TY - JOUR A1 - Frings, Michael T1 - Das Wohnungsrecht : Ausübungshindernis, Sozialhilferegress und Fremdvermietung bei Übergabeverträgen JF - Neue Wirtschaftsbriefe Online; NWB ; Zeitschrift für Steuer- und Wirtschaftsrecht ; Sammelwerk ; Aufsätze, Kommentare, Gesetzestexte, Urteile (2009) Y1 - 2009 SN - 0028-3460 N1 - zugleich: NWB Fach 19 S. 4109 - ; NWB DokID: XAAAD-24202 ; Zugriff über die Digitale Bibliothek SP - 2253 EP - 2262 PB - NWB Verlag CY - Herne ER - TY - JOUR A1 - Frings, Michael T1 - Die Neuregelung der Haftung für Vereins- und Stiftungsvorstände : Überwachungspflicht, Haftungsprivilegierung, Haftungsfreistellung bei einfacher Fahrlässigkeit JF - Neue Wirtschaftsbriefe Online; NWB ; Zeitschrift für Steuer- und Wirtschaftsrecht ; Sammelwerk ; Aufsätze, Kommentare, Gesetzestexte, Urteile (2009) Y1 - 2009 SN - 0028-3460 N1 - zugleich: NWB Fach 18 - ; NWB DokID: LAAAD-31399 ; Zugriff über die Digitale Bibliothek SP - 3662 EP - 3667 PB - NWB Verlag CY - Herne ER - TY - JOUR A1 - Frings, Michael T1 - Überleitungsfähigkeit des Wohnungsrechts auf Sozialhilfeträger? JF - Sozialrecht aktuell. 13 (2009) Y1 - 2009 SN - 1434-7261 SP - 2001 EP - 2004 ER - TY - JOUR A1 - Fredebeul-Krein, Markus A1 - Steingröver, Markus T1 - Next Generation Access Networks: Why is there a higher risk of investment and how to deal with it? JF - Wettbewerbsprobleme im Internet / Jörn Kruse ... (Hrsg.). Mit Beitr. von: Patrick F. E. Beschorner ... Y1 - 2009 SN - 978-3-8329-5024-8 N1 - Hamburger Forum Medienökonomie ; 9 SP - 83 EP - 102 PB - Nomos, Ed. Fischer CY - Baden-Baden ER - TY - CHAP A1 - Fredebeul-Krein, Markus T1 - Encouraging competition and investment into next generation access networks: The case of long term risk sharing contracts N2 - Working paper distributed at 2nd Annual Next Generation Telecommunications Conference 2009, 13th – 14th October 2009, Brussels 14 pages Abstract Governments all over Europe are in the process of adopting new broadband strategies. The objective is to create modern telecommunications networks based on powerful broadband infrastructures". In doing so, they aim for innovative and investment-friendly concepts. For instance, in a recently published consultation paper on the subject the German regulator BNetzA declared that it will take “greater account of … reducing risks, securing the investment and innovation power, providing planning certainty and transparency – in order to support and advance broadband rollout in Germany”. It further states that when regulating wholesale rates it has to be ensured that “… adequate incentives for network rollout are provided on the one hand, while sustainable and fair competition is ensured on the other”. Also an EC draft recommendation on regulated network access is about to set new standards for the regulation of next generation access networks. According to the recommendation the prices of new assets shall be based on costs plus a projectspecific risk premium to be included in the costs of capital for the investment risk incurred by the operator. This approach has been criticised from various sides. In particular it has been questioned whether such an approach is adequate to meet the objectives of encouraging both competition and investment