TY  - JOUR
A1  - Funke, Harald
A1  - Beckmann, Nils
A1  - Keinz, Jan
A1  - Abanteriba, Sylvester
T1  - Comparison of Numerical Combustion Models for Hydrogen and Hydrogen-Rich Syngas Applied for Dry-Low-Nox-Micromix-Combustion
JF  - Journal of Engineering for Gas Turbines and Power
N2  - The Dry-Low-NOx (DLN) Micromix combustion technology has been developed as low emission combustion principle for industrial gas turbines fueled with hydrogen or syngas. The combustion process is based on the phenomenon of jet-in-crossflow-mixing (JICF). Fuel is injected perpendicular into the air-cross-flow and burned in a multitude of miniaturized, diffusion-like flames. The miniaturization of the flames leads to a significant reduction of NOx emissions due to the very short residence time of reactants in the flame. In the Micromix research approach, computational fluid dynamics (CFD) analyses are validated toward experimental results. The combination of numerical and experimental methods allows an efficient design and optimization of DLN Micromix combustors concerning combustion stability and low NOx emissions. The paper presents a comparison of several numerical combustion models for hydrogen and hydrogen-rich syngas. They differ in the complexity of the underlying reaction mechanism and the associated computational effort. The performance of a hybrid eddy-break-up (EBU) model with a one-step global reaction is compared to a complex chemistry model and a flamelet generated manifolds (FGM) model, both using detailed reaction schemes for hydrogen or syngas combustion. Validation of numerical results is based on exhaust gas compositions available from experimental investigation on DLN Micromix combustors. The conducted evaluation confirms that the applied detailed combustion mechanisms are able to predict the general physics of the DLN-Micromix combustion process accurately. The FGM method proved to be generally suitable to reduce the computational effort while maintaining the accuracy of detailed chemistry.
Y1  - 2018
U6  - http://dx.doi.org/10.1115/1.4038882
SN  - 0742-4795
N1  - Article number 081504;
Paper No: GTP-17-1567
VL  - 140
IS  - 8
PB  - ASME
CY  - New York, NY
ER  - 
TY  - CHAP
A1  - Leise, Philipp
A1  - Simon, Nicolai
A1  - Altherr, Lena
T1  - Comparison of Piecewise Linearization Techniques to Model Electric Motor Efficiency Maps: A Computational Study
T2  - Operations Research Proceedings 2019
N2  - To maximize the travel distances of battery electric vehicles such as cars or buses for a given amount of stored energy, their powertrains are optimized energetically. One key part within optimization models for electric powertrains is the efficiency map of the electric motor. The underlying function is usually highly nonlinear and nonconvex and leads to major challenges within a global optimization process. To enable faster solution times, one possibility is the usage of piecewise linearization techniques to approximate the nonlinear efficiency map with linear constraints. Therefore, we evaluate the influence of different piecewise linearization modeling techniques on the overall solution process and compare the solution time and accuracy for methods with and without explicitly used binary variables.
KW  - MINLP
KW  - Powertrain
KW  - Piecewise linearization
KW  - Efficiency optimization
Y1  - 2020
SN  - 978-3-030-48439-2
SN  - 978-3-030-48438-5
U6  - http://dx.doi.org/10.1007/978-3-030-48439-2_55
N1  - Annual International Conference of the German Operations Research Society (GOR), Dresden, Germany, September 4-6, 2019
SP  - 457
EP  - 463
PB  - Springer
CY  - Cham
ER  - 
TY  - CHAP
A1  - Latzke, Markus
A1  - Alexopoulos, Spiros
A1  - Kronhardt, Valentina
A1  - Rendón, Carlos
A1  - Sattler, Johannes, Christoph
T1  - Comparison of Potential Sites in China for Erecting a Hybrid Solar Tower Power Plant with Air Receiver
T2  - Energy Procedia
Y1  - 2015
U6  - http://dx.doi.org/10.1016/j.egypro.2015.03.142
SN  - 1876-6102
N1  - International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2014, Beijing, China
SP  - 1327
EP  - 1334
ER  - 
TY  - JOUR
A1  - Kern, Alexander
A1  - Thomsen, M.
