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| 1 | Kinetic simulation of oxidative coupling of methane over perovskite catalyst by genetic algorithm:Mechanistic aspects显示文摘The reaction kinetics of oxidative coupling of methane catalyzed by perovskite was studied in a fixed bed flow reactor.At atmospheric pressure,the reactions were carried out at 725,750 and 775 ?C,inlet methane to oxygen ratios of 2 to 4.5 and gas hourly space velocity (GHSV) of 100 min?1.Correlation of the kinetic data has been performed with the proposed mechanisms.The selected equations have been regressed with experimental data accompanied by genetic algorithm (GA) in order to obtain optimized parameters.After investigation the Langmuir-Hinshelwood mechanism was selected as the best mechanism,and Arrhenius and adsorption parameters of this model were obtained by linear regression.In this research the Marquardt algorithm was also used and its results were compared with those of genetic algorithm.It should be noted that the Marquardt algorithm is sensitive to the selection of initial values and there is possibility to trap in a local minimum. | Nastaran Razmi Farooji Ali Vatani Shahrnaz Mokhtari | 2010 | Journal of Natural Gas Chemistry2010，19，4： | 3 |
| 2 | Comparative study of kinetic modeling for the oxidative coupling of methane by genetic and marquardt algorithms显示文摘Overall kinetic studies on the oxidative coupling of methane,OCM,have been conducted in a tubular fixed bed reactor,using perovskite titanate as the reaction catalyst.The appropriate operating conditions were found to be:temperature 750-775 ℃,total feed flow rate of 160 ml/min,CH4 /O2 ratio of 2 and GHSV of 100·min-1 .Under these conditions,C 2 yield of 28% was achieved.Correlations of the kinetic data have been performed with lumped rate equations for C2 and COx formation as functions of temperature,O2 and CH4 partial pressures.Six models have been selected among the common lumped kinetic models.The selected models have been regressed with the experimental data which were obtained from the Catatest system by genetic algorithm in order to obtain optimized parameters.The kinetic coefficients in the overall reactions were optimized by different numerical optimization methods such as:the Levenberg-Marquardt and genetic algorithms and the results were compared with one another.It has been found that the Santamaria model is in good agreement with the experimental data.The Arrhenius parameters of this model have been obtained by linear regression.It should be noted that the Marquardt algorithm is sensitive to the first guesses and there is possibility to trap in the relative minimum. | Shahrnaz Mokhtari Ali Vatani Nastaran Razmi Farooji | 2010 | Journal of Natural Gas Chemistry2010，19，3： | 2 |
| 3 | Feiends and family:A cross-cul-tural investigation of social support and subjective wel-being among col ege students显示文摘 | Debi Robert Cynthia Shahrnaz Noah | | 0，，01： | 1 |
| 4 | Walnut consumption protects rats against cisplatin -induced neurotoxicity 显示文摘 | MOHAMMAD S MASOUD N SHAHRNAZ P | 2012 | Neurotoxicology2012，33，5： | 1 |
| 5 | Walnut consumption protects rats against cisplatin-induced neurotoxicity显示文摘 | Mohammad S Masoud N Shahrnaz P et ol | 2012 | Neuro Toxicology2012，33，5： | 1 |
| 6 | Walnut consumption protects rats against cisplatin-induced neurotoxicity显示文摘 | Mohammad S Masoud N Shahrnaz P | 2012 | NeuroToxicnlogy2012，33，5： | 1 |
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