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Javadian, Abdolmajid,Zadehbagheri, Mahmoud,Kiani, Mohammad Javad,Nejatian, Samad The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.10
Due to the pattern of growth for electricity consumption, there is a need for developing power networks and transmission lines. The power transmission capacity of lines is limited due to a host of factors. Thus, these lines need series and parallel compensations to reduce losses, increase efficiency, and promote system security. In this paper, flexible alternating current transmission system (FACTS) devices including static VAR compensators (SVC) as parallel compensators, thyristor-controlled series compensation (TCSC) as a series compensator, and high-voltage direct current (HVDC) bonding are modeled. In addition, comprehensive modeling of the simultaneous application of these three devices for load flow is performed, and the effects of these types of compensations are compared. The obtained comprehensive model was implemented on MATLAB software using the Newton-Raphson method on two 9-bus WSCC and 5-bus test system. In this case, the calculation speed and convergence were reduced when compared to applying devices individually due to the increase in equations and the addition of new terms to the load flow equations. Furthermore, more losses were observed in this model, which can probably be improved using an optimal power flow and optimal placement of the devices in the network.
Hamed Reza Javadian 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.6
Poly(N-methylaniline) (PNMA) composite composed of N-methylaniline and poly(ethanol) wasprepared by in situ polymerization technique and characterized using FTIR, SEM-EDS and XRDinstruments. Characterization of product revealed that this composite is crystalline in nature and theparticles size is less than100 nm. The potential of this composite in removal of Cr(VI) ions from syntheticaqueous effluents was investigated by batch sorption system. The experimental results confirmed thatthis adsorbent has the potential application for removal of Cr(VI) ions from aqueous solution with thesorption capacity of 125 mg/g of Cr(VI)/0.1 g of adsorbent.
Hamed Reza Javadian 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.6
The aim of this research is to investigate sorption characteristics of polyaniline/polypyrrole copolymernanofibers (PANI/PPy copolymer nanofibers) for the removal of Co(II) ions from aqueous solution. Theadsorbent is characterized using FE-SEM, TEM, FTIR, TGA, DSC and BET surface area. The sorption of Co(II)ions by batch method is applied and the optimum conditions are investigated. In optimum condition,removal efficiency was 99.68% for 100 mg L-1 Co(II) solution. It is found that temperature has a positiveeffect on the removal efficiency. It can be concluded that PANI/PPy copolymer nanofibers are potentiallyable to removal of Co(II) ions from aqueous solutions.
Hamed Reza Javadian,Mahmood Torabi Angaji,M. Naushad 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
In this study, polyaniline/g-alumina nanocomposite was synthesized by chemical oxidation method and characterized by field emission scanning electron microscopy, transmission electron microscopy, Fourier transform-infrared spectrometer, X-ray diffraction, thermogravimetric analysis, differential scanning calorimetry, and Brunauer–Emmett–Teller method. Batch adsorption experiments were conducted for removing three types of hazardous dyes Reactive Red 194, Acid Blue 62 and Direct Blue 199 from aqueous solution and the effect of pH, adsorbent dosage, contact time, and initial concentration of dyes were investigated. Meanwhile, kinetic, isotherm, and thermodynamic parameters were also determined.
Hamed Reza Javadian,Fatemeh Zamani Sorkhrodi,Behrouz Babzadeh Koutenaei 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
A composite of polyaniline/polypyrrole/hexagonal type mesoporous silica (PANI/PPy/HMS) was prepared, characterized by FE–SEM, FT-IR, XRD, TGA and BET analysis and applied in investigation of its adsorption characteristics for the removal of Cd(II) ions from aqueous solutions. Batch mode experiments were conducted and four kinetic models were used to describe the adsorption process. The adsorption kinetics results showed that the adsorbent had high affinity to Cd(II) in aqueous solutions, and the adsorption reached equilibrium within 8 min. The experimental data were fitted very well with the pseudo-second-order kinetic models. The equilibrium adsorption data were best fitted with the Freundlich isotherm.
