hours after intravenous injection of 20 to 75 MBq of I-123 MIBG. Cardiac neuronal uptake of I-123 MIBG was measured using the heart to mediastinum count ratio (HMR). Radionuclide left ventricular ejection fraction (LVEF) was assessed following a standard protocol. There was no major cardiac events (death or transplantation) during the follow-up period. I-123 MIBG cardiac uptake and left ventricular function respectively increased by 38% and 65% after 6 months of treatment with carvedilol (HMR 223 {+-} 49% vs 162 {+-} 26%, p < 0.0001 and LVEF = 43 {+-} 17% vs 26 {+-} 11%, p < 0.0001). Carvedilol can improve cardiac adrenergic neuronal function and left ventricular function in children with DCM. Further studies are needed to assess the relationship between improvement in I-123 MIBG cardiac uptake and the beneficial effects of carvedilol on morbidity and mortality. (authors)

  10. Modélisation en bosses pour l'analyse de motifs oscillatoires reproductibles dans l'activité de populations neuronales: applications à l'apprentissage olfactif chez l'animal et à la détection précoce de la maladie d'Alzheimer

    OpenAIRE

    Vialatte , François Benoît

    2005-01-01

    The method presented here, namely « bump modeling », provides a simple representation of time-frequency maps obtained by wavelet transformation of signals; the representation is parsimonious in terms of number of parameters. Time-frequency features can be extracted from the resulting models, which allows (i) a statistical analysis of large sets of signal recordings, and (ii) the detection of reproducible time-frequency patterns. We apply that method to the analysis of electrophysiological sig...

  11. Use of neuronal networks in the modeling of the doses that receives the Cuban population by potassium-40 contained in their organism; Utilizacion de redes neuronales en la modelacion de las dosis que recibe la poblacion cubana por el potasio-40 contenido en su organismo

    Energy Technology Data Exchange (ETDEWEB)

    Zerquera, Juan Tomas; Prendes Alonso, Miguel; Lopez Bejerano, Gladys M.; Acosta Rodriguez, Nancy [Centro de Proteccion y Higiene de las Radiaciones, La Habana (Cuba)

    2001-07-01

    The potassium 40 constitutes the main source natural present in the organism that influences in the effective dose that people receive. With the objective of evaluating the contribution from this component to the doses received by the Cuban population, a study was developed in order to evaluate the doses for this cause. A representative sample was selected based on the distribution of Cuban population by sex and ages. The measurements were carried out in the Whole Body Counter of the Center for Radiation Protection and Hygiene. For the estimate of the doses an uniform distribution of potassium was assumed in the whole body and the methodology was used recommended by the ICRP. The values of annual effective dose varies between 93 and 209 mSv for the feminine sex and 102 and 212 mSv for the masculine sex. With the obtained values they were the adjustment coefficients for the functions dose-age for each one of the sexes. At the same time it was possible to model the estimate of the doses by means of a neural network that, trained with the obtained experimental data, it allows to estimate the due doses directly to the potassium 40 starting from the sex data, age, height and corporal weight. The effective dose mediates yearly for the public's members it was estimated in 149 {+-} 6 mSv, starting from the experimental data and the Cuban population's specific characteristics. (author)

  12. Utilización de la optimización multicriterio y redes neuronales como métodos para la mejora de la calidad de las piezas obtenidas por moldeo por inyección de termoplásticos

    Directory of Open Access Journals (Sweden)

    Miguel Ángel Sellés Cantó

    2012-05-01

    Full Text Available The thermoplastic injection molding manufacturing process is the most widely used plastic manufacturing process worldwide. In order to manufacture parts with the highest quality, a methodology that modelizes that process using a neural network has been developed. The average error obtained in the model simplification is negligible, then being tested by real tests. At the same time, the input variables that are most influential in the final quality of the piece are finally determined.

  13. Prediction of daily UV-A from daily global solar irradiance using the Ktuv and Kt clearness index; Prediccion de valores diarios de radiacion solar UV-A (295-385 nm) utilizando los indices de transparencia K{sub t}uv y K{sub t} y tecnicas de resdes neuronales artificiales

    Energy Technology Data Exchange (ETDEWEB)

    Barbero, F. J.; Lopez, G.; Batlles, F. J.

    2004-07-01

    In this work we compare two methodologies in order to estimate daily UV-A from daily global solar irradiance measurements. The first one is based on standard statistical procedures for relating the daily clearness indices Ktuv and Kt and the relative air mass, whereas the second methodology is based on the novel techniques of artificial neuronal networks. In both cases, we employed data recorded at the radiometric station located at the University of Almeria between 1993 and 1996. Both models are checked against data for years not previously used. (Author)

  14. Analysis of the uranium price predicted to 24 months, implementing neural networks and the Monte Carlo method like predictive tools; Analisis del precio del uranio pronosticado a 24 meses, implementando redes neuronales y el metodo de Monte Carlo como herramientas predictivas

    Energy Technology Data Exchange (ETDEWEB)

    Esquivel E, J.; Ramirez S, J. R.; Palacios H, J. C., E-mail: jaime.esquivel@fi.uaemex.mx [ININ, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico)

    2011-11-15

    The present work shows predicted prices of the uranium, using a neural network. The importance of predicting financial indexes of an energy resource, in this case, allows establishing budgetary measures, as well as the costs of the resource to medium period. The uranium is part of the main energy generating fuels and as such, its price rebounds in the financial analyses, due to this is appealed to predictive methods to obtain an outline referent to the financial behaviour that will have in a certain time. In this study, two methodologies are used for the prediction of the uranium price: the Monte Carlo method and the neural networks. These methods allow predicting the indexes of monthly costs, for a two years period, starting from the second bimonthly of 2011. For the prediction the uranium costs are used, registered from the year 2005. (Author)

  15. Neural network design with combined backpropagation and creeping random search learning algorithms applied to the determination of retained austenite in TRIP steels; Diseno de redes neuronales con aprendizaje combinado de retropropagacion y busqueda aleatoria progresiva aplicado a la determinacion de austenita retenida en aceros TRIP

    Energy Technology Data Exchange (ETDEWEB)

    Toda-Caraballo, I.; Garcia-Mateo, C.; Capdevila, C.

    2010-07-01

    At the beginning of the decade of the nineties, the industrial interest for TRIP steels leads to a significant increase of the investigation and application in this field. In this work, the flexibility of neural networks for the modelling of complex properties is used to tackle the problem of determining the retained austenite content in TRIP-steel. Applying a combination of two learning algorithms (backpropagation and creeping-random-search) for the neural network, a model has been created that enables the prediction of retained austenite in low-Si / low-Al multiphase steels as a function of processing parameters. (Author). 34 refs.

  16. Model-based neural networks to predict emissions in a diesel engine operating with biodiesel blends of castor; Modelo basado en redes neuronales para predecir las emisiones en un motor diésel que opera con mezclas de biodiésel de higuerilla

    Directory of Open Access Journals (Sweden)

    Fabio Narváez

    2012-12-01

    Full Text Available Some identification methods of nonlinear systems using artificialneural networks are explained. Also, a model based on Neural Networks“Supervised Feed Forward” is presented, developed to identifyand predict the behavior of volumetric emissions from combustion of astationary diésel engine based on two input variables: the engine load and the mixture of castor biodiésel. The neural network training and model validation was performed by using the NNModel.

  17. artificiales

    Directory of Open Access Journals (Sweden)

    JUAN DAVID VELÁSQUEZ HENAO

    2005-01-01

    Full Text Available La construcción de modelos basados en Redes Neuronales Artificiales, no solamente comprende la parte de creación de la red neuronal como tal y su entrenamiento, si no también, una cantidad de labores que se realizan antes y después de esta fase. En el mercado existen muchas herramientas para el modelamiento de Redes Neuronales Artificiales, sin embargo, ellas no brindan la versatilidad necesaria para cumplir con estas tareas adicionales. Para satisfacer esta necesidad, se implementó el Lenguaje Algorítmico NeuroScheme, el cual incorpora los modelos de Redes Neuronales Artificiales como un tipo de dato nativo dentro del lenguaje, y que es caracterizado por su capacidad expresiva, elegancia y simplicidad.

  18. New findings for the use of NMR- and computer tomography for gauging the potential of drilling fluids to cause damage to rocks; Neue Erkenntnisse bei der Anwendung von NMR- und Computertomografie-Methoden im Rahmen der Bewertung des Traegerschaedigungspotentiales von Bohrfluessigkeiten

    Energy Technology Data Exchange (ETDEWEB)

    Zwaag, C. van der [Reservoir Labs. AS, Trondheim (Norway); Stallmach, F. [Univ. Leipzig (Germany). Fakultaet fuer Physik und Geowissenschaften; Hanssen, J.E. [MI/Anchor Drilling Fluids AS, Stavanger (Norway); Soergaard, E. [Norsk Hydro AS, Bergen (Norway); Toennesen, R. [Saga Petroleum ASA, Stavanger (Norway)

    1998-12-31

    Polyanionic cellulose, xanthane and ppolyglycole are standard additives for water-based drilling fluids. These are added to drilling liquids to control water loss, provide viscosity and inhibit slating. Filtration losses, which are unavoidable when drilling, cause scavenging polymers to penetrate the area around the drilled hole. This causes a number of different reactions with the surrounding rocks and may ultimately have a permanent influence on the flow conditions of hydrocarbons. The study mentioned above aimed at determining the damage potential of these additives. [Deutsch] Polyanionische Cellulose, Xanthan und Polyglykol sind uebliche Zusatzstoffe von wasserbasischen Bohrspuelungen. Diese werden Bohrfluessigkeiten zur Wasserverlustkontrolle, zur Viskositaetsbildung und zur Schieferinhibierung zugesetzt. Die beim Bohrprozess unvermeidlichen Filtrationsverluste fuehren dazu, dass Spuelungspolymere beim Bohren in den Bohrlochnahbereich eindringen. Die Beschaffenheit dieser Stoffe fuehrt nach dem Eindringen zu unterschiedlichen Reaktionen mit dem Traegergestein. Diese koennen letzten Endes einen dauerhaften Einfluss auf die Zuflussbedingungen von Kohlenwasserstoffen haben. Das Ziel der vorliegenden Studie war es, das Traegerschaedigungspotential der obengenannten Spuelungszusaetze zu charakterisieren. (orig.)

  19. Combined application of numerical simulation models and fission tracks analysis in order to determine the history of temperature, subsidence and lifting of sedimentary basins. A case study from the Ruhr Coal basin inWest Germany; Die kombinierte Anwendung numerischer Simulationsmodelle und Spaltspurenuntersuchungen zur Entschluesselung der Temperatur-, Subsidenz- und Hebungsgeschichte von Sedimentbecken - Ein Fallbeispiel aus dem Ruhrkohlenbecken Westdeutschlands

    Energy Technology Data Exchange (ETDEWEB)

    Karg, H. [Forschungszentrum Juelich (Germany). Inst. fuer Erdoel und organische Geochemie; Littke, R. [RWTH Aachen (Germany); Bueker, C. [Univ. Bern (Switzerland). Inst. fuer Geologie

    1998-12-31

    The Ruhr Coal basin is one of the globally best known sedimentary basins. According to classical, established the Ruhr Basin is a typical foreland molasse basins. The thermal history (heating and cooling) and the structural and sedimentary development since the formation of the basin, i.e. subsidence and lifting and erosion are of the first importance for the potential formation of hydrocarbons. In order to quantify these processes, two-dimensional numerical simulation models (based on geological and seismological sections) of the Ruhr basin were developed from which one could conclude the heat flow at the time of maximum basin depth after variscis orogenesis, maximum temperatures of individual strata sections and thickness of eroded strata. The PetroMod program package of the company IES/Juelich was used for these analyses. Finite-element-grids enable mathematican mapping and reconstruction of complex geological structures and processes. The models on temperature history are calibrated by comparing measured and calculated carbonification (vitrinite reflection) data. (orig./MSK). [Deutsch] Das Ruhrkohlenbecken stellt weltweit eines der am besten erforschten Sedimentbecken dar. Nach klassischen und etablierten Beckenmodellen kann das Ruhrbecken als typisches Vorlandmolassebecken angesehen werden. Besonders relevant fuer die potentielle Bildung von Kohlenwasserstoffen sind in erster Linie die thermische Geschichte (Aufheizung und Abkuehlung) sowie die strukturelle und sedimentaere Entwicklung seit der Beckenbildung, sprich Versenkungs-, Hebungs- und Erosionsprozesse. Um solche Prozesse zu quantifizieren, wurden im Ruhrbecken zweidimensionale (d.h. auf der Grundlage von geologischen und seismischen Sektionen) numerische Simulationsmodelle entwickelt, die Aufschluss ueber Waermefluesse zur Zeit der maximalen Beckeneintiefung im Anschluss an die variszische Orogenese, erreichte Maximaltemperaturen einzelner Schichtglieder sowie die Maechtigkeit erodierter Schichten im Becken liefern. Hierzu wurde das Programmpaket PetroMod der Firma IES/Juelich verwendet. Auf der Basis von Finite-Element-Netzen koennen komplexe geologische Strukturen und Ablaeufe mathematisch erfasst und rekonstruiert werden. Die Kalibration entwickelter Modelle zur Temperaturgeschichte wird durch den Vergleich gemessener mit berechneten Inkohlungsdaten (Vitrinitreflexion) durchgefuehrt. (orig./MSK)

  20. Synthesis and characterisation of SiC{sub f}/Cu matrix composites and their application in a divertor flat-tile mock-up; Synthese und Charakterisierung von SiC{sub f}/Cu-Matrix-Verbundwerkstoffen und ihre Anwendung in einem Modell einer Divertor-Komponente

    Energy Technology Data Exchange (ETDEWEB)

    Paffenholz, Verena

    2010-06-30

    In future fusion reactors materials are operating under extreme conditions. The fusion plasma leads to heat fluxes to the plasma facing materials (PFM) of 15-20 MW/m{sup 2} in the divertor region. To increase the thermal efficiency of future fusion power plants like DEMO, a higher coolant temperature of 300 C compared to 150 C at ITER is necessary which leads to an increased temperature of 550 C at the interface between tungsten as PFM and CuCrZr as heat sink material. This will cause high stresses as a result of the temperature gradient and the different coefficients of thermal expansion (CTE). Due to insufficient mechanical properties of the precipitation-hardened CuCrZr at this temperature, SiC{sub f}/Cu composites are considered to strengthen the critical zone with an interlayer between the PFM and the heat sink, as they combine high mechanical strength and a good thermal conductivity. The aim of this investigation is the preparation and mechanical as well as thermal characterisation (in particular the mechanical strength and thermal conductivity) of SiC{sub f}/Cu composites, and in addition, the manufacture of a metal matrix composite (MMC), as well as the assembly of a flat-tile mock-up to investigate the performance of an MMC interlayer under heat loads. A new method was developed to synthesise an appropriate MMC for the flat-tile mock-up and in addition to enable the measurement of the thermal conductivity perpendicular to fibre direction. Unidirectional (UD) layers were prepared by two subsequent electroplating processes which allow adjusting various fibre volume fractions. The UD layers were stacked with different fibre orientations (0 /0 , 0 /90 ) and consolidated by vacuum hot pressing to form a multilayer MMC. In addition, MMC specimens were prepared by hot isostatic pressing (HIP) in order to measure the mechanical properties. To improve the bonding between fibre and matrix, the fibres were coated with thin titanium (SCS6) and Ti-TaC (SCS0) interlayers. Tensile tests of MMC specimens gave information about the tensile strength at different temperatures. A higher fibre volume fraction leads to an increased tensile strength, whereas higher temperatures reduce the tensile strength. The required tensile strength of 300 MPa was obtained with a fibre volume fraction of ∝10%. At temperatures above ∝300 C tensile tests, thermo mechanical fatigue tests, and the determination of the CTE showed an increased ductility of Cu. Contrary to tensile tests at room temperature - the weak point is the layered structure of the fibre - the failure occurred at the interface between fibre and matrix at temperatures of 550 C. Thermal investigations showed the dependence of the thermal diffusivity and thermal conductivity on the fibre volume fraction, the fibre arrangement, and the fibre distance. Narrow fibre distances as well as pores and cracks due to oxide layers within the MMC, will cause thermal barriers and reduce the heat transport. High consolidation temperatures (800 C) lead to a more uniform fibre arrangement and an increased thermal conductivity. However, a high pressure at high temperatures during consolidation can cause fibre rupture, in particular for the 0 /90 fibre orientation. MMC interlayers were synthesised at a pressure of ∝40 MPa and a temperature of 650 C to assemble three flat-tile mock-ups for high heat flux tests at the facility GLADIS at IPP. The MMC consisting of 4 and 5 layers, a fibre volume fraction of 14% and a heat conductivity of ∝180 Wm{sup -1}K{sup -1} were loaded with heat loads of 0.2-10.5 MW/m{sup 2} for a duration of 30 s. Additional cyclic tests at 10.5 MW/m{sup 2} for 20 s every minute showed a high potential of SiC{sub f}/Cu up to a temperature of ∝550 C and as heat sink material in future fusion reactors. For metallographic investigations the heat flux tests were stopped after 80 cycles at 10.5 MW/m{sup 2}. Microscopic investigations showed a good bonding, few cracks and no crack propagation within the MMC which indicates a sufficient heat transport. The weak point is the bonding between the components, e.g. the brazing and the boundary area within the MMC at the edge of the mock-up. The highest stresses (residual, during heat load and after cooling) occur at the interface between tungsten and the MMC at the edge of a mock-up. In interaction with an insufficient brazing or small cracks within the MMC, high stresses can lead to distinguish cracks between the components or within the MMC which will result in an insufficient heat transport and to a local failure, followed by a loss of tungsten tiles. Hence, a good bonding between the components and within the copper matrix and the fibre matrix interface is essential for a good performance of the flat-tile mock-up.