T1  - Comparison of single point and equipotential bonding for I&C systems of large-area industrial sites
JF  - Volume of proceedings : Budapest, Hungary, September 19-23, 1994 / organized by: Technical University of Budapest
Y1  - 1994
N1  - International Conference on Lightning Protection <22, 1994, Budapest> ; ICLP <22, 1994, Budapest> ; Budapesti M&#369;szaki Egyetem
PB  - Techn. Univ.
CY  - Budapest
ER  - 
TY  - JOUR
A1  - Späte, Frank
A1  - Faber, Christian
A1  - Schwarzer, Klemens
A1  - Hartz, Thomas
T1  - Comparison of solar hot water systems in solar settlements - decentralized or centralized systems?
JF  - Proceedings / organised by: ISES Europe ... [Ed.: Deutsche Gesellschaft für Sonnenenergie e.V. - DGS, Munich ; PSE GmbH - Forschung Entwicklung Marketing, Freiburg]. - Vol. 1
Y1  - 2004
SN  - 3-9809656-1-9
N1  - EuroSun <5, 2004, Freiburg, Breisgau> ; Internationales Sonnenforum <14, 2004, Freiburg, Breisgau> ; Deutsche Gesellschaft für Sonnenenergie
SP  - 1-666-1-671
PB  - PSE
CY  - Freiburg [Breisgau]
ER  - 
TY  - CHAP
A1  - Alexopoulos, Spiros
A1  - Hoffschmidt, Bernhard
A1  - Rau, Christoph
T1  - Comparison of steady-state and transient simulations for solar tower power plants with open-volumetric receiver
T2  - SolarPACES 2011 : concentrating solar power and chemical energy systems : 20 - 23 September, 2011, Granada, Spain
Y1  - 2011
CY  - Granada
ER  - 
TY  - JOUR
A1  - Kern, Alexander
A1  - Roth, J.
A1  - Wiedmann, J.
T1  - Comparison of the damage for various types of fibre reinforced composites due to different lightning test standards (MIL-STD 1757 A, German military VG-standard 96903)
JF  - Proceedings of the 1992 International Aerospace and Ground Conference on Lightning and Static Electricity : October 6-8, 1992, Trump Taj Mahal, Atlantic City, NJ.
Y1  - 1992
N1  - International Conference on Lightning and Static Electricity <1992, Atlantic City, NJ>
PB  - U.S. Dept. of Transportation, Federal Aviation Administration
CY  - [Atlantic City, N.J.]
ER  - 
TY  - JOUR
A1  - Kaminsky, Randolph
A1  - Weber, Hans-Joachim
A1  - Simons, Antoine
A1  - Kallweit, Stephan
A1  - Kramm, K.
