TY  - CHAP
A1  - Loeb, Horst W.
A1  - Schartner, Karl-Heinz
A1  - Dachwald, Bernd
A1  - Ohndorf, Andreas
A1  - Seboldt, Wolfgang
T1  - An Interstellar – Heliopause mission using a combination of solar/radioisotope electric propulsion
T2  - Presented at the 32nd International Electric Propulsion Conference
N2  - There is common agreement within the scientific community that in order to understand our local galactic environment it will be necessary to send a spacecraft into the region beyond the solar wind termination shock. Considering distances of 200 AU for a new mission, one needs a spacecraft travelling at a speed of close to 10 AU/yr in order to keep the mission duration in the range of less than 25 yrs, a transfer time postulated by ESA.Two propulsion options for the mission have been proposed and discussed so far: the solar sail propulsion and the ballistic/radioisotope electric propulsion. As a further alternative, we here investigate a combination of solar-electric propulsion and radioisotope-electric propulsion. The solar-electric propulsion stage consists of six 22 cm diameter “RIT-22”ion thrusters working with a high specific impulse of 7377 s corresponding to a positive grid voltage of 5 kV. Solar power of 53 kW BOM is provided by a light-weight solar array. The REP-stage consists of four space-proven 10 cm diameter “RIT-10” ion thrusters that will be operating one after the other for 9 yrs in total. Four advanced radioisotope generators provide 648 W at BOM. The scientific instrument package is oriented at earlier studies. For its mass and electric power requirement 35 kg and 35 W are assessed, respectively. Optimized trajectory calculations, treated in a separate contribution, are based on our “InTrance” method.The program yields a burn out of the REP stage in a distance of 79.6 AU for a usage of 154 kg of Xe propellant. With a C3 = 45,1 (km/s)2 a heliocentric probe velocity of 10 AU/yr is reached at this distance, provided a close Jupiter gravity assist adds a velocity increment of 2.7 AU/yr. A transfer time of 23.8 yrs results for this scenario requiring about 450 kg Xe for the SEP stage, jettisoned at 3 AU. We interpret the SEP/REP propulsion as a competing alternative to solar sail and ballistic/REP propulsion. Omiting a Jupiter fly-by even allows more launch flexibility, leaving the mission duration in the range of the ESA specification.
Y1  - 2011
N1  - 32nd International Electric Propulsion Conference, 11-15 September. Wiesbaden, Germany
SP  - 1
EP  - 7
ER  - 
TY  - CHAP
A1  - Ohndorf, Andreas
A1  - Dachwald, Bernd
A1  - Seboldt, Wolfgang
A1  - Schartner, Karl-Heinz
T1  - Flight times to the heliopause using a combination of solar and radioisotope electric propulsion
T2  - 32nd International Electric Propulsion Conference
N2  - We investigate the interplanetary flight of a low-thrust space probe to the heliopause,located at a distance of about 200 AU from the Sun. Our goal was to reach this distance within the 25 years postulated by ESA for such a mission (which is less ambitious than the 15-year goal set by NASA). Contrary to solar sail concepts and combinations of allistic and electrically propelled flight legs, we have investigated whether the set flight time limit could also be kept with a combination of solar-electric propulsion and a second, RTG-powered upper stage. The used ion engine type was the RIT-22 for the first stage and the RIT-10 for the second stage. Trajectory optimization was carried out with the low-thrust optimization program InTrance, which implements the method of Evolutionary Neurocontrol,using Artificial Neural Networks for spacecraft steering and Evolutionary Algorithms to optimize the Neural Networks’ parameter set. Based on a parameter space study, in which the number of thrust units, the unit’s specific impulse, and the relative size of the solar power generator were varied, we have chosen one configuration as reference. The transfer time of this reference configuration was 29.6 years and the fastest one, which is technically
more challenging, still required 28.3 years. As all flight times of this parameter study were longer than 25 years, we further shortened the transfer time by applying a launcher-provided hyperbolic excess energy up to 49 km2/s2. The resulting minimal flight time for the reference configuration was then 27.8 years. The following, more precise optimization to a launch with the European Ariane 5 ECA rocket reduced the transfer time to 27.5 years. This is the fastest mission design of our study that is flexible enough to allow a launch every
year. The inclusion of a fly-by at Jupiter finally resulted in a flight time of 23.8 years,which is below the set transfer-time limit. However, compared to the 27.5-year transfer,this mission design has a significantly reduced launch window and mission flexibility if the
escape direction is restricted to the heliosphere’s “nose".
