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Shaji, Nitheesha,Santhoshkumar, P.,Nanthagopal, Murugan,Senthil, Chenrayan,Lee, Chang Woo Elsevier 2019 APPLIED SURFACE SCIENCE - Vol.491 No.-
<P><B>Abstract</B></P> <P>The performance of existing lithium-ion batteries (LIBs) is greatly hindered by the low specific capacity of graphite-based anodes (372 mAh g<SUP>−1</SUP>). Therefore, development of suitable anode materials that exhibit higher and stable capacity is necessary to improve performance. Transition metal oxides have attracted tremendous attention as next-generation anode materials for LIBs due to their high theoretical capacity. Herein, we report the synthesis of a porous CaFe<SUB>2</SUB>O<SUB>4</SUB> by a facile and time efficient solution combustion synthesis technique for use in an anode for LIBs. The as-prepared material exhibited improved electrochemical performance with specific discharge capacities of 441 mAh g<SUP>−1</SUP>, 518 mAh g<SUP>−1</SUP>, and 516 mAh g<SUP>−1</SUP> for the initial three cycles. It achieved stability with a deliverable specific discharge capacity of 551 mAh g<SUP>−1</SUP> after 150 cycles at a current density of 200 mA g<SUP>−1</SUP>. The porous CaFe<SUB>2</SUB>O<SUB>4</SUB> exhibits improved cyclic performance and rate capability. These improvements are attributed to the porous nature of active material and, more importantly, the presence of CaO, which effectively alleviates the volume changes by acting as a buffer matrix.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Porous CaFe<SUB>2</SUB>O<SUB>4</SUB> has been synthesized by a facile solution combustion synthesis technique. </LI> <LI> Mixed-metal oxides possessing electrochemically active-inactive constituents are reported. </LI> <LI> The porous CaFe<SUB>2</SUB>O<SUB>4</SUB> as an anode for LIBs exhibited improved electrochemical performances. </LI> <LI> The porous structure and the buffer matrices of CaO are owed for their improved activity. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Some congruence properties for -regular partitions, where l ∈ {4, 8, 13, 17, 19, 25, 40, 55}
P. Murugan,V. S. Veena,S. N. Fathima 장전수학회 2023 Proceedings of the Jangjeon mathematical society Vol.26 No.2
Some congruence properties for -regular partitions, where l ∈ {4, 8, 13, 17, 19, 25, 40, 55}
Murugan, S. P.,Cheepu, M.,Nam, D. G.,Park, Y. D. Springer Science + Business Media 2017 Transactions of the Indian Institute of Metals Vol.70 No.3
<P>This paper focuses on the resistance spot welding of low carbon steel/aluminium/stainless steel 3-ply clad sheet. Weldability, microstructure, tensile properties and fracture behaviour of the clad sheet with resistance spot welding were evaluated. A 'squeeze-out pulse' was used to melt and squeeze out the core aluminium completely from the vicinity of the weld zone before the application of actual welding current. This enabled the clad sheet to be welded without the formation of any Fe-Al intermetallic compound layer in the weld zone. The fracture mode associated with the peel test of the spot weld was used as the criterion for resistance spot weldability evaluation of the clad sheet. A weldability lobe diagram in the welding current-welding time space based on the fracture mode was constructed and it revealed a wide weldable window especially at a welding time of 18 cy. A tensile shear test with a cross head speed of 1 mm/min was conducted to study the tensile strength and fracture behaviour. It revealed four different fracture modes namely button pull, clad-bond fracture, partial thickness-partial clad-bond fracture and interfacial fracture. The nugget size and melting of clad interface and stainless steel layer were the dominant factors in determining the fracture mode.</P>
S.P. Ratnayake,C. Sandaruwan,M.M.M.G.P.G. Mantilaka,N. de Silva,D. Dahanayake,U.K Wanninayake,W.R.L.N. Bandara,S. Santhoshkumar,E. Murugan,G.A.J.Amaratunga,K.M. Nalin de Silva 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.95 No.-
A unique zirconia nanomorphology possessing an enhanced photocatalytic efficiency was developedutilizing a convenient single-sol synthesis process which involved in-situ doping of zirconia by boron. The boron-doped zirconia exhibited aflake morphology as opposed to the spherical pure form andsubsequent crystallographic investigations implied the phase conversion from binary to single-phasealong with the shape due to the doping. Optical characterization indicated a modified band structurewith newly generated isolated impurity states within the principle zirconia band edges. As per the X-rayspectroscopy data, boron was detected as chemically bound to oxygen while electron paramagneticresonance indicated the presence of an adsorbed oxygen lattice. During UV and simulated solarirradiation trials, respective removal capabilities of 90% and 93% of the model compound wereaccomplished, hence the effectiveness of the photocatalyst was confirmed. The enhanced photoactivityobserved in the UV region was attributed to combined effects of the boron-induced isolated impuritystates within principle band edges of zirconia, the defect-rich planer morphology, favorable interfacialinteractions and the greater availability of oxygen on the lattice. Developed nanoflakes are stable, inert,and efficient hence exhibiting compelling suitability in the remediation of harmful industrial organiccompounds.
