@article{SchmidtKroegerFlegeetal., author = {Schmidt, Thomas and Kr{\"o}ger, Roland and Flege, Jan Ingo and Horn-von Hoegen, Michael and Clausen, T. and Falta, J. and Janzen, Andreas and Zahl, P. and Kury, P. and Kammler, Martin}, title = {Less strain energy despite fewer misfit dislocations: the impact of ordering}, series = {Physical review letters}, volume = {96}, journal = {Physical review letters}, number = {6}, publisher = {APS}, doi = {10.1103/PhysRevLett.96.066101}, abstract = {The average strain state of Ge films grown on Si(111) by surfactant mediated epitaxy has been compared to the ordering of the interfacial misfit dislocation network. Surprisingly, a smaller degree of average lattice relaxation was found in films grown at higher temperature. On the other hand, these films exhibit a better ordered dislocation network. This effect energetically compensates the higher strain at higher growth temperature, leading to the conclusion that, apart from the formation of misfit dislocations, their ordering represents an important channel for lattice-strain energy relaxation.}, language = {en} } @inproceedings{BaeumlHaumerKapelleretal., author = {B{\"a}uml, T. and Haumer, Anton and Kapeller, Hansj{\"o}rg and Starzinger, J. and Farzi, P.}, title = {Impact of inverter pulse inhibition on the high-voltage supply system of an electric vehicle — A simulative approach}, series = {2011 IEEE Vehicle Power and Propulsion Conference (VPPC 2011) : Powering sustainable transportation ; Chicago, Illinois, USA, 06. - 09.09.2011}, booktitle = {2011 IEEE Vehicle Power and Propulsion Conference (VPPC 2011) : Powering sustainable transportation ; Chicago, Illinois, USA, 06. - 09.09.2011}, publisher = {IEEE}, address = {Piscataway, NJ}, isbn = {978-1-61284-248-6}, doi = {10.1109/VPPC.2011.6043159}, pages = {1 -- 5}, abstract = {This paper deals with a simulative approach for investigating the impact of inverter pulse inhibition during field weakening operation of permanent magnet synchronous machines and asynchronous induction machines. The modelling and simulation language Modelica is used to design models for the vehicle, the electric machine and the inverter in different abstraction levels. It is shown that when using a permanent magnet synchronous machine, a sudden breakdown of the field weakening current causes induction of high voltages in the stator windings. Hence, the electric system of the vehicle has to be protected against the resulting high currents. Furthermore precautions have to be taken to avoid dangerous driving conditions because of high braking torques in an inverter fault operation mode. In the case of the asynchronous induction machine an inverter pulse inhibition poses no big problem, neither for the electric system of the vehicle, nor the driver.}, language = {en} } @incollection{Rudolph, author = {Rudolph, Clarissa}, title = {Vergeschlechtlichungsprozesse im SGB II und gleichstellungspolitische Interventionen}, series = {Grundsicherung und Geschlecht : Gleichstellungspolitische Befunde zu den Wirkungen von Hartz IV}, booktitle = {Grundsicherung und Geschlecht : Gleichstellungspolitische Befunde zu den Wirkungen von Hartz IV}, editor = {Jaehrling, Karen and Rudolph, Clarissa}, publisher = {Westf{\"a}lisches Dampfboot}, address = {M{\"u}nster}, isbn = {978-3-89691-866-6}, pages = {57 -- 70}, subject = {Deutschland}, language = {de} } @article{HullGrayKammleretal., author = {Hull, Robert and Gray, J. L. and Kammler, Martin and Vandervelde, T. and Kobayashi, Takeshi and Kumar, P. and Pernell, T. and Bean, J. C. and Floro, J. A. and Ross, Frances M.}, title = {Precision placement of heteroepitaxial semiconductor quantum dots}, series = {Materials Science and Engineering: B}, volume = {101}, journal = {Materials Science and Engineering: B}, number = {1-3}, publisher = {Elsevier}, doi = {10.1016/S0921-5107(02)00680-3}, pages = {1 -- 8}, abstract = {We describe two new approaches to the patterning of Si(1 0 0) surfaces for controlled nucleation of heteroepitaxial Ge semiconductor clusters. In the first method, a Ga ' -focused ion beam in situ to the growth chamber is used to create local regions of enhanced Ga ' concentration and surface topography. It is shown that at low ion doses ({\^A}/10 14 cm (2), implanted Ga causes local nucleation of Ge clusters upon the implanted region. At higher doses (]/10 15 cm (2), a complex surface topography localizes nucleation of Ge clusters. This approach can be used to seed complex patterns of Ge clusters with diameters of tens of nanometers and positional accuracy of sub-100 nm. The second method employs self-assembly of complex strain-stabilized ''quantum quadruplet'' and ''quantum fortress'' structures, whereby cooperative island nucleation around shallow strain-relieving pits is identified during Ge x Si 1(x /Si(1 0 0) heteroepitaxy. These configurations are kinetically limited structures that exist over a range of compositions, growth temperatures, and growth rates, but which are destabilized by strain relaxation (e.g. by the introduction of misfit dislocations) and by growth conditions which provide high adatom surface mobilities. Both methods have broad potential application to nanoelectronic device architectures. 2003 Elsevier Science B.V. All rights reserved.}, language = {en} } @inproceedings{JungreuthmayerBaumlWinteretal., author = {Jungreuthmayer, C. and Bauml, T. and Winter, O. and Ganchev, M. and Kapeller, Hansj{\"o}rg and Haumer, Anton and Kral, Christian}, title = {Heat and fluid flow analysis of an internal permanent magnet synchronous machine by means of computational fluid dynamics}, series = {2011 IEEE International Electric Machines \& Drives Conference (IEMDC 2011) ; Niagara Falls, Ontario, Canada, 15 - 18 May 2011}, booktitle = {2011 IEEE International Electric Machines \& Drives Conference (IEMDC 2011) ; Niagara Falls, Ontario, Canada, 15 - 18 May 2011}, publisher = {IEEE}, address = {Piscataway, NJ}, isbn = {978-1-4577-0060-6}, doi = {10.1109/IEMDC.2011.5994651}, pages = {515 -- 520}, abstract = {This paper presents a comprehensive computational fluid (CFD) model of a radial flux permanent magnet synchronous machine with interior magnets. In the CFD model the water jacket cooling and a simplified model of the topology of the distributed stator winding are considered. The heat sources of the CFD model are determined from a finite element analysis of the machine. The numerically determined temperature distributions of the machine are compared with measurement results from sensors located both in the stator and rotor. The particular focus of this paper is the analysis of the temperatures and the heat flow in the air gap and from the stator winding head and the rotor to the inner air.}, language = {en} } @article{SchuemannMorichKaufholdetal., author = {Sch{\"u}mann, Malte and Morich, J. and Kaufhold, Tobias and B{\"o}hm, Valter and Zimmermann, Klaus and Odenbach, Stefan}, title = {A mechanical characterisation on multiple timescales of electroconductive magnetorheological elastomers}, series = {Magnetism and Magnetic Materials}, volume = {453}, journal = {Magnetism and Magnetic Materials}, number = {May}, publisher = {Elsevier}, doi = {10.1016/j.jmmm.2018.01.029}, pages = {198 -- 205}, abstract = {Magnetorheological elastomers are a type of smart hybrid material which combines elastic properties of a soft elastomer matrix with magnetic properties of magnetic micro particles. This leads to a material with magnetically controllable mechanical properties of which the magnetorheological effect is the best known. The addition of electroconductive particles to the polymer mix adds electrical properties to the material behaviour. The resulting electrical resistance of the sample can be manipulated by external magnetic fields and mechanical loads. This results in a distinct interplay of mechanical, electrical and magnetic effects with a highly complex time behaviour. In this paper a mechanical characterisation on multiple time scales was conducted to get an insight on the short and long-term electrical and mechanical behaviour of this novel material. The results show a complex resistivity behaviour on several timescales, sensitive to magnetic fields and strain velocity. The observed material exhibits fatigue and relaxation behaviour, whereas the magnetorheological effect appears not to interfere with the piezoresistive properties.}, language = {en} } @article{ShamoninChamonineKlankHagedornetal., author = {Shamonin (Chamonine), Mikhail and Klank, Michael and Hagedorn, Oliver and D{\"o}tsch, Horst}, title = {Magneto-optical visualization of metal-loss defects in a ferromagnetic plate: experimental verification of theoretical modeling}, series = {Applied optics}, volume = {40}, journal = {Applied optics}, number = {19}, publisher = {Optica Publishing Group}, doi = {10.1364/ao.40.003182}, pages = {3182 -- 3189}, abstract = {Rare-earth iron garnet films with in-plane magnetic anisotropy grown on [111]-oriented substrates are promising for the visualization of magnetic leakage fields in nondestructive evaluation. Such magneto-optical films have to be specifically engineered, and we give an example of this technology. To assess the validity and accuracy of finite-element calculations of a magnetization assembly combined with the physical modeling of the image formation, comparisons between calculated and experimentally obtained magneto-optical images of metal-loss defects have been made. A convincing quantitative agreement is demonstrated. It is shown that both physical and computer modeling techniques allow for a predictive engineering design of the prospective applications and provide greater insight into the method.}, language = {en} } @inproceedings{BulendaKnippersSailer, author = {Bulenda, Thomas and Knippers, Jan and Sailer, S.}, title = {Untersuchungen zum Tragverhalten von Netzkuppeln}, series = {Finite Elemente in der Baupraxis : Modellierung, Berechnung und Konstruktion ; Beitr{\"a}ge der Tagung FEM '95 an der Universit{\"a}t Stuttgart am 23. und 24. Februar 1995}, booktitle = {Finite Elemente in der Baupraxis : Modellierung, Berechnung und Konstruktion ; Beitr{\"a}ge der Tagung FEM '95 an der Universit{\"a}t Stuttgart am 23. und 24. Februar 1995}, editor = {Ramm, Ekkehard and Stein, W. and Wunderlich, W.}, publisher = {Ernst}, address = {Berlin}, isbn = {978-3-433-01289-5}, pages = {201 -- 212}, language = {de} } @inproceedings{BulendaKnippersPark, author = {Bulenda, Thomas and Knippers, Jan and Park, D.-U.}, title = {Traglastberechnung von Gitterschalentonnen}, series = {Software f{\"u}r Statik und Konstruktion : Berichte des 9.SOFiSTiK Anwender Seminars, N{\"u}rnberg, Juni 1997}, booktitle = {Software f{\"u}r Statik und Konstruktion : Berichte des 9.SOFiSTiK Anwender Seminars, N{\"u}rnberg, Juni 1997}, editor = {Katz, Casimir and Protopsaltis, Byron}, isbn = {9789054109549}, pages = {437 -- 460}, language = {de} } @misc{KellnerUtz, author = {Kellner, Florian and Utz, Sebastian}, title = {Using Inverse Optimization to Discover Sustainability Priorities in Purchasing Decisions}, series = {International Conference on Operations Research 2023 // 29. Aug. - 01. Sep. 2023, Hamburg}, journal = {International Conference on Operations Research 2023 // 29. Aug. - 01. Sep. 2023, Hamburg}, language = {en} } @misc{SchulzKiessGoedeke, author = {Schulz, Carsten and Kiess, Benjamin and Goedeke, Arne}, title = {Impact of Elasticity on the Transmission Behavior of Thin Ring Gears}, series = {Wind and Drivetrain Conference, 4, 2018, Hamburg}, journal = {Wind and Drivetrain Conference, 4, 2018, Hamburg}, language = {en} } @article{StaabKlenkGalkaetal., author = {Staab, T. and Klenk, Eva Marianne and Galka, Stefan and G{\"u}nthner, Willibald A.}, title = {Efficiency in in-plant milk-run systems - The influence of routing strategies on system utilization and process stability}, series = {Journal of Simulation}, volume = {10}, journal = {Journal of Simulation}, number = {2}, publisher = {Taylor \& Francis}, address = {Abingdon}, issn = {1747-7786}, doi = {10.1057/jos.2015.6}, pages = {137 -- 143}, abstract = {In-plant milk-run systems represent transportation systems, where materials are delivered from a central storage area to several points of use on fixed routes and in short and defined intervals. Milk-run systems generally enable frequent deliveries in low lot sizes with short lead times and low inventories at the points of use. Thus, stable and reliable system operation is crucial to avoid delays and material shortages. In industrial practice, milk-run trains usually share resources, for example, loading areas and technology and use the same tracks, leading to dependencies between routes and possible traffic jams and blockages, which significantly affect cycle times and may lead to instabilities in the system. We present a simulation model to analyse in-plant milk-run systems with a focus on typical traffic situations. We describe its application to a large industrial case study in detail and derive recommendations for designing routes with low risk of delays.}, language = {en} } @article{KlankHagedornHolthausetal., author = {Klank, Michael and Hagedorn, Oliver and Holthaus, Carsten and Shamonin (Chamonine), Mikhail and D{\"o}tsch, Horst}, title = {Characterization and optimization of magnetic garnet films for magneto-optical visualization of magnetic field distributions}, series = {NDT \& E International}, volume = {36}, journal = {NDT \& E International}, number = {6}, publisher = {Elsevier}, doi = {10.1016/S0963-8695(03)00012-4}, pages = {375 -- 381}, abstract = {Rare-earth iron garnet films with in-plane anisotropy grown on (111)-oriented substrates can be used as magneto-optical indicator films for visualization of magnetic leakage fields in nondestructive evaluation. The influence of Faraday rotation, Faraday ellipticity, absorption and film thickness on the performance of a magneto-optical indicator film is investigated. A new optimization method is introduced and compared with the method of contrast optimization. The theory is experimentally verified and an application example is presented.}, language = {en} } @article{ShamoninChamonineBeukerRosenetal., author = {Shamonin (Chamonine), Mikhail and Beuker, T. and Rosen, P. and Klank, Michael and Hagedorn, Oliver and D{\"o}tsch, Horst}, title = {Feasibility of magneto-optic flaw visualization using thin garnet films}, series = {NDT \& E International}, volume = {33}, journal = {NDT \& E International}, number = {8}, publisher = {Elsevier}, doi = {10.1016/s0963-8695(00)00028-1}, pages = {547 -- 553}, abstract = {We investigate the feasibility of using rare-earth iron garnet films grown on (111)-oriented substrates as magneto-optic indicator films for the visualization of magnetic leakage fields in non-destructive evaluation. In most cases the leakage field of the defect has a strong component in the film plane. The influence of this in-plane dc magnetic field on the image formation is investigated. It is shown that the presence of a strong in-plane magnetic field allows one to extend the dynamic range of the out-of-plane field imposed by the uniaxial anisotropy field HA. On the other hand, an in-plane field reduces the sensitivity. The guidelines for selecting parameters of magneto-optic indicator films are given.}, language = {en} } @article{KlankHagedornShamoninChamonineetal., author = {Klank, Michael and Hagedorn, Oliver and Shamonin (Chamonine), Mikhail and Rosen, H. and D{\"o}tsch, Horst}, title = {Sensitive magneto-optical sensors for visualization of magnetic fields using garnet films of specific orientations}, series = {Journal of Applied Physics}, volume = {92}, journal = {Journal of Applied Physics}, publisher = {AIP}, doi = {10.1063/1.1516839}, abstract = {Garnet films of high Faraday rotation are applied as magneto-optical sensors to visualize the spatial distribution of magnetic fields. Using specific orientations, the induced anisotropy can generate an easy plane of magnetization which is inclined with respect to the film plane. If the magnetization lies in this plane a very high sensitivity can be achieved. The dependence of the geometrical orientation of the easy plane on the growth direction is calculated and the sensitivity and dynamic range are derived. Experimental results of a [112] oriented garnet film are in good agreement with calculations.