TY  - CHAP
A1  - Grundmann, Jan Thimo
A1  - Bauer, Waldemar
A1  - Boden, Ralf
A1  - Ceriotti, Matteo
A1  - Chand, Suditi
A1  - Cordero, Federico
A1  - Dachwald, Bernd
A1  - Dumont, Etienne
A1  - Grimm, Christian D.
A1  - Heiligers, Jeannette
A1  - Herčík, David
A1  - Hérique, Alain
A1  - Ho, Tra-Mi
A1  - Jahnke, Rico
A1  - Kofman, Wlodek
A1  - Lange, Caroline
A1  - Lichtenheldt, Roy
A1  - McInnes, Colin
A1  - Meß, Jan-Gerd
A1  - Mikschl, Tobias
A1  - Mikulz, Eugen
A1  - Montenegro, Sergio
A1  - Moore, Iain
A1  - Pelivan, Ivanka
A1  - Peloni, Alessandro
A1  - Plettemeier, Dirk
A1  - Quantius, Dominik
A1  - Reershemius, Siebo
A1  - Renger, Thomas
A1  - Riemann, Johannes
A1  - Rogez, Yves
A1  - Ruffer, Michael
A1  - Sasaki, Kaname
A1  - Schmitz, Nicole
A1  - Seboldt, Wolfgang
A1  - Seefeldt, Patric
A1  - Spietz, Peter
A1  - Spröwitz, Tom
A1  - Sznajder, Maciej
A1  - Tóth, Norbert
A1  - Vergaaij, Merel
A1  - Viavattene, Giulia
A1  - Wejmo, Elisabet
A1  - Wiedemann, Carsten
A1  - Wolff, Friederike
A1  - Ziach, Christian
T1  - Flights are ten a sail – Re-use and commonality in the design and system engineering of small spacecraft solar sail missions with modular hardware for responsive and adaptive exploration
T2  - 70th International Astronautical Congress (IAC)
KW  - system engineering
KW  - small solar system body characterisation
KW  - small spacecraft solar sail
KW  - small spacecraft asteroid lander
KW  - responsive space
Y1  - 2019
SN  - 9781713814856
N1  - 70th International Astronautical Congress (IAC), Washington D.C., United States, 21-25 October 2019
SP  - 1
EP  - 7
ER  - 
TY  - JOUR
A1  - Gerhardt, Hans Joachim
A1  - Kramer, C.
A1  - Janssen, L.-J.
T1  - Flow studies of an open jet wind tunnel and comparison with closed and slotted walls
Y1  - 1985
N1  - Konferenz-Einzelbericht: 6th Colloquium on Industrial Aerodynamics, Road Vehicle Aerodynamics,  Fachhochschule Aachen, 19.-21.6.1985
SP  - 7
EP  - 28
ER  - 
TY  - PAT
A1  - Mertens, Josef
A1  - Velden, Alexander van der
A1  - Kelm, Roland
T1  - Flugzeug mit Flügeln, deren maximaler Auftrieb durch steuerbare Flügelkomponenten veränderbar ist : Offenlegungsschrift DE102004045732 ; Offenlegungstag: 30.03.2006 = Aircraft with wings whose maximum lift can be altered by controllable wing components
Y1  - 2006
N1  - Zugleich EP1791755A1. - Volltext über Datenbank: http://publikationen.dpma.de/
PB  - Deutsches Patent- und Markenamt
CY  - München
ER  - 
TY  - CHAP
A1  - Olaru, Alexandra Maria
A1  - Kowalski, Julia
A1  - Sethi, Vaishali
A1  - Blümich, Bernhard
T1  - Fluid Transport in Porous Media probed by Relaxation-Exchange NMR
T2  - 2011 Fall Meeting, AGU, San Francisco, Calif., 5-9 Dec.
Y1  - 2011
N1  - H12B-07; American Geophysical Union
ER  - 
TY  - CHAP
A1  - Barnat, Miriam
A1  - Jänsch, Vanessa K.
T1  - Forschendes Lernen und Studienerfolg: Die Bedeutung epistemischer Neugier
T2  - Forschendes Lernen in der Studieneingangsphase: Empirische Befunde, Fallbeispiele und individuelle Perspektiven
N2  - Forschendes Lernen ist dazu geeignet, epistemische Neugier – definiert als Freude an neuen Erkenntnissen - anzuregen und zu befriedigen. Neben der Selbstwirksamkeit zeigt sich die Neugier als relevant für den Studienerfolg. Allerdings ist bisher nicht geklärt, in welcher Beziehung diese beiden Konstrukte zueinanderstehen.