into next generation access networks. Against this background, the concept of “long term risk sharing contracts” has been proposed recently as an approach which does not only incorporate the various additional risks involved in the deployment of NGA infrastructure, but has several other advantages. This paper will demonstrate that the concept allows for competition to evolve at both the retail and wholesale level on fair, objective, non-discriminatory and transparent terms and conditions. Moreover, it ensures the highest possible investment incentive in line with socially desirable outcome. The paper is organised as follows: The next section will briefly outline the importance of encouraging competition and investment in an NGA-environment. The third section will specify the design of long term risk sharing contracts in view of achieving these objectives. The fourth section will examine potential problems associated with the concept. In doing so a way of how to deal with them will be elaborated. The last section will look at arguments against long term risk sharing contracts. It will be shown that these arguments are not strong enough to build a case against introducing such contracts. KW - Electronic Commerce KW - Breitband Markt KW - Regulierung KW - Internet KW - Bundesnetzagentur KW - broadband market KW - regulation KW - Internet KW - next generation access networks KW - risk sharing Y1 - 2009 ER - TY - JOUR A1 - Frauenrath, Tobias A1 - Hezel, Fabian A1 - Heinrichs, Uwe A1 - Kozerke, Sebastian A1 - Utting, Jane A1 - Kob, Malte A1 - Butenweg, Christoph A1 - Boesiger, Peter A1 - Niendorf, Thoralf T1 - Feasibility of Cardiac Gating Free of Interference With Electro-Magnetic Fields at 1.5 Tesla, 3.0 Tesla and 7.0 Tesla Using an MR-Stethoscope JF - Investigative Radiology KW - phonocardiogram KW - electrocardiogram KW - cardiac gating KW - high field MR imaging KW - cardiovascular MR imaging Y1 - 2009 U6 - https://doi.org/10.1097/RLI.0b013e3181b4c15e SN - 1536-0210 (online) SN - 0020-9996 (gedruckt) VL - 44 IS - 9 SP - 539 EP - 547 PB - Lippincott Williams & Wilkins ; (via Ovid) CY - Philadelphia, Pa ER - TY - JOUR A1 - Frank, T. A1 - Buchwald, D. A1 - Pennekamp, W. A1 - Reber, D. A1 - Sponagel, Stefan A1 - Laszkovics, A. A1 - Weber, Hans-Joachim T1 - Röntgenologische Untersuchung der Strömungseigenschaften funktioneller Komponenten der Herz-Lungen-Maschine JF - Kardiotechnik. 18 (2009), H. 2 Y1 - 2009 SN - 0941-2670 N1 - gedruckt in der Bibliothek unter der Signatur 63 Z 629 SP - 31 EP - 35 ER - TY - JOUR A1 - Fonti, Patrick A1 - Eilmann, Britta A1 - García-González, Ignacio A1 - von Arx, Georg T1 - Expeditious building of ring-porous earlywood vessel chronologies without loosing signal information JF - Trees : structure and function Y1 - 2009 U6 - https://doi.org/10.1007/s00468-008-0310-z SN - 0931-1890 (Print) SN - 1432-2285 (Online) VL - 23 IS - 3 SP - 665 EP - 671 PB - Springer CY - Berlin ER - TY - JOUR A1 - Focke, Markus T1 - Flussorientierung in der Beschaffungslogistik: ein Ansatz zur Optimierung auf Basis des Toyota Produktionssystems JF - Märkte, Anwendungsfelder und Technologien in der Logistik : Ergebnisse und Reflexion von 20 Jahren Logistikforschung ; Festschrift für Peter Klaus / Stefanie Müller ... (Hrsg.) Y1 - 2009 SN - 978-3-8349-1821-5 SP - 25 EP - 44 PB - Gabler CY - Wiesbaden ER - TY - JOUR A1 - Fleischhaker, Robert A1 - Evers, Jörg T1 - Phase-controlled pulse propagation in media with cross coupling of electric and magnetic probe field component JF - Physical Review A - Atomic, molecular, and optical physics Y1 - 2009 U6 - https://doi.org/10.1103/PHYSREVA.80.063816 SN - 1050-2947 VL - 80 IS - 6 SP - 063816 ER - TY - THES A1 - Fleischhaker, Robert T1 - Light propagation in dense and chiral media Y1 - 2009 N1 - Heidelberg, Univ., Diss., 2009 ER - TY - CHAP A1 - Fissabre, Anke A1 - Niethammer, Bernd T1 - The Invention of Glazed Curtain Wall in 1903 – The Steiff Toy Factory T2 - Proceedings of the Third International Congress of Construction History, TU Cottbus 20.-24. Mai 2009, Vol 2 Y1 - 2009 SN - 978-3-936033-31-1 SP - 595 EP - 602 PB - Neunplus1 CY - Berlin ER - TY - THES A1 - Fissabre, Anke T1 - Dachterrassen der Renaissance Y1 - 2009 N1 - Aachen, Techn. Hochsch., Diss., 2009 Bd. [1] Textband ; Bd. [2] Abbildungsband ER - TY - JOUR A1 - Fischer, Jan-Thomas A1 - Kowalski, Julia A1 - Pudasaini, Shiva P. A1 - Miller, S. A. T1 - Dynamic Avalanche Modeling in Natural Terrain JF - International Snow Science Workshop, Davos 2009, Proceedings ; Proc. ISSW 2009 N2 - The powerful avalanche simulation toolbox RAMMS (Rapid Mass Movements) is based on a depth-averaged hydrodynamic system of equations with a Voellmy-Salm friction relation. The two empirical friction parameters μ and � correspond to a dry Coulomb friction and a viscous resistance, respectively. Although μ and � lack a proper physical explanation, 60 years of acquired avalanche data in the Swiss Alps made a systematic calibration possible. RAMMS can therefore successfully model avalanche flow depth, velocities, impact pressure and run out distances. Pudasaini and Hutter (2003) have proposed extended, rigorously derived model equations that account for local curvature and twist. A coordinate transformation into a reference system, applied to the actual mountain topography of the natural avalanche path, is performed. The local curvature and the twist of the avalanche path induce an additional term in the overburden pressure. This leads to a modification of the Coulomb friction, the free-surface pressure gradient, the pressure induced by the channel, and the gravity components along and normal to the curved and twisted reference surface. This eventually guides the flow dynamics and deposits of avalanches. In the present study, we investigate the influence of curvature on avalanche flow in real mountain terrain. Simulations of real avalanche paths are performed and compared for the different models approaches. An algorithm to calculate curvature in real terrain is introduced in RAMMS. This leads to a curvature dependent friction relation in an extended version of the Voellmy-Salm model equations. Our analysis provides yet another step in interpreting the physical meaning and significance of the friction parameters used in the RAMMS computational environment. KW - snow KW - avalanche Y1 - 2009 SP - 448 EP - 452 ER - TY - JOUR A1 - Ferrein, Alexander A1 - Steinbauer, Gerald A1 - McPhillips, Graeme A1 - Niemüller, Tim