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Chinese Journal of Chemical Engineering 2020年第7期28卷 1767-1777页

作者： r.chandra sekhar reddy P.Sudarsana reddy Department of Mathematics Rajeev Gandhi Memorial Collge of Engineering&TechnologyNandyalA.P.India

Comparison between unsteady and steady MHD Buongiorno’s model Williamson nanoliquid flow through a wedge with slip effects,chemical reaction and radiation is made in this *** and Brownian motion are also considered in this *** similarity variables are presented to transmute the governing PDEs into the set of non-linear *** most widely authenticated finite element method is implemented to analyze these set of ODEs *** behavior of concentration,temperature and velocity sketches for varied values of relevant parameters is numerically calculated and the outcomes are plotted through *** numerical values of dimensionless rates of mass transfer,heat and velocity are also evaluated and depicted through *** is noted that with upsurging values of angle of wedge parameter,the distributions of temperature of the liquid intensify in both steady and unsteady cases.

关键词： Finite element method Chemical reaction Williamson nanoliquid Thermophoresis Thermal radiation Brownian motion

Systematic review of the efficacy of data-driven urban building energy models during extreme heat in cities:Current trends and future outlook

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Building Simulation 2024年第5期17卷 695-722页

作者： Nilabhra Mondal Prashant Anand Ansar Khan Chirag Deb David Cheong chandra sekhar Dev Niyogi Mattheos Santamouris Department of Architecture and regional Planning Indian Institute of Technology KharagpurKharagpurIndia Department of Geography Lalbaba CollegeUniversity of CalcuttaKolkataIndia School of Architecture Design and PlanningThe University of SydneyAustralia Department of the Built Environment National University of SingaporeSingapore Department of Geological Sciences Jackson School of GeosciencesThe University of Texas at AustinAustinUSA DepartmentofCivil Architecturaland Environmental EngineeringThe Universityof Texas at AustinAustinUA Faculty of Built Environment University of New South WalesAustralia

Energy demand fluctuations due to low probability high impact(LPHI)micro-climatic events such as urban heat island effect(UHI)and heatwaves,pose significant challenges for urban infrastructure,particularly within urban *** short term load forecasting(STLF)of buildings in urban micro-climatic setting(UMS)is obscured by the complex interplay of surrounding morphology,micro-climate and inter-building energy *** urban building energy modelling(UBEM)approaches to provide quantitative insights about building energy consumption often neglect the synergistic impacts of micro-climate and urban morphology in short temporal *** order modelling,unavailability of rich urban datasets such as building key performance indicators for building archetypes-characterization,limit the inter-building energy dynamics consideration into *** addition,mismatch of resolutions of spatio-temporal datasets(meso to micro scale transition),LPHI events extent prediction around UMS as well as its accurate quantitative inclusion in UBEM input organization step pose another degree of *** review aims to direct attention towards an integrated-UBEM(i-UBEM)framework to capture the building load fluctuation over multi-scale spatio–temporal *** highlights usage of emerging data-driven hybrid approaches,after systematically analysing developments and limitations of recent physical,data-driven artificial intelligence and machine learning(AI-ML)based modelling *** also discusses the potential integration of google earth engine(GEE)-cloud computing platform in UBEM input organization step to(i)map the land surface temperature(LST)data(quantitative attribute implying LPHI event occurrence),(ii)manage and pre-process high-resolution spatio-temporal UBEM *** the potential of digital twin,central structed data models to integrate along UBEM workflow to reduce uncertainties related to building archetype characterizat

关键词： urban heat island(UHI) urbanmicro-climate urban morphology urban building energy modelling(UBEM) digitaltwin shorttermload forecasting(STLF) googleearthengine(GEE)

Observation of free oscillations after the 2010 Chile and 2011 Japan earthquakes by superconducting gravimeter in Kutch,Gujarat,India

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Geodesy and Geodynamics 2023年第1期14卷 52-64页

作者： chandra sekhar Pedapudi Madhusudhana rao Katlamudi Severine rosat Institute of Seismological research GandhinagarGujaratIndia Department of Earth Sciences Gujarat UniversityAhmedabadGujaratIndia Institut Terre et Environnement de Strasbourg CNRS UMR 7063StrasbourgFrance

