Gerteisen, D., Heilmann, T., Ziegler, C.
A one-dimensional, two-phase, transient PEM fuel cell model including gas diffusion layer, cathode catalyst layer and membrane is developed. The electrode is assumed to consist of a network of...
Experimental and numerical studies of portable PEMFC stack (2009)
Shimpalee, S., Ohashi, M., Zee, J.W. Van, Ziegler, C., Stoeckmann, C., Sadeler, C., ...
The objective of this work is to establish the design principles of a proton exchange membrane (PEM) fuel cell (FC) stack for portable applications. A combination of experiments and numerical...
A dynamic two-phase model of a proton exchange membrane fuel cell with respect to the gas diffusion layer (GDL) is presented and compared with chronoamperometric experiments. Very good agreement...
Paust, N., Krumbholz, S., Munt, S., Müller, C., Koltay, P., Zengerle, R., ...
A microfluidic fuel supply concept for passive and portable direct methanol fuel cells (DMFCs) that operates in all spatial orientations is presented. The concept has been proven by fabricating and...
Schmitteckert, S., Ziegler, C., Doss, M.X., Hescheler, J., Sachinidis, A., Rolletschek, A.
17th Annual Congress of the European Society of Gene and Cell Therapy (ESGCT), 4th Annual Congress of the German Society for Stem Cell Research (GSZ), 16th Annual meeting of the German Society for...
Comparison of gait data using two different protocols for ankle joint kinematics (2008)
Krauss, I, Stacoff, A, Axmann, D, Ziegler, C, Grau, S, Horstmann, T
No abstract available.
Experimental study of two-phase transients in PEMFCs (2008)
Ziegler, C., Heilmann, T., Gerteisen, D.
Measurement techniques for the in situ investigation of two-phase transients in polymer-electrolyte membrane fuel cells (PEMFCs) are presented. Fundamental concepts from system theory, voltammetry,...
A nonisothermal PEM fuel cell model including two water transport mechanisms in the membrane (2008)
Steinkamp, K., Schumacher, J.O., Goldsmith, F., Ohlberger, M., Ziegler, C.
A dynamic two-phase flow model for proton exchange membrane fuel cells is presented. The two-dimensional model includes the two-phase flow of water (gaseous and liquid) in the gas diffusion layers...
Enhancing liquid water transport by laser perforation of a GDL in a PEM fuel cell (2008)
Gerteisen, D., Heilmann, T., Ziegler, C.
The presence of liquid water in a polymer electrolyte membrane fuel cell hinders gas diffusion to the active sites, which results in large concentration overpotentials and instability of the fuel...
A one-dimensional two-phase model is developed to study the dynamic water transport in the porous layers of polymer electrolyte membrane (PEM) fuel cells. Liquid water transport and diffusion of...
Center for Scientific Computation And Mathematical Modeling (2007)
K. Kühn, M. Ohlberger, J. O. Schumacher, C. Ziegler, R. Klöfkorn, Karsten Kühn Ab, ...
A dynamic two-phase flow model of proton exchange membrane fuel cells
On the reliability of measurements including a reference electrode in DMFCs (2007)
Eccarius, S., Manurung, T., Ziegler, C.
Reference cells are used to distinguish between polarization losses of the anode electrode and the cathode electrode in an electrochemical system. In the case of a direct methanol fuel cell (DMFC), a...
Baur, F., Bemmann, U., Müller, N., Ziegler, C., Fritsche, U.R., Effinger, A., ...
"Within the research project "BioRegio - Strategies for a sustainable energetic utilisation of biomass in chosen model regions", which was funded by the German Federal Environment Ministry, the...
Drilling to gabbro in intact ocean crust (2006)
Wilson, D.S., Teagle, D.A.H., Alt, J.C., Banerjee, N.R., Umino, S., Miyashita, S., ...
Sampling an intact sequence of oceanic crust through lavas, dikes, and gabbros is necessary to advance the understanding of the formation and evolution of crust formed at mid-ocean ridges, but has...
Planar air-breathing fuel cells in printed circuit board technology have been developed as a promising candidate for use in electronic devices. In order to analyze the operational behavior, a...
Yu, H.M., Ziegler, C., Oszcipok, M., Zobel, M., Hebling, C.
The catalyst layer is one of the key components of PEMFCs. As the electrochemical reaction occurs at the three-phase interface of the catalyst layer, it is necessary to investigate the hydrophobicity...
Transient behavior of a proton exchange membrane fuel cell under dry operation (2006)
The transient behavior of a polymer exchange membrane fuel cell (PEMFC) with dry gases fed in is investigated in this paper. Periodical ramp sweeps were applied to the fuel cell. When dry gases are...
Two-phase dynamic modeling of PEMFCs and simulation of cyclo-voltammograms (2005)
Ziegler, C., Yu, H.M., Schumacher, J.O.
A mathematical model is developed that is based on a coupled system of partial differential equations. The model contains a dynamic and two-phase description of the proton exchange membrane fuel cell...
