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Repair of precracked RC rectangular shear beams using CFRP strip technique
Abdul Aziz Abdul Samad,Abang Abdullah Abang Ali,J. Jayaprakash,Ashrabov Anvar Abbasovich 국제구조공학회 2007 Structural Engineering and Mechanics, An Int'l Jou Vol.26 No.4
The exploitation of fibre reinforced polymer composites, as external reinforcement is an evergreen and well-known technique for improving the structural performance of reinforced concrete structures. The demand to use FRP composites in the civil engineering industry is mainly due to its high strength, light weight, and stiffness. This paper exemplifies the shear strength of partially precracked reinforced concrete rectangular beams repaired with externally bonded Bi-Directional Carbon Fibre Reinforced Polymer (CFRP) Fabrics strips. All specimens were cast in the laboratory environment without any internal shear reinforcement. The test parameters were longitudinal tensile reinforcement, shear span to effective depth ratio, spacing of CFRP strips, and orientation of CFRP reinforcement. It mainly focuses on the shear capacity and modes of failure of the CFRP strengthened shear beams. Results have shown that the CFRP repaired beams attained a shear enhancement of 32% and 107.64% greater than the control beams. This study underscores that the CFRP strip technique significantly enhanced the shear capacity of precracked reinforced concrete rectangular beams without any internal shear reinforcement.
Aziz, Md. Abdul,Shanmugam, Sangaraju Elsevier 2017 Journal of Power Sources Vol.337 No.-
<P><B>Abstract</B></P> <P>A high-performance composite membrane for vanadium redox flow battery (VRB) consisting of ZrO<SUB>2</SUB> nanotubes (ZrNT) and perfluorosulfonic acid (Nafion) was fabricated. The VRB operated with a composite (Nafion-ZrNT) membrane showed the improved ion-selectivity (ratio of proton conductivity to permeability), low self-discharge rate, high discharge capacity and high energy efficiency in comparison with a pristine commercial Nafion-117 membrane. The incorporation of zirconium oxide nanotubes in the Nafion matrix exhibits high proton conductivity (95.2 mS cm<SUP>−1</SUP>) and high oxidative stability (99.9%). The Nafion-ZrNT composite membrane exhibited low vanadium ion permeability (3.2 × 10<SUP>−9</SUP> cm<SUP>2</SUP> min<SUP>−1</SUP>) and superior ion selectivity (2.95 × 10<SUP>7</SUP> S min cm<SUP>−3</SUP>). The VRB constructed with a Nafion-ZrNT composite membrane has lower self-discharge rate maintaining an open-circuit voltage of 1.3 V for 330 h relative to a pristine Nafion membrane (29 h). The discharge capacity of Nafion-ZrNT membrane (987 mAh) was 3.5-times higher than Nafion-117 membrane (280 mAh) after 100 charge-discharge cycles. These superior properties resulted in higher coulombic and voltage efficiencies with Nafion-ZrNT membranes compared to VRB with Nafion-117 membrane at a 40 mA cm<SUP>−2</SUP> current density.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The Nafion-ZrNT composite membrane was successfully fabricated. </LI> <LI> Nafion-ZrNT membrane shows low vanadium-ion crossover thus superior ion selectivity. </LI> <LI> VRB showed low self-discharge rate for Nafion-ZrNT composite membrane than Nafion-117. </LI> <LI> Nafion-ZrNT exhibits high discharge capacity and efficiency compared with Nafion-117. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
State-of-the-art recent developments of large magnetorheological (MR) dampers: a review
Abdul Aziz Mohammad,Mohtasim Sakib Muhammad,Ahammed Rubel 한국유변학회 2022 Korea-Australia rheology journal Vol.34 No.2
Large MR (MR) dampers are popular due to their higher damping force capabilities which makes them suitable in the field of civil engineering, structural engineering, suspension bridge structure, mining engineering, and agricultural engineering applications. This paper presents a comprehensive review of large MR dampers. The classifications and applications of large MR dampers, the principle of operation, different fluid models, their structural design and control systems are classified and reviewed in this paper. The large MR dampers have higher damping force controllability than conventional MR dampers. The review indicates that the large MR dampers have enough vibration mitigation ability and higher damping performances.
