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- 저자 : Sudipta Sarkar (검색결과 2 건)
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Sarkar Tanmay,Salauddin Molla,Choudhury Tanupriya,Um Jung-Sup,Pati Siddhartha,Hazra Sudipta Kumar,Chakraborty Runu 대한공간정보학회 2021 Spatial Information Research Vol.29 No.4
Being a seasonal fruit mango cannot be cherished over the year; dehydration may be a solution to preserve the deliquesce of mango as mango leather. The processing parameters like puree load (0.4–0.6 g/cm2 ), total soluble solid (20–30 B), oven temperature (60–80 C), and microwave power level (100–300 W) were optimised for a superior textural attribute (hardness) primitive drying method like sun drying, industrially practiced modern methods like hot air oven drying and microwave drying and cutting-edge drying technique like freeze-drying. Response surface methodology and artificial neural network technique were adapted to model these drying procedures by considering the central composite design. The mathematical operations guiding to describe the model were studied. Being an imperative parameter colour quantification is essential for food industries. Current research employs microwave drying to produce mango leather with colour quantification approach. The L, ‘a’ and ‘b’ values of the product have been measured by Hunter Lab colorimeter and by digital image analysis, to determine the chromatic view harmonious to human vision. The relative analysis of colour measurement through these two techniques has been studied.
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Renuka Verma,Pradip K. Maji,Sudipta Sarkar 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.111 No.-
Prolonged exposure to trace Cr(VI) concentrations in potable water can cause serious health problems inliving beings. A weak base anion exchange resin, Duolite A7, showed a large capacity for trace Cr(VI)removal from a background of competing anions present at much higher concentrations, while conventionalion exchangers and adsorbents become ineffective due to lack of selectivity under similar conditions. The objective of this study was to find out the mechanism behind such significant capacityshown by the resin. Fixed-bed column studies showed that the resin was fully exhausted below 4,000bed volumes (BVs) for pH 7, whereas no breakthrough was observed for 25,000 and 131,000 BVs at pH5 and 3, respectively. Extensive characterization studies revealed that redox reactions were also occurringinside the resin in addition to ion exchange, where Cr(VI) oxidized the amine functional groupsand phenol–formaldehyde matrix while itself getting reduced to Cr(III). Cr(III) formed was either precipitatedinside the resin as Cr(OH)3 or bound with the oxidation products such as carboxylic acid groups. Analysis of treated water showed that formaldehyde, a carcinogen, was formed due to oxidative attackof Cr(VI) on the resin and was released in the effluent at trace concentrations. A detailed understandingof the mechanism would motivate the development of such redox-active sorbents for selective trace Cr(VI) removal from contaminated drinking water.
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