@inproceedings{WildCzupallaFoerstner2021,
  author    = {Wild, Dominik and Czupalla, Markus and F{\"o}rstner, Roger},
  title     = {Modeling, prediction and test of additive manufactured integral structures with embedded lattice and phase change material applying Infused Thermal Solutions (ITS)},
  series = {ICES104: Advances in Thermal Control Technology},
  booktitle = {ICES104: Advances in Thermal Control Technology},
  publisher = {Texas Tech University},
  address   = {Lubbock, Tex.},
  pages     = {12 Seiten},
  year      = {2021},
  abstract  = {Infused Thermal Solutions (ITS) introduces a method for passive thermal control to stabilize structural components thermally without active heating and cooling systems, but with phase change material (PCM) for thermal energy storage (TES), in combination with lattice - both embedded in additive manufactured functional structures. In this ITS follow-on paper a thermal model approach and associated predictions are presented, related on the ITS functional breadboards developed at FH Aachen. Predictive TES by PCM is provided by a specially developed ITS PCM subroutine, which is applicable in ESATAN. The subroutine is based on the latent heat storage (LHS) method to numerically embed thermo-physical PCM behavior. Furthermore, a modeling approach is introduced to numerically consider the virtual PCM/lattice nodes within the macro-encapsulated PCM voids of the double wall ITS design. Related on these virtual nodes, in-plane and out-of-plane conductive links are defined. The recent additive manufactured ITS breadboard series are thermally cycled in the thermal vacuum chamber, both with and without embedded PCM. Related on breadboard hardware tests, measurement results are compared with predictions and are subsequently correlated. The results of specific simulations and measurements are presented. Recent predictive results of star tracker analyses are also presented in ICES-2021-106, based on this ITS PCM subroutine.},
  language  = {en}
}
@article{WildSchrezenmeierCzupallaetal.2020,
  author    = {Wild, Dominik and Schrezenmeier, Johannes and Czupalla, Markus and F{\"o}rstner, Roger},
  title     = {Thermal Characterization of additive manufactured Integral Structures for Phase Change Applications},
  series = {2020 International Conference on Environmental Systems},
  journal   = {2020 International Conference on Environmental Systems},
  publisher = {Texas Tech University},
  year      = {2020},
  abstract  = {"Infused Thermal Solutions" (ITS) introduces a method for passive thermal control to stabilize structural components thermally without active heating and cooling systems, by using phase change material (PCM) in combination with lattice - both embedded into an additive manufactured integral structure. The technology is currently under development. This paper presents the results of the thermal property measurements performed on additive manufactured ITS breadboards. Within the breadboard campaigns key characteristics of the additive manufactured specimens were derived: Mechanical parameters: specimen impermeability, minimum wall thickness, lattice structure, subsequent heat treatment. Thermal properties: thermo-optical surface properties of the additive manufactured raw material, thermal conductivity and specific heat capacity measurements. As a conclusion the paper introduces an overview of potential ITS hardware applications, expected to increase the thermal performance.},
  language  = {en}
}
@article{WilsonBlome2009,
  author    = {Wilson, T. L. and Blome, Hans-Joachim},
  title     = {The Pioneer anomaly and a rotating G{\"o}del universe},
  series = {Advances in Space Research},
  volume    = {44},
  journal   = {Advances in Space Research},
  number    = {11},
  isbn      = {0273-1177},
  pages     = {1345 -- 1353},
  year      = {2009},
  language  = {en}
}
@article{WilsonBlomeLaFave1996,
