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Chinese Physics B 2014年第12期23卷 5-13页

作者： M.Syed Ali R.saravanakumar Department of Mathematics Thiruvalluvar University

In this paper, the robust H∞control problem for a class of stochastic systems with interval time-varying and distributed delays is discussed. The system under study involves parameter uncertainty, stochastic disturbance, interval time-varying,and distributed delay. The aim is to design a delay-dependent robust H∞control which ensures the robust asymptotic stability of the given system and to express it in the form of linear matrix inequalities（LMIs）. Numerical examples are given to demonstrate the effectiveness of the proposed method. The results are also compared with the existing results to show its conservativeness.

关键词： distributed delay interval time-varying delay H∞control linear matrix inequality(LMI) stochastic systems

Augmented Lyapunov approach to H_∞ state estimation of static neural networks with discrete and distributed time-varying delays

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Chinese Physics B 2015年第5期24卷 140-147页

作者： M.Syed Ali R.saravanakumar Department of Mathematics Thiruvalluvar University

This paper deals with H∞ state estimation problem of neural networks with discrete and distributed time-varying delays. A novel delay-dependent concept of H∞ state estimation is proposed to estimate the H∞ performance and global asymptotic stability of the concerned neural networks. By constructing the Lyapunov-Krasovskii functional and using the linear matrix inequality technique, sufficient conditions for delay-dependent H∞ performances are obtained, which can be easily solved by some standard numerical algorithms. Finally, numerical examples are given to illustrate the usefulness and effectiveness of the proposed theoretical results.

关键词： distributed delay H∞ state estimation neural networks stability analysis

Robust H_∞ control of uncertain systems with two additive time-varying delays

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Chinese Physics B 2015年第9期24卷 25-34页

作者： M.Syed Ali R.saravanakumar Department of Mathematics Thiruvalluvar University

This paper is concerned with the problem of delay-dependent robust H∞control for a class of uncertain systems with two additive time-varying delays. A new suitable Lyapunov–Krasovskii functional（LKF） with triple integral terms is constructed and a tighter upper bound of the derivative of the LKF is derived. By applying a convex optimization technique, new delay-dependent robust H∞stability criteria are derived in terms of linear matrix inequalities（LMI）. Based on the stability criteria, a state feedback controller is designed such that the closed-loop system is asymptotically ***, numerical examples are given to illustrate the effectiveness of the proposed method. Comparison results show that our results are less conservative than the existing methods.

关键词： additive time-varying delays Lyapunov method H∞ control linear matrix inequality

Grain boundary effect on structural, optical, and electrical properties of sol-gel synthesized Fe-doped SnO_(2) nanoparticles

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Chinese Physics B 2021年第4期30卷 555-564页

作者： Archana V Lakshmi Mohan Kathirvel P saravanakumar S Department of Sciences Amrita School of EngineeringCoimbatoreAmrita Vishwa VidyapeethamIndia Research and Development Center Bharathiar UniversityCoimbatore-641046TamilnaduIndia GRD Center for Materials Research Department of PhysicsP S G College of TechnologyCoimbatore-641004TamilnaduIndia Department of Physics N S S CollegePandalam-689501KeralaIndia

Tin oxide(SnO_(2)) and iron-doped tin oxide(Sn_(1-x)Fe_(x)O_(2),x=0.05 wt%,0.10 wt%) nanoparticles are synthesized by the simple sol-gel *** structural characterization using x-ray diffraction(XRD) confirms tetragonal rutile phases of the *** variations in lattice parameters and relative intensity with Fe-doping concentration validate the incorporation of iron into the *** compressive strain present in the lattice estimated by using peak profile analysis through using Williamson-Hall plot also exhibits the influence of grain boundary formation in the *** radiative recombination and quenching observed in optical characterization by using photoluminescence spectrum(PL) and the shift in the band gap estimated from UV-visible diffused reflectance spectrum corroborate the grain boundary *** spectrum and the morphological analysis by using a field emission scanning electron microscope(FESEM) also indicate the formation of grain *** compositional analysis by using energy dispersive x-ray spectrum(EDAX) confirms Fe in the SnO_(2) *** conductivity studies exhibit that the impendence increases with doping concentration increasing and the loss factor decreases at high frequencies with doping concentration increasing,which makes the Sn_(1-x)Fe_(x)O_(2) a potential candidate for device applications.

