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Abhinaba Roy,Narendranath S.,Alokesh Pramanik 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.10
This study considers the effect of wire electro discharge machining (WEDM) parameter peak current (I p ) and pulse peak voltage (V p ) on the machined surface morphology of TiNiCu shape memory alloys. Various defects of machined surfaces were identified and correlated with parameter values and measured average surface roughness (R a ) and average surface depth (R z ). It was found that the nature of the machined surface is highly influenced by the nature of sparking, which is dictated by levels of peak current and peak voltage used during machining. Distinctions between machining parameters resulting in "rough-cut" and "trim-cut" machining are reported along with deviations in output responses, which counters the trend reported in the literature.
Effect of grain refinement on the performance of AZ80 Mg alloys during wear and corrosion
Naik, Gajanan M,Gote, Gopal D.,Narendranath, S,Kumar, S.S. Satheesh Techno-Press 2018 Advances in materials research Vol.7 No.2
Magnesium and its alloys are attracted towards all engineering applications like automotive, marine, aerospace etc. due to its inherent high strength to weight ratio. But, extensive use of Mg alloys is limited to the current scenario because of low wear and corrosion resistance behavior. However, equal channel angular press is one of the severe plastic deformation technique which has been effective method to improve the wear and corrosion resistance by achieving fine grain structure. In this study, the effect of grain refinement on wear and corrosion resistance of AZ80 Mg alloys were investigated. The wear behavior of the coarse and fine-grained Mg alloys was examined through $L_9$ orthogonal array experiments in order to comprehend the wear behavior under varies control parameters. It was shown that ECAPed alloy increased the wear and corrosion resistance of the Mg alloy through the formation of fine grain and uniform distribution of secondary ${\beta}-phase$. Also, the performance of AZ80 Mg alloy for these changeswas discussed through SEM morphology.
Experimental investigation on R-phase Evolution in near-Equiatomic Nitinol
푸어네시(Poornesh Kumar Koorata),나렌드라(Narendranath S),조종두(Chongdu Cho) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Single-step and multiple step transformation in near-equiatomic shape memory alloy have been much discussed in the recent literatures. In our present experimental work, single step transformation is obtained by solid solution treatment at 800℃ for 60 min and water quenched to room temperature. It is well known that complex multiple transformation behaviour will be obtained during ageing and coherent precipitates which develop during ageing are made responsible for the intermediate phases. Martensitic detwinning and R-phase evolution have been explained with the help of quasi-static tensile test based on macroscopic observations. Effect of ageing temperature on phase transformation and martensitic detwinning has been investigated.
A study on novel coupled membrane bioreactor with electro oxidation for biofouling reduction
Kamalakannan Vasanthapalaniapp,Kavitha Palani,Shanmuga Sundar Saravanabhavan,Narendranath Jonna,Maharaja Pounsamy,Kannan Natarajan,Yun Suk Huh,Balasubramanian Natesan 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.4
Lead is the most globally bountiful harmful substantial component in nature. Its utilization can be followed to verifiable occasions. The current work archives the combination, portrayal, and utilization of bentonite/chitosan/NiFe₂O₄ ternary novel nanocomposite. Nanostructured nickel ferrite was joined with chitosan and bentonite to frame a novel ternary nanocomposite. The nanocomposite was portrayed by FT-IR, powder XRD, VSM, and TEM investigation. All the logical outcomes affirm the fruitful arrangement of ternary composite. The as-blended nanomaterial was applied as nanoadsorbent for the evacuation of lead (II) from water. The ideal composite portion was 50㎎/100㎖ was seen as profoundly powerful for the evacuation of 82% Pb (II) particles from 200 ppm watery arrangement. This ferromagnetic, minimal effort, the eco-accommodating nanocomposite may end up being helpful for the expulsion of lead from watery arrangement at the mechanical level.
Muruganantham Rethinasabapathy,강성민,Yuvaraj Haldorai,Narendranath Jonna,Manokaran Jankiraman,이고운,장성찬,Balasubramanian Natesan,노창현,허윤석 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.69 No.-
N-doped graphene supported quaternary electrocatalyst (PtRuFeCo/NG) was synthesized and evaluated for potential oxygen reduction (ORR) and methanol oxidation reaction (MOR) in fuel cells. The catalyst exhibited excellent MOR (strong CO tolerance, lower onset potential), ORR (four electron transfer) activities and delivered maximum power densities of 778 and 122 mW cm−2 with direct methanol and proton exchange membrane fuel cells, respectively. The N-doping and synergistic effects of alloying low-cost Fe and Co with Pt and Ru makes PtRuFeCo/NG as excellent bifunctional catalyst that greatly reduces the processing cost of fuel cell which is the major problem facing the fuel cell industry.
Rethinasabapathy, Muruganantham,Kang, Sung-Min,Haldorai, Yuvaraj,Jonna, Narendranath,Jankiraman, Manokaran,Lee, Go-Woon,Jang, Sung-Chan,Natesan, Balasubramanian,Roh, Changhyun,Huh, Yun Suk Elsevier 2019 Journal of industrial and engineering chemistry Vol.69 No.-
<P><B>Abstract</B></P> <P>N-doped graphene supported quaternary electrocatalyst (PtRuFeCo/NG) was synthesized and evaluated for potential oxygen reduction (ORR) and methanol oxidation reaction (MOR) in fuel cells. The catalyst exhibited excellent MOR (strong CO tolerance, lower onset potential), ORR (four electron transfer) activities and delivered maximum power densities of 778 and 122mWcm<SUP>−2</SUP> with direct methanol and proton exchange membrane fuel cells, respectively. The N-doping and synergistic effects of alloying low-cost Fe and Co with Pt and Ru makes PtRuFeCo/NG as excellent bifunctional catalyst that greatly reduces the processing cost of fuel cell which is the major problem facing the fuel cell industry.</P> <P><B>Highlights</B></P> <P> <UL> <LI> First time, a quaternary catalyst is tested as bifunctional catalyst using NG as support. </LI> <LI> Exhibit higher ECSA (91m<SUP>2</SUP> g<SUP>−1</SUP>) and strong tolerance towards CO poisoning. </LI> <LI> Two to three-fold increase in MOR activity than other multi-metallic catalysts. </LI> <LI> Facilitate 4 electron transfer with high current in ORR (6.3mAcm<SUP>−2</SUP>). </LI> <LI> Greatly reduce the cost of the catalyst due to less Pt usage and addition of Fe and Co. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>