Quadratic Derivations on non-Archimedean Banach Algebras
Park, C.,Shagholi, S.,Javadian, A.,Savadkouhi, M.B.,Gordji, M.E. Eudoxus Press LLC 2014 Journal of computational analysis and applications Vol.16 No.3
Let A be an algebra and X be an A-module. A quadratic mapping D : A X is called a quadratic derivation ifD(ab) = D(a)b(2) + a(2) D(b)for all a(1), a(2) is an element of A. We investigate the Hyers-Ulam stability of quadratic derivations from a non-Archimedean Banach algebra A into a non-Archimedean Banach A-module.
M. Naushad,Z.A. ALOthman,Inamuddin,H. Javadian 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.25 No.-
EDTA-Zr(IV) iodate was prepared via the incorporation of aqueous solution of EDTA into the inorganic precipitate of Zr(IV) iodate. Distribution coefficient values for different metals showed that EDTA-Zr(IV) iodate had the highest adsorption capacity for Pb(II). The practical applicability of EDTA-Zr(IV) iodate was explored by separating Pb(II) metal from a synthetic mixture of metal ions. Dependence of adsorption on contact time, pH of the solution, exchanger dose and temperature was studied to achieve the optimum conditions. Kinetic studies showed better applicability for pseudo-second-order model. Thermodynamic parameters viz. – entropy change, enthalpy change and Gibb’s free energy change were also calculated.
Fardin Sadeghfar,Mehrorang Ghaedi,Arash Asfaram,Ramin Jannesar,Hamedreza Javadian,Vahid Pezeshkpour 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.65 No.-
In this research study, the polyvinyl alcohol/Fe3O4@carbon nanotubes (PVA/Fe3O4@CNTs) nanocomposite was prepared by electrochemical-assisted synthesis method, characterized by FT-IR, UV–vis, FE-SEM, TEM, BET and XRD techniques, and subsequently applied for the ultrasound-assisted removal of methylene blue (MB) dye from aqueous solution and as antibacterial agent in vitro investigation against Proteus mirabilis (PM), Methicillin-resistant Staphylococcus aureus (MRSA), Escherichia coli (E. Coli) and Pseudomonas aeruginosa (PAO1) bacteria. The effects of important variables such as the initial concentration of MB, adsorbent mass, sonication time and pH on the removal percentage of MB were investigated and optimized by central composite design (CCD). The experimental results were applied for the construction of a quadratic model to predict the response following the analysis of variance (ANOVA) and to obtain useful information about the possible interaction between the variables and their main effects. The high F-value (207.38), low P-value (<0.0001) and non-significant lack of fit (P-value > 0.05) along with the reasonable value of the coefficient of determination (R2 = 0.99452) confirmed a good correlation between the experimental and predicted values. The highest removal percentage of 99.5% was attained at the optimum conditions of 0.035 g of the adsorbent, 25.0 mg L−1 of dye concentration, 6 min sonication time and pH = 5.5. The adsorption process of MB by PVA/3 wt% Fe3O4@CNTs was well described by pseudo-second-order kinetic and Langmuir isotherm models. A low dose of PVA/Fe3O4@CNTs nanocomposite (0.005 g) was successfully used for the adsorption of MB (R% > 90.0%) within a short time (6.0 min) with the highest monolayer adsorption capacity of 250.10 mg g−1 at 25 °C.
Removal of oil from biodiesel wastewater by electrocoagulation method
Mohsen Vafaie Sefti,Saeb Ahmadi,Ebrahim Sardari,Hamed Reza Javadian,Reza Katal 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.3
An attempt has been made to remove oil and grease (O&G) from biodiesel wastewater as well as O&G and turbidity in the presence of H2O2 and polyaluminum chloride (PAC), as a coagulant-aid by an electrochemical method using iron as sacrificial electrodes. The effects of current density, amount of hydrogen peroxide using as an oxidizing agent and addition of coagulant-aid, on percent removal and energy consumption have been investigated. The removal efficiency of O&G was in the range of 62-86%, whereas O&G removal was 100% in the current density range of 10-12.5 mAcm−2 depending on the concentrations of H2O2 and coagulant aid. It is obtained that electrocoagulation in the absence of coagulant aid and oxidant is not too efficient for the treatment of this type of wastewater.