TY - JOUR
AU - Würtz, A.
AU - Deviatov, E.V.
AU - Lorke, A.
AU - Dolgopolov, V.T.
AU - Reuter, Dirk
AU - Wieck, A.D.
ID - 8703
JF - Physica E: Low-dimensional Systems and Nanostructures
SN - 1386-9477
TI - Separately contacted edge states in the fractional quantum Hall regime
ER -
TY - JOUR
AU - Deviatov, E. V.
AU - Würtz, A.
AU - Lorke, A.
AU - Yu. Melnikov, M.
AU - Dolgopolov, V. T.
AU - Reuter, Dirk
AU - Wieck, A. D.
ID - 8710
JF - Physical Review B
SN - 1098-0121
TI - Two relaxation mechanisms observed in transport between spin-split edge states at high imbalance
ER -
TY - CONF
AU - Schattkowsky, Tim
AU - Rettberg, Achim
ID - 8392
T2 - Proceedings of the International Workshop on UML for SoC Design (UML-SOC 2004), San Diego, CA (USA)
TI - UML for FPGA Synthesis
ER -
TY - CONF
AU - Frank, Christian
AU - Karl, Holger
ID - 854
T2 - Proceedings of the 7th International Symposium on Modeling Analysis and Simulation of Wireless and Mobile Systems, MSWiM 2004, Venice, Italy, October 4-6, 2004
TI - Consistency challenges of service discovery in mobile ad hoc networks
ER -
TY - GEN
ED - Karl, Holger
ED - Willig, Andreas
ED - Wolisz, Adam
ID - 859
SN - 3-540-20825-9
TI - Wireless Sensor Networks
ER -
TY - JOUR
AU - Langbein, W.
AU - Borri, P.
AU - Woggon, U.
AU - Schwab, M.
AU - Bayer, M.
AU - Fafard, S.
AU - Wasilewski, Z.
AU - Hawrylak, P.
AU - Stavarache, V.
AU - Reuter, Dirk
AU - Wieck, A.D.
ID - 8676
JF - Physica E: Low-dimensional Systems and Nanostructures
SN - 1386-9477
TI - Coherent dynamics in InGaAs quantum dots and quantum dot molecules
ER -
TY - CONF
AB - During operation, the rotating blades of a gas turbine are subjected to centrifugal forces as well as fluctuating gas forces, resulting in blade vibrations. In addition to material damping, aerodynamical and blade root damping, underplatform dampers are widely used to increase the amount of damping and to decrease blade vibration amplitudes. The friction forces generated by the relative displacements between the underplatform damper and the blade platforms provide a significant amount of energy dissipation. In practice, a number of different underplatform damper designs are applied. Basically, these are wedge dampers with flat contact areas, cylindrical dampers with curved surfaces or asymmetrical dampers with both flat contact surfaces on one side and curved contact surfaces on the other. The latter damper type combines the advantages of both the wedge and the cylindrical damper by preventing the damper from pure rolling on the one hand as it has been observed for cylindrical dampers and on the other hand, avoiding a diverged plane area contact in case of a wedge damper, causing a damper lift-off. This paper will focus on the investigation of cylindrical and asymmetrical underplatform dampers. A comparison between measurements of rotating assemblies in Siemens PG gas turbines (V84.2, V64.3A and V94.3A(2)) under test and real operating conditions with cylindrical and asymmetrical underplatform dampers and the predictions of the developed theoretical model are presented. Special attention is paid to the frequency shift due to the application of an underplatform damper, since in particular for stationary gas turbines, in addition to the amplitude reduction, the accurate prediction of the resonance frequency is of major interest. Copyright {\copyright} 2004 by ASME
AU - Panning, Lars
AU - Popp, Karl
AU - Sextro, Walter
AU - Götting, Florian
ID - 9523
IS - GT2004-53316
KW - Dampers
KW - Gas turbines
T2 - Proceedings of ASME TURBO Expo, Power for Land, Sea, and Air
TI - Asymmetrical Underplatform Dampers in Gas Turbine Bladings: Theory and Application
VL - 6
ER -
TY - JOUR
AU - Klimin, Nikolay
AU - Enkelmann, Wilfried
AU - Karl, Holger
AU - Wolisz, Adam
ID - 993
JF - Proc. of WIT
TI - A hybrid approach for location-based service discovery in vehicular ad hoc networks
ER -
TY - JOUR
AU - Mengesha, Seble
AU - Karl, Holger
AU - Wolisz, Adam
ID - 998
JF - Proc. of MedHocNet 2004
TI - Capacity increase of multi-hop cellular wlans exploiting data rate adaptation and frequency recycling
ER -
TY - CONF
AU - Brinkmann, André
AU - Heidebuer, Michael
AU - Meyer auf der Heide, Friedhelm
AU - Rückert, Ulrich
AU - Salzwedel, Kay
AU - Vodisek, Mario
ED - Kobler, Ben
ED - Hariharan, P. C.
ID - 17346
T2 - 21st {IEEE} Conference on Mass Storage Systems and Technologies / 12th {NASA} Goddard Conference on Mass Storage Systems and Technologies, Greenbelt, Maryland, USA
TI - V:Drive - Costs and Benefits of an Out-of-Band Storage Virtualization System
ER -
TY - CHAP
AU - Peckhaus, Volker
ED - Christiansen, Bente
ED - Scheffler, Uwe
ID - 17548
T2 - Was folgt? Themen zu Wessel
TI - Garantiert Widerspruchsfreiheit Existenz?
