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Akbar Zare,Mehdi Shiva,Ahad Zare,Ali Akbar Mirzaei 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.6
The Co–Ni/Al2O3 catalysts prepared using impregnation procedure, were used for the Fischer–Tropsch synthesis. The effect of calcination conditions of the catalyst as well as reactor situation was studied. It was found that the catalyst calcined at 550 8C for 6 h in air atmosphere has shown the best catalytic performance for CO hydrogenation. The best operational conditions were obtained as following:T = 350 8C, P = 1 atm and H2/CO = 2/1.
A brief review on graphene applications in rechargeable lithium ion battery electrode materials
Sameen Akbar,Muhammad Rehan,Liu Haiyang,Iqra Rafique,Hurria Akbar 한국탄소학회 2018 Carbon Letters Vol.28 No.-
Graphene is a single atomic layer of carbon atoms, and has exceptional electrical, mechanical, and optical characteristics. It has been broadly utilized in the fields of material science, physics, chemistry, device fabrication, information, and biology. In this review paper, we briefly investigate the ideas, structure, characteristics, and fabrication techniques for graphene applications in lithium ion batteries (LIBs). In LIBs, a constant three-dimensional (3D) conductive system can adequately enhance the transportation of electrons and ions of the electrode material. The use of 3D graphene and graphene-expansion electrode materials can significantly upgrade LIBs characteristics to give higher electric conductivity, greater capacity, and good stability. This review demonstrates several recent advances in graphenecontaining LIB electrode materials, and addresses probable trends into the future.
A Product Inhibition Study on Adenosine Deaminase by Spectroscopy and Calorimetry
(Ali Akbar Saboury),(Ghasem Ataie Jafari),(Ali Akbar Moosavi Movahedi),(Mohammad Reza Housaindokht),(Gholam Hosain Hakimelahi),(Adeleh Divsalar) 생화학분자생물학회 2002 BMB Reports Vol.35 No.3
Kinetic and thermodynamic studies have been made on the effect of the inosine product on the activity of adenosine deaminase in a 50 mM sodium phosphate buffer, pH 7.5, at 27oC using UV spectrophotometry and isothermal titration calorimetry (ITC). A competitive inhibition was observed for inosine as a product of the enzymatic reaction. A graphical-fitting method was used for determination of the binding constant and enthalpy of inhibitor binding by using isothermal titration microcalorimetry data. The dissociation-binding constant is equal to 140 μM by the microcalorimetry method, which agrees well with the value of 143 μM for the inhibition constant that was obtained from the spectroscopy method.
Ali Akbar Abbasian Arani,Ali Akbar Azemati,Mohammad Rezaee,Behzad Shirkavand Hadavand 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.5
Natural convection in enclosures containing nanofluids is important in physical and environmental applications. Different models for conduction have been developed because of the importance of this phenomenon in natural convection in enclosures. In this study, effects of conduction models of Chon, Corcione, Khanafer, and Koo and Kleinstreuer on the natural convection inside a trapezoidal enclosure with hot and cold walls are evaluated numerically. The enclosure contains Al 2 O 3 -water nanofluid with variable properties. Effects of the conduction models on fluid flow, natural convection, variations in volume fraction, and diameter of nanoparticles in the models, as well as the variations in the Rayleigh number, are examined. Results show that at Rayleigh numbers of 10 5 and 10 6 , the maximum and minimum values of the average Nusselt number are obtained using the models of Khanafer and Chon, respectively. In all models, the average Nusselt number presents upward and downward trends when the volume fraction of nanoparticles increases but decreases when the diameter of the nanoparticles increases. At Ra = 10 5 in all models, as the volume fraction of nanoparticles increases, the nanofluid provides a higher average Nusselt number compared with the base fluid. By contrast, at Ra = 10 6 , at volume fractions larger than 0.01 and using the model of Chon, the average Nusselt number of the nanofluid is lower compared with that of the base fluid.
A Product Inhibition Study on Adenosine Deaminase by Spectroscopy and Calorimetry
Saboury, Ali Akbar,Divsalar, Adeleh,Jafari, Ghasem Ataie,Moosavi-Movahedi, Ali Akbar,Housaindokht, Mohammad Reza,Hakimelahi, Hosain 생화학분자생물학회 2002 Journal of biochemistry and molecular biology Vol.35 No.3
Kinetic and thermodynamic studies have been made on the effect of the inosine product on the activity of adenosine deaminase in a 50 mM sodium phosphate buffer, pH 7.5, at $27^{\circ}C$ using UV spectrophotometry and isothermal titration calorimetry (ITC). A competitive inhibition was observed for inosine as a product of the enzymatic reaction. A graphical-fitting method was used for determination of the binding constant and enthalpy of inhibitor binding by using isothermal titration microcalorimetry data. The dissociation-binding constant is equal to $140\;{\mu}M$ by the microcalorimetry method, which agrees well with the value of $143\;{\mu}M$ for the inhibition constant that was obtained from the spectroscopy method.