关键词： sol-gel compressive strain grain boundary AC conductivity

Impact of mangrove vegetation on seasonal carbon burial and other sediment characteristics in the Vellar-Coleroon estuary, India

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Journal of Forestry Research 2014年第4期25卷 787-794页

作者： Kandasamy Kathiresan Venugopal Gomathi Raj Anburaj Kandasamy saravanakumar Centre of Advanced Study in Marine Biology Faculty of Marine Sciences Annamalai University Parangipettai 608 502 India

This work quantified the total carbon and 12 other sediment characteristics at 10 soil depths, in planted and or natural mangrove forests in comparison with non-vegetated soil for four seasons of the year 2009-2010 in the Vellar-Coleroon estuarine complex, India. The sedi- ment characteristics varied significantly between mangrove-vegetated and non-vegetated habitats or seasons of analysis, but not between soil depths. The mangrove sediments were rich in total carbon and total or- ganic carbon as compared to non-mangrove sediments （p 〈0.01）. Total carbon was 98.2% higher in mature mangroves and 41.8% in planted mangroves than that in non-mangrove soil. Total organic carbon was as much as 2.5 times greater in mature mangroves and 2 times greater in planted mangroves than that in unvegetated soil. Carbon contents also varied many fold by season. Total carbon content was 8.6 times greater during pre-monsoon, 4.1 times greater during post-monsoon and 2.5 times greater during monsoon than during summer （P〈0.01 in all cases）. Similarly, total organic carbon was 5.9 times greater during pre-monsoon, 3.1 times greater during post-monsoon and 69% greater during monsoon than during summer. In general, higher levels of sediment carbon were recorded during pre and post-monsoon seasons than during other seasons. Total carbon concentration was correlated negatively to temperature, sand and phosphorus （P 〈0.01）; positively correlated with redox potential, silt, clay, C/N ratio, potassium （P 〈0.01） and nitrogen （P〈0.05）; but not correlated with soil depth, pH or salinity. This work revealed that the carbon burial was rapid at the annual rate of 2.8% for total carbon, and 6.7% for total organic carbon in mangrove-planted sediment. Cleating of mangroves can result in significantly and rapidly reduced carbon *** study highlights the importance of natural and plantation mangrove stands for conserving sediment carbon in the tropical coastal domain.

关键词： mangrove sediment carbon burial total carbon total organiccarbon

Photocatalytic degradation of environmental perilous gentian violet dye using leucaena-mediated zinc oxide nanoparticle and its anticancer activity

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Rare Metals 2019年第4期38卷 277-286页

作者： Krishnaswamy Kanagamani Pitchaipillai Muthukrishnan Karunamoorthy saravanakumar Karikalan Shankar Ayyasami Kathiresan Department of Chemistry SNS College of Technology Coimbatore 641035India Department of Chemistry Faculty of Engineering Karpagam Academy of Higher Education Coimbatore 641021 India Department of Chemistry VHNSN College Virudhunagar 626001 India

Phytomediated synthesis of metal oxide nanoparticles has become a key research area in nanotech no logy due to its wide applicability in various biomedical fields. The present work explores the biosynthesis of zinc oxide nanoparticles (ZnO-NPs) using Leucaena leucocephala leaf extract. The synthesised ZnO-NPs were characterised by ultraviolet-visible (UV-Vis) spectroscopy, seanning electron microscopy (SEM), energydispersive X-ray spectroscopy (EDX), Fourier transform infrared spectroscopy (FTIR). X-ray diffraction (XRD), transmission electron microscopy (TEM) and selected area electron diffraction (SAED) studies. Biosynthesised ZnONPs are found to have wurtzite hexagonal structure with particles distributed in the range of 50-200 nm as confirmed by TEM studies. The anticancer activity of ZnONPs against MCF-7 (breast cancer) and PC-3 (human prostate cancer) cell lines was evaluated using 3-(4, 5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay. From the assay, biosynthesised ZnO-NPs have better cytotoxic activity on PC-3 cell lines than MCF- 7 cell lines. The in vitro cytotoxicity studies of biosynthesised ZnO-NPs against Dalton lymphoma ascites (DLA) cells reveal better “ntitunior activity of 92% inhibition with concentration of 200μg ·ml^-1 of ZnO-NPs, and as the concentration increases, the anticancer efficiency as well increases, and also, it has excellent photocatalytic activity to degrade crystal violet dye in aqueous solution after irradiation of 90 min. The result suggests that the green synthesis of ZnO-NPs could be easily recovered and reused several times without any significant loss of the catalytic activity. The advantage of this technique lies in its low cost, easily clinibable and non-use of toxic agents.

