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Electrical and non-linear optical studies on electrospun ZnO/BaO composite nanofibers

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Frontiers of materials Science 2012年第1期6卷 69-78页

作者： G.NIXON SAmUEL vijayakumar m.RATHNAKUmARI P.SURESHKUmAR Department of Physics R.M.K.Engineering CollegeR.S.M.NagarKavaraipettai 601206India materiais Research Centre Department of PhysicsVelammal Engineering CollegeChennai 600066India

Nanocapacitors and nonvolatile ferroelectric random access memories require nanoscale thin film coatings with ferroelectric properties. One dimensional ferroelectric nanofibers are used in ferroelectric memory devices owing to the fact that decrease of the dimensionality of the memory device elements will reduce the addressing and appreciably increase the storage capacity, Novel ZnO/BaO nanocomposite fibers exhibiting ferroelectric properties have been prepared in the form of non-woven mesh by electrospinning the sol derived from the sol-gel route, Thin cylindrical nanofibers of average diameter 100 nm have been obtained and their morphology is confirmed by SEm and AFm images. In the electrospinning process, the effect of the working distance on the fiber morphology was studied and it showed that working distance between 11 and 15 cm can produce fibers without beads and the decrease in working distance in this range increases the fiber diameter. Powder XRD was used to identify the phases and EDX analysis confirmed the presence of ZnO/BaO. Dielectric and non-linear optical properties have also been studied. The dielectric studies showed that ZnO/BaO composite nanofibers undergo a phase transition from ferroelectric to paraelectric at 323 K.

关键词： nanocomposite fiber sol-gel process dielectric property non-linear opticalproperty ferroelectric property

In vitro antiplasmodial activity of methanolic extracts from seaweeds of South West Coast of India

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Asian Pacific Journal of Tropical medicine 2011年第11期4卷 862-865页

作者： S Ravikumar G Ramanathan m Gnanadesigan A Ramu V vijayakumar School of marine Sciences Department of Oceanography and Coastal Area StudiesAlagappa UniversityThondi CampusThondi - 623 409Ramanathapuram DistrictTamil NaduIndia Department of microbiology V.H.S.N.College.Virudhunagar DistrictTamil NaduIndia School of Chemistry Department of Inorganic ChemistryMadurai Kamaraj UniversityMadurai DistrictTamil NaduIndia

Objective:To identify the in vitro antiplasmodial activity of seaweed plants against Plasmodium falciparum ***:A total of eight seaweeds were collecled from Kanvakumari district,Tainilnadu,*** in vitro antiplasmodial activity was performed in 96 well plates against Plasmodium falciparum,and preliminary phytochemcial analysis were performed for the ***:Of the selected plants Enteromorpha intestinalis(2.61%) showed maximum percentage of *** minimum concentration of inhibitory(IC_(50)) value was observed with Chaetomorpha antennina[(26.37±4.14)μg/ml.]further,the positive controls such as chloroquine and artemether showed antiplasmodial activities(IC_(50)) with(19.10±5.93) and(6.03±0.21)μg/mL concentrations,*** preliminary phytochemical analysis of the seaweed extracts showed a variety of phytochemical constituents such as carboxylic acids,phenols,protein, resins,steroids and ***:The antiplasmodial activity of the seaweed extract might due to the presence of sugars and phenolic *** the present findings,it is concluded that,the seaweed extract of Chaetomorpha antennina can be further used as a putative antiplasmodial drugs in near future.