KW  - low-thrust trajectory optimization
KW  - heliosphere
KW  - ion propulsion
Y1  - 2011
N1  - IEPC-2011-051
32nd International Electric Propulsion Conference,September 11–15, 2011
Wiesbaden, Germany
SP  - 1
EP  - 12
ER  - 
TY  - CHAP
A1  - Becker, Jörg
A1  - Eggert, Mathias
A1  - Winkelmann, Axel
A1  - Knackstedt, Ralf
T1  - Towards a Contingency Theory based Model of the Influence of Regulation on MIS
T2  - Proceedings of the Seventeenth Americas Conference on Information Systems, Detroit, Michigan August 4th -7 th 2011
Y1  - 2011
ER  - 
TY  - CHAP
A1  - Becker, Jörg
A1  - Bergener, Philipp
A1  - Delfmann, Patrick
A1  - Eggert, Mathias
A1  - Weiss, Burkhard
T1  - Supporting Business Process Compliance in Financial Institutions - A Model-Driven Approach
T2  - Proceedings of the 10th International Conference on Wirtschaftsinformatik : 16 - 18 February 2011, Zurich, Switzerland
Y1  - 2011
N1  - Wirtschaftsinformatik Proceedings 2011. 75.
SP  - 355
EP  - 364
ER  - 
TY  - CHAP
A1  - Becker, Jörg
A1  - Bergener, Philipp
A1  - Breuker, Dominic
A1  - Delfmann, Patrick
A1  - Eggert, Mathias
T1  - An Efficient Business Process Compliance Checking Approach
T2  - Governance and Sustainability in Information Systems. Managing the Transfer and Diffusion of IT : IFIP WG 8.6 International Working Conference, Hamburg, Germany, September 22-24, 2011. Proceedings
Y1  - 2011
U6  - https://doi.org/10.1007/978-3-642-24148-2_19
SP  - 282
EP  - 287
PB  - Springer
CY  - Berlin, Heidelberg
ER  - 
TY  - CHAP
A1  - Lao, B.
A1  - Bührig-Polaczek, A.
A1  - Röth, Thilo
ED  - Wielage, Bernhard
T1  - Funktionsintegrierte Leichtbaustrukturen in gussintensiver Metall-Hybridbauweise
T2  - Verbundwerkstoffe und Werkstoffverbunde: Tagungsband zum 18. Symposium ; 30.03.2011 bis 01.04.2011, Chemnitz
Y1  - 2011
SN  - 978-3-00-033801-4
N1  - Schriftenreihe Werkstoffe und werkstofftechnische Anwendungen ; 41
SP  - 413
EP  - 421
PB  - Eigenverlag
CY  - Chemnitz
ER  - 
TY  - CHAP
A1  - Butenweg, Christoph
A1  - Meskouris, Konstantin
A1  - Meister, Sylvia
A1  - Dreyer, Stephan
A1  - Schulte-Althoff, Christoph
T1  - Technisches Informationssystem für die Entwicklung textilbewehrten Betons
T2  - Textilbeton in Theorie und Praxis : Tagungsband zum 6. Kolloquium zu Textilbewehrten Tragwerken (CTRS6) in Berlin am 19. und 20.9.2011 / Technische Universität Dresden, Sonderforschungsbereich 528, herausgegeben von Manfred Curbach und Regine Ortlepp
Y1  - 2011
SN  - 978-3-86780-122-5
SP  - 257
EP  - 268
PB  - Technische Universität
CY  - Dresden
ER  - 
TY  - CHAP
A1  - Taddei, Francesca
A1  - Reindl, Lukas
A1  - Park, Jin
A1  - Butenweg, Christoph
A1  - Karadogan, Faruk
T1  - Numerical investigation of AAC wall panels based on the damage plasticity constitutive law
T2  - Cement, Wapno, Beton ; 2011, 7, Special issue: 5th International Conference on Autoclaved Aerated Concrete 'Securing a sustainable future' to be held at Bydgoszcz to celebrate 60 years of AAC experience in Poland, Bydgoszcz, September 14-17, 2011
Y1  - 2011
SN  - 1425-8129
SP  - 86
EP  - 91
PB  - Stowarzyszenie Producentów Cementu i Wapna
CY  - Krakow
ER  - 
TY  - CHAP
A1  - Butenweg, Christoph
A1  - Park, Jin
T1  - Verhalten von Ankerschienensystemen unter statisch zyklischen Beanspruchungen
T2  - 12. D-A-CH Tagung 2011 : Erdbeben und Baudynamik ; 15./16. September 2011, Hannover, Deutschland / Bundesanstalt für Geowissenschaften und Rohstoffe. C. Könke (Hrsg.)