  author    = {Wilson, Thomas L and Blome, Hans-Joachim and LaFave, Norman},
  title     = {Astrophysical Cosmology Using a Lunar Ligo},
  series = {Engineering, construction, and operations in space V : proceedings of the Fifth International Conference on Space '96, Albuquerque, New Mexico, June 1-6, 1996 / sponsored by Aerospace Division of the American Society of Civil Engineers ... [et al.]; edite},
  journal   = {Engineering, construction, and operations in space V : proceedings of the Fifth International Conference on Space '96, Albuquerque, New Mexico, June 1-6, 1996 / sponsored by Aerospace Division of the American Society of Civil Engineers ... [et al.]; edite},
  publisher = {The Society},
  address   = {New York},
  isbn      = {0-7844-0177-2},
  pages     = {861 -- 863},
  year      = {1996},
  language  = {en}
}
@article{Wittmann1993,
  author    = {Wittmann, Klaus},
  title     = {The microgravity User Support Centre},
  series = {Space Technology - Industrial and Commercial Applications. 13 (1993), H. 2},
  journal   = {Space Technology - Industrial and Commercial Applications. 13 (1993), H. 2},
  isbn      = {0892-9270},
  pages     = {121 -- 124},
  year      = {1993},
  language  = {en}
}
@article{Wittmann2000,
  author    = {Wittmann, Klaus},
  title     = {Overview of Space Operations at DLR},
  year      = {2000},
  language  = {en}
}
@article{WittmannBewersdorffGoerleretal.1993,
  author    = {Wittmann, Klaus and Bewersdorff, A. and G{\"o}rler, G.P. and Otto, G.},
  title     = {Solidification of silver-germanium alloys in an amorphous matrix aboard the space station Mir},
  series = {Acta Astronautica. 29 (1993), H. 7},
  journal   = {Acta Astronautica. 29 (1993), H. 7},
  isbn      = {0094-5765},
  pages     = {547 -- 552},
  year      = {1993},
  language  = {en}
}
@article{WittmannBibringRosenbaueretal.2007,
  author    = {Wittmann, Klaus and Bibring, J.-P. and Rosenbauer, H. and Boehnhardt, H.},
  title     = {The Rosetta Lander ("Philae") Investigations / Bibring, J.-P. ; Rosenbauer, H. ; Boehnhardt, H. ; [...] Wittmann, K.},
  series = {Space Science Reviews. 128 (2007), H. 1-4},
  journal   = {Space Science Reviews. 128 (2007), H. 1-4},
  isbn      = {0038-6308},
  pages     = {205 -- 220},
  year      = {2007},
  language  = {en}
}
@article{WittmannFeuerbacherUlamecetal.1999,
  author    = {Wittmann, Klaus and Feuerbacher, B. and Ulamec, S. and Rosenbauer, H. (u.a.)},
  title     = {Rosetta Lander - In Situ Characterisation of a Comet Nucleus},
  series = {Acta Astronautica. 45 (1999), H. 4-9},
  journal   = {Acta Astronautica. 45 (1999), H. 4-9},
  isbn      = {0094-5765},
  pages     = {389 -- 395},
  year      = {1999},
  language  = {en}
}
@article{WittmannFortezza1992,
  author    = {Wittmann, Klaus and Fortezza, R.},
  title     = {Telescience opportunities in the precursor flights},
  series = {Space Technology - Industrial and Commercial Applications. 13 (1992), H. 2},
  journal   = {Space Technology - Industrial and Commercial Applications. 13 (1992), H. 2},
  isbn      = {0892-9270},
  pages     = {221 -- 226},
  year      = {1992},
  language  = {en}
}
@article{WittmannGillessenOttoetal.1996,
  author    = {Wittmann, Klaus and Gillessen, F. and Otto, G. and R{\"o}stel, R.},
  title     = {Undercooling and solidification of metallic melts suspended in a non-nucleating matrix: Experiment NUCAL of the German Spacelab Mission D-2},
  series = {Acta Astronautica. 38 (1996), H. 1},
  journal   = {Acta Astronautica. 38 (1996), H. 1},
  isbn      = {0094-5765},
  pages     = {63 -- 68},
  year      = {1996},
  language  = {en}
}
@article{WittmannKehrWillnecker2000,
  author    = {Wittmann, Klaus and Kehr, J. and Willnecker, R.},
  title     = {Decentralized Payload Operations Concept for Columbus},
  year      = {2000},
  language  = {en}
}
@article{WittmannKellWinkleretal.1998,
  author    = {Wittmann, Klaus and Kell, G. and Winkler, F. and G{\"u}nther, M. (u.a.)},
