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Frontiers of Materials Science 2018年第3期12卷 247-263页

作者： M. Mohamed.Jaffer SAd.Q U. Sand.ya SHENOY d. krishna bhat d.partment of Chemistry National Institute of Technology Karnataka Surathkal Mangalore-575025 India d.partment of Chemistry College of Engineering and Technology Srinivas University Mukka Mangalore-574146 India

Novel barium tungstate/nitrogen-d.ped.red.ced.graphene oxid.-graphi- tic carbon nitrid. （BaWO4/NRGO-g-C3N4） nanocomposite has been synthesized.by a simple one-pot microwave technique. The synthesized.nanocomposites are well characterized.by d.ffraction, microscopic and.spectroscopic techniques to stud. its crystal structure, elemental composition, morphological features and.optical properties. The material prepared.is tested.for its performance as an electrocatalyst, photocatalyst and.red.ction catalyst. The nanocomposite catalyzed.the photod.grad.tion of methylene blue （MB） d.e in 120 min, red.ction of 4-nitro phenol （4-NP） to 4-amino phenol （4-AP） in 60 s, showed.an impressive Tafel slope of 62 mV/d.c for hyd.ogen evolution reaction （HER）. The observed.results suggest that the nanocomposite acts as an efficient multifunctional catalyst. The reported.approach provid.s fund.mental insights which can be extend.d.to other metal tungstate-based.ternary composites for applications in the field.of clean energy and.environment in the future.

关键词： BaWO4/NRGO-g-C3N4 nanocomposites microwave irrad.ation hyd.ogen evolution reaction photocatalyst red.ction

Constructing a biofunctionalized.3d.printed.gelatin/sod.um alginate/chitosan tri-polymer complex scaffold.with improvised.biological and.echanical properties for bone-tissue engineering

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Bio-d.sign and.Manufacturing 2024年第1期7卷 57-73页

作者： Amit Kumar Singh krishna Pramanik Amit Biswas Centre of Excellence in Tissue Engineering Department of Biotechnology and Medical EngineeringNational Institute of TechnologyRourkela 769008India

Sod.um alginate(SA)/chitosan(CH)polyelectrolyte scaffold.is a suitable substrate for tissue-engineering *** present stud. d.als with further improvement in the tensile strength and.biological properties of this type of scaffold.to make it a potential template for bone-tissue *** experimented.with ad.ing 0%–15%(volume fraction)gelatin(GE),a protein-based.biopolymer known to promote cell ad.esion,proliferation,and.*** resulting tri-polymer complex was used.as bioink to fabricate SA/CH/GEmatrices by three-d.mensional(3d.*** stud.es using scanning electron microscopy revealed.the microfibrous porous architecture of all the structures,which had.a pore size range of 383–419μm.X-ray d.ffraction and.Fourier-transform infrared.spectroscopy analyses revealed.the amorphous nature of the scaffold.and.the strong electrostatic interactions among the functional groups of the polymers,thereby forming polyelectrolyte complexes which were found.to improve mechanical properties and.structural *** scaffold. exhibited.a d.sirable d.grad.tion rate,controlled.swelling,and.hyd.ophilic characteristics which are favorable for bone-tissue *** tensile strength improved.from(386±15)to(693±15)kPa d.e to the increased.stiffness of SA/CH scaffold. upon ad.ition of *** enhanced.protein ad.orption and.in vitro bioactivity(forming an apatite layer)confirmed.the ability of the SA/CH/GE scaffold.to offer higher cellular ad.esion and.a bone-like environment to cells d.ring the process of tissue *** vitro biological evaluation includ.ng the MTT assay,confocal microscopy analysis,and.alizarin red.S assay showed.a significant increase in cell attachment,cell viability,and.cell proliferation,which further improved.biomineralization over the scaffold.*** ad.ition,SA/CH containing 15%gelatin d.signated.as SA/CH/GE15 showed.superior performance to the other fabricated.3d.structures,d.monstrating its pote

关键词： Scaffold Biomaterial Sod.um alginate Chitosan Gelatin 3d.printing Tissue engineering

d.sign and.Robustness Analysis of a Wave-Based.Controller for Tethered.Towing of d.funct Satellites

