Analyse der Störfestigkeit nichtlinearer Schaltungen gegenüber leitungsgebundenen elektromagnetischen Störungen mit multi-input Wiener/Hammerstein-Modellen

In dieser Arbeit wird der Einfluss von leitungsgebundenen Störungen untersucht, welche in einen beliebigen Eingang (Signaleingang, Spannungsversorgung, Masse-Potenzial, etc.) einer Analogschaltung einkoppeln. Die zu untersuchende Schaltung wird dazu durch einen Wiener/Hammerstein-Ansatz als nichtlineares System mit zwei Eingängen modelliert. Mit Hilfe dieses Blockmodells werden analytische Ausdrücke derjenigen Frequenzanteile bestimmt, die durch Intermodulationen zwischen Stör- und Eingangssignal am Ausgang einer Schaltung entstehen.BMBF/03X4604

O nascimento do cristianismo: discussão crítica das propostas de Burton Mack e Gerd Theissen

The authors offer a critical discussion of the proposal of Burton L. Mack and Gerd Theissen concerning when and under what conditions Christianity arose. They argue that the unique identity of the believers in Christ in relation to the Jewish faith was the result of a new social practice that had its beginning in Antioch where something new happened: The inclusion of the non-jews in the Jewish fellowship of the followers of the kyrios Jesus.Los autores presentan una discusión crítica de las propuestas de Burton L. Mack y Gerd Theissen sobre cuando y en que condiciones surgió el cristianismo. Sustentan que la identidad propia de los creyentes en Cristo en relación de la fe judaica fue resultado de una nueva praxis social, que tuvo inicio en Antioquia, donde sucedió algo nuevo: La incorporación de los no judíos para la comunión judaica de los adeptos del Kyrios Jesús.Os autores apresentam uma discussão crítica das propostas de Burton L. Mack e Gerd Theissen sobre quando e em que condições surgiu o cristianismo. Sustentam que a identidade própria dos crentes em Cristo em relação à fé judaica foi resultado de uma nova práxis social, que teve início em Antioquia, onde aconteceu algo novo: a agregação de não-judeus à comunhão judaica dos adeptos do kyrios Jesus

Two-dimensional wave patterns of spreading depolarization: retracting, re-entrant, and stationary waves

We present spatio-temporal characteristics of spreading depolarizations (SD) in two experimental systems: retracting SD wave segments observed with intrinsic optical signals in chicken retina, and spontaneously occurring re-entrant SD waves that repeatedly spread across gyrencephalic feline cortex observed by laser speckle flowmetry. A mathematical framework of reaction-diffusion systems with augmented transmission capabilities is developed to explain the emergence and transitions between these patterns. Our prediction is that the observed patterns are reaction-diffusion patterns controlled and modulated by weak nonlocal coupling. The described spatio-temporal characteristics of SD are of important clinical relevance under conditions of migraine and stroke. In stroke, the emergence of re-entrant SD waves is believed to worsen outcome. In migraine, retracting SD wave segments cause neurological symptoms and transitions to stationary SD wave patterns may cause persistent symptoms without evidence from noninvasive imaging of infarction