  title     = {High resolution temperature measurement technique for materials sciences experiments in space},
  series = {Acta Astronautica. 43 (1998), H. 7-8},
  journal   = {Acta Astronautica. 43 (1998), H. 7-8},
  isbn      = {0094-5765},
  pages     = {385 -- 395},
  year      = {1998},
  language  = {en}
}
@article{WittmannPadeken1993,
  author    = {Wittmann, Klaus and Padeken, D.},
  title     = {The User Center for Microgravity MUSC - Support for space experiments},
  series = {DLR-Nachrichten. 70 (1993)},
  journal   = {DLR-Nachrichten. 70 (1993)},
  isbn      = {0937-0420},
  pages     = {19 -- 24},
  year      = {1993},
  language  = {en}
}
@article{WittmannSchmidtFeuerbacher1988,
  author    = {Wittmann, Klaus and Schmidt, H. P. and Feuerbacher, B.},
  title     = {Microgravity research and user support in the Space Station era: The Microgravity User Support Centre},
  series = {Acta Astronautica. 17 (1988), H. 11-12},
  journal   = {Acta Astronautica. 17 (1988), H. 11-12},
  isbn      = {0094-5765},
  pages     = {1161 -- 1168},
  year      = {1988},
  language  = {en}
}
@article{WittmannSchmidtPadekenetal.1988,
  author    = {Wittmann, Klaus and Schmidt, H. P. and Padeken, D. and Hildmann, B.},
  title     = {The Microgravity User Support Centre (MUSC)},
  series = {ESA SP. 277 (1988)},
  journal   = {ESA SP. 277 (1988)},
  isbn      = {0379-6566},
  pages     = {525},
  year      = {1988},
  language  = {en}
}
@article{WittmannUlamecRichter1999,
  author    = {Wittmann, Klaus and Ulamec, S and Richter, L},
  title     = {Lander Systems for Planetary Missions},
  series = {Laboratory astrophysics and space research / ed. by P. Ehrenfreund},
  journal   = {Laboratory astrophysics and space research / ed. by P. Ehrenfreund},
  publisher = {Kluwer},
  address   = {Dordrecht [u.a.]},
  isbn      = {0-7923-5338-2},
  pages     = {597 -- 621},
  year      = {1999},
  language  = {en}
}
@article{WittmannUlamecFeuerbacheretal.1995,
  author    = {Wittmann, Klaus and Ulamec, S. and Feuerbacher, B. and Rosenbauer, H.},
  title     = {Technical Challenge, Scientific Thrill: A Long Term Lander on an Active Comet},
  series = {Lunar and Planetary Science. 26 (1995)},
  journal   = {Lunar and Planetary Science. 26 (1995)},
  isbn      = {0270-9511},
  pages     = {1431 -- 1432},
  year      = {1995},
  language  = {en}
}
@article{WittmannUlamecFeuerbacheretal.1997,
  author    = {Wittmann, Klaus and Ulamec, S. and Feuerbacher, B. and Rosenbauer, H. (u.a.)},
  title     = {Rosetta Lander - In Situ Investigation of a Cometary Nucleus},
  series = {Lunar and Planetary Science. 28 (1997)},
  journal   = {Lunar and Planetary Science. 28 (1997)},
  isbn      = {0270-9511},
  pages     = {1461 -- 1462},
  year      = {1997},
  language  = {en}
}
@incollection{WolffSeefeldtBaueretal.2014,
  author    = {Wolff, Nino and Seefeldt, Patric and Bauer, Wolfgang and Fiebig, Christopher and Gerding, Patrick and Parow-Souchon, Kai and Pongs, Anna and Reiffenrath, Matti and Ziemann, Thomas},
  title     = {Alternative application of solar sail technology},
  series = {Advances in solar sailing},
  booktitle = {Advances in solar sailing},
  publisher = {Springer},
  address   = {Berlin},
  isbn      = {978-3-642-34906-5 (Print) ; 978-3-642-34907-2 (E-Book)},
  doi       = {10.1007/978-3-642-34907-2_23},
  pages     = {351 -- 365},
  year      = {2014},
  abstract  = {The development of Gossamer sail structures for solar sails contributes to a large field of future space applications like thin film solar generators, membrane antennas and drag sails. The focus of this paper is the development of a drag sail based on solar sail technology that could contribute to a reduction of space debris in low Earth orbits. The drag sail design and its connections to solar sail development, a first test on a sounding rocket, as well as the ongoing integration of the drag sail into a triple CubeSat is presented.},
  language  = {en}
}