  1. Fundamental studies on the switching in liquid nitrogen environment using vacuum switches for application in future high-temperature superconducting medium-voltage power grids; Grundsatzuntersuchungen zum Schalten in Fluessigstickstoff-Umgebung mit Vakuumschaltern zur Anwendung in zukuenftigen Hochtemperatur-Supraleitungs-Mittelspannungsnetzen

    Energy Technology Data Exchange (ETDEWEB)

    Golde, Karsten

    2016-06-24

    By means of superconducting equipment it is possible to reduce the transmission losses in distribution networks while increasing the transmission capacity. As a result even saving a superimposed voltage level would be possible, which can put higher investment costs compared to conventional equipment into perspective. For operation of superconducting systems it is necessary to integrate all equipment in the cooling circuit. This also includes switchgears. Due to cooling with liquid nitrogen, however, only vacuum switching technology comes into question. Thus, the suitability of vacuum switches is investigated in this work. For this purpose the mechanics of the interrupters is considered first. Material investigations and switching experiments at ambient temperature and in liquid nitrogen supply information on potential issues. For this purpose, a special pneumatic construction is designed, which allows tens of thousands of switching cycles. Furthermore, the electrical resistance of the interrupters is considered. Since the contact system consists almost exclusively of copper, a remaining residual resistance and appropriate thermal losses must be considered. Since they have to be cooled back, an appropriate evaluation is given taking environmental parameters into account. The dielectric strength of vacuum interrupters is considered both at ambient temperature as well as directly in liquid nitrogen. For this purpose different contact distances are set at different interrupter types. A distinction is made between internal and external dielectric strength. Conditioning and deconditioning effects are minimized by an appropriate choice of the test circuit. The current chopping and resulting overvoltages are considered to be one of the few drawbacks of vacuum switching technology. Using a practical test circuit the height of chopping current is determined and compared for different temperatures. Due to strong scattering the evaluation is done using statistical methods. At the end the short-circuit current breaking capability is investigated in liquid nitrogen. The specimens are tested in a synthetic test circuit for this purpose, loaded with an increasing current amplitude until it comes to dielectric failures. The summary of the obtained results shows that the use of vacuum switchgears in superconducting networks is possible. The vacuum interrupter performance is basically unaffected by the low temperature, so it could be used for the same ratings under liquid nitrogen as at ambient temperature.

  2. Determination of the potential for utilising combined heat and power and of the target reduction of CO{sub 2} emissions, inclusive of cost analysis (increased use of combined heat and power); Ermittlung der Potenziale fuer die Anwendung der Kraft-Waerme-Kopplung und der erzielbaren Minderung der CO{sub 2}-Emissionen einschliesslich Bewertung der Kosten (Verstaerkte Nutzung der Kraft-Waerme-Kopplung)

    Energy Technology Data Exchange (ETDEWEB)

    Horn, Manfred; Ziesing, Hans-Joachim [Deutsches Inst. fuer Wirtschaftsforschung, Berlin (Germany); Matthes, Felix Christian; Harthan, Ralph [Oeko Institut e.V., Berlin (Germany); Menzler, Gerald [VIK Verband der Industriellen Energie- und Kraftwirtschaft e.V., Essen (Germany)

    2007-07-15

    The report provides a statistical overview of CHP utilisation up to now in Germany, analyses the general economic and political conditions with a view to evaluating the competitiveness of CHP, discusses the effectiveness of the German CHP Act with respect to its contribution to meeting emissions-related goals, analyses the cost-effectiveness of investments in different types of new CHP installations, addresses mid- and longer term potential as well as impediments to the utilisation of CHP installations, presents model simulations of how CHP is expected to develop in the context of economic conditions subject to various general political conditions and makes recommendations with an eye to additional requirements and opportunities to support CHP, against the background of the findings of the analysis. (orig.)

  3. Application of the FTIR system K300 for the emission and immission measurement of atmospheric trace gases and harmful substances in the air: examples of cases and results. Anwendung des FTIR-Systems K300 zur Emissions- und Immissionsmessung atmosphaerischer Spurengase und Luftschadstoffe: Fallbeispiele und Ergebnisse

    Energy Technology Data Exchange (ETDEWEB)

    Eisenmann, T [Kayser-Threde GmbH, Muenchen (Germany); Mosebach, H [Kayser-Threde GmbH, Muenchen (Germany); Bittner, H [Kayser-Threde GmbH, Muenchen (Germany)

    1993-01-01

    The K300 double oscillation interferometer used for the investigations is a Fourier transform infrared (FTIR) spectrometer which, due to its special optical design, is very suitable for high resolution remote sensing emission and immission (long-path monitoring) measurements of harmful substances in the air and atmospheric trace gases, when used in the field. The spectrum of applications extends from the direct measurement of hot chimney waste gases and of engine exhaust gases via the monitoring of industrial plants or waste dumps (diffuse emission) to the immission measurement of sites with heavy traffic. For direct emission measurements, the infrared characteristic radiation of hot waste gases is used; for the measurement of cold diffuse emission or immission, one measures against an artificial infrared source of radiation, which can be erected at a distance of several hundred metres from the equipment (bistatic configuration, socalled long-path monitoring). The results of different applications, which were obtained in the context of various campaigns of measurements, are shown after a short introduction of the system. (orig./BBR)

  4. Use of waste fuels in cement works. Application of the 17th Ordinance for the Protection against Nuisances (BImSchV) to plants for baking cement clinkers; Einsatz von Sonderbrennstoffen in Zementwerken. Anwendung der 17. BlmSchV auf Anlagen zum Brennen von Zementklinker

    Energy Technology Data Exchange (ETDEWEB)

    Mair, K. [Bayerisches Landesamt fuer Umweltschutz, Muenchen (Germany)

    1995-06-01

    In cement works, other fuels besides the regular ones - coal, heavy fuel and natural gas - are used. Burning these materials requires proper handling and must correspond to state-of-the-art practices, especially as regards clean air measures. The ordinance on fire-places for wastes and other fuel materials (17th ordinance for the protection against nuisances) contains not only relevant emission limits but makes also stipulations as to the design of fire-places, emission monitoring, and general rules. (orig.) [Deutsch] In der Zementindustrie werden neben den sogenannten Regelbrennstoffen wie Kohle, Heizoel S und Erdgas auch Sonderbrennstoffe eingesetzt. Der Einsatz dieser Stoffe setzt jedoch eine ordnungsgemaesse Handhabung bei gleichzeitiger Einhaltung der dem Stand der Technik entsprechenden Massnahmen, besonders zur Luftreinhaltung, voraus. In der Verordnung ueber Verbrennungsanlagen fuer Abfaelle und aehnliche brennbare Stoffe (17. BlmSchV) werden hierzu neben den Emissionsbegrenzungen auch Anforderungen an die Beschaffenheit der Feuerungen, die Emissionsueberwachung sowie allgemeine Regelungen vorgegeben. (orig.)

  5. Application of fast spin-echo T[sub 2]-weighted imaging for examination of the neurocranium. Comparison with the conventional T[sub 2]-weighted spin-echo sequence. Die Anwendung der T[sub 2]-gewichteten Turbo-Spin-Echo-Sequenz zur Untersuchung des Neurokraniums. Vergleich mit der konventionellen T[sub 2]-gewichteten Spin-Echo-Sequenz

    Energy Technology Data Exchange (ETDEWEB)

    Siewert, C. (Strahlenklinik und Poliklinik, Universitaets-Klinikum Rudolf Virchow, Standort Wedding, Freie Univ. Berlin (Germany)); Hosten, N. (Strahlenklinik und Poliklinik, Universitaets-Klinikum Rudolf Virchow, Standort Wedding, Freie Univ. Berlin (Germany)); Felix, R. (Strahlenklinik und Poliklinik, Universitaets-Klinikum Rudolf Virchow, Standort Wedding, Freie Univ. Berlin (Germany))

    1994-07-01

    T[sub 2]-weighted spin-echo imaging is the standard screening procedure in MR imaging of the neutrocranium. We evaluated fast spin-echo T[sub 2]-weighted imaging (TT[sub 2]) of the neurocranium in comparison to conventional spin-echo T[sub 2]-weighted imaging (T[sub 2]). Signal-to-noise and contrast-to-noise ratio of normal brain tissues (basal ganglia, grey and white matter, CSF fluid) and different pathologies were calculated. Signal-to-noise ratio and contrast-to-noise ratio were significantly higher than TT[sub 2] than in T[sub 2] (with the exception of grey-to-white matter contrast). Tissues with increased content of water protons (mobile protons) showed the highest contrast to surrounding tissues. The increased signal intensity of fat must be given due attention in fatty lesions. Because the contrast-to-noise ratio between white matter and basal ganglia is less in TT[sub 2], Parkinson patients have to be examined by conventional T[sub 2]. If these limitations are taken into account, fast spin-echo T[sub 2]-weighted imaging is well appropriate for MR imaging of the neurocranium, resulting in heavy T[sub 2]-weighting achieved in a short acquisition time. (orig.)

  6. Intersectorial mobility as a kind of knowledge transfer between research and application. progress and motives of ''side changers''; Intersektorale Mobilitaet als Form des Wissenstransfers zwischen Forschung und Anwendung. Verlaeufe und Motive von ''Seitenwechseln''

    Energy Technology Data Exchange (ETDEWEB)

    Beckert, B.; Buehrer, S.; Lindner, R.

    2008-07-01

    The migration of scientists between public and privately funded research is generally regarded as a boon for innovation. Germany's research landscape however offers little encouragement to this end compared with other countries. Why is it that German scientists evidently switch between universities, extra-university research institutions and corporate research less often? What motives and concomitant conditions are responsible for this? What impact does switching between sectors have for the individual scientist? In an attempt to answer these questions this book presents the results of an extensive survey covering the career path of 178 scientists who were willing to switch. It pinpoints the implications for science policy that can be inferred from the identified promotive and inhibitory factors of professional mobility. The interdisciplinary research groups of the Fraunhofer Institute for Systems and Innovation Research focus on the areas of energy, environment, production, communication, biotechnology, as well as regional research and innovation policy.

  7. Die Auswahl Der Richtigen E-Commerce-Software Für Das Eigene Unternehmen - Anwendung Des AHP-Modells(Şirketiniz İçin Doğru E-Ticaret Yazılım Seçimi – AHP-Model Uygulaması

    Directory of Open Access Journals (Sweden)

    Kemal YAMAN

    2012-01-01

    Full Text Available Die Auswahl der richtigen eBusiness-Software-Lösung hat für das eBusiness-Geschäft von Unternehmen eine große Bedeutung. Das bedeutet, dass die Unternehmen eines kompetentes, effizientes, flexibles und starkes Softwarepakets bedürfen. Dafür müssen sie eine ausführliche Analyse des passenden Softwarepaketes aus dem wirtschaftlichen Aspekt ausführen. Denn eine solche Softwarelösung soll einem Unternehmen ermöglichen, ihre Produkte und Dienstleistungen problemlos online anbieten zu können. Es wird festgestellt, dass sie Auswahl solcher Softwarepakete sorgfältig durchgeführt werden müssen, da diese unterschiedliche Stärken bzw. Eigenschaften aufweisen. Zum Beispiel hat eine Lösung sehr gute Marketing-Tools, die andere jedoch Sicherheits- oder Flexibilität-Tools. Im ersten Teil der Arbeit wird auf die Bedeutung der Auswahl einer eBusiness-Lösung eingegangen und es werden dabei die relevanten Eigenschaften von Softwarelösungen sowie ihre Relevanz für den Unternehmensgeschäftserfolg geschildert. Im zweiten Teil wird der Analytic Hierarchy Process dargestellt, bei dem das Entscheidungsproblem in kleinere Teilaufgaben aufgelöst werden, die dann zu lösen sind. Schließlich werden im dritten Teil in einer abschließenden Zusammenfassung die Ergebnisse und die Schlussfolgerungen geschildert.

  8. Investigation of the epitaxial growth of Pb(Zr{sub 0,52}Ti{sub 0,48})O{sub 3} thin films and their application in ferroelectric superconducting field effect transistors; Untersuchung des epitaktischen Wachstums duenner Pb(Zr{sub 0,52}Ti{sub 0,48})O{sub 3}-Schichten und ihre Anwendung in ferroelektrischen supraleitenden Feldeffektransistoren

    Energy Technology Data Exchange (ETDEWEB)

    Aidam, R

    1999-02-01

    The influences of the polarization of ferroelectric Pb(Zr{sub 0.52}Ti{sub 0.48})O{sub 3} (PZT) films on the properties of YBa{sub 2}Cu{sub 3}O{sub x} (YBCO) films were investigated in ferroelectric superconducting field effect transistors (FSuFETs). First the epitaxial growth of PZT films deposited by reactive sputtering in an argon/oxygen atmosphere was investigated. SrTiO{sub 3} single crystals and YBCO thin films proved as suitable substrates. The lead content of the PZT films depended sensitively on the deposition temperature T{sub s} and the gas pressure. By using a high pressure of 0.26 mbar the correct stoichiometry could be achieved up to an maximum T{sub s} of 580 C. Above a minimum T{sub s} of 540 C the ferroelectric perovskite structure grew. In the optimum temperature range between 560 C and 580 C the films grew with a minimum mosaic spread of {delta}{omega} < 0.3 and a small amount of less than 1% of paraelectric phase. The best ferroelectric properties could be obtained for films with the highest degree of epitaxy and the correct stoichiometry. The maximum remanent polarization amounted P{sub r} = 61 {mu}C/cm{sup 2} and the coercive field E{sub C} was 150 kV/cm at 77 K. The breakdown field was four to five times larger than E{sub C}. Fatigue studies revealed a loss of switchable polarization of 30% after 10{sup 8} cycles at 77 K, whereas loss of retention and the effect of ageing were negligible. During the process of oxidation of the heterostructure at 400 C and an oxygen pressure of 800 mbar a reaction at the PZT/YBCO interface was observed, which lead to a degradation of the transport properties of the superconductor. This reaction could be avoided by a thin SrTiO{sub 3} buffer layer without disturbing the ferroelectric hysteresis essentially.

  9. Establishment and use of a combined test system for assessing the toxicity of environmentally relevant pollutants in soil.- Optimization of keeping conditions in the laboratory and bionomic investigations. Final report; Etablierung und Anwendung eines kombinierten Testsystems zur Beurteilung der Toxizitaet umweltrelevanter Schadstoffe in Boeden. Optimierung der Laborhaltung und bionomische Untersuchungen. Abschlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Dunger, W.; Mattern, D.; Reise, H.; Schulz, H.J.; Barth, V.; Roemer, M.; Voigtlaender, K.; Zimdars, B.

    1997-12-31

    In order to establish how organisms can be kept with low stress or free of stress in the laboratory, test species from the Oberlausitz region were chosen. The species belong to the groups of soil-living organisms Collembola, Isopoda, and Gastropoda. Keeping results may be considered as confirmed and as suitable for stress investigations. Successful optimization of keeping is only possible for a single species in each case (generalists excepted).- As applicable vital parameters both to confirm keeping success and to assess the impact of sublethal doses of stressors (heavy metals, insecticides), the following were established (in this order of sequence): reproductive success, growth (change of biomass, sloughing), mortality and, with restrictions, activity (running and foraging activity).- As expected, the effect of the heavy metals used was found to depend on their concentration. Increased mortality as a rule was only found in the wake of cadmium contaminations; reduced growth and, especially, reduced reproduction was triggered also by lead and zinc contaminations. With this regard, subtle differentiations were established. Use of Lindan in the specified dosage proved to have almost no impact during the (short) test period. (orig./MG)

  10. A method for the evaluation of a system for the disposal and use of biogenic wastes and farm manure; Vorstudie fuer eine Methode zur Bewertung der Entsorgungs- und Nutzungsverfahren von biogenen Abfaellen und Hofduenger. Entwicklung der Methodik und Anwendung auf ausgewaehlte Technologien

    Energy Technology Data Exchange (ETDEWEB)

    Baettig, M.; Klingler, G.; Dettli, R. [econcept AG, Zuerich (Switzerland); Frischknecht, R.; Tuchschmid, M. [ESU-Services Ltd., fair consulting in sustainability, Uster (Switzerland)

    2009-06-15

    This comprehensive report for the Swiss Federal Office of Energy (SFOE) deals with the evaluation of a system for the disposal and use of biogenic wastes and farm dung. The principle aim of the study was to develop a method for the evaluation of the various methods for the disposal and use of biogenic wastes and the manure produced in agriculture. A further aim was the exemplary use of the method on a selection of waste disposal methods and the drawing of initial conclusions from the ecological, economic and social points of view. The report provides details on the biomass fractions examined and their energy content. The fundamentals on which the development of the methods used are based are described. Test use of the multi-criterion analysis developed is discussed as is sensitivity analysis. Finally conclusions concerning the evaluation are presented and recommendations are made. The appendix to the report contains details on the comprehensive questionnaire used to collect information and the results of an on-line survey on the weighting of the criteria. Also, fact sheets on the 24 disposal and usage variants examined and an overview of disposal and collection costs are presented. The appendix also contains result tables on the use of the method for biogenic wastes, sewage sludge, farm manure, wood wastes and scrap wood.

