982 resultados para Fourier, Karl.


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Traveling-wave excitation close to the speed of light implies small-angle target-irradiation. Yet, short-wavelength lasing needs large irradiation angles. Pulse-front back-tilt is considered to overcome such trade-off. Pulse-front tilt by means of compressor misalignment was found effective only if coupled with a strong front-end imaging/focusing component.

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von Julius Plotke

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The electronic structure of atomically precise armchair graphene nanoribbons of width N=7 (7-AGNRs) are investigated by scanning tunneling spectroscopy (STS) on Au(111). We record the standing waves in the local density of states of finite ribbons as a function of sample bias and extract the dispersion relation of frontier electronic states by Fourier transformation. The wave-vector-dependent contributions from these states agree with density functional theory calculations, thus enabling the unambiguous assignment of the states to the valence band, the conduction band, and the next empty band with effective masses of 0.41±0.08me,0.40±0.18me, and 0.20±0.03me, respectively. By comparing the extracted dispersion relation for the conduction band to corresponding height-dependent tunneling spectra, we find that the conduction band edge can be resolved only at small tip-sample separations and has not been observed before. As a result, we report a band gap of 2.37±0.06 eV for 7-AGNRs adsorbed on Au(111).

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Tübingen, Univ., Universitätsprogramm, 1881

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We present an application and sample independent method for the automatic discrimination of noise and signal in optical coherence tomography Bscans. The proposed algorithm models the observed noise probabilistically and allows for a dynamic determination of image noise parameters and the choice of appropriate image rendering parameters. This overcomes the observer variability and the need for a priori information about the content of sample images, both of which are challenging to estimate systematically with current systems. As such, our approach has the advantage of automatically determining crucial parameters for evaluating rendered image quality in a systematic and task independent way. We tested our algorithm on data from four different biological and nonbiological samples (index finger, lemon slices, sticky tape, and detector cards) acquired with three different experimental spectral domain optical coherence tomography (OCT) measurement systems including a swept source OCT. The results are compared to parameters determined manually by four experienced OCT users. Overall, our algorithm works reliably regardless of which system and sample are used and estimates noise parameters in all cases within the confidence interval of those found by observers.

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Hermann Becker

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Boberach: Statt des Doppeladlers soll der ursprüngliche einfache Adler, der auch auf den abgebildeten Siegeln und Münzen der Kaiser von Ludwig dem Frommen bis Maximilian I. erscheint, Hoheitszeichen sein. Die Umgestaltung Deutschlands bietet die Gelegenheit der Besinnung auf das Werk der Hohenstaufen. Der Reichstag soll von der besitzenden und der nichtbesitzenden Klasse paritätisch gewählt werden und auf Vorschlag der Fürsten das mit suspensivem Veto ausgestattete Reichsoberhaupt auf fünf Jahre wählen. - Wentzke: Reichsoberhaupt von der Volksvertretung, dem Reichstag, auf Vorschlag der Fürsten auf 5 Jahre zu wählen, mit suspensivem Veto. Zum Reichstag wählen die besitzende und die nichtbesitzende Klasse je eine gleiche Anzahl von Abgeordneten

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Welsch (Projektbearbeiter): Verurteilung des Schauspielers Freiherr von Brand sowie des Hausmeisters Halmdienst zu zehn- bzw. sechsmonatiger Kerkerhaft wegen bewaffneten Aufruhrs

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J. Aronius

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J. Kracauer