The phase diagram of a lattice microemulsion model proposed by Ciach, Høye and Stell [1,2] is studied using mean-field theory and Monte Carlo simulations. Surfactant directional degrees of freedom are summed out exactly before mean-field theory is applied, and the resulting phase diagrams are much improved compared with previous mean-field results. The critical line and tricritical point is loc...

Dr IF Redelinghuys: BChD, MSc(Odont), MChD(Chir.Max.-Fac. Dent), PhD(MFOS), Dip(Odont) (Pret), Maxillo-Facial and Oral Surgeon, Private Practice Prof K-W Bütow: BSc(RAU), BChD, MChD(in MFOSurg)(Stell), DMD(Erlang-Nürnb), PhD, DSc(Pret), FC MFOS(SA), Professor and Head: Department of Maxillo-Facial and Oral Surgery, University of Pretoria. Dr P Carstens: BLC, LLB, LLD(Pret), Professor: Departmen...

The spectral and dynamic properties of cone-driven horizontal cells in carp retina were evaluated with silent substitution stimuli and/or saturating background illumination. The aim of this study was to describe the wiring underlying the spectral sensitivity of these cells. We will present electrophysiological data that indicate that all cone-driven horizontal cell types receive input from all ...

A long-standing problem in the kinetic theory of fluids at moderate and high densities is how to treat the effect of a range of molecular interaction that extends beyond the nearly impenetrable repulsive core that can reasonably be modeled as a hard-sphere core. The most obvious complications in this connection are as follows. First, for high densities, particles are most of the time interactin...

In a series of publications the Cummings-Stell model (CSM), for a binary mixture of associative fluids with steric effects, has been solved analytically using the Percus-Yevick approximation (PYA). The solution consists in a square well potential of width w, whose center is placed into the hard sphere shell (r < σ): at L = σ/n (n = 1, . . . , 4). This paper presents a general solution, for any ...

Certain kinds of two-phase random media, such as suspensions, porous media, and composite materials, are characterized by a discrete particle phase that is distributed throughout a continuous matrix phase (fluid, solid, or void). A fundamental understanding of the effective bulk properties of such systems rest upon knowledge of certain statistical quantities that describe how the phases are spa...