@article{26109, abstract = {{Temperature effects in the polymer laser sintering process are an important aspect regarding the process reproducibility and part quality. Depending on the job layout and position within the part cake, individual temperature histories occur during the process. Temperature history dependent effects are for example part warpage, the crystallization rate and powder ageing effects. This work focuses on temperatures and heat flow within laser sintered part cakes. Therefore, a thermal Finite Element (FE) model of a part cake is developed based on experimental in-process temperature measurements. Thermal boundary conditions and properties of the used bulk polymer powder are analyzed and relevant parameters are identified. The model is validated and optimized considering different job heights and ambient conditions during the cooling phase. It is finally possible to predict position-dependent temperature histories as a function of significant job parameters. The model allows a transfer of the results for varied boundary conditions during cooling. In combination with an implementation of built parts, this model will be an important tool for the development of optimized process controls and cooling strategies.}}, author = {{Josupeit, Stefan and Ordia, Lavish and Schmid, Hans-Joachim}}, issn = {{2214-8604}}, journal = {{Additive Manufacturing}}, pages = {{189--196}}, title = {{{Modelling of temperatures and heat flow within laser sintered part cakes}}}, doi = {{10.1016/j.addma.2016.06.002}}, year = {{2016}}, } @article{26111, abstract = {{The shape and fracture of the free surface frequently limits the measuring range and impedes the use of optical velocimetric techniques in parallel plate and cone plate setups. To prevent this, various kinds of edge guards are often employed. In the present study, we elucidate how an edge guard distorts the steady velocity profile in a parallel plate setup. To this end, we analyzed the velocity field of a strongly shear-thinning fluid, a Newtonian fluid and a set of suspensions via particle image velocimetry in a parallel plate device. Several guard ring sizes were studied. The distortion is described by a simple three parameter model. These parameters are mostly constant for different fluids and suspensions with particle volume fractions below 45%. With increasing radius, the guard ring.s influence approaches a limiting value that we attribute to the influence of the fluid surrounding the gap. Our results indicate a limiting ratio of the difference between plate radius and guard to gap size that should always be exceeded. In the presence of a guard ring, even Newtonian fluids do not exhibit a constant shear rate for most radial distances within the gap. This distortion of the velocity field challenges the simple superposition approach of unguarded device and guard influence that is prevalent in the literature.}}, author = {{Schmid, Hans-Joachim and Pieper, S.}}, journal = {{Applied Rheology}}, title = {{{Guard ring induced distortion of the steady velocity profile in a parallel plate rheometer}}}, doi = {{10.3933/APPLRHEOL-26-64533}}, year = {{2016}}, } @article{26118, abstract = {{Suspensions are subject to confinement induced structuring, i.e. layering, at the confining surfaces. While most of the previous work focused on layering in Couette cells, the present study aimed to characterize the resulting layers at the plates of a parallel plate rheometer with regard to their relative particle concentration. The particle concentration profile over the radial distance was characterized for various mean concentrations and gap heights. To this end, we mapped the distribution of fluorescently dyed tracer particles in density and refractive index matched suspensions. The results indicate that layering at the surfaces stabilizes as the ratio between gap height and particle diameter increases. For lower gap heights, i.e. as the suspension approaches a two dimensional state, the layer concentration was non-uniform over the plates. In general, results were quantitatively different for the upper and lower plate and the concentration profiles were noticeably asymmetric. We conclude that this is probably the result of the rheometer loading or the start-up process. The stable layers as well as the inhomogeneous particle distribution in general offer an explanation for the lack of transferability of viscosimetric results between different setups.}}, author = {{Pieper, Sven and Schmid, Hans-Joachim}}, issn = {{0377-0257}}, journal = {{Journal of Non-Newtonian Fluid Mechanics}}, pages = {{1--7}}, title = {{{Layer-formation of non-colloidal suspensions in a parallel plate rheometer under steady shear}}}, doi = {{10.1016/j.jnnfm.2016.04.004}}, year = {{2016}}, } @article{2618, author = {{Betz, Stefan}}, journal = {{ForschungsForum Paderborn}}, pages = {{pp. 46--53}}, title = {{{Auswahl internationaler Standorte - Wie lassen sich Standortentscheidungen methodisch unterstützen?