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- 저자 : Himadri Roy (검색결과 3 건)
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Prosanta Biswas,Surajit Patra,Himadri Roy,Chandra Sekhar Tiwary,Manas Paliwal,Manas Kumar Mondal 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.6
Effect of manganese (Mn) addition (0.0, 1.0, 2.0 and 3 wt%) on the microstructural morphology, hardness, tensile propertiesand fracture behaviour of the gravity cast eutectic Al–12.6Si alloy has been studied through XRD analysis, chemical analysis,optical metallography, FESEM analysis, energy dispersive spectroscopy analysis, hardness test, tensile test and quantitativephase analysis. As-cast Al–12.6Si–0.0Mn alloy has a non-uniformly distributed coarser and irregular shape primary andeutectic silicon particles inside the α-Al phase, and both the Si phase have very sharp corners. Whereas, the 1 wt% Mn addedalloy has uniformly distributed fine eutectic and primary Si particles with blunt corners. Further, the addition of 1.0 wt% Mnforms very few (0.26 vol %) irregular shape Al15(MnFe)3Si2 intermetallic phase within the α-Al phase and eutectic Si phase. But, 2.0 wt% and 3 wt% Mn added alloy has an irregular shape coarse plate-like Al15(MnFe)3Si2 intermetallic phase besidesthe primary and eutectic Si phase. The bulk hardness of the Al–12.6Si alloy is increased with an increase in Mn concentrationas the harder Al15(MnFe)3Si2 intermetallic phase forms and both the Si phase morphology modify. The microhardness ofthe constituent phases also varies with the change in Mn concentration in the alloy. The Mn addition improved the ultimatetensile strength, yield strength, and elongation (%) of the alloy. However, fractographs reveal that the brittle mode of fracturehas been increased due to the presence of a higher volume of brittle Al15(MnFe)3Si2 intermetallic in 2.0 and 3.0% Mn alloy. On the other hand, the amount of brittle and cleavage fracture of Si particles decreased, and ductile fracture with dimplesformation increased in 1.0 wt%Mn added alloy.
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Meena, Vinod Kumar,Ghatak, Himadri Roy The Korean Electrochemical Society 2022 Journal of electrochemical science and technology Vol.13 No.2
The study presents kinetics of degradation and mineralization of an anti-epileptic drug Lamotrigine (LAM) in the aqueous matrix by electrochemical advanced oxidation process (EAOP) on Ti/DSA (Ta<sub>2</sub>O<sub>5</sub>-Ir<sub>2</sub>O<sub>5</sub>) and Stainless Steel (SS) anodes using sodium sulphate as supporting electrolyte. On both the anodes, kinetic behaviour was pseudo-first-order for degradation as well as mineralization of LAM. On Ti/DSA anode, maximum LAM degradation of 75.42% was observed at an associated specific charge of 3.1 (Ah/litre) at a current density of 1.38 mA/cm<sup>2</sup> and 100 ppm Na<sub>2</sub>SO<sub>4</sub> concentration. Maximum mineralization attained was 44.83% at an associated specific charge of 3.1 (Ah/litre) at a current density of 1.38 mA/cm<sup>2</sup> and 50 ppm concentration of Na<sub>2</sub>SO<sub>4</sub> with energy consumption of 2942.71 kWh/kgTOC. Under identical conditions on SS anode, a maximum of 98.92% LAM degradation was marked after a specific charge (Q) of 3.1 (Ah/litre) at a current density of 1.38 mA/cm<sup>2</sup> and 100 ppm concentration of Na<sub>2</sub>SO<sub>4</sub>. Maximum LAM mineralization on SS anode was 98.53%, marked at a specific charge of 3.1 (Ah/litre) at a current density of 1.38 mA/cm<sup>2</sup> and 75 ppm concentration of Na<sub>2</sub>SO<sub>4</sub>, with energy consumption of 1312.17 kWh/kgTOC. Higher Mineralization Current Efficiency (MCE) values were attained for EAOP on SS anode for both degradation and mineralization due to occurrence of combined electro-oxidation and electro-coagulation process in comparison to EAOP on Ti/DSA anode due to occurrence of lone electro-oxidation process.
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Vulnerability or masculinity: Examining “Aesthetic Labor” from male fashion models’ perspective
Jie G. Fowler,Rongwei Chu,James W. Gentry,Himadri Roy Chaudhuri 한국마케팅과학회 2016 Journal of Global Fashion Marketing Vol.7 No.4
‘Masculinity’ is changing globally. We investigate the adjustments made by Chinese male models as they work in a domain that had previously belonged primarily to women. Using a liminal lens to view the models’ adjustments, the study discovered that they perceive themselves to be subordinated to other participants in the advertising industry: designers, makeup artists, directors, clients, and even female models. While the changing nature of ‘masculinity’ globally has created many more opportunities for male models, we found that the norms of the advertising industry require a major re-invention of the models’ self-perceptions of masculinity.
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