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Journal of Magnesium and Alloys 2019年第1期7卷 134-143页

作者： Nagaraj M.Chelliah Pambannan Padaikathan Ram Kumar department of Metallurgical engineering PSG College of TechnologyCoimbatore 641004Tamil NaduIndia department of materials engineering Indian Institute of ScienceBangalore 560012KarnatakaIndia department of Mechanical engineering Indian Institute of TechnologyRupnagar 140001PunjabIndia

The present study aims at understanding the electrochemical impedance and biocorrosion characteristics of AZ91 Mg-alloy in Ringer’s ***-cast AZ91 Mg-alloy was subjected to T4 heat treatment in a way to homogenize its microstructure by dissolving most of theβ-Mg 17 Al 12 phase at the vicinity of grain *** electrochemical impedance and biocorrosion performances of these two different microstructures(as-cast and T4 heat treated AZ91 Mg-alloys)in Ringer solution were evaluated by electrochemical impendence spectroscopy,potentiodynamic polarization and weight loss *** spectra showed that both microstructures exhibit similar dynamic response as a function of the immersion time;however,the value of impedance and maximum phase angle are about 50%higher in as-cast AZ91 Mg-alloy as compared to that of homogenized AZ91 *** loss measurement indicated that corrosion resistance of as-cast AZ91 was significantly better than that of homogenized *** and XRD analysis revealed that as-cast AZ91 contains a passive film of MgCO_(3)and CaCO_(3)precipitates with near spherical morphologies,whereas homogenized AZ91 comprised mainly unstable Mg(OH)_(2)film featured by irregular plate-like morphologies.

关键词： Mg-alloys Ringers solution Homogenization Corrosion Electrochemical impedance Spectroscopy(EIS) Weight loss

Structural and Optical Properties of Graphene Oxide Prepared by Modified Hummers’Method

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Computers, materials & Continua 2016年第6期52卷 175-185页

作者： N.Selvakumar Uday Pradhan S.B.Krupanidhi Harish C.Barshilia Nanomaterials Research Lab Surface Engineering DivisionCSIR-National Aerospace LaboratoriesBangalore-560017India materials Research Center Indian Institute of ScienceBangalore-560012India

Graphene oxide was synthesized from graphite flakes using modified Hummers’*** interlayer spacings of graphite,graphite oxide and graphene oxide were measured using X-ray diffraction *** C/O atomic ratios of graphite oxide and graphene oxide were calculated from XPS *** transformation of graphite to graphite oxide and finally to graphene oxide was clearly observed from the micro-Raman spectroscopy data and was confirmed from the FESEM ***-VIS-NIR spectrophotometer was used to study the absorbance of graphene oxide and reduced graphene oxide ***,the chemically reduced graphene oxide was heat-treated in air to obtain chemically modified graphene.

关键词： Graphene oxide Graphite,modified Hummers’method thermal annealing optical properties

A novel approach towards molecular memory device in gate tunable structure of MoS_(2)-graphene

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Nano Research 2021年第1期14卷 177-184页

作者： Rahul Tripathi Abha Misra department of Instrumentation and Applied Physics Indian Institute of Sciencey BangaloreKarnataka 560012India

Molecular interaction in two-dimensional(2D)van der Waals(vdW)interfaces has drawn tremendous attention for extraordinary materials *** sensing characteristics of molecular interaction has been exploited extensively to reach the detection limit to a few parts-per-billion(ppb)of molecules and far less attention is given to the evolution of persistent current state due to the molecular *** study focuses on molecular memory operation of MoS_(2)-graphene heterostructure based field effect *** resistance state of the device due to the external perturbation of molecules is tuned to get a nearly relaxation free current state at much lower molecular concentration of 10 ppb tofacilitate non-volatile memory features for molecular memory *** ultrafast switching operation in milli-second order is achieved at room temperature for the fastest recovery obtained sofar in any molecular *** process is co-controlled both by molecular as well as external charge density.

关键词： MoS_(2) graphene field effect transistor molecular memory trap charges

Milky Way globular cluster dynamics:are they preferentially co-rotating?

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Research in Astronomy and Astrophysics 2020年第8期20卷 280-286页

作者： Saikat Das Nirupam Roy Astronomy&Astrophysics Group Raman Research InstituteBangalore 560080India department of Physics Indian Institute of ScienceBangalore 560012India

The motion of baryonic components of the Milky Way is governed by both luminous and dark matter content of the ***,the dynamics of Milky Way globular clusters(GCs)can be used as tracers to infer the mass model of the Galaxy up to a large *** this work,we apply the directly observable line-of-sight velocities to test if the dynamics of the GC population are consistent with an assumed axisymmetric gravitational potential of the Milky *** this,we numerically compute the phase space distribution of the GC population where the orbits are either oriented randomly or co-/counter-rotating with respect to the stellar *** we compare the observed position and line-of-sight velocity distribution of^150 GCs with those of the *** found that,for the adopted mass model,the co-rotating scenario is the favored model based on various statistical *** do the analysis with and without the GCs associated with the progenitors of early merger *** analysis can be extended in the near future to include precise and copious data to better constrain the Galactic potential up to a large radius.

