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Implementation of electrolyte CPA EoS to model solubility of CO2 and CO2+ H2S mixtures in aqueous MDEA solutions

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Chinese Journal of Chemical Engineering 2019年第8期27卷 1912-1920页

作者： alireza Afsharpour Ali Haghtalab Department of Chemical Engineering Tarbiat Modares UniversityP.O.Box 14115-114TehranIran Faculty of Chemical and Materials Engineering Shahrood University of TechnologyShahroodIran

The electrolyte version of SRK plus association equation of state(e SRK-CPA Eo S) was employed to correlate CO2 solubility in MDEA aqueous solutions. The applied model comprises the classic form of CPA Eo S including SRK Eo S plus Wertheim association term in addition to MSA theory and Born terms so that the two last terms are responsible for the long-range interactions. A reaction-containing bubble pressure computation technique comprising two nested loops was utilized to model the systems. The internal loop, calculates the liquid phase concentrations via reaction, mass and charge balance equation solving, whereas, the vapor phase concentrations will be obtained in the external one. 470 experimental data were used to correlate binary subsystems and the H2O + MDEA + CO2 ternary system. Since, there not exist any binary VLE data for MDEA + CO2 subsystem, two fitting scenarios were applied. At the first scenario, the binary interaction parameter was assumed equal to zero, while, in second approach the parameter was obtained through ternary system correlation. Both scenarios show very good accuracy in that the Absolute Average Deviation percentages(AAD) obtained were 19.12% and 18.85%, respectively. Also, to show the efficiency of the used model, a comparison between our results and those of the best-known models was ***, having model parameters for H2S solubility from our previous work [A. Afsharpour, Petroleum Science and Technology 35(3)(2017) 292-298], simultaneous solubility of CO2+ H2S mixtures in MDEA solutions was predicted using the e SRK-CPA Eo S with no new optimizable parameters. As the results show,the applied model has a good performance for correlation and prediction of acid gas solubility in a wide range of pressures, temperatures, acid gas loadings, and MDEA concentrations.

关键词： Acid gas solubility MDEA Thermodynamic modeling Phase equilibria CPA EoS Prediction

Intelligent modeling and identification of aircraft nonlinear flight

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Chinese Journal of Aeronautics 2014年第4期27卷 759-771页

作者： alireza Roudbari Fariborz Saghafi Department of Aerospace Engineering Sharif University of Technology

In this paper, a new approach has been proposed to identify and model the dynamics of a highly maneuverable fighter aircraft through artificial neural networks（ANNs）. In general, aircraft flight dynamics is considered as a nonlinear and coupled system whose modeling through ANNs, unlike classical approaches, does not require any aerodynamic or propulsion information and a few flight test data seem sufficient. In this study, for identification and modeling of the aircraft dynamics, two known structures of internal and external recurrent neural networks（RNNs） and a proposed structure called hybrid combined recurrent neural network have been used and *** order to improve the training process, an appropriate evolutionary method has been applied to simultaneously train and optimize the parameters of ANNs. In this research, it has been shown that six ANNs each with three inputs and one output, trained by flight test data, can model the dynamic behavior of the highly maneuverable aircraft with acceptable accuracy and without any priori knowledge about the system.

关键词： Flight test Genetic algorithms Nonlinear flight dynamicsNonlinear systemidentification Recurrent neural network

Reliability Assessment of Integrated Electricity and Natural Gas Transmission Systems in Presence of Power-to-gas and Combined Heat and Power Technologies

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CSEE Journal of Power and Energy Systems 2023年第3期9卷 1193-1202页

作者： alireza Tabebordbar Mohammad Rastegar School of Electrical and Computer Engineering Shiraz UniversityShiraz 71946-84636Iran(the Islamic Republic of)

