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Biological Pollutant

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Teguh Aryo Nugroho – One of the best experts on this subject based on the ideXlab platform.

  • effect of Biological Pollutant on outdoor polymer insulator under acceleration environment condition
    International Review of Electrical Engineering-iree, 2016
    Co-Authors: Made Yulistya I Negara, Dimas Anton Asfani, Daniar Fahmi, Teguh Aryo Nugroho

    Abstract:

    This study deals with the investigation on the effect of mineral contaminant and microBiological Pollutant on outdoor polymer insulator. An experimental setup using pre-conditioned salt fog test is used to accelerate the desired environmental condition required by the Pollutant to grow. As result, the effect of mineral contaminant on the growth of microBiological Pollutant in the polymer insulator can be analyzed in a faster manner. Chlorella vulgaris as microBiological Pollutant was successfully cultivated on 24 kV polymer insulators in a controlled environmental condition. The analysis is presented by comparing the performances between pre-conditioned and normal insulators. A scanning electron microscope (SEM) test is also performed to determine the growth of chlorella vulgaris. Some leakage current and breakdown voltage measurement tests were conducted to determine the insulation performance of insulators. SEM results show that chlorella vulgaris layer did not grow on the normal insulators. Meanwhile chlorella vulgaris layer was formed up to of 30.5 μm depth inside pre-conditioned insulator surface. The test at 40 kV ac voltage shows up to 0.23 mA leakage current was detected on pre-conditioned insulators. The degradation of breakdown voltage of 12.5 % was detected after 8 weeks treatment.

Made Yulistya I Negara – One of the best experts on this subject based on the ideXlab platform.

  • effect of Biological Pollutant on outdoor polymer insulator under acceleration environment condition
    International Review of Electrical Engineering-iree, 2016
    Co-Authors: Made Yulistya I Negara, Dimas Anton Asfani, Daniar Fahmi, Teguh Aryo Nugroho

    Abstract:

    This study deals with the investigation on the effect of mineral contaminant and microBiological Pollutant on outdoor polymer insulator. An experimental setup using pre-conditioned salt fog test is used to accelerate the desired environmental condition required by the Pollutant to grow. As result, the effect of mineral contaminant on the growth of microBiological Pollutant in the polymer insulator can be analyzed in a faster manner. Chlorella vulgaris as microBiological Pollutant was successfully cultivated on 24 kV polymer insulators in a controlled environmental condition. The analysis is presented by comparing the performances between pre-conditioned and normal insulators. A scanning electron microscope (SEM) test is also performed to determine the growth of chlorella vulgaris. Some leakage current and breakdown voltage measurement tests were conducted to determine the insulation performance of insulators. SEM results show that chlorella vulgaris layer did not grow on the normal insulators. Meanwhile chlorella vulgaris layer was formed up to of 30.5 μm depth inside pre-conditioned insulator surface. The test at 40 kV ac voltage shows up to 0.23 mA leakage current was detected on pre-conditioned insulators. The degradation of breakdown voltage of 12.5 % was detected after 8 weeks treatment.

Anthony J. Stace – One of the best experts on this subject based on the ideXlab platform.

  • Conformation-resolved UV spectra of Pb(II) complexes: a gas phase study of the sandwich structures [Pb(toluene)2]2+ and [Pb(benzene)2]2+.
    Journal of Chemical Physics, 2013
    Co-Authors: Lifu Ma, Tsukiko Takashima, Joseph Koka, Helen J. Kimber, Anthony J. Stace

    Abstract:

    Toxic heavy metals, such as Pb(2+), have become important targets for the development of efficient receptors that are capable of recognizing their presence as environmental and Biological Pollutants, and an important part of that receptor-metal characterization process is the provision of spectral evidence that identifies the presence of a metal ion. From results reported here on a combined experimental and theoretical study it is shown that, when complexed with aromatic ligands, Pb(2+) is capable of yielding structured UV spectra, which: (i) exhibit discrete electronic transitions that include significant contributions from the metal ion; (ii) are very sensitive to the electronic properties of coordinating ligands; and (iii) are sensitive to subtle changes in coordination geometry. Two aromatic sandwich complexes, [Pb(benzene)2](2+) and [Pb(toluene)2](2+) have been prepared in the gas phase and their UV action spectra recorded from ions held and cooled in an ion trap. Whilst [Pb(benzene)2](2+) exhibits a spectrum with very little detail, that recorded for [Pb(toluene)2](2+) reveals a rich structure in the wavelength range 220-280 nm. Theory in the form of density functional theory (DFT) shows that both types of complex take the form of hemidirected structures, and that [Pb(toluene)2](2+) can adopt three distinct conformers depending upon the relative positions of the two methyl groups. Further calculations, using adiabatic time-dependent DFT to assign electronic transitions, provide evidence of individual [Pb(toluene)2](2+) conformers having been resolved in the experimental spectrum. Of particular significance for the development of methods for identifying Pb(2+) as an environmental or Biological Pollutant, is the observation that there are distinct ligand-to-metal charge transfer transitions in the UV that are sensitive to both the geometry and the electronic characteristics of molecules that accommodate the metal ion.