KW  - Epistemische Neugier
KW  - intrinsische Motivation
KW  - Selbstwirksamkeit
Y1  - 2019
SN  - 978-3-658-25312-7
U6  - http://dx.doi.org/10.1007/978-3-658-25312-7_6
SP  - 99
EP  - 109
PB  - Springer VS
CY  - Wiesbaden
ER  - 
TY  - CHAP
A1  - Barnat, Miriam
A1  - Mergner, Julia
T1  - Forschungsbasierte Qualitätsentwicklung am Beispiel der Analyse von Lernprozessen und der Wirksamkeit von Förderprogrammen
T2  - 3. Internationale Tagung für Qualitätsmanagement und Qualitätsentwicklung im Hochschulbereich 2.-3. Februar 2017
Y1  - 2017
ER  - 
TY  - JOUR
A1  - Hammer, Thorben
A1  - Quitter, Julius
A1  - Mayntz, Joscha
A1  - Bauschat, J.-Michael
A1  - Dahmann, Peter
A1  - Götten, Falk
A1  - Hille, S.
A1  - Stumpf, E.
T1  - Free fall drag estimation of small-scale multirotor unmanned aircraft systems using computational fluid dynamics and wind tunnel experiments
JF  - CEAS Aeronautical Journal
N2  - New European Union (EU) regulations for UAS operations require an operational risk analysis, which includes an estimation of the potential danger of the UAS crashing. A key parameter for the potential ground risk is the kinetic impact energy of the UAS. The kinetic energy depends on the impact velocity of the UAS and, therefore, on the aerodynamic drag and the weight during free fall. Hence, estimating the impact energy of a UAS requires an accurate drag estimation of the UAS in that state. The paper at hand presents the aerodynamic drag estimation of small-scale multirotor UAS. Multirotor UAS of various sizes and configurations were analysed with a fully unsteady Reynolds-averaged Navier–Stokes approach. These simulations included different velocities and various fuselage pitch angles of the UAS. The results were compared against force measurements performed in a subsonic wind tunnel and provided good consistency. Furthermore, the influence of the UAS`s fuselage pitch angle as well as the influence of fixed and free spinning propellers on the aerodynamic drag was analysed. Free spinning propellers may increase the drag by up to 110%, depending on the fuselage pitch angle. Increasing the fuselage pitch angle of the UAS lowers the drag by 40% up to 85%, depending on the UAS. The data presented in this paper allow for increased accuracy of ground risk assessments.
KW  - Multirotor UAS
KW  - Drag estimation
KW  - CFD
KW  - Wind tunnel experiments
KW  - Wind milling
Y1  - 2023
U6  - http://dx.doi.org/10.1007/s13272-023-00702-w
SN  - 1869-5590 (Online)
SN  - 1869-5582 (Print)
N1  - Corresponding author: Thorben Hammer
PB  - Springer
CY  - Wien
ER  - 
TY  - CHAP
A1  - Grundmann, Jan Thimo
A1  - Bauer, Waldemar
A1  - Biele, Jens
A1  - Cordero, Frederico
A1  - Dachwald, Bernd
A1  - Koncz, Alexander
A1  - Krause, Christian
A1  - Mikschl, Tobias
A1  - Montenegro, Sergio
A1  - Quantius, Dominik
A1  - Ruffer, Michael
A1  - Sasaki, Kaname
A1  - Schmitz, Nicole
A1  - Seefeldt, Patric
A1  - Tóth, Norbert
A1  - Wejmo, Elisabet
T1  - From Sail to Soil – Getting Sailcraft Out of the Harbour on a Visit to One of Earth’s Nearest Neighbours
T2  - 4th IAA Planetary Denfense Conference - PDC 2015,  13-17 April 2015, Frascati, Roma, Italy
Y1  - 2015
ER  - 
TY  - JOUR
A1  - Götten, Falk
A1  - Finger, Felix
A1  - Havermann, Marc
A1  - Braun, Carsten
A1  - Marino, M.
A1  - Bil, C.
T1  - Full configuration drag estimation of short-to-medium range fixed-wing UAVs and its impact on initial sizing optimization
JF  - CEAS Aeronautical Journal
N2  - The paper presents the derivation of a new equivalent skin friction coefficient for estimating the parasitic drag of short-to-medium range fixed-wing unmanned aircraft. The new coefficient is derived from an aerodynamic analysis of ten different unmanned aircraft used for surveillance, reconnaissance, and search and rescue missions. The aircraft is simulated using a validated unsteady Reynolds-averaged Navier Stokes approach. The UAV’s parasitic drag is significantly influenced by the presence of miscellaneous components like fixed landing gears or electro-optical sensor turrets. These components are responsible for almost half of an unmanned aircraft’s total parasitic drag. The new equivalent skin friction coefficient accounts for these effects and is significantly higher compared to other aircraft categories. It is used to initially size an unmanned aircraft for a typical reconnaissance mission. The improved parasitic drag estimation yields a much heavier unmanned aircraft when compared to the sizing results using available drag data of manned aircraft.