关键词： Antiplasmodial activity IC_(50) Phytochemical Seaweeds Plasmodium falciparum

Dye reduction-based electron-transfer activity monitoring assay for assessing microbial electron transfer activity of microbial fuel cell inocula

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Journal of Environmental Sciences 2020年第10期32卷 171-177页

作者： Kartik S.Aiyer Roshan Rai B.S.vijayakumar Department of Biosciences Sri Sathya Sai Institute of Higher LearningPrasanthi NilayamPuttaparthiAndhra Pradesh-515134India

microbial fuel cells (mFC) utilize microbes as catalysts to convert chemical energy to *** used for mFC operation must therefore contain active microbial *** dye reduction-based electron-transfer activity monitoring (DREAm) assay was employed to evaluate different inocula used in mFCs for their microbial bioelectrical *** assay utilizes the redox property of methylene Blue to undergo color change from blue to colorless state upon microbial *** extent of methylene Blue reduction was denoted as the DREAm assay *** assay was initially performed on a microbial culture along with the growth curve and estimation of colony forming units (CFUs).DREAm coefficient correlated to the CFU/m L obtained over time as growth *** assay was then extended to water samples (domestic sewage,lake and a man-made pond) serving as inocula in *** wastewater gave the highest DREAm coefficient (0.300±0.05),followed by pond (0.224±0.07) and lake (0.157±0.04) water *** density obtained conformed to the DREAm coefficient values,with the three samples generating power densities of 46.45±5.1,36.12±3.2 and 25.08±4.3 m W/m^2 *** have also studied the role of addition of various carbon sources and their concentrations towards improving the sensitivity of the *** DREAm assay is a rapid,easy-to-perform and cost-effective method to assess inocula for their suitability as anolytes in terms of electron transfer potential in mFCs.

关键词： Dye reduction Electron transfer methylene Blue microbial fuel cell Wastewater

Biosynthesis of silver nanoparticles by using mangrove plant extract and their potential mosquito larvicidal property

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Asian Pacific Journal of Tropical medicine 2011年第10期4卷 799-803页

作者： m Gnanadesigan m Anand S Ravikumar m maruthupandy V vijayakumar S Selvam m Dhineshkumar AK Kumaraguru School of Energy Environmental and Natural ResourcesDepartment of Marine and Coastal StudiesMadurai Kamaraj UniversityMadurai-625021Tamil NaduIndia School of marine Sciences Department of Oceanography and Coastal Area StudiesAlagappa UniversityThondi CampusThondi-623409Ramanathapuram DistrictTamil NaduIndia School of Chemistry Department of Inorganic ChemistryMadurai Kamaraj UniversityMadurai-625021Tamil NaduIndia School of Chemistry Department of Industrial ChemistryAlagappa UniversityKaraikudi-630003Tamil NaduIndia

Objective:To identify the larvicidal activities of silver nano particles synthesised with Rhizophora mucronata（***） leaf extract against the larvae of Aedes aegypti（***） and Culex quinquefasciatus（***）.methods:In vitro larvicidal activities such as LC50 and LC90 were assessed for the *** and *** larval ***, characterisation such as UV,XRD,FTIR and AFm analysis were carried out for the synthesised silver nano ***:The LC50 value of the synthesised silver nano particle was identified as 0.585 and 0.891 mgg/L for *** and *** larvae respectively. Further,the LG90 values are also identified as 2.615 and 6.291 mg/L for *** and Cx. quinquefasciatus species *** synthesised silver nanoparticles have maximum absorption at 420 nm with the average size of 60-95 *** XRD data showed 20 intense values with various degrees such as 37.10°,47.66°,63.97°and 70.01°.The FTIR data showed prominent peaks in（3 426.89,2 925.49,2 869.56,2 346.95,1 631.49,1 031.73,669.18 and 455.12） different ***:The biosynthesis of silver nanoparticles with leaf aqueous extract of R. mucronata provides potential source for the larvicidal activity against mosquito borne diseases.

关键词： Biosynthesis mangroves Larvicidal

Anti-diabetic activity of quercetin extracted from Phyllanthus emblica ***: In silico and in vivo approaches

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Journal of Pharmaceutical Analysis 2018年第2期8卷 109-118页

作者： Prabhu Srinivasan S.vijayakumar Swaminathan Kothandaraman manogar Palani Computational Phytochemistry Lab PG and Research Department of Botany and Microbiology A. V. V. M Sri Pushpam College (Autonomous) Department of Physics RKM Vivekananda College (Autonomous)

