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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

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Influence of dynamic soil-pile raft-structure interaction:an experimental approach

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Earthquake Engineering and Engineering Vibration 2015年第4期14卷 625-645页

作者： Rajib Saha Sumanta Haldar sekhar chandra Dutta Civil Engineering Department National Institute of Technology Agartala School of Infrastructure Indian Institute of Technolgy Bhubaneswar Department of Civil Engineering Indian School of Mines

Traditionally seismic design of structures supported on piled raft foundation is performed by considering fixed base conditions, while the pile head is also considered to be fixed for the design of the pile foundation. major drawback of this assumption is that it cannot capture soil-foundation-structure interaction due to flexibility of soil or the inertial interaction involving heavy foundation masses. Previous studies on this subject addressed mainly the intricacy in modelling of dynamic soil structure interaction (DSSI) but not the implication of such interaction on the distribution of forces at various elements of the pile foundation and supported structure. A recent numerical study by the authors showed significant change in response at different elements of the piled raft supported structure when DSSI effects are considered. The present study is a limited attempt in this direction, and it examines such observations through shake table tests. The effect of DSSI is examined by comparing dynamic responses from fixed base scaled down model structures and the overall systems. This study indicates the possibility of significant underestimation in design forces for both the column and pile if designed under fixed base assumption. Such underestimation in the design forces may have serious implication in the design of a foundation or structural element.

关键词： soil-foundation-structure interaction piled raft foundation base shear pile head shear model test

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A comparative analysis of unsteady and steady Buongiorno’s Williamson nanoliquid flow over a wedge with slip effects

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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

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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

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Navigating the hydrogen prospect:A comprehensive review of sustainable source-based production technologies,transport solutions,advanced storage mechanisms,and CCUS integration

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Journal of Energy Chemistry 2024年第10期97卷 166-215,I0005页

作者： Sehar Tasleem.chandra sekhar Bongu mohan Raj Krishnan Edreese Housni Alsharaeh College of Science and General Studies Alfaisal UniversityPO Box 50927Riyadh 11533Saudi Arabia

The review is a comprehensive discussion of current research advances,commercial scale developments,challenges,and techno-eco nomics for the entire H_(2) value chain,including production,mainly focusing on sustainable sources,storage,and *** challenges,advantages,and uses of H_(2) energy are included at ***,apart from the sustainable production approaches,the approaches and current developments for combating the carbon dioxide(CO_(2))emissions from existing H_(2) production facilities are highlighted in terms of ca rbon capture,utilization,and storage(CCUS).Concisely,the review discusses current material and recent technological adva ncements in developing pilot projects and large-scale establishments for viable and rapidly emerging sou rce-ba sed H_(2) productio ***,the review also aims to provide an in-depthdiscussion and explore current developments based on the advantages of H_(2) energy in terms of its utilization,based on its high energy density,and its ability to be used as a feedstock and *** the other hand,the challenges of H_(2) are also elabo ***,the role of CCUS in a carbon-neutral economy and value chain for minimization of emissions from existing facilities is thoroughly deliberated,and the recent commercial-scale implementation of CCUS technologies is *** the utilization and recycling of captured CO_(2) emissions along with H_(2) to produce e-fuels in terms of current advances is detailed in this *** rthermore,the most applicable,efficient,a nd develo ping approaches are discussed for physical and chemical H_(2) storage,considering recent la rge-scale implementations of liquid carriers and liquid organic hydrogen carriers as storage ***,the review elaborates on recent insights into advances in H_(2) transport infrastructure,including compressed and liquid H_(2) delivery via roads,ships,pipelines,and flight *** review gives precise insights into the recent scenario through

关键词： Source-based hydrogen Hydrogen utilization Carbon capture E-fuels Hydrogen storage Transport infrastructure

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Terminalia arjuna bark extract attenuates picrotoxin-induced behavioral changes by activation of serotonergic,dopaminergic,GABAergic and antioxidant systems

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Chinese Journal of Natural medicines 2017年第8期15卷 584-596页

作者： chandra sekhar Y Phani Kumar G Anilakumar K.R. Applied Nutrition Division Defence Food Research LaboratoryDRDOMysore-570011KarnatakaIndia