  11. The implementation of the Solid Waste Management Greenhouse Gas Calculator (SWM GHG Calculator). Assessement of climate-relevant impacts by waste management measures in Turkey; Der Klimarechner Abfallwirtschaft in der praktischen Anwendung. Abschaetzung klimarelevanter Wirkungen durch die Umsetzung abfallwirtschaftlicher Massnahmen in der Tuerkei

    Energy Technology Data Exchange (ETDEWEB)

    Behnsen, Andreas [Fa. Wienecke, Hillebrecht und Partner, Ingenieurgesellschaft fuer Energiemanagement, Wolfenbuettel (Germany); Gesellschaft fuer Stoffstrom- und Abfallmanagement (GAM), Wolfenbuettel (Germany); Hillebrecht, Kai [Fa. Wienecke, Hillebrecht und Partner, Ingenieurgesellschaft fuer Energiemanagement, Wolfenbuettel (Germany); Berger, Sandra; Pino, Maria del; Arpaci, Kevin [Gesellschaft fuer Stoffstrom- und Abfallmanagement (GAM), Wolfenbuettel (Germany)

    2011-01-15

    At the beginning of this year, the introduction of the Solid Waste Management Greenhouse Gas Calculator (SWM GHG Calculator), attracted great interests in the German trade journals. Among others, the KfW development bank and the gtz refer on their web-sites to the excel tool, that enables to calculate the climatic impacts of national, regional and local waste management measures and gives an estimation regarding the costs. The calculator is based on studies of the Oeko-Institut and the ifeu, in which the German situation is described in detail and as an international example, the Turkey is presented. The calculations in this paper are founded on these studies. The estimation of experts from the KfW development bank, that 10 % to 15 % of the greenhouse gas emissions are caused by waste management activities, can be confirmed for Turkey. As executive actors in the field of waste management the municipalities have the possibility to contribute to a considerable extent to comply the targets of the Kyoto protocol. Probably this is the greatest part the state directly can contribute to the CO{sub 2}-Reduction. (orig.)

  12. Effects of chemicals on terrestrial ecosystems exhibiting different types of stability. Pt. 2. Application of fractal geometry to structural analysis in terrestrial ecotoxicology; Auswirkungen von Chemikalien auf terrestrische Oekosysteme unterschiedlichen Stabilitaetstyps. T. 2. Anwendung der fraktalen Geometrie zur Strukturanalyse in der terrestrischen Oekotoxikologie

    Energy Technology Data Exchange (ETDEWEB)

    Bornkamm, R.; Darius, F.

    1995-04-01

    The problem at issue in the present study was whether and how reactions of terrestial ecosystems to anthropogenic xenobiotics can be measured and interpreted. For this pupose test were performed on two types of vegetation which are primarily distinguishable by their reproductive strategies (via seeds and buds, respectively) and also represented by plants of different taxonomic classes. The chemicals used were two low-dosed herbicides (2.4.5-T and atrazine) which elicit responses on several important physiological levels of the plant organism. Strength and duration of responses differed considerably between the two plant systems studied. These observations gave rise to the question as to what can be said on the tested plant systems in general concerning the extent and reversibility of the effects brought about by these interventions. For this purpose the processes assumed to be acting within the biocoeonoces had to be formulated in a model and interpreted. The resultant model permits following the chain of events leading from an individual stress reaction to a complex response of the whole system. It was possible to compare various simulation results with the reactions found in tests on real ecosystems and in other cases to derive from the hypotheses capable of experimental verification. The authors believe that activities in terrestrial ecotoxicology should go beyond the gathering of data from empirical substance testing, which is undoubtedly a necessity for licensing procedures, by furthering basic research. Theoretical considerations make it seem unrealistic to attempt predictions on the future development of any certain ecosystem (whether with or without anthropogenic stress). Statements on the probability of effects, by contrast, to have a certain validty, provided they are based on a sufficient knowledge of type-specific responses of systems and of influences of background conditions. (orig.) [Deutsch] Fuer die Bearbeitung des Problems, ob und wie Reaktionen terrestrischer Oekosysteme auf anthropogene Fremdstoffe messbar und interpretationsfaehig sind, wurden zwei Vegetationstypen getestet, deren Arten sich primaer in ihrer Verbreitungsstrategie (ueber Samen bzw. ueber Knospen) unterscheiden, die hier aber auch von Pflanzen unterschiedlicher Klassen aufgebaut werden. Als Chemikalien wurden zwei niedrig dosierte Herbizide (2.4.5-T und Atrazin) verwendet, die auf vielen wichtigen Ebenen des Pflanzenorganismus Wirkungen ausloesen. Es konnten an Staerke und Dauer ganz unterschiedliche Reaktionen in den beiden Systemen beobachtet werden. Die Frage aufgrund dieser Beobachtungen war, welche generellen Aussagen sich ueber Ausmass und Reversibilitaet dieser Eingriffe bzw. Veraenderungen fuer die getesteten Systeme treffen lassen. Hierzu mussten die vermuteten Vorgaenge innerhalb der Pflanzengemeinschaften in ein Modell gefasst und interpretiert werden. Mit dem vorgestellten Modell ist es moeglich, den Weg von der individuellen Strassenreaktion zur komplexen Systemantwort nachzuverfolgen. Verschiedene Simulationsergebnisse konnten direkt mit Reaktionen getesteter realer Oekosysteme verglichen werden, oder fuehrten zu Hypothesen, die sich experimentell pruefen liessen. Im Bereich der terrestrischen Oekotoxikologie sind u.E. neben den (fuer die laufenden Zulassungsverfahren) notwendigen Datensammlungen aus empirischen Substanzpruefungen auch weitere Grundlagenforschungen wichtig. Denn eine Vorhersage ueber die konkrete Entwicklung eines bestimmten Oekosystems (mit oder ohne anthropogenem `Stess`) scheint auf Grund theoretischer Argumente wenig realistisch, bei ausreichender Kenntnis aber von typbezogenen Systemreaktionen und Einfluss von Randbedingungen koennen immerhin Aussagen ueber die Wahrscheinlichkeit von Effekten erwartet werden. (orig.)

  13. Neurale Netwerken en Radarsystemen (Neural Networks and Radar Systems)

    Science.gov (United States)

    1989-08-01

    tekenfunctie uiteraard ook andere keuzen voor f mogelijk. Indien men in pleats van slechts een "aan"- en een "uitavaarde de celtoestand met een rede getal...Classificatie van doelen met behulp van neuronale netwerken", interne publicatie div 3-3, FEL/TNO TNO rapport Pagina 149 12 B.M. Forrest, D. Roweth, N. Stroud

  14. Three-dimensional electrode array for brain slice culture

    DEFF Research Database (Denmark)

    Vazquez Rodriguez, Patricia

    Multielektroder arrays (MEA) er rækker af elektroder mest i mikrometer størrelse, som er blevet brugt i stor omfang til at stimulere og måle elektrisk aktivitet fra neuronale netværker. Brug af disse for at analysere hjerne slices (hjerneskiver) kan give indsigt i interaktioner mellem neuroner, e...

  15. Lehrbuch Guided Imagery in Music (GIM)

    DEFF Research Database (Denmark)

    Maack, Carola; Geiger, Edith Maria

    Guided Imagery in Music (GIM) ist eine musikpsychotherapeutische Methode, bei welcher der Patient eine Auswahl meist klassischer Musik in einem entspannten Zustand hört und sein Erleben (= Imaginationen) der Therapeutin mitteilt. Theoretische Hintergründe, klinische Anwendung, sowie methodenspezi......Guided Imagery in Music (GIM) ist eine musikpsychotherapeutische Methode, bei welcher der Patient eine Auswahl meist klassischer Musik in einem entspannten Zustand hört und sein Erleben (= Imaginationen) der Therapeutin mitteilt. Theoretische Hintergründe, klinische Anwendung, sowie...

  16. Composting of biological waste. Processes and utilisation; Bioabfallkompostierung. Verfahren und Verwertung

    Energy Technology Data Exchange (ETDEWEB)

    Gronauer, A.; Claassen, N.; Ebertseder, T.; Fischer, P.; Gutser, R.; Helm, M.; Popp, L.; Schoen, H.

    1997-12-31

    The project investigated environmentally compatible concepts for procesing and utilisation of biological waste by means of composting and spreading on agricultural and gardening plots. The project comprised three parts: Composting techniques, applications of compost in agriculture and gardening, and applications in landscaping. This volume comprises all three reports. (orig./SR) [Deutsch] Die umweltschonende Aufbereitung und Verwertung von Bioabfall durch Kompostierung und Rueckfuehrung auf landwirtschaftliche und gaertnerische Flaechen wurde untersucht. Dieses Projekt war dreigeteilt in die Bereiche der Kompostierung selbst, der Anwendung des Komposts in der Landwirtschaft und seiner Anwendung im Gartenbau sowie im Garten- und Landschaftsbau (GaLa-Bau). Die vorliegende Schrift enthaelt die genannten drei Teilberichte. (orig./SR)

  17. WASA-BOSS. Development and application of Severe Accident Codes. Evaluation and optimization of accident management measures. Subproject E. Improvement of the lower head model in MELCOR and calculations in connection with the FUKUSHIMA accident. Final report; WASA-BOSS. Weiterentwicklung und Anwendung von Severe Accident Codes. Bewertung und Optimierung von Stoerfallmassnahmen. Teilprojekt E. Verbesserung des Lower Head-Modelles fuer MELCOR und MELCOR-Rechnungen zu Fukushima. Schlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Kretzschmar, Frank; Dietrich, Philipp; Gabriel, Stephan; Miassoedov, Alexei

    2016-12-15

    The knowledge of the key phenomena, which govern the chronological sequence of a core melt accident, is a crucial precondition for the development of SAMGs (Severe Management Guides) to avoid and mitigate the radiological consequences for the population and the environment. In the frame of a dissertation a new model has been coupled with MELCOR, which describes the thermal interaction of a core melt with the RPV (reactor pressure vessel) wall in the lower plenum. This model allows a better description of this phenomenon. The method to couple extern programs with MELCOR had been already developed and used in a former dissertation at KIT-IKET. The model has been validated recalculating according experiments in the LIVE facility. Afterwards a defined accident scenario has been calculated for a German generic KONVOI power plant. 12 months after the start of the project a MELCOR input has been developed using data delivered by the Ruhr university of Bochum (subproject ''Simulation des Unfalls in Fukushima-Daichi zur Bewertung des Stoerfall-Analysecodes ATHLET-CD''). The results of this simulation have made a contribution to review the current understanding of the FUKUSHIMA sequence. HZDR and KIT-IKET have agreed in the course of the project, that KIT-IKET will develop a MELCOR input of a german generic KONVOI power plant following an ATHLET-CDinput of HZDR. Using this MELCOR input, a comparative analysis has been performed.

  18. WASA-BOSS. Development and application of Severe Accident Codes. Evaluation and optimization of accident management measures. Subproject F. Contributions to code validation using BWR data and to evaluation and optimization of accident management measures. Final report; WASA-BOSS. Weiterentwicklung und Anwendung von Severe Accident Codes. Bewertung und Optimierung von Stoerfallmassnahmen. Teilprojekt F. Beitraege zur Codevalidierung anhand von SWR-Daten und zur Bewertung und Optimierung von Stoerfallmassnahmen. Schlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Di Marcello, Valentino; Imke, Uwe; Sanchez Espinoza, Victor

    2016-09-15

    The exact knowledge of the transient course of events and of the dominating processes during a severe accident in a nuclear power station is a mandatory requirement to elaborate strategies and measures to minimize the radiological consequences of core melt. Two typical experiments using boiling water reactor assemblies were modelled and simulated with the severe accident simulation code ATHLET-CD. The experiments are related to the early phase of core degradation in a boiling water reactor. The results reproduce the thermal behavior and the hydrogen production due to oxidation inside the bundle until relocation of material by melting. During flooding of the overheated assembly temperatures and hydrogen oxidation are under estimated. The deviations from the experimental results can be explained by the missing model to simulate bore carbide oxidation of the control rods. On basis of a hypothetical loss of coolant accident in a typical German boiling water reactor the effectivity of flooding the partial degraded core is investigated. This measure of mitigation is efficient and prevents failure of the reactor pressure vessel if it starts before molten material is relocated into the lower plenum. Considerable amount of hydrogen is produced by oxidation of the metallic components.

  19. Joint research project WASA-BOSS: Further development and application of severe accident codes. Assessment and optimization of accident management measures. Project B: Accident analyses for pressurized water reactors with the application of the ATHLET-CD code; Verbundprojekt WASA-BOSS: Weiterentwicklung und Anwendung von Severe Accident Codes. Bewertung und Optimierung von Stoerfallmassnahmen. Teilprojekt B: Druckwasserreaktor-Stoerfallanalysen unter Verwendung des Severe-Accident-Codes ATHLET-CD

    Energy Technology Data Exchange (ETDEWEB)

    Jobst, Matthias; Kliem, Soeren; Kozmenkov, Yaroslav; Wilhelm, Polina

    2017-02-15

    Within the framework of the project an ATHLET-CD input deck for a generic German PWR of type KONVOI has been created. This input deck was applied to the simulation of severe accidents from the accident categories station blackout (SBO) and small-break loss-of-coolant accidents (SBLOCA). The complete accident transient from initial event at full power until the damage of reactor pressure vessel (RPV) is covered and all relevant severe accident phenomena are modelled: start of core heat up, fission product release, melting of fuel and absorber material, oxidation and release of hydrogen, relocation of molten material inside the core, relocation to the lower plenum, damage and failure of the RPV. The model has been applied to the analysis of preventive and mitigative accident management measures for SBO and SBLOCA transients. Therefore, the measures primary side depressurization (PSD), injection to the primary circuit by mobile pumps and for SBLOCA the delayed injection by the cold leg hydro-accumulators have been investigated and the assumptions and start criteria of these measures have been varied. The time evolutions of the transients and time margins for the initiation of additional measures have been assessed. An uncertainty and sensitivity study has been performed for the early phase of one SBO scenario with PSD (until the start of core melt). In addition to that, a code -to-code comparison between ATHLET-CD and the severe accident code MELCOR has been carried out.

  20. Numerical analysis of the bearing capacity of complex rock mechanical underground systems with filigree structures in the presence of imponderables. A contribution to the systematization of the investigative process with application/demonstration using the example of the salt cavern ASSE II/south flank; Numerische Analyse des Tragverhaltens komplexer gebirgsmechanischer untertaegiger Systeme mit filigranen Strukturen bei Anwesenheit von Imponderabilien. Ein Beitrag zur Systematisierung des Untersuchungsprozesses mit Anwendung/Demonstration am Beispiel des Salzbergwerks Schacht ASSE II/Suedflanke

    Energy Technology Data Exchange (ETDEWEB)

    Dyogtyev, Oleksandr

    2017-03-02

    The thesis dealing with the numerical analysis of the bearing capacity of complex rock mechanical underground systems with filigree structures in the presence of imponderables covers the following issues: status of science and technology, concept for the performance of numerical studies on the bearing capacity of large-volume underground systems, application example salt cavern ASSE II - application of the developed concept/development of numerical tools for the overall system/application of the global model to the given questions/realization of the modification potential.

  1. Vorgehensmodelle in Deutschland

    DEFF Research Database (Denmark)

    Kuhrmann, Marco; Linssen, Oliver

    2015-01-01

    sich die Anwendung von Vorgehensmodellen über die Zeit entwickelt hat. Die Studie hat gezeigt, dass eine Vielzahl von Vorgehensmodellen im Einsatz ist. Obwohl ein Trend weg von großen Standards zu beobachten ist, werden sowohl agile wie auch klassische Ansätze angewendet. Die Studie zeigt auch, dass...