KW  - Parasitic drag
KW  - UAV
KW  - CFD
KW  - Aircraft sizing
Y1  - 2021
U6  - http://dx.doi.org/10.1007/s13272-021-00522-w
SN  - 1869-5590 (Online)
SN  - 1869-5582 (Print)
N1  - Corresponding author: Falk Götten
VL  - 12
SP  - 589
EP  - 603
PB  - Springer
CY  - Berlin
ER  - 
TY  - CHAP
A1  - Götten, Falk
A1  - Finger, Felix
A1  - Havermann, Marc
A1  - Braun, Carsten
A1  - Marino, Matthew
A1  - Bil, Cees
T1  - Full Configuration Drag Estimation of Small-to-Medium Range UAVs and its Impact on Initial Sizing Optimization
T2  - Deutscher Luft- und Raumfahrtkongress - DLRK 2020
Y1  - 2020
ER  - 
TY  - JOUR
A1  - Neu, Eugen
A1  - Janser, Frank
A1  - Khatibi, Akbar A.
A1  - Orifici, Adrian C.
T1  - Fully Automated Operational Modal Analysis using multi-stage clustering
JF  - Mechanical Systems and Signal Processing
Y1  - 2017
U6  - http://dx.doi.org/10.1016/j.ymssp.2016.07.031
SN  - 0888-3270
VL  - Vol. 84, Part A
SP  - 308
EP  - 323
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Dachwald, Bernd
A1  - Turyshev, Slava G.
A1  - Dittus, H.
A1  - Shao, M. [u.a.]
T1  - Fundamental Physics with the Laser Astrometric Test Of Relativity / S.G. Turyshev ;  H. Dittus ; M. Shao ... B.Dachwald ...
JF  - Proceedings of the 39th ESLAB Symposium "Trends in Space Science and Cosmic Vision 2020" : 19 - 21 April 2005, ESTEC, Noordwijk, the Netherlands / European Space Agency. [Comp. by: F. Favata ...] . - (ESA SP ; 588)
Y1  - 2005
SN  - 9290928999
N1  - ISBN der CD-ROM-Ausg.: 9290928999 ; Symposium Trends in Space Science and Cosmic Vision 2020 <2005, Noordwijk> ; ESLAB symposium <39, 2005, Noordwijk> ; European Space Laboratory
SP  - 8
EP  - 11
PB  - ESA Publ. Div.
CY  - Noordwijk
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  - JOUR
A1  - Dahmann, Peter
T1  - Funktionsweise von Hydraulikfiltern
JF  - Ölhydraulik und Pneumatik. 37 (1993), H. 2
Y1  - 1993
SN  - 0341-2660
SP  - 118
EP  - 122
ER  - 
TY  - JOUR
A1  - Esch, Thomas
A1  - Göbel, T.
T1  - Gemischbildung bei drosselfreier Laststeuerung von Ottomotoren
JF  - Motortechnische Zeitschrift. 54 (1993), H. 12
Y1  - 1993
SN  - 0024-8525
SP  - 616
EP  - 618
ER  - 
TY  - CHAP
A1  - Roosen, Petra
A1  - Feyerl, Günter
T1  - Gender-specific perception and utilization of personal use vehicles
T2  - FISITA World Automotive Congress 2014 : Maastricht, The Netherlands, 2 - 6 June / [organised by the International Federation of Automotive Engineering Societies (FISITA) ...]. Bd. 1
Y1  - 2015
SN  - 978-1-5108-0209-4
SP  - 418
EP  - 425
PB  - Curran
CY  - Red Hook, NY
ER  - 
TY  - JOUR
A1  - Dahmann, Peter
A1  - Hagemeister, Wilhelm
A1  - Nagel, Günther
A1  - Exner, Peter
T1  - Geregelte Innenzahnradpumpe im Mehrquadrantenbetrieb Geschwindigkeits- und Positionsregelung eines hydraulischen Handlinggerätes
JF  - O+P Ölhydraulik und Pneumatik. 24 (2006), H. 1
Y1  - 2006
SN  - 0341-2660
SP  - 24
EP  - 28
ER  - 
TY  - JOUR
A1  - Dahmann, Peter
A1  - Hagemeister, W.
