Temperature-dependent nonlocal nonlinear buckling analysis of functionally graded SWCNT-reinforced microplates embedded in an orthotropic elastomeric medium

Ali Akbar Mosallaie Barzoki,Abbas Loghman,Ali Ghorbanpour Arani 국제구조공학회 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.53 No.3

In this study, nonlocal nonlinear buckling analysis of embedded polymeric temperaturedependent microplates resting on an elastic matrix as orthotropic temperature-dependent elastomeric medium is investigated. The microplate is reinforced by single-walled carbon nanotubes (SWCNTs) in which the equivalent material properties nanocomposite are estimated based on the rule of mixture. For the carbon-nanotube reinforced composite (CNTRC) plate, both cases of uniform distribution (UD) and functionally graded (FG) distribution patterns of SWCNT reinforcements are considered. The small size effects of microplate are considered based on Eringen’s nonlocal theory. Based on orthotropic Mindlin plate theory along with von Kármán geometric nonlinearity and Hamilton's principle, the governing equations are derived. Generalized differential quadrature method (GDQM) is applied for obtaining the buckling load of system. The effects of different parameters such as nonlocal parameters, volume fractions of SWCNTs, distribution type of SWCNTs in polymer, elastomeric medium, aspect ratio, boundary condition, orientation of foundation orthtotropy direction and temperature are considered on the nonlinear buckling of the microplate. Results indicate that CNT distribution close to top and bottom are more efficient than those distributed nearby the mid-plane for increasing the buckling load.

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.

Nonlinear stability of non-axisymmetric functionally graded reinforced nano composite microplates

Abbas Loghman,Ali Ghorbanpour Arani,Ali Akbar Mosallaie Barzoki 사단법인 한국계산역학회 2017 Computers and Concrete, An International Journal Vol.19 No.6

The nonlinear buckling response of nano composite anti-symmetric functionally graded polymeric microplate reinforced by single-walled carbon nanotubes (SWCNTs) rested on orthotropic elastomeric foundation with temperature dependent properties is investigated. For the carbon-nanotube reinforced composite (CNTRC) microplate, a uniform distribution (UD) and four types of functionally graded (FG) distribution are considered. Based on orthotropic Mindlin plate theory, von Kármán geometric nonlinearity and Hamilton’s principle, the governing equations are derived. Generalized differential quadrature method (GDQM) is employed to calculate the non-linear buckling response of the plate. Effects of FG distribution type, elastomeric foundation, aspect ratio (thickness to width ratio), boundary condition, orientation of foundation orthotropy and temperature are considered. The results are validated. It is found that the critical buckling load without elastic medium is significantly lower than considering Winkler and Pasternak medium.

Direct numerical simulations of inertial settling of non-Brownian particles

Ali Abbas Zaidi,Takuya Tsuji,Toshitsugu Tanaka 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.4

The dynamics of particles settling at moderate Reynolds number is studied with periodic boundary conditions. The particle Reynolds number ranges from 0.1 to 50, and the solid volume fraction ranges from single sphere to0.4. Particle-fluid interactions are solved by immersed boundary method and particle-particle interactions are solved bydiscrete element method. The principal results are the average settling velocity and the structure formation of particles. The average sedimentation velocities of particles for moderate Reynolds number showed deviation from the well-knownpower law, and the difference keeps on increasing with decrease in solid volume fractions. This deviation is removed byproposing the division of the power law into three regions of Reynolds number for dilute and non-dilute regimes. Byanalyzing the particle structures, this difference is due to the particle arrangements by the wake interactions at moderateReynolds number.