  2. Neue Indikatoren zur Bestimmung der arithmetischen Regierungskonkordanz

    DEFF Research Database (Denmark)

    Bochsler, Daniel; Sciarini, Pascal

    2006-01-01

    auf proportionalität wird regierungskonkordanz zu einem doppelkopf: einerseits inklusivität andererseits proportionalität INTERESSANT Anwendung auf Hypothese, dass hohe Regierungskonkordanz zu häufigeren Nutzung direktdemokratischer Instrumente führt (///ich hätte es eher andersrum vermutet, aber egal...

  3. Environmental criteria for building site selection; Umweltkriterien bei der Standortsuche fuer Bauvorhaben

    Energy Technology Data Exchange (ETDEWEB)

    Locher, B [Umweltbundesamt, Berlin (Germany)

    1995-09-01

    The author of the present paper provides information on the application of ecological standards as part of the regulation of development planning. (HW) [Deutsch] Die Autorin gibt in ihrem Vortrag Hinweise auf die Anwendung von oekologischen Standards als Regelungsbestandteile fuer die Bauleitplanung. (HW)

  4. Physik gestern und heute: Visualisierung mit der Schlierenmethode

    Science.gov (United States)

    Heering, Peter

    2006-07-01

    Der Name des österreichischen Forschers Ernst Mach ist heute noch mit der Schallgeschwindigkeit verbunden. Diese Auszeichnung resultiert aus Machs Untersuchungen, wie sich Projektile mit Überschallgeschwindigkeit durch die Luft bewegen. Gerade in jüngster Zeit hat die Anwendung derartiger Methoden durch technische Modifikationen wieder einen Aufschwung erfahren.

  5. Methodenangemessene Gütekriterien in der qualitativ-interpretativen Forschung

    OpenAIRE

    Flick, Uwe

    1987-01-01

    Ziele dieses Beitrages sind Darstellung und vergleichende Diskussion verschiedener Strategien zur Absicherung von Daten und Interpretationen bei der Anwendung qualitativ-interpretativer Verfahren: Kodifizierte Vorgehensweisen bei der Interpretation, kommunikative sowie Handlungsvalidierung und schließlich die Triangulation verschiedener Methoden sollen dazu beitragen, qualitative Verfahren und ihre Resultate vom Vorwurf des Spekulativen und Beliebigen zu befreien. Mit dieser Darstellung solle...

  6. TÜV - Zertifizierungen in der Life Science Branche

    Science.gov (United States)

    Schaff, Peter; Gerbl-Rieger, Susanne; Kloth, Sabine; Schübel, Christian; Daxenberger, Andreas; Engler, Claus

    Life Sciences [1] (Lebenswissenschaften) sind ein globales Innovationsfeld mit Anwendungen der Bio- und Medizinwissenschaften, der Pharma-, Chemie-, Kosmetik- und Lebensmittelindustrie. Diese Branche zeichnet sich durch eine stark interdisziplinäre Ausrichtung aus, mit Anwendung wissenschaftlicher Erkenntnisse und Einsatz von Ausgangsstoffen aus der modernen Biologie, Chemie und Humanmedizin sowie gezielter marktwirtschaftlich orientierter Arbeit.

  7. Separate treatment of turbid water from sludge treatment; Separate Behandlung von Truebwaessern aus der Schlammbehandlung

    Energy Technology Data Exchange (ETDEWEB)

    Boehm, B.; Arnold, E.; Wilderer, P.A. [Technische Univ. Muenchen, Garching (Germany). Lehrstuhl und Pruefamt fuer Wasserguete- und Abfallwirtschaft

    1999-07-01

    In semi-technical investigations, discontinuous activated sludge processes and biofilm processes for the nitrification of sludge water were compared. Both processes were found to be equally suited for this application. (orig.) [German] In halbtechnischen Untersuchungen wurden diskontinuierlich betriebene Belebtschlamm- und Biofilmverfahren zur Nitrifikation von Schlammwaessern gegenuebergestellt. Es zeigte sich, dass beide Verfahren gleichermassen fuer diese Anwendung geeignet sind. (orig.)

  8. ELECTRICITY DEMAND FORECASTING USING A SARIMAMULTIPLICATIVE SINGLE NEURON HYBRID MODEL

    Directory of Open Access Journals (Sweden)

    JUAN DAVID VELÁSQUEZ HENAO

    2013-01-01

    Full Text Available La combinación de modelos SARIMA y redes neuronales son una aproximación común para pronosticar series de tiempo no lineales. Mientras la metodología SARIMA es usada para capturar las componentes lineales en la serie de tiempo, las redes neuronales artifi ciales son aplicadas para pronosticar las no-linealidades remanentes en los residuos del modelo SARIMA. En este artículo, se propone un modelo simple no lineal para el pronóstico de series de tiempo obtenido por la combinación de un modelo SARIMA y una neurona simple multiplicativa que usa las mismas entradas del modelo SARIMA. Para evaluar la capacidad de la nueva aproximación, la demanda mensual de electricidad en el mercado de energía de Colombia es pronosticada y comparada con los modelos SARIMA y la neurona simple multiplicativa.

  9. Control neuronal predictivo por linealización instantánea

    Directory of Open Access Journals (Sweden)

    Rosalba Lamanna

    2007-04-01

    Full Text Available Resumen: Se desarrolla un esquema de Control Predictivo Generalizado (GPC basado en un modelo neuronal del proceso, y se aplica en un reactor de neutralización de laboratorio. El modelo neuronal se obtiene previamente por identificación, y se linealiza en cada iteración del algoritmo de control. De esta manera se combina la capacidad de ajuste de la redes neuronales con la eficiencia de cálculo del GPC, consiguiéndose un sistema con las ventajas del control predictivo pero extendido a sistemas no lineales, que se comporta con precisión y rapidez ante perturbaciones. Palabras clave: Control Neuronal, Control Predictivo, Redes Neuronales, Linealización Instantánea, Control de pH

  10. Oscillation Control in a Synchronous Machine using a Neural based PSS

    Directory of Open Access Journals (Sweden)

    Sandra Milena Pérez Londoño

    2008-01-01

    Full Text Available En este artículo se presenta el diseño y la prueba en laboratorio de un estabilizador de potencia (PSS, basado en redes neuronales. La arquitectura propuesta del PSS utiliza dos redes neuronales, la primera es un controlador que efectúa un control suplementario del sistema de excitación, y una segunda red utilizada para mejorar el desempeño del controlador anterior. Para garantizar la correcta operación del PSS propuesto, éste ha sido entrenado utilizando datos obtenidos a partir de varias condiciones de operación de la máquina, y una amplia variedad de disturbios. La efectividad del método propuesto se confirma a partir de los resultados de las pruebas con máquinas síncronas utilizadas en laboratorio.

  11. DESEMPEÑO FINANCIERO DE LAS EMPRESAS: UNA PROPUESTA DE RNA // FINANCIAL PERFORMANCE OF FIRMS: A PROPOSAL FOR CLASSIFICATION ANN // DESEMPENHO FINANCEIRO DAS EMPRESAS: UMA PROPOSTA DE CLASSIFICAÇÃO POR RNA

    Directory of Open Access Journals (Sweden)

    Arturo Morales Castro

    2016-06-01

    Full Text Available Mediante el uso de redes neuronales artificiales [RNA] se propuso mejorar la precisión de clasificación de las empresas dentro de la BMV, en específico del sector comercial en comparación con las técnicas de análisis discriminante múltiple [ADM]  y los modelos logit. Se desarrollaron más de cincuenta arquitecturas neuronales, y la red neuronal artificial  que resulto fue la de arquitectura MLP 6:12:2 basada en algoritmos de aprendizaje de retro-propagación hacia atrás. Los resultados encontrados con la técnica de [RNA] arrojaron que esta técnica tiene un mejor pronóstico de evaluación y de clasificación que la obtenida por las técnicas ADM y Logit.

  12. Un modèle de l'économie comme un système des réseaux de neurones - Un contour.

    OpenAIRE

    Schulze, H. Georg

    2010-01-01

    International audience; Neuronale Netzwerken oder konnektionistische Modelle werden als konzeptionelle Bausteine ​​in der hier skizzierten ökonomischen Theorie verwendet, weil sie die gleichzeitige Modellierung von Mikro- und Makroökonomie ermöglichen. Im Zentrum der Theorie stehen zwei Netzwerke - ein Angebots- und ein Nachfrageseite-Netzwerk. Das angebotsseitige Netzwerk verwendet Land, Arbeit und Kapital als Eingaben. Die versteckte Schichtknoten, die die Hersteller repräsentiert, wandelt ...

  13. Auditorisch-räumliches Ultrakurzzeitgedächtnis und kortikale oszillatorische Aktivität

    OpenAIRE

    Walker, Florian

    2007-01-01

    Für die kortikale Verarbeitung auditorischer Sinneseindrücke werden getrennte Verarbeitungspfade für Muster-Informationen und räumliche Informationen vermutet. So sind auch an der Aufrechterhaltung solcher Informationen im auditorischen Kurzzeit- bzw. Arbeitsgedächtnis jeweils verschiedene Areale im temporo-parietalen Bereich, jedoch stets zusätzlich frontale, exekutiven Funktionen zuzuordnende Kortexareale beteiligt. Kortikale Gamma-Band-Aktivität, also Oszillationen neuronaler Netzwerke ...

  14. Paradigma. Hacia el diseño y desarrollo de algoritmos y sistemas de control para clonación artificial en procesos industriales.

    Directory of Open Access Journals (Sweden)

    Jairo Amador

    2004-11-01

    Full Text Available Haciendo uso de Ia tecnología inteligente basada en la lógica difusa, las redes neuronales y los algoritmos genéticos, se pretende plantear un paradigma para la clonación artificial de dispositivos en procesos industriales, específicamente para sensores, los cuales deberán replicar las mismas o mejores funciones de los dispositivos reales mediante la evolución des comportamiento.

  15. Copying the development: mirror neurons in child development

    Directory of Open Access Journals (Sweden)

    Demian Arturo Herrera Morban

    2016-06-01

    Full Text Available Resumen Desde la vida intrauterina nuestro cerebro está siendo expuesto a factores internos y externos que generan cambios epigenéticos que afectan las redes neuronales y por tanto modifican las propiedades de las neuronas espejo del infante en desarrollo. Consideramos que cambios en las neuronas espejo pueden jugar un papel en las patologías del neuro-desarrollo del infante donde no es observada una lesión estructural cerebral.

  16. Copying the development: mirror neurons in child development

    OpenAIRE

    Demian Arturo Herrera Morban; Nathalia Caridad Montero Cruz

    2016-01-01

    Resumen Desde la vida intrauterina nuestro cerebro está siendo expuesto a factores internos y externos que generan cambios epigenéticos que afectan las redes neuronales y por tanto modifican las propiedades de las neuronas espejo del infante en desarrollo. Consideramos que cambios en las neuronas espejo pueden jugar un papel en las patologías del neuro-desarrollo del infante donde no es observada una lesión estructural cerebral.

  17. Algoritmo de reconocimiento de patrones basado en codificación fisiológica en cerebro de primates.

    OpenAIRE

    CASTEL BAIXAULI, ALEJANDRO

    2017-01-01

    El cerebro humano y animal es capaz de reconocer una gran cantidad de patrones, como por ejemplo caras, utilizando un limitado número de neuronas y algoritmos de procesamiento [Chang et al 2017]. Sin embargo, los algoritmos de reconocimiento de patrones utilizados en la actualidad, incluso aquellos basados en redes neuronales, requieren un alto número de operaciones y capacidad de computo. El objetivo del presente trabajo final de grado es adaptar, desarrollar y validar un algoritmo de re...

  18. Aprendizaje automático

    OpenAIRE

    Moreno, Antonio

    1994-01-01

    En este libro se introducen los conceptos básicos en una de las ramas más estudiadas actualmente dentro de la inteligencia artificial: el aprendizaje automático. Se estudian temas como el aprendizaje inductivo, el razonamiento analógico, el aprendizaje basado en explicaciones, las redes neuronales, los algoritmos genéticos, el razonamiento basado en casos o las aproximaciones teóricas al aprendizaje automático.

  19. Common neuroplasticity mechanisms underlying drugs and food reward

    OpenAIRE

    Guegan, Thomas, 1983-

    2013-01-01

    La adicción a las drogas de abuso y determinados trastornos alimentarios comparten varios síntomas comportamentales. Algunos estudios han sugerido que el consumo excesivo de drogas y de comida palatable podrían producir alteraciones neuronales similares en el circuito cerebral de recompensa. En esta tesis, hemos demostrado que un aprendizaje operante prolongado con comida palatable provoca la aparición de alteraciones comportamentales y cambios de plasticidad estructurales en el circuito meso...

  20. Simulation of pendulum shock experiments on a passenger car front axle; Simulation von Pendelschlagversuchen an einer PKW-Vorderachse

    Energy Technology Data Exchange (ETDEWEB)

    Sporer, L.; Witt, R.; Muehlbauer, R. [BMW Group, Muenchen (Germany)

    2001-07-01

    The contribution describes the development and application of a method for simulating loads resulting from misuse on car body components. The development of the method and its validation by experiments are described, and its application in the development of the BMW-5 series is gone into. [German] Der Beitrag beschreibt die Entwicklung und Anwendung einer Methode zur Simulation von Missbrauchsbelastungen an Fahrwerkskomponenten. Im ersten Abschnitt ist die systematische Entstehung der Methode und die Absicherung der Simulationsergebnisse durch Ersatzversuche dargestellt. In den folgenden Abschnitten steht die Anwendung der Methode in der Fahrwerksentwicklung bei BMW am Beispiel der Vorderachse der aktuellen 5-er Baureihe im Vordergrund. Das Deformationsverhalten einzelner Lenker bzw. die Schadenskette an der gesamten Achse werden sowohl fuer den seitlichen, als auch fuer den frontalen Pendelschlag aufgezeigt. (orig.)

  1. Composting of biological waste. Processes and utilisation. Summary report; Bioabfallkompostierung. Verfahren und Verwertung. Kurzfassung

    Energy Technology Data Exchange (ETDEWEB)

    Gronauer, A.; Claassen, N.; Ebertseder, T.; Fischer, P.; Gutser, R.; Helm, M.; Popp, L.; Schoen, H.

    1997-12-31

    The project investigated environmentally compatible concepts for processing and utilisation of biological waste by means of composting and spreading on agriculataural and gardening plots. The project comprised three parts: Composting techniques, applications of compost in agriculture and gardening, and applications in landscaping. This volume comprises the summaries of the three part-projects. (orig./SR) [Deutsch] Die umweltschonende Aufbereitung und Verwertung von Bioabfall durch Kompostierung und Rueckfuehrung auf landwirtschaftliche und gaertnerische Flaechen wurde untersucht. Dieses Projekt war dreigeteilt in die Bereiche der Kompostierung selbst, der Anwendung des Komposts in der Landwirtschaft und seiner Anwendung im Gartenbau sowie im Garten- und Landschaftsbau (GaLa-Bau). Die vorliegende Schrift enthaelt die Zusammenfassung der genannten drei Teilberichte. (orig./SR)

  2. Kombinierte elektromagnetische Vollwellen- und strahlbasierte Simulationen von Fahrzeugantennen in virtuellen Testfahrten

    OpenAIRE

    Mocker-Henning, Marina

    2016-01-01

    In dieser Arbeit werden elektromagnetische Untersuchungen von Fahrzeugantennen für verschiedene Dienste in virtuellen Testfahrten unter Anwendung einer Kombination aus Vollwellen- und Ray Tracing- Methoden simulativ durchgeführt. Es werden verschiedene Vollwellen- Lösungsverfahren und -Lösermethoden vorgestellt und verglichen. Für die Berechnung der Ausbreitung elektromagnetischer Wellen im mobilen Szenario wird ein Ray Tracing Programm entwickelt, das für eine hohe Berechnungsgeschwindigkeit...

  3. Review: Anja Weiß (2001). Rassismus wider Willen. Ein anderer Blick auf eine Struktur sozialer Ungleichheit

    OpenAIRE

    Bremer, Helmut

    2002-01-01

    Die Arbeit liefert einen Beitrag zur Debatte um Rassismus und Interkulturalität sowie zur Anwendung qualitativer Forschungsverfahren im Rahmen der Theorie BOURDIEUs. Rassismus und Anti-Rassismus werden nicht isoliert betrachtet, sondern als eine Dimension sozialer Ungleichheit, die in eine umfassende Theorie sozialer Ungleichheit eingebunden werden muss. Vorgeschlagen wird BOURDIEUs Konzept von Habitus, Feld und Kapital. Das ermöglicht einen anderen Blick auf das Phänomen. Rassismus reproduzi...

  4. Konzeptionelle Entwicklung innovativer Bremssysteme

    OpenAIRE

    Schwankl, L.

    2017-01-01

    Im Rahmen des hier vorgestellten Kooperationsprojekts wurden vorhandene elektromagnetische Bremsen nach konstruktionsmethodischen Gesichtspunkten überarbeitet. Nach einer intensiven Auseinandersetzung mit dem bestehenden System wurde unter Anwendung unterschiedlichster Kreativitätstechniken eine große Anzahl von neuen Lösungsvorschlägen erarbeitet und dokumentiert. Bereits in den frühen Phasen der Produktentwicklung wurden die relevanten, produktbestimmenden Eigenschaften mittels einfacher An...

