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  - JOUR
A1  - Waller, Mark P.
A1  - Braun, Heiko
A1  - Hojdis, Nils
A1  - Bühl, Michael
T1  - Geometries of Second-Row Transition-Metal Complexes from Density-Functional Theory
JF  - Journal of Chemical Theory and Computation
Y1  - 2007
U6  - https://doi.org/10.1021/ct700178y
SN  - 1549-9626
VL  - 3
IS  - 6
SP  - 2234
EP  - 2242
ER  - 
TY  - JOUR
A1  - Göddeke, Dominik
A1  - Strzodka, Robert
A1  - Mohd-Yusof, Jamaludin
A1  - McCormick, Patrick
A1  - Buijssen, Sven H.M.
A1  - Grajewski, Matthias
A1  - Turek, Stefan
T1  - Exploring weak scalability for FEM calculations on a GPU-enhanced cluster
JF  - Parallel Computing
Y1  - 2007
U6  - https://doi.org/10.1016/j.parco.2007.09.002
SN  - 0167-8191
VL  - 33
IS  - 10-11
SP  - 685
EP  - 699
ER  - 
TY  - CHAP
A1  - Matcha, Heike
T1  - Parametric possibilities: designing with parametric modelling
T2  - Predicting the Future [25th eCAADe Conference Proceedings]
Y1  - 2007
SN  - 978-0-9541183-6-5
SP  - 849
EP  - 856
ER  - 
TY  - CHAP
A1  - Matcha, Heike
ED  - Hauschild, Moritz
ED  - Karzel, Rüdiger
T1  - Parametrischer Gebäudeentwurf
T2  - Parametrik, Strategie, Produktion: Von der digitalen Planung zur technischen Umsetzung
Y1  - 2007
SP  - 14
EP  - 15
PB  - Technische Universität Darmstadt
CY  - Darmstadt
ER  - 
TY  - CHAP
A1  - Matcha, Heike
ED  - Hauschild, Moritz
ED  - Karzel, Rüdiger
T1  - Vom Industriellen Bauen zu parametrischen Planungsprozessen
T2  - Parametrik, Strategie, Produktion: Von der digitalen Planung zur technischen Umsetzung
Y1  - 2007
SP  - 12
EP  - 13
PB  - Technische Universität Darmstadt
CY  - Darmstadt
ER  - 
TY  - BOOK
A1  - Matcha, Heike
T1  - Add-on : vorgefertigte Einheiten zur Erweiterung von Geschosswohnungsbauten ; Forschungsprojekt Sommersemester 2007
Y1  - 2007
SN  - 3-9808079-9-1
PB  - Technische Universität Darmstadt
CY  - Darmstadt
ER  - 
TY  - THES
A1  - Trzewik, Jürgen
T1  - Experimental analysis of biaxial mechanical tension in cell monolayers and cultured three-dimensional tissues: the celldrum technology
Y1  - 2007
N1  - Zugl.: Ilmenau, Techn. Univ., Diss., 2007
PB  - Univeristätsverlg Ilmenau
CY  - Ilmenau
ER  - 
TY  - CHAP
A1  - Drumm, Christian
A1  - Lemcke, Jens
A1  - Oberle, Daniel
T1  - Business Process Management And Semantic Technologies
T2  - The Semantic Web
Y1  - 2007
SN  - 978-0-387-48531-7
U6  - https://doi.org/10.1007/978-0-387-48531-7_10
SP  - 207
EP  - 239
PB  - Springer
CY  - Boston, MA
ER  - 
TY  - CHAP
A1  - Weber, Ingo
A1  - Markovic, Ivan
A1  - Drumm, Christian
T1  - A conceptual framework for composition in business process management
T2  - Business Information Systems : 10th International Conference, BIS 2007, Poznan, Poland, April 25-27, 2007. Proceedings
Y1  - 2007
SN  - 978-3-540-72035-5
U6  - https://doi.org/10.1007/978-3-540-72035-5_5
SP  - 54
EP  - 66
PB  - Springer
CY  - Berlin, Heidelberg
ER  -