关键词： Galaxy:kinematics and dynamics globular clusters:general galaxies:dwarf Galaxy:halo methods:statistical

Prediction based traffic management in a metropolitan area

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Journal of Traffic and Transportation engineering(English Edition) 2020年第4期7卷 447-466页

作者： Suresh Chauhan Pallapa Venkataram Automotiue Research Center Vellore Institute of TechnologyVellore 632014India department of Electrical Communication engineering Indian Institute of ScienceBangalore 560012India

In recent years,modern metropolitan areas are the main indicators of economic growth of *** metropolitan areas,number and frequency of vehicles have increased tremendously,and they create issues,like traffic congestion,accidents,environmental pollution,economical losses and unnecessary waste of *** this paper,we propose traffic management system based on the prediction information to reduce the above mentioned issues in a metropolitan *** proposed traffic management system makes use of static and mobile agents,where the static agent available at region creates and dispatches mobile agents to zones in a metropolitan *** migrated mobile agents use emergent intelligence technique to collect and share traffic flow parameters(speed and density),historical data,resource information,spatio-temporal data and so on,and are analyzes the static *** emergent intelligence technique at static agent uses analyzed,historical and spatio-temporal data for monitoring and predicting the expected patterns of traffic density(commuters and vehicles)and travel times in each zone and *** static agent optimizes predicted and analyzed data for choosing optimal routes to divert the traffic,in order to ensure smooth traffic flow and reduce frequency of occurrence of traffic congestion,reduce traffic density and travel *** performance analysis is performed in realistic scenario by integrating NS2,SUMO,OpenStreatMap(OSM)and MOVE *** effectiveness of the proposed approach has been compared with the existing approach.

关键词： Traffic management Traffic prediction Travel time prediction Agent Emergent intelligence Swarm intelligence

Molecular dynamics simulation of nanometer scale mechanical properties of hexagonal Mgsingle bondLi alloy

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Journal of Magnesium and Alloys 2016年第1期4卷 36-43页

作者： Avik Mahata Koushik Sikdar department of Aerospace engineering Indian Institute of ScienceBengaluru 560012India Surface and Tribology Laboratory Department of Materials Science and EngineeringIndian Institute of TechnologyKanpur 208016India

Nano mechanical behavior of Mgsingle bondLi nanowire is investigated under tension and compression to elicit property alteration due to Li alloying in Mg within hexagonal *** atom method(EAM)is employed to carry out present simulation *** under consideration is supposed to be isotropic and mechanical behavior is uninfluenced by material *** elastic modulus,yield strength both in tension and compression is assessed with change in strain *** of temperature in tension and compression are *** of present simulation work elicit serrated yielding under uniaxial tension,however,twin mediated deformation under compression is completely tuned with previously reported experimental *** investigation bridges nanometer scale properties to microscale material response,which in turn can be applied for designing suitable robust processing routes of this material.

关键词： Molecular dynamic simulation Nanowire Mechanical behavior

Low-cost high entropy alloy(HEA)for high-efficiency oxygen evolution reaction(OER)

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Nano Research 2022年第6期15卷 4799-4806页

作者： Lalita Sharma Nirmal Kumar Katiyar Arko Parui Rakesh Das Ritesh Kumar Chandra Sekhar Tiwary Abhisek K.Singh Aditi Halder Krishanu Biswas School of Basic sciences Advanced Materials Research Centre(AMRC)Indian Institute of Technology Mandi(H.P)KamandMandi 175005India department of materials science and engineering Indian Institute of Technology KanpurKanpur 208016India School of engineering London South Bank UniversityLondonSE10 AAUK materials Research Centre Indian Institute of ScienceBangalore 560012India Metallurgical and materials engineering Indian Institute of Technology KharagpurKharagpur 382355India

Oxygen evolution reaction(OER)is the key step involved both in water splitting devices and rechargeable metal-air batteries,and hence,there is an urgent need for a stable and low-cost material for efficient *** the present investigation,Co-Fe-Ga-NiZn(CFGNZ)high entropy alloy(HEA)has been utilized as a low-cost electrocatalyst for ***,after cyclic voltammetry activation,CFGNZ-nanoparticles(NPs)are covered with oxidized surface and form high entropy(oxy)hydroxides(HEOs),exhibiting a low overpotential of 370 mV to achieve a current density of 10 mA/cm^(2)with a small Tafel slope of 71 mV/*** alloy has higher electrochemical stability in comparison to state-of-the art RuO2 electrocatalyst as no degradation has been observed up to 10 h of *** electron microscopy(TEM)studies after 10 h of long-term chronoamperometry test showed no change in the crystal structure,which confirmed the high stability of *** density functional theory(DFT)based calculations show that the closeness of d(p)-band centers to the Fermi level(EF)plays a major role in determining active *** work highlights the tremendous potential of CFGNZ HEA for OER,which is the primary reaction involved in water splitting.