  5. Ketal-Synthese mit Brønsted-aciden ionischen Flüssigkeiten als Katalysator in zweiphasigen Reaktionssystemen

    OpenAIRE

    Thomann, Michael

    2017-01-01

    In dieser Arbeit wurde ein neuartiges Verfahren zur Produktion von 2,2-Dimethoxypropan (DMP) aus Aceton und Methanol unter Verwendung von Brønsted-aciden ionischen Flüssigkeiten (BAILs) als Katalysator in einer flüssig-flüssig Zweiphasenreaktion entwickelt. Darüber hinaus wurde die Anwendung des neuartigen Zweiphasenprozesses in der Herstellung von Ketalen aus höhermolekularen linearen Ketonen, insbesondere 2-Butanon, und Methanol demonstriert. Im Unterschied zu bisher publizierten Verfahren ...

  6. Einfluss hochfrequenter Felder des Mobilfunks auf das blutbildende System in vitro

    OpenAIRE

    Gläser, Katharina

    2017-01-01

    Elektromagnetische Felder (EMF) sind in der Umwelt des Menschen allgegenwärtig. Unter Verwendung unterschiedlicher Frequenzen bilden sie die Grundlage zahlreicher Technologien und begegnen uns im Alltag in einer Vielzahl von Anwendungen. Eine sehr wichtige Anwendung von EMF ist die mobile Kommunikation. Die hierfür verwendeten Frequenzen liegen im hochfrequenten Bereich und variieren mit dem Mobilfunkstandard. Weit verbreitet ist die GSM- und UMTS-Modulation der zweiten (2G) und dritten Gener...

  7. Do-it-yourself-Fragebogen-App am Beispiel des Fragebogens zur Erfassung des Stimmlichen Selbstkonzepts

    OpenAIRE

    Lehnert, B

    2017-01-01

    Hintergrund: Validierte Fragebögen ergänzen die Anamnese. Gegenüber der klassischen Anwendung mit Stift und Papier kann die Befragung mit mobilen Computern Vorteile haben: Erfassung, Auswertung und Dokumentation sind weniger zeit- und fehleranfällig. Durch das elektronische Interface kann unklares Antwortverhalten vermieden werden (keine Kreuzchen zwischen den Kästchen etc.). Ein Mobiltelefon kann beliebig viele Fragebögen bevorraten und passt doch in die Kitteltasche.Papierformen der Frageb...

  8. Berichte zu Pflanzenschutzmitteln 2010 Jahresbericht Pflanzenschutz-Kontrollprogramm

    CERN Document Server

    Dombrowski, Saskia

    2012-01-01

    In der Bundesrepublik Deutschland überwachen die Länderbehörden die Einhaltung der Vorschriften für das Inverkehrbringen und die Anwendung von Pflanzenschutzmitteln. 2010 wurden bundesweit 2558 Handelsbetriebe sowie 4909 land- und forstwirtschaftliche sowie Gartenbau-Betriebe kontrolliert. Darüber hinaus haben Kontrollstellen fast 100 Tausend Pflanzenschutzgeräte überprüft und die physikalischen, chemischen und technischen Eigenschaften von 157 Pflanzenschutzmitteln untersucht. Der vorliegende Bericht fasst die Ergebnisse dieser Kontrollen zusammen.

  9. Investigations on the effect of creep stress on the thermal properties of metallic materials; Untersuchungen zum Einfluss der Zeitstandbeanspruchung auf die thermischen Eigenschaften metallischer Werkstoffe

    Energy Technology Data Exchange (ETDEWEB)

    Radtke, U [Univ. Dortmund (Germany); Crostack, H A [Univ. Dortmund (Germany); Winschuh, E [Siemens KWU, Offenbach (Germany)

    1996-12-31

    Using thermal wave analysis with front side infrared detection on sample material damaged by creep, one examines whether the creep stress has an effect on the thermal material properties and to what effect this can be used to estimate the remaining service life. (orig.) [Deutsch] Unter Anwendung der Waermewellenanalyse mit frontseitiger Infrarotdetektion auf zeitstandgeschaedigtes Probenmaterial wird untersucht, ob die Zeitstandbeanspruchung einen Einfluss auf die thermischen Werkstoffeigenschaften hat und inwieweit dieser zur Abschaetzung der Restlebensdauer genutzt werden kann. (orig.)

  10. The new radiation protection ordinance from the viewpoint of the researcher in nuclear medicine; Die neue Strahlenschutzverordnung aus der Sicht des in der Forschung taetigen Nuklearmediziners

    Energy Technology Data Exchange (ETDEWEB)

    Reiners, Chr.; Lassmann, M. [Klinik und Poliklinik fuer Nuklearmedizin der Univ. Wuerzburg (Germany)

    2002-05-01

    After the new radiation protection ordinance has come into effect with July 20th, 2001 the approval process for application of radiation substances or ionizing radiation in medical research changed considerably with respect to the responsibility of the Federal Office for Radiation Protection as the approval authority, the participation of an approved ethic committee, the inclusion of an expert for medical physics for planning and execution of the study as well as stricter regulations for cover clause. On the contrary, existing regulations have been facilitated since the effective dose limit for volunteers has been increased from 10 to 20 mSv and a central procedure for approval of multicenter studies has been introduced. Moreover, the application of radioactive substances or ionizing radiation for research in people without or with restricted legal capacity is no more totally prohibited. At present, changes of the radiation protection ordinance and the atomic law cover clause ordinance with respect to medical research are in discussion. (orig.) [German] Nach In-Kraft-Treten der neuen Strahlenschutzverordnung vom 20.07.2001 ergeben sich wesentliche Aenderungen des Genehmigungsverfahrens fuer die Anwendung radioaktiver Stoffe oder ionisierender Strahlung in der medizinischen Forschung bezueglich der Zustaendligkeit des Bundesamts fuer Strahlenschutz als Genehmigungsbehoerde, der Einschaltung einer akkreditierten Ethikkommission, der Hinzuziehung eines Medizinphysik-Experten bei der Studien-Planung und -Anwendung sowie verschaerfter Regelungen zur Deckungsvorsorge. Eine gewisse Erleichterung bisher bestehender Regelungen ist in der Erhoehung des Grenzwerts der effektiven Dosis fuer Probanden von 10 auf 20 mSv sowie dem zentralen Genehmigungsverfahren fuer Multizenter-Studien zu sehen. Ausserdem ist eine Anwendung radioaktiver Stoffe oder ionisierender Strahlung in der Forschung an geschaeftsunfaehigen und beschraenkt geschaeftsfaehigen Probanden nicht mehr voellig

  11. Generative Fertigung im Maschinenbau - industrieller 3D-Druck auf dem Weg in die Serienproduktion

    OpenAIRE

    Müller, Bernhard

    2014-01-01

    3D-Druck ist aktuell medial omnipräsent, sein Potential für echte industrielle Anwendungen, v. a. im Maschinenbauumfeld, wird kontrovers diskutiert. Der Vortrag gibt einen fundierten Einblick in den Stand der Technik zum industriellen 3D-Druck (Generative Fertigung , Additive Manufacturing) und zeigt spezifische Potentiale mit industrieller Relevanz auf. Dabei werden ebenso Praxisbeispiele aus heutiger Anwendung in der Industrie gezeigt als auch Zukunftsszenarien für potentielle Anwendungen e...

  12. Bestimmung der optimalen Array-Apertur für die Ultraschallprüfung von faserverstärkten Kunststoffen

    OpenAIRE

    Kurras, Martin

    2017-01-01

    Für die zerstörungsfreie Prüfung von Kohlenstofffaserverbundwerkstoffen (CFK) wird häufig die Ultraschallprüfung verwendet. Neben dem klassischen Ultraschallverfahren findet dabei auch die Phased Array Technologie Anwendung. Hierbei wird zwischen zwei Verfahren unterschieden: dem handelsüblichen Phased Array oder Conventional Phased Array (CPA) und dem tomographischen Sampling Phased Array (SPA). Der Einsatz von Phased Arrays im Zusammenhang mit Linear-Scan-Technik und das sich daraus ergeben...

  13. Geschäftsmodelle in der digitalen Wirtschaft. Vollstudie

    OpenAIRE

    Müller, Simon C.; Böhm, Markus; Schröer, Marina; Bahkirev, Alexander; Baiasu, Bogdan-Cristian; Krcmar, Helmut; Welpe, Isabell M.

    2016-01-01

    Selten zuvor haben neuartige Konzepte und Technologien überall auf der Welt so schnell und weitreichend gesellschaftliche und wirtschaftliche Anwendung gefunden wie digitale Geschäftsmodelle und Smartphones in den letzten zehn Jahren. Meilensteine der Entwicklung waren der Beginn der Digitalisierung ganzer Bibliotheken beginnend mit dem Jahr 2005 und die Markteinführung des iPhones im Jahr 2007. Die digitale Transformation stellt Politik und Wirtschaft vor große Herausforderungen. Für eine fu...

  14. Introduction of a Diagnosis Related Groups’ Case Flat Rate System: Hopes and Fears (einfuerhrng eines drg-fallpauschalensystems - hoffnungen und aengste)

    Science.gov (United States)

    2000-06-01

    Anwendung und Pflege des neuen Systems dienen soil, wenn die entscheidenden Vorgaben bereits durch die Deckelung gegeben sind. Oder denkt man an den...Software und die da- mit verbundenen Lizenzgebuhren, sondern auch in der Folge um die Schulung der Mitarbeiter sowie die Pflege und Weiterentwicklung...sung an die medizinische Entwicklung" sowie von "Verfahren zur laufen- den Pflege des VergOtungssystems" gesprochen. Es mossen jedoch klare

  15. Trennung und Rekombination von Ladungsträgern in Solarzellen mit nanostrukturierter ZnO-Elektrode

    OpenAIRE

    Tornow, Julian

    2010-01-01

    In dieser Arbeit werden Elektroden aus hydrothermal auf leitfähigem Glassubstrat (Leitglas) abgeschiedenen ZnO-Nanostangen betrachtet. Die Elektroden selbst sind für sichtbares Licht transparent und werden für eine Anwendung als Solarzelle mit einer lichtabsorbierenden Schicht sensibilisiert; hier sind das entweder metallorganische Farbstoffmoleküle (N3) oder eine nur wenige Nanometer dicke Schicht aus Indiumsulfid. Für die elektrische Kontaktierung der sensibilisierten Elektrode wird entwed...

  16. Ein Richdata-Konzept für Virtuelle Realität dargestellt am Beispiel der Fahrzeugkonfiguration

    OpenAIRE

    Ni, Cheng

    2011-01-01

    Die Integration ist einer der wichtigsten Erfolgsfaktoren für den VR-Einsatz im industriellen Entwicklungs- und Produktionsprozess. Ausgereifte integrierte VR-Lösungen benötigen vielfältige Informationsformen, um neben der visuellen Szene auch die Beschreibung, Logik, Überwachung und Kontrollierbarkeit des zu integrierenden Prozesses in der VR-Anwendung darzustellen. In VR wurden sie allerdings bisher nicht in der gleichen Intensität wie die Erzeugung, Verarbeitung und Anzeige von Geometrieda...

  17. Vergleichende Kraft-Dehnungs- und Dauerlastversuche mit kieferorthopädischen Gummizügen und pseudoelastischen Ni-Ti-Federn

    OpenAIRE

    Buch, Stefan

    2003-01-01

    Bei einer Behandlung mit festsitzenden Apparaturen stehen für Zahnverschiebungen in mesio-distaler Richtung und zur Okklusionseinstellung seit 1993 als Alternative zu Gummiringen aus Latex Zugfedern aus der Nickel-Titan-Legierung Sentalloy zur Verfügung. Die vorliegende Untersuchung zeigt die materialtechnischen Besonderheiten der beiden Werkstoffe auf und beschreibt die Vor- und Nachteile in der klinischen Anwendung der Gummizüge und der Federn. Es wurden Gummizüge aus Latex von Ormco Dental...

  18. Experten-Statement Souvenaid®: Ein diätetisches Lebensmittel in der Behandlung der frühen Alzheimer-Krankheit

    OpenAIRE

    Winkler A; Bach D; Croy A; Fasching P; Gatterer G; Marksteiner J; Monsch A; Pils K; Rainer M; Roller-Wirnsberger R; Schneeberger A; Zellner M

    2013-01-01

    In der medizinisch-wissenschaftlichen Literatur finden sich klare Hinweise dafür, dass sowohl die Zahl als auch die Funktion neuronaler Synapsen gedächtnisrelevanter zerebraler Areale bereits in frühen Stadien der Alzheimer-Krankheit (AK) reduziert sind. Darüber hinaus gibt es fundierte Belege dafür, dass Patienten mit AK spezielle Ernährungsbedürfnisse haben und eine Substitution spezifischer Nährstoffe dem Verlust von Synapsen und ihrer Funktion entgegenwirken könnte. Während bislang verfüg...

  19. Hermenéutica de los lugares: Nueve principios y un epílogo

    Directory of Open Access Journals (Sweden)

    Xavier Laborda

    2006-05-01

    Full Text Available La memoria sí ocupa lugar, puesto que la memoria pide y tiene un espacio y, también, un radica en ese hacer social tiempo. El refrán que vocea lo contrario expresa una falacia. No se trata del lugar de almacenamiento, de las celdillas neuronales ni de la red de sinapsis, sino del espacio exterior que da ocasión a la invención de todo saber.

  20. Funciones de la proteína priónica celular, alfa-sinucleína y reelina en enfermedades neurodegenerativas

    OpenAIRE

    Urrea Zazurca, Laura

    2018-01-01

    Las enfermedades neurodegenerativas son una serie de trastornos del sistema nervioso caracterizadas por la pérdida de grupos neuronales específicos y por la presencia de cuerpos de inclusión proteicos, entre ellas las más frecuentes son la enfermedad de Alzheimer y la enfermedad de Parkinson, ambas asociadas a la edad. Su etiología, en la mayoría de los casos, aún se desconoce y su manifestación clínica es progresiva y crónica. La enfermedad de Parkinson se caracteriza por la pérdida de ne...

  1. Papel de la plasticidad cerebral en las alteraciones del neurodesarrollo: autismo y retraso mental

    OpenAIRE

    Miranda García, Rubén

    2014-01-01

    La plasticidad cerebral es la propiedad que permite al cerebro adaptarse a las condiciones cambiantes del ambiente y de la experiencia, y es el mecanismo que permite su readaptación o reparación ante lesiones. Tal flexibilidad del cerebro puede expresarse tanto a nivel celular, incluyendo procesos de neurogénesis, como o a nivel sináptico, implicando cambios en la estructura y función de las conexiones neuronales. Numerosos trastornos del neurodesarrollo, inducidos por distintas mutaciones ge...

  2. Editorial

    OpenAIRE

    JIMÉNEZ BUILES, JOVANI ALBERTO

    2011-01-01

    Estimados lectores, En este número de la revista Avances en Sistemas e Informática tengo el agrado de presentarles veintiséis artículos arbitrados, de investigaciones recientes. Los autores de los artículos pertenecen a reconocidas universidades y centros de investigación de: Argentina, Chile, México, España, Venezuela y Colombia. Los artículos se enmarcan dentro de las temáticas de: redes neuronales, comercio electrónico, ingeniería de software, computación distribuida, sistemas multiagente,...

  3. Hermenéutica de los lugares: Nueve principios y un epílogo

    OpenAIRE

    Xavier Laborda

    2006-01-01

    La memoria sí ocupa lugar, puesto que la memoria pide y tiene un espacio y, también, un radica en ese hacer social tiempo. El refrán que vocea lo contrario expresa una falacia. No se trata del lugar de almacenamiento, de las celdillas neuronales ni de la red de sinapsis, sino del espacio exterior que da ocasión a la invención de todo saber.

  4. ESTIMACIÓN DE LA CARGA DE TRANSFORMADORES DE POTENCIA UTILIZANDO UNA RED NEURONAL ARTIFICIAL

    OpenAIRE

    Agudelo, Laura; Velilla, Esteban; López, Jesús M

    2014-01-01

    En este artículo se presenta una metodología para estimar la curva de carga de transformadores de potencia utilizando redes neuronales artificiales. Para implementar la metodología propuesta se utilizaron datos reales de dos transformadores ubicados en diferentes zonas geográficas y con diferentes condiciones de operación. La técnica de estimación de carga fue implementada con datos históricos de la empresa Interconexión Eléctrica S.A (ISA). Para realizar la predicción de las curvas de carga ...

  5. Fundamentos de computación con ADN

    Directory of Open Access Journals (Sweden)

    Jorge Eduardo Ortíz Triviño

    1998-05-01

    Full Text Available Este artículo presenta algunas ideas básicas para resolver problemas computacionales complejos, mediante el empleo de la estructura biológica del ADN y técnicas especializadas de laboratorio. Las características del ADN que se describen hacen posible codificar estructuras matemáticas, como las máquinas de Turing o las redes neuronales; para ello, la clave está en la interpretación del ADN como un generador de lenguajes.

