@article{25918, abstract = {{Characterization and application of (meso)porous materials often require information about the density of the respective samples. For example, the BET surface area is, by definition, normalized to the sample mass; hence, any comparison between samples of different composition needs to take into account their respective densities. Literature data on the densities of porous materials are scarce. Frequently, only bulk-phase densities are available which sometimes differ from those of porous samples, especially for amorphous systems, such as silica or carbon. The apparent density, i.e. the density of the sample excluding the gas-accessible pore volume, is typically determined by helium gas pycnometry utilizing specialized pycnometers. We demonstrate how to obtain the same data from standard N2 physisorption measurements as part of the regular measurement routine. We evaluate the method by reference measurements utilizing a non-porous reference sample (glass rod) to confirm the validity of the method. Then we present results on apparent density measurements of several mesoporous silica materials (MCM-41, MCM-48, SBA-15, KIT-6), mesoporous carbon (CMK-3, -5, -8, -9), and a variety of mesoporous metal oxides obtained by nanocasting.}}, author = {{Weinberger, Christian and Vetter, Simon and Tiemann, Michael and Wagner, Thorsten}}, issn = {{1387-1811}}, journal = {{Microporous and Mesoporous Materials}}, pages = {{53--57}}, title = {{{Assessment of the density of (meso)porous materials from standard volumetric physisorption data}}}, doi = {{10.1016/j.micromeso.2015.10.027}}, year = {{2016}}, } @article{42893, abstract = {{The influences of geometrical parameters like adhesive layer thickness and gap-filling on the mechanical properties of adhesively bonded joints are investigated by means of experimental studies with controlled parameter variations. In addition, corresponding simulation models are used to analyse these effects. As a result, the behaviour of joints under variation of manufacturing parameters can be reproduced with high accuracy. Furthermore, the validated simulation models are used to perform sensitivity analysis on a component-like specimen. Based on these studies, tolerance ranges can be specified and robust design optimisation can be carried out.}}, author = {{Schwarzkopf, G. and Bobbert, Mathias and Teutenberg, Dominik and Meschut, Gerson and Matzenmiller, A.}}, issn = {{2212-8271}}, journal = {{Procedia CIRP}}, keywords = {{General Medicine}}, pages = {{321--326}}, publisher = {{Elsevier BV}}, title = {{{Tolerance Analysis of Adhesive Bonds in Crash Simulation}}}, doi = {{10.1016/j.procir.2016.02.151}}, volume = {{43}}, year = {{2016}}, } @inbook{43038, author = {{Matzner, Tobias}}, booktitle = {{Prävention und Freiheit. Zur Notwendigkeit eines Ethik-Diskurses. Gutachten für den 21. Deutschen Präventionstag am 6./7. Juni 2016 in Magdeburg}}, editor = {{Ammicht Quinn, Regina}}, title = {{{Videoüberwachung als Instrument der Prävention?}}}, year = {{2016}}, } @misc{42935, author = {{Matzner, Tobias}}, booktitle = {{Medium.com}}, title = {{{Neither platform nor media company. Popping a filter bubble is not that easy}}}, year = {{2016}}, } @misc{42936, author = {{Matzner, Tobias}}, booktitle = {{Medium.com}}, title = {{{Grasping the ethics and politics of algorithms}}}, year = {{2016}}, } @inbook{42915, author = {{Matzner, Tobias}}, booktitle = {{Technisierte Lebenswelt – Über den Prozess der Figuration von Mensch und Technik}}, editor = {{Adam, Marie-Hélèn and Gellai, Szilvia and Knifka, Julia}}, pages = {{227--242}}, publisher = {{transcript}}, title = {{{Personen verwalten oder Personen sein (müssen)? Normen der Privatheit (nicht nur) in der digitalen Kommunikation}}}, year = {{2016}}, } @inbook{42917, author = {{Matzner, Tobias}}, booktitle = {{Handbuch Informations- und Medienethik}}, editor = {{Heesen, Jessica}}, publisher = {{Verlag J.B. Metzler}}, title = {{{Anonymität}}}, year = {{2016}}, } @article{42889, author = {{Matzner, Tobias}}, journal = {{Surveillance & Society 14 Nr.2}}, pages = {{197--210}}, title = {{{Beyond data as representation: The performativity of Big Data in surveillance}}}, year = {{2016}}, } @inbook{28152, author = {{Matzner, Tobias and Masur, Philipp K and Ochs, Carsten and von Pape, Thilo}}, booktitle = {{Data Protection on the Move – Current Developments in ICT and Privacy/Data Protection}}, editor = {{Gutwirth, Serge and De Hert, Paul and Leenes, Ronald}}, pages = {{277--305}}, publisher = {{Springer}}, title = {{{Do-It-Yourself Data Protection—Empowerment or Burden?