Fluid-mediated interaction between catalyst particles alone issho wn to yield severul interesting and significant phenomena in a catalytic reactor that have been generally attributed in the past to direct interaction between particles. Thus, collaborative interaction between particles and the fluid may enhance or abate steady-state multiplicity, and reverse stability behavior. From the simple s...

The problem of explaining the rich spectrum of different patterns exhibited by mammals has a long history. In a controversial paper (1952) Turing proposed a Reaction-Diffusion (RD) model to explain at a macroscopic scale the process of pattern formation, as related to the occurrence of what he called a diffusion-driven instability. A typical Turing system consists of at least two chemical speci...

In thisworkwe investigate a diffusive Gierer–Meinhardt systemwith gene expression time delays in the production of activators and inhibitors, and also a saturation in the activator production, which was proposed by Seirin Lee et al. (2010) [10]. We rigorously consider the basic kinetic dynamics of the Gierer–Meinhardt system with saturation. By using an upper and lower solution method, we show ...

Pattern formation requires the interaction of a self-enhancing component and its long-raning antogonist. If once established maxima are quenched by a second localacting antagonist, three-component systems result that allow the generation of highly dynamic patterns. Either out-of-phase oscillations in groups of cells, traveling waves with a soliton-like behavior or a regular flashing up of signa...

The purpose of this essay is to provide an overview of the dynamics of pattern formation in solidifying systems. The primary focus is dendritic crystallization during the solidiication of a pure melt. A review is given of the classic experiments performed on succinonitrile. The standard model of solidiication is then introduced and the steady state Ivantsov solution is discussed. The use of the...

We define a finite-horizon repeated network formation game with consent, and study the differences induced by different levels of individual rationality. We prove that perfectly rational players will remain unconnected at the equilibrium, while this result does not hold when, following Neyman (1985), players are assumed to behave as finite automata. We define two types of equilibria, namely the...

The boronizing of a tungsten heavy alloy containing Ni and Fe as the major alloying elements were performed in the present study to increase its surface hardening. Pack cementation method was employed as a well-known, successful solid-state process for boronizing. The coating treatment was accomplished at different temperatures of 1000, 1050 and 1100°C for 6 and 9 hours. The formation of tu...

As the basis and preliminary work of future experimental study on PAHs formation under high temperature, theoretical computations on the intramolecular rearrangement reactions of sylvestrene (1-methyl-3-vinylcyclohexene) and 1,4-dimethyl-4-vinylcyclohexene are conducted and reveal that they may be transformed to themselves. The conversion between Dipentene and 2,4-dimethyl-4-vinylcyclohexen...

The effect of ball milling on kinetics of the thermite reaction of 3Fe2O3 + 8Al powder mixture to synthesizeFe3Al-Al2O3 nanocomposite was investigated using differential thermal analysis. A model-free methodwas applied to the non-isothermal differential calorimetry (DSC) data to evaluate the reaction kineticsaccording to the Starink method. The activation energy of the thermit...