  6. Optimization and control of feb-batch fermentation processes by using artificial neural systems

    OpenAIRE

    Valencia Peroni, Catalina

    2002-01-01

    Optimización y Control de Procesos de Fermentación Fed-batch a través de Sistemas Neuronales ArtificialesLos procesos de fermentación son ampliamente utilizados en la industria química, farmacéutica y alimentaria. La producción de comida para animales, yogures, quesos, cerveza, colorantes para comida, fertilizantes, medicinas terapéuticas y penicilina, entre otros, son algunos ejemplos de procesos biotecnológicos. En una búsqueda rápida en Internet, cerca de 113000 sitios fueron encontrados, ...

  7. Un modelo neuronal basado en la metaplasticidad para la clasificación de objetos en señales 1-d y 2-d

    OpenAIRE

    Marcano Cedeño, Alexis Enrique

    2010-01-01

    El Algoritmo de Retropropagación (Algoritmo Backpropagation, ABP), es uno de los algoritmos más conocidos y utilizados para el entrenamiento de las Redes Neuronales Artificiales, RNAs. El ABP ha sido empleado con éxito en problemas de clasificación de patrones en áreas como: Medicina, Bioinformática, Telecomunicaciones, Banca, Predicciones Climatológicas, etc. Sin embargo el ABP tiene algunas limitaciones que le impiden alcanzar un nivel óptimo de eficiencia (problemas de lentitud, convergenc...

  8. La Inteligencia Artificial aplicada a la toma de decisiones en la Empresa de Internet

    Directory of Open Access Journals (Sweden)

    Mª Carmen Lozano Gutiérrez

    2004-09-01

    Full Text Available En el presente documento de trabajo se presenta una aplicación de una metodología basada en distintas técnicas de Inteligencia Artificial (redes neuronales, lógica difusa, así como técnicas bio-inspiradas basadas en el comportamiento de las hormigas al proceso de toma de decisiones de la empresa en red, para la consecución de un objetivo concreto como es el de lograr la maximización de los enlaces recorridos así como el logro de una óptima usabilidad del sitio.

  9. Neurología de la anticipación y sus implicaciones en el deporte

    Directory of Open Access Journals (Sweden)

    Juan Felipe Correa Mesa

    2016-01-01

    Por otro lado, se aborda la integración de centros puntuales del sistema nervioso central y redes neuronales que permiten el entramado de procesos de aprendizaje por observación, además de proveer equilibrio y eficiencia al sistema en la recepción de estímulos y su relación con la generación de eferencias motoras que cumplan con objetivos específicos. En el ámbito deportivo estos procesos favorecen la eficiencia del gesto optimizando el movimiento.

  10. Mood and quality of life among people with progressive neurological illnesses

    OpenAIRE

    Marita P. McCabe; Lucy Firth; Elodie O´Connor

    2009-01-01

    El presente estudio ex post facto fue diseñado para examinar el estado de ánimo y la calidad de vida (QQL) entre 423 personas con enfermedad neurológica progresiva. En particular, se ha investigado la relación entre las variables de la enfermedad y el estado de ánimo y calidad de vida de 120 personas con enfermedad de la neuronales motoras (MND), 48 con enfermedad de Huntington (HD), 143 con Parkinson y 112 con esclerosis múltiple (MS). Los resultados demostraron que las personas con HD co...

  11. Control inteligente de sistemas e iluminación en edificios

    OpenAIRE

    Huamán Rojas, Jezzy James

    2017-01-01

    La tesis desarrolla un controlador adaptativo para el control inteligente de la iluminación en cualquier ambiente, esto considera edificios, casas, oficinas, entre otros. Se presentan dos opciones de controlador y, para considerarlo un sistema inteligente, este se adapta al usuario haciendo uso de la tecnología de aprendizaje automático y regulable. Redes neuronales artificiales y árboles de decisión se emplean para adecuar la iluminación sin dejar de cumplir las normas que se establecen por ...

  12. La neurociencia aplicada al estudio del género: ¿una nueva perspectiva?

    OpenAIRE

    Pallarés Domínguez, Daniel Vicente

    2011-01-01

    Setzenes Jornades de Foment de la Investigació (Any 2011) La neurociencia es a día de hoy una ciencia experimental que va conformando su sentido y modificando las disciplinas en las que influye. Como método científico utiliza todas las herramientas posibles para explicar el funcionamiento cerebral humano sobre todo, y lo estudia desde el parámetro de los estímulos y reacciones innatas con los que crea circuitos neuronales, ayudando a los seres humanos a tomar decisiones...

  13. Sistema neuronal difuso para la gestión de documentos estructurados

    OpenAIRE

    Sainz Palmero, Gregorio Ismael; Cano Izquierdo, José Manuel; López Coronado, Juan; Dimitriadis Damoulis, Yannis

    1995-01-01

    En la presente comunicación se presenta el problema de la gestión automatizada de documentos electrónicos desde un doble punto de vista: normalización y reconocimiento-clasificación. Se propone un sistema que aborda estos problemas mediante la utilización, por un lado, de la arquitectura de documentos de la norma ODA/ODIF (ISO8613) y, por otro, de redes neuronales, Fuzzy ARTMAP, para la clasificación del documento y sus componentes.

  14. Dinámica neuronal del circuito motor: un estudio de resonancia magnética funcional

    OpenAIRE

    Batista García-Ramó, Karla; Rodríguez Rojas, Rafael; Carballo Barreda, Maylén

    2012-01-01

    La modelación de redes neuronales que describan la interacción funcional del circuito cerebral formado por los ganglios basales (GB), el tálamo y la corteza está limitada por las simplificaciones necesarias para reproducir sus propiedades biológicas. Este trabajo tiene como objetivo general modelar el circuito GB-tálamo-corteza para la selección de un programa motor, sobre la base del patrón de conectividad funcional obtenido por imágenes de resonancia magnética nuclear funcional (RMNf). Se i...

  15. Seminario internacional “neurociencias y la investigación del sueño” productividad y desempeño en todas las especies animales asociada al sueño volumen

    OpenAIRE

    Rojas, Manuel

    2010-01-01

    Las neurociencias agrupan un amplio espectro de tópicos de investigación en aéreas básicas y clínicas. El estudio del sistema nervioso ha aportado en las últimas décadas información trascendental que permite a la ciencia entender algunos de los circuitos, mecanismos y funciones neuronales que regulan, modulan e inducen diferentes estados de sueño. En los mamíferos es absolutamente evidente la presencia de ciclos que alternan estados de vigilia y de sueño, tanto así que la mayoría de estas esp...

  16. Therapeutic Effect of Exosomes on Ischemic Stroke in Experimental Animals

    OpenAIRE

    Carvallo, P; Astudillo, P

    2016-01-01

    La posibilidad de que los exosomas funcionen como una nueva forma de comunicación intercelular para establecer y mantener circuitos cerebrales está comenzando a ser explorada. Los exosomas son liberados desde células e interactúan con otras células receptoras para mediar cambios fisiológicos. Todas las células cerebrales liberan exosomas incluyendo las celulas madre neuronales, las neuronas, astrocitos, microglia, oligodendrocitos y las celulas endoteliales. El objetivo de esta revisión es re...

  17. Perspectivas y experiencias creativas para estudiantes universitarios

    OpenAIRE

    Donolo, Danilo; Rinaudo, María C.

    2008-01-01

    La propuesta recoje cinco pespectivas sobre la creatividad en ambientes de educación superior realizadas en el marco de un proyecto de investigación en los últimos tres años. Un primer aspecto tiene que ver con la construcción del conocimiento y la creatividad; el segundo presenta el reclamo de liderazgo creativo. Luego los avances de la neuropsicología nos permiten unos párrafos sobre redes neuronales a favor de la creatividad. Cierran la presentación dos aportes, uno más académico: presenci...

  18. Fisiopatología de la caquexia neoplásica Pathophysiology of neoplasic cachexia

    OpenAIRE

    J. M. Argilés; S. Busquets; F. J. López-Soriano; M. Figueras

    2006-01-01

    La regulación del apetito y de los patrones alimenticios está mediada por diferentes factores psicológicos, gastrointestinales, metabólicos y nutricionales, así como por distintos mecanismos neuronales y endocrinos. El paciente canceroso anoréxico experimenta una sensación precoz de saciedad y una disminución del apetito. En algunas ocasiones, las causas de esta anorexia pueden derivarse del propio tratamiento anticanceroso (quimioterapia, radioterapia o inmunoterapia), que pueden inducir náu...

  19. El lenguaje del cerebro

    Directory of Open Access Journals (Sweden)

    Antonio Ibáñez Molina

    2011-04-01

    Full Text Available La introducción de nuevas técnicas de análisis de ritmos EEG en estudio de la comprensión del lenguaje permite explorar esta habilidad humana desde una perspectiva de integración de grupos de redes neuronales. Los ritmos de disparo neuronal que generan estos grupos pueden conectarse por sincronía formando unidades funcionales transitorias distribuidas en diversas áreas del cerebro. En esta revisión comentamos algunos de estos ritmos y su relación con el lenguaje.

  20. Real-Time software technology and its use in experimental neuroscience

    OpenAIRE

    Amaducci Szwarc, Rodrigo Vicente

    2017-01-01

    Debido a las complicadas dinámicas no lineales de los sistemas neuronales así como a la incapacidad existente a la hora de observar más de unas pocas de las señales que participan en dichas dinámicas de forma simultánea, el estudio de estos sistemas es muy complejo. Además, el paradigma tradicional de trabajo es el de estímulo-respuesta, en el cual se registra el comportamiento del sistema al responder a ciertos estímulos de entrada y se estudian estos resultados a posteriori, ...

  1. Desarrollo de un sistema basado en la visión artificial para el reconocimiento de placas vehiculares

    OpenAIRE

    Suárez Pino, José Antonio; Suárez Pino, José Antonio; Suárez Pino, José Antonio

    2011-01-01

    El presente trabajo describe el desarrollo del sistema de reconocimiento de placas vehiculares basado en visión artificial. En primer lugar, la placa es detectada dentro de la imagen digital usando las características de ancho, altura y área de los objetos que hay en la imagen. Después de ubicar la placa, los caracteres son extraídos de la imagen uno a uno. Finalmente, cada carácter es reconocido usando el algoritmo de redes neuronales artificial. Las pruebas de reconocimiento se realizaron t...

  2. Reconocimiento automa?tico a trave?s de visio?n artificial, correlacio?n estadi?stica y Matlab aplicado a las matri?culas de vehi?culos

    OpenAIRE

    Barcia, Orlando

    2014-01-01

    Existen muchas investigaciones sobre el reconocimiento de caracteres e ima?genes utilizando diferentes me?todos tales como redes neuronales, me?todos estructurales, basados en la apariencia y otros (Pajares Martinsanz & De La Cruz Garci?a, 2008a). El problema es el reconocimiento automa?tico de caracteres en las placas o matri?culas de los vehi?culos del Ecuador. El trabajo innova en la aplicacio?n de las te?cnicas de visio?n artificial, adaptando el reconocimiento de las matri?culas de los v...

  3. Los determinantes de la orientación exportadora y los resultados en las pymes exportadoras en Colombia

    OpenAIRE

    Diana Marcela Escandón Barbosa; Andrea Hurtado Ayala

    2014-01-01

    Partiendo del concepto de orientación al mercado definido en el campo del marketing internacional, este artículo analiza los factores determinantes de la orientación exportadora y su influencia en los resulta- dos empresariales de las pymes exportadoras en Colombia. A partir de una encuesta realizada en 2011 a 297 pymes manufactureras colombianas, se estima un modelo de redes neuronales tipo perceptrón mul- ticapa para establecer la importancia de los determinantes de la orientación exportado...

  4. Predicción de demanda eléctrica en edificios

    OpenAIRE

    Ollé López, Guillem

    2015-01-01

    La finalidad del presente proyecto consiste en exponer una serie de herramientas basadas en nuevas tecnologías computacionales para la predicción de la demanda eléctrico en edificios. Estas nuevas tecnologías computacionales se denominan redes neuronales artificiales y se basan en algoritmos muy potentes para relacionar grandes cantidades de información y, de esta manera construir modelos matemáticos muy complejos que puedan, en este caso, predecir valores. Para poder tene...

  5. Mechanisms responsible of sensory afferent projections into the hindbrain

    OpenAIRE

    Zecca, Andrea, 1985-

    2014-01-01

    Los animales perciben el mundo externo a través de los sistemas sensoriales. Estos consisten en: i) los receptores sensoriales que detectan estímulos externos; ii) las vías neuronales que transmiten la información sensorial al cerebro; y iii) las neuronas centrales organizadas en núcleos que procesan la información. Con el objetivo de estudiar la inervación selectiva de las regiones del rombencéfalo por las aferentes sensoriales, hemos mapado la representación topográfica de las proyecciones ...

  6. Estudio experimental sobre comportamientos reactivos - evolutivos en navegación de robots móviles

    OpenAIRE

    Fernández León, José A.; Tosini, Marcelo Alejandro; Acosta, Nelson; Acosta, Gerardo

    2005-01-01

    En este trabajo se analiza la navegación y la evasión de obstáculos para robots móviles en un ambiente no conocido, estático y simulado. A partir de la lectura de los sensores de proximidad, los controladores basados en Redes Neuronales Artificiales (RNA) establecen la trayectoria deseada entre la posición actual y la posición objetivo. Algoritmos Evolutivos son usados en la selección del mejor controlador. Esta metodología de trabajo, es conocida como Robótica Evolutiva (RE), comúnmente util...

  7. Cerebral activation studies by PET and fMRT, clinical relevance?; Zerebrale Aktivierungsstudien mit PET und fMRT, klinische Relevanz?

    Energy Technology Data Exchange (ETDEWEB)

    Brandt, T. [Neurologische Klinik und Poliklinik, Klinikum Grosshadern, Muenchen Univ. (Germany)

    1997-03-01

    Cerebral activation studies by PET and fMRT will gain increasing clinical relevance for functional neuroanatomy (reading, speaking), localisation of largely unknown cortical functions (vestibular cortex), imaging of subjective complaints of functional impairments (pain, smell, memory), and documentation of neurological rehabilitation at neuronal level (regeneration, compensation, substitution, learning). (orig.) [Deutsch] Zerebrale Aktivierungsstudien mit PET und fMRT erlangen zunehmend klinische Bedeutung fuer die funktionelle Neuroanatomie einzelner und komplexer Hirnleistungen (Lesen, Sprechen), die Lokalisation bislang unzureichend erforschter Hirnfunktionen (vestibulaerer Kortex), die Objektivierung subjektiver Beschwerden und Funktionsausfaelle (Schmerz, Riechen, Gedaechtnis) und die Dokumentation neurologischer Rehabilitation auf neuronaler Ebene (Regeneration, Kompensation, Substitution, Lernen). (orig.)

  8. Estructura y ultraestructura del techo óptico de la carpa "Cyprinus carpio"

    OpenAIRE

    Lara Prada, Juan Manuel

    1981-01-01

    Se describen tres factores que determinan la laminación tectal (densidad mieliníca y neuronal y trayectoria de las prolongaciones). Observamos siete estratos y describimos la estructura general de cada uno de ellos así como los tipos ne ... uronales y componentes smápticos tanto a nivel óptico como ultraestructural. Así mismo describimos las componentes no neuronales de la estructura tectal tanto gliales como no gliales.Un ligero repaso de la anatomía comparada del sistema nervioso central...

  9. La atorvastatina protege las neuronas gabérgicas y dopaminérgicas del sistema nigroestriatal en un modelo experimental de isquemia cerebral focal transitoria en ratas

    OpenAIRE

    Angélica María Sabogal; Cesar Augusto Arango; Gloria Patricia Cardona; Ángel Enrique Céspedes

    2014-01-01

    Introducción. La isquemia cerebral es la tercera causa de muerte y la primera de discapacidad permanente en el mundo. La atorvastatina es un fármaco neuroprotector prometedor para el tratamiento de la apoplejía; sin embargo, su acción sobre las poblaciones neuronales del sistema nigroestriatal después de la isquemia aún se desconoce. Objetivo. Evaluar el efecto de la atorvastatina sobre poblaciones gabérgicas y dopaminérgicas en regiones exofocales en un modelo de oclusión transitoria de ...

  10. Functional and effective connectivity in MEG. Application to the study of epilepsy

    OpenAIRE

    Niso Galán, Julia Guiomar

    2013-01-01

    Nuestro cerebro contiene cerca de 1014 sinapsis neuronales. Esta enorme cantidad de conexiones proporciona un entorno ideal donde distintos grupos de neuronas se sincronizan transitoriamente para provocar la aparición de funciones cognitivas, como la percepción, el aprendizaje o el pensamiento. Comprender la organización de esta compleja red cerebral en base a datos neurofisiológicos, representa uno de los desafíos más importantes y emocionantes en el campo de la neurociencia. Se han propuest...