In this paper,we present observations of free oscillations of the Earth after major earthquakes in Chile(February 27,2010,Mw8.8)and Japan(March 11,2011,Mw9.1)using data from the dual-sphere superconducting gravimeter(SG-055),installed at Badargadh(23°0.47 N,70°0.62 E),Kutch,Gujarat,India in March *** see the noise characteristics,we calculated the power spectral density of the gravity time series of 5 quiet days in the frequency band 0.05-20 mHz using the new low noise model(NLNM)as a *** compared the noise level of the Badargadh site to other SG sites around the *** shows that the Badargadh SG is in a low noise *** find that the noise increases at frequencies below 1 *** a characteristic is also observed in Djougou(Afrique,Benin)and Strasbourg(France).Using theoretical tides for Gujarat,we estimated a scale factor of about-814 nm/s~2/V for Gravl(lowersphere)and about-775 nm/s~2/V for Grav2(upper-sphere).We corrected the influence of atmospheric pressure from the one-second gravity data before switching to the frequency *** extracted a total of 53 Earth’s Free Oscillations(EFO)modes during the earthquake in Japan and about 47 EFO modes during the earthquake in *** are able to extract the lowest0S2spheroidal mode(0.30945 mHz or54 min)and0S0radial mode(0.81439 mHz or 20 min).The longer time series shows individual0S2singlets and0S3(0.46855 mHz)singlets due to the Coriolis splitting *** cross-referenced the frequencies of these modes using the PrEM model and previous global *** correlation coefficient between the observed and the PrEM model for these two events are 0.999 for Japan earthquake and 0.993 for Chile *** validates the quality of the data useful for low-frequency studies in *** also calculated the relative deviations of our observed fundamental modes with previously determined observed and theoretical *** found that the relative deviations of our observed free oscillations

关键词： Superconducting gravity data Free oscillations PrEM model

Enhanced resistive switching properties of HfAlOx/ZrO2- based rrAM devices

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Progress in Natural Science:Materials International 2022年第5期32卷 602-607页

作者： P.r.sekhar reddy Venkata raveendra Nallagatla Yedluri Anil Kumar G.Murali School of Material Science and Engineering Pusan National University Department of Physics and Oxide research Centre Memory and Catalyst Research Center Hankuk University of Foreign Studies Materials Center Leoben Forschung GmbH Department of Physics United Arab Emirates University Department of Polymer Science and Engineering Department of IT-Energy Convergence (BK21 FOUR) Chemical Industry Institute Korea National University of Transportation

resistive random-Access Memory(rrAM) devices are recognized as potential candidates for next-generation memory devices, due to their smallest cell size, high write/erase speed, and endurance. Particularly, the resistive switching(rS) characteristics in oxide materials have offered new opportunities for developing CMOScompatible high-density rrAM devices. In this study, the rS behavior of HfAlOx/ZrO2thin films sandwiched structure between TiN bottom electrode and Au top electrodes were investigated. It was found that Au/HfAlOx/ZrO2/TiN stacks were superior in terms of rS performance when compare to Au/HfAlOx/TiN memory stacks. The devices demonstrated a good resistance ratio of high resistance state and low resistance state ～103 for Au/HfAlOx/TiN and ～105 for Au/HfAlOx/ZrO2/TiN stacks, respectively. Both stacks showed good retention characteristics(>104s) and endurance(>103cycles). The experimental current-voltage characteristics fitted with different conducting mechanisms, the linear lower bias region is dominated by ohmic conductivity, whereas the non-linear higher bias region was dominated by space-charge limited current conduction mechanism.