}}}, volume = {{19}}, year = {{2016}}, } @article{26236, author = {{Chapman, Robert J. and Santandrea, Matteo and Huang, Zixin and Corrielli, Giacomo and Crespi, Andrea and Yung, Man-Hong and Osellame, Roberto and Peruzzo, Alberto}}, issn = {{2041-1723}}, journal = {{Nature Communications}}, title = {{{Experimental perfect state transfer of an entangled photonic qubit}}}, doi = {{10.1038/ncomms11339}}, year = {{2016}}, } @phdthesis{26239, author = {{Rübbelke, René}}, publisher = {{Verlagsschriftenreihe des Heinz Nixdorf Instituts, Paderborn}}, title = {{{Systematik zur innovationsorientierten Kompetenzplanung}}}, volume = {{350}}, year = {{2016}}, } @phdthesis{26240, author = {{Wall, Marina}}, publisher = {{Verlagsschriftenreihe des Heinz Nixdorf Instituts, Paderborn}}, title = {{{Systematik zur technologie-induzierten Produkt- und Technologieplanung}}}, volume = {{352}}, year = {{2016}}, } @phdthesis{26241, author = {{Cord-Landwehr, Andreas}}, publisher = {{Verlagsschriftenreihe des Heinz Nixdorf Instituts, Paderborn}}, title = {{{Selfish Network Creation - On Variants of Network Creation Games}}}, volume = {{353}}, year = {{2016}}, } @phdthesis{26242, author = {{Anacker, Harald}}, publisher = {{Verlagsschriftenreihe des Heinz Nixdorf Instituts, Paderborn}}, title = {{{Instrumentarium für einen lösungsmusterbasierten Entwurf fortgeschrittener mechatronischer Systeme}}}, volume = {{354}}, year = {{2016}}, } @phdthesis{26244, author = {{Rudtsch, Vinzent}}, publisher = {{Verlagsschriftenreihe des Heinz Nixdorf Instituts, Paderborn}}, title = {{{Methodik zur Bewertung von Produktionssystemen in der frühen Entwicklungsphase}}}, volume = {{355}}, year = {{2016}}, } @phdthesis{26245, author = {{Lehner, Anne-Christin}}, publisher = {{Verlagsschriftenreihe des Heinz Nixdorf Instituts, Paderborn}}, title = {{{Systematik zur lösungsmusterbasierten Entwicklung von Frugal Innovations}}}, volume = {{359}}, year = {{2016}}, } @phdthesis{26254, author = {{Amshoff, Benjamin}}, publisher = {{Verlagsschriftenreihe des Heinz Nixdorf Instituts, Paderborn}}, title = {{{Systematik zur musterbasierten Entwicklung technologie-induzierter Geschäftsmodelle}}}, volume = {{Band 357}}, year = {{2016}}, } @article{26322, author = {{Gerke, S. and Sperling, Jan and Vogel, W. and Cai, Y. and Roslund, J. and Treps, N. and Fabre, C.}}, issn = {{0031-9007}}, journal = {{Physical Review Letters}}, title = {{{Multipartite Entanglement of a Two-Separable State}}}, doi = {{10.1103/physrevlett.117.110502}}, year = {{2016}}, } @article{26323, author = {{Sperling, Jan and Bartley, Tim and Donati, G. and Barbieri, M. and Jin, X.-M. and Datta, A. and Vogel, W. and Walmsley, I. A.}}, issn = {{0031-9007}}, journal = {{Physical Review Letters}}, title = {{{Quantum Correlations from the Conditional Statistics of Incomplete Data}}}, doi = {{10.1103/physrevlett.117.083601}}, year = {{2016}}, } @article{26324, author = {{Bohmann, M. and Semenov, A. A. and Sperling, Jan and Vogel, W.}}, issn = {{2469-9926}}, journal = {{Physical Review A}}, title = {{{Gaussian entanglement in the turbulent atmosphere}}}, doi = {{10.1103/physreva.94.010302}}, year = {{2016}}, } @article{26325, author = {{Sperling, Jan and Vogel, W. and Agarwal, G. S.}}, issn = {{2469-9926}}, journal = {{Physical Review A}}, title = {{{Operational definition of quantum correlations of light}}}, doi = {{10.1103/physreva.94.013833}}, year = {{2016}}, } @article{26326, author = {{Sperling, Jan}}, issn = {{2469-9926}}, journal = {{Physical Review A}}, title = {{{Characterizing maximally singular phase-space distributions}}}, doi = {{10.1103/physreva.94.013814}}, year = {{2016}}, } @article{26327, author = {{Krumm, F. and Sperling, Jan and Vogel, W.}}, issn = {{2469-9926}}, journal = {{Physical Review A}}, title = {{{Multitime correlation functions in nonclassical stochastic processes}}}, doi = {{10.1103/physreva.93.063843}}, year = {{2016}}, } @article{26328, author = {{Bruns, D. and Sperling, Jan and Scheel, S.}}, issn = {{2469-9926}}, journal = {{Physical Review A}}, title = {{{Witnessing random unitary and projective quantum channels: Complementarity between separable and maximally entangled states}}}, doi = {{10.1103/physreva.93.032132}}, year = {{2016}}, } @article{26329, author = {{Heilmann, René and Sperling, Jan and Perez-Leija, Armando and Gräfe, Markus and Heinrich, Matthias and Nolte, Stefan and Vogel, Werner and Szameit, Alexander}}, issn = {{2045-2322}}, journal = {{Scientific Reports}}, title = {{{Harnessing click detectors for the genuine characterization of light states}}}, doi = {{10.1038/srep19489}}, year = {{2016}}, }