}, language = {en} } @article{ZimmermannBoehmBeckerTIetal., author = {Zimmermann, Klaus and B{\"o}hm, Valter and Becker T.I., and Chavez Vega, Jhohan Harvey and Kaufhold, Tobias and Monkman, Gareth J. and Sindersberger, Dirk and Diermeier, Andreas and Prem, Nina}, title = {Mechanical Characterization of the Field-Dependent Properties of Magnetoactive Polymers and Integrated Electrets for their Application in Soft Robotics}, series = {International Scientific Journal "Problems of Mechanics"}, volume = {69}, journal = {International Scientific Journal "Problems of Mechanics"}, number = {4}, issn = {1512-0740}, language = {en} } @misc{Kellner, author = {Kellner, Florian}, title = {Multi-objective supplier portfolio configuration under supply risk and sustainability considerations}, series = {International Conference on Operations Research (OR2017), September 2017, Berlin}, journal = {International Conference on Operations Research (OR2017), September 2017, Berlin}, language = {en} } @incollection{SchliermannAnneken, author = {Schliermann, Rainer and Anneken, Volker}, title = {Einfach Fußball - ein inklusionsbezogenes und gesundheitsp{\"a}dagogisches Gemeinschaftsprojekt von Bayer und Deutschem Fußball-Bund}, series = {Kinder bewegen - wissenschaftliche Energien b{\"u}ndeln, 16.-17.02.2011, Karlsruhe}, booktitle = {Kinder bewegen - wissenschaftliche Energien b{\"u}ndeln, 16.-17.02.2011, Karlsruhe}, editor = {Woll, A. and B{\"o}s, K. and Huber, G. and Kemper, Reinhild and Knoll, Michaela Beate and Pahmeier, I. and Sudeck, R. and Vogt, L. and Spengler, S. and Peterhans, E.}, publisher = {KIT}, address = {Karlsruhe}, pages = {52}, language = {de} } @inproceedings{GoedekeSchulzGrussetal., author = {Goedeke, Arne and Schulz, Carsten and Gruss, H. and Kieß, Benjamin}, title = {Structural Health Monitoring auf Basis sich ver{\"a}ndernder Strukturdehnungen an Br{\"u}ckentr{\"a}gern}, series = {Der Kran - Leistungssteigerung, Leichtbau und Automatisierung : 27. Internationale Kranfachtagung 2019 : Begleitband zur Kranfachtagung am 07. M{\"a}rz 2019 in Bochum}, booktitle = {Der Kran - Leistungssteigerung, Leichtbau und Automatisierung : 27. Internationale Kranfachtagung 2019 : Begleitband zur Kranfachtagung am 07. M{\"a}rz 2019 in Bochum}, publisher = {Selbstverlag der Ruhr-Universit{\"a}t Bochum}, isbn = {3-89194-226-5}, language = {de} } @inproceedings{KellnerOttoBusch, author = {Kellner, Florian and Otto, Andreas and Busch, Andreas}, title = {Distribution Networks - Rigid Investments In Dynamic Environments}, series = {Flexibility and adaptability of global supply chains - Proceedings of the 7th German-Russian Logistics Workshop (DR-LOG 2012)}, booktitle = {Flexibility and adaptability of global supply chains - Proceedings of the 7th German-Russian Logistics Workshop (DR-LOG 2012)}, editor = {Ivanov, Dimitri and Sokolov, Boris and K{\"a}schel, Joachim}, address = {Sankt Petersburg}, pages = {103 -- 111}, language = {en} } @misc{Kellner, author = {Kellner, Florian}, title = {Visual decision support for the multi-objective supplier selection problem}, series = {International Conference on Multiple Objective Programming and Goal Programming (MOPGP), 30-31 October 2017, Metz, France}, journal = {International Conference on Multiple Objective Programming and Goal Programming (MOPGP), 30-31 October 2017, Metz, France}, language = {en} } @misc{KellnerUtz, author = {Kellner, Florian and Utz, Sebastian}, title = {Exploring Sustainability Priorities in Purchasing Decisions Based on Inverse Optimization}, series = {NAMA Conference 2023, 28.-29. Sep. 2023, Oldenburg}, journal = {NAMA Conference 2023, 28.-29. Sep. 2023, Oldenburg}, language = {en} }