TY  - JOUR
A1  - Kern, Alexander
T1  - Neue deutsche Blitzschutz-Normung. Reihe DIN EN 62305 / VDE 01 85-305-x:2006
JF  - Der Eisenbahningenieur. 58 (2007), H. 8
Y1  - 2007
SN  - 0013-2810
N1  - in der Bereichsbibliothek Bayernallee vorhanden
SP  - 18
EP  - 22
ER  - 
TY  - JOUR
A1  - Blanke, Tobias
A1  - Hagenkamp, Markus
A1  - Döring, Bernd
A1  - Göttsche, Joachim
A1  - Reger, Vitali
A1  - Kuhnhenne, Markus
T1  - Net-exergetic, hydraulic and thermal optimization of coaxial heat exchangers using fixed flow conditions instead of fixed flow rates
JF  - Geothermal Energy
N2  - Previous studies optimized the dimensions of coaxial heat exchangers using constant mass fow rates as a boundary condition. They show a thermal optimal circular ring width of nearly zero. Hydraulically optimal is an inner to outer pipe radius ratio of 0.65 for turbulent and 0.68 for laminar fow types. In contrast, in this study, fow conditions in the circular ring are kept constant (a set of fxed Reynolds numbers) during optimization. This approach ensures fxed fow conditions and prevents inappropriately high or low mass fow rates. The optimization is carried out for three objectives: Maximum energy gain, minimum hydraulic efort and eventually optimum net-exergy balance. The optimization changes the inner pipe radius and mass fow rate but not the Reynolds number of the circular ring. The thermal calculations base on Hellström’s borehole resistance and the hydraulic optimization on individually calculated linear loss of head coefcients. Increasing the inner pipe radius results in decreased hydraulic losses in the inner pipe but increased losses in the circular ring. The net-exergy diference is a key performance indicator and combines thermal and hydraulic calculations. It is the difference between thermal exergy fux and hydraulic efort. The Reynolds number in the circular ring is instead of the mass fow rate constant during all optimizations. The result from a thermal perspective is an optimal width of the circular ring of nearly zero. The hydraulically optimal inner pipe radius is 54% of the outer pipe radius for laminar fow and 60% for turbulent fow scenarios. Net-exergetic optimization shows a predominant infuence of hydraulic losses, especially for small temperature gains. The exact result depends on the earth’s thermal properties and the fow type. Conclusively, coaxial geothermal probes’ design should focus on the hydraulic optimum and take the thermal optimum as a secondary criterion due to the dominating hydraulics.
Y1  - 2021
U6  - http://dx.doi.org/10.1186/s40517-021-00201-3
SN  - 2195-9706
N1  - Corresponding author: Tobias Blanke
VL  - 9
IS  - Article number: 19
PB  - Springer
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Dielmann, Klaus-Peter
A1  - Mehlkopf, Marcus
T1  - National zugeteilte Emissionen
JF  - BWK : das Energie-Fachmagazin
Y1  - 2005
SN  - 0006-9612
SN  - 1618-193X
VL  - 57
IS  - 5
SP  - 48
EP  - 52
ER  - 
TY  - JOUR
A1  - Norda, Hannah
A1  - Butenweg, Christoph
T1  - Möglichkeiten und Grenzen der Anwendbarkeit statisch nichtlinearer Verfahren nach DIN EN 1998-1
JF  - Bauingenieur : die richtungsweisende Zeitschrift im Bauingenieurswesen ; offizielle Zeitschrift der VDI-Gesellschaft Bautechnik. Beilage: D-A-CH-Mitteilungsblatt
Y1  - 2011
SN  - 1436-4867 (E-Journal); 0005-6650 (Print)
N1  - Printausgabe in der Bibliothek Bayernallee vorhanden: 13 Z 049-2011
VL  - Band 86
SP  - S13
EP  - S21
PB  - VDI Fachmedien
CY  - Düsseldorf
ER  - 
TY  - JOUR
A1  - Jungbluth, Christian
A1  - Borchert, Jörg
T1  - Möglichkeiten der Strompreisbeeinflussung im oligopolistischen Markt
JF  - ZNER Zeitschrift für Neues Energierecht
Y1  - 2008
IS  - 4
SP  - 314
EP  - 323
ER  - 
TY  - JOUR
A1  - Pieper, Martin
T1  - Multiobjective optimization with expensive objectives applied to a thermodynamic material design problem
JF  - Proceedings in applied mathematics and mechanics : PAMM. 11 (2011), H. 1
Y1  - 2011
SN  - 1617-7061
SP  - 733
EP  - 734
PB  - Wiley
CY  - Weinheim
ER  - 
TY  - JOUR
A1  - Göttsche, Joachim
A1  - Alexopoulos, Spiros
A1  - Dümmler, Andreas
A1  - Maddineni, S. K.
