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313 results (View BibTeX file of all listed publications)

2004

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General relations between many-body potentials and cluster expansions in multi-component systems

Drautz, R., Fähnle, M., Sanchez, J.M.

{Journal of Physics: Condensed Matter}, 16, pages: 3843-3852, 2004 (article)

mms

[BibTex]

2004

mms Drautz, R., Fähnle, M., Sanchez, J.M. General relations between many-body potentials and cluster expansions in multi-component systems {Journal of Physics: Condensed Matter}, 16, pages: 3843-3852, 2004 (article)

[BibTex]

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Counting individual atom layers in graphite - high-resolution RBS experiments on HOPG (highly ordered pyrolytic graphite)

Srivastava, S. K., Plachke, D., Szökefalvi-Nagy, A., Major, J., Carstanjen, H. D.

{Nuclear Instruments and Methods B}, 219-220, pages: 364-368, 2004 (article)

Abstract
{The paper reports about recent experiments on HOPG (highly oriented pyrolytic graphite) by high-resolution RBS (Rutherford backscattering spectroscopy). By using an ion beam of 1 MeV N+ up to 7 individual monolayers could be identified in the RBS spectrum from such a sample. This is about twice as much as observed by other groups up to now. Since close to the surface the RBS peaks from the individual carbon layers are well separated, various quantities important for the ion-solid interaction can be determined with high precision, such as the stopping power of 1 MeV N ions in graphite and their energy straggling. Close to the surface the RBS peaks are asymmetric which is well explained in the framework of the Landau theory of energy straggling.}

mms

[BibTex]

mms Srivastava, S. K., Plachke, D., Szökefalvi-Nagy, A., Major, J., Carstanjen, H. D. Counting individual atom layers in graphite - high-resolution RBS experiments on HOPG (highly ordered pyrolytic graphite) {Nuclear Instruments and Methods B}, 219-220, pages: 364-368, 2004 (article)

[BibTex]

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Feedback error learning and nonlinear adaptive control

Nakanishi, J., Schaal, S.

Neural Networks, 17(10):1453-1465, 2004, clmc (article)

Abstract
In this paper, we present our theoretical investigations of the technique of feedback error learning (FEL) from the viewpoint of adaptive control. We first discuss the relationship between FEL and nonlinear adaptive control with adaptive feedback linearization, and show that FEL can be interpreted as a form of nonlinear adaptive control. Second, we present a Lyapunov analysis suggesting that the condition of strictly positive realness (SPR) associated with the tracking error dynamics is a sufficient condition for asymptotic stability of the closed-loop dynamics. Specifically, for a class of second order SISO systems, we show that this condition reduces to KD^2 > KP; where KP and KD are positive position and velocity feedback gains, respectively. Moreover, we provide a ÔpassivityÕ-based stability analysis which suggests that SPR of the tracking error dynamics is a necessary and sufficient condition for asymptotic hyperstability. Thus, the condition KD^2>KP mentioned above is not only a sufficient but also necessary condition to guarantee asymptotic hyperstability of FEL, i.e. the tracking error is bounded and asymptotically converges to zero. As a further point, we explore the adaptive control and FEL framework for feedforward control formulations, and derive an additional sufficient condition for asymptotic stability in the sense of Lyapunov. Finally, we present numerical simulations to illustrate the stability properties of FEL obtained from our mathematical analysis.

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link (url) [BibTex]

am Nakanishi, J., Schaal, S. Feedback error learning and nonlinear adaptive control Neural Networks, 17(10):1453-1465, 2004, clmc (article)

link (url) [BibTex]

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Micromagnetism and the microstructure of high-temperature permanent magnets

Goll, D., Kronmüller, H., Stadelmaier, H. H.

{Journal of Applied Physics}, 96(11):6534-6545, 2004 (article)

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[BibTex]

mms Goll, D., Kronmüller, H., Stadelmaier, H. H. Micromagnetism and the microstructure of high-temperature permanent magnets {Journal of Applied Physics}, 96(11):6534-6545, 2004 (article)

[BibTex]

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Atomic defects and diffusion in intermetallic compounds with DO3 structure: An ab-initio study

Fähnle, M., Schimmele, L.

{Zeitschrift f\"ur Metallkunde}, 95, pages: 864-869, 2004 (article)

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[BibTex]

mms Fähnle, M., Schimmele, L. Atomic defects and diffusion in intermetallic compounds with DO3 structure: An ab-initio study {Zeitschrift f\"ur Metallkunde}, 95, pages: 864-869, 2004 (article)

[BibTex]

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Cluster surface interactions: Small Fe clusters driven nonmagnetic on graphite

Fauth, K., Gold, S., He\ssler, M., Schütz, G.