A1  - Nagel, 
A1  - Exner, 
T1  - Geschwindigkeits- und Positionsregelung eines hydraulischen Handlinggerätes in einem Ziegelwerk durch frequenzgeregelte Innenzahnradpumpe im Mehrquadrantenbetrieb
JF  - Fluid power focused on applications : 3rd International Fluid Power Conference (3rd IFK) ; [conference proceedings, March 5th and 6th 2002, Aachen, Germany]. Fluidtechnik, Band T3
Y1  - 2002
SN  - 3-8265-9900-4
N1  - Konferenz-Einzelbericht
SP  - 83
EP  - 94
PB  - Shaker
CY  - Aachen
ER  - 
TY  - PAT
A1  - Wahle, Michael
T1  - Gestaltung von plattenförmigen Hohlprofilen oder wellblechartigen Profilen : Offenlegungsschrift / Europäische Patentschrift
T1  - Configuration of panel-shaped hollow profiles : patent of invention
Y1  - 1989
PB  - Deutsches Patent- und Markenamt / Europäisches Patentamt
CY  - München / Den Hague
ER  - 
TY  - CHAP
A1  - Dachwald, Bernd
A1  - Ohndorf, Andreas
T1  - Global optimization of continuous-thrust trajectories using evolutionary neurocontrol
T2  - Modeling and Optimization in Space Engineering
N2  - Searching optimal continuous-thrust trajectories is usually a difficult and time-consuming task. The solution quality of traditional optimal-control methods depends strongly on an adequate initial guess because the solution is typically close to the initial guess, which may be far from the (unknown) global optimum. Evolutionary neurocontrol attacks continuous-thrust optimization problems from the perspective of artificial intelligence and machine learning, combining artificial neural networks and evolutionary algorithms. This chapter describes the method and shows some example results for single- and multi-phase continuous-thrust trajectory optimization problems to assess its performance. Evolutionary neurocontrol can explore the trajectory search space more exhaustively than a human expert can do with traditional optimal-control methods. Especially for difficult problems, it usually finds solutions that are closer to the global optimum. Another fundamental advantage is that continuous-thrust trajectories can be optimized without an initial guess and without expert supervision.
Y1  - 2019
SN  - 978-3-030-10501-3
SN  - 978-3-030-10500-6
U6  - http://dx.doi.org/10.1007/978-3-030-10501-3_2
N1  - Springer Optimization and Its Applications, vol 144
gedruckt unter der Signatur 21 ZSS 46 in der Bereichsbibliothek Eupener Str. vorhanden
SP  - 33
EP  - 57
PB  - Springer
CY  - Cham
ER  - 
TY  - CHAP
A1  - Dachwald, Bernd
T1  - Global optimization of low-thrust space missions using evolutionary neurocontrol
T2  - Proceedings of the international workshop on global optimization
N2  - Low-thrust space propulsion systems enable flexible high-energy deep space missions, but the design and optimization of the interplanetary transfer trajectory is usually difficult. It involves much experience and expert knowledge because the convergence behavior of traditional local trajectory optimization methods depends strongly on an adequate initial guess. Within this extended abstract, evolutionary neurocontrol, a method that fuses artificial neural networks and evolutionary algorithms, is proposed as a smart global method for low-thrust trajectory optimization. It does not require an initial guess. The implementation of evolutionary neurocontrol is detailed and its performance is shown for an exemplary mission.
KW  - Evolutionary Neurocontrol
KW  - Spacecraft Trajectory Optimization
KW  - Low-Thrust Propulsion
Y1  - 2005
SP  - 85
EP  - 90
ER  - 
TY  - CHAP
A1  - Dachwald, Bernd
A1  - Boehnhardt, Herrmann
A1  - Broj, Ulrich
A1  - Geppert, Ulrich R. M. E.
A1  - Grundmann, Jan-Thimo
A1  - Seboldt, Wolfgang
A1  - Seefeldt, Patric
A1  - Spietz, Peter
A1  - Johnson, Les
A1  - Kührt, Ekkehard
A1  - Mottola, Stefano
A1  - Macdonald, Malcolm
A1  - McInnes, Colin R.
A1  - Vasile, Massimiliano
A1  - Reinhard, Ruedeger
T1  - Gossamer roadmap technology reference study for a multiple NEO Rendezvous Mission
T2  - Advances in solar sailing
N2  - A technology reference study for a multiple near-Earth object (NEO) rendezvous mission with solar sailcraft is currently carried out by the authors of this paper. The investigated mission builds on previous concepts, but adopts a strong micro-spacecraft philosophy based on the DLR/ESA Gossamer technology. The main scientific objective of the mission is to explore the diversity of NEOs. After direct interplanetary insertion, the solar sailcraft should—within less than 10 years—rendezvous three NEOs that are not only scientifically interesting, but also from the point of human spaceight and planetary defense. In this paper, the objectives of the study are outlined and a preliminary potential mission profile is presented.
Y1  - 2014
SN  - 978-3-642-34906-5 (Print) ; 978-3-642-34907-2 (E-Book)
SP  - 211
EP  - 226
PB  - Springer
CY  - Berlin [u.a.]
ER  - 
TY  - CHAP
A1  - Macdonald, Malcolm
A1  - McGrath, C.
A1  - Appourchaux, T.
A1  - Dachwald, Bernd
A1  - Finsterle, W.
A1  - Gizon, L.
A1  - Liewer, P. C.