ER -
TY - GEN
AU - Peckhaus, Volker
ED - Hoffmann, Dieter
ED - Laitko, Hubert
ED - Müller-Wille, Staffan
ID - 17682
T2 - Lexikon der bedeutenden Naturwissenschaftler in drei Bänden, Bd. 3: Men–Z
TI - van der Waerden, Bartel Leendert
ER -
TY - GEN
AU - Peckhaus, Volker
ID - 17795
IS - (2003)
T2 - History and Philosophy of Logic
TI - Rudolf Boehm, Topik, Dordrecht, Boston and London: Kluwer, 2002 (Phaenomenologica vol. 162)
VL - 25
ER -
TY - BOOK
AB - Rezensionen: History and Philosophy of Logic 27 (2006), 198–200 (Dirk Schlimm); Bulletin of Symbolic Logic 12 (2006), 137–139 (R. Vilkko); NTM 15 (2007), 67–68 (K. Radbruch); Philosophiques 35 (2008), 612–613 (Y. Gauthier).
ED - Peckhaus, Volker
ID - 17459
SN - 3-7705-4126-X
TI - Oskar Becker und die Philosophie der Mathematik
ER -
TY - CHAP
AB - Rezension: Journal of the History of Philosophy 43.3 (2005), 367–369 (H.J. Cloeren).
AU - Peckhaus, Volker
ED - Bernays, Ludwig
ID - 17550
T2 - Otto Friedrich Gruppe 1804–1876. Philosoph, Dichter, Philologe
TI - Otto Friedrich Gruppe und die Logische Frage
VL - 3
ER -
TY - CONF
AB - For $c in REAL$, a $c$-spanner is a subgraph of a complete Euclidean graph satisfying that between any two vertices there exists a path of weighted length at most $c$ times their geometric distance. Based on this property to approximate a complete weighted graph, sparse spanners have found many applications, e.g., in FPTAS, geometric searching, and radio networks. For geometric searching, it turned out to suffice whether the radius rather than the length of some path between any two vertices is bounded relatively to their geometric distance; this is the defining property of weak spanners. Finally regarding radio network applications, a power spanner accounts for the total energy afforded for a wireless transmission with the requirement that the sum of the squares of the lengths of some path between any two planar vertices must be bounded relatively to the square of their geometric distance (or higher powers up to 6 or even 8).

While it is known that any $c$-spanner is also both a weak $C_1$-spanner and a $C_2$-power spanner (for appropriate $C_1,C_2$ depending only on $c$ but not on the graph under consideration), we show that the converse fails: There exists a family of $c_1$-power spanners that are no weak $C$-spanners and also a family of weak $c_2$-spanners that are no $C$-spanners for any fixed $C$ (and thus no uniform spanners, either). However the deepest result of the present work reveals that, surprisingly, any weak spanner is also a uniform power spanner. We further generalize the latter notion by considering $(c,delta)$-power spanners where the sum of the $delta$-th powers of the lengths has to be bounded; so $(cdot,2)$-power spanners coincide with the usual power spanners and $(cdot,1)$-power spanners are classical spanners. Interestingly, these $(cdot,delta)$-power spanners form a strict hierarchy where the above results still hold for any $deltageq2$; some even hold for $delta>1$ while counterexamples reveal others to fail for $delta<2$. In fact we show that in general every self-similar curve of fractal dimension $d>delta$ is no $(C,delta)$-power spanner for any fixed $C$.
AU - Schindelhauer, Christian
AU - Volbert, Klaus
AU - Ziegler, Martin
ID - 18279
SN - 0302-9743
T2 - Proc. of 15th Annual International Symposium on Algorithms and Computation (ISAAC'04)
TI - Spanners, Weak Spanners, and Power Spanners for Wireless Networks
VL - 3341
ER -
TY - JOUR
AU - Tophinke, Doris
ID - 18281
JF - Infodienst. Kulturpädagogische Nachrichten
TI - Quatschwörterverse und Satzklötze. Sprachförderung im Kindergarten
VL - 71
ER -
TY - GEN
AU - Peckhaus, Volker
ID - 18495
T2 - Zentralblatt für Mathematik und ihre Grenzgebiete [Zbl. 1033.03002]
TI - Newen, Albert/Nortmann, Ulrich/Stuhlmann-Laeisz, Rainer (Hgg.), Building on Frege. New Essays on Sense, Content, and Concept, CSLI Publications: Standford, CA 2001
ER -
TY - GEN
AU - Peckhaus, Volker
ID - 18488
T2 - Zentralblatt für Mathematik und ihre Grenzgebiete [Zbl. 1030.01030]
TI - Takeuti, Gaisi, Memoirs of a Proof Theorist. Gödel and other Logicians, ed. Mariko Yasugi/Nicholas Passell, World Scientific: New Jersey u.a. 2003
ER -
TY - GEN
AU - Peckhaus, Volker
ID - 18483
T2 - Zentralblatt für Mathematik und ihre Grenzgebiete [Zbl. 1026.03006]
TI - Tomassi, Paul, “Logic after Wittgenstein,” Nordic Journal of Philosophical Logic 6 (2001), 43–70
ER -