Y1  - 2011
SN  - 3-930108-11-9
SP  - 349
EP  - 365
CY  - Deutsche Gesellschaft für Erdbebeningenieurwesen und Baudynamik
ER  - 
TY  - CHAP
A1  - Meskouris, Konstantin
A1  - Holtschoppen, Britta
A1  - Butenweg, Christoph
A1  - Rosin, Julia
T1  - Seismic analysis of liquid storage tanks
T2  - Earthquake Geology and Archaeology: Science, Society and Critical facilities : proceedings ; 2nd INQUA-IGCP 567 International Workshop on Active Tectonics, Earthquake Geology, Archaeology and Engineering ; 19-24 September 2011, Corinth (Greece) / Eds.: C. Grützner ; R. Pérez-Lopez ; T. Fernández Steeger ; I. Papanikolaou ; K. Reicherter ; P. G. Silva ; A. Vött. Volume 2
Y1  - 2011
SN  - 978-960-466-093-3
SP  - 136
EP  - 139
PB  - The Natural hazards Laboratory, National and Kapodistrian University of Athens
CY  - Athens
ER  - 
TY  - CHAP
A1  - Reindl, Lukas
A1  - Butenweg, Christoph
A1  - Kubalski, Thomas
T1  - Numerical simulation of unreinforced masonry walls subject to dynamic out-of-plane loading
T2  - COMPDYN 2011 : ECCOMAS Thematic Conference ; Proceedings of the 3rd International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering ; 25-28 May, 2011, Corfu, Greece / Eds.: M. Papadrakakis ...
Y1  - 2011
SN  - 978-960-99994-0-3
SP  - 1
EP  - 10
PB  - National Technical Univ. of Athens
CY  - Athen
ER  - 
TY  - CHAP
A1  - Park, Jin
A1  - El-Daib, Khaled
A1  - Butenweg, Christoph
A1  - Gellert, Christoph
T1  - A novel macroelement approach for masonry walls
T2  - Proceedings of the 8th International Conference on Structural Dynamics, EURODYN 2011 : Leuven, Belgium, 4 - 6 July 2011 / Katholieke Universiteit Leuven, ... G. De Roeck ... (eds)
Y1  - 2011
SN  - 978-90-76019-31-4
SP  - 3281
EP  - 3286
PB  - K. U. Leuven, Dep. of Civil Engineering
CY  - Leuven
ER  - 
TY  - CHAP
A1  - Holtschoppen, Britta
A1  - Cornelissen, Philipp
A1  - Butenweg, Christoph
A1  - Meskouris, Konstantin
T1  - Vereinfachtes Berechnungsverfahren zur Berücksichtigung der Interaktionsschwingung bei flüssigkeitsgefüllten Tankbauwerken unter seismischer Belastung
T2  - Berichte der Fachtagung Baustatik-Baupraxis 11 : am 21. und 22. Februar 2011 an der Universität Innsbruck / Hrsg. Gernot Beer ...
Y1  - 2011
SN  - 978-3-85125-115-9
SP  - 155
EP  - 162
PB  - Inst. für Baustatik, Techn. Univ. Graz
CY  - Graz
ER  - 
TY  - CHAP
A1  - Kirsch, Ansgar
A1  - Mattle, Bruno
T1  - Einflussfaktoren auf die Erddruckverteilung bei eingeschütteten Tunneln
T2  - Baustatik Baupraxis : BB / Fachtagung Baustatik Baupraxis. Lehrstühle und Institute für Statik, TH Aachen, TU Berlin, U Bochum [u.a.]