A1  - McInnes, Colin R.
A1  - Mengali, G.
A1  - Seboldt, W.
A1  - Sekii, T.
A1  - Solanki, S. K.
A1  - Velli, M.
A1  - Wimmer-Schweingruber, R. F.
A1  - Spietz, Peter
A1  - Reinhard, Ruedeger
ED  - Macdonald, Malcolm
T1  - Gossamer roadmap technology reference study for a solar polar mission
T2  - Advances in solar sailing
N2  - A technology reference study for a solar polar mission is presented. The study uses novel analytical methods to quantify the mission design space including the required sail performance to achieve a given solar polar observation angle within a given timeframe and thus to derive mass allocations for the remaining spacecraft sub-systems, that is excluding the solar sail sub-system. A parametric, bottom-up, system mass budget analysis is then used to establish the required sail technology to deliver a range of science payloads, and to establish where such payloads can be delivered to within a given timeframe. It is found that a solar polar mission requires a solar sail of side-length 100–125 m to deliver a ‘sufficient value’ minimum science payload, and that a 2.5 μm sail film substrate is typically required, however the design is much less sensitive to the boom specific mass.
Y1  - 2014
SN  - 978-3-642-34906-5
U6  - http://dx.doi.org/10.1007/978-3-642-34907-2_17
SP  - 243
EP  - 257
PB  - Springer
CY  - Berlin, Heidelberg
ER  - 
TY  - CHAP
A1  - McInnes, Colin R.
A1  - Bothmer, Volker
A1  - Dachwald, Bernd
A1  - Geppert, Ulrich R. M. E.
A1  - Heiligers, Jeannette
A1  - Hilgers, Alan
A1  - Johnson, Les
A1  - Macdonald, Malcolm
A1  - Reinhard, Ruedeger
A1  - Seboldt, Wolfgang
A1  - Spietz, Peter
T1  - Gossamer roadmap technology reference study for a Sub-L1 Space Weather Mission
T2  - Advances in solar sailing
N2  - A technology reference study for a displaced Lagrange point space weather mission is presented. The mission builds on previous concepts, but adopts a strong micro-spacecraft philosophy to deliver a low mass platform and payload which can be accommodated on the DLR/ESA Gossamer-3 technology demonstration mission. A direct escape from Geostationary Transfer Orbit is assumed with the sail deployed after the escape burn. The use of a miniaturized, low mass platform and payload then allows the Gossamer-3 solar sail to potentially double the warning time of space weather events. The mission profile and mass budgets will be presented to achieve these ambitious goals.
Y1  - 2014
SN  - 978-3-642-34906-5 (Print) ; 978-3-642-34907-2 (E-Book)
SP  - 227
EP  - 242
PB  - Springer
CY  - Berlin [u.a.]
ER  - 
TY  - BOOK
A1  - Wahle, Michael
T1  - Grundlagen der Maschinen- und Strukturdynamik. - (Höhere Technische Mechanik ; 2)
Y1  - 1998
SN  - 3-89653-391-6
N1  - 2. Aufl.
PB  - Verl. Mainz
CY  - Aachen
ER  - 
TY  - BOOK
A1  - Wahle, Michael
T1  - Grundlagen der Maschinen- und Strukturdynamik. - (Höhere Technische Mechanik ; 2)
Y1  - 1995
SN  - 3-930911-61-2
PB  - Mainz
CY  - Aachen
ET  - 1. Aufl.
ER  - 
TY  - CHAP
A1  - Hallmann, Marcus
A1  - Heidecker, Ansgar
A1  - Schlotterer, Markus
A1  - Dachwald, Bernd
T1  - GTOC8: results and methods of team 15 DLR
T2  - 26th AAS/AIAA Space Flight Mechanics Meeting, Napa, CA
N2  - This paper describes the results and methods used during the 8th Global Trajectory Optimization Competition (GTOC) of the DLR team. Trajectory optimization is crucial for most of the space missions and usually can be formulated as a global optimization problem. A lot of research has been done to different type of mission problems. The most demanding ones are low thrust transfers with e.g. gravity assist sequences. In that case the optimal control problem is combined with an integer problem. In most of the GTOCs we apply a filtering of the problem based on domain knowledge.
Y1  - 2016
N1  - 26th AAS/AIAA Space Flight Mechanics Meeting, February 14-18, 2016, Napa, California, U.S.A. Napa, CA
ER  - 
TY  - JOUR
A1  - Röth, Thilo
A1  - Nowack, Niels
A1  - Oberschelp, Christian
A1  - Lao, Bin
T1  - Gute Perspektiven für Stahl-Alumnium-Hybride im Automotivebereich / Nowack, Niels ; Oberschelp, Christian ; Lao, Bin ; Klaus, Gerald ; Bührig-Polaczek, Andreas ; Röth, Thilo
JF  - Giesserei : die Zeitschrift für Technik, Innovation und Management. 96 (2009), H. 5
Y1  - 2009
SN  - 0016-9765
SP  - 110
EP  - 123
ER  - 
TY  - JOUR
A1  - Polaczek, Christa
A1  - Henn, Gudrun
T1  - Gute Vorkenntnisse verkürzen die Studienzeit
JF  - Mathematikinformation : eine Zeitschrift von Begabtenförderung Mathematik e.V.