A1 - Potgieter, Anet T1 - Team Zadeat 2009 : team report Y1 - 2009 VL - 6 SP - 1 ER - TY - JOUR A1 - Ferrein, Alexander A1 - Schiffer, Stefan A1 - Lakemeyer, Gerhard T1 - Embedding fuzzy controllers in golog / Ferrein, Alexander ; Schiffer, Stefan ; Lakemeyer, Gerhard JF - IEEE International Conference on Fuzzy Systems, 2009. FUZZ-IEEE 2009 Y1 - 2009 SN - 978-1-4244-3596-8 SP - 894 EP - 899 PB - IEEE CY - New York ER - TY - JOUR A1 - Ferrein, Alexander A1 - Rens, Gavin A1 - Poel, Etienne van der T1 - A BDI agent architecture for a POMDP planner / Rens, Gavin ; Ferrein, Alexander ; Poel, Etienne van der Y1 - 2009 N1 - 9th International Symposium on Logical Formalization of Commonsense Reasoning: Commonsense 2009, Toronto, Canada, 1-3 June, 2009 SP - 1 EP - 6 ER - TY - CHAP A1 - Ferrein, Alexander A1 - Potgieter, Anet A1 - Steinbauer, Gerald T1 - Self-aware robots - What do we need from learning, deliberation, and reactive control? T2 - HYCAS 2009 : International Workshop on Hybrid Control of Autonomous Systems : Integrating Learning, Deliberation and Reactive Control : Pasadena, Calif., 13 July 2009 Y1 - 2009 SP - 1 EP - 5 PB - AAAI Pr. ER - TY - BOOK A1 - Ferrein, Alexander A1 - Pauli, J. A1 - Siebel, N. T. A1 - Steinbauer, Gerald T1 - Hybrid control for autonomous systems : [... 1st Workshop on Hybrid Control of Autonomous Systems - Integrating Learning, Deliberation and Reactive Control with the 21st International Joint Conference on Artificial Intelligence (IJCAI-09), held in Pasadena, CA, in July 2009] / ed. by Alexander Ferrein ... Y1 - 2009 ER - TY - JOUR A1 - Ferrein, Alexander A1 - Jacobs, Stefan A1 - Schiffer, Stefan A1 - Beck, Daniel T1 - Robust Collision Avoidance in Unknown Domestic Environments / Jacobs, Stefan ; Ferrein, Alexander ; Schiffer, Stefan ; Beck, Daniel ; Lakemeyer, Gerhard JF - ROBOCUP 2009: ROBOT SOCCER WORLD CUP XIII Y1 - 2009 N1 - Lecture Notes in Computer Science ; 5949 SP - 116 EP - 127 PB - Springer CY - Berlin ER - TY - JOUR A1 - Ferrein, Alexander A1 - Beck, Daniel A1 - Lakemeyer, Gerhard T1 - Landmark-Based Representations for Navigating Holonomic Soccer Robots / Beck, Daniel ; Ferrein, Alexander ; Lakemeyer, Gerhard JF - RoboCup 2008 : robot soccer world cup XII / Luca Iocchi ... (eds.) Y1 - 2009 SN - 978-3-642-02921-9 N1 - Lecture Notes in Computer Science ; 5399 SP - 25 EP - 36 PB - Springer CY - Heidelberg ER - TY - CHAP A1 - Fellin, Wolfgang A1 - King, Julian A1 - Kirsch, Ansgar A1 - Oberguggenberger, Michael T1 - Uncertainty modelling and sensitivity analysis of tunnel face stability T2 - Safety, reliability and risk of structures, infrastructures and engineering systems : proceedings of the tenth International Conference on Structural Safety and Reliability (ICOSSAR 2009), Osaka, Japan, 13-17 September 2009 / ed.: Hitoshi Furuta ... Y1 - 2009 SN - 978-0-415-47557-0 SP - 112 EP - 114 PB - CRC Pr. CY - Boca Raton, Fla. [u.a.] ER - TY - CHAP A1 - Feiser, Johannes T1 - Geotechnik T2 - Wendehorst Beispiele aus der Baupraxis. - 3. Aufl. Y1 - 2009 SN - 978-3-8348-0684-0 ; 978-3-8348-9997-2 U6 - https://doi.org/10.1007/978-3-8348-9997-2_13 SP - 351 EP - 392 PB - Springer Vieweg CY - Wiesbaden ER - TY - JOUR A1 - Fabo, Sabine T1 - Chicks off speed JF - hello! (Boxhorn ; 19) KW - Hühnerzucht KW - Unterhaltung Y1 - 2013 SN - 1864-2535 VL - 2009 SP - 19 EP - 21 PB - FH Aachen, Fachbereich Gestaltung CY - Aachen ER - TY - JOUR A1 - Ewe, Hendrik A1 - Klein, Peter A1 - Pieper, Martin A1 - Füldner, G. T1 - Heat conductivity in sintered aluminium fibers JF - Cellular metals for structural and functional applications : CELLMET 2008 ; proceedings of the International Symposium on Cellular Metals for Structural and Functional Applications held October 8 - 10, 2008 in Dresden, Germany / ed. by Günter Stephani Y1 - 2009 SP - 187 EP - 193 PB - Fraunhofer IFAM CY - Dresden ER - TY - BOOK A1 - Esch, Thomas T1 - Raumfahrtantriebe. 7. Aufl., [Umdruck] Y1 - 2009 PB - Fachhochschule Aachen, Lehr- und Forschungsgebiet Thermodynamik und Verbrennungstechnik CY - Aachen ER - TY - CHAP A1 - Epple, U. A1 - Brandes, Sinja A1 - Gligorevic, Snjezana A1 - Schnell, Michael T1 - Receiver optimization for L-DACS1 T2 - IEEE/AIAA 28th Digital Avionics Systems Conference : 23-29 Oct. 2009 : Orlando, Fla. Y1 - 2009 SN - 978-1-4244-4078-8 SP - 4B1-1 EP - 4B1-12 ER - TY - JOUR A1 - Enning, Manfred A1 - Dolls, S. A1 - Brunberg, A. T1 - Selbsteinstellverfahren für Temperiervorrichtungen mit Außenverrohrung / Dolls, S. ; Enning, M. ; Brunberg, A. ; Abel, D. JF - Automation 2009 : Automatisierungskongress in Deutschland ; Kongress Baden-Baden, 16. und 17. Juni 2009 / VDI-VDE-Gesellschaft Mess- und Automatisierungstechnik Y1 - 2009 SN - 978-3-18-092067-2 N1 - Automatisierungskongress <2009, Baden-Baden> ; VDI-Berichte ; 2067 SP - 429 EP - 432 PB - VDI-Verl. CY - Düsseldorf ER - TY - JOUR A1 - Enning, Manfred A1 - Baier, M. A1 - Daniel, A. F. T1 - Fahrzeugtechnische Machbarkeitsstudie eines selbstangetriebenen Güterwagens für das System FlexCargoRail / Baier, M. ; Daniel, A. F. ; Enning, M. JF - ZEVrail : Glasers Annalen ; Zeitschrift für das gesamte System Bahn. 133 (2009), H. 1-2 Y1 - 2009 SN - 1618-8330 SP - 52 EP - 58 PB - Siemens CY - Berlin ER - TY - JOUR A1 - Enning, Manfred A1 - Baier, M. T1 - Energetic and operational use of FlexCargoRail freight wagons in the single wagon load traffic / Baier, M. ; Enning, M. JF - Towards zero emission : EVS 24, the 24th International Battery, Hybrid and Fuel Cell Electric Vehicle Symposium & Exhibition, Stavanger, Norway, May 13 - 16, 2009 ; symposium proceedings / organised by AVERE ... Robert Stüssi [Hrsg.] Y1 - 2009 N1 - European Association of Electric Road Vehicles ; EVS ; (24 : ; 2009.05.13-16 : ; Stavanger) CY - Stavanger ER - TY - PAT A1 - Engels, Elmar T1 - Tastatur mit einem magnetisch sensitiven Element : Offenlegungsschrift : DE102007052146A1 ; Offenlegungstag: 07.05.2009 Y1 - 2009 N1 - Volltext über Datenbank: http://publikationen.dpma.de/ PB - Deutsches Patent- und Markenamt CY - München ER - TY - JOUR A1 - Ellerweg, Roland A1 - Ritz, Thomas A1 - Schuhmann, Stefan T1 - Anwendungsentwicklung für iPhone und Windows Mobile : ein bisschen von allem JF - iX : Magazin für professionelle Informationstechnik Y1 - 2009 SN - 0935-9680 (Print) SN - 1612-1392 (Online) IS - 3 SP - 132 EP - 135 ER - TY - JOUR A1 - Elbers, Gereon T1 - Identification of marker peptides in hair for discrimination with regard to species and breed / Koerner, Andrea ; Ring, Maike ; Fabry, Marlies ; Elbers, Gereon ; Moeller, Martin JF - Proceedings of the Aachen-Dresden International Textile Conference, 3rd, Aachen, Germany, Nov. 26-27, 2009 Y1 - 2009 N1 - Aachen-Dresden International Textile Conference ; (3 : ; 2009.11.26-27 : ; Aachen) PB - DWI CY - Aachen ER - TY - CHAP A1 - ElBashir, Rasha A1 - Digel, Ilya T1 - Effect of nitric oxide gas on hydrogels : [abstract] N2 - The results support our theory that the NO gas has an influence in increasing the translational diffusion of hydrogels and it accelerates the melting process of the gels. KW - Stickstoffmonoxid KW - Hydrogel KW - nitric oxide gas KW - hydrogel Y1 - 2009 ER - TY - JOUR A1 - Eilmann, Britta A1 - Zweifel, Roman A1 - Buchmann, Nina A1 - Fonti, Patrick A1 - Rigling, Andreas T1 - Drought-induced adaptation of the xylem in Scots pine and pubescent oak JF - Tree Physiology Y1 - 2009 U6 - https://doi.org/10.1093/treephys/tpp035 SN - 0829-318X (Print) SN - 1758-4469 (Online) VL - 29 IS - 8 SP - 1011 EP - 1020 PB - Heron CY - Victoria, BC ER - TY - RPRT A1 - Döring, Bernd A1 - Kuhnhenne, Markus A1 - Vassart, O. A1 - Harper, C. T1 - Integrated pre-fabricated steel technologies for the multi-storey sector Y1 - 2009 SN - 9789279113192 PB - Office for Official Publ. of the European Communities CY - Luxembourg ER - TY - JOUR A1 - Döring, Bernd A1 - Feldmann, Markus A1 - Kuhnhenne, Markus T1 - Der Beitrag von Profilblechdecken zur passiven Kühlung JF - Bauphysik Y1 - 2009 SN - 1437-0980 (E-Journal); 0171-5445 (Print) N1 - Printausg. in der Bibliothek Bayernallee vorhanden: 13 Z 435 VL - Vol. 31 IS - Iss. 2 SP - 65 EP - 71 PB - Wiley CY - Weinheim ER - TY - JOUR A1 - Dikta, Gerhard A1 - Subramanian, Sundarraman T1 - Inverse censoring weighted median regression / Sundarraman Subramanian and Gerhard Dikta JF - Statistical Methodology. 6 (2009), H. 6 Y1 - 2009 SN - 1572-3127 SP - 594 EP - 603 PB - Elsevier CY - Amsterdam ER - TY - CHAP A1 - Digel, Ilya A1 - Dachwald, Bernd A1 - Artmann, Gerhard A1 - Linder, Peter A1 - Funke, O. T1 - A concept of a probe for particle analysis and life detection in icy environments N2 - A melting probe equipped with autofluorescence-based detection system combined with a light scattering unit, and, optionally, with a microarray chip would be ideally suited to probe icy environments like Europa’s ice layer as well as the polar ice layers of Earth and Mars for recent and extinct live. KW - Sonde KW - Eisschicht KW - Autofluoreszenzverfahren KW - Lichtstreuungsbasierte Instrumente KW - autofluorescence-based detection system KW - light scattering analysis Y1 - 2009 ER - TY - JOUR A1 - Digel, Ilya A1 - Dachwald, Bernd A1 - Artmann, Gerhard A1 - Linder, Peter A1 - Funke, O. T1 - A concept of a probe for particle analysis and life detection in icy environments Y1 - 2009 N1 - International workshop “Europa lander: science goals and experiments”, Space Research Institute (IKI), Moscow, Russia 9-13 February 2009 SP - 1 EP - 24 ER - TY - BOOK A1 - Dielmann, Klaus-Peter T1 - Integration des CROWN-Systems in die Biogasgewinnung [Elektronische Ressource] : Abschlussbericht / K. Dielmann Y1 - 2009 N1 - Förderkennzeichen BMBF 1780X05 PB - FH Aachen, Fachbereich 10 NOWUM-Energy CY - Jülich ER - TY - JOUR