关键词： Nano structured materials Catalysis Sea nning electron microscopy X-ray diffraction

Comprehensive Insight into the Mechanism, Material Selection and Performance Evaluation of Supercapatteries

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Nano-Micro Letters 2020年第7期12卷 43-88页

作者： saravanakumar Balasubramaniam Ankita Mohanty Suresh Kannan Balasingam Sang Jae Kim Ananthakumar Ramadoss School for Advanced Research in Polymers Laboratory for Advanced Research in Polymeric MaterialsCentral Institute of Plastics Engineering and TechnologyBhubaneswar 751024India Department of Materials Science and Engineering Faculty of Natural SciencesNorwegian University of Science and Technology(NTNU)Trondheim 7491Norway Nanomaterials and Systems Laboratory Major of Mechatronics EngineeringFaculty of Applied Energy SystemJeju National UniversityJeju 63243Republic of Korea

Electrochemical energy storage devices(EESs)play a crucial role for the construction of sustainable energy storage system from the point of generation to the end user due to the intermittent nature of renewable ***,to meet the demand for next-generation electronic applications,optimizing the energy and power densities of EESs with long cycle life is the crucial *** e orts have been devoted towards the search for new materials,to augment the overall performance of the *** there are a lot of ongoing researches in this field,the performance does not meet up to the level of commercialization.A further understanding of the charge storage mechanism and development of new electrode materials are highly *** present review explains the overview of recent progress in supercapattery devices with reference to their various *** di erent charge storage mechanisms and the multiple factors involved in the performance of the supercapattery are described in ***,recent advancements in this supercapattery research and its electrochemical performances are ***,the challenges and possible future developments in this field are summarized.

关键词： Supercapattery Energy density Power density Redox materials Carbon materials

Modeling of COVID-19 disease disparity in gastric organoids reveals the spatiotemporal dynamics of SARS-CoV-2 infectivity

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Journal of Molecular Cell Biology 2022年第2期14卷 80-83页

作者： Wenwen Wang Fengrui Yang Jie Lin saravanakumar Muthusamy Shihao Du McKay Mullen Fatima Garba Wanjuan Wang Xu Liu Tao Li Zhihong Yang Xia Ding Felix Aikhionbare Xinjiao Gao Zhikai Wang Xing Liu Xuebiao Yao MOE Key Laboratory for Cellular Dynamics University of Science&Technology of China School of Life SciencesHefei 230027China Keck Center for Organoids Plasticity and Department of Surgery Morehouse School of MedicineAtlantaGA 30310USA Anhui Key Laboratory for Cellular Dynamics&Chemical Biology CAS Center of Excellence in Molecular Cell SciencesHefei 230027China Department of Gastroenterology Beĳing University of Chinese MedicineBeĳing 100081China

Dear Editor,The promptness and continuous expansion of the coronavirus disease 2019(COVID-19)pandemic,elicited by severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)and its variants,has presented an unprecedented impact on human health(WHO Coronavirus(COVID-19)Dashboard,2021).Although vaccination has attenuated the severe symptoms,there is no specific antiviral medication available for preventing the viral spread(Drayman et al.,2021).

