The advent of satellite data has provided a source of independent information to monitor trends in tropospheric nitrogen dioxide levels. To interpret these trends, one needs to know the sensitivity of the satellite retrieved NO2 column to anthropogenic emissions. We have applied a chemistry transport model to investigate the sensitivity of the modeled NO2 column, sampled at the OMI (Ozone Monit...

this article deals with the issues associated with developing a new design methodology for the nonlinear model-predictive control (mpc) of a chemical plant. a combination of multiple neural networks is selected and used to model a nonlinear multi-input multi-output (mimo) process with time delays.  an optimization procedure for a neural mpc algorithm based on this model is then developed. the p...

Originally, the chemical model of computation has been proposed as a simple and elegant parallel programming paradigm. Data is seen as “molecules” and computation as “chemical reactions”: if some molecules satisfy a predefined reaction condition, they are replaced by the “product” of the reaction. When no reaction is possible, a normal form is reached and the program terminates. In this paper, ...

Chemical Reactions networks are widely studied in a variety of fields, including Systems Biology, Medicine, and Chemical Engineering. Analyzing chemical reaction networks is a widely studied problem going back to Guldberg and Waage in the 19th century. Despite being well-studied, many chemical reaction networks still aren’t very well understood, partly due to the complexity of naturally occurin...

The Propose of this paper is to introduce a new model for crude oil fouling in preheat trains of crude distillation unit. The experimental results of Australian light crude oil with the tube side surface temperatures between 200-260 oC and fluid velocity ranged 0.25 to 0.4m/s were used. The activation energy of chemical reaction depends on the surface temperature has been calcula...

A key feature of many biological distributed systems is that they have the capacity to behave in highly coordinated ways. In the domain of language, such coordination dynamics have been studied within the framework of language games. As yet however, a fundamental understanding that goes beyond the simplest cases is still missing. In this paper, a novel approach is proposed for investigating coo...

We have been interested in the construction of a vesicle-based Protocell Model. We already reported a self-reproducing giant vesicle (GV) system in which GVs grew and divided to daughter GVs with almost the same size if a membrane precursor was added to a dispersion of GVs containing a catalyst [1]. We showed that robust self-reproduction of GVs continued over several generations, as revealed b...

A chemical kinetic model of the elongation dynamics of RNA polymerase along a DNA sequence is introduced. The proposed model governs the discrete movement of the RNA polymerase along a DNA template, with no consideration given to elastic effects. The model’s novel concept is a “look-ahead” feature, in which nucleotides bind reversibly to the DNA prior to being incorporated covalently into the n...

Coupled systems can exhibit an unusual kind of multistability, namely, the coexistence of infinitely many attractors for a given set of parameters. This extreme multistability is demonstrated to occur in coupled chemical model systems with various types of coupling. We show that the appearance of extreme multistability is associated with the emergence of a conserved quantity in the long-term li...