A one dimensional isothermal mathematical modeling of cathode side of a Proton Exchange Membrane (PEM) fuel cell is developed for the water management problem. Water transport is investigated in both cathode Gas Diffusion Layer (GDL) and membrane through solving appropriate equations for fluid flow and mass transport in GDL and water transport within the membrane. The gaseous mixture flowing in...

In this work, the main aspects regarding the permeation of mixtures containing CO2 and permanent gases such as H2 , N2 and CH4 through zeolite membranes have been investigated, focusing on the description of the mass transport mechanisms taking place inside the pores. First, a brief overview about the performance of the main zeolite membranes used in gas separation (e.g. DDR, CHA, AEI, FAU, etc...

References: 1) Husain Aljazzar and Stefan Leue: Debugging of Dependability Models Using Interactive Visualization of Counterexamples, to appear in proceedings of QEST 2008. 2) Husain Aljazzar and Stefan Leue: Directed explicit state-space search in the generation of counterexamples for probabilistic reachability, 2008, submitted for journal publication. 3) Husain Aljazzar and Stefan Leue: Count...

In this study, a steady-state model is developed by combining mechanical, Navier–Stokes, Maxwell–Stefan, and Butler–Volmer equations. This then used to investigate the influences of diffusion layer thickness deformation under specific assembly force on porosity distribution as an indicator fuel cell performance. The HT-PEM (high temperature proton exchange membrane) built using COMSOL Multiphys...

Recent advances and findings reported in the literature show that lattice Boltzmann method can be a viable rather efficient alternative to classical numerical methods modeling multi-species flows. Based on kinetic theory of multicomponent gases, multi-fluid approaches are derived. Each species evolves according specific properties, proper coupling must introduced for diffusivity. In recent year...

Department for Geoand Environmental Sciences, GeobioCenter and Center for Nanoscience, Ludwig-Maximilians-Universität, Theresienstrasse 41, 80333 München, Germany *E-mail: [email protected] URL: www.nanobiomed.de Over the last 15 years, the use of atomic force microscopy (AFM) has spread from the materials science of hard matter to the fields of biology and biomolecular research....

The best stage in a scientist s career is ... when they can still do chemistry in the lab with their own hands. The biggest problem that scientists face is ...—sadly enough—to focus on science. The best advice I have ever been given is ... not to get frustrated over problems but to come up with respective solutions (J. M. J. Fr chet). A good work day begins with ... breakfast with the family, r...

The Mechanization of the Mind: On the Origins of of modelling and scientific explanation, the physics Cognitive Science, Jean-Pierre Dupuy, translated by of dissipative processes, aspects of neurophysiology M.B. DeBevoise, Princeton University Press, 2000, and embryology, and more, all without once trivializ$29.95 / £19.95, 240 pp. ISBN: 0-691-02574-6 ing his subject or falling victim to the us...