T1  - Multi-Mirror Array Calculations With Optical Error
N2  - The optical performance of a 2-axis solar concentrator was simulated with the COMSOL Multiphysics® software. The concentrator consists of a mirror array, which was created using the application builder. The mirror facets are preconfigured to form a focal point. During tracking all mirrors are moved simultaneously in a coupled mode by 2 motors in two axes, in order to keep the system in focus with the moving sun. Optical errors on each reflecting surface were implemented in combination with the solar angular cone of ± 4.65 mrad. As a result, the intercept factor of solar radiation that is available to the receiver was calculated as a function of the transversal and longitudinal angles of incidence. In addition, the intensity distribution on the receiver plane was calculated as a function of the incidence angles.
KW  - solar process heat
KW  - concentrating collector
KW  - raytracing
KW  - point-focussing system
Y1  - 2019
SP  - 1
EP  - 6
ER  - 
TY  - JOUR
A1  - Förster, Arnold
A1  - Tillmann, K.
A1  - Gerthsen, D.
T1  - Morphological transformations of MBE-grown In0.6Ga0.4As island on GaAs(001) substrates / K. Tillmann ; D. Gerthsen ; P. Pfundstein ; A. Förster ...
JF  - Microscopy of semiconducting materials 1995 : proceedings of the Institute of Physics Conference held at Oxford University, 20 - 23 March 1995 / Ed. by A G Cullis ... - (Conference series / Institute of Physics ; 146)
Y1  - 1995
SN  - 0-7503-0347-6
N1  - MSM <9, 1995, Oxford> ; Institut of Physics <London>
SP  - 195
EP  - ff.
PB  - Institute of Physics
CY  - Bristol [u.a.]
ER  - 
TY  - JOUR
A1  - Rossi, Leonardo
A1  - Winands, Mark H. M.
A1  - Butenweg, Christoph
ED  - Zhang, Jessica
T1  - Monte Carlo Tree Search as an intelligent search tool in structural design problems
JF  - Engineering with Computers : An International Journal for Simulation-Based Engineering
N2  - Monte Carlo Tree Search (MCTS) is a search technique that in the last decade emerged as a major breakthrough for Artificial Intelligence applications regarding board- and video-games. In 2016, AlphaGo, an MCTS-based software agent, outperformed the human world champion of the board game Go. This game was for long considered almost infeasible for machines, due to its immense search space and the need for a long-term strategy. Since this historical success, MCTS is considered as an effective new approach for many other scientific and technical problems. Interestingly, civil structural engineering, as a discipline, offers many tasks whose solution may benefit from intelligent search and in particular from adopting MCTS as a search tool. In this work, we show how MCTS can be adapted to search for suitable solutions of a structural engineering design problem. The problem consists of choosing the load-bearing elements in a reference reinforced concrete structure, so to achieve a set of specific dynamic characteristics. In the paper, we report the results obtained by applying both a plain and a hybrid version of single-agent MCTS. The hybrid approach consists of an integration of both MCTS and classic Genetic Algorithm (GA), the latter also serving as a term of comparison for the results. The study’s outcomes may open new perspectives for the adoption of MCTS as a design tool for civil engineers.
KW  - Monte Carlo Tree Search
KW  - Structural design
KW  - Artificial intelligence
KW  - Civil engineering
KW  - Genetic algorithm
Y1  - 2022
U6  - http://dx.doi.org/10.1007/s00366-021-01338-2
SN  - 1435-5663
SN  - 0177-0667
VL  - 38
IS  - 4
SP  - 3219
EP  - 3236
PB  - Springer Nature
CY  - Cham
ER  - 
TY  - JOUR
A1  - Förster, Arnold
A1  - Zettler, J.-T.
A1  - Mikkelsen, H.
A1  - Leo, K.
