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- 저자 : Ali Gharibi (검색결과 4 건)
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Ali Gharibi,Benyamin Akhlaghi,Mohsen Abbasi 대한환경공학회 2022 Environmental Engineering Research Vol.27 No.2
The present research introduces adsorption of sulfonated cobalt phthalocyanine catalyst (Europhtal) from the real wastewater that is produced in the mercaptan removal unit (Merox) of the third refinery, South Pars Gas Complex (SPGC), Assaluyeh, Iran. Therefore, novel low-cost natural zeolite modified with polyaluminium chloride (PAC) was investigated as an adsorbent for the treatment of Europhtal wastewater. Central composite design (CCD), as a set of response surface methodology (RSM), was applied to acquire optimum operational conditions such as contact time, pH, adsorbent dosage, and Europhtal concentration. Results showed that the removal percentage of Europhtal in the real wastewater was 93.4% at best operating condition consisting of a pH of 6.7, sonication time of 8 min, 0.035 g of adsorbent. The obtained results were evaluated by adsorption isotherms and kinetic parameters. It was found that the equilibrium data matched the Freundlich model acceptably, with the maximum experimental adsorption capacity of this model was 687.51 mg g<SUP>-1</SUP> at 301.15 K. From the kinetic data, it was revealed that the adsorption process followed the pseudo-second-order kinetic model. Furthermore, the obtained thermodynamic parameters such as ΔH°, ΔS°, and ΔG° imply the endothermic essence of adsorption proceeding spontaneously.
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Evaluation of Complications after Surgical Treatment of Thoracic Outlet Syndrome
Mohammad Ali Hosseinian,Ali Gharibi Loron,Yalda Soleimanifard 대한흉부외과학회 2017 Journal of Chest Surgery (J Chest Surg) Vol.50 No.1
Background: Surgical treatment of thoracic outlet syndrome (TOS) is necessary when non-surgical treatments fail. Complications of surgical procedures vary from short-term post-surgical pain to permanent disability. The outcome of TOS surgery is affected by the visibility during the operation. In this study, we have compared the complications arising during the supraclavicular and the transaxillary approaches to determine the appropriate approach for TOS surgery. Methods: In this study, 448 patients with symptoms of TOS were assessed. The male-to-female ratio was approximately 1:4, and the mean age was 34.5 years. Overall, 102 operations were performed, including unilateral, bilateral, and reoperations, and the patients were retrospectively evaluated. Of the 102 patients, 63 underwent the supraclavicular approach, 32 underwent the transaxillary approach, and 7 underwent the transaxillary approach followed by the supraclavicular approach. Complications were evaluated over 24 months. Results: The prevalence of pneumothorax, hemothorax, and vessel injuries in the transaxillary and the supraclavicular approaches was equal. We found more permanent and transient brachial plexus injuries in the case of the transaxillary approach than in the case of the supraclavicular approach, but the difference was not statistically significant. Persistent pain and symptoms were significantly more common in patients who underwent the transaxillary approach (p<0.05). Conclusion: The supraclavicular approach seems to be the more effective technique of the two because it offers the surgeon better access to the brachial plexus and a direct view. This approach for a TOS operation offers a better surgical outcome and lower reoperation rates than the transaxillary method. Our results showed the supraclavicular approach to be the preferred method for TOS operations.
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Babak Kakavandi,Ahmad Jonidi Jafari,Roshanak Rezaei Kalantary,Hamed Gharibi,Anvar Asadi,Ali Azari,Ali Akbar Babaei,Afshin Takdastan 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.10
Discharging the effluents of textile wastewaters into potable water resources can endanger the ecosystem, due to their reactivity, toxicity, and chemical stability. In this research, the application of powder activated carbon modified with magnetite nanoparticles (PAC-MNPs) as an adsorbent for removal of reactive dyes (Reactive black 5 (RB5) and reactive red 120 (RR120)) was studied in a batch system. The adsorption performance was evaluated as a function of temperature, contact time and different adsorbent and adsorbate concentrations. The levels of factors were statistically optimized using Box-Behnken Design (BBD) from the response surface methodology (RSM) to maximize the efficiency of the system. The adsorption process of both dyes was fit with the pseudo-second order kinetic and Langmuir isotherm models. The identified optimum conditions of adsorption were 38.7 oC, 46.3 min, 0.8 g/L and 102mg/L for temperature, contact time, adsorbent dose, and initial dyes concentration, respectively. According to the Langmuir isotherm, the maximum sorption capacities of 175.4 and 172.4mg/g were obtained for RB5 and RR120, respectively. Thermodynamics studies indicated that the adsorption process of the reactive dyes was spontaneous, feasible, and endothermic. After five cycles, the adsorption efficiency was around 84 and 83% for RB5 and RR120, respectively. A high value of desorption was achieved, suggesting that the PAC-MNPs have a good potential in regeneration and reusability, and also can be effectively utilized in industrial applications. PAC-MNPs also show a good anti-interference potential for removal of reactive dyes in dye-industry wastewaters.
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Milad Gashti,Rouhollah Mehdinavaz Aghdam,Amir Motallebzadeh,Farid Gharibi Asl,Reza Soltani,Ali Ashrafi,Hassan Balaei,Alireza Razazzadeh 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.12
In recent years, high entropy alloys (HEA) have gained much attention due to their high corrosion resistance and mechanicalproperties. As a target, a high entropy TiTaMoVZr alloy with a atomic ratio of 20% was cast. Following that, the Ti–6Al–4Vsubstrate was coated using the radio frequency magnetron sputtering technique. This process took place at a temperature of400˚C under two different atmospheres of argon and air. HEA thin films’ mechanical, biological, and corrosion propertieswere investigated. The biocompatibility of these films was evaluated by MTT (3-[4,5-dimethylthiazol-2-yl]-2,5 diphenyltetrazolium bromide) assay. Based on the results, these films formed an amorphous phase with a higher hardness than thesubstrate. Also, the wettability and roughness of the surface of the films were higher compared to the substrate, whichimproved cell viability and their adhesion to the films surface. Because of their chemical compositions and unique structures,the films were more corrosion resistant than Ti6Al4V substrates were obtained. SEM investigation showed that there weremore cