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Wani, Zubair R.,Tantray, Manzoor A.,Iqbal, Javed,Farsangi, Ehsan Noroozinejad Techno-Press 2021 Structural monitoring and maintenance Vol.8 No.4
The use of structural control devices to minimize structural response to seismic/dynamic excitations has attracted increased attention in recent years. The use of magnetorheological (MR) dampers as a control device have captured the attention of researchers in this field due to its flexibility, adaptability, easy control, and low power requirement compared to other control devices. However, little attention has been paid to the effect of configuration and number of dampers installed in a structure on responses reduction. This study assesses the control of a five-story structure using one and two MR dampers at different stories to determine the optimal damper positions and configurations based on performance indices. This paper also addresses the fail-safe current value to be applied to the MR damper at each floor in the event of feedback or control failure. The model is mathematically simulated in SIMULINK/MATLAB environment. Linear control strategies for current at 0 A, 0.5 A, 1 A, 1.5 A, 2 A, and 2.5 A are implemented for MR dampers, and the response of the structure to these control strategies for different configurations of dampers is compared with the uncontrolled structure. Based on the performance indices, it was concluded that the dampers should be positioned starting from the ground floor, then the 2<sup>nd</sup> floor followed by 1<sup>st</sup> and rest of the floors sequentially. The failsafe value of current for MR dampers located in lower floors (G+1) should be kept at a higher value compared to dampers at top floors for effective passive control of multi-story structures.
Free vibration of anti-symmetric angle-ply plates with variable thickness
Javed, S.,Viswanathan, K.K.,Aziz, Z.A.,Prabakar, K. Applied Science Publishers ; Elsevier 2016 COMPOSITE STRUCTURES -BARKING THEN OXFORD- Vol.137 No.-
Free vibration of anti-symmetric angle-ply plates with variable thickness is analysed using spline function approximation including the effect of shear deformation. The equations of motion for the plate are derived using the theory of Yang, Norris and Stavsky. Assuming the solution in a separable form, a system of coupled differential equations in displacement and rotational functions are obtained and these functions are approximated by Bickley-type splines of order three. A generalised eigenvalue problem is obtained and solved numerically for an eigenfrequency parameter and an associated eigenvector of spline coefficients. Two and four layered plates consisting of two different materials and plies comprising of same as well as different materials for two different boundary conditions are analysed. The effect of material properties, ply orientation, number of lay ups, aspect ratio and coefficients of thickness variations on the frequency parameter are presented. The accuracy of the result is ascertained by convergence and comparative study.
Free vibration of cross-ply laminated plates based on higher-order shear deformation theory
Saira Javed,K.K. Viswanathan,M.D. Nurul Izyan,Z. A. Aziz,J.H. Lee 국제구조공학회 2018 Steel and Composite Structures, An International J Vol.26 No.4
Free vibration of cross-ply laminated plates using a higher-order shear deformation theory is studied. The arbitrary number of layers is oriented in symmetric and anti-symmetric manners. The plate kinematics are based on higher-order shear deformation theory (HSDT) and the vibrational behaviour of multi-layered plates are analysed under simply supported boundary conditions. The differential equations are obtained in terms of displacement and rotational functions by substituting the stress-strain relations and strain-displacement relations in the governing equations and separable method is adopted for these functions to get a set of ordinary differential equations in term of single variable, which are coupled. These displacement and rotational functions are approximated using cubic and quantic splines which results in to the system of algebraic equations with unknown spline coefficients. Incurring the boundary conditions with the algebraic equations, a generalized eigen value problem is obtained. This eigen value problem is solved numerically to find the eigen frequency parameter and associated eigenvectors which are the spline coefficients.The material properties of Kevlar-49/epoxy, Graphite/Epoxy and E-glass epoxy are used to show the parametric effects of the plates aspect ratio, side-to-thickness ratio, stacking sequence, number of lamina and ply orientations on the frequency parameter of the plate. The current results are verified with those results obtained in the previous work and the new results are presented in tables and graphs.