A1 - Dethloff, Nina A1 - Kroll-Ludwigs, Kathrin T1 - A Lei de Parceria Registrada de 2001 e suas Reformas no Direito Alemao JF - Revista Brasileira de Direito das Famílias e Sucessoes Y1 - 2009 VL - 11 IS - 12 SP - 80 EP - 94 ER - TY - JOUR A1 - Demirci, Taylan A1 - Kurulgan Demirci, Eylem A1 - Trzewik, Jürgen A1 - Linder, Peter A1 - Digel, Ilya A1 - Artmann, Gerhard A1 - Sakizli, Meral A1 - Temiz Artmann, Aysegül T1 - Gene expression profile analysis of 3T3/NIH fibroblasts after one hour mechanical stress JF - IUBMB Life. 61 (2009), H. 3 Y1 - 2009 SN - 1521-6543 N1 - Abstracts: Turkish Society of Molecular Medicine, Third International Congress of Molecular Medicine, May 5-8, 2009, Istanbul, Turkey SP - 311 EP - 312 PB - Wiley-VCH CY - Weinheim ER - TY - JOUR A1 - Dankelmann, Peter A1 - Hellwig, Angelika A1 - Volkmann, Lutz T1 - Inverse degree and edge-connectivity JF - Discrete mathematics Y1 - 2009 SN - 1872-681X (E-Journal); 0012-365X (Print) VL - Vol. 309 IS - Iss. 9 SP - 2943 EP - 2947 PB - Elsevier CY - Amsterdam ER - TY - CHAP A1 - Dachwald, Bernd A1 - Wurm, P. T1 - Design concept and modeling of an advanced solar photon thruster T2 - Advances in the Astronautical Sciences N2 - The so-called "compound solar sail", also known as "Solar Photon Thruster" (SPT), holds the potential of providing significant performance advantages over the flat solar sail. Previous SPT design concepts, however, do not consider shadowing effects and multiple reflections of highly concentrated solar radiation that would inevitably destroy the gossamer sail film. In this paper, we propose a novel advanced SPT (ASPT) design concept that does not suffer from these oversimplifications. We present the equations that describe the thrust force acting on such a sail system and compare its performance with respect to the conventional flat solar sail. KW - solar sails Y1 - 2009 SN - 978-087703554-1 SN - 00653438 N1 - 19th AAS/AIAA Space Flight Mechanics Meeting; Savannah, GA; United States; 8 February 2009 through 12 February 2009 SP - 723 EP - 740 PB - American Astronautical Society CY - San Diego, Calif. ER - TY - CHAP A1 - Dachwald, Bernd A1 - Wurm, P. T1 - Mission analysis for an advanced solar photon thruster T2 - 60th International Astronautical Congress 2009, IAC 2009 N2 - The so-called "compound solar sail", also known as "Solar Photon Thruster" (SPT), is a solar sail design concept, for which the two basic functions of the solar sail, namely light collection and thrust direction, are uncoupled. In this paper, we introduce a novel SPT concept, termed the Advanced Solar Photon Thruster (ASPT). This model does not suffer from the simplified assumptions that have been made for the analysis of compound solar sails in previous studies. We present the equations that describe the force, which acts on the ASPT. After a detailed design analysis, the performance of the ASPT with respect to the conventional flat solar sail (FSS) is investigated for three interplanetary mission scenarios: An Earth-Venus rendezvous, where the solar sail has to spiral towards the Sun, an Earth-Mars rendezvous, where the solar sail has to spiral away from the Sun, and an Earth-NEA rendezvous (to near-Earth asteroid 1996FG3), where a large orbital eccentricity change is required. The investigated solar sails have realistic near-term characteristic accelerations between 0.1 and 0.2mm/s2. Our results show that a SPT is not superior to the flat solar sail unless very idealistic assumptions are made. KW - Interplanetary flight Y1 - 2009 SN - 978-161567908-9 N1 - 60th International Astronautical Congress 2009, IAC 2009; Daejeon; South Korea; 12 October 2009 through 16 October 2009 VL - 8 SP - 6838 EP - 6851 PB - Elsevier CY - Amsterdam ER - TY - CHAP A1 - Dachwald, Bernd A1 - Ohndorf, Andreas A1 - Spurmann, J. A1 - Loeb, H. W. A1 - Schartner, Karl-Heinz A1 - Seboldt, Wolfgang T1 - Mission design for a SEP mission to saturn T2 - 60th International Astronautical Congress 2009 (IAC 2009) N2 - Within ESA's Cosmic Vision 2015-2025 plan, a mission to explore the Saturnian System, with special emphasis on its two moons Titan and Enceladus, was selected for study, termed TANDEM (Titan and Enceladus Mission). In this paper, we describe an optimized mission design for a TANDEM-derived solar electric propulsion (SEP) mission. We have chosen the SEP mission scenario for the interplanetary transfer of the TANDEM spacecraft because all feasible gravity assist sequences for a chemical transfer between 2015 and 2025 result in long flight times of about nine years. Our SEP system is based on the German RIT ion engine. For our optimized mission design, we have extensively explored the SEP parameter space (specific impulse, thrust level, power level) and have calculated an optimal interplanetary trajectory for each setting. In contrast to the original TANDEM mission concept, which intends to use two launch vehicles and an all-chemical transfer, our SEP mission design requires only a single Ariane 5 ECA launch for the same payload mass. Without gravity assist, it yields a faster and more flexible transfer with a fight time of less than seven years, and an increased payload ratio. Our mission design proves thereby the capability of SEP even for missions into the outer solar system. Y1 - 2009 SN - 978-1-61567-908-9 N1 - 12-16 October 2009, Daejeon, Republic of Korea. PB - Curran Associates, Inc. CY - Red Hook, NY ER - TY - JOUR A1 - Dachwald, Bernd A1 - Ohndorf, A. A1 - Gill, E. T1 - Optimization of low-thrust Earth-Moon transfers using evolutionary neurocontrol / Ohndorf, A. ; Dachwald, B. ; Gill, E. JF - IEEE Congress on Evolutionary Computation, 2009. CEC '09. Y1 - 2009 SN - 978-1-4244-2958-5 SP - 358 EP - 364 ER - TY - JOUR A1 - Dachwald, Bernd A1 - Carnelli, Ian A1 - Vasile, Massimiliano T1 - Evolutionary Neurocontrol: A Novel Method for Low-Thrust Gravity-Assist Trajectory Optimization / Carnelli, Ian ; Dachwald, Bernd ; Vasile, Massimiliano JF - Journal of guidance control and dynamics. 32 (2009), H. 2 Y1 - 2009 SN - 0731-5090 SP - 616 EP - 625 PB - AIAA CY - Reston, Va. ER - TY - JOUR A1 - Dachwald, Bernd A1 - Ball, Andrew J. A1 - Ulamec, Stephan A1 - Price, Michael E. T1 - A small mission for in situ exploration of a primitive binary near-Earth asteroid / Ball, Andrew J. ; Ulamec, Stephan ; Dachwald, Bernd ; Price, Michael E. ; [u.a.] JF - Advances in Space Research. 43 (2009), H. 2 Y1 - 2009 SN - 0273-1177 SP - 317 EP - 324 PB - Elsevier CY - Amsterdam ER -