@misc{HellwigNikolaus2004, author = {Hellwig, Udo and Nikolaus, Hartwig}, title = {CFD-Simulation zur Untersuchung des Str{\"o}mungsverhaltens in Strukturrohren}, series = {Wissenschaftliche Beitr{\"a}ge 2004}, volume = {9}, journal = {Wissenschaftliche Beitr{\"a}ge 2004}, issn = {0949-8214}, doi = {10.15771/0949-8214_2004_1_5}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-3991}, pages = {26 -- 33}, year = {2004}, abstract = {Die CFD (Computational Fluid Dynamics)-Simulation hat mittlerweile in alle technischen Bereiche Einzug gehalten, in denen die Vorhersage str{\"o}mungstechnischer Ereignisse relevant ist. Nach wie vor ist allerdings eine Validierung von Rechenergebnissen mit Messdaten unerl{\"a}sslich, um zu vertrauensw{\"u}rdigen Simulationsergebnissen zu kommen. Dies ist u. a. darauf zur{\"u}ckzuf{\"u}hren, dass die am Markt verf{\"u}gbare CFD-Software darauf ausgerichtet ist, ein m{\"o}glichst breites Anwendungsspektrum zu bedienen. Die implementierten Berechnungsmodelle m{\"u}ssen im Rahmen der Modellierung durch die Wahl geeigneter Randbedingungen an den zu untersuchenden Anwendungsfall angepasst werden.}, language = {de} } @article{WolfRichter2003, author = {Wolf, Bodo and Richter, Asta}, title = {The concept of differential hardness in depth sensing indentation}, series = {New Journal of Physics}, volume = {5}, journal = {New Journal of Physics}, number = {15}, issn = {1367-2630}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-5657}, pages = {15.1 -- 15.17}, year = {2003}, abstract = {Since in-depth sensing indentation load-depth data of the entire loading-unloading cycle are available, more information than a single hardness value and an elastic modulus can be extracted from the experimental data. The conventional hardness H (h) = F (h)/Ac(h) and the differential hardness Hd(h)=dF/dAc are calculated as continuous functions of depth h and compared to each other in this paper (F: load, Ac: contact area). It turns out that Hd describes the momentary material resistance to deformation, whereas H integrates over deformation states from first tip-sample contact to current penetration h. This difference is particularly important for materials not homogeneous in depth (e.g. layer systems), and for situations where time-dependent external factors influence the momentary deformation resistance. Photoplasticity is considered as an example for the latter.}, language = {en} } @article{GrytsenkoLozovskiStrilchuketal.2012, author = {Grytsenko, Kostyantyn and Lozovski, Valeri and Strilchuk, Galyna and Schrader, Sigurd}, title = {Evaluation of the Mechanism of the Gold Cluster Growth during Heating of the Composite Gold-Polytetrafluoroethylene Thin Film}, series = {Nanomaterials}, volume = {2}, journal = {Nanomaterials}, number = {4}, issn = {2079-4991}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-6387}, pages = {366 -- 378}, year = {2012}, abstract = {Nanocomposite films consisting of gold inclusions in the polytetrafluoroethylene (PTFE) matrix were obtained by thermal vacuum deposition. Annealing of the obtained films with different temperatures was used to measure varying of film morphologies. The dependence of optical properties of the films on their morphology was studied. It was established that absorption and profile of the nanocomposite film obtained by thermal vacuum deposition can be changed with annealing owing to the fact that different annealing temperatures lead to different average particle sizes. A method to calculate the optical properties of nanocomposite thin films with inclusions of different sizes was proposed. Thus, comparison of experimental optical spectra with the spectra obtained during the simulation enables estimating average sizes of inclusions. The calculations give the possibility of understanding morphological changes in the structures.}, language = {en} } @article{Enders2016, author = {Enders, Peter}, title = {Historical Prospective: Boltzmann's versus Planck's State Counting—Why Boltzmann Did Not Arrive at Planck's Distribution Law}, series = {Journal of Thermodynamics}, volume = {2016}, journal = {Journal of Thermodynamics}, issn = {1687-9252}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-6281}, pages = {13}, year = {2016}, abstract = {Why does Planck (1900), referring to Boltzmann's 1877 probabilistic treatment, obtain his quantum distribution function while Boltzmann did not? To answer this question, both treatments are compared on the basis of Boltzmann's 1868 three-level scheme (configuration—occupation—occupancy). Some calculations by Planck (1900, 1901, and 1913) and Einstein (1907) are also sketched. For obtaining a quantum distribution, it is crucial to stick with a discrete energy spectrum and to make the limit transitions to infinity at the right place. For correct state counting, the concept of interchangeability of particles is superior to that of indistinguishability.}, language = {en} } @misc{HarendtBeyerRolle2002, author = {Harendt, Andreas and Beyer, Harald and Rolle, Siegfried}, title = {Die n{\"a}herungsweise L{\"o}sung der elektrostatischen Aufgabe mit der Finite - Element - Methode zur Modellierung behinderter elektrischer Entladungen}, series = {Wissenschaftliche Beitr{\"a}ge 2002}, volume = {7}, journal = {Wissenschaftliche Beitr{\"a}ge 2002}, issn = {0949-8214}, doi = {10.15771/0949-8214_2002_4}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-6852}, pages = {15 -- 24}, year = {2002}, abstract = {Es wird erl{\"a}utert, warum man mit der Finite-Element-Methode (FEM) das elektrostatische Problem mit Grenzfl{\"a}chen und darauf befindlichen Fl{\"a}chenladungen prinzipiell nicht l{\"o}sen kann. Es werden dann Verfahren entwickelt, dies n{\"a}herungsweise zu tun. Anschließend wird eine Methode entwickelt, die es gestattet, aus den so erhaltenen L{\"o}sungen n{\"a}herungsweise konsistent auf die Ausgangsgleichungen zur{\"u}ckzurechnen und so den Driftterm der Kontinuit{\"a}tsgleichung f{\"u}r die hydrodynamische Modellierung einer Gasentladung zu ermitteln.