Evaluation of the applicability of FRA for inter-turn fault detection in stator windings

In this paper, the applicability of the FRA technique is discussed as a method for detecting inter-turn faults in stator windings. Firstly, this method is tested in an individual medium-voltage stator coil with satisfactory results. Secondly, the tests are extended to a medium-voltage induction motor stator winding, in which inter-turn faults are performed in every coil end of one phase. Results of the frequency response in case of inter-turn faults are evaluated in both cases for different fault resistance values. The experimental setup is also described for each experiment. The results of the application of this technique to the detection of inter-turn faults justify further research in optimizing this technique for preventive maintenance.

Expedición a Asturias en 1897: La Felguera, fábrica de zinc en Arnao, alumbrado eléctrico en Oviedo y El Turón

Expedición a Asturias en 1897 : La Felguera, Fábrica de Zinc en Arnao, alumbrado eléctrico en Oviedo y El Turón

Dynamic media stream mobility with TURN

Multi party videoconference systems use MCU (Multipoint Control Unit) devices to forward media streams. In this paper we describe a mechanism that allows the mobility of such streams between MCU devices. This mobility is especially useful when redistribution of streams is needed due to scalability requirements. These requirements are mandatory in Cloud scenarios to adapt the number of MCUs and their capabilities to variations in the user demand. Our mechanism is based on TURN (Traversal Using Relay around NAT) standard and adapts MICE (Mobility with ICE) specification to the requirements of this kind of scenarios. We conclude that this mechanism achieves the stream mobility in a transparent way for client nodes and without interruptions for the users.

Donde se rompen las nubes : Lever House : Nueva York 1950

En la victoriosa América de la posguerra, origen de la nueva configuración del mundo occidental, surgió una singular obra que iba a representar la abstracción de los valores universales de la arquitectura moderna. La construcción de la Lever House en el Nueva York de 1950 no sólo iba a propiciar un punto de inflexión en la Historia del rascacielos y de la arquitectura corporativa americana, definiría a su vez un nuevo paradigma a partir del cual se establecerían generalizados modelos para la construcción del futuro. La oportuna confluencia entre los acentos pragmáticos del mundo capitalista americano y las formulaciones positivistas de la arquitectura moderna europea, convenientemente recogidas como manifiesto construído del Estilo Internacional, supusieron resolver de manera definitiva el prolongado dilema americano de cómo debería ser la adecuada representación del edificio corporativo moderno. El estudio se detendrá en el valor de la metáfora, la conversación y la oportunidad de una obra cuya proyección trascendió ampliamente las aspiraciones de sus creadores. Provocando una fuerte idealización que llegaría hasta nuestros días. ABSTRACT In the postwar victorious America, origin of the new configuration of the Western World, a unique work will represent the abstraction of the universal values of modern architecture. The construction of the Lever House in the New York of 1950 would not only bring about a turning point in the history of American skyscrapers and corporate architecture, in turn define a new paradigm from which generalized models for building the future. The timely confluence between pragmatic accents of the American capitalist world and the positivistic formulations of the modern European architecture, conveniently collected as constructed manifesto of the International Style, definitively accounted to resolve that old American dilemma of how should be the adequate representation of the Modern corporate building. The study will focus on the value of metaphor, conversation and the opportunity of a work whose projection widely transcended the aspirations of its creators. Causing an strong idealization would reach to nowadays.