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    MAXIMUM INDEPENDENT SEIDEL ENERGY OF A GRAPH
    (IOP Publishing Ltd, 2021) Mary, U; Sreeja, S
    The concept of Maximum Independent Seidel energy EImaxS(G)of a simple connected graph Ghas been innovated by us and we have calculated the maximum independent seidel energies of some standard graphs. Also we have discovered few basic properties related to maximum independent seidel energy.
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    SYNTHESIS OF CU DOPED COBALT OXIDE NANOPARTICLES AS AMMONIA GAS SENSOR OPERATING AT ROOM TEMPERATURE
    (Science Direct, 2021) Jincy C.S; Meena P
    In this work, hydrothermally synthesized copper doped cobalt oxide nanoparticles were utilized for the detection of ammonia gas. The powder samples were described by different characterization techniques. XRD spectrum revealed the crystalline structure of the sample. The morphology and component analysis of nanoparticles was done by SEM and EDAX respectively. The FTIR investigation affirmed the presence of functional group in the sample. Optical properties were assessed by UV–Vis spectroscopy. The optical properties were evaluated by UV–Vis spectroscopy. Doping is an effective way to increase gas sensitivity. The sensing properties of cobalt oxide nanoparticles has been enhanced due to the utilization of Cu as a dopant. In the present work, we put emphasis on a cost effective method to achieve supreme sensitivity towards NH3 gas at room temperature even at a lower concentration of 5 ppm. The presence of Cu ions on the surface of Co3O4 nanoparticles was found to enhance the sensor performance.
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    TUNING MAGNETIC AND DIELECTRIC PROPERTIES OF STRONTIUM TITANIUM OXIDE (SRTIO3) AND NEODYMIUM STRONTIUM TITANIUM OXIDE (ND0.5 SR0.5TIO3) PEROVSKITE MATERIALS FOR MICRO-STRIP PATCH ANTENNA APPLICATIONS
    (Bharathiar University, Coimbatore, 2020-03-05) Shabna J; Pavithra R; Priyadharsini N
    Interesting properties of perovskite materials such as very stable in structure, ferroelecticity and high dielectric constant have attracted to study for microwave antenna applications. In this work, we have synthesized Strontium Titanium Oxide (SrTiO3) and Neodymium Strontium Titanium oxide (Nd0.5 Sr0.5TiO3) perovskite materials to analyze their magnetic and dielectric properties for Micro Strip Patch Antenna Applications. In the present study, SriO3 and Nd0.5 Sr0.5TiO3 are synthesized through the different starting precursors of Sr(NO3)3, TiO2, Sr(NO3)2 , Nd2O3, HNO3, TiO2 and C6H8O7.H2O using facile combustion method. Then the homogeneity and phase purity of the synthesized compounds are confirmed through X-ray diffraction (XRD). From the XRD analysis, it is found that SrMnTiO3 and the Nd0.5 Sr0.5TiO3 have the Cubic Crystal Structure. In addition, we have calculated the crystallinity, crystallite size, lattice constants and cell volume to confirm the structural information of the as-prepared perovskites. Surface morphology of the sample clearly depicts the uniform formation of clusters of nano particles. FTIR analysis shows the presence of the various metal oxygen (M – O) bonds through the corresponding functional frequencies. The microwave measurements up to 10 GHz shows the variation in the dielectric properties for these compounds and it clearly explains the possibility of exploring these perovskites for micro-strip patch antenna applications.
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    SYNTHESIS AND CHARACTERIZATION OF POLYMER DOPED STRONTIUM MANGANESE TITANIUM OXIDE (SRMN0.5TI0.5O3) CUBIC PEROVSKITES OF MICRO-STRIP PATCH ANTENNA APPLICATIONS
    (Bharathiar University, Coimbatore, 2020-03-05) Nandhini S; Suvetha S; Priyadharsini N
    A new method to reconfigure, tune or program an antenna with the help of pervoskites materials is elaborated. The method relies on the changing dielectric properties of the perovskite materials with incorporating polymer. Using pure Sr(NO3)2, TiO2, C4H6MnO4.4H2O and C6H8O7.H2O as a starting precursors to synthesize SrMn0.5Ti0.5O3 as a cubic perovskite material. The polyethylene glycol (PEG) was impregnated with the above precursor mixture and the resultant compound is PEG doped SrMn0.5Ti0.5O3 through solution combustion method. The phase purity, crystal structure, homogeneity, functional groups and surface morphology of SrMn0.5Ti0.5O3 and PEG doped SrMn0.5Ti0.5O3 perovskites were analysed through XRD, FTIR and FESEM analysis. The dielectric constant of the metal oxide polymer composite was investigated at various frequencies from 3 GHz to 10 GHz through Vector Network Analyzer (VNA). From VNA results, it is observed that the PEG doped SrMn0.5Ti0.5O3 exhibits higher dielectric constant than the parent compound. Hence, the polymer present in the perovskites improves the stability and the dielectric behavior of the polymer metal oxide composite, which seems to be excellent substrate for micro-strip antenna applications.