Modeling planar and self-breathing fuel cells for use in electronic devices (2004)
Ziegler, C., Schmitz, A., Tranitz, M., Fontes, E., Schumacher, J.O.
A theoretical study of a planar and self-breathing fuel cell is presented. This work contains the development of a mathematical model for planar self-breathing fuel cells, the validation of the...
Modelling approach for planar self-breathing PEMFC and comparison with experimental results (2004)
Schmitz, A., Ziegler, C., Schumacher, J.O., Tranitz, M., Fontes, E., Hebling, C.
Modelling of planar self-breathing PEMFC (2003)
Schmitz, A., Ziegler, C., Schumacher, J.O., Tranitz, M., Fontes, E., Hebling, C.
A dynamic two-phase flow model of proton exchange membrane fuel cells (2003)
Kühn, K., Ohlberger, M., Schumacher, J.O., Ziegler, C., Klöfkorn, R.
Research on Adaptive Delta Modulators. (2002)
Dhadesugoor,V. R., Ziegler,C., Schilling,D. L.
In this report, the performance of the Song Mode Voice Adaptive Delta Modulator (SVADM) and the Continuously Variable Slope Delta MODULATOR (CVSD) are compared in terms of dynamic range, sampling...
Research on Adaptive Delta Modulators. (2002)
Dhadesugoor,V. R., Ziegler,C., Schilling,D. L., Dressler,M., Davidovici,S.
This report summarizes our results of Voice encoding and video encoding using adaptive delta modulation. Topics include: packet loss, algorithm adaptation, variable rate algorithms, silence detection...
Jet production in polatized lepton-hadron scattering (2001)
Abstract: We calculate exact analytical expressions for O(alpha s) 3-jet and O (alpha^2 s ) 4-jet cross sections in polarized deep inelastic lepton nucleon scattering. Introducing an invariant jet...
Riesch-Oppermann, H., Brückner-Foit, A., Ziegler, C.
ECF 13 : The 13th European Conf.on Fracture ; Fracture Mechanics: Applications and Challenges, San Sebastian, E, September 6-9, 2000
RADIOISOTOPE TAXI GUIDANCE SYSTEM PHASE I. FEASIBILITY STUDY. (1998)
Sellers, B., Hunerwadel, J., Ziegler, C.
Methods utilizing radioisotopes as an integral part of an all weather, zero visibility, ground guidance system have been evaluated. The most promising technique has been selected and examined in...
Fragmentation cross sections of relativistic ^{208}Pb projectiles (1998)
Jong, M. De, Schmidt, K-H., Blank, B., Boeckstiegel, C., Brohm, T., Clerc, H-G., ...
Fragmentation cross sections of relativistic ^{208}Pb projectiles (1998)
Jong, M. De, Schmidt, K-H., Blank, B., Boeckstiegel, C., Brohm, T., Clerc, H-G., ...
Blau, A., Ziegler, C., Heyer, M., Endres, F., Schwitzgebel, G., Matthies, T., ...
Revealing the complex signal-processing mechanisms and interconnection patterns of the nervous system has long been an intriguing puzzle. As contribution to its understanding the optimization of the...
Constraint (Logic) Programming: A Bibliography (1996)
Michael Jampel, Jean-louis Lassez, Vijay Saraswat, C. Ziegler, M. Surauer
ion for unstructured CSPs. In SARA'92: Proceedings of the Symposium on Abstraction, Reformulation, and Approximation, pages 126--133, 1992. http://www.cs.utexas.edu/users/schrag/SARA.ps. [733]...
Clerc, H.G., Jong, M. De, Brohm, T., Dornik, M., Grewe, A., Hanelt, E., ...
Clerc, H.G., Jong, M. De, Brohm, T., Dornik, M., Grewe, A., Hanelt, E., ...
Jet Production in Polarized Lepton-Hadron Scattering (1994)
We calculate exact analytical expressions for \oas 3-jet and \oasz \\ 4-jet cross sections in polarized deep inelastic lepton nucleon scattering. Introducing an invariant jet definition scheme, we...
First observation of the beta-delayed proton decay of $^{52}$Ni (1994)
Faux, L., Pravikoff, M.S., Andriamonje, S., Blank, B., Del Moral, R., Dufour, J.P., ...
First observation of the beta-delayed proton decay of $^{52}$Ni (1994)
Faux, L., Pravikoff, M.S., Andriamonje, S., Blank, B., Del Moral, R., Dufour, J.P., ...
Fragmentation of exotic nuclei in the mass region 46<=a<=77 (1992)
Brohm, T., Clerc, H.G., Dornik, M., Fauerbach, M., Grewe, A., Hanelt, E., ...
Fragmentation of exotic nuclei in the mass region 46<=a<=77 (1992)
Brohm, T., Clerc, H.G., Dornik, M., Fauerbach, M., Grewe, A., Hanelt, E., ...
Stary, A, Soeltz-Szoets, J, Ziegler, C, Kinghorn, G R, Roy, R B
One hundred fifty seven men with candidal balanitis were entered in a randomised, open-label parallel-group multicentre study comparing efficacy and safety of a single oral 150-mg fluconazole-dose...