  11. Alteraciones de la conectividad funcional en la esquizofrenia

    OpenAIRE

    Rodríguez de la Pinta, Cristina

    2016-01-01

    La esquizofrenia, es uno de los trastornos psicóticos más prevalente y grave a nivel mundial. La idea de este trabajo es revisar algunos de los artículos publicados acerca de la conectividad en esta enfermedad, ofreciendo así una visión del funcionamiento cerebral de estos pacientes. No hay nada definitivo aún, pero la gran mayoría de los estudios coinciden en que la alteración de la conectividad funcional entre las diferentes redes neuronales es una de las bases fundamental...

  12. Functional enviromics and personality disorders

    OpenAIRE

    Cuartas Arias, Mauricio; Universidad de San Buenaventura - Medellín, Colombia

    2015-01-01

    La enviromica funcional aborda el análisis de los mecanismos de tipo ambiental que subyacen al incremento en el riesgo de psicopatologías y trastornos de personalidad.Aunque para las ciencias básicas resulta aún complejo determinar cómo influye el ambiente, algunas aproximaciones han involucrado el estudio de las redes neuronales y los circuitos cerebrales en el adulto a partir del neurodesarrollo, el funcionamiento de los sistemas neuroendocrino y de neurotransmisión (NT), las dinámicas de v...

  13. Los fármacos antidepresivos como reguladores de la neurogénesis hipocámpica de roedores y humanos adultos

    OpenAIRE

    Ramírez-Rodríguez, Gerardo; Laguna-Chimal, José; Vega-Rivera, Nelly M.; Ortiz-López, Leonardo; Méndez-Cuesta, Luis; Estrada-Camarena, Erika M.; Babu, Harish

    2011-01-01

    El hallazgo de la formación de nuevas neuronas en el giro dentado (GD) del hipocampo amplió el conocimiento acerca de la plasticidad del encéfalo. En este sentido, la neurogénesis es un proceso que involucra diferentes eventos celulares tales como: la división de las células madre, la proliferación de los neuroblastos, la migración y la sobrevivencia celular, así como la maduración dendrítica, la elongación axonal y la integración de las neuronas nuevas a los circuitos neuronales existentes. ...

  14. Non Linear Dynamics and Chaos (La Dynamique Non-Lineaie et le Chaos)

    Science.gov (United States)

    1993-06-01

    du cerveau humain, tout autant que les "machines neuronales" en cours de pour plus de details voir en ref. [ I Il’article de A. Favre d~veloppement...l’hypothese sur la faqon syst~rnes nerveux. L’id~e selon laquelle la dont varient les coefficients avec le temps dynamique du cerveau , dans certains...coefficients de interprke comme la preuve d’un caract~re H’quation temporelle sont constants. 11 n’est fugitif des attracteurs du cerveau ? Ou bien

  15. Composicion de redes ambientales a partir de la calidad de servicio

    OpenAIRE

    Palleja Muñoz, Angel; Barba Martí, Antonio

    2009-01-01

    Las redes ambientales definen una iniciativa europea para la cuarta generación de omunicaciones móviles. En esos entornos, la composición de redes heterogéneas para posibilitar comunicaciones con calidad de servicio es un tema fundamental. En este artículo se presenta una propuesta para el diseño de composiciones basándose en el uso de técnicas de inteligencia artificial. Esta ubicuidad se proporciona mediante la omposición de redes ambientales se realiza mediante redes neuronales, algoritm...

  16. Application of Weibull analysis and artificial neural networks to predict the useful life of the vacuum packed soft cheese

    Directory of Open Access Journals (Sweden)

    Jesús Alexander Sánchez-González

    2017-01-01

    Full Text Available El objetivo de este trabajo fue evaluar la capacidad de las redes neuronales artificiales (RNA para predecir la vida útil y la acidez en el queso fresco envasado al vacío. En primer lugar, se prepararon muestras de queso de 200 g por unidad. Luego estas muestras se almacenaron en un intervalo de 2 a 4 días a temperaturas de 4, 10 y 16 ° C y humedad relativa del 67,5%. A lo largo del almacenamiento se determinaron la acidez (AC y la aceptabilidad sensorial. Esta aceptabilidad se utilizó para determinar el tiempo de vida útil (TVU por el método de riesgo sensorial Weibull modificado. Se creó y entrenó un conjunto de redes neuronales artificiales (RNA; como entradas se utilizaron la temperatura (T, tiempo de maduración (M y posibilidad de fallo (F (x y TVU y AC como salidas. A partir de este conjunto, se seleccionaron las redes con el menor error cuadrático medio (ECM y el mejor ajuste (R2. Estas redes mostraron coeficientes de correlación (R2 de 0,9996 y 0,6897 para TVU y AC respectivamente y buena precisión en comparación con modelos de regresión. Se muestra que la RNA puede usarse para modelar adecuadamente TVU y en menor grado AC de quesos frescos envasados al vacío.

  17. Sistema para Rehabilitación del Síndrome del Miembro Fantasma utilizando Interfaz Cerebro-Computador y Realidad Aumentada

    Directory of Open Access Journals (Sweden)

    Juan Esteban Arango

    2013-06-01

    Full Text Available En el presente trabajo, se utilizó un dispositivo BCI comercial, el Emotiv EPOC, el cual es un neuroheadset inalámbrico de alta resolución para la adquisición de señales EEG, para desarrollar una herramienta con detección inteligente de patrones neuronales paralela a la del desarrollador para la implementación de una aplicación que combina la Realidad Aumentada (AR. La aplicación pensada como posible tratamiento del Dolor del Miembro Fantasma (PLP en pacientes amputados. El desarrollo del motor de clasificación permitió tener un mayor control sobre los parámetros del procesamiento y detección de patrones en las señales, donde se obtuvo hasta un 82.1% de clasificación. Estas señales neuronales detectadas de un sujeto, se utilizan para descifrar su intención de cerrar o abrir un modelo virtual de una mano o de una prótesis adherida al muñón real a través del entorno AR, brindando retroalimentación visual al paciente. Lo que contribuiría a reducir neurológicamente el PLP.

  18. Neuropsychoanalyse: Hirntätigkeit als Zeichenprozess

    Directory of Open Access Journals (Sweden)

    Milan Scheidegger

    2014-12-01

    Full Text Available Fassen wir Geist und Natur nicht als Dichotomie sondern im Sinne von Peirce als Kontinuität auf, dann lässt die genauere Betrachtung des Körpers semiotische Leibphänomene als Zeichen einer Sprache erkennen, deren Grammatik es – im Sinne einer «Bioarchäologie» – zu entschlüsseln gilt. Hierfür stellen die Neurowissenschaften mit modernen Visualisierungstechniken geeignete epistemische Hilfsmittel bereit: Sie machen körperliche Vorgänge des Informationsaustausches sichtbar und heben die semiotisch wenig erschlossene Ebene komplexer neuronaler Zeichentransformationen ans Licht. Um eine Integration der physiologischen und psychologischen Perspektive bemüht sich das transdisziplinäre Projekt der «Neuropsychoanalyse». Sie hebt die Relevanz natürlicher Verarbeitungsmechanismen des Körpers für die subjektiv geprägten Zeichentransformationen des mentalen Erlebens hervor und weicht eine semiotisch allzu undurchlässige Grenzziehung zwischen Psycho- und Neurodynamik etwas auf. Die Hirntätigkeit als potenziell erkenntnisleitenden Zeichenprozess zu verstehen, darf aber nicht in einer unreflektierten Bezugnahme auf neuronale Zeichensysteme münden, wenn die Neuropsychoanalyse mehr als nur eine medienwirksame Neurokarikatur psychodynamischer Konzepte erreichen will.

  19. Data Exporter: A complementary tool to export data simulation from NEURON

    Directory of Open Access Journals (Sweden)

    Óscar Emilio Hernández

    2013-01-01

    Full Text Available Objetivos: Desarrollar una herramienta computacional en ambiente lenguaje de pro- gramación hoc de NEURON y de fácil uso, que permita el rápido almacenamiento de los resultados obtenidos para su posterior análisis en otros software tales como Matlab or IgorPro. Materiales y métodos: Para el desarrollo de Data Exporter se escribió un algoritmo en lenguaje de programación hoc de NEURON. El algoritmo, escrito en un único archivo de texto, esta dividido en 13 bloques, de los cuales solo el primero debe ser modificado para adaptarlo a una geometría y biofísica neuronal particular y para determinar la ruta de almacenamiento de los datos. Resultados: Se desarrollo un software que simula la propagación de potenciales de ac- ción a través de geometrías neuronales complejas. El uso de esta herramienta permite el almacenamiento de los resultados obtenidos, como potenciales y corrientes de membrana en diferentes puntos de toda la neurona, sin incremento significativo en el tiempo para el desarrollo de los procesos. Conclusiones: Data Exporter es un software que le da mayor flexibilidad a NEURON facilitando el acceso a nuevos neurocientíficos, los cuales pueden usarlo con solo conocer los códigos necesarios para el desarrollo de los archivos relacionados con las propiedades geométricas y biofísicas neuronales.

  20. Identifikationsverfahren zur Analyse von EEG-Signalen bei Epilepsie mit Reaktions-Diffusions Netzwerken

    Science.gov (United States)

    Gollas, F.; Tetzlaff, R.

    2007-06-01

    Partielle Differentialgleichungen des Reaktions-Diffusions-Typs beschreiben Phänomene wie Musterbildung, nichtlineare Wellenausbreitung und deterministisches Chaos und werden oft zur Untersuchung komplexer Vorgänge auf den Gebieten der Biologie, Chemie und Physik herangezogen. Zellulare Nichtlineare Netzwerke (CNN) sind eine räumliche Anordnung vergleichsweise einfacher dynamischer Systeme, die eine lokale Kopplung untereinander aufweisen. Durch eine Diskretisierung der Ortsvariablen können Reaktions-Diffusions-Gleichungen häufig auf CNN mit nichtlinearen Gewichtsfunktionen abgebildet werden. Die resultierenden Reaktions-Diffusions-CNN (RD-CNN) weisen dann in ihrer Dynamik näherungsweise gleiches Verhalten wie die zugrunde gelegten Reaktions-Diffusions-Systeme auf. Werden RD-CNN zur Identifikation neuronaler Strukturen anhand von EEG-Signalen herangezogen, so besteht die Möglichkeit festzustellen, ob das gefundene Netzwerk lokale Aktivität aufweist. Die von Chua eingeführte Theorie der lokalen Aktivität Chua (1998); Dogaru und Chua (1998) liefert eine notwendige Bedingung für das Auftreten von emergentem Verhalten in zellularen Netzwerken. Änderungen in den Parametern bestimmter RD-CNN könnten auf bevorstehende epileptische Anfälle hinweisen. In diesem Beitrag steht die Identifikation neuronaler Strukturen anhand von EEG-Signalen durch Reaktions-Diffusions-Netzwerke im Vordergrund der dargestellten Untersuchungen. In der Ergebnisdiskussion wird insbesondere auch die Frage nach einer geeigneten Netzwerkstruktur mit minimaler Komplexität behandelt.

  1. Structural control using magnetorheological dampers governed by predictive and dynamic inverse models

    Directory of Open Access Journals (Sweden)

    Luis Augusto Lara-Valencia

    2014-01-01

    Full Text Available En este artículo se implementa um novedoso proyecto de control estructural numérico en una edificación de dos pisos con el obj etivo de reducir vibraciones debidas a cargas de tipo transiente. La est ructura analizada corresponde a un prototipo experimental debid amente caracterizado y modelado de acuerdo con la hipótesis del diafra gma. El controlador utilizado se basa en la acción de un par de amortiguadores magnetoreológicos (MR reales cuyo funcionamient o es emulado a través del denominado modelo fenomenológico. Los disipadores son gobernados por un sistema numérico basado en re des neuronales artificiales del tipo NARX con la capacidad de determinar fuerzas óptimas de control y voltajes a través de un modelo de predicción y un modelo inverso, los cuales son de us o inédito en este tipo de sistemas. Los resultados obtenidos muestran que el proyecto de control basado en redes neuronales desarrollado en este trabajo es un controlador confiable y eficiente, consiguiendo r educciones de hasta 69% en los valores pico de respuesta.

  2. Identificación Inteligente de un Proceso Fermentativo Usando el Algoritmo GMDH Modificado

    Directory of Open Access Journals (Sweden)

    F. Hernández

    2012-01-01

    Full Text Available Resumen: En este trabajo se aborda, de manera particular, un método para el diseño del algoritmo conocido como Group Method of Data Handling, GMDH, típico con lazo recurrente. Una modificación en una de sus fases de entrenamiento permite ampliar el número de variables utilizadas en cada capa y con ello el área de regresión. Consecuentemente se puede obtener una estructura optimizada en sí misma de mayor complejidad, posibilitando la aparición de lazos recurrentes en las capas intermedias. Lo anterior permite una reducción del error en la modelación de procesos no lineales de lento comportamiento, como el crecimiento celular en biorreactores. El modelo se probó en una fermentación tipo feed-batch de la levadura Pichia pastoris. La estabilidad y capacidad de generalización es demostrada. El método propuesto es comparado con el GMDH típico recurrente y con otras estructuras de redes neuronales clásicas. Palabras clave: redes neuronales, recurrente, algoritmo genético, modelación, fermentación

  3. APLICACIÓN DE MAPAS DE KOHONEN PARA LA PRIORIZACIÓN DE ZONAS DE MERCADO: UNA APROXIMACIÓN PRÁCTICA

    Directory of Open Access Journals (Sweden)

    Harol Mauricio Gámez Albán

    Full Text Available Este artículo presenta una metodología basada en redes neuronales para realizar priorización de zonas de mercado visto desde un enfoque empresarial. En esta investigación se intenta dar solución a la incertidumbre que existe en la mayoría de las organizaciones en torno a la prioridad que tiene una zona de mercado; para ello se hace una búsqueda de los criterios más relevantes que las empresas tienen en cuenta para asignar prioridades a ciertos clientes. La problemática se sustenta por la ausencia de herramientas que permitan determinar la prioridad de una zona de mercado y la falta de una interrelación efectiva entre los departamentos de logística y mercadeo. Para ello se ocupan los mapas de Kohonen que son un tipo de red neuronal que facilita el agrupamiento de clientes y permiten determinar cuáles de ellos son los que impactan con mayor frecuencia los criterios de priorización previamente establecidos. Finalmente, se presentan tres escenarios con fin de validar la propuesta formulada y ver qué comportamiento tienen las redes neuronales en temas de priorización de zonas de mercado.

