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Abbas Saadat,AliAsghar Behnamghader,Saeed Karbasi,Daryoush Abedi,Masoud Soleimani,Abbas Shafiee 한국생물공학회 2013 Biotechnology and Bioprocess Engineering Vol.18 No.3
Nanocomposites have recently been identified as a useful scaffolding material in tissue engineering applications. Poly (3-hydroxybutyrate)/hydroxyapatite nanoparticles (P3HB)/(nHA) porous scaffolds were successfully fabricated through a solvent casting and particulate leaching technique. P3HB/nHA and P3HB scaffolds were prepared by the same technique for comparison. The structure of the nanocomposite and P3HB scaffolds was observed by SEM. The Energy Disperssive X-ray Analysis (EDXA, map of Ca)results indicated that HA nanoparticles were homogeneously dispersed in the P3HB matrix. X-ray diffraction (XRD)analysis showed that P3HB and HA coexist in the nanocomposite. Transmission electron microscopy (TEM)images also showed that the particle size of HA was 30 ~40 nm. The porosity of the scaffolds was 84%, and macropores and micropores coexisted and interconnected throughout the scaffolds. Acellular bioactivity experiments showed that more HA crystals formed on the surface of the nanocomposite scaffold than on the P3HB scaffold after 4weeks immersion in Simulated Body Fluid (SBF). Cell culture experiments demonstrated that the P3HB/nHA nanocomposite scaffold had a better tendency of proliferation and Alkaline Phosphatase (ALP) activity to MG 63 cells than the pure P3HB scaffold. It was found that nHA addition can improve acellular and cellular bioactivity of the P3HB scaffold.
ANALYSIS OF A FOURTH ORDER SCHEME AND APPLICATION OF LOCAL DEFECT CORRECTION METHOD
Abbas, Ali The Korean Society for Computational and Applied M 2014 Journal of applied mathematics & informatics Vol.32 No.3
This paper provides a new application similar to the Local Defect Correction (LDC) technique to solve Poisson problem -u"(x) = f(x) with Dirichlet boundary conditions. The exact solution is supposed to have high activity in some region of the domain. LDC is combined with a fourth order compact scheme which is recently developed in Abbas (Num. Meth. Partial differential equations, 2013). Numerical tests illustrate the interest of this application.
Optimal Design of Low-Speed Secondary-Sheet Single-Sided Linear Induction Motor
Abbas Shiri,Abbas Shoulaie 대한전기학회 2013 Journal of Electrical Engineering & Technology Vol.8 No.3
Among different linear motors, single-sided linear induction motors have been widely used in industry due to their simplicity and low construction cost. However, these types of motors suffer from low efficiency and power factor. In this paper, an effective procedure is proposed to design single-sided linear induction motors. The designed motor is simulated in MATLAB software in order to investigate the effect of design parameters on the performance of the machine. Regarding the obtained results, the Genetic Algorithm is employed to optimize the design considering product of efficiency and power factor as objective function. The results show significant improvement of the performance. Finally, experimental results and 2D finite element method is used to validate the model parameters and the optimization results.
Abbas, T.,Rizwan, M.,Ali, S.,Zia-ur-Rehman, M.,Farooq Qayyum, M.,Abbas, F.,Hannan, F.,Rinklebe, J.,Sik Ok, Y. Academic Press 2017 Ecotoxicology and environmental safety Vol.140 No.-
<P>Cadmium (Cd) is a well-known and widespread toxic heavy metal while the effects of biochar (BC) on Cd bioavailability and toxicity in wheat, especially in soils with aged contamination are largely unknown. In the present study, the effect of rice straw BC on Cd immobilization in soil and uptake by wheat in an agricultural contaminated-soil was investigated. Different levels of rice straw BC (0%, 1.5%, 3.0% and 5% w/w) were incorporated into the soil and incubated for two weeks. After this, wheat plants were grown in the amended soil until maturity. The results show that the BC treatments increased the soil and soil solution pH and silicon contents in the plant tissues and in the soil solution while decreased the bioavailable Cd in soil. The BC application increased the plant-height, spike-length, shoot and root dry mass and grain yield in a dose additive manner when compared with control treatment. As compared to control, BC application increased the photosynthetic pigments and gas exchange parameters in leaves. Biochar treatments decreased the oxidative stress while increased the activities of antioxidant enzymes in shoots compared to the control. The BC treatments decreased the Cd and Ni while increased Zn and Mn concentrations in shoots, roots, and grains of wheat compared to the control. As compared to the control, Cd concentration in wheat grains decreased by 26%, 42%, and 57% after the application of 1.5%, 3.0%, and 5.0% BC respectively. Overall, the application of rice straw BC might be effective in immobilization of metal in the soil and reducing its uptake and translocation to grains.</P>