关键词： acute respiratory

Effect of imidazole based polymer blend electrolytes for dye-sensitized solar cells in energy harvesting window glass applications

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Chinese Journal of Chemical Engineering 2019年第11期27卷 2807-2814页

作者： K.M.Manikandan A.Yelilarasi S.S.saravanakumar P.Senthamaraikannan Anish Khan Abdullah M.Asiri Department of Physics Kamaraj College of Engineering and TechnologyK.VellakulamVirudhunagar625701 MaduraiTamil NaduIndia Department of Mechanical Engineering Kamaraj College of Engineering and TechnologyK.VellakulamVirudhunagar625701 MaduraiTamil NaduIndia Chemistry Department Faculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia Center of Excellence for Advanced Materials Research King Abdulaziz UniversityJeddah 21589P.O.Box 80203Saudi Arabia

The exploration of polymer electrolyte in the field of dye sensitized solar cell(DSSC) can contribute to increase the invention of renewable energy applications. In the present work, the influence of imidazole on the poly(vinylidene fluoride)(PVDF)–poly(methyl methacrylate)(PMMA)–Ethylene carbonate(EC)–KI–I2 polymer blend electrolytes has been evaluated. The different weight percentages of imidazole added into polymer blend electrolytes have been prepared by solution casting. The prepared films were characterized by Fourier transform infrared spectroscopy(FTIR), X-ray diffraction(XRD), thermogravimetric analysis(TGA), UV–visible spectra, photoluminescence spectra and impedance spectroscopy. The surface roughness texture of the film was analyzed by atomic force microscopy(AFM). The ionic conductivity of the optimized polymer blend electrolyte was determined by impedance measurement, which is 1.95 × 10-3 S·cm-1 at room temperature. The polymer electrolyte containing 40 wt% of imidazole content exhibits the highest photo-conversion efficiency of 3.04%under the illumination of 100 m W·cm-2. Moreover, a considerable enhancement in the stability of the DSSC device was demonstrated.

关键词： Polymer blend electrolyte Imidazole Dye-sensitized solar cell Surface roughness Ionic conductivity

Inter-annual and seasonal variations in hydrological parameters and its implications on chlorophyll a distribution along the southwest coast of Bay of Bengal

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Acta Oceanologica Sinica 2015年第6期34卷 94-100页

作者： Shanthi R. Poornima D. Raja K. Sarangi R.K. saravanakumar A. Thangaradjou T. Centre of Advanced Study in Marine Biology Faculty of Marine Sciences Annamalai University Marine Geo and Planetary Sciences Group Space Application Centre (ISRO)

Seasonal and inter-annual variability of hydrological parameters and its impact on chlorophyll distribution was studied from January 2009 to December 2011 at four coastal stations along the southwest Bay of Bengal. Statistical analysis （principal component analysis （PCA）, two-way analysis of variance （ANOVA） and correlation analysis） showed the significant impact of hydrological parameters on chlorophyll distribution in the study area. The ranges of different parameters recorded were 23.8-33.8℃ （SST）, 4.00-36.00 （salinity）, 7.0-9.2 （pH）, 4.41-8.32 mg/L （dissolved oxygen）, 0.04-2.45 μmol/L （nitrite）, 0.33-16.10 μmol/L （nitrate）, 0.02-2.51 μmol/L （ammonia）, 0.04-3.32 μmol/L （inorganic phosphate）, 10.09-85.28 μmol/L （reactive silicate） and 0.04-13.8 μg/L （chlorophyll）. PCA analysis carried out for different seasons found variations in the relationship between physico-chemical parameters and chlorophyll in which nitrate and chlorophyll were positively loaded at PC1 （principal component 1） during spring inter-monsoon and at PC2 （principal component 2） during other seasons. Likewise correlation analysis also showed significant positive relationship between chlorophyll and nutrients especially with nitrate （~0.734）. Distribution of hydrobiological parameters between stations and distances was significantly varying as evidenced from the ANOVA results. The study found that the spatial and temporal distribution of chlorophyll was highly dependent on the availability of nutrients especially, nitrate in the southwest Bay of Bengal coastal waters.

关键词： chlorophyll nutrients PCA nitrate correlation analysis Bay of Bengal