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Nanosized CuO Particles via a Supramolecular Strategy
Premkumar, T.,Geckeler, K. ,E. WILEY-VCH Verlag 2006 Small Vol.2 No.5
<B>Graphic Abstract</B> <P>Uniform cupric oxide nanoparticles have been prepared for the first time via a novel supramolecular complex (see image, left) by thermal decomposition, in which cucurbit[7]uril was selected to encapsulate copper acetate, which acts as the precursor for the CuO nanoparticles (right). The procedure affords particles with a narrow size distribution and of very small diameter (≈5 nm). <img src='wiley_img/16136810-2006-2-5-SMLL200500454-content.gif' alt='wiley_img/16136810-2006-2-5-SMLL200500454-content'> </P>
T. Immanuvel David,M. V. Mukesh,S. Kumaravel,G. Ramesh,R. Premkumar 대한공간정보학회 2017 Spatial Information Research Vol.25 No.4
Land use land cover (LU/LC) changes over the period are essential to understand the development of human activities within a region to define the impact of anthropogenic and natural activities. The virtual assessment of LU/LC changes between 2000 and 2016 is carried out in Pearl City (Thoothukudi) using Remote-Sensing data and GIS tool. This change detection is done by 15 m resolution cloud-free Advanced Spaceborne Thermal Emission and Reflection Radiometer data captured during the year 2000 and 2016. The dynamic changes depict the major land use features like settlements, saltpan, crop land, vegetation, barren and water body from satellite data through supervised classifications of a maximum likelihood algorithm. The classified images highlight a series of constructive results in settlement (4.30%), vegetation (4.00%), saltpan (0.24%) and pessimistic results in barren land (-7.68%), crop land (-0.64%) and water body (-0.23%) respectively. The study recommends that urbanization of settlement land usage is highly mobilized in Thoothukudi coastal areas.
Design and Implementation of New Topology for Solar PV Based Transformerless Forward Microinverter
Premkumar M,Sumithira T.R 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.1
Recently, transformerless inverters play a vital role for single phase low voltage solar photovoltaic (PV) due to low cost, lesser weight, small size and high efficiency. However, the leakage current produces electromagnetic interferences (EMI), current distortion on the grid with additional losses which affects the performance of the inverter. In this paper, a new inverter topology, to deal with the problem of leakage current is proposed. The various conventional H6 topologies are simulated, compared and evaluated based on the leakage current, performance and safety with the proposed inverter topology. This work focuses on transformerless inverter which is best suitable for Module Integrated Converter (MIC) or microinverter. The proposed topology is employed with unipolar sinusoidal pulse width modulation, and it can reduce the common mode (CM) current. The performance analysis is carried out on different topologies using MATLAB/Simulink environment and the proposed inverter experimentally verified on a 150W prototype. Based on the analysis, simulation and experimental results, the comparison also presented for future reference.
송선구,안종호,송창식,( T. Premkumar ) 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
Binapthyl-based conjugated polymers/gold nanoparticle (AuNP) hybrid nanocomposites were in-situ synthesized by the oxidation of polymer with auric acid. Bithiophene groups in the polymer reduced the Au(III) into Au(0) and the AuNPs can be stabilized by the polymer, especially through binapthyl groups of tweezer-like structure. The hydrodynamic radius of the polymer affects the size and shape of polymer/AuNPs hybrid nanocomposites. We investigated the polymer/AuNPs hybrid nanocomposites changing the molecular weight and hydrodynamic radi of the polymers in different solvent. The synthesized polymer/AuNPs hybrid nanocomposites were analysized by scanning electron microscope (SEM), transmission electron microscopy (TEM), dynamic light scattering (DLS), cyclic voltammetry (CV), and UV-vis spectroscopy. The polymers that have large hydrodynamic radii in solution formed large, multipod-like AuNPs structures and those with small hydrodynamic radii formed small, sphere-like AuNPs.