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IEEE/CAA Journal of Automatica Sinica 2023年第1期10卷 278-280页

作者： Rui Qi Yang Zhang krishna d.Kumar the School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China IEEE the d.partment of Aerospace Engineering Ryerson UniversityToronto M5B 2K3Canada

d.ar Ed.tor, A microgravity environment in space, the elasticity of the tether,and.complex flexible append.ges make the tethered.towing system a nonlinear and.und.ractuated.system, which is sensitive and.d.fficult to stabilize. This letter d.velops a controller based.on wave propagation for tethered.towing of d.funct satellites, and.carries out a robustness analysis of the controller via numerical simulation.

关键词： system elasticity letter

Facile solvothermal synthesis of NiFe2O4 nanoparticles for high-performance supercapacitor applications

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Frontiers of Materials Science 2020年第2期14卷 120-132页

作者： Meenaketan SETHI U.Sand.ya SHENOY Selvakumar MUTHU d.krishna bhat d.partment of Chemistry National Institute of Technology KarmatakaSurathkalMangalore-575025India d.partment of Chemistry College of Engineering and TechnologySrinivas UniversityMukka-574146KarmatakaIndia d.partment of Chemistry Manipal Institute of TechnologyManipal-576104KarnatakaIndia

We report a green and.facile approach for the synthesis of NiFe2O4(NF)nanoparticles with good.*** prepared.materials are stud.ed.by various techniques in ord.r to know their phase structure,crystallinity,morphology and.elemental *** BET analysis revealed.a high surface area of 80.0 m^2·g^-1 for NF possessing a high pore volume of 0.54 cm^3·g^-1,also contributing to the amelioration of the electrochemical *** NF sample is stud.ed.for its application in supercapacitors in an aqueous 2 mol·L^-1 KOH *** properties are stud.ed.both in the three-electrod. method.and.in a symmetrical supercapacitor *** show a high specific capacitance of 478.0 F·g^-1 from the CV curve at an applied.scan rate of 5 mV·s^-1 and.368.0 F·g^-1 from the GCd.analysis at a current d.nsity of 1A·g^-1 for the NF ***,the material exhibited.an 88%retention of its specific capacitance after continuous 10000 cycles at a higher applied.current d.nsity of8 A·g^-*** encouraging properties of NF nanoparticles suggest the practical applicability in high-performance supercapacitors.

关键词： NiFe2O4 nanoparticle solvothermal method BET surface area specific capacitance supercapacitor

One-d.mensional numerical investigation on multicylind.r gasoline engine fueled.by micro-emulsions,CNG,and.hyd.ogen in d.al fuel mod.

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Chinese Journal of Aeronautics 2023年第5期36卷 57-65页

作者： Ufaith QAd.RI d.SIVA krishna REd.Y Amjad.ALI PASHA Mohammad.IRFAN ALAM d.partment of Mechanical Engineering Sreenidhi UniversityYamnampetGhatkesar Hyderabad 501301India School of Mechanical Engineering SRM Institute of Science and TechnologyKattankulathurChennai 603203India Aerospace Engineering d.partment King Abdulaziz UniversityJeddah 21589Saudi Arabia d.partment of Aerospace Engineering VIT Bhopal UniversitySehore 466665India

This research work is the novel state-of-the-art technology performed.on multi-cylind.r SI engine fueled.compressed.natural gas,emulsified.fuel,and.hyd.ogen as d.al *** work pred.cts the overall features of performance,combustion,and.exhaust emissions of ind.vid.al fuels based.on AVL Boost simulation *** types of alternative fuels have been compared.and.*** results show that hyd.ogen prod.ces 20%more brake power than CNG and.25%more power than micro-emulsion fuel at 1500 r/min,which further increases the brake power of hyd.ogen,CNG,and.micro-emulsions in the range of 25%,20%,and.15%at higher engine speed. of 2500-4000 r/min,*** ad.ition,the brake-specific fuel consumption is the lowest for 100%hyd.ogen,followed.by CNG 100%and.then micro-emulsions at 1500 r/*** 2500-5000 r/min,there is a significant d.op in brake-specific fuel consumption d.e to a lean mixture at higher engine *** CO,HC,and.NOx emissions significantly improve for hyd.ogen,CNG,and.micro-emulsion *** fuel shows zero CO and.HC emissions and.is the main objective of this research to prod.ce 0%carbon-based.emissions with a slight increase in NOx emissions,and.CNG shows 30%lower CO emissions than micro-emulsions and.21.5%less hyd.ocarbon emissions than micro-emulsion fuel at stoichiometric air/fuel ratio.

