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- 저자 : Devi Pooja (검색결과 2 건)
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Temporal multifractal analysis of extreme events in the crude oil market
Devi Pooja,Kumar Sunil,Kumar Pawan,Kumar Sushil,Khan Imran,Kumar Pawan 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.81 No.4
The ‘crude oil price’ has been one of the integral components of rising globalization. This paper delves into the static and dynamic multifractal analysis of daily prices of Brent crude oil for the period of 33 years (1987–2020) using the multifractal detrended fuctuation analysis. We discuss the results and limitations of the static multifractal analysis of historical data of crude oil. The crude oil market contains much more complexity in its dynamics that needs to be examined to draw inferences. These are important for socio-economic and political policy formulation at the global level. Thus the temporal multifractal analysis of historical data of crude oil is performed to understand such complexity. Further, the efect of extreme events on the multifractal properties of the crude oil market is also investigated. It is shown that multifractal spectra evolve through diferent shapes with time and the multifractal asymmetry coefcient can be used as an indicator in the detection of extreme events.
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Shelly Singla,Soumen Basu,Pooja Devi 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.118 No.-
A hydrothermal approach (environmentally safe route) was followed to synthesize eco-friendly, nontoxic,sunlight responsive 2D/2D BiVO4/SnS2 (BVSNS) nanocomposites with varying mole ratios. BVSNSexhibits favorable band gap, high charge carrier mobility, good surface area, lower recombining capabilityrendering it highly efficient photocatalyst. The superiority of photocatalysts was then tested for thedegradation of pharmaceutical pollutants, ofloxacin (oflox) and tetracycline (TC), and photoelectrocatalytic(PEC) water splitting under sunlight illumination. The 1:3 BiVO4:SnS2 (13BVSNS) composite hadhighest decomposition efficiency of 93.7 and 80.8 % with rate constants of 0.0164 and 0.010 min1 foroflox and TC-degradation, respectively. The GC–MS analysis was also conducted to examine the intermediatesand products formed during the photocatalytic degradation of TC. The PEC water splitting experimentsrevealed that 13BVSNS photoanode exhibited highest photocurrent density of 0.21 mA/cm2 at1.23 V vs RHE. The Mott-Schottky experiments demonstrated flat band potential of -0.37 V at 1.23 Vvs RHE for the 13BVSNS electrode. As a result, 21 lmolcm2sec-1 of H2 was produced and electrodewas stable for 6 h. Reusability studies (7 runs) were used to further examine the photocatalyst’s efficacy,and post reaction characterization results justified that the materials are highly stable with a long life.
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