Y1  - 2011
SP  - 1
EP  - 8
ER  - 
TY  - CHAP
A1  - Stieglitz, Kristian
A1  - Wollert, Jörg
T1  - Approach of using ultra-wideband-radio in industrial real-time ethernet networks
T2  - The 4th International Multi-Conference on Engineering and Technological Innovation : IMETI : July 19th - July 22nd, 2011, Orlando, Florida, USA
Y1  - 2011
SP  - 1
EP  - 6
ER  - 
TY  - CHAP
A1  - Buda, Aurel
A1  - Wollert, Jörg
T1  - Leistungsbewertung von Ultra Wideband Funktechnologien nach ECMA 368 für den Einsatz in industriellen Kommunikationssystemen
T2  - Kommunikation in der Automation : Magdeburg, 27. - 28.09.2011 ; 2. Jahreskolloquium Kommunikation in der Automation ; KOMMA 2011 / Ulrich Jumar ... (Hrsg.)
Y1  - 2011
SN  - 978-3-940961-58-7
PB  - ifak, Institut für Automation und Kommunikation e.V. Magdeburg an der Otto-von-Guericke-Universität Magdeburg
CY  - Magdeburg
ER  - 
TY  - CHAP
A1  - Kirchhof, Michael
A1  - Kraft, Bodo
T1  - Dogmatisches „Entweder agil oder klassisch" im Projektmanagement hat ausgedient - die richtige Mischung macht's
T2  - Projekt-Sternstunden : strahlende Erfolge durch Kompetenz
Y1  - 2011
SN  - 978-3-924841-60-7
N1  - PM-Forum <28, 2011, Nürnberg> ; 
PM-Forum 2011, 28. Internationales Deutsches Projektmanagement-Forum ; Nürnberg, 25. - 26.10.2011 ; Tagungsband
SP  - 414
EP  - 425
PB  - GPM
CY  - Nürnberg
ER  - 
TY  - CHAP
A1  - Höttges, Jörg
ED  - Pinnekamp, Johannes
T1  - GIS-gestützte Niederschlagswasserbeseitigungskonzepte - Aufgaben und Inhalte
T2  - 44. Essener Tagung für Wasser- und Abfallwirtschaft : "zukunftsfähige Wasserwirtschaft - kosteneffizient und energiebewusst"; 23. bis 25. März 2011 im Eurogress Aachen
Y1  - 2011
SN  - 978-3-938996-29-4
N1  - Gewässerschutz, Wasser, Abwasser ; 223
SP  - 29/1
EP  - 29/14
PB  - Ges. zur Förderung der Siedlungswasserwirtschaft an der RWTH Aachen
CY  - Aachen
ER  - 
TY  - CHAP
A1  - Höttges, Jörg
A1  - Rolfing, Richard
A1  - Sieker, Heiko
A1  - Siekmann, Marko
A1  - Wermter, Paul
ED  - Pinnekamp, Johannes
T1  - GIS-gestützte Erstellung von Niederschlagswasserbeseitigungskonzepten
T2  - 12. Kölner Kanal- und Kläranlagen-Kolloquium : 13. und 14. Oktober 2011 im Maternushaus, Köln / ISA, Institut und Lehrstuhl für Siedlungswasserwirtschaft
Y1  - 2011
SN  - 978-3-938996-08-9
N1  - Aachener Schriften zur Stadtentwässerung ; 15
SP  - 8/1
EP  - 8/13
PB  - Ges. zur Förderung der Siedlungswasserwirtschaft an der RWTH Aachen
CY  - Aachen
ER  - 
TY  - CHAP
A1  - Fuchs, Britta
A1  - Ritz, Thomas
A1  - Halbach, Bastian
A1  - Hartl, Florian
ED  - Marca, David A.
T1  - Blended shopping : interactivity and individualization
T2  - Proceedings of the International Conference on e-Business : Seville, Spain, 18 - 21 July 2011 ; [... integrated in the ICETE (International Conference on e-Business and Telecommunications) joint conference]
Y1  - 2011
SN  - 978-989-8425-70-6
SP  - 47
EP  - 52
PB  - SciTePress
CY  - [Lissabon]
ER  -