{Chemical Physics Letters}, 392(4-6):498-502, 2004 (article)

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DOI [BibTex]

mms Fauth, K., Gold, S., He\ssler, M., Schütz, G. Cluster surface interactions: Small Fe clusters driven nonmagnetic on graphite {Chemical Physics Letters}, 392(4-6):498-502, 2004 (article)

DOI [BibTex]

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\textquotesingleWetting by solid state’grain boundary phase transition in Zn-Al alloys

Straumal, B. B., Khruzhcheva, A. S., Lopez, G. A.

{Reviews on Advanced Materials Science}, 7(1):13-22, 2004 (article)

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[BibTex]

mms Straumal, B. B., Khruzhcheva, A. S., Lopez, G. A. \textquotesingleWetting by solid state’grain boundary phase transition in Zn-Al alloys {Reviews on Advanced Materials Science}, 7(1):13-22, 2004 (article)

[BibTex]

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Two prototypes of metal adatom configurations on Mo(112): an ab initio study for Li and Co

Singer, R., Drautz, R., Fähnle, M.

{Surface Science}, 559, pages: 241-248, 2004 (article)

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[BibTex]

mms Singer, R., Drautz, R., Fähnle, M. Two prototypes of metal adatom configurations on Mo(112): an ab initio study for Li and Co {Surface Science}, 559, pages: 241-248, 2004 (article)

[BibTex]

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Grain boundary phase transitions and their influence on properties of polycrystals

Straumal, B., Baretzky, B.

{Interface Science}, 12(2-3):147-155, 2004 (article)

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[BibTex]

mms Straumal, B., Baretzky, B. Grain boundary phase transitions and their influence on properties of polycrystals {Interface Science}, 12(2-3):147-155, 2004 (article)

[BibTex]

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Swift heavy ion induced modification of Si/C60 multilayers

Srivastava, S. K., Kabiraj, D., Schattat, B., Carstanjen, H. D., Avasthi, D. K.

{Nuclear Instruments and Methods in Physics Research B}, 219 - 220, pages: 815-819, 2004 (article)

mms

[BibTex]

mms Srivastava, S. K., Kabiraj, D., Schattat, B., Carstanjen, H. D., Avasthi, D. K. Swift heavy ion induced modification of Si/C60 multilayers {Nuclear Instruments and Methods in Physics Research B}, 219 - 220, pages: 815-819, 2004 (article)

[BibTex]

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Static displacements of Pd in the solid solution PdBy (0\textlessy\textless0.2) as determined by neutron diffraction

Berger, T. G., Leineweber, A., Mittemeijer, E. J., Fischer, P.

{Physica Status Solidi (A)}, 201, pages: 1484-1492, 2004 (article)

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[BibTex]

mms Berger, T. G., Leineweber, A., Mittemeijer, E. J., Fischer, P. Static displacements of Pd in the solid solution PdBy (0\textlessy\textless0.2) as determined by neutron diffraction {Physica Status Solidi (A)}, 201, pages: 1484-1492, 2004 (article)

[BibTex]

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X-MCD magnetometry of CMR perovskites La0.67-yREyCa0.33MnO3

Sikora, M., Kapusta, C., Zajac, D., Tokarz, W., Oates, C. J., Borowiec, M., Rybicki, D., Goering, E. J., Fischer, P., Schütz, G., De Teresa, J. M., Ibarra, M. R.

{Journal of Magnetism and Magnetic Materials}, 272-276, pages: 2148-2150, 2004 (article)

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[BibTex]

mms Sikora, M., Kapusta, C., Zajac, D., Tokarz, W., Oates, C. J., Borowiec, M., Rybicki, D., Goering, E. J., Fischer, P., Schütz, G., De Teresa, J. M., Ibarra, M. R. X-MCD magnetometry of CMR perovskites La0.67-yREyCa0.33MnO3 {Journal of Magnetism and Magnetic Materials}, 272-276, pages: 2148-2150, 2004 (article)

[BibTex]

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Critical thicknesses of domain formations in cubic particles and thin films

Kronmüller, H., Goll, D., Hertel, R., Schütz, G.

{Physica B}, 343(1-4):229-235, 2004 (article)

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[BibTex]

mms Kronmüller, H., Goll, D., Hertel, R., Schütz, G. Critical thicknesses of domain formations in cubic particles and thin films {Physica B}, 343(1-4):229-235, 2004 (article)

[BibTex]