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RISS 인기검색어
- 검색키워드
- 저자 : Karmakar Manas (검색결과 3 건)
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Manas Mahapatra,Mrinmoy Karmakar,Arnab Dutta,Nayan Ranjan Singha 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.9
Response surface methodology (RSM) optimized accelerator-to-sulfur (A/S) ratio was used to synthesize semi efficiently vulcanized styrene butadiene rubber (SBRSEV0) membrane possessing optimum balance between tensile strength (TS) and elongation at break (EAB). In addition, composite membranes, such as SBRSEV8, SBRSEV12 and SBRSEV24, were fabricated via incorporating 8, 12 and 24 wt% carbon black filler (CBF), respectively. The changes in physicochemical properties, as a result of crosslinking and CBF loading, were determined by analyzing CP MAS 13CNMR, FTIR, TGA, DSC, XRD, FESEM-EDX and crosslink densities. Several bi-/poly-sulfidic products, formed by crosslinking precursors of SBR in accelerated sulfur vulcanization, were examined to ascertain the unambiguous reaction mechanism. In this regard, an extensive density functional theory (DFT) based optimization was conducted to apprehend the relative variation in stabilities of several mono-/poly-crosslinked configurations by measuring dipole moments and ground state energies. Moreover, intrinsic membrane properties, such as partial permeabilities and diffusion coefficients, were measured at varying conditions. RSM was employed to optimize membrane efficiency resulting from individual and/or interactive effects of input variables. For the first time, systematic three-stage RSM based optimization (i.e., TS/EAB, total flux (TF)/separation factor (SF) and partial permeabilities) was used to ensure excellent balance between TS/EAB (5.78MPa/499.008% at 2.32 and 3.29 wt% of A and S, respectively), minimum TF/maximum SF (36.90 g m-2 h-1/202.46 at 35 oC, 0.97 wt% tetrahydrofuran (THF) and 24 wt% CBF) and minimum/maximum partial permeabilities of water/THF (2.94×10-8/4.64×10-8 Barrer at 35 oC, 0.97 wt% THF and 11.49 wt% CBF).
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Mrinmoy Karmakar,Manas Mahapatra,Nayan Ranjan Singha 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.5
Response surface methodology (RSM) optimized, semi efficiently vulcanized (SEV) and filled organophilic composite natural rubber (NR) membranes of varying physichochemical interactions were reported for sorption-diffusion- permeation based separation of tetrahydrofuran (THF) from binary aqueous mixtures. RSM was used to obtain optimum accelerator/sulfur (A/S) ratio required for crosslinking of nine membranes to find excellent balance of mechanical properties. These membranes were characterized by FESEM, AFM, EDX, XRD, DTG, TGA, DSC and FTIR. Vulcanized products formed from several crosslinking precursors of NR via radical and/or ionic paths were incorporated to impart an unambiguous reaction mechanism. RSM was also used to obtain optimum conditions (temperature/ concentration/filler) for total flux (TF) and separation factor (SF). Membrane intrinsic properties, like partial permeabilities (PPs), selectivities and diffusion coefficients (DCs) were also studied. NRSEV12 membrane showed excellent balance of TF (24.01±0.7 g m−2 h−1) and SF (118.8±4.16) at 0.97 wt% of THF in feed and 35 oC.
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Ghosh Debasis,Mandal Mrinal,Karmakar Manas,Mandal Dayamoy,Modak Partha,Ghosh Biswajit,Mandi Susanta,Haque Sk. Mafizul 대한공간정보학회 2021 Spatial Information Research Vol.29 No.5
Malnutrition is a global phenomenon in general and India is no exception. Present study was conducted to determine the prevalence of undernutrition among the Santal children of Ajodhya Gram Panchayat of Purulia district of West Bengal, India. Here, quality of life of the households of the studied research participants is also investigated to understand the role of quality of life in the prevalence of undernutrition. A total number of 307 children aged in between 5–10 years were evaluated using the standard anthropometric techniques, such as height-forage, weight-for-age and body mass index for-age to determine the prevalence of stunting, wasting and underweight conditions of the Santal tribal children. The nutritional status index of children and the quality of life index of those children’s households have also been calculated to perceive the relation between these two indices. A cluster analysis has also been performed to see the similarity in terms of nutritional level among the children across the mouzas of Ajodhya Gram Panchayat. The prevalence of stunting, wasting and underweight among the children is found to be 27.69%, 36.81% and 44.63% respectively. The overall prevalence of undernutrition is recorded 58.31%. The nutritional status index is calculated to be 0.488 (moderate) for children, while the quality of life index for households is computed as 0.199 (very poor). The study reveals the occurrence of undernutrition among children is closely associated with poor quality of life of households of Ajodhya. The chi-square tests indicate that no statistically significant variation (p\0.05) in the prevalence of undernutrition in between male and female children, and among the different age groups is observed.
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