Background: Spent caustic contains noxious components such as sulfide species and also high chemical oxygen demand content (COD). Oxidation of these materials to caustic and sulfate species is mostly the rate-controlling step within catalytic oxidation of spent caustic. Methods: In this study, the kinetics of catalytic oxidation of spent caustic and the regeneration methodology of the sulfidic...

. The objective of STEP is to provide a neutral data model capable of describing product data throughout the life cycle of a product that is independent from any particular software application or computer platform. AP203, AP214, AP224 promote the integration of CAD/CAM system. Now STEP-NC, a new extension of STEP, is being developed. A truly integrated CAD, CAPP, CAM and CNC paradigm is now in...

Chemical-looping water splitting is a novel and promising technology for hydrogen production with CO2 separation. Its efficiency and performance depend critically on the reduction and oxidation (redox) properties of the oxygen carriers (OC). Ceria is recognized as one of the most promising OC candidates, because of its fast chemistry, high ionic diffusivity, and large oxygen storage capacity. T...

The present study deals with the decolorization of CI Acid Red SR (ARAN as a model contaminant from textileindustry using sawdust as an adsorbent. The effects of initial AR88 concentration, adsorbent dosage, pH. c not acttime and ',riming rah: wcrg studied in a batch mode. The variation of pH from 3 to 10 showed no considerablechange in decolorization rate. The desired conditions for decoloriza...

The purpose of this study was to cstablish a numerical computation rnodel for estimation of oxygen uptake (VO.) kinetics in decremental oad cxercisc (DLE) starting from a work rate {WR) above thc vcntilatory thrcshold (>VT). In the model, WR in DLE were separated into scvcrul steps (constant ]oad excrcise, CLE) of which the durations increased stcp by step. VO]. kinetics in each step was estima...

In the present study, the kinetics of biodiesel production through transesterification of Brassica carinata oil with methanol in the presence of Potassium Hydroxide is investigated by kinetic Monte Carlo simulation. The obtained results from simulation agree qualitatively with the existing experimental data. The kinetics data for each step of suggested mechanism are confirmed by simulation. By ...

We studied the step dynamics during crystal sublimation and growth in the limit of fast surface diffusion and slow kinetics of atom attachment-detachment at the steps. For this limit, we formulate a model free of the quasistatic approximation in the calculation of the adatom concentration on the terraces at the crystal surface. Such a model provides a relatively simple way to study the linear s...

background: toxoplasma gondii , an apicomplexan parasite, is capable of infecting a broad range of intermediate warm-blooded hosts including humans. the parasite seems to be capable of altering the natural behavior of the host to favor its trans-mission in the environment. the aim of this study was to evaluate the course, alter-ations in behavior along with normal kinetics of the abnormally ind...

In the present study, a new step-based photoreactor was presented to investigate the degradation of Acid Red 73 under visible light irradiation. Four N-TiO2-coated alumina foams prepared by the modified sol-gel process were arranged in each step as photocatalyst. The experimental design methodology was employed to assess the interaction between the operational parameters in the step-...