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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.
Silver-Nanowire-Embedded Transparent Metal-Oxide Heterojunction Schottky Photodetector
Abbas, Sohail,Kumar, Mohit,Kim, Hong-Sik,Kim, Joondong,Lee, Jung-Ho American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.17
<P>We report a self-biased and transparent Cu<SUB>4</SUB>O<SUB>3</SUB>/TiO<SUB>2</SUB> heterojunction for ultraviolet photodetection. The dynamic photoresponse improved 8.5 × 10<SUP>4</SUP>% by adding silver nanowires (AgNWs) Schottky contact and maintaining 39% transparency. The current density-voltage characteristics revealed a strong interfacial electric field, responsible for zero-bias operation. In addition, the dynamic photoresponse measurement endorsed the effective holes collection by embedded-AgNWs network, leading to fast rise and fall time of 0.439 and 0.423 ms, respectively. Similarly, a drastic improvement in responsivity and detectivity of 187.5 mAW<SUP>-1</SUP> and of 5.13 × 10<SUP>9</SUP> Jones, is observed, respectively. The AgNWs employed as contact electrode can ensure high-performance for transparent and flexible optoelectronic applications.</P> [FIG OMISSION]</BR>
Abbas Afshar,Hamideh Kazemi 대한토목학회 2012 KSCE Journal of Civil Engineering Vol.16 No.6
Large scaled simulation models, especially the water quality simulation models, are so complicated that makes calibration processes huge tasks; in order to attain optimum solution, lots of parameters must be calibrated, simultaneously. Methods based on evolutionary algorithm developed new horizons in calibration procedure. Hybrid algorithms are of the newest. In hybrid algorithms,one of the modules is applied as a simulator and the other one takes role as an optimization module. In this article, overcoming these challenges, hybrid ANN-PSO algorithm is applied in calibration process of water quality model CE-QUAL-W2. Here, Particle Swarm Optimization (PSO) provides simulation (CE-QUAL-W2) model with sets of parameters to simulate model. Using these results, Neural Network (estimator) is trained. In the next step, simulator would be replaced with estimator and Artificial Neural Network (ANN) would estimate simulator’s behavior in a way less time. The first goal is to calibrate thermal parameter; going forward through this process needs water surface elevation parameter to be calibrated, too. As a result, the proposed model will become multi-objective one, applied in Karkheh reservoir in Iran during 6 month simulation period. The proposed approach overcomes the high computational efforts required if a conventional calibration search technique was used, while retaining the quality of the final calibration results. Estimator (ANN) embedded in optimization algorithm (PSO) in calibration process,undoubtedly, reduced run time while the answers have reliable quality.
Signatures of Through-Space Charge Transfer in Two-Photon Absorption of Paracyclophane Derivatives
Abbas Salimi,조대흠,이진용,강선우,Shaul Mukamel 대한화학회 2019 Bulletin of the Korean Chemical Society Vol.40 No.11
Third order polarizability, (?) taken from the collective electronic oscillator (CEO) method was used to calculate the two-photon absorption (TPA) of tetrastyryl-[2,2]paracyclophane derivatives with different through-space charge transfer configurations considering various donor and acceptor combinations at the terminal styryl groups. For the virtually same linear absorption, different TPA spectra were obtained. For controlling and fine-tuning frequency and cross-sections of TPA the through-space charge transfer interactions can be used. The results are explained by the electronic density matrices corresponding to governing oscillators in one- and two-photon absorption and the ground state. It is indicated that for the studied systems mainly the lowest four oscillators are responsible for the TPA cross-sections rather than a simple effective three-state model.
Abbas Syed Asad,Ma Ahyeon,Seo Dongho,Lim Yun Ji,Park Joon Yong,Lee Gaehang,Nam Ki Min 대한화학회 2021 Bulletin of the Korean Chemical Society Vol.42 No.11
Electrochemical CO2 reduction to carbon monoxide (CO) is immensely important for sustainable CO2 recycling. In this study, we established a facile synthetic method for large-scale production of Ag nanoparticles, which can be used for the selective electrochemical reduction of CO2 to CO. Thermal decomposition and reduction of AgNO3 produced Ag nanoparticles on a gram-scale in high yield (over 90%) with a homogeneous size distribution. The oleylaminecapped Ag nanoparticles were quasi-spherical with diameters of 9 2 nm. Ag nanoparticles are capable of electrochemical CO2 reduction to CO with high activity and stability. The CO selectivity of the catalyst was in the vicinity of 90% over a wide potential range and reached 94.2% at 1.4 V vs. RHE. The Ag nanoparticles showed good stability over 24 h. Different surface functional groups, for example, thiol and citrate were investigated to understand their influence on the variation in CO selectivity.
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>
Abbas, M.,RamuluTorati, S.,Iqbal, S.,Kim, C. Royal Society of Chemistry 2017 NEW JOURNAL OF CHEMISTRY Vol.41 No.7
<P>Core/shell nanostructures of MNPs/inorganic materials have attracted enormous research interest due to their promising applications in bio-medicine, energy, electronics, the environment, etc. Although several approaches are available for the synthesis of these core/shell nanostructures, the use of large quantities of surfactants, multi-step synthesis procedures and long reaction times still remain as challenges to be overcome for industrial applications. In this study, a novel one-pot sonochemical approach was developed for the synthesis of core/shell iron oxide/silica and iron oxide/carbon nanostructures in aqueous medium. Interestingly, the total reaction time for the synthesis of the core/shell nanostructures is found to be shorter than for other reported methods. Moreover, transmission electron microscopy indicated that the sonochemical technique produces a uniform core/shell with a highly crystalline cubic structure. However, rod-like shaped nanostructures were obtained in the absence of ultrasound. The biocompatibility of the Fe3O4/SiO2 and Fe3O4/C nanocubes and nanorods was investigated and compared with iron oxide nanostructures in in vitro quantification of TK-6 and THP-1 cell viability using a CCK-8 assay.</P>
Abbas Teimouri,Ali Reza Najafi Chermahini,M. Narimani 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.5
A simple highly versatile and efficient method has been developed for the three-component coupling of aldehydes, amines and alkynes to prepare propargylamines, in the presence of a catalytic amount of BiCl3. The advantages of methods are high yield, mild reaction conditions, no environmental pollution and easy work up procedure.