关键词： high entropy alloy cyclic voltammetry activation oxygen evolution reaction electrocatalyst nanocrystalline catalyst

Ferroptosis mediators vary in metabolic syndrome,type-2 diabetes,and hypercholesterolemia:A meta-analysis report

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Genes & Diseases 2024年第3期11卷 109-112页

作者： Indra Kundu Ashlesha Pande Tannishtha Das Susan Idicula-Thomas Biomedical Informatics Centre Indian Council of Medical Research-National Institute for Research in Reproductive and Child HealthMumbaiMaharashtra 400012India department of Biotechnology St.Xavier's CollegeKolkataWest Bengal 700016India

Metabolic syndrome(MetS)is a complex disorder characterized by the coexistence of phenotypes such as obesity,hypertension,hyperglycemia,high triglyceride level,and low level of high-density lipoprotein *** majorly dri... 详细信息

关键词： obesity cholesterol diabetes

On the application of additive manufacturing methods for auxetic structures: a review

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Advances in Manufacturing 2021年第3期9卷 342-368页

作者： Athul Joseph Vinyas Mahesh Dineshkumar Harursampath Nonlinear Multifunctional Composites Analysis and Design(NMCAD)Laboratory Department of Aerospace EngineeringIndian Institute of ScienceBangalore560012India department of Mechanical engineering National Institute of TechnologySilcharAssam788010India

Auxetic structures are a special class of structural components that exhibit a negative Poisson’s ratio(NPR)because of their constituent materials,internal microstructure,or structural *** realize such structures,specialized manufacturing processes are required to achieve a dimensional accuracy,reduction of material wastage,and a quicker ***,additive manufacturing(AM)techniques play a pivotal role in this *** is a layer-wise manufacturing process and builds the structure as per the designed geometry with appreciable precision and ***,it is extremely beneficial to fabricate auxetic structures using AM,which is otherwise a tedious and expensive *** this study,a detailed discussion of the various AM techniques used in the fabrication of auxetic structures is *** advancements and advantages put forward by the AM domain have offered a plethora of opportunities for the fabrication and development of unconventional ***,the authors have attempted to provide a meaningful encapsulation and a detailed discussion of the most recent of such advancements pertaining to auxetic *** article opens with a brief history of the growth of auxetic materials and later auxetic ***,discussions centering on the different AM techniques employed for the realization of auxetic structures are *** basic principle,advantages,and disadvantages of these processes are discussed to provide an in-depth understanding of the current level of ***,the performance of some of the prominent auxetic structures realized through these methods is discussed to compare their benefits and *** addition,the influences of geometric and process parameters on such structures are evaluated through a comprehensive review to assess their feasibility for the later-mentioned ***,valuable insights into the applications,limitations,and prospects of AM for auxetic structures

关键词： Auxetic Additive manufacturing(AM) Negative Poisson’s ratio(NPR) Mechanical performance Unit-cell structure

On vibration analysis of functionally graded carbon nanotube reinforced magneto-electro-elastic plates with different electro-magnetic conditions using higher order finite element methods

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Defence Technology（防务技术） 2021年第1期17卷 287-303页

作者： M.Vinyas D.Harursampath S.C.Kattimani Nonlinear Multifunctional Composites Analysis and Design(NMCAD)Laboratory Department of Aerospace EngineeringIndian Institute of ScienceBangalore560012India department of Mechanical engineering National Institute of Technology KarnatakaSurathkal575025India

This article deals with evaluating the frequency response of functionally graded carbon nanotube reinforced magneto-electro-elastic(FG-CNTMEE)plates subjected to open and closed electro-magnetic circuit *** this regard finite element formulation has been *** plate kinematics adjudged via higher order shear deformation theory(HSDT)is considered for *** equations of motion are obtained with the help of Hamilton’s principle and solved using condensation *** is found that the convergence and accuracy of the present FE formulation is very good to address the vibration problem of FG-CNTMEE *** the first time,frequency response analysis of FG-CNTMEE plates considering the effect of various circuit conditions associated with parameters such as CNT distributions,volume fraction,skew angle,aspect ratio,length-to-thickness ratio and coupling fields has been carried *** results of this article can serve as benchmark for future development and analysis of smart structures.

关键词： Carbon nanotube Magneto-electro-elastic Higher order shear deformation theory Coupled frequency Electro-magnetic conditions