1,720,975 research outputs found
Detection and removal of unfeasible solutions in kinetic models described by differential algebraic equations
No full text
Two -dimensional Structures in Polymerized Monomolecular Films. Thin Solid Films, 210/211, 412-415 (1992).
No full textUsing non-equilibrium biosorption column modelling for improved process efficiency
No full textAn unsteady-state biosorption column model in one space variable is considered in this paper. The theoretical study is motivated by the need for predicting the dependent variables of biosorption columns for removal of heavy metals from wastewater, which is potentially an important technology in cleaner production. Pollutant concentrations in the bulk phase, in the liquid filling the pores and in the solid
biomass along the axial coordinate of the column were evaluated for a wide range of physical and chemical parameters of the global process. In particular, the assumption of instantaneous chemical reactions is replaced by a more realistic expression taking into account chemical kinetics and fluid advection time scales separately. The resulting system of partial differential equations was solved by
means of a reliable numerical algorithm based on the method of lines. The data obtained using the model described in this paper are compared with published experimental data and an estimation of the increased efficiency is made
Montecarlo simulation of a ballistic selective etching process in (2+1) dimensions
No full textIn this paper, we propose a surface disaggregation model in (2+1) dimensions with biased motion of the eroding particle. The deconstruction is subject to selection criteria depending on the local coordination number of the extracted surface site. The surface width is investigated at early times and in saturation, showing an agreement with the Edwards Wilkinson theory. We argue that site selection criteria in etching effects on surface statistics similar to local relaxations rules in growth processes. The results are related to the recent discussions on topological effects in molecular beam epitax
- …