A1  - Verdonck, Pascale
T1  - Comparison of the flow downstream two prototypes of a new monoleaflet artificial aortic heart valve by means of PIV visualization
JF  - Computer methods in biomechanics and biomedical engineering. 8 (2005), H. 4, Suppl. 1
Y1  - 2005
SN  - 1476-8259
SP  - 159
EP  - 160
ER  - 
TY  - JOUR
A1  - Koch, Christopher
A1  - Böhnisch, Nils
A1  - Verdonck, Hendrik
A1  - Hach, Oliver
A1  - Braun, Carsten
T1  - Comparison of unsteady low- and mid-fidelity propeller aerodynamic methods for whirl flutter applications
JF  - Applied Sciences
N2  - Aircraft configurations with propellers have been drawing more attention in recent times, partly due to new propulsion concepts based on hydrogen fuel cells and electric motors. These configurations are prone to whirl flutter, which is an aeroelastic instability affecting airframes with elastically supported propellers. It commonly needs to be mitigated already during the design phase of such configurations, requiring, among other things, unsteady aerodynamic transfer functions for the propeller. However, no comprehensive assessment of unsteady propeller aerodynamics for aeroelastic analysis is available in the literature. This paper provides a detailed comparison of nine different low- to mid-fidelity aerodynamic methods, demonstrating their impact on linear, unsteady aerodynamics, as well as whirl flutter stability prediction. Quasi-steady and unsteady methods for blade lift with or without coupling to blade element momentum theory are evaluated and compared to mid-fidelity potential flow solvers (UPM and DUST) and classical, derivative-based methods. Time-domain identification of frequency-domain transfer functions for the unsteady propeller hub loads is used to compare the different methods. Predictions of the minimum required pylon stiffness for stability show good agreement among the mid-fidelity methods. The differences in the stability predictions for the low-fidelity methods are higher. Most methods studied yield a more unstable system than classical, derivative-based whirl flutter analysis, indicating that the use of more sophisticated aerodynamic modeling techniques might be required for accurate whirl flutter prediction.
KW  - Aeroelasticity
KW  - Flutter
KW  - Propeller whirl flutter
KW  - Unsteady aerodynamics
KW  - 1P hub loads
Y1  - 2024
U6  - http://dx.doi.org/10.3390/app14020850
SN  - 2076-3417
VL  - 14
IS  - 2
SP  - 1
EP  - 28
PB  - MDPI
CY  - Basel
ER  - 
TY  - JOUR
A1  - Ley, Wilfried
A1  - Plescher, Engelbert
A1  - Scholz, Artur
A1  - Piepenbrock, Johannes
T1  - COMPASS-1 picosatellite project / Ley, Wilfried ; Plescher, Engelbert ; Scholz, Artur ; Piepenbrock, Johannes
JF  - Small satellites for earth observation : digest of the 6th International symposium of the International Academy of Astronautics, Berlin, April 23 - 26, 2007 / ed. by Rainer Sandau; Hans-Peter Röser; Arnoldo Valenzuela
Y1  - 2007
SN  - 9783896855718
N1  - Symposium on Small Satellites for Earth Observation ; (6, 2007, Berlin)
SP  - 147
EP  - 150
PB  - Wissenschaft und Technik Verl.
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Prume, Klaus
A1  - Roelofs, Andreas
A1  - Schmitz, Thorsten
A1  - Reichenberg, Bernd
T1  - Compensation of the Parasitic Capacitance of a Scanning Force Microscope Cantilever Used for Measurements on Ferroelectric Capacitors of Submicron Size by Means of Finite Element Simulations / Prume, Klaus ; Roelofs, Andreas ; Schmitz, Thorsten ; Reichenb
JF  - Japanese Journal of Applied Physics. 41 (2002), H. 11B
Y1  - 2002
SN  - 0021-4922
SP  - 7198
EP  - 7201
ER  - 
TY  - BOOK
A1  - Faßbender, Heinz
A1  - Gladtz, Katia
A1  - Vogler, Heiko
T1  - Compiler based implementation of syntax directed functional programming
Y1  - 1991
N1  - (Aachener Informatik-Berichte ; 91,10)
PB  - RWTH, Fachgruppe Informatik
CY  - Aachen
ER  - 
TY  - CHAP
A1  - Ferrein, Alexander
A1  - Meeßen, Marcus
A1  - Limpert, Nicolas
A1  - Schiffer, Stefan
ED  - Lepuschitz, Wilfried
T1  - Compiling ROS Schooling Curricula via Contentual Taxonomies
T2  - Robotics in Education
Y1  - 2021
SN  - 978-3-030-67411-3
U6  - http://dx.doi.org/10.1007/978-3-030-67411-3_5
N1  - RiE: International Conference on Robotics in Education (RiE);
Advances in Intelligent Systems and Computing book series (AISC, volume 1316)
SP  - 49
EP  - 60
PB  - Springer
CY  - Cham
ER  - 
TY  - JOUR
A1  - Hoyler, Friedrich
A1  - Shi, Z. R.