}}}, year = {{2016}}, } @inproceedings{39476, author = {{Romero, Adrian and Gonzalez, Jesus and Hilleringmann, Ulrich and Gloesekoetter, Peter}}, booktitle = {{ANALOG 2016; 15. ITG/GMM-Symposium}}, pages = {{1--6}}, title = {{{Organic Field-Effect and Nanoparticle Thin-Film Transistors: Static Model}}}, year = {{2016}}, } @inproceedings{39480, author = {{Vidor, F. F. and Meyers, T. and Hilleringmann, Ulrich and Wirth, G. I.}}, booktitle = {{2015 IEEE 15th International Conference on Nanotechnology (IEEE-NANO)}}, publisher = {{IEEE}}, title = {{{Influence of UV irradiation and humidity on a low-cost ZnO nanoparticle TFT for flexible electronics}}}, doi = {{10.1109/nano.2015.7388836}}, year = {{2016}}, } @inproceedings{39478, author = {{Hangmann, C and Mager, T and Khan, S and Hedayat, C and Hilleringmann, Ulrich}}, booktitle = {{Smart System Integration-International Conference and Exhibition on Integration Issues of Miniaturized Systems}}, title = {{{Improved rf design using precise 3d near-field measurements and near-field to far-field transformations}}}, year = {{2016}}, } @article{39456, author = {{Hett, T. and Krämmer, S. and Hilleringmann, Ulrich and Kalt, H. and Zrenner, A.}}, issn = {{0022-2313}}, journal = {{Journal of Luminescence}}, keywords = {{Condensed Matter Physics, Biochemistry, General Chemistry, Atomic and Molecular Physics, and Optics, Biophysics}}, pages = {{131--134}}, publisher = {{Elsevier BV}}, title = {{{High-Q whispering gallery microdisk resonators based on silicon oxynitride}}}, doi = {{10.1016/j.jlumin.2016.11.016}}, volume = {{191}}, year = {{2016}}, } @article{42901, author = {{Rolf, Carolin and Shnayien, Marie-Luise}}, journal = {{onlinejournal kultur & geschlecht}}, number = {{17}}, pages = {{1--19}}, title = {{{Geruchswahrnehmung aus der Luft ist meines Wissens nach gestattet.‘ Daten, Drohnen, Drogenfahndung am Beispiel des Cannachoppers}}}, year = {{2016}}, } @article{35169, abstract = {{Big Data als Technik und Analyseinstrument gesellschaftlicher und ökonomischer Zusammenhänge dringt in weite Bereiche des Alltags vor, obgleich die Folgen dieser neuen Technik noch nicht absehbar sind. In diesem Zusammenhang gewinnen auch Drohnen als unterstützender Teil polizeilicher Ermittlungsverfahren immer mehr an Bedeutung. Eine dieser Drohnen ist der Cannachopper, der, begünstigt durch eine Gesetzeslücke, im April 2009 von der niederländischen Polizei eingesetzt wurde, um illegale Hanfplantagen ausfindig zu machen. Der Artikel kann als Ergänzung zum im Anhang befindlichen Skript des gleichnamigen Radiofeatures gelesen werden und situiert den Cannachopper in einem Gefüge aus Begehren und Wünschen nach Sicherheit, effizienter und kostengünstiger Polizeiarbeit und der Dystopie von totaler Überwachung.}}, author = {{Rolf, Carolin and Shnayien, Mary}}, journal = {{onlinejournal kultur & geschlecht}}, number = {{17}}, pages = {{1–19}}, title = {{{„Geruchswahrnehmung aus der Luft ist meines Wissens nach gestattet.“ Daten, Drohnen, Drogenfahndung am Beispiel des Cannachoppers}}}, year = {{2016}}, } @misc{43454, abstract = {{Die Gitter von Klassenzahl eins oder zwei sind hier verfügbar: http://www.math.rwth-aachen.de/~Markus.Kirschmer/forms/}}, author = {{Kirschmer, Markus}}, pages = {{166}}, title = {{{Definite quadratic and hermitian forms with small class number (Habilitation)}}}, year = {{2016}}, } @article{22942, abstract = {{A microscopic approach that is based on the multisubband semiconductor Bloch equations formulated in the basis of a 14-band k⋅p model is employed to compute the temporal dynamics of photocurrents in GaAs quantum wells following excitation with femtosecond laser pulses. This approach provides a transparent description of the interband, intersubband, and intraband excitations, fully includes all resonant as well as off-resonant excitations, and treats the light-matter interaction nonperturbatively. For linearly polarized excitations, the photocurrents contain contributions from shift and rectification currents. We numerically compute and analyze these currents generated by excitation with femtosecond laser pulses for [110]- and [111]-oriented GaAs quantum wells. It is shown that the often employed perturbative χ(2) approach breaks down for peak fields larger than about 10 kV/cm, and that nonperturbative effects lead to a reduction of the peak values of the shift and rectification currents and to temporal oscillations that originate from Rabi flopping. In particular, we find a complex oscillatory photon energy dependence of the magnitudes of the shift and rectification currents. Our simulations demonstrate that this dependence is the result of mixing between the heavy- and light-hole valence bands. This is a surprising finding since the band mixing has an even larger influence on the strength of the photocurrents than the absorption coefficient. For [110]-oriented GaAs quantum wells, the calculated photon energy dependence is compared to experimental results, and good agreement is obtained. This validates our theoretical approach.