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RISS 인기검색어
- 검색키워드
- 저자 : K. K. Satpathy (검색결과 4 건)
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Trihalomethanes in the Cooling Discharge of a Power Plant on Chlorination of Intake Seawater
R. K. Padhi,S. Subramanian,A. K. Mohanty,S. N. Bramha,M. V. R. Prasad,K. K. Satpathy 대한환경공학회 2012 Environmental Engineering Research Vol.17 No.-
Trihalomethanes (THMs) formation and species distribution in the discharged chlorinated cooling seawater of a nuclear power plant was assessed during Aug 2010 to July 2011. The monthly variation of chlorine demand of the source seawater under laboratory chlorination conditions was studied for the same period. The entire period can be divided into two separate zones; viz. Feb, Mar, Apr, Sep, Oct (low chlorine demand), and May, Jun, Jul, Aug, Nov, Dec, Jan (high chlorine demand) months. Bromoform was found to be the single dominant THMs species in the chlorinated cooling seawater discharge. The THMs concentration was observed to be highest for the month of Nov 2010 (41 μg/L), and lowest for Feb 2011(12 μg/L). Under laboratory chlorination of intake seawater with 1 ppm Cl2, the concentration of THMs that was formed within 5–15 min is in agreement with the actual concentration in the discharge water. A simplified predictive approach is proposed for the total THMs concentration at the cooling discharge outlet of a power plant, based on the actual chlorine demand of source water.
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Dielectric and Frequency Dependent Transport Properties of Gadolinium Doped Bismuth Ferrite
A. K. Sahu,S. K. Satpathy,S.K. Rout,Banarji Behera 한국전기전자재료학회 2020 Transactions on Electrical and Electronic Material Vol.21 No.2
Ceramics of (Bi 1−x Gd x FeO 3 ) [x = 0.5, 0.6 and 0.7] were synthesized through mixed oxide method. Structural studies of the ceramics were done using X-ray diff raction technique. At high frequency, nearly flat response in the dielectric constant and dielectric loss with temperature up to 200 °C were observed. Dielectric constant found to increase with decrease in Gadolinium concentration. Frequency dependent electrical data analysis at diff erent temperatures suggested a temperature dependent non-Debye type relaxation process in the ceramics. Frequency dependence AC conductivity at different temperatures obeyed Jonscher’s universal power law. The temperature dependence of DC and AC conductivity was fitted with Arrhenius equation. The activation energies at different temperature ranges were calculated to understand the conduction process.
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Priyambada Mallick,A. K. Sahu,Susanta Ku. Biswal,S. K. Satpathy,Banarji Behera 한국전기전자재료학회 2022 Transactions on Electrical and Electronic Material Vol.23 No.5
Synthesis of polycrystalline samples of Bi 1–x R x FeO 3 (R = Nd, Gd and La) with x = 0.5, 0.6, 0.7 and 0.8 were demonstrated through solid-state reaction method at high temperature. The X-ray diffraction technique confirmed the orthorhombic phase of the samples and structural parameters like microstrain, crystallinity percentage, and dislocation density of the composites were calculated using an approximation method from XRD data. A negative temperature coefficient of resistance (NTCR) behavior of all the samples at various temperatures was confi rmed from the variation of resistance with temperature. The inverse dependence of dielectric constant with a doping concentration of rare earth metal was identified. Bismuth ferrite with dopants Nd, La, and Gd was found to have the potential to be used as an NTC Thermistor by enhancing the value of thermistor constant (β), sensitivity factor (α), and stability factor.
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Satya Panigrahi,Ajit K. Mohanty,Thanapandi Ramesh,K. Jahir Hussain,Manoj K. Samantara,M. V. R. Prasad,Kamala Kanta Satpathy 대한환경공학회 2012 Environmental Engineering Research Vol.17 No.-
The present study aims to observe the post tsunami changes occurring in a small lake. Physicochemical and biological characteristics of Kokilamedu lake (KKM) revealed drastic changes when compared to the pre-tsunami conditions. The monthly average water quality indicated that salinity was increased sharply (11.31 practical salinity unit [psu] in June 2008) from a lowest pre-tsunami value of 1.19 psu (range, 1.19 to 3.41 psu). Similarly, the NO3+NO2 values were increased significantly (0.49 μmol/L in 1996 to 74.47 μmol/L in 2006). The concentration of SiO4 increased remarkably from an average of 64.87 μmol/L during pre-tsunami conditions to 309.71 μmol/L during post-tsunami conditions (2009–2010). Inorganic phosphate was also increased to a maximum of 9.59 μmol/L from a pre-tsunami maximum of 1.09 μmol/L. Chlorophyll-a values did not respond to the increased nutrient stoichiometry and declined during posttsunami conditions. However, there was a significant improvement in oxygen concentration (2006–2010 average, 8.27 mg/L) of the lake compared to the 1996 values (1994–1995 average, 5.94 mg/L). The algal component is now dominated by the blue-green algae which prevailed over the green algae in the pre-tsunami conditions. Certain marine fishes adapted to this altered ecosystem due to a probable regime shift. Remarkably, out of 20 species, five were marine, nine were brackish, and the remaining six were freshwater species. Preand post-tsunami observations from a control site did not exhibit a remarkable shift during 1994–1996 and 2010, whereas a shift was apparent in the case of KKM.
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