关键词： Nonvolatile memory rrAM resistive switching mechanism Atomic layer deposition Current conduction mechanism

Improvising the Self-Healing Capabilities of Concrete Using Different Pozzolanic Materials and Crystalline Admixtures

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Journal of Wuhan University of Technology(Materials Science) 2022年第3期37卷 429-439页

作者： A ravitheja T chandra sekhara reddy C Sashidhar SVr Engineering College AyyalurNandyalKurnoolAndhra PradeshIndia Civil Engineering G Pulla Reddy Engineering CollegeKurnoolAPIndia Jawaharlal Nehru Technological University AnantapurIndia

To analyse the self-healing capacities in terms of mechanical performance of the pozzolanic materials,such as,fly ash,metakaolin and silica fume and crystalline ***-cracked concrete cubes with about 0.05 mm width were exposed to four different environmental conditions at different exposure times in order to determine the effect of temperature and water availability on the self-healing *** the exposure,the control and tested concrete cubes were evaluated for regained strength,void reduction,corrosion inhibition,damp proofing,relative impermeability and *** samples with SF10CA have better cementitious filling and low percentage of voids and water absorption.

关键词： crystalline admixtures pozzolanic materials self-healing

Enhancing the energy efficiency for prolonging the network life time in multi-conditional multi-sensor based wireless sensor network

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Journal of Control and Decision 2023年第1期10卷 72-81页

作者： raviteja Kocherla M.chandra sekhar ramesh Vatambeti research scholar Department of CSEPresidency UniversityBangaloreIndia Department of CSE Presidency UniversityBangaloreIndia Department of CSE CHRIST(Deemed to be University)BangaloreIndia

A wireless sensor network is one of the networks that is highly demanding by various real-timenetworking applications nowadays. A huge amount of sensor nodes is deployed in the networkrandomly and distributed. Most of the applications using wireless sensor network (WSN) aresurveillance monitoring applications like a forest, home, healthcare, environment, and remotemonitoring systems. Based on the application usage, the type of sensor, a number of sensornodes are deployed in such a manner where the sensors can be used effectively. But the sensornodes are restricted in the battery and sensing region. Thus, the battery of the sensor nodesis decreased based on the nodes’ function. The energy level of the sensor nodes highly affectsthe network lifetime. Improving the energy efficiency in WSN is one of the most important challengingtasks. Most of the earlier research works have proposed various methods, techniques,and routing protocols, but they are application dependent and as a common method. So, thispaper is motivated to propose a Multi-Conditional Network Analysis (MCNA) framework for savingthe energy level of the sensor nodes by reducing energy consumption. TheMCNAframeworkinvolves two different clustering processes with cluster head selection, choosing the best nodesbased on the signal strength, and the best route for data transmission. The data transmissionis done by cluster based on source-destination based. The simulation results proved that theproposed MCNA framework outperforms the other existing methods.

关键词： Wireless sensor networks energy efficiency clustering signal strength verification

Comparative Electrocatalytic Oxygen Evolution reaction Studies of Spinel NiFe_(2)O_(4) and Its Nanocarbon Hybrids

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Transactions of Tianjin University 2022年第1期28卷 80-88页

作者： Pratik V.Shinde rutuparna Samal chandra sekhar rout Centre for Nano and Material Sciences Jain UniversityBengaluruKarnataka 562112India

Electrocatalytic oxygen evolution reaction(OEr)is one of the crucial reactions for converting renewable electricity into chemical fuel in the form of *** date,there is still a challenge in designing ideal cost-effective OEr catalysts with excellent activity and robust *** hybridization of transition metal oxides and carbonaceous materials is one of the most effective and promising strategies to develop high-performance ***,this work synthesized hybrids of NiFe_2 O_4 spinel materials with two-dimensional(2D)graphene oxide and one-dimensional(1 D)carbon nanotubes using a facile solvothermal *** activities of NiFe_(2)O_(4) with 2 D graphene oxide toward OEr were realized to be superior even to the 1 D carbon nanotube-based electro catalyst in terms of overpotential to reach a current density of10 mA/cm^(2) as well as Tafel *** NiFe_(2)O_(4) with 2 D graphene oxide hybrid exhibits good stability with an overpotential of 327 mV at a current density of 10 mA/cm^(2) and a Tafel slope of 103 mV/*** high performance of NiFe_(2)O_(4) with 2 D graphene oxide is mainly attributed to its unique morphology,more exposed active sites,and a porous structure with a high surface ***,an approach of hybridizing a metal oxide with a carbonaceous material offers an attractive platform for developing an efficient electrocatalyst for water electrochemistry applications.

