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Farsi, Carla,Gillaspy, Elizabeth,Jorgensen, Palle,Kang, Sooran,Packer, Judith Elsevier 2018 Journal of mathematical analysis and applications Vol.468 No.2
<P><B>Abstract</B></P> <P>In this paper, we discuss a method of constructing separable representations of the <SUP> C ⁎ </SUP> -algebras associated to strongly connected row-finite <I>k</I>-graphs Λ. We begin by giving an alternative characterization of the Λ-semibranching function systems introduced in an earlier paper, with an eye towards constructing such representations that are faithful. Our new characterization allows us to more easily check that examples satisfy certain necessary and sufficient conditions. We present a variety of new examples relying on this characterization. We then use some of these methods and a direct limit procedure to identify a faithful separable representation for any row-finite source-free <I>k</I>-graph.</P>
Eosin Biosorption from Aqueous Solution on Two Types of Activated Sludge
( Farsi Cherifa ),( Cherifi Hakima ),( Yous Radhia ),( Hanini Salah ),( Khalladi Razika ) 한국화학공학회 2022 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.60 No.1
In wastewater treatment processes huge quantities of sludge are produced continuously each year. This work investigated the reuse of two types of sludge as biosorbents of a toxic dye. The potential of granular and filamentous fungus dried sludge for the elimination of eosin from aqueous solution was studied in batch system. The effect of initial concentration and temperature was examined. Maximum uptake was observed at 100 mg l<sup>-1</sup> and 30 ℃. The maximum removal rate was 92% for the granular sludge and 90% for the filamentous one. Equilibrium was attained after 30 min for the studied dye concentrations. The equilibrium uptake increased with the initial eosin concentration. The Freundlich and Langmuir adsorption models were also investigated. The reuse of disposed sludge as adsorbent could be a solution for the valorization of such dangerous waste to resolve two environmental problems at the same time.
Farsi, Mohammad,Ghadimi, Parviz The Society of Naval Architects of Korea 2014 International Journal of Naval Architecture and Oc Vol.6 No.3
Main aim of this paper is to find the best combination of numerical schemes for 2-D SPH simulation of wedge water entry. Diffusion term is considered as laminar, turbulent, and artificial viscosity. Density filter that seriously affects the pressure distribution is investigated by adopting no filter, first order filter, and second order filter. Validation of the results indicates that turbulent model and first order density filter can lead to more reasonable solutions. This simulation was then conducted for wedge water entry with wide range of deadrise angles including 10 degrees, 20 degrees, 30 degrees, 45 degrees, 60 degrees and 81 degrees, with extreme deadrise angles of 10 degrees, 60 degrees and 81 degrees being considered. Comparison of SPH results with BEM solutions has displayed favorable agreement. In two particular cases where experimental data are available, the SPH results are shown to be closer to the experiments than BEM solution. While, accuracy of the obtained results for moderate deadrise angles is desirable, numerical findings for very small or very large deadrise angles are also very reasonable.
M. Farsi,A. Jahanmiri 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.3
In this work a water vapor-permselective alumina–silica composite membrane reactor is proposed to overcome the thermodynamic equilibrium limitations and increasing catalyst activity. A steady state heterogeneous model is developed to simulate the proposed configuration. To verify accuracy of the considered model, simulation results of a methanol reactor is compared with the industrial plant data. The membrane reactor benefits are: higher carbon dioxide conversion, higher quality of outlet product,higher catalyst activity. Genetic algorithm is employed to optimize the process performance considering methanol production as the objective function. This configuration has enhanced the methanol yield about 7% compared with conventional reactor.
Mohammad Farsi,Parviz Ghadimi 대한조선학회 2014 International Journal of Naval Architecture and Oc Vol.6 No.3
Main aim of this paper is to find the best combination of numerical schemes for 2-D SPH simulation of wedge water entry. Diffusion term is considered as laminar, turbulent, and artificial viscosity. Density filter that se-riously affects the pressure distribution is investigated by adopting no filter, first order filter, and second order filter. Validation of the results indicates that turbulent model and first order density filter can lead to more reasonable solutions. This simulation was then conducted for wedge water entry with wide range of deadrise angles including 10 degrees, 20 degrees, 30 degrees, 45 degrees, 60 degrees and 81 degrees, with extreme deadrise angles of 10 degrees, 60 degrees and 81 degrees being considered. Comparison of SPH results with BEM solutions has displayed favorable agreement. In two particular cases where experimental data are available, the SPH results are shown to be closer to the experiments than BEM solution. While, accuracy of the obtained results for moderate deadrise angles is desirable, numerical findings for very small or very large deadrise angles are also very reasonable.
M. Farsi, A. Jahanmiri 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
The goal of this research is dynamic operability analysis of dual-membrane reactor considering catalyst deactivation to produce methanol. A dynamic heterogeneous one-dimensional model is developed to predict the performance of this configuration. In this configuration, a conventional reactor has been supported by a Pd/Ag membrane tube for hydrogen permeation and alumina–silica composite membrane tube to remove water vapor from the reaction zone. To verify the accuracy of the considered model, the results of conventional reactor are compared with the plant data. The main advantages of the dual-membrane reactor are: higher catalyst activity and lifetime, higher CO2 conversion and methanol production.
M. Farsi,M.R. Rahimpour,A. Jahanmiri 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.5
In the isobutene synthesis process, coupling reaction and separation improves isobutene production and selectivity, reduces operation cost and lets to produce hydrogen. This study focuses on the steady state optimization of the isobutane dehydrogenation in hydrogen-permselective Pd/Ag based membrane reactors. The membrane reactors have been modeled heterogeneously based on the mass and energy conservation laws at steady state condition. The Genetic algorithm has been considered to optimize the operating condition of membrane reactors. Optimization results of membrane reactors are compared with conventional adiabatic reactors at the same catalyst loading. This optimal configuration has enhanced isobutene mole fraction about 16.4%.
Mohammad Ali Farsi 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.4
Reliability analysis is very important in a practical engineering system. As these systems in space industry such as spacecraft and satellite are used to increase analysis accuracy, the system should be modeled carefully. Since the systems can impress the mission succession. In the real world, usually systems have multilevel performance and components have multimode failures. But often the binary-state model is used to determination of the reliability of the system. Although, the binary-state is simple and useful, so it cannot capture real states of a system. Therefore, calculation accuracy is decreased and mission risk is increased. Especially, if functions and operations in a mission or a system have a dependency, for example, the operations sequentially were occurred. The solar array mechanism is an important sub-system in a satellite, since if this system is failed, power generation may be stopped and satellite is failed. In this paper, a new method is proposed to model and assess reliability via the Universal generating function (UGF) for a solar array mechanism. The capability of this model for evaluation and determination of the reliability of the solar array mechanism as the multi-state system is shown, that subsystems/components work in a logical order or sequence. In comparison to Boolean algebra and crude Monte Carlo methods, the accuracy of this method is acceptable.