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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,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>
Aziz, Arif Abdul,Ginting, Lorenz,Setiawan, Dedi,Park, Je Hyeon,Tran, Nguyen Minh,Yeon, Gyu Yang,Kim, Dong In,Choi, Kae Won IEEE 2019 IEEE Internet of things journal Vol.6 No.5
<P>We propose a battery-less location tracking system that enables 3-D positioning of an Internet of Things (IoT) device powered by the radio frequency (RF) wireless power transfer (WPT). In the proposed system, a power beacon is equipped with a phased antenna array that has the dual purposes of high-efficiency WPT and phase-based accurate positioning. In order to enhance the efficiency of the RF WPT, we propose a beam focusing algorithm that dynamically controls the respective phases of antenna elements to place the focal point of the electro-magnetic (EM) wave onto the target IoT device. We also propose a phase-based positioning algorithm that requires only one multiantenna anchor point for determining the distance as well as the direction from the anchor point. We analyze the Cramer–Rao lower bound (CRLB) of the phase-based positioning with a single multiantenna anchor point, and show that the distance from the anchor point can be estimated as long as the IoT device lies within the radiative near-field region. We propose a joint location tracking and WPT algorithm that performs 3-D positioning and beam-focused WPT in a unified way. We have built a real-life testbed with a large-scale antenna array with 64 antenna elements for testing the proposed algorithm. The experimental results show the effectiveness of the proposed algorithm in a real environment.</P>
Aziz, Abdul,Kim, Kwang Soo Elsevier 2017 Journal of hazardous materials Vol.340 No.-
<P><B>Abstract</B></P> <P>In this work, the performance of benzene, toluene, ethylbenzene, and xylene (BTEX) removal and degradation from gas, air streams on UV pretreated Fe-ZSM-5 in a batch reactor at room temperature were studied. The Fe-ZSM-5 zeolite catalyst was prepared by hydrothermal reaction method. The influence of UV pre-irradiation time on the removal of BTEX were assessed by varying the time, ranging from 15min to 60smin. Then, sustainability of the activation of the catalyst resulted by UV pretreatment was studied by the four-cycle experiment with one time UV irradiation and after each cycle irradiation followed by BTEX removal after every cycle respectively. The results of BTEX removal depicted that 30min of UV pretreatment was sufficient for complete organics removal. The UV pretreatment effect on the catalytic oxidation and the stability of the catalyst were studied by modern instrumental techniques. The novelty of the process was the sustainable reuse of catalyst with persistent VOC removal, which works on the -adsorption-oxidation-regeneration-adsorption- cycle, which was confirmed by the characterization studies of the catalyst after four runs. The results revealed that the change in the structure, stability, morphology, and removal efficiency of the catalyst during the experiments was negligible. The VOC degradation mechanism studies showed that the oxidation occurs due to the formation of free radicals as well as hydroxyl ions, so named it heterogeneous photo-Fenton oxidation. The residual materials analysis showed the complete mineralization of VOC except small amount of acetone as oxidation product. Lastly, the kinetics of the VOC removal was studied.</P> <P><B>Highlights</B></P> <P> <UL> <LI> UV pretreatment of the catalyst activate the surface for oxidation of pollutants. </LI> <LI> Complete mineralization of VOC occurred followed by adsorption. </LI> <LI> we want to represent (.OH) as hydroxyl radical showing with free radical means one dot on the OH group OH and OH we want to present this OH group as Hydroxyl ion with negative charge (OH(-)) are main radicals responsible for the degradation of VOC. </LI> <LI> The heterogeneous photo-Fenton process is sustainable for multiple reuse of the catalyst. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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.
( Abdul Rashid Aziz ),( Teh Kong Chuan ) 한국스포츠정책과학원(구 한국스포츠개발원) 2004 International Journal of Applied Sports Sciences Vol.16 No.1
The 30 s Wingate cycling (cWG) test is a popular test of anaerobic capacity. The test is highly correlated with short, high-intensity performance but may have limitations when assessing intermittent-type activities. A reliable field-based test, the running Repeated Sprint Ability (rRSA) test, is deemed more sport-specific than cWG in determining anaerobic performance of multi-sprint sports athletes. This study examines the relationship of the performance indices of cWG and rRSA (8×40 m with 30 s rest in-between) tests in well-trained multi-sprint sports athletes. Twenty-six National-level male field hockey and soccer players took the cWG and rRSA tests on separate occasions in random order. There were only modest correlations between the cWGs mean power (relative) and rRSAs total sprinting time (r = -.46, p < .05) and between the two tests fatigue indicators (r = .46, p < .05). The findings of the low-shared variance among the performance variables between the two tests provided limited support for the use of the cWG for assessing the anaerobic performance capability of well-trained multi-sprint sport athletes.
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>