}}, author = {{Duc, Huynh Thanh and Podzimski, Reinold and Priyadarshi, Shekhar and Bieler, Mark and Meier, Torsten}}, issn = {{2469-9950}}, journal = {{Physical Review B}}, number = {{8}}, publisher = {{American Physical Society}}, title = {{{Ultrafast shift and rectification photocurrents in GaAs quantum wells: Excitation intensity dependence and the importance of band mixing}}}, doi = {{10.1103/physrevb.94.085305}}, volume = {{94}}, year = {{2016}}, } @article{13916, abstract = {{Nonlinearity is the driving force for numerous important effects in nature typically showing transitions between different regimes, regular, chaotic or catastrophic behavior. Localized nonlinear modes have been the focus of intense research in areas such as fluid and gas dynamics, photonics, atomic and solid state physics etc. Due to the richness of the behavior of nonlinear systems and due to the severe numerical demands of accurate three-dimensional (3D) numerical simulations presently only little knowledge is available on the dynamics of complex nonlinear modes in 3D. Here, we investigate the dynamics of 3D non-coaxial matter wave vortices that are trapped in a parabolic potential and interact via a repulsive nonlinearity. Our numerical simulations demonstrate the existence of an unexpected and fascinating nonlinear regime that starts immediately when the nonlinearity is switched-on and is characterized by a smooth dynamics representing torque-free precession with nutations. The reported motion is proven to be robust regarding various effects such as the number of particles, dissipation and trap deformations and thus should be observable in suitably designed experiments. Since our theoretical approach, i.e., coupled nonlinear Schrödinger equations, is quite generic, we expect that the obtained novel dynamical behavior should also exist in other nonlinear systems.}}, author = {{Driben, R. and Konotop, V. V. and Meier, Torsten}}, issn = {{2045-2322}}, journal = {{Scientific Reports}}, title = {{{Precession and nutation dynamics of nonlinearly coupled non-coaxial three-dimensional matter wave vortices}}}, doi = {{10.1038/srep22758}}, volume = {{6}}, year = {{2016}}, } @article{13920, abstract = {{We investigate the transient optical response in high-quality Cd0.88Zn0.12Te crystals in the regime of slow light propagation on the lower exciton-polariton branch. Femtosecond photoexcitation leads to very substantial transmission changes in a ∼10-meV broad spectral range within the transparency window of the unexcited semiconductor. These nonlinear optical signatures decay on picosecond time scales governed by carrier thermalization and recombination. The temporal and spectral dependence indicate the dynamical optical response as arising from excitation-induced dephasing and perturbed free induction decay. Model simulations for the optical response taking into account the actual exciton-polariton dispersion and excitation-induced dephasing of a nonlinearly driven two-level system support this interpretation.}}, author = {{Lohrenz, J. and Melzer, S. and Ruppert, C. and Akimov, I. A. and Mariette, H. and Reichelt, Matthias and Trautmann, Alexander and Meier, Torsten and Betz, M.}}, issn = {{2469-9950}}, journal = {{Physical Review B}}, number = {{7}}, title = {{{Ultrafast dynamical response of the lower exciton-polariton branch in CdZnTe}}}, doi = {{10.1103/physrevb.93.075201}}, volume = {{93}}, year = {{2016}}, } @inbook{43938, author = {{Schroeter-Wittke, Harald and Altuchov, Katharina and Armbruster, Ann-Kathrin and Isaak, Vitalij and Janus, Richard and Kling, Malte and Meßollen, Sophie-Katherin}}, booktitle = {{95 Thesen JETZT. Ein Bildungsbuch}}, editor = {{Hermann, Stefan and Leonhard, Silke and Schreiner, Peter and Schroeter-Wittke, Harald and Teckemeyer, Lothar}}, pages = {{61--64}}, title = {{{Satisfaction (These 31-35)}}}, year = {{2016}}, }