Y1  - 2008
SN  - 1612-9156
VL  - 2008
IS  - 49
SP  - 46
EP  - 50
PB  - Begabtenförderung Mathematik
CY  - Neubiberg
ER  - 
TY  - BOOK
A1  - Ley, Wilfried
A1  - Wittmann, Klaus
A1  - Hallmann, Willi
T1  - Handbook of space technology
Y1  - 2009
SN  - 978-0-470-69739-9
PB  - Wiley
CY  - Chichester
ER  - 
TY  - BOOK
ED  - Ley, Wilfried
ED  - Hallmann, Willi
ED  - Wittmann, Klaus
T1  - Handbuch der Raumfahrttechnik
Y1  - 2019
SN  - 978-3-446-45429-3
N1  - gedruckt in der Bereichsbibliothek Eupener Str. vorhanden
PB  - Hanser
CY  - München
ET  - 5. Auflage
ER  - 
TY  - BOOK
A1  - Ley, Wilfried
T1  - Handbuch der Raumfahrttechnik / Ley, Wilfried ; Wittmann, Klaus ; Hallmann, Willi [Hrsg.]
Y1  - 2008
SN  - 978-3-446-41185-2
PB  - Hanser
CY  - München
ER  - 
TY  - BOOK
A1  - Ley, Wilfried
T1  - Handbuch der Raumfahrttechnik : Grundlagen - Nutzung, Raumfahrtsysteme - Produktsicherung u. Produktmanagement / Willi Hallmann; Wilfried Ley
Y1  - 1988
SN  - 3446151303
PB  - Hanser
CY  - München [u.a.]
ER  - 
TY  - BOOK
A1  - Wittmann, Klaus
A1  - Ley, Wilfried [Hrsg.]
A1  - Hallmann, Willi [Hrsg.]
T1  - Handbuch der Raumfahrttechnik : mit 128 Tabellen / Wilfried Ley; Klaus Wittmann; Willi Hallmann (Hrsg.) 3., völlig neu bearb. und erw. Aufl.
Y1  - 2008
SN  - 978-3-446-41185-2
PB  - Hanser
CY  - München
ER  - 
TY  - CHAP
A1  - Dachwald, Bernd
A1  - Kahle, Ralph
A1  - Wie, Bong
T1  - Head-on impact deflection of NEAs: a case study for 99942 Apophis
T2  - Planetary Defense Conference 2007
N2  - Near-Earth asteroid (NEA) 99942 Apophis provides a typical example for the evolution of asteroid orbits that lead to Earth-impacts after a close Earth-encounter that results in a resonant return. Apophis will have a close Earth-encounter in 2029 with potential very close subsequent Earth-encounters (or even an impact) in 2036 or later, depending on whether it passes through one of several less than 1 km-sized gravitational keyholes during its 2029-encounter. A pre-2029 kinetic impact is a very favorable option to nudge the asteroid out of a keyhole. The highest impact velocity and thus deflection can be achieved from a trajectory that is retrograde to Apophis orbit. With a chemical or electric propulsion system, however, many gravity assists and thus a long time is required to achieve this. We show in this paper that the solar sail might be the better propulsion system for such a mission: a solar sail Kinetic Energy Impactor (KEI) spacecraft could impact Apophis from a retrograde trajectory with a very high relative velocity (75-80 km/s) during one of its perihelion passages. The spacecraft consists of a 160 m × 160 m, 168 kg solar sail assembly and a 150 kg impactor. Although conventional spacecraft can also achieve the required minimum deflection of 1 km for this approx. 320 m-sized object from a prograde trajectory, our solar sail KEI concept also allows the deflection of larger objects. For a launch in 2020, we also show that, even after Apophis has flown through one of the gravitational keyholes in 2029, the solar sail KEI concept is still feasible to prevent Apophis from impacting the Earth, but many KEIs would be required for consecutive impacts to increase the total Earth-miss distance to a safe value
Y1  - 2007
N1  - Planetary Defense Conference 2007, Wahington D.C., USA, 05-08 March 2007
SP  - 1
EP  - 12
ER  - 
TY  - CHAP
A1  - Haugg, Albert Thomas
A1  - Kreyer, Jörg
A1  - Kemper, Hans
A1  - Hatesuer, Katerina
A1  - Esch, Thomas
T1  - Heat exchanger for ORC. adaptability and optimisation potentials
T2  - IIR International Rankine 2020 Conference
N2  - The recovery of waste heat requires heat exchangers to extract it from a liquid or gaseous medium into another working medium, a refrigerant. In Organic Rankine Cycles (ORC) on Combustion Engines there are two major heat sources, the exhaust gas and the water/glycol fluid from the engine’s cooling circuit. A heat exchanger design must be adapted to the different requirements and conditions resulting from the heat sources, fluids, system configurations, geometric restrictions, and etcetera. The Stacked Shell Cooler (SSC) is a new and very specific design of a plate heat exchanger, created by AKG, which allows with a maximum degree of freedom the optimization of heat exchange rate and the reduction of the related pressure drop. This optimization in heat exchanger design for ORC systems is even more important, because it reduces the energy consumption of the system and therefore maximizes the increase in overall efficiency of the engine.
