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Application of fuzzy RES and fuzzy DEMATEL in the rock behavioral systems under uncertainty
Ramin Rafiee,Sadjad Mohammadi,Mohammad Ataei,Reza Khalookakaie 한국자원공학회 2019 Geosystem engineering Vol.22 No.1
Most of the mine design methods, especially in underground mining depend on the rock mechanics and thus, they are based on rock behavioral systems. Existence of uncertainty in the rock physical and mechanical parameters leads this assessment to be impossible. In such situation, the system thinking methods can be useful. The aim of this paper is to apply system thinking-based techniques for assessment of the rock mass cavability in block caving mines. For this purpose, fuzzy rock engineering system (FRES) and the decision-making trial and evaluation laboratory (FDEMATEL) methods are used to investigate caving behavioral system. The interrelationships and structure of the parameters involved in the rock mass cavability were determined by these methods. In addition, the parameters were categorized from causality point of view and ranked due to their importance. Finally, two methods were compared in the studying a complex system like the cavability of rock masses from their advantages and disadvantages point of view. This study shows that such analysis is useful in practice to better understanding rock behavior and its impact on the working space regard to the safety and the productivity.
On The Stiffness Prediction of GFRP Pipes Subjected to Transverse Loading
Roham Rafiee,Mohammad Reza Habibagahi 대한토목학회 2018 KSCE Journal of Civil Engineering Vol.22 No.11
The main objective of this study is to predict the stiffness of GFRP pipes subjected to compressive transverse loading. An experimental study is performed to measure the stiffness of a composite pipe with a core layer of sand/resin composites. Then, a simple analytical modeling constructed on the basis of solid mechanics is used to estimate the stiffness of the investigated pipe as the back-of-envelope technique widely used by industrial sectors. The simulation of stiffness test is conducted using finite element modeling wherein both large deformation and inelastic behavior of material is taken into account as the sources of nonlinearity. The results reveal that a very good estimation with high level of accuracy can be reached by proper selection of the element and performing nonlinear analysis.
Role of CODPCP/CODTotal ratio on p-chlorophenol toxicity towards aerobic granular sludge
Alireza Mesdaghinia,Mohammad Hossein Ghahremani,Ramin Nabizadeh,Simin Nasseri,Mohammad Rafiee 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.54 No.-
Aerobic granular sludge (AGS) has emerged as a promising biotechnology for the treatment of industrial wastewaters. The biodegradation of AGS utilizing p-chlorophenol (PCP) was investigated under various CODPCP/CODTotal ratios. The initially developed microbial granules were used for degradation of PCP, with monoethylene glycol (MEG) as co-substrate. Heterotrophic bacteria in AGS appeared to adapt fairly rapidly to PCP, and a near complete recovery of their metabolic activity was noticed after about 4 d of exposure to high PCP levels (up to 400 mg/L). Nevertheless, CODPCP/CODTotal 0.648 did negatively affect granular sludge in terms of both morphology and biological activity.
Davoud Afshar,Farzaneh Rafiee,Mozhgan Kheirandish,Solmaz Ohadian Moghadam,Mohammad Azarsa 대한백신학회 2020 Clinical and Experimental Vaccine Research Vol.9 No.2
Purpose: N-acetylmuramoyl-l-alanine amidase known as lytA, is an immunogenic protein that plays an important role in the pathogenesis of Streptococcus pneumoniae. It is highly conserved among S. pneumoniae strains and is absent among other Streptococcus species. In the present study, the level of antibodies against the lytA recombinant protein was evaluated in healthy individuals’ sera. Materials and Methods: DNA was extracted from S. pneumoniae ATCC 49619 to amplify lytA gene by polymerase chain reaction assay. The lytA amplicon and pET28a vector were separately double digested using Nde-1 and Xho1 restriction enzymes and then ligated together with ligase enzyme. The recombinant plasmid was expressed in Escherichia coli BL21 strain and the lytA recombinant protein purified using nickel-nitrilotriacetic acid affinity chromatography. Western blot was carried to detect lytA recombinant protein. Sixty healthy individual’s sera (at three age groups: group 1, <2; group 2, 2–40; and group 3, 60–90 years old) were collected and the titers of anti-lytA antibodies were determined. Results: The lytA gene was highly expressed in E. coli BL21 host. The recombinant lytA protein was purified and confirmed by western blotting. Tukey test analysis showed that there were no significant differences among the age groups considering the anti-lytA titer of 10. However, at the anti-lytA titer of 60, significant differences were observed between group 1 vs. group 2 (p<0.001); group 1 vs. group 3 (p=0.003), and group 2 vs. group 3 (p=0.024). Conclusion: The lytA protein seems to be a highly immunogenic antigen and a potential target for developing vaccines against pneumococcal infections.
Shojaei, Abdollah Fallah,Rafie, Mahboubeh Delavar,Loghmani, Mohammad Hassan Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.8
Cr(III) and Co(III) complexes with acetylacetonate were anchored onto a mesoporous MCM-41 through Schiff condensation. The materials were characterized by XRD, FT-IR, BET, CHN and ICP techniques. Elemental analysis of samples revealed that one C=N bond was formed through Schiff condensation on MCM-41 surface. The catalysts were tested for the alcohol oxidations using t-butyl hydroperoxide (TBHP) and $H_2O_2$ as oxidant. The catalytic experiments were carried out at both room temperature and reflux condition. Various solvents such as dichloromethane, acetonitrile and water were examined in the oxidation of alcohols. Among the different solvents, catalytic activity is found more in acetonitrile. Further, the catalysts were recycled three times in the oxidation of alcohols and no major change in the conversion and selectivity is observed, which shows that the immobilized metal-acetylacetonate complexes are stable under the present reaction conditions.
Ali Akbar Babaei,Babak Kakavandic,Mohammad Rafiee,Fariba Kalantarhormizi,Ilnaz Purkaram,Ehsan Ahmadi,Shirin Esmaeili 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.56 No.-
Textile wastewater was treated using an enhanced simultaneous adsorption/oxidation process withmagnetic nanoparticles-functionalized carbon (MNPs@C) and H2O2, UV and ultrasonic (US). Bothfilmandpore-diffusion affect adsorption mechanisms were included in the adsorption process. The dyeadsorption was enhanced by oxidative degradation in the present of H2O2 with the suitability in order ofUV-Fenton > US-Fenton > Fenton. Catalytic potential of 47% was observed for MNPs@C/H2O2/UV system. For UV-Fenton system 94.8% removal of dye with minimal iron leaching was observed after 5 times ofrecycle. Increasing catalytic activity of MNPs@C on direct red 16 (DR16) degradation follows the order ofPMS > PS > H2O2.
Abdollah Fallah Shojaei,Mahboubeh Delavar Rafie,Mohammad Hassan Loghmani 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.8
Cr(III) and Co(III) complexes with acetylacetonate were anchored onto a mesoporous MCM-41 through Schiff condensation. The materials were characterized by XRD, FT-IR, BET, CHN and ICP techniques. Elemental analysis of samples revealed that one C=N bond was formed through Schiff condensation on MCM-41 surface. The catalysts were tested for the alcohol oxidations using t-butyl hydroperoxide (TBHP) and H2O2 as oxidant. The catalytic experiments were carried out at both room temperature and reflux condition. Various solvents such as dichloromethane, acetonitrile and water were examined in the oxidation of alcohols. Among the different solvents, catalytic activity is found more in acetonitrile. Further, the catalysts were recycled three times in the oxidation of alcohols and no major change in the conversion and selectivity is observed, which shows that the immobilized metal- acetylacetonate complexes are stable under the present reaction conditions.