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RISS 인기검색어
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- 저자 : Manas Mahapatra (검색결과 4 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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Arabinda Meher,Manas Mohan Mahapatra,Priyaranjan Samal,Pandu R. Vundavilli 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.9
Abrasive wear behaviour of TiB2reinforced in-situ magnesium RZ5 alloy-based metal matrix composites was investigatedusing a pin-on-disc wear testing apparatus. The in-situ RZ5/TiB2 composite was synthesized through the self-propagatinghigh-temperature synthesis route. The microstructure of the composite revealed a near-uniform distribution of TiB2in magnesiummatrix. The abrasive wear behaviour on the base RZ5 alloy and TiB2reinforced composites were investigated in termsof weight loss and co-efficient of friction. The effect of varying applied load (10–30 N), sliding distance (1000–3000 m),and wt% of TiB2content on abrasive wear properties were analysed. The results indicated a higher wear loss of the materialswith increase in the applied load and sliding distance. Co-efficient of friction decreased with increase in the applied loadbut increased with increase in sliding distance. The morphology of the worn surface under different test conditions wasanalysed in terms of delamination, wear groove, oxide, and wear debris formation using field emission scanning electronmicroscope. Large flaky shape wear debris was noticed when the load applied is 30 N whereas equiaxed wear debris wasnoticed when the applied load is 10 N. Increase in sliding distance increased the contact temperature led to the formation ofthe oxide layer on the contact surface.
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Roychowdhoury Satyabrata,Bhakta Subhajit,Mahapatra Manas Kumar,Ghosh Saptarshi,Saha Sayantika,Konar Mithun Chandra,Sarkar Mihir,Nandi Mousumi 대한소아청소년과학회 2022 Clinical and Experimental Pediatrics (CEP) Vol.65 No.7
Background: During the coronavirus disease 2019 (COVID-19) pandemic, lung ultrasonography (US) has been gaining importance in pediatric intensive care and emergency settings for the screening, diagnosis, and monitoring of pulmonary pathology.Purpose: To describe the pattern of lung US changes in patients with COVID-19 pneumonia and its potential role in monitoring ventilated patients.Methods: This prospective observational study included children aged 1 month to 12 years with a confirmed diagnosis of COVID-19. Lung US was performed using a high-frequency linear probe (5–12 MHz) in all children with moderate/severe respiratory symptoms within 24 hours of admission and then daily until the patient required oxygen therapy. Lung involvement severity was assessed using lung US scores, while lung aeration improvement or deterioration was measured using lung ultrasound reaeration scores (LUSReS).Results: Of 85 children with moderate to severe disease, 54 with pulmonary disease were included. Of them, 50 (92.5%) had an interstitial pattern, followed by pleural line abnormalities in 44 (81.5%), reduced or absent lung sliding in 31 (57.4%), and consolidation in 28 (51.8%). A significantly higher lung US score (median, 18; interquartile range [IQR], 11–22) was observed in ventilated versus nonventilated patients (median, 9; IQR, 6–11). LUSReS improvement after positive end-expiratory pressure titration was positively correlated with improved dynamic lung compliance and oxygenation indices and negatively correlated with the requirement for driving pressure. Successful weaning could be predicted with 100% specificity if loss of LUSReS ≤ 5.Conclusion: Interstitial syndrome, fragmented pleural line, and subpleural microconsolidation were the most prevalent lung US findings in children with COVID-19 pneumonia. Thus, lung US may have the ability to monitor changes in lung aeration caused by mechanical ventilation and predict its successful weaning in children with COVID-19.
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