Y1  - 2020
U6  - http://dx.doi.org/10.18462/iir.rankine.2020.1224
N1  - Conference: IIR International Rankine 2020 Conference - Heating, Cooling, Power Generation. Glasgow, 2020.
ER  - 
TY  - JOUR
A1  - Dachwald, Bernd
A1  - MacDonald, Malcolm
A1  - McInnes, Colin R.
T1  - Heliocentric Solar Sail Orbit Transfers with Locally Optimal Control Laws / Malcolm Macdonald ; Colin McInnes ; Bernd Dachwald
JF  - Journal of Spacecraft and Rockets. 44 (2007), H. 1
Y1  - 2007
SN  - 0022-4650
SP  - 273
EP  - 276
ER  - 
TY  - JOUR
A1  - Leipold, M.
A1  - Fichtner, H.
A1  - Heber, B.
A1  - Groepper, P.
A1  - Lascar, S.
A1  - Burger, F.
A1  - Eiden, M.
A1  - Niederstadt, T.
A1  - Sickinger, C.
A1  - Herbeck, L.
A1  - Dachwald, Bernd
A1  - Seboldt, W.
T1  - Heliopause Explorer - A Sailcraft Mission to the Outer Boundaries of the Solar System
JF  - Acta Astronautica. 59 (2006), H. 8-11
Y1  - 2006
SN  - 0094-5765
N1  - International Conference on Low Cost Planetary Missions <5, 2003, Noordwijk> ; Selected Proceedings
SP  - 786
EP  - 796
ER  - 
TY  - JOUR
A1  - Dachwald, Bernd
A1  - Leipold, M.
A1  - Fichtner, H.
T1  - Heliopause Explorer - A Sailcraft Mission to the Outer Boundaries of the Solar System / M. Leipold ; H. Fichtner ; B. Heber  ... B. Dachwald ...
JF  - Proceedings of the Fifth IAA International Conference on Low Cost Planetary Missions : 24 - 26 September 2003, ESTEC, Noordwijk, the Netherlands / [comp. by R. A. Harris]
Y1  - 2003
SN  - 92-9092-853-0
N1  - International Conference on Low Cost Planetary Missions <5, 2003, Noordwijk> ; International Academy of Astronautics ; European Space Research and Technology Centre
SP  - 367
EP  - 375
PB  - ESA
CY  - Noordwijk
ER  - 
TY  - THES
A1  - Weber, Tobias
T1  - Herstellprozesssimulation zur Vorhersage der Faltenbildung in der Prepreg-Autoklav-Fertigung
Y1  - 2019
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:386-kluedo-54923
SN  - 978-3-944440-24-8
N1  - Dissertation, Kaiserslautern, Technische Universität Kaiserslautern, 2017
PB  - Technische Universität Kaiserslautern
CY  - Kaiserslautern
ER  - 
TY  - JOUR
A1  - Barnat, Miriam
A1  - Faria, Joana Abelha
A1  - Bosse, Elke
T1  - Heterogenität und Studierfähigkeit: Erste Ergebnisse einer Längsschnittbefragung
JF  - Qualität in der Wissenschaft: QiW ; Zeitschrift für Qualitätsentwicklung in Forschung, Studium und Administration
Y1  - 2017
SN  - 1860-3041
N1  - gedruckt in der Bereichsbibliothek Eupener Str. vorhanden
VL  - 11
IS  - 1
SP  - 17
EP  - 24
PB  - UVW Universitäts-Verlag Webler
CY  - Bielefeld
ER  - 
TY  - JOUR
A1  - Wittmann, Klaus
A1  - Kell, G.
A1  - Winkler, F.
A1  - Günther, M. (u.a.)