  4. Detecting and classifying faults on transmission systems using a backpropagation neural network; Deteccion y clasificacion de fallas en sistemas de transmision empleando una red neuronal con retropropagacion del error

    Energy Technology Data Exchange (ETDEWEB)

    Rosas Ortiz, German

    2000-01-01

    es una de las areas de investigacion de mas rapido crecimiento en el campo de la IA y el reconocimiento de patrones. Este trabajo explora la posible aplicabilidad de una tecnica de reconocimiento de patrones basada en redes neuronales para la deteccion y la clasificacion de fallas en un SEP. Las tecnicas convencionales de deteccion en los relevadores modernos se basan en un procesamiento digital de senales y requieren de cierto tiempo (alrededor de 1 ciclo) para enviar una senal de disparo, ademas de ser propensas a tomar decisiones incorrectas si las senales se encuentran contaminadas por ruido. Es deseable entonces desarrollar tecnicas que sean rapidas, exactas y robustas y que tengan un buen desempeno ante las condiciones cambiantes del sistema (como variaciones de carga y resistencia de falla, por ejemplo). El objetivo de este trabajo es desarrollar una tecnica novedosa basada en Redes Neuronales Atificales (RNA), la cual explora la aplicabilidad de la propuesta de reconocimiento de patrones para el diagnostico y deteccion de fallas. La tecnica sugerida se basa en el hecho de que cuando ocurre una falla, toma lugar un cambio de impedancia en el sistema y como consecuencia, cambios en la amplitud y fase de las senales de voltajes y corrientes de linea toman lugar. Se desarrolla un discriminador de fallas basado en redes neuronales que es entrenado para detectar estos cambios como indicadores del instante de ocurrencia de la falla. Este detector utiliza valores instantaneos de esas senales para tomar decisiones. Se describe a detalle la aplicabilidad de las redes neuronales como clasificadores de patrones para el diagnostico de fallas en sistemas de transmision y ademas, se presenta un diseno basado en redes neuronales y su ambiente de simulacion para la deteccion y clasificacion de fallas en tiempo real. Se presentan resultados del desempeno de esta tecnica que muestran que es rapida, segura y suficientemente exacta e indican su aplicabilidad dentro de esquemas de

  5. Scratch resistance and localised damage characteristics of polymer surfaces - a review

    Energy Technology Data Exchange (ETDEWEB)

    Briscoe, B.J. [Department of Chemical Engineering and Chemical Technology, Imperial College, London SW7 2BY (United Kingdom); Sinha, S.K. [Department of Mechanical Engineering, National University of Singapore (Singapore)

    2003-11-01

    The ''Scratch Test'' is, arguably, the earliest and amongst the now most widely used techniques for evaluating a wide range of surface mechanical properties. Some of the areas where this test has been successfully used in the engineering field, both by research and industry, include the determination of the relative hardness of materials, characterizations of coatings, paints and thin-films, modeling of the wear of materials and the estimation of different material deformation characteristics when subjected to hard asperity damage. In this paper we have reviewed the ''state-of-the-art'' in the scratch method for polymeric materials. The paper provides some important theoretical models that have been developed in the field of scratching for material property characterizations. Results from different types of scratch tests (macro, micro and nano scales) on a range of polymeric materials are presented with critical discussion on the usefulness of each result. Finally, various areas for further research in scratching of polymer surfaces have been identified. (Abstract Copyright [2003], Wiley Periodicals, Inc.) [German] Der ''Ritztest'' ist wohl das aelteste und mit am meisten verwendete Verfahren zur Beurteilung von oberflaechenmechanischen Eigenschaften. Zu den technischen Bereichen, in denen dieser Test sowohl in der Forschung als auch in der Industrie erfolgreich Anwendung gefunden hat, zaehlen die Bestimmung der relativen Materialhaerte, die Charakterisierung von Beschichtungen, Lackierungen und Duennschichten, die Modellierung des Werkstoffverschleisses sowie die Abschaetzung verschiedener Werkstoffverformungsparameter bei Beanspruchung durch harte Rauheitsspitzen. Der vorliegende Bericht beschreibt den gegenwaertigen Stand der Anwendung des Ritzverfahrens fuer polymere Materialien. Er enthaelt wichtige theoretische Modelle, die fuer die Anwendung des Ritzens zur Charakterisierung von

  6. Gaming

    CERN Document Server

    Duke, Richard D

    2014-01-01

    Als Richard Duke sein Buch ""Gaming: The Future's Language"" 1974 veröffentlichte, war er ein Pionier für die Entwicklung und Anwendung von Planspielen in Politik, Strategieentwicklung und Management. Das Buch wurde zu einem viel zitierten Standardwerk. 2014 feiert die von Richard D. Duke gegründete International Simulation and Gaming Association (ISAGA) ihr 45-jähriges Bestehen. Gleichzeitig legt Richard D. Duke eine überarbeitete Auflage seines Klassikers vor.   Inhaltsverzeichnis TABLE OF CONTENTSAcknowledgments Preface SECTION I1. The ProblemSECTION II2. Modes of Human Communication3. Mode

  7. Die Entwicklung des Eigentums- und Gesellschaftsrechts in Estland / Ilmar Selge

    Index Scriptorium Estoniae

    Selge, Ilmar, 1954-

    1992-01-01

    Õigusaktide tõlked: ROW nr. 6, lk. 181-190 (tlk. Ilmar Selge) - Gesetz der Republik Estland über die Grundlagen der Eigentumsreform ; Beschluss des Obersten Rates der Republik Estland über die Anwendung des Gesetzes über die Grundlagen der Eigentumsreform ; Bodenreformgesetz der Republik Estland ; Beschluss des Obersten Rates der Republik Estland über das Inkrafttreten des Bodenreformgesetz der Republik Estland. ROW nr. 10, lk. 307-310 (tlk. Ilmar Selge) - Gesetz der Republik Estland über ausländische Investitionen ; Unternehmenseinkommensteuergesetz (Auszug)

  8. Analyzing different HPCI operation modes simulated with ATHLET-CD regarding possible core degradation phenomena in Fukushima-Daiichi unit 3

    Energy Technology Data Exchange (ETDEWEB)

    Bratfisch, Christoph; Koch, Marco K. [Ruhr-Univ. Bochum (Germany). Reactor Simulation and Safety Group

    2017-02-15

    For extented application and analyses of the severe accident code ATHLET-CD, the course of the invessel accident in Unit 3 of Fukushima-Daiichi is simulated in the frame of the research project SUBA as a part of the BMBF sponsored collaborative project WASA-BOSS (Weiterentwicklung und Anwendung von Severe Accident Codes - Bewertung und Optimierung von Stoerfallmassnahmen). Investigations, carried out by TEPCO, had shown that the High-Pressure Coolant Injection system (HPCI) might have stopped earlier than expected. A parameter variation was performed to analyze the impact of the tripped HPCI injection regarding the thermohydraulic behaviour as well as the core degradation phenomena.

  9. Die Grundlagen der Fernsehtechnik: Systemtheorie und Technik der Bildübertragung

    Science.gov (United States)

    Mahler, Gerhard

    Umfassende Einführung in die Grundlagen der Bewegtbild-Übertragung von den Anfängen bis zum heutigen Stand des digitalen Fernsehens mit einer aus der Praxis entstandenen systemtheoretischen Analyse. Die kompakte und anschaulich bebilderte Darstellung mit elementaren mathematischen Beschreibungen macht es dem Leser leicht, sich in die Bildübertragungstechnik einzuarbeiten. Thematische Einheiten erweitern den Wissensstoff - u.a. zu den Themen visuelle Wahrnehmung, mehrdimensionale Signaldarstellung, Farbmetrik, Digitalisierung, Elektronenoptik - und zeigen deren Anwendung auf die elektronische Bildübertragung.

  10. Survey of legislation applicable in Germany for implementation of the EC Directive on environmental audits; Ueberblick ueber die in Deutschland fuer die Ausfuehrung der EG-Umwelt-Audit-Verordnung geltenden Rechtsvorschriften

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1997-06-01

    The brochure presents a comprehensive survey of the relevant legislation applicable in Germany to implementation of the EC Directive on environmental auditing. Readers interested in performing such auditing at one glance will find in this compiulation all relevant laws and regulations in full text that are to be observed for implementation of this novel environmental auditing instrument. (orig./RHM) [Deutsch] Diese Broschuere vermittelt einen umfassenden Ueberblick ueber die in Deutschland fuer die Ausfuehrung der EG-Umwelt-Audit-Verordnung geltenden Rechtsvorschriften. Damit wird fuer alle Interessenten ein rascher Zugriff auf die Rechtstexte, die zur praktischen Anwendung des neuartigen Umwelt-Audit-Instruments notwendig sind, ermoeglicht. (orig./RHM)

  11. Optimization of environment compatible analysis methods for mineral hydrocarbons in the soil; Optimierung umweltvertraeglicher Analysenverfahren fuer Mineraloelkohlenwasserstoffe im Boden

    Energy Technology Data Exchange (ETDEWEB)

    Flachowsky, J.; Borsdorf, H. [eds.] [UFZ - Umweltforschungszentrum Leipzig-Halle GmbH, Leipzig (Germany); Loehmannsroeben, H.G.; Roch, T. [Erlangen-Nuernberg Univ., Erlangen (Germany); Leopom, P. [Umweltbundesamt, Berlin (Germany); Reimers, C. [Technische Univ. Hamburg-Harburg, Hamburg (Germany); Matz, G.; Kuebler, J. [MOBILAB GmbH, Hamburg (Germany); Christall, B. [SOFIA GmbH, Berlin (Germany); Hahn, M.; Matschiner, H. [Elektrochemie Halle GmbH (Germany); Baermann, A. [Dr. Baermann und Partner Mikroanalytik, Hamburg (Germany)

    1997-12-31

    This paper describes several analytical methods for the quantitative chemical analysis of mineral oil hydrocarbons in soils. The measuring methods are investigated on accuracy, errors, sample preparation methods, analysis of reference materials and real materials. (SR) [Deutsch] Mit dieser Schrift praesentiert die Deutsche Bundesstiftung Umwelt der Oeffentlichkeit Ergebnisse zu alternativen umweltvertraeglichen Bestimmungsmethoden fuer Mineraloelkohlenwasserstoffe in Boeden. Es war in erster Linie das Ziel aller beteiligten Forscher und Entwickler, die heute noch in der Anwendung befindliche Vorschrift nach DIN 38409 H18 zur Analytik von Mineraloelkohlenwasserstoffen durch eine sowohl umweltfreundliche als auch insgesamt aussagekraeftige Methode zu substituieren. (orig.)

  12. 'Subjektives' und 'objektives' Wissen in der audiologischen Diagnose

    DEFF Research Database (Denmark)

    Egbert, Maria

    sozial-psychologischen Barrieren (z.B. Stigma) die Interaktion zwischen Audiologen und Patienten selten erfolgreich verläuft. Ein Hauptproblem liegt darin, die 'objektive' Hördiagnose, (erstellt durch ein Audiogramm) in Zusammenhang zu bringen mit den 'subjektiven' Hörbeschreibungen des Patienten. Da der...... Audiologe sowohl auf die objektive als auch auf die subjektive Darstellung angewiesen ist, widmet sich diese Studie anhand von authentischen Videoaufnahmen diesen Diskrepanzen. Als methodischer Rahmen für die Anwendung der Ergebnisse werden die Ansätze "User-Centred Design" und "Social Innovation...

  13. Die biene und ihre produkte in der kunst und im alltagsleben (Fruhchristliche und byzantinische Zeit

    Directory of Open Access Journals (Sweden)

    Liveri Angeliki

    2010-01-01

    Full Text Available Die vorliegende Arbeit ist in zwei Teile geteilt: den kunst- und kulturhistorischen Teil. Im ersten Teil werden Darstellungen uber Bienen Bienenzucht, Honig und Wachs seit der fruhchristlichen bis zur spatbyzantinischen Zeit vorgefuhrt. Daher ist es als Beitrag in der "Ikonographie" der Biene wahrend dieser Zeit zu verstehen. Im kulturhistorischen Teil werden Informationen uber die Bienenzucht, den Handel mit Honig und Wachs sowie ihre vielfaltige Anwendung von der byzantinischen Gesellschaft an Hand der primaren Quellen, des Standes der Forschung und der archaologischen Funden erwahnt. Damit ist erwunscht ein moglichst gutes Bild der byzantinischen Bienenzucht wieder zu geben und die Nutzung der Bienenprodukte in Byzanz anschaulich zu machen.

  14. Haftung des "Director" einer englischen "Limited" gemäß § 64 GmbHG

    DEFF Research Database (Denmark)

    Ringe, Georg

    2016-01-01

    Für die Frage, ob und inwiefern auf EU-Auslandsgesellschaften inländisches Insolvenz- bzw. Gläubigerschutzrecht angewandt werden kann, differenziert der EuGH in seiner Entscheidung zwischen Vorschriften, die die Gründung der Gesellschaft und solchen, welche die spätere Tätigkeit betreffen. Wolf-G......-Georg Ringe (JZ 2016, 573) untersucht die Konsequenzen einer solchen Differenzierung und widerspricht dem Ergebnis des EuGH, der zur Anwendung des (insolvenzrechtlich qualifizierten) § 64 GmbHG im Fall einer englischen Limited kommt....

  15. Advances in radiographic NDI of pipe systems; Fortschritte bei der Durchstrahlungspruefung von Rohrleitungssystemen

    Energy Technology Data Exchange (ETDEWEB)

    Morgner, W. [NSQ HAUK, Ludwigshafen (Germany); Hauk, T. [NSQ HAUK, Ludwigshafen (Germany); Tschachlov, V. [NSQ HAUK, Tomsk (Russian Federation)

    1995-12-31

    The paper discusses the application of a small-sized betatron and its operational parameters, and its uses for very small angle tomography of medium-filled pipes or a thick weld. Other aspects discussed are the handling of large numbers of X-ray images by means of an X-ray manipulator, film digitalization, and data management of imaging data. (orig./MM) [Deutsch] Dieser Beitrag behandelt die Anwendung eines Kleinbetatrons und seiner Leistungsparameter, damit durchgefuehrte Durchstrahlungspruefungen an mediumgefuellten Rohren und eine an einer dicken Schweissnaht realisierte Wenigwinkeltomographie. Bezueglich der Beherrschung einer Grosszahl von Roentgenaufnahmen wird ueber einen Roentgenmanipulator, die Filmdigitalisierung und das Datenmanagement von Bilddaten berichtet. (orig./MM)

  16. Graded thermal insulation layer systems; Gradierte Waermedaemmschichtsysteme

    Energy Technology Data Exchange (ETDEWEB)

    Leushake, U.; Krell, T. [Deutsche Forschungsanstalt fuer Luft- und Raumfahrt e.V. (DLR), Koeln (Germany). Inst. fuer Werkstoff-Forschung

    1996-12-31

    Graded thermal insulation systems reduce local stresses between two layers. Grading usually involves a concentration variation in a second phase but may also involve variations of the microstructure or chemical composition. The contribution discusses the application of this technique for thermal protection of turbine blades in aircraft propulsion systems. [Deutsch] Mit Hilfe gradierter Waermeschichtsysteme ist es moeglich die lokalen Spannungen zwischen zwei Schichten zu verringern. Die Gradierung umfasst meistens eine Variation des Gehaltes einer zweiten Phase, kann aber auch die Variation der Mikrostruktur oder der chemischen Zusammensetzung beinhalten. In diesem Beitrag wird auf die Anwendung als thermischer Schutz von Turbinenschaufeln fuer Flugtriebwerke eingegangen.

  17. Wässrige Nanosuspensionen zur pulmonalen Applikation

    OpenAIRE

    Scherließ, Holger

    2008-01-01

    Im Rahmen der vorliegenden Arbeit wurde die Entwicklung einer Nanosuspensionsformulierung zur inhalativen Anwendung mit dem schwerlöslichen Antimykotikum Itraconazol untersucht. Viele der neu entwickelten pharmazeutischen Wirkstoffe sind nach der Arzneibuchdefinition als schwerlöslich, sehr schwer löslich oder gar praktisch unlöslich einzuteilen. Das bedingt in der Praxis häufig Probleme in der Bioverfügbarkeit und stellt eine große Herausforderung für die Galenik dar. Die Herstellung der Nan...

  18. Local Dynamic Map als modulares Software Framework für Fahrerassistenzsysteme

    Science.gov (United States)

    Reisdorf, P.; Auerswald, A.; Wanielik, G.

    2015-11-01

    Moderne Fahrerassistenzsysteme basieren auf der Verarbeitung von Informationen, welche durch die Umfeldwahrnehmung mit unterschiedlicher Sensorik erfolgt. Neben den Informationen aus dem eigenen Fahrzeug ergeben sich durch unterschiedliche Kommunikationsmöglichkeiten (Car2Car, Car2X,...) erweiterte Umfeldwahrnehmungen (siehe Abb. 1). Diese Daten gilt es aufbereitet und zielorientiert einer Anwendung zur Verfügung zu stellen, was mit Hilfe einer Local Dynamic Map (LDM) erfüllt werden kann. Die vorliegende Veröffentlichung beschreibt den Aufbau, Verwendungszweck und Eigenschaften einer entwickelten LDM und geht auf einige Applikationen ein, die mit Hilfe dieser realisiert wurden.

  19. Rückstandsanalytische Untersuchungen für eine aktualisierte Bewertung des Einsatzes hormonal wirksamer Leistungsförderer in der Tiermast

    OpenAIRE

    Lange, Iris Gudrun

    2005-01-01

    Bei der Anwendung hormonal wirksamer Leistungsförderer in der Tiermast in Form von Implantationspräparaten ist die Einhaltung der "Guten Veterinärpraxis" unabdingbar. Gelangen Implantationsstellen in die Nahrungskette, können ganze Chargen von Fleischprodukten kontaminiert werden. Das höchste Gefährdungspotential geht dabei von Trenbolonacetatpräparaten aus, gefolgt von Östradiol bzw. Östradiolbenzoat, Testosteronpropionat und Progesteron. Eine Evaluierung von Zeranol war diesbezüglich im Rah...

  20. Solar-aided air conditioning through sorption. Final report. Phase 2; Solar unterstuetzte Klimatisierung ueber Sorption. Endbericht zur Phase 2

    Energy Technology Data Exchange (ETDEWEB)

    Laevemann, E; Kessling, W; Peltzer, M

    1996-09-24

    The present article reports on possibilities of using solar energy for cooling buildings. It contains the following chapters: Current state of research and development; room air conditioning; planning and results of the studies; theory; experimental studies on the sorption dehumidifier; development of exchange surfaces; development of solution distributors; cooling of exchange surfaces; construction of a sorption dehumidifier. (HW) [Deutsch] Die Arbeit berichtet ueber Moeglichkeiten der Anwendung von Solarenergie zur Kuehlung von Gebaeuden. Die Arbeit enthaelt folgende Kapitel: - Stand der Forschung und Entwicklung - Raumklimatisierung - Planung und Ergebnis der Untersuchungen - Theorie - Experimentelle Untersuchungen am Sorptionsentfeuchter - Entwicklung von Austauschflaechen - Entwicklung von Loesungsverteilern - Kuehlung von Austauschflaechen - Konstruktion eines Sorptionsentfeuchters. (HW)