Deadline Aware Hybrid Data Forwarding Scheme in Delay Tolerant Networks

Ali Abbas,Ki-Il Kim 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.1

Modulating the molecular orbitals of matter through tailoring at the nanoscale using a topographic interface to enable versatile colloidal current devices

Abbas Ali,Hyeonseol Kim,Yumin Kang,Byeonghwa Lim,Keonmok Kim,CheolGi Kim 한국자기학회 2023 한국자기학회 학술연구발표회 논문개요집 Vol.33 No.1

Effect of biochar on cadmium bioavailability and uptake in wheat (Triticum aestivum L.) grown in a soil with aged contamination

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>

Quantum Computing Cryptography and Lattice Mechanism

Abbas M. Ali Al-muqarm,Firas Abedi,Ali S. Abosinnee 한국정보통신학회 2022 Journal of information and communication convergen Vol.20 No.4

Classical cryptography with complex computations has recently been utilized in the latest computing systems to create secret keys. However, systems can be breached by fast-measuring methods of the secret key; this approach does not offer adequate protection when depending on the computational complexity alone. The laws of physics for communication purposes are used in quantum computing, enabling new computing concepts to be introduced, particularly in cryptography and key distribution. This paper proposes a quantum computing lattice (CQL) mechanism that applies the BB84 protocol to generate a quantum key. The generated key and a one-time pad encryption method are used to encrypt the message. Then Babai’s algorithm is applied to the ciphertext to find the closet vector problem within the lattice. As a result, quantum computing concepts are used with classical encryption methods to find the closet vector problem in a lattice, providing strength encryption to generate the key. The proposed approach is demonstrated a high calculation speed when using quantum computing.

A new control approach for seismic control of buildings equipped with active mass damper: Optimal fractional-order brain emotional learning-based intelligent controller

Abbas-Ali Zamani,Sadegh Etedali 국제구조공학회 2023 Structural Engineering and Mechanics, An Int'l Jou Vol.87 No.4

The idea of the combination of the fractional-order operators with the brain emotional learning-based intelligent controller (BELBIC) is developed for implementation in seismic-excited structures equipped with active mass damper (AMD). For this purpose, a new design framework of the mentioned combination namely fractional-order BEBIC (FOBELBIC) is proposed based on a modified-teaching-learning-based optimization (MTLBO) algorithm. The seismic performance of the proposed controller is then evaluated for a 15-story building equipped with AMD subjected to two far-field and two near-field earthquakes. An optimal BELBIC based on the MTLBO algorithm is also introduced for comparison purposes. In comparison with the structure equipped with a passive tuned mass damper (TMD), an average reduction of 44.7% and 42.8% are obtained in terms of the maximum absolute and RMS top floor displacement for FOBELBIC, while these reductions are obtained as 30.4% and 30.1% for the optimal BELBIC, respectively. Similarly, the optimal FOBELBIC results in an average reduction of 42.6% and 39.4% in terms of the maximum absolute and RMS top floor acceleration, while these reductions are given as 37.9% and 30.5%, for the optimal BELBIC, respectively. Consequently, the superiority of the FOBELBIC over the BELBIC is concluded in the reduction of maximum and RMS seismic responses.

Effectiveness of Immersive Virtual Reality-Based Communication for Construction Projects

Ali Abbas,최민지,서준오,차승현,Heng Li 대한토목학회 2019 KSCE Journal of Civil Engineering Vol.23 No.12

Though computer-mediated communication technologies such as immersive virtual reality (IVR) have recently shown considerablepromise, their effectiveness as methods of communication among the participants in construction projects has yet to be systematically investigated. This study helps fill this gap via a detailed comparison of traditional face-to-face (FtF) discussion of Building Information Modeling (BIM) information displayed on a monitor screen against IVR-based communication with BIM information embedded in the immersive environment. The results of experiments in which groups of participants discussed and chose optimal design options indicated that there is no large statistical difference in IVR-based and FtF communication in terms of discussion quality (level of effectiveness and satisfaction experienced), communication richness (detailed responses and vivid messages), and openness (enjoyableness and open-mindedness) during the communication. However, for the accuracy of communication (information communicated correctly and understood properly), FtF communication was better than IVR-based communication, which is assumed due to weak human-human to interaction in IVR. In addition, the communication appropriateness (behavioral acts such as politeness or social norms), IVR-based communication was significantly less than FtF communication, indicating that communicating with others only seeing virtual avatar could make it difficult to discern participant’ reactions or identify appropriate moments to speak. These results could confirm certain advantages of adopting IVR-based communication while further improvement for real-like interaction between people needs to be made for more effective use of IVR communication.