Resistive Switching Characteristics of Tantalum Oxide and Titanium Oxide Heterojunction Devices
Abbas, Haider,Abbas, Yawar,Park, Mi Ra,Hu, Quanli,Lee, Tae Sung,Cho, Jongweon,Yoon, Tae-Sik,Choi, Young Jin,Kang, Chi Jung American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.10
<P>In this study, single-layer and trilayer devices with Pt/Ti/TaO2/Pt and Pt/Ti/TiOx/TaO2/TiOx/Pt structures were fabricated. For the trilayer device, a tantalum oxide thin film was sandwiched between the titanium oxide thin films. The thickness of the tantalum oxide in the single-layer device was similar to 20 nm. The total trilayer oxide thickness was similar to 17.5 nm. The trilayer heterojunction device exhibited very stable bipolar resistive switching, which could be caused by the formation and rupture of the conducting filaments (CFs) in the oxide switching layers. The trilayer device showed better endurance and retention characteristics and low SET and RESET voltages, with very small variations. The conduction mechanisms of ohmic conduction, space-charge-limited conduction, Poole-Frenkel emission, and Schottky conduction have been investigated as the possible conduction mechanisms for the resistive switching of the devices.</P>
A memristor crossbar array of titanium oxide for non-volatile memory and neuromorphic applications
Abbas, Haider,Abbas, Yawar,Truong, Son Ngoc,Min, Kyeong-Sik,Park, Mi Ra,Cho, Jongweon,Yoon, Tae-Sik,Kang, Chi Jung IOP 2017 Semiconductor science and technology Vol.32 No.6
<P>In this work 3 × 3 crossbar arrays of titanium oxide were fabricated and tested for non-volatile memory applications and neuromorphic pattern recognition. The non-volatile memory characteristics of the memristor were examined using retention tests for each memristor. In order to test neuromorphic pattern recognition, the memristor crossbar array was programmed to store ‘111’, ‘100’ and ‘010’ at the first, second and third columns of the array, where ‘0’ and ‘1’ represent the high-resistance state (HRS) and low-resistance state (LRS), respectively. The three similar input patterns of ‘111’, ‘100’ and ‘010’ were applied to the crossbar array, for pattern recognition. Using a twin memristor crossbar array mechanism all three input patterns were recognized.</P>
Abbas Rahmani,Abbas Ali Rostami,Mohsen Pirdashti,Poorya Mobalegholeslam 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.4
Liquid-liquid equilibrium data for poly vinyl pyrrolidone (PVP) K30+K2HPO4+H2O system were measured at 298.15 K and different pH values (7.54, 8.05, and 9.47). A binodal curve was fitted to the Merchuk equation and the tie line compositions were fitted to both the Othmer-Tobias and Bancroft equations. The refractive indices and densities of several homogeneous binary and ternary solutions used for calibration were also measured within a range of 0-30 mass% of PVP and 0-50 mass% of K2HPO4. Then, the viscosities, densities, electrical conductivities, and refractive indices of binary (PVP K30+water; potassium phosphate+water) and ternary (PVP K30+potassium phosphate+ water) systems were measured and correlated at different pH values. The density data showed a linear variation of the polymer and salt mass fractions. The viscosity data of PVP K30 solutions were correlated as a function of the mass fractions by using a nonlinear equation. The effects of the tie line lengths on the densities and viscosities of the aqueous two-phase systems were represented. Also, the modified UNIFAC-NRF is used to calculate the phase equilibria of the mention system. The fitted binary interaction parameters of the model were reported.
Optimal Design of Low-Speed Secondary-Sheet Single-Sided Linear Induction Motor
Shiri, Abbas,Shoulaie, Abbas The Korean Institute of Electrical Engineers 2013 Journal of Electrical Engineering & Technology Vol.8 No.3
Among different linear motors, single-sided linear induction motors have been widely used in industry due to their simplicity and low construction cost. However, these types of motors suffer from low efficiency and power factor. In this paper, an effective procedure is proposed to design single-sided linear induction motors. The designed motor is simulated in MATLAB software in order to investigate the effect of design parameters on the performance of the machine. Regarding the obtained results, the Genetic Algorithm is employed to optimize the design considering product of efficiency and power factor as objective function. The results show significant improvement of the performance. Finally, experimental results and 2D finite element method is used to validate the model parameters and the optimization results.