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534 results on '"Bessler, W."'

2. Rate-dependent morphology of Li2O2 growth in Li-O2 batteries

Author

Horstmann, B., Gallant, B., Mitchell, R., Bessler, W. G., Shao-Horn, Y., and Bazant, M. Z.

Subjects
Physics - Chemical Physics, Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science
Abstract

Compact solid discharge products enable energy storage devices with high gravimetric and volumetric energy densities, but solid deposits on active surfaces can disturb charge transport and induce mechanical stress. In this Letter we develop a nanoscale continuum model for the growth of Li2O2 crystals in lithium-oxygen batteries with organic electrolytes, based on a theory of electrochemical non-equilibrium thermodynamics originally applied to Li-ion batteries. As in the case of lithium insertion in phase-separating LiFePO4 nanoparticles, the theory predicts a transition from complex to uniform morphologies of Li2O2 with increasing current. Discrete particle growth at low discharge rates becomes suppressed at high rates, resulting in a film of electronically insulating Li2O2 that limits cell performance. We predict that the transition between these surface growth modes occurs at current densities close to the exchange current density of the cathode reaction, consistent with experimental observations., Comment: 8 pages, 6 figs

Published
2013

23. Szintigraphische Untersuchungen von Knochen und Gelenken

Author

Bessler, W., Diethelm, L., editor, Heuck, F., editor, Olsson, O., editor, Strnad, F., editor, Vieten, H., editor, Zuppinger, A., editor, Anger, K., Becker, D. V., Bessler, W., Bischof-Delaloye, A., Börner, W., Churchod, A., Delaloye, B., Emde, H., Feine, U., Finck, W., Friedrich, M., Fritzsche, H., Gray, H. W., Greig, W. R., Hennig, K., Höfer, R., Hör, G., Hundeshagen, H., Krönert, E., Mariß, P., Montz, R., Pabst, H. W., Ramos, M., Ritzl, F., Rösler, H., zum Winkel, K., Wolf, F., Woller, P., Zeidler, U., Zeitler, E., and Zita, G.

Published
1978
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29. Klinische Immunologie

Author

Lindenborn-Fotinos, J., Berg, P. A., Trautmann, F., Manns, M., Meyer zum Büschenfelde, K.-H., Eckstein, R., Bolte, H. D., Heim, M. U., Lehmeier, A., Wilmanns, W., Mempel, W., Maisch, B., Koper, D., Sibelis, Th., Kochsiek, K., Goebel, H., Arnold, W., Bohl, J., Stoltenburg-Didinger, G., Plagwitz, R., Rauterberg, E. W., Carls, C., Lieberknecht, M., Held, H., Lüdemann, J., Brade, H., Bessler, W., Gross, W. L., van de Venn, D., Sieg, I., Betz, M., Hänsch, G. M., Lohmeyer, J., Hadam, M., Förster, W., Santoso, S., Pralle, H., Miehlke, Klaus, editor, and Bergmann, J. F.

Published
1984
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32. Why Does Mutual Fund Performance Not Persist? The impact and interaction of fund flows and manager changes

Author

Bessler, W., Blake, D., Lückoff, P., and Tonks, I.

Subjects
HG
Abstract

We explain the lack of long-term performance persistence by actively managed U.S. equitymutual funds in terms of two equilibrating mechanisms: fund flows and manager changes. Wefind that these mechanisms acting together affect the future performance of past outperforming(winner) funds and past underperforming (loser) funds. Fund flows in isolation have a significanteffect on performance, whereas manager changes in isolation have only a limited effect. Acombination of both fund flows and manager changes has a substantial impact on future fundperformance. If neither of these equilibrating mechanisms is operating, winner funds continue to significantly outperform loser funds by 4.08 percentage points per annum. However, the difference between winner and loser funds declines to almost zero if the two mechanisms are acting together. We also document that managers of winner funds increase risk, while managers of loser funds reduce risk, although losers who are fired took more risk than losers who keep theirjobs.

Published
2014

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