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      저자 : K.S. Navaneethan (검색결과 2 건)
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        Unleashing the resilience of Reinforced Concrete Member retrofitted with composite laminates

        K.S. Navaneethan,S. Anandakumar,S. Manoj,P.C. Murugan 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.5

        This work presents experimental results on the performance of Aramid Fiber Reinforced Polymer (AFRP) laminates used inthe flexural retrofitting of full-scale reinforced concrete beams. The effects of variables including reinforcement placement,retrofitting orientation, and AFRP lifespan are examined. The experimental findings provide compelling evidence thatstructurally damaged beams can be retrofitted with AFRP composite material to restore their strength and stiffness. In mostcases, the retrofitted beams perform as well as, if not better than, the control beams. The efficiency of the AFRP strengtheningmethod in flexure, however, was found to vary with beam length. The examinations revealed that plate debonding was theleading cause of the failures observed. In order to overcome this difficulty, it is crucial to enhance the bonding processesbetween the AFRP laminates and the concrete substrate.

      • Growth, microstructure, structural and optical properties of PVP-capped CdS nanoflowers for efficient photocatalytic activity of Rhodamine B

        Ganesh, R. Sankar,Sharma, Sanjeev K.,Durgadevi, E.,Navaneethan, M.,Ponnusamy, S.,Muthamizhchelvan, C.,Hayakawa, Y.,Kim, Deuk Young Elsevier 2017 Materials research bulletin Vol.94 No.-

        <P><B>Abstract</B></P> <P>Size and structure tunability of polyvinyl pyrolidone (PVP) capped cadmium sulfide (PVP-capped CdS) flowers were synthesized by controlling the reaction time. XRD pattern indicated a phase transition from the cubic zinc blend to the hexagonal phase of CdS powder as the reaction time increased. As per the microstructure analysis with respect to the reaction time, the spherical nanoparticles were transformed in to the flower like morphology consisting of sword like nanorods and confirmed by the bright field images of TEM, while, HR-TEM images showed the uniform lattice spacing. UV-spectra exhibited a red shift due to the excitations of CdS nanoparticles. The near band edge (NBE) peak of PVP-capped CdS was completely diminished which indicated to sulphur vacancies on the surface of flowers. The photocatalytic activity of PVP-capped CdS flowers was detected the fast degradation of Rhodamine B (RhB) dye (95% for 120min) by irradiation of visible light.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Synthesis of un-capped and PVP-capped CdS microstructures by Hydrothermal. </LI> <LI> Growth of both the flower and dendrite microstructures controlled by the growth time. </LI> <LI> Phase transition of CdS from cubic zinc blend to hexagonal by the growth time. </LI> <LI> CdS flowers enhanced the photocatalytic performance of RhB under visible light. </LI> <LI> PVP-capped CdS showed the highest degradation of 95% of RhB within 120min. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

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