Aziz, Md. Abdul,Jo, Kyungmin,Qaium, Md. Abdul,Huh, Chan-Hwa,Hong, In Seok,Yang, Haesik WILEY-VCH Verlag 2009 Electroanalysis Vol.21 No.19
<P>We report a versatile platform for highly sensitive alkaline phosphatase (ALP)-based electrochemical biosensors that uses an avidin-modified indium tin oxide (ITO) electrode as a sensing electrode and 1-naphthyl phosphate (NPP) as an ALP substrate. Almost no electrocatalytic activity of NPP and good electrocatalytic activity of 1-naphthol (ALP product) on the ITO electrodes allow a high signal-to-background ratio. The effective surface covering of avidin on the ITO electrodes allows very low levels of nonspecific binding of proteins to the sensing electrodes. The platform technology is used to detect mouse IgG with a detection limit of 1.0 pg/mL.</P>
Aziz, Md. Abdul,Selvaraju, Thangavelu,Yang, Haesik WILEY-VCH Verlag 2007 Electroanalysis Vol.19 No.14
<P>The electrochemical, selective determination of catechol (CT) in the presence of hydroquinone (HQ) is not readily achieved, because the formal potentials of two phenolic compounds are very close. Here, we have developed a simple electrochemical method for the selective determination of CT by using bare indium tin oxide electrodes and employing CT redox cycling by hydrazine. The cyclic voltammetry of CT and HQ was investigated in Tris buffer (pH 9.0), phosphate buffered saline buffer (pH 7.4), and acetate buffer (pH 4.5). Especially in Tris buffer, the anodic peak potential of CT is much lower than that of HQ, resulting in a large difference between two peak potentials (ca. 0.4 V). The difference allows the selective determination of CT in the presence of excess HQ. The anodic current of CT is amplified using CT redox cycling by hydrazine, which also helps to stabilize CT and HQ in Tris buffer for several hours. The detection limits of CT in Tris buffer containing 0.1 mM HQ are 1 μM and 10 μM in the presence and absence of hydrazine, respectively.</P>
( Abdul Rashid AZIZ ),( Patrick O. L. GOH ),( Kong Chuan TEH ) 한국스포츠정책과학원(구 한국스포츠개발원) 2006 International Journal of Applied Sports Sciences Vol.18 No.1
The mushroom fungus lingzhi (Ganoderma lucidum) has been used for centuries as a traditional health tonic in the Far East. One of its reputed effects, albeit still unproven, is the ability to improve human physical performance. The purpose of this study was to assess the potential ergogenic effects of thirty days of standardized lingzhi extract supplementation on exercise performance. The study adopted a randomized, double-blind, placebo-controlled experimental design. Nineteen players from the men`s national field-hockey team were randomly divided into the experimental (LIN, n = 10) and control (CON, n = 9) groups. All players completed tests for percentage body fat, maximal oxygen uptake, 30 s anaerobic Wingate cycling, and hand-grip strength, at pre- and post-thirty days of supplementation. Throughout the 30 days, the LIN group consumed 440 mg lingzhi extract (dose equivalent to 1.5 g dry fruiting body) daily while the CON group was given an equivalent placebo. All players underwent a similar centralized training programme during the intervention period. There were no significant differences in the physical and performance parameters between the two groups, either at the pre-and post-supplementation stages. In conclusion, chronic daily supplementation days of 440 mg lingzhi extract for thirty-days did not enhance training related gains in the aerobic, anaerobic and strength parameters in well-trained field-hockey players.
( Abdul Aziz Mohamed Yusoff ),( Fatin Najwa Zulfakhar ),( Siti Zulaikha Nashwa Mohd Khair ),( Wan Salihah Wan Abdullah ),( Jafri Malin Abdullah ),( Zamzuri Idris ) 대한뇌종양학회 대한신경종양학회 2018 Brain Tumor Research and Treatment Vol.6 No.1
Background Mitochondria are major cellular sources of reactive oxygen species (ROS) generation which can induce mitochondrial DNA damage and lead to carcinogenesis. The mitochondrial 10398A>G alteration in NADH-dehydrogenase subunit 3 (ND3) can severely impair complex I, a key component of ROS production in the mitochondrial electron transport chain. Alteration in ND3 10398A>G has been reported to be linked with diverse neurodegenerative disorders and cancers. The aim of this study was to find out the association of mitochondrial ND3 10398A>G alteration in brain tumor of Malaysian patients. Methods Brain tumor tissues and corresponding blood specimens were obtained from 45 patients. The ND3 10398A>G alteration at target codon 114 was detected using the PCR-RFLP analysis and later was confirmed by DNA sequencing. Results Twenty-six (57.8%) patients showed ND3 10398A>G mutation in their tumor specimens, in which 26.9% of these mutations were heterozygous mutations. ND3 10398A>G mutation was not significantly correlated with age, gender, and histological tumor grade, however was found more frequently in intra-axial than in extra-axial tumors (62.5% vs. 46.2%, p< 0.01). Conclusion For the first time, we have been able to describe the occurrence of ND3 10398A >G mutations in a Malaysian brain tumor population. It can be concluded that mitochondrial ND3 10398A>G alteration is frequently present in brain tumors among Malaysian population and it shows an impact on the intra-axial tumors.
Conceptual Design of Graph Routing Algorithm for WirelessHART
Abdul Aziz Memon,Joung-Han Lee,Seung-Ho Hong 대한전자공학회 2010 대한전자공학회 학술대회 Vol.2010 No.6
In this paper conceptual design of graph routing algorithm is proposed for WirelessHART protocol. This algorithm is used to generate not only minimum hop graphs for each individual field devices to assure minimum end to end communication delay and fulfill stringent real time requirements of process automation networks but also generated minimum hop graphs are reshaped to shift routing responsibility of field devices that have higher routing responsibility to field devices that have lower routing responsibility to increase overall network life.