关键词： CNG Emissions Hyd.ogen Ignition Micro-emulsions Performance

Tribological Properties of A356.2/RHA Composites

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Journal of Materials Science & Technology 2012年第4期28卷 367-372页

作者： d. Siva Prasad.A. Rama krishna d.partment of Mechanical Engineering GITAM University Visakhapatnam Andhra Pradesh India d.partment of Mechanical Engineering ANDHRA University Visakhapatnam Andhra Pradesh India

Rice husk ash （RHA） is one of the ind.strial waste byprod.ct available abund.ntly in the world. In the present work, an attempt is mad. to incorporate the RHA particles in the molten aluminum A356,2 alloy. The RHA particles were ad.ed.into the matrix melt by creating a vortex with the help of a mechanical stirrer and.the melt temperature was maintained.between 800 and.850 ℃. d.y slid.ng wear experiments were performed.in a pin on d.sc wear equipment against a chromium steel d.sc at 30 ℃. Scanning electron microscopy is used.to stud. the wear characteristics of the unreinforced.AI alloy and.the A356.2/RHA composites. From the experiments it is observed.that the composites exhibit higher hard.ess and.resistance to wear as compared.to unreinforced.AI alloy,

关键词： Rice husk ash A356.2 Aluminum alloy Wear

Fabrication and.Characterisation of Rutile-TiO_2 Coatings on Metallic Alloy Substrates

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材料热处理学报 2004年第5B期25卷 862-865页

作者： d. Siva Rama krishna School of Materials Engineering Nanyang Technological University Singapore 639798

In the present work, attempts have been mad. to extend.the use of the tribological and.chemical properties of rutile-TiO2 to metallic alloy systems, by forming a rutile coating on the metallic substrates. Two metallic alloys were selected.in this stud., includ.ng AISI316L austenitic stainless steel and.aluminium alloy. The rutile-based.coatings were fabricated.by magnetron sputter d.position of a pure titanium coating first, and.then thermal oxid.tion of the coated.specimens to partially convert the titanium coating to rutile oxid. and.to promote interfacial reactions which can significantly enhance the coating-substrate ad.esion strength. The structures and.properties of the coating-substrate systems were characterized.by a variety of analytical and.experimental techniques, includ.ng X-ray d.ffraction, glow d.scharge spectrometry, high resolution SEM, nanoind.ntation, microscratch, friction and.wear testing, as well as electrochemical testing. The results show that the friction and.wear properties, as well as the corrosion resistance of the metallic alloys can be significant enhanced.by surface engineering with rutile-TiO2.

关键词：金红石二氧化钛不锈钢磨损性能耐蚀性

Optimized.Mn and.Bi co-d.ping in SnTe based.thermoelectric material:A case of band.engineering and.d.nsity of states tuning

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Journal of Materials Science & Technology 2021年第26期85卷 76-86页

作者： Samuel Kimani Kihoi Joseph Ngugi Kahiu Hyunji Kim U.Sand.ya Shenoy d.krishna bhat Seonghoon Yi Ho Seong Lee School of Materials Science and.Engineering Kyungpook National University80 Daehak-roBuk-guDaegu 41566Republic of Korea d.partment of Hyd.ogen and.Renewable Energy Kyungpook National University80 Daehak-roBuk-guDaegu 41566Republic of Korea d.partment of Chemistry College of Engineering and TechnologySrinivas UniversityMukka574146 MangaloreKarnatakaIndia d.partment of Chemistry National Institute of Technology KarnatakaSurathkalSrinivasnagar575025 MangaloreKarnatakaIndia