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    SYNTHESIS AND CHARACTERISATION OF RARE EARTH BASED NDMNO3 ELECTRODES FOR PEROVSKITE SOLAR CELLS
    (Chikkanna Govt. Arts College, Tiruppur, 2019-02-01) D, Sathiyapriya; N, Priyadharsini
    Perovskite materials are widely used in the electronic devices due to their interesting physical properties. NdMnO3 has the Perovskite structure and is applicable in the magnetic memory storage device. To prepare NdMnO3, Nd(NO3)3, (C4H6MnO4.4H2O) and citric acid are taken as the starting precursors. The compound is synthesized by combustion method which is confirmed through X-ray diffraction. The crystallinity, crystallite size, lattice constants and cell volume have been calculated from XRD analysis. Surface morphology of the sample clearly depicts the uniform formation of clusters of nano particles. The electrical conductivity measurements indicate that NdMnO3 have better dielectric properties. It has the antiparallel spin orientation and hence it exhibits the antiferromagnetic property. The Energy Dispersive Spectroscopy analysis gives the chemical composition of the compound. The magnetic measurements were carried out through Vibration Sample Magnetometer. The linear and non-hysteric curve has been obtained from the VSM analysis. The result confirms the antiferromagnetic property of NdMnO3 compound. By tuning the bandgap of this perovskite material may emerge out the hybrid type perovskite solar cells.
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    DEVELOPMENT OF RARE EARTH BASED NDMNO3 ELECTRODES FOR PEROVSKITE SOLAR CELLS
    (PSGR Krishnammal College for Women, Coimbatore, 2019-01-21) S, Monisha; S, Suvetha; D, Sathiyapriya; N, Priyadharsini
    Rare earth type perovskite materials are widely used in the electronic devices due to their interesting physical properties. NdMnO3 has the Perovskite structure and is applicable in the magnetic memory storage device. The high purity type starting precursors are taken to prepare the rare earth type NdMnO3. The compound is synthesized by combustion method which is confirmed through X-ray diffraction. The crystallinity, crystallite size, lattice constants and cell volume have been calculated from XRD analysis. Surface morphology of the sample clearly depicts the uniform formation of clusters of nano particles. The electrical conductivity measurements indicate that NdMnO3 have better dielectric properties. It has the antiparallel spin orientation and hence it exhibits the antiferromagnetic property. The Energy Dispersive Spectroscopy analysis gives the chemical composition of the compound. The magnetic measurements were carried out through Vibration Sample Magnetometer. The linear and non-hysteric curve has been obtained from the VSM analysis. The result confirms the antiferromagnetic property of NdMnO3 compound. By tuning the bandgap of this rare earth perovskite material may emerge out the hybrid type perovskite solar cells.
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    SOL-GEL THERMOLYSIS SYNTHESIS OF POSITIVE ELECTRODE LINIPO4 AND ITS ELECTROCHEMICAL PROPERTIES FOR HYBRID SUPERCAPACITORS
    (Coimbatore Institute of Technology (CIT), Coimbatore, 2019-01-03) N, Priyadharsini
    A battery type electrode material of LiNiPO4 electrodes were synthesized through different chelating agents such as citric acid, L-Ascorbic acid and D-sorbitol for the fabrication of aqueous type hybrid supercapacitors. The phase purity, homogeneity and the functional groups present in the synthesized LiNiPO4 are characterized through X-ray diffraction and FTIR measurements. Field emission scanning electron microscopy (FESEM) images show that there is a uniform and spherical shaped nano particles present in the compound synthesized from D-sorbitol than the remaining samples. The redox peaks and plateau regions in the cyclic voltammetry (CV) and Galvanostatic charge-discharge (GCD) profiles infer the dominance of battery-type charge process rather than a capacitive mechanism. As a result, LiNiPO4 exhibits a maximum specific capacitance of 417 F g-1 at 2 mV s-1 and 357 F g-1 at 1mA cm-2 in 1 M LiOH, which enables as a suitable cathode material for hybrid supercapacitor. Also, the assembled hybrid supercapacitor delivered a high energy density of 12.5 Wh kg-1 at 200 W kg-1 as well as a longer cycle life of 89% at a current density of 1 mA cm-2 over 2000 cycles is noticed. These results infer that LiNiPO4could be used as a novel electrode material for hybrid supercapacitor application.