T1  - Modulated ellipsometric measurements and transfer-matrix calculation of the field-dependent dielectric function of a multiple quantum well / J.-Th. Zettler ; H. Mikkelsen ; K. Leo ... A. Förster
JF  - Physical Review B . 46 (1992), H. 24
Y1  - 1992
SN  - 0163-1829
N1  - 2. ISSN: 1098-0121 ; ISSN der E-Ausg.: 1095-3795
SP  - 15955
EP  - 15962
ER  - 
TY  - JOUR
A1  - Mistler, Michael
A1  - Butenweg, Christoph
A1  - Meskouris, Konstantin
T1  - Modelling methods of historic masonry buildings under seismic excitation
JF  - Journal of seismology
Y1  - 2006
U6  - http://dx.doi.org/10.1007/s10950-006-9033-z
SN  - 1383-4649 (Print) ; 1573-157X (E-Journal)
VL  - Volume 10
IS  - No. 4
SP  - 497
EP  - 510
ER  - 
TY  - JOUR
A1  - Kubalski, Thomas
A1  - Butenweg, Christoph
T1  - Modelling strategies for horizontally loaded infill masonry
T1  - Modellierungsansätze für horizontal beanspruchtes Ausfachungsmauerwerk
JF  - Mauerwerk : European journal of masonry
Y1  - 2015
U6  - http://dx.doi.org/10.1002/dama.201500675
VL  - Volume 19
IS  - Issue 5
SP  - 363
EP  - 369
PB  - Wiley
CY  - Weinheim
ER  - 
TY  - JOUR
A1  - Vogt, Christian
A1  - Iwanowski-Strahser, Katha
A1  - Marquart, Gabriele
A1  - Arnold, Juliane
A1  - Mottaghy, Darius
A1  - Pechnig, Renate
A1  - Gnjezda, Daniel
A1  - Clauser, Christoph
T1  - Modeling contribution to risk assessment of thermal production power for geothermal reservoirs
JF  - Renewable Energy
Y1  - 2013
U6  - http://dx.doi.org/10.1016/j.renene.2012.11.026
SN  - 0960-1481
VL  - 53
SP  - 230
EP  - 241
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Rieke, Christian
A1  - Stollenwerk, Dominik
A1  - Dahmen, Markus
A1  - Pieper, Martin
T1  - Modeling and optimization of a biogas plant for a demand-driven energy supply
JF  - Energy
N2  - Due to the Renewable Energy Act, in Germany it is planned to increase the amount of renewable energy carriers up to 60%. One of the main problems is the fluctuating supply of wind and solar energy. Here biogas plants provide a solution, because a demand-driven supply is possible. Before running such a plant, it is necessary to simulate and optimize the process. This paper provides a new model of a biogas plant, which is as accurate as the standard ADM1 model. The advantage compared to ADM1 is that it is based on only four parameters compared to 28. Applying this model, an optimization was installed, which allows a demand-driven supply by biogas plants. Finally the results are confirmed by several experiments and measurements with a real test plant.
Y1  - 2018
U6  - http://dx.doi.org/10.1016/j.energy.2017.12.073
SN  - 0360-5442
VL  - 145
SP  - 657
EP  - 664
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Förster, Arnold
A1  - Zamdmer, N.
A1  - Hu, Qing
A1  - Verghese, S.
T1  - Mode-Discriminating Photoconductor and Coplanar Wave-Guide Circuits for Picosecond Sampling. Zamdmer, N.; Hu, Qing ; Verghese, S. ; Förster, A.
JF  - Applied Physics Letters. 74 (1999), H. 7
Y1  - 1999
SN  - 1077-3118
SP  - 1039
EP  - 1041
ER  - 
TY  - JOUR
A1  - Thielemann, Frank
A1  - Kriegesmann, Bernd
A1  - Schaffner, M.
T1  - Mit vereinten Kräften die Wettbewerbsfähigkeit steigern - Kooperation als Antwort auf den In­novationsdruck . Kriegesmann, B.; Thielemann, F.; Schaffner, M.
JF  - Der Druckspiegel. 50 (1995), H. 10
Y1  - 1995
SN  - 0012-6500
SP  - 931
EP  - 935
ER  - 
TY  - JOUR
A1  - Thielemann, Frank
T1  - Mit vereinten Kräften
JF  - Trockenbau, Akustik : Magazin für Planung und Ausführung. 15 (1998), H. 5
Y1  - 1998
SN  - 0179-8006
SP  - 60
EP  - 68
ER  - 
TY  - JOUR
A1  - Thielemann, Frank
T1  - Mit strategischen Allianzen ins nächste Jahrtausend
JF  - Druckspiegel. 53 (1998), H. 5
Y1  - 1998
SN  - 0012-6500
SP  - 21
EP  - 24
ER  - 
TY  - JOUR
A1  - Dielmann, Klaus-Peter
A1  - Ihle, R.
T1  - Mikroturbinen : neue Chancen der Kraft-Wärme-(Kälte-)Kopplung im Leistungsbereich 30 - 200 kW(ind el) / R. Ihle ; K. Dielmann
JF  - Integrierte Energiesysteme : Chancen im Wettbewerb ; Tagung Nürnberg, 4. und 5. April 2000 / VDI-Gesellschaft Energietechnik. - (VDI-Berichte ; 1539)
Y1  - 2000
SN  - 3-18-091539-0
SP  - 245
EP  - 266
PB  - VDI-Verl.
CY  - Düsseldorf
ER  - 
TY  - JOUR
A1  - Dielmann, Klaus-Peter
T1  - Mikrogasturbinen : Technik und Anwendung
JF  - BWK : das Energie-Fachmagazin . 53 (2001), H. 6
Y1  - 2001
SN  - 0006-9612
N1  - 2. ISSN: 1618-193X
SP  - 6
EP  - 9
ER  -