T1  - High resolution temperature measurement technique for materials sciences experiments in space
JF  - Acta Astronautica. 43 (1998), H. 7-8
Y1  - 1998
SN  - 0094-5765
SP  - 385
EP  - 395
ER  - 
TY  - CHAP
A1  - Quitter, Julius
A1  - Marino, Matthew
A1  - Bauschat, J.-Michael
T1  - Highly Non-Planar Aircraft Configurations: Estimation of Flight Mechanical Derivatives Using Low-Order Methods
T2  - Deutscher Luft- und Raumfahrtkongress 2019, DLRK 2019. Darmstadt, Germany
Y1  - 2019
ER  - 
TY  - JOUR
A1  - Schirra, Julian
A1  - Watmuff, Jonathan
A1  - Bauschat, J.-Michael
T1  - Highly non-planar lifting systems: a relative assessment of existing potential-methodologies to accurately estimate the induced drag
JF  - 32nd  AIAA Applied Aerodynamics Conference 2014 : June, 16-20 2014, Atlanta, Ga.
Y1  - 2014
SN  - 978-1-62410-288-2
U6  - http://dx.doi.org/10.2514/6.2014-2988
SP  - Publ. online
ER  - 
TY  - JOUR
A1  - Bullerschen, Klaus-Gerd
A1  - Léonard, G.
T1  - Hochtemperaturtechnik
JF  - Chemie Ingenieur Technik. 62 (1990), H. 3
Y1  - 1990
SN  - 0009-286X
SP  - 252
EP  - 256
ER  - 
TY  - JOUR
A1  - Bullerschen, Klaus-Gerd
T1  - Hochtemperaturtechnik. Interne Arbeitssitzung des GVC-Fachausschusses 'Hochtemperaturtechnik'
JF  - Chemie Ingenieur Technik. 61 (1989), H. 6
Y1  - 1989
SN  - 0009-286X
SP  - 510
EP  - 512
ER  - 
TY  - CHAP
A1  - Peterson, Leif Arne
A1  - Röth, Thilo
A1  - Uibel, Thomas
ED  - Uibel, Thormas
ED  - Peterson, Leif Arne
ED  - Baumann, Marcus
T1  - Holzwerkstoffe in Karosseriestrukturen
T2  - Tagungsband Aachener Holzbautagung 2017
Y1  - 2017
SN  - 2197-4489
SP  - 34
EP  - 45
ER  - 
TY  - JOUR
A1  - Bohndick, Carla
A1  - Bosse, Elke
A1  - Jänsch, Vanessa K.
A1  - Barnat, Miriam
T1  - How different diversity factors affect the perception of first-year requirements in higher education
JF  - Frontline Learning Research
N2  - In the light of growing university entry rates, higher education institutions not only serve larger numbers of students, but also seek to meet first-year students’ ever more diverse needs. Yet to inform universities how to support the transition to higher education, research only offers limited insights. Current studies tend to either focus on the individual factors that affect student success or they highlight students’ social background and their educational biography in order to examine the achievement of selected, non-traditional groups of students. Both lines of research appear to lack integration and often fail to take organisational diversity into account, such as different types of higher education institutions or degree programmes. For a more comprehensive understanding of student diversity, the present study includes individual, social and organisational factors. To gain insights into their role for the transition to higher education, we examine how the different factors affect the students’ perception of the formal and informal requirements of the first year as more or less difficult to cope with. As the perceived requirements result from both the characteristics of the students and the institutional context, they allow to investigate transition at the interface of the micro and the meso level of higher education. Latent profile analyses revealed that there are no profiles with complex patterns of perception of the first-year requirements, but the identified groups rather differ in the overall level of perceived challenges. Moreover, SEM indicates that the differences in the perception largely depend on the individual factors self-efficacy and volition.
Y1  - 2021
U6  - http://dx.doi.org/10.14786/flr.v9i2.667
SN  - 2295-3159
VL  - 9
IS  - 2
SP  - 78
EP  - 95
PB  - EARLI
ER  - 
TY  - JOUR
A1  - Baums, Bodo
T1  - Hubschrauberzellen aus Faserverbund-Werkstoffen
JF  - Kunststoffe. 82 (1992), H. 11
Y1  - 1992
SN  - 0023-5563
SP  - 1114
EP  - 1118
ER  - 
TY  - CHAP
A1  - Bührig-Polaczek, Andreas
A1  - Röth, Thilo
A1  - Baumeister, E.
A1  - Nowack, N.
A1  - Süßmann, Torsten
T1  - Hybride Leichtbaustrukturen in Stahlblech-Leichtmetall Verbundguss
N2  - Stahl-Leichtmetall-Hybride mit hohen Leistungspotentialen können heute wirtschaftlich abgebildet werden und eignen sich möglicherweise auch zum Einsatz in Fahrzeugkarosserien
KW  - Karosseriebau
KW  - Verbundguss
KW  - Stahlblech-Leichtmetall Verbundguss
KW  - Stahlblech-Leichtmetall-Hybride
KW  - Lightweight car body construction
Y1  - 2006
ER  -