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    SUPERCAPCITIVE PERFORMANCE OF INDIUM TIN OXIDE (ITO) NANO PARTICLESR
    (Dr. N.G.P. Institute of Technology, Coimbatore, 2017-01-25) Agnes Latha B; Lavanya S; Priyadharsini N
    Indium tin oxide nano particles are synthesized via hydrothermal and ultrasonication methods. The XRD pattern confirms that the as-prepared Indium Tin oxide (ITO) nano particles consist of both In2O3 phase in cubic and rhombohedral structures and SnO2 phase in orthorhombic structure. The FTIR spectra of ITO nanoparticles show that two bands around 1590 cm-1 and 435 cm-1 are due to the presence of In-O bond in the compound. The peaks corresponding to SnO2 appear at lower frequency. The peaks at 550 and 660 cm-1are related to Sn-O-Sn antisymmetric stretching vibration and also a weak band around 470 cm-1 is due to the presence of symmetric vibration in the compound. The sample has moderate agglomerated nanoparticles which is flattened shaped structure. The synthesized samples are used as a negative electrode material for supercapacitor applications in three electrode configuration and the electrochemical properties of the ITO nano electrode is analyzed through cyclic voltammetry (CV) and Galvanostatic charge-discharge (GCD) measurements. From CV measurements, the sample synthesized via hydrothermal method seems to have better specific capacitance values than the samples from ultrasonication. The potential-time profiles measured from GCD measurements exhibit a good linearity, indicating a well-defined capacitive behavior of the ITO nano particle. The non-linear behavior of the curves explains the electrochemical reaction happens due to the redox mechanism and the pseudocapacitive nature of the electrode. It can be seen that the specific capacitance of ITO negative electrode maintains about 90% of its initial value after 5000 cycles, signifying a good stability of the compound.
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    PHOTOCATALYTIC DEGRADATION OF POLYSTYRENE AND POLYSTYRENE-ZNO NANOCOMPOSITE
    (PSGR Krishnammal College for Women, Coimbatore, 2016-01-07) K G, Dhivya; N, Priyadharsini
    In this work, the solid-phase photocatalytic degradation of polystyrene (PS) and polystyrene-ZnO nanocomposite were investigated under the ambient air in order to assess the feasibility of developing photodegradable polymers. PS-ZnO nanocomposites were prepared by using PS solution in which 5% percentage of ZnO nanoparticles were dispersed by constant stirring. The prepared nanocomposites such as PS, PS-5%ZnO were exposed to UV irradiation for various time intervals i.e. 30, 60, 90 and 120 h. On increasing irradiation time, increase in degradation efficiency was observed. Moreover, the effect of UV radiation on its structural, optical and degradation properties of various PS-ZnO nanocomposite has been studied. Further, SEM analysis reveals the morphological nature of the nanocomposites and confirms the degradation of nanocomposites. Results shows that an increase in ZnO concentration with Polystyrene enhances the photo-catalytic degradation of PS-ZnO nanocomposite. Hence the influence of Nano Zinc oxide particles and its efficient contribution in degradation of polymer was confirmed.
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    RESEARCH IN HIGHER EDUCATION - TECHNOLOGY TRANSFER FROM ACADEMIC INSTITUTION TO INDUSTRY
    (Madurai Kamaraj University, Madurai, 2013-11-15) N, Priyadharsini; M, Angeline
    At the dawn of the 21st century, our society faces new and urgent challenges. Research and innovation represent the first steps to be undertaken to come out of the current economic downturn. Tougher competition and the arrival of new world players leave us with no other alternative but to invest in the future through the development of research and innovation. Higher education trains people to take up different economic roles in society and spurs technological innovation that drives economic growth. With the fast pace of change in Liberalisation, Privatisation and globalisation era, the role of higher education plays an essential role in the development of industry and economy. Research is seen as a primary and a vital function of any educational institution of the higher education system. Looking at the technology trends,it is seen that some of the most significant technologies of the future are likely to be at the intersection of disciplines are began to flourish. In India, More number of people has engaged in research activities to enrich their knowledge in the new upcoming fields of the modern world. Many researchers have brought out their innovative research outputs in peer-reviewed journals to make it globally recognised. The new innovations from the applied research can be filed for IPR and it can be technologically transferred. There is often a focus on big ideas and breakthrough innovations; the experience has however shown that gradual and experimental innovations bring in greatest gains in productivity that drives economic growth. Therefore, it is not only the big ideas that are important, but also millions of little ideas produced and put to use are also important. This Paper focuses on IP protection and its licensing for commercialisation and transfer of technology from universities to industry. This places premium on diffusion of technology in society where the higher education institutions could play a vital role.