A1  - Schreckenback, K.
A1  - Aprahamian, A.
T1  - Complete spectroscopy and the 162Dy nucleus / Z. R. Shi ; K. Schreckenbach ; A. Aprahamian ... F. Hoyler ...
JF  - AIP conference proceedings (1999)
Y1  - 1999
SN  - 0094-243X
N1  - American Institute of Physics conference proceedings
SP  - 237
EP  - 238
ER  - 
TY  - JOUR
A1  - Hoyler, Friedrich
A1  - Aprahamian, A.
A1  - Wu, X.
A1  - Lesher, S. R.
T1  - Complete spectroscopy of the 162Dy nucleus / Aprahamian, A. ; Wu, X. ; Lesher, S. R. ; Warner, D. D. ; Gelletly, W. ; Börner, H. G. ; Hoyler, F. ; Schreckenbach, K. ; Carsten R. F. ; Shi, Z. R. ; Kusnezov, D. ; Ibrahim, M. ; Macchiavelli, A. O. ; Brinkman
JF  - Nuclear physics <Amsterdam> / A. 764 (2006)
Y1  - 2006
SN  - 0375-9474
SP  - 42
EP  - 78
ER  - 
TY  - CHAP
A1  - Hüning, Felix
T1  - Complexity for heterogeneous classes: teaching embedded systems using an open project approach
T2  - Varietas delectat: Complexity is the new normality - 47th Annual Conference, Budapest, Hungary16th - 20th September 2019. SEFI 47th Annual Conference Proceedings
Y1  - 2019
SN  - 978-2-87352-018-2
SP  - 540
EP  - 549
ER  - 
TY  - JOUR
A1  - Starke, Günther
A1  - Kuhne, A.H.
A1  - Frassek, B.
T1  - Components for the automated GMAW process. Bestandteile des automatischen Metall-Schutzgas-Schweissverfahrens
JF  - Welding Journal. 63 (1984), H. 1
Y1  - 1984
SN  - 0043-2296
SP  - 31
EP  - 34
ER  - 
TY  - CHAP
A1  - Dilthey, Ulrich
A1  - Schleser, Markus
ED  - Barroso de Aguiar, Jose
ED  - Jalali, Said
ED  - Camoes, Aires
ED  - Ferrera, Rui Miguel
T1  - Composite improvement of textile reinforced concrete by polymeric impregnation of the textiles
T2  - International Symposium Polymers in Concrete : proceedings of ISPIC 2006, 2-4 April 2006 - University of Minho - Guimarães, Portugal
Y1  - 2006
SN  - 972-99179-1-4
SP  - 185
EP  - 192
PB  - Universidade do Minho, Departamento de Engenharia Civil
CY  - Guimarães
ER  - 
TY  - JOUR
A1  - Förster, Arnold
A1  - Rosenauer, A.
A1  - Fischer, U.
A1  - Gerthsen, D.
T1  - Composition evaluation by lattice fringe analysis. Rosenauer, A.; Fischer U.;  Gerthsen D.;  Förster A.
JF  - Ultramicroscopy. 72 (1998), H. 3-4
Y1  - 1998
SN  - 0304-3991
SP  - 121
EP  - 133
ER  - 
TY  - JOUR
A1  - Förster, Arnold
A1  - Rosenauer, A.
A1  - Fischer, U.
A1  - Gerthsen, D.
T1  - Composition evaluation of InxGa1 – xAs Stranski-Krastanow-island structures by strain state analysis / A. Rosenauer ; U. Fischer ; D. Gerthsen ; A. Förster
JF  - Applied physics letters. 71 (1997), H. 26
Y1  - 1997
SN  - 0003-6951
N1  - ISSN der E-Ausg.: 1077-3118
SP  - 3868
EP  - 3870
ER  -