Assessing the reliability of integrated electricity and gas systems has become an important issue due to the strong dependence of these energy networks through the power-to-gas(P2G)and combined heat and power(CHP)*** current work,initially,presents a detailed energy flow model for the integrated power and natural gas system in light of the P2G and CHP *** the simultaneous load flow of networks,a contingency analysis procedure is proposed,and reliability is assessed through sequential Monte Carlo *** current study examines the effect of independent and dependent operation of energy networks on the reliability of the *** particular,the effect of employing both P2G and CHP technologies on reliability criteria is *** addition,a series of sensitivity analysis are performed on the size and site of these technologies to investigate their effects on system *** proposed method is implemented on an integrated IEEE 24-bus electrical power system and 20-node Belgian natural gas *** simulation procedure certifies the proposed method for reliability assessment is practical and *** addition,the results prove connection between energy networks through P2G and CHP technologies can improve reliability of networks if the site and size of technologies are properly determined.

关键词： CHP technology P2G technology integrated electrical power and natural gas network reliability assessment sequential Monte Carlo simulation method

Nonlinear vibration analysis of a circular micro-plate in two-sided NEMS/MEMS capacitive system by using harmonic balance method

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Acta Mechanica Sinica 2019年第1期35卷 129-143,I0004页

作者： Milad Saadatmand alireza Shooshtari Department of Electrical Engineering Technical University of DenmarkKgs.LyngbyDenmark Department of Mechanical Engineering Bu-Ali Sina UniversityHamedanIran

In this study, forced nonlinear vibration of a circular micro-plate under two-sided electrostatic, two-sided Casimir and external harmonic forces is investigated analytically. For this purpose, at first, von Karman plate theory including geometrical nonlinearity is used to obtain the deflection of the micro-plate. Galerkin decomposition method is then employed, and nonlinear ordinary differential equations (ODEs) of motion are determined. A harmonic balance method (HBM) is applied to equations and analytical relation for nonlineaT frequency response (F-R) curves are derived for two categories (including and neglecting Casimir force) separately. The analytical results for three cases:(1) semi-linear vibration;(2) weakly nonlinear vibration;(3) highly non linear vibration, are validated by comparing with the numerical solutio ns. After validation, the effects of the voltage and Casimir force on the natural frequency of two-sided capacitor system are investigated. It is shown that by assuming Casimir force in small gap distances, reduction of the natural frequency is considerable. The influences of the applied voltage, damping, micro-plate thickness and Casimir force on the frequency response curves have been presented too. The results of this study can be useful for modeling circular parallel-plates in nano /microelectromechanical transducers such as microphones and pressure sensors.

关键词： Nonlinear vibration Two-sided MEMS capacitor Circular plate Harmonic balance method

Indole cyanation via C-H bond activation under catalysis of Ru(Ⅲ)-exchanged NaY zeolite(RuY) as a recyclable catalyst

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Chinese Chemical Letters 2012年第8期23卷 903-906页

作者： alireza Khorshidi Department of Chemistry Faculty of SciencesUniversity of GuilanP.O.Box:41335-1914RashtIran

Selective 3-cyanation of indoles was achieved under heterogeneous catalysis of Ru（III）-exchanged NaY zeolite （RuY） as a recyclable catalyst, in combination with K4[Fe（CN）6] as a nontoxic, slow cyanide releasing ... 详细信息

关键词： Cyanation Indole Zeolite Heterogeneous Catalysis

A New Characterization of L_2(r) by Their Sylow Numbers

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Acta Mathematica Sinica,English Series 2015年第10期31卷 1593-1598页

作者： alireza Khalili ASBOEI Department of Mathematics Farhangian University Department of Mathematics Buinzahra Branch Islamic Azad University

Let G be a finite centerless group, let π（G） be the set of prime divisors of the order of G, and let np（G） be the number of Sylow p-subgroups of G, that is, np（G） = ｜Sylp（G）｜. Set NS（G）：= ｜np（G）｜ p ∈ π（G）}. In this paper, we are investigating whether L2（r） is determined up to isomorphism by NS（L2（r）） when r is prime.

