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Effect of Plasma Power on Corrosion Behaviour of Plasma Sprayed Hydroxyapatite Coatings
Swarnima Singh,Krishna Kant Pandey,Anup Kumar Keshri 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.11
Hydroxyapatite coating have been deposited on titanium alloys (Ti–6Al–4V) substrate by varying plasma power from 20to 35 kW using atmospheric plasma spraying. Effect of plasma power variation on the microstructure as well as corrosionbehaviour of the coatings has studied exhaustibly in simulated body fluid (SBF). Microstructural analysis revealed thatincreasing the plasma power from 20 to 35 kW has led to a more densified coating by minimizing the level of porosity andpartially melted region as well. This enhanced property is attributed to the higher velocity of the in-flight particles withtheir shorter residence time at 35 kW. The molten particles strike the substrate without losing much of its energy during itsflight, which further boosted the closed packing of the coating layers ensuing a reduced inter-splat region. These improvedmicrostructural properties also escorted to enhancement in corrosion resistance with increase in the plasma power. Thisenhancement in corrosion behaviour at higher power is attributed to reduction in pores and voids in the coatings whichhindered the penetration of SBF solution into the coatings.
Clinical and Social Outcomes of Cochlear Implantation in Older Prelinguals
Tyagi Pragya,Chauhan Divya,Singh Anup,Bhutada Mayank,Sikka Kapil,Chaudhary Tanvi,Sharma Sonam,Agarwal Shivani,Verma Hitesh,Sagar Prem,Kumar Rakesh,Thakar Alok 대한청각학회 2023 Journal of Audiology & Otology Vol.27 No.2
Background and Objectives: Cochlear implantation in late implanted prelinguals necessitates a complex decision-making process for clinicians and patients due to the uncertainty of achieving adequate benefit in auditory and speech perception. This study longitudinally evaluated clinical and social outcomes of prelingually deaf children with implantation in their late childhood.Subjects and Methods: A total of 113 (49 females and 64 males) participants, with an age range of 5-15 years, were assessed for the pre-implant parameters such as hearing loss etiology, aided responses, anatomical aspects, and psychological evaluation. The Category of Auditory Performance, Speech Awareness Threshold, Speech Reception Threshold, and Speech Discrimination Score were administered to assess the patient’s auditory skills. Further, the Speech Intelligibility Rating scale was administered to evaluate the patient’s speech intelligibility at 3, 6, 9, 12, 18, and 24 months post-surgery. Subjectively perceived benefits were evaluated using the satisfaction rating scale and a questionnaire.Results: The statistical results showed a significant impact of cochlear implantation in all domains. Positive impact and improvement post-implantation were noted in all the spheres, including auditory, linguistic, social, and educational.Conclusions: The study highlighted that the outcomes of a cochlear implant at a later age might not parallel with the implantation at a younger age. However, this still provides measurable benefits even after a longer period of auditory deprivation.
Highly Efficient Photocatalytic Studies on Bi36 Fe2 O57 Ceramic Synthesized by Chemical Route
Manish Kumar Verma,Vinod Kumar,Upakar Patel,Vishnu Shankar Rai,Anup Kumar,Arup Kumar De,Aditya Kumar Prajapati,Dinesh Prajapati,Kedar Sahoo,Tapas Das,N. B. Singh,K. D. Mandal 한국전기전자재료학회 2023 Transactions on Electrical and Electronic Material Vol.24 No.5
Bi36 Fe2 O57 (BFO) polycrystalline ceramic was synthesized by economical chemical route. The single-phase formation of BFO ceramic was confirmed by powder X-ray diffraction studies. Nanosized formation of BFO ceramics established by XRD and TEM analysis. The bimodal distribution of grain size is observed with size ranging from 50 to 600 nm. It observed that the Bi36 Fe2 O57 photocatalyst exhibited higher catalytic activity for the degradation of Methylene Blue (MB) under visible-light irradiation The oxidation state of elements present in the BFO ceramic, was confirmed by XPS studies. The pseudocapacitive nature of BFO ceramic was observed by cyclic Voltammetry. The dielectric constant of BFO ceramic was found 375 at 1 kHz at 300 K. The dielectric loss was found 0.51 at 100 kHz and 300 K.