关键词： Oxygen evolution reaction Metal oxide Graphene oxide Carbon nanotubes Stability

In situ deposited cobalt-magnesium selenates as an advanced electrode for electrochemical energy storage

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Journal of Magnesium and Alloys 2022年第12期10卷 3565-3575页

作者： Manchi Nagaraju S.chandra sekhar Bhimanaboina ramulu Shaik Junied Arbaz Jae Su Yu Department of Electronics and Information Convergence Engineering Kyung Hee University1732 Deogyeong-aeroGihung-guYongin-siGyeonggi-do 17104Republic of Korea

Currently,bimetallic selenates have attracted much attention as a prominent electrode composite material for supercapacitors owing to their higher redox chemistry and superior electrical ***,we synthesized cobalt-magnesium selenates (CoSeO3-Mg Se O4,CMS) via a facile hydrothermal process,followed by *** first,cobalt-magnesium oxide (Co2.32Mg0.68O4,CMO) was in situ prepared by a one-pot hydrothermal *** investigation on the morphological change was performed by synthesizing the same CMO samples at different growth times by keeping the temperature *** CMO electrode designed for 8 h of growth time (CMO-8 h)with an attractive morphology showed a higher areal capacity of 101.7μAh cm-2(at 3 m A cm-2) than the other CMO electrodes prepared for 6 and 10 *** exalted performance was achieved by the selenization of the CMO-8 h sample to form the CMS *** 3 m A cm-2,the resulted CMS exhibited nearly three times higher capacity,i.e.,385.4μAh cm-2,than the CMO-8 h ***,an asymmetric cell fabricated with CMS as a positive electrode also revealed good energy storage *** the applied voltage between 0 and 1.5 V,the asymmetric cell demonstrated maximum energy density of 0.159 m Wh cm-2(18.6 Wh kg-1) and maximum power density of 18.47 m W cm-2(1938 W kg-1),***,novel magnesium-based metal selenates can act as an efficient electrode for energy storage.

关键词： Co2.32Mg0.68O4 CoSeO3–MgSeO4 In situ formation Energy storage Asymmetric cell

Effect of minocycline and its nano-formulation on central auditory system in blast-induced hearing loss rat model

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Journal of Otology 2023年第1期18卷 38-48页

作者： Venkatesan Perumal Arun reddy ravula Ningning Shao Namas chandra Center for Injury Biomechanics Materialsand MedicineDepartment of Biomedical EngineeringNew Jersey Institute of TechnologyNewarkNJ07102USA

Blast injuries are common among the military service members and *** of the devastating effects of blast wave induced TBI is either temporary or permanent hearing *** hearing loss using minocycline is restricted by optimal drug concentration,route of administration,and its ***,therapeutic approach using novel therapeutic delivery method is in great *** the different delivery methods,nanotechnology-based drug delivery is desirable,which can achieve longer systemic circulation,pass through some biological barriers and specifically targets desired *** current study aimed to examine therapeutic effect of minocycline and its nanoparticle formulation in moderate blast induced hearing loss rat model through central auditory *** *** nanoparticle at reduced dose and frequency than regularly administered toxic *** moderate blast exposure,rats had hearing impairment as determined by ABr at 7-and 30-days post *** chronic condition,free minocycline also showed the significant reduction in ABr *** central auditory system,it is found in this study that minocycline nanoparticles ameliorate excitation in inferior colliculus;and astrocytes and microglia activation after the blast exposure is reduced by minocycline nanoparticles *** study demonstrated that in moderate blast induced hearing loss,minocycline and its nanoparticle formulation exhibited the optimal therapeutic effect on the recovery of the ABr impairment and a protective effect through central auditory *** conclusion,targeted and non-targeted nanoparticle formulation have therapeutic effect on blast induced hearing loss.

关键词： Minocycline Nanoparticle Hearing loss Blast injury and targeted drug delivery

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