The dependency of the Nernst potential in an operating proton exchange membrane fuel cell (PEMFC) on temperature, inlet pressure and relative humidity (RH) is examined, highlighting synergistic dependence measured open circuit (OCP) all three parameters. An alternative model equation derived to more appropriately represent PEMFC system where reactant concentration instead considered as activity...

Mixture of flexible polyions with 120 monomer units, equivalent number of oppositely charged counterions and solvent molecules, represented by hard spheres with four square-well off-center sites, was studied by an extension of the product-reactant Ornstein–Zernike theory. Polyions were represented as freely jointed chains of charged hard spheres, and all the species were embedded in continuous ...

Changes in the molecular topology of glycan/lectin interaction may explain observed reaction punctuation driven by experimental gradients in reactant concentration. Adoption of a ‘biological renormalization’ perspective from statistical physics for the analysis of such phase transitions suggests, in marked contrast to conventional physical systems, a broad spectrum of possible universality clas...

In this study, calcium carbonate crystals were obtained by mixing of calcium chloride and sodium carbonate in the presence of biopolymer, carboxymethyl inulin (CMI). The effect of the feed rate of reactant and the initial [Ca] concentration was investigated. The produced calcium carbonate (CaCO3) crystals were characterized by scanning electron microscopy (SEM), Fourier transform infrared spect...

In this study, a proton exchange membrane fuel cell operating at low temperatures with single channel is modeled. The prepared model has been compared experimental data and its accuracy proved. Using model, the impact of change width on performance height being constant geometry cross-sectional area was investigated. It found that enlargement where reactant contacts diffusion layer provides an ...

mean concentration of 0.63 mmol/L, is a powerful acute phase reactant as it changes dramatically during vascular injury and inflammatory processes5. Albumin acts as a buffering agent for endogenous or exogenous toxic molecules due to its various ligands binding ability4,5. The biochemical mechanisms modifying the amino-terminal region of albumin during ischemia are unclear, but reperfusion afte...

We consider catalytic branching random walk (the reactant) where the state space is a countable Abelean group. The branching is critical binary and the local branching rate is given by a catalytic medium. Here the medium is itself an autonomous (ordinary) branching random walk (the catalyst) – maybe with a different motion law. For persistent catalyst (transient motion) the reactant shows the u...

Consider a countable collection (t) of particles located on a countable group, performing a critical branching random walk where the branching rate of a particle is given by a random medium uctuating both in space and time. Here we study the case where the time{space random medium (t) (called catalyst) is also a critical branching random walk evolving autonomously while the local branching rate...