Electrochemical Behavior of Redox Proteins Immobilized on Nafion-Riboflavin Modified Gold Electrode
S. Rezaei-Zarchi,A. A. Saboury*,J. Hong,P. Norouzi,A. B. Moghaddam,H. Ghourchian,M. R. Ganjali,A. A. Moosavi-Movahedi,A. Javed,A. Mohammadian 대한화학회 2007 Bulletin of the Korean Chemical Society Vol.28 No.12
Electron transfer of a redox protein at a bare gold electrode is too slow to observe the redox peaks. A novel Nafion-riboflavin functional membrane was constructed during this study and electron transfer of cytochrome c, superoxide dismutase, and hemoglobin were carried out on the functional membrane-modified gold electrode with good stability and repeatability. The immobilized protein-modified electrodes showed quasi-reversible electrochemical redox behaviors with formal potentials of 0.150, 0.175, and 0.202 V versus Ag/AgCl for the cytochrome c, superoxide dismutase and hemoglobin, respectively. Whole experiment was carried out in the 50 mM MOPS buffer solution with pH 6.0 at 25 oC. For the immobilized protein, the cathodic transfer coefficients were 0.67, 0.68 and 0.67 and electron transfer-rate constants were evaluated to be 2.25, 2.23 and 2.5 s-1, respectively. Hydrogen peroxide concentration was measured by the peroxidase activity of hemoglobin and our experiment revealed that the enzyme was fully functional while immobilized on the Nafion-riboflavin membrane.
Electrochemical Behavior of Redox Proteins Immobilized on Nafion-Riboflavin Modified Gold Electrode
Rezaei-Zarchi, S.,Saboury, A.A.,Hong, J.,Norouzi, P.,Moghaddam, A.B.,Ghourchian, H.,Ganjali, M.R.,Moosavi-Movahedi, A.A.,Javed, A.,Mohammadian, A. Korean Chemical Society 2007 Bulletin of the Korean Chemical Society Vol.28 No.12
Electron transfer of a redox protein at a bare gold electrode is too slow to observe the redox peaks. A novel Nafion-riboflavin functional membrane was constructed during this study and electron transfer of cytochrome c, superoxide dismutase, and hemoglobin were carried out on the functional membrane-modified gold electrode with good stability and repeatability. The immobilized protein-modified electrodes showed quasireversible electrochemical redox behaviors with formal potentials of 0.150, 0.175, and 0.202 V versus Ag/AgCl for the cytochrome c, superoxide dismutase and hemoglobin, respectively. Whole experiment was carried out in the 50 mM MOPS buffer solution with pH 6.0 at 25 oC. For the immobilized protein, the cathodic transfer coefficients were 0.67, 0.68 and 0.67 and electron transfer-rate constants were evaluated to be 2.25, 2.23 and 2.5 s?1, respectively. Hydrogen peroxide concentration was measured by the peroxidase activity of hemoglobin and our experiment revealed that the enzyme was fully functional while immobilized on the Nafion-riboflavin membrane.
Siyal Sajid Hussain,Javed Muhammad Sufyan,Ahmad Awais,Sajjad Muhammad,Batool Saima,Khan Abdul Jabbar,Akram Shakeel,Alothman Asma A.,Alshgari Razan A.,Najam Tayyaba 한국물리학회 2021 Current Applied Physics Vol.31 No.-
The development of smart structured cathode materials for supercapacitors (SCs) has sparked tremendous interest. However, the appropriate design to achieve high capacitance and energy density-based cathode materials remains a major problem for energy storage systems. This article describes the effective synthesis of selfsupported 3D micro-flowers composed of ultrathin nanowires array of Co3O4 on Ni foam (NF) using hydrothermal conditions (Co3O4@NF). The mesoporous Co3O4@NF with a high surface area, providing a rich active state for the Faraday redox reaction and increasing the diffusion rate of the electrolyte ions. The optimized Co3O4@NF-16h electrode exhibited supreme electrochemical performance by delivering a high specific capacitance of 1878, (1127) and 1200 (720 C g 1) F g 1 at 1.0 and 20 A g 1, respectively. The Co3O4@NF electrode retained good capacitance stability of 91% over 10000 cycles at 20 A g 1 with excellent rate-performance of 67% at 20 folded high current values. The obtained results for the Co3O4@NF electrode are presented the enhanced pseudocapacitive performance, indicating the substantial potential for high-performance supercapacitor applications.
