this paper investigates the importance of considering biomass growth and decay for predicting a field scale microbial degradation of btex plume in an unconfined aquifer system in the pump station area of tehran oil refinery (tor), iran. a two-dimensional finite volume model has been presented to predict multi-species reactive transport incorporating physical, chemical and biological processes i...

Virtually every soil "lives" in that all of its properties undergo changes with time some insignificant, but others very important. Time-dependent chemical, geomicrobiological, and mechanical processes may result in compositional and structural changes that lead to softening, stiffening, strength loss, strength gain, or altered conductivity properties. The need to predict what the properties an...

We show how to achieve large-amplitude oscillation and good frequency stability in a nonlinear NEMS oscillator by using a softening nonlinearity to locally balance the hardening behaviour of the Duffing nonlinearity for a given motion amplitude. The case when the softening behaviour is obtained via electrostatic biasing is theoretically investigated, under parallel-plate assumptions, for a full...

Abstract The chemical composition, structural and plastometric properties of different-ranked coals from Mongolia deposits were studied. non-isothermal iso-conversion Ozawa–Flynn–Wall Friedman model-free methods used to assess kinetic parameters differentiate decomposition steps. Key peculiarities the pyrolysis kinetics brown bituminous revealed discussed in terms composition properties. Brown ...