Effect of Outrigger Panels on Seismic Performance of Steel Plate Shear Wall Structural System
Akbar Vasseghi,Vahid Khoshkalam 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.4
Structural systems with steel plate shear wall (SPSW) have been used in many tall buildings in the past decades. This system is particularly suitable for seismic regions because it can dissipate the seismic energy through the inelastic response of steel plate in shear. However, the relatively low lateral stiff ness of the SPSW structural system in tall and slender buildings may result in excessive lateral drift and high seismic demands on vertical boundary elements (VBE). Placement of additional SPSW panels in the structure acting as outriggers could signifi cantly reduce the lateral drifts and seismic demand on the VBEs by redistributing some of the overturning forces to adjacent columns. In this paper, a 40-story building is evaluated using steel plate shear wall structural system with and without outriggers. The outrigger panels are placed in 20th, 30th, and 40th story levels and the eff ectiveness of these elements on the overall seismic behavior is studied. Seven nonlinear time history analyses are carried out and the seismic performance of the structural system with outriggers is compared to the performance of the system without outriggers. The results indicate a signifi cant reduction in lateral drifts and VBE seismic demands when the system is augmented with steel plate outrigger panels.
Akbar Zendehnam,Mina Arabzadegan,Sayed Mohsen Hosseini,Nasrin Robatmili,Sayed Siavash Madaeni 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.6
Polyvinylchloride-blend-styrene butadiene rubber based nanocomposite cation exchange membranes were prepared by solution casting technique. Iron-oxide nanoparticles and Ag-nanolayer were simultaneously utilized as filler and surface modifier in membrane fabrication. The effects of Ag-nanolayer film thickness on membrane physicochemical and antibacterial characteristics of nanocomposite PVC-blend-SBR/Iron-oxide nanoparticles were studied. SEM images showed membrane roughness decreasing by Ag nanolayer thickness increasing. Membrane charge density and selectivity declined by Ag nanolayer coating up to 5 nm in membranes and then showed increasing trend by more nanolayer thickness. Ionic flux also showed increasing trend. Membranes showed good ability in E-Coli removal. 20 nm Ag-nanolayer coated membrane showed better performance compared to others.
Akbar Zendehnam,Mehrfam Rabieyan,Sayed Mohsen Hosseini,Saeideh Mokhtari 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.3
Nanocomposite polyvinyl chloride/multi walled carbon nano tubes (MWCNTs)-co-silver (Ag) nanolayercomposite nanoparticles heterogeneous ion exchange membranes were prepared by solution casting techniques. MWCNTs-co-Ag nanolayer composite nanoparticles were prepared by magnetron sputtering method. The effect ofused composite nanoparticles and electrolyte’s concentration on physico/chemical properties of membranes was studied. Scanning and transmission electron microscopy and X-ray diffraction results showed uniform distribution andcrystalline structure for the composite nanoparticles. Images also showed relatively uniform distribution for the membranes. Membrane transport number, selectivity and electrical conductivity were improved by increase of additive contentin membrane matrix. All mentioned parameters were also enhanced by increase of electrolyte concentration. Membranesexhibited lower selectivity/transport number for bivalent ions compared to monovalent type. Membrane averageroughness was decreased slightly by increase of additive content. Membrane ionic flux was decreased initially byincrease of additive content up to 0.5%wt and then began to increase by more additive concentration. Mechanical stabilityof membranes was also improved by using of composite nanoparticles in membrane matrix. Modified membranecontaining 4%wt composite nanoparticles showed better electrochemical properties compared to others.
A study on the effects of laminating temperature on the polymeric nanofiber web
Akbar Khodaparast Haghi,Mohammad Kanafchian,Masoomeh Valizadeh 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.2
The purpose of this study is to consider the influence of laminating temperature on nanofiber/laminate properties. Hot-press laminating was carried out at five different temperatures and nanofiber web morphology was observed under an optical microscope. Also, air permeability experiments were performed to examine the effect of laminating temperature on breathability of multilayer fabric. Optical microscope images showed that the nanofiber web began to damage when laminating temperature was selected above the melting point of adhesive layer. Air permeability decreased with increasing laminating temperature. It is also observed that the adhesive force between layers was increased by increasing laminating temperature.