In this study, molecular interactions of the ligands, quercetin, gallic acid, and metformin with various diabetes mellitus-related protein targets, such as glycogen phosphorylase and peroxisome proliferatoractivated receptor gamma, were assessed. It was revealed that quercetin possesses good binding affinity to both targets. Quercetin is a major constituent of methanolic extracts of Phyllanthus emblica fruit. The antihyperglycemic effect of quercetin in streptozotocin(STZ)-induced diabetic rats was examined. The isolated quercetin administered at a dose of 75 mg/kg body weight produced a maximum decrease of14.78% in blood glucose levels in the diabetic rats after 7 days of treatment. Furthermore, quercetin doses of 50 and 75 mg/kg were shown to significantly improve the profiles of triglycerides, high-density lipoprotein, very-low-density lipoprotein, low-density lipoprotein, and total cholesterol at the end of the study in STZ-induced diabetic rats. The administration of quercetin(25, 50, and 75 mg/kg body weight)daily for 28 days in STZ-induced diabetic rats resulted in a significant decrease in blood glucose and urine sugar levels, with a considerable rise in plasma insulin and hemoglobin levels. Therefore, quercetin is a potential drug with antidiabetic and antihyperglycemic action mediated by changes in the levels of glucose, cholesterol, and triglycerides as indicated by in silico and in vivo studies.

关键词： Bioactive molecules Glycogen phosphorylase molecular docking Phyllanthus emblica Quercetin Albino Wister male rats

Optimization of Process Parameters for Injection moulding of Nylon6/SiC and Nylon6/B_(4)C Polymer matrix Composites

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Fluid Dynamics & materials Processing 2022年第2期18卷 223-232页

作者： G.Boopathy K.Gurusami m.Chinnapandian K.R.vijayakumar St.Peter’s Institute of Higher Education and Research Chennai600054India Vel Tech Rangarajan Dr.Sagunthala R&D Institute of Science and Technology Chennai600062India St.Peter’s College of Engineering and Technology Chennai600054India mGR Educational and Research Institute Chennai600095India

In this research study,the mechanical properties of several Polymer matrix composites are *** composites are multi-phase materials in which reinforcing materials are properly mixed with a polymer *** precisely,Nylon 6 reinforced with 5,15 and 25 wt.%of silicon carbide(SiC)and Nylon 6 reinforced with 5,15 and 25 wt.%of boron carbide(B_(4)C),prepared by means of an injection moulding process at three different injection pressures are *** attention is paid to the tensile and impact strength of these *** Taguchi technique is used to optimize the process parameters such as reinforcement material,its percentage and the injection *** is observed that the specimens 5%SiC with 80 mPa injection pressure display a better tensile strength and similarly the specimen 5%B_(4)C with 90 mPa injection pressure have a superior impact strength.

关键词： PmCs Nylon 6 injection moulding Taguchi technique ANOVA

Double-Blockchain Assisted Secure and Anonymous Data Aggregation for Fog-Enabled Smart Grid

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Engineering 2022年第1期8卷 159-169页

作者： Siguang Chen Li Yang Chuanxin Zhao vijayakumar Varadarajan Kun Wang Jiangsu Key Lab of Broadband Wireless Communication and Internet of Things Nanjing University of Posts and TelecommunicationsNanjing 210003China Jiangsu Engineering Research Center of Communication and Network Technology Nanjing University of Posts and TelecommunicationsNanjing 210003China Anhui Provincial Key Laboratory of Network and Information Security Anhui Normal UniversityWuhu 241000China School of Computer Science and Engineering Vellore Institute of TechnologyChennai 600127India Department of Electrical and Computer Engineering University of CaliforniaLos AngelesCA 90095USA

As a future energy system,the smart grid is designed to improve the efficiency of traditional power systems while providing more stable and reliable ***,this efficient and reliable service relies on collecting and analyzing users’electricity consumption data frequently,which induces various security and privacy *** address these challenges,we propose a double-blockchain assisted secure and anonymous data aggregation scheme for fog-enabled smart grid named ***,we design a three-tier architecture-based data aggregation framework by integrating fog computing and the blockchain,which provides strong support for achieving efficient and secure data collection in smart ***,we develop a secure and anonymous data aggregation mechanism with low computational overhead by jointly leveraging the Paillier encryption,batch aggregation signature and anonymous *** particular,the system achieves fine-grained data aggregation and provides effective support for power dispatching and price adjustment by the designed double-blockchain and two-level data ***,the superiority of the proposed scheme is illustrated by a series of security and computation cost analyses.