}, language = {de} } @misc{Marx2011, author = {Marx, Mathias}, title = {Untersuchung von bipolaren Vakuumb{\"o}gen auf Erste-Wand-Materialien}, doi = {10.15771/DA_2011_1}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus-1687}, pages = {77}, year = {2011}, abstract = {Die vorliegende Arbeit untersucht bipolare Vakuumb{\"o}gen auf Erste-Wand-Materialien von Fusionsreaktoren.}, language = {de} } @misc{Tolkiehn1976, author = {Tolkiehn, G{\"u}nter-Ulrich}, title = {Untersuchung der Lumineszenz von festem Xenon mit Hilfe von Emissions- und Anregungsspektroskopie im Temperaturbereich von 5K bis 75K}, doi = {10.15771/DA_1976_1}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus-1745}, pages = {59}, year = {1976}, abstract = {Verschiedene Eigenschaften der Emissions- und Anregungsspektren von festem Xenon wurden im Detail untersucht. Wesentliche Aspekte konnten gut mit Hilfe der Vorstellung der Diffusionsbewegung des freien n=1-Exzitons und dessen strahlungsloser Rekombination an Restgasatomen auf der Probenoberfl{\"a}che erkl{\"a}rt werden. Eine wesentliche {\"A}nderung des Emissionsspektrums bei h{\"o}heren Temperaturen konnte dokumentiert, jedoch mit Hilfe der bekannten Modelle nicht erkl{\"a}rt werden.}, subject = {Exziton}, language = {de} } @article{ShamsSchmitzSmekhovaetal.2021, author = {Shams, S. Fatemeh and Schmitz, Detlef and Smekhova, Alevtina and Ghazanfari, Mohammad Reza and Giesen, Margret and Weschke, Eugen and Chen, Kai and Luo, Chen and Radu, Florin and Schmitz-Antoniak, Carolin}, title = {Element-specific contributions to improved magnetic heating of theranostic CoFe2O4 nanoparticles decorated with Pd}, series = {Scientific Reports}, volume = {11}, journal = {Scientific Reports}, issn = {2045-2322}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-14756}, year = {2021}, abstract = {Decoration with Pd clusters increases the magnetic heating ability of cobalt ferrite (CFO) nanoparticles by a factor of two. The origin of this previous finding is unraveled by element-specific X-ray absorption spectroscopy (XAS) and magnetic circular dichroism (XMCD) combined with atomic multiplet simulations and density functional theory (DFT) calculations. While the comparison of XAS spectra with atomic multiplet simulations show that the inversion degree is not affected by Pd decoration and, thus, can be excluded as a reason for the improved heating performance, XMCD reveals two interrelated responsible sources: significantly larger Fe and Co magnetic moments verify an increased total magnetization which enhances the magnetic heating ability. This is accompanied by a remarkable change in the field-dependent magnetization particularly for Co ions which exhibit an increased low-field susceptibility and a reduced spin canting behavior in higher magnetic fields. Using DFT calculations, these findings are explained by reduced superexchange between ions on octahedral lattice sites via oxygen in close vicinity of Pd, which reinforces the dominating antiparallel superexchange interaction between ions on octahedral and tetrahedral lattice sites and thus reduces spin canting. The influence of the delocalized nature of Pd 4d electrons on the neighboring ions is discussed and the conclusions are illustrated with spin density isosurfaces of the involved ions. The presented results pave the way to design nanohybrids with tailored electronic structure and magnetic properties.}, language = {en} } @inproceedings{MetzlerVandenhoutenKroneetal.1998, author = {Metzler, Volker H. and Vandenhouten, Ralf and Krone, J{\"o}rg and Grebe, Reinhard}, title = {Unsupervised image segementation by stochastic reconstruction}, series = {Proceedings of SPIE}, volume = {3338}, booktitle = {Proceedings of SPIE}, issn = {1996-756X}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-9329}, year = {1998}, abstract = {To segment complex and versatile image data from different modalities it is almost impossible to achieve satisfying results without the consideration of contextual information. In this approach, image segmentation is regarded as a high- dimensional optimization task, that can be solved by stochastical methods like evolutionary algorithms (EA). Initially, the iterative algorithm is provided with a set of good-quality sample segmentations. An efficient EA-based learning strategy generates a segmentation for a given target image from the provided samples. This two-level process consists of a global image-based optimization whose convergence is enhanced by locally operating pixel-based Boltzmann processes which restrict the search space to reasonable subsets. The stochastic reconstruction extracts the relevant information from the samples in order to adapt it onto the current segmentation problem, which results in a consistent labeling for the target image. The algorithm works unsupervised, because the range of possible labels and their contextual interpretation is provided implicitly by the sample segmentations. To prove the usefulness of the method experimental results based on both, reproducible phantom images and physiological NMR scans are presented. Moreover, an analysis of the basic segmentation and convergence properties is provided.}, language = {en} }