Stress and emotion are associated with several illnesses from headaches to heart diseases and immune deficiencies to central nervous system. Terminalia arjuna has been referred as traditional Indian medicine for several ailments. The present study aimed to elucidate the effect of T. arjuna bark extract(TA) against picrotoxin-induced anxiety. Forty two male Balb/c mice were randomly divided into six experimental groups(n = 7): control, diazepam(1.5 mg·kg^(–1)), picrotoxin(1 mg·kg^(–1)) and three TA treatemt groups(25, 50, and 100 mg/kg). Behavioral paradigms and PCR studies were performed to determine the effect of TA against picrotoxin-induced anxiety. The results showed that TA supplementation increased locomotion towards open arm(EPm) and illuminated area(light-dark box test), and increased rearing frequency(open field test) in a dose dependent manner, compared to picrotoxin(P more, TA increased number of licks and shocks in Vogel's conflict. PCR studies showed an up-regulation of several genes, such as BDNF, IP_3, D_2L, CREB, GABAA, SOD, GPx, and GR in TA administered groups. In conclusion, alcoholic extract of TA bark showed protective activity against picrotoxin in mice by modulation of genes related to synaptic plasticity, neurotransmitters, and antioxidant enzymes.

关键词： Anxiety Terminalia arjuna Gene expression Picrotoxin Neurotransmitters LC-mS

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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

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A Novel Single Switch High Gain DC-DC Converter Topology for Renewable Energy Systems

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Energy Engineering 2021年第2期118卷 199-209页

作者： G.Indira Kishore m.Premkumar Ramesh Kumar Tripathi chandra sekhar Nalamati GmR Institute of Technology RajamSrikakulamAndhra Pradesh532127India motilal Nehru National Institute of Technology AllahabadUttar Pradesh211004India

Renewable energy with sources such as photovoltaic(PV)or fuel cells can be utilized for the generation of elec-trical *** these sources generate fewer voltage values and therefore require high gain converters to match with DC bus voltage in *** high gain converters can be implemented with switched capacitors to meet the required DC bus *** capacitors operate in a series and parallel combination during switch-ing operation and produce high static gain,limits reverse voltage that appears across the components.A novel converter is proposed that satisfies all the features such as high voltage gain,only one switch,forces less potential stress cross the components,ripple current is *** features of the proposed converter are verified through mATLAB/SImULINK.

关键词： DC-DC converter high gain renewable energy switched capacitors

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Recent developments in self-powered smart chemical sensors for wearable electronics

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Nano Research 2021年第11期14卷 3669-3689页

作者： Aaryashree Surjit Sahoo Pravin Walke Saroj Kumar Nayak chandra sekhar Rout Dattatray J.Late Shibaura Institute of Technology Koto-CityTokyo135-8548Japan School of Basic Sciences Indian Institute of Technology BhubaneswarJatniOdisha752050India National Centre for Nanosciences and Nanotechnology University of MumbaiMumbaiMaharashtra400098India Centre for Nano and material Sciences Jain UniversityRamanagaramBangalore562112India Centre for Nanoscience&Nanotechnology Amity University MaharashtraMumbai-Pune ExpresswayBhatanPost—SomathnePanvelMaharashtra410206India

The next generation of electronics technology is purely going to be based on wearable sensing systems. Wearable electronic sensors that can operate in a continuous and sustainable manner without the need of an external power sources, are essential for portable and mobile electronic applications. In this review article, the recent progress and advantages of wearable self-powered smart chemical sensors systems for wearable electronics are presented. An overview of various modes of energy conversion and storage technologies for self-powered devices is provided. Self-powered chemical sensors (SPCS) systems with integrated energy units are then discussed, separated as solar cell-based SPCS, triboelectric nano-generators based SPCS, piezoelectric nano-generators based SPCS, energy storage device based SPCS, and thermal energy-based SPCS. Finally, the outlook on future prospects of wearable chemical sensors in self-powered sensing systems is addressed.

关键词： chemical sensors self-powered wearable electronics smart sensors

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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

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