关键词： Blockchain Fog computing Homomorphic encryption Smart grid Anonymity

Shining Light on Anion-mixed Nanocatalysts for Efficient Water Electrolysis: Fundamentals, Progress, and Perspectives

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Nano-micro Letters 2022年第3期14卷 79-119页

作者： Yaoda Liu Paranthaman vijayakumar Qianyi Liu Thangavel Sakthivel Fuyi Chen Zhengfei Dai State Key Laboratory for mechanical Behavior of materials Xi’an Jiaotong UniversityXi’an 710049People’s Republic of China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072People’s Republic of China

Hydrogen with high energy density and zero carbon emission is widely acknowledged as the most promising candidate toward world’s carbon neutrality and future sustainable ***-splitting is a constructive technology for unpolluted and high-purity H2 production,and a series of non-precious electrocatalysts have been developed over the past *** further improve the catalytic activities,metal doping is always adopted to modulate the 3d-electronic configuration and electron-donating/accepting(e-DA)properties,while for anion doping,the electronegativity variations among different non-metal elements would also bring some potential in the modulations of e-DA and metal valence for tuning the *** this review,we summarize the recent developments of the many different anion-mixed transition metal compounds(e.g.,nitrides,halides,phosphides,chalcogenides,oxyhydroxides,and borides/borates)for efficient water electrolysis ***,we have introduced the general information of water-splitting and the description of anion-mixed electrocatalysts and highlighted their complementary functions of mixed ***,some latest advances of anion-mixed compounds are also categorized for hydrogen and oxygen evolution *** rationales behind their enhanced electrochemical performances are *** but not least,the challenges and future perspectives are briefly proposed for the anion-mixed water dissociation catalysts.

关键词： multianions Electrocatalysts Water electrolysis Hydrogen energy Oxygen evolution

In silico prediction of monovalent and chimeric tetravalent vaccines for prevention and treatment of dengue fever

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The Journal of Biomedical Research 2018年第3期32卷 222-236页

作者： vijayakumar Subramaniyan Ramesh Venkatachalam Prabhu Srinivasan manogar Palani Computational Phytochemistry Laboratory P.G. and Research Department of Botany and microbiology A.V.V.M. Sri Pushpam College (Autonomous)

Reverse vaccinology method was used to predict the monovalent peptide vaccine candidate to produce antibodies for therapeutic purpose and to predict tetravalent vaccine candidate to act as a common vaccine to cover all the dengue virus serotypes. Envelope（E）-proteins of DENV-1-4 serotypes were used for vaccine prediction using NCBI,Uniprot/Swissprot, Swiss-prot viewer, VaxiJen V2.0, TmHmm, BCPREDS, Propred-1, Propred and mHC Pred. Eproteins of DENV-1-4 serotypes were identified as antigen from which T cell epitopes, through B cell epitopes, were predicted to act as peptide vaccine candidates. Each selected T cell epitope of E-protein was confirmed to act as vaccine and to induce complementary antibody against particular serotype of dengue virus. Chimeric tetravalent vaccine was formed by the conjugation of four vaccines, each from four dengue serotypes to act as a common vaccine candidate for all the four dengue serotypes. It can be justifiably concluded that the monovalent 9-mer T cell epitope for each DENV serotype can be used to produce specific antibody against dengue virus and a chimeric common tetravalent vaccine candidate to yield a comparative vaccine to cover any of the four dengue virus serotype. This vaccine is expected to be highly immunogenic against dengue fever.

关键词： dengue serotypes dengue virus vaccine E-proteins mHC Ⅰ and Ⅱ