Fibre Rupture Phenomenon in Rotor Spinning
Murugan, R.,Dasaradan, B.S.,Karnan, P.,Senthilkannan, M. Subramanian The Korean Fiber Society 2007 Fibers and polymers Vol.8 No.6
The present work relates to the occurrence of fibre rupture during fibre separation in rotor spinning and also discusses the mechanism of such rupture. The reduction in fibre length during opening has been studied at different span lengths. A correlation has been drawn showing the influence of combing roller action on yam tenacity and elongation. Fibre rupture has direct relationship with opening roller speed. Fibre rupture and surface damage occurring due to action of opening roller together are found to mar the yarn quality index.
Murugan, S.,Umayal, S.P. The Korean Institute of Electrical Engineers 2014 Journal of Electrical Engineering & Technology Vol.9 No.6
Linearization of transducer characteristic plays a vital role in electronic instrumentation because all transducers have outputs nonlinearly related to the physical variables they sense. If the transducer output is nonlinear, it will produce a whole assortment of problems. Transducers rarely possess a perfectly linear transfer characteristic, but always have some degree of non-linearity over their range of operation. Attempts have been made by many researchers to increase the range of linearity of transducers. This paper presents a method to compensate nonlinearity of Linear Variable Displacement Transducer (LVDT) based on Extreme Learning Machine (ELM) method, Differential Evolution (DE) algorithm and Artificial Neural Network (ANN) trained by Genetic Algorithm (GA). Because of the mechanism structure, LVDT often exhibit inherent nonlinear input-output characteristics. The best approximation capability of optimized ANN technique is beneficial to this. The use of this proposed method is demonstrated through computer simulation with the experimental data of two different LVDTs. The results reveal that the proposed method compensated the presence of nonlinearity in the displacement transducer with very low training time, lowest Mean Square Error (MSE) value and better linearity. This research work involves less computational complexity and it behaves a good performance for nonlinearity compensation for LVDT and has good application prospect.
Establishment of Structural Similitude for Elastic Models and Validation of Scaling Laws
Murugan Ramu,V. Prabhu Raja,P. R. Thyla 대한토목학회 2013 KSCE JOURNAL OF CIVIL ENGINEERING Vol.17 No.1
Scaled down models are widely used for experimental investigations on huge structures due to the limitation in the capacities of testing facilities, and, moreover, the experimentation on scaled models is less expensive. Also small scale models are often built with materials dissimilar to those of the prototype. However, only few studies have been carried out on the similitude laws for the prototype structures with small scale models built with a different material. In the present study, an attempt has been made to develop a scaling law for models to carry out the free vibration analysis of structures, based on the similitude requirement. The established scaling laws are validated analytically using simple test problems. The similitude relationship between the prototype and the model is validated with the aid of a case study using finite element analysis software.
S. Nagini,P. Manikandan,R. Senthil Murugan,H. Abbas,S.K. Abraham 한국식품영양과학회 2007 Journal of medicinal food Vol.10 No.3
The present study was designed to evaluate the protective effects of ethanolic Ocimum sanctumleaf extractagainst 7,12-dimethylbenz[a]anthracene (DMBA)-induced genotoxicity, oxidative stress, and imbalance in xenobiotic-metab-olizing enzymes. Four different concentrations of ethanolic O. sanctumleaf extract (100, 200, 300, and 400 mg/kg of bodyweight) were administered to Wistar rats by intragastric intubation for five consecutive days followed by intraperitoneal in-jection of DMBA (35 mg/kg of body weight) 90 minutes after the final dose of the extract. Administration of DMBA in-creased bone marrow micronuclei, phase I enzymes, lipid peroxidation, and protein carbonyl formation. This was accompa-nied by a significant decrease in the activities of phase II detoxification enzymes and antioxidants in the liver, erythrocytes,and bone marrow. Pretreatment with ethanolic O. sanctumleaf extract at a concentration of 300 mg/kg of body weight sig-nificantly reduced micronuclei formation and phase I enzymes as well as lipid and protein oxidation with enhanced antioxi-dant and phase II enzyme activities. The results of the present study suggest that ethanolic O. sanctumleaf extract inhibitsDMBA-induced genotoxicity and oxidative stress by modulating xenobiotic-metabolizing enzymes, reducing the extent oflipid and protein oxidation and up-regulating antioxidant defenses.