Fekri Abdulraqeb Ahmed Ali,Javed Alam,Arun Kumar Shukla,Mansour Alhoshan,Jamal M. Khaled,Waheed A. Al-Masry,Naiyaf S. Alharbi,Manawwer Alam 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.80 No.-
Biofouling leads to degradation of membrane performance characteristics, including permeability,selectivity, and long-term stability. In this study, silver-doped graphene oxide (GO) was employed as ananoadditive to enhance the biofouling resistance of thin-film nanocomposite (TFN) membranes viainterfacial polymerization. Ag functionalization on GO sheets was carried out by a reduction reaction. Electron microscopy, Raman spectroscopy, and X-ray diffraction analyses were conducted to evaluate Agattachment on GO. According to zeta potential and contact angle measurements as well as atomic forcemicroscopy results, GO-Ag-incorporated TFN membranes showed a high negative charge, hydrophilicity,and a smooth surface. Bovine serum albumin protein and Escherichia coli (E. coli) were used as modelfouling agents to demonstrate the antifouling characteristics of the membranes. The TFN membranecontaining 80 ppm of GO-Ag had a high waterflux recovery ratio (89%) and low irreversible resistance(10%) after hydraulic washing. The biofouling resistance of the membranes was further studied by acolony-counting method, while bacterial adhesion was analyzed by spinning disk confocal microscopeimaging. The TFN membrane prepared with 80 ppm GO-Ag reduced 86% of viable E. coli cells in bacterialsuspensions, with only slight bacterial adherence on the membrane surface.
( Shams Tabrez Khan ),( Rizwan Wahab ),( Javed Ahmad ),( Abdulaziz A. Al-khedhairy ),( Maqsood A. Siddiqui ),( Quaiser Saquib ),( Bahy A. Ali ),( Javed Musarrat ) 한국화학공학회 2015 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.53 No.5
Envisaging the role of Co in theranautics and biomedicine it is immensely important to evaluate its antimicrobial activity. Hence in this study CoO thin nanosheets (CoO-TNs) were synthesized using wet chemical solution method at a very low refluxing temperature (90 oC) and short time (60 min). Scanning electron microscopy of the grown structure revealed microflowers (2~3 μm) composed of thin sheets petals (60~80 nm). The thickness of each individual grown sheet varies from 10~20 nm. Antimicrobial activities of CoO-TNs against two Gram positive bacteria (Micrococcus luteus, and Staphylococcus aureus), and two Gram negative bacteria (Escherichia coli and Pseudomonas aeruginosa) were determined. A 98% and 65% growth inhibition of M. luteus and S. aureus respectively, was observed with 500 μg/ml of CoO-TNs compared to 39 and 34% growth inhibition of E. coli and P. aeruginosa, respectively with the same concentration of CoO-TNs. Hence, synthesized CoO-TNs exhibited antimicrobial activity against Gram negative bacteria and an invariably higher activity against tested Gram positive bacteria. Therefore, synthesized CoO-TNs are less prone to microbial infections.
Anil, Sukumaran,Gopikrishnan, PB,Basheer, Ashik Bin,Vidyullatha, BG,Alogaibi, Yahya A,Chalisserry, Elna P,Javed, Fawad,Dalati, MHN,Vellappally, Sajith,Hashem, Mohamed Ibrahim,Divakar, Darshan Devang Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.8
Background: Oral cancers account for approximately 2% of all cancers diagnosed each year; however, the vast majority (80%) of the affected individuals are smokers whose risk of developing a lesion is five to nine times greater than that of non-smokers. Tobacco smoke contains numerous carcinogens that cause DNA damage, including oxidative lesions that are removed effectively by the base-excision repair (BER) pathway, in which poly (ADP-ribose) polymerase 1 (PARP-1), plays key roles. Genetic variations in the genes encoding DNA repair enzymes may alter their functions. Several studies reported mixed effects on the association between PARP-1 variants and the risk of cancer development. Till now no reported studies have investigated the association between PARP-1 variants and oral squamous cell carcinoma (OSCC) risk in an Indian population. Materials and Methods: In the present case control study 100 OSCC patients and 100 matched controls were genotyped using PARP1 single nucleotide peptides (SNP's) rs1136410 and rs3219090 using TaqMan assays. Results: The results indicated significantly higher risk with PARP1 rs1136410 minor allele "C" (OR=1.909; p=0.02942; CI, 1.060-3.439). SNP rs1136410 also showed significantly increased risk in patients with smoking habit at C/C genotype and at minor allele C. Conclusions: The PAPR-1 Ala762Val polymorphism may play a role in progression of OSCC. Larger studies with a greater number of samples are needed to verify these findings.