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고교 육상 선수의 심리상태에 관한 연구
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The Relative Influence of Diet and Physical Activity on Obesity in China
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The Formula for Health and Well-Being in Individuals With Cerebral Palsy: Cross-Sectional Data on Physical Activity^ Sleep^ and Nutrition
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En mann i 30-arene med icterus og kloe
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Ultrawideband current sensor based on the Faraday effect in semimagnetic semiconductors [2374-27]
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Testosterone action on BFU-E and CFU-E: correlation between enhancement of proliferative rate and amplification of pool size
- 검색키워드
- 저자 : Mohammad Reza Mehrnia (검색결과 4 건)
- 무료
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Mohammad Reza Mehrnia,Shima Javdaneh,Maryam Homayoonfal 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.11
The aim of this research was to synthesize a polysulfone/Zinc oxide nanocomposite membrane (PSf/ZnO NCM) in order to mitigate membrane fouling. ZnO nanoparticles with an approximate size of 20 nm were blended with PSf matrix. To fabricate an efficient PSf/ZnO NCM, polyethylene glycol and polyvinyl pyrrolidone were used as pore former agent, based on which PEG-NCMs and PVP-NCMs were fabricated. The effect of the type of pore former and concentration of nanoparticles was evaluated on the structure and performance of nanocomposite membrane. According to SEM images, with the increase in the concentration of nanoparticles, membrane porosity grew as well. AFM analysis confirmed increased roughness with contact angle measurement showing enhanced hydrophilicity. The filtration performance implied that the presence of ZnO nanoparticles improves water flux. Moreover, ZnO nanoparticles elevated humic acid rejection up to 99.7% and 94.2% and decreased total filtration resistance up to 89% and 30% for PEG-NCMs and PVP-NCMs, respectively.
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Mitra Bayat,Mohammad Reza Mehrnia,Mostafa Hosseinzadeh,Reza Sheikh-Sofla 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.25 No.-
This study aims to investigate the technical feasibility of employing membrane bioreactor (MBR) as a practical approach for ethylene oxide/ethylene glycol (EO/EG) and olefin units wastewater treatment in a petrochemical complex. EO/EG unit wastewater mainly contains ethylene glycol and acetaldehyde and olefin unit wastewater includes benzene and ethyl benzene, with COD concentration of 1900 900 mg/L and 900 300 mg/L, respectively. Experimental studies of MBR pilot plants with volume of 2.5 m3 were carried out during 6 months in different HRTs and various mixed ratios of EO/EG to olefin unit wastewater. Results revealed that using MBR, COD removal efficiency of 97.5% is accomplished in HRT of 13.5 h for EO/EG and 85% in HRT of 18 h for olefin wastewater. For the mixed ratio of 2/1 and in HRT of 18 and 24 h, COD removal efficiency of 93.5% and 96% was achieved, respectively. Membrane fouling was analyzed at different MLSS concentrations. The results at optimum MLSS of 8 g/L revealed that fouling resistance is mainly due to the membrane pore blocking, and cake and gel resistances contribute less to membrane fouling. Results indicated that MBR is a promising technology for treatment of high fluctuation toxic components in petrochemical wastewater.
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Maryam Homayoonfal,Mohammad Reza Mehrnia,Samane Rahmani,Yasaman Mohades Mojtahedi 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.22 No.-
In this study, polysulfone/alumina nanocomposite membranes were synthesized with the principal aimof reducing biofouling in membrane bioreactors. The filtration experiments indicate that aluminananoparticles can increase water flux by enhancing membrane hydrophilicity while maintaining theseparation efficiency through decreasing porosity. Altogether, as confirmed by AFM images, thedevelopment of roughness results in biofilm formation reduction on the membrane surface layer. Onthe whole, presence of alumina nanoparticles up to the polymer concentration of 0.03 wt.% will result inan augment in separation yield up to 7%, four times higher water flux, and 83% reduction in membranefouling.
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Sepideh Ghorbani,Fatemeh Tabandeh,Bagher Yakhchali,Mohammad Reza Mehrnia 한국생물공학회 2011 Biotechnology and Bioprocess Engineering Vol.16 No.5
A cell surface display system with metalbinding properties was previously developed using CS3fimbriae, which are hollow tubes 20 nm-thick and 2 nm in diameter. In this study, hybrid CS3 pili were separated from recombinant Escherichia coli and entrapped in calcium alginate gel beads in order to improve their stabilization and also adsorption of heavy metals. The surface morphology of the gel beads containing pili was investigated by scanning electron microscopy (SEM). Immunofluorescence microscopy was employed to confirm the attachment of nanobiofibers to the alginate beads. The effects of three variables (sodium alginate concentration,protein to alginate mass ratio, and bead size) at two levels each on Cd^(2+) biosorption efficiency were investigated by full factorial experimental design. A second-order polynomial equation modeled the design space for the process response of cadmium removal capacity. The optimal values of the factors were obtained as follows: 1% sodium alginate concentration, 0.25 protein to alginate mass ratio,and a 6 mm bead size. Under these conditions, Cd^(2+) was adsorbed at 45.45 mg/g to the nanobiofiber. The results indicate that the immobilized recombinant hybrid CS3 pili may be an appropriate biosorbent for removal of heavy metals from polluted aquatic environments.
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