关键词： Finite group simple group Sylow subgroup

Geochemical indices of soil development on basalt rocks in arid to sub-humid climosequence of Central Iran

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Journal of Mountain Science 2020年第7期17卷 1652-1669页

作者： Ahmad HEIDARI alireza RAHEB Soil Science Department College of Agriculture and Natural ResourcesUniversity of TehranKarajP.O.Box 4111Iran

Quantitative weathering indices are efficient tools in determining the soil development from the underlying *** order to evaluate the effects of climate on the soils developed under an arid to sub-humid climosequence in central Iran,twenty soil-development indices were *** samples from six pedons were analyzed for routine physico-chemical and geochemical analyses using X-ray fluorescence(XRF).The lowest and highest calculated soil development indices were observed in the arid and sub-humid regions *** the studied indices,fifteen indices showed similar trends concerning the intensity of *** consistency of such trends reveals the feasibility of using these indices to evaluate basalt weathering rate and soil development in arid,semi-arid and sub-humid *** study demonstrated that,among the evaluated weathering indices,the Weathering Index of Parker(WIP)and mass transfer coefficient(τ)were the most proper indices for predicting basalt weathering *** is due to the fact that these indices use the highly mobile earth elements which are the most sensitive elements in basalt chemical *** calculated indices were subdivided into three subgroups including the ratios of mobile/immobile,mobile/mobile and immobile/mobile elements based on the elements used in their *** state of soil evolution was more accurately predicted compared to the other subgroups using the mobile/immobile subgroup of ***,the weathering indices calculated using the mobile elements are better indicators of weathering intensity,soil formation and the exogenous processes across the arid to sub-humid climosequence.

关键词： Basalt Climosequence Geochemical properties Aridisols Mollisols Inceptisols

A microemulsion method for preparation of thiol-functionalized gold nanoparticles

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Particuology 2018年第2期16卷 33-36页

作者： Somayeh Tianimoghadam alireza Salabat Department of Chemistry Faculty of Science Lorestan University 68137-1-7133 Khorramabad Iran Department of Chemistry Faculty of Science Arak University 38156-8-8349 Arak Iran Institue of Nanosciences & Nanotechnolgy Arak University 38156-8-8349 Arak Iran

A new microemulsion method using tetraoctylammonium bromide as a cationic surfactant has been formulated to fabricate thiol-functionalized gold nanoparticles, The nanoparticles were compared with those synthesized by the multistep Brust two-phase *** nanoparticle sizes and size distributions fabricated by the two methods were characterized by UV-vis ahsorbance spectroscopy and transmittance electron microscopy. The simple microemulsion method produced the same results as those obtained by the Brust method,

关键词： Gold nanoparticles Brust method Microemulsion Thiol-functionalized gold

Ultrasonic irradiation and solvent effects on destabilization of colloidal suspensions of platinum nanoparticles

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Particuology 2014年第6期12卷 145-148页

作者： alireza Salabat Shima Soleimani Department of Chemistry Faculty of ScienceArak University

In this work,ultrasonic irradiation and destabilizer solvent were used for destabilizing colloidal platinum *** stabilized platinum nanoparticles were prepared in w/o microemulsion systems composed of sodium bis-（2-ethylhexyl） sulfosuccinate（AOT） and four different solvents,namely,cyclohexane,n-hexane,n-heptane,and *** recovery process of Pt nanoparticles from the colloidal systems was performed by exposing the colloidal samples to ultrasonic irradiation and applying various destabilizing *** of UV-visible spectra confirms that the quantity of Pt nanoparticles removed from the suspension depends on the length of time of the ultrasonic irradiation and the nature of the microemulsion oil phase.A critical time for the ultrasonic irradiation has been introduced for the phase separation of colloidal *** perform the solvent study,four destabilizer solvents,namely,dioxane,ethyl acetate,diethyl ether,and tetrahydrofuran,were used for breaking the colloidal suspension of platinum *** on the ’good solvent’ and ’poor solvent’ idea,it is verified that the effect of the destabilizer solvents on the aggregation process follows the following order：tetrahydrofuran 〉 ethyl acetate 〉dioxane〉 diethyl ether.

关键词： Colloid destabilization Ultrasonic irradiation Microemulsion Solvent effect