Tin tellurid.(SnTe)overwhelmingly continues to be stud.ed.owing to its promising thermoelectric properties,tunable electronic structure,and.its potential as an alternate to toxic lead.tellurid.(PbTe)based.*** this research,we engineer the electronic properties of SnTe by co-d.ping Mn and.Bi below their ind.vid.al solubility *** First principles d.nsity functio nal theory stud.es reveal that both Bi and.Mn introd.ce resonance states,thereby increasing the d.nsity of states near the Fermi level lead.ng to enhanced.Seebeck *** unique combination of using two resonant d.pants to introd.ce flatter band. is effective in achieving higher performance at lower tempe ratures manifesting into a large Seebeck value of~91μV/K at room temperature in the present *** elements optimally co-d.ped.results in a very high power factor value of~24.3μW/cmK^(2) at 773 K when compared.to other high performance SnTe based.materials.A zT of~0.93 at 773 K is achieved.by tuning the proportion of the co-d.pants Mn and.Bi in *** hard.ess value of pristine SnTe was also seen to increase after *** a result,synergistic optimized.d.ping proves to be a suitable means for obtaining thermoelectric materials of superior characteristics without the need.for heavy d.ping.

关键词： SnTe Thermoelectric Electronic structure engineering Solubility Thermal cond.ctivity

Mid.infrared.quasi-BIC resonances with sub-wavelength slot mod. profiles in germanium-based.coupled.guid.d.mod. resonance structures

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Photonics Research 2022年第1期10卷 68-75页

作者： A.S.LAL krishna SRUTI MENON ASISH PROSAd.VARUN RAGHUNATHAN d.partment of Electrical Communication Engineering Indian Institute of ScienceBangalore 560012India

We experimentally d.monstrate a novel quasi-bound.state in the continuum(BIC) resonance in the mid.infrared.wavelength region with the resonant electric field.confined.as a slot mod. within a low-refractive-ind.x med.um sand.iched.between high-ind.x *** structures stud.ed.here comprise coupled.amorphous germanium guid.d.mod. resonance(GMR) structures with a top one-d.mensional grating layer and.bottom uniform layer separated.by a low-ind.x silicon nitrid. *** slot-mod. profile within the silicon nitrid. layer with mod. field.confinement >30% is achieved.as a solution to the electromagnetic wave propagation through the coupled.GMR structure with the d.minant field.component being perpend.cular to the *** quasi-BIC resonance in symmetric 1d.grating structures can be observed.even at normal incid.nce when consid.ring a realistic excitation beam with finite angular *** measured.transmission peak is found.to red.hift(remain almost unchanged.und.r classical(full-conical) mounting *** highest quality factor of ~400 is experimentally extracted.at normal incid.nce und.r a classical mounting cond.tion with a resonance peak at 3.41 μm *** slot-mod. GMR structures with appropriately chosen low-ind.x intermed.ate layers can find.applications in resonantly enhanced.sensing and.active photonic d.vices.

关键词： mod. resonance resonant

Persuasive factors on the bioink printability and.cell viability in the extrusion-based.3d.bioprinting for tissue regeneration applications

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Engineered.Regeneration 2023年第4期4卷 396-410页

作者： d.vara Venkata krishna Mamilla Ravi Sankar d.partment of Mechanical Engineering Indian Institute of TechnologyTirupatiAndhra Pradesh 517619India

The extrusion-based.bioprinting(EBBP)applications in the med.cal field.tremend.usly increase d.e to its ver-satility in fabricating intricate geometry components with reasonable accuracy and.*** bioink and.its properties for an EBBP process are crucial in manufacturing parts with significant biocompatibility and.*** EBBP d.mand. optimized.parameters for obtaining good.printability and.cell viability.A better und.rstand.ng of the various process parameters is essential for the researcher to optimize the mechanical and.biological properties of the printed.*** biological,mechanical,and.rheological parameters all together need.to be evaluated.to enhance the printability of *** article concisely d.lineates the effect of the rheological and.physiochemical parameters on the biological and.mechanical properties of the printed.*** printing parameters and.nozzle geometry,which consid.rably influence the printability,and.shape fid.lity of the bioprinted.scaffold. are exemplified.in ***,the challenges and.future aspects of enhancing printability are d.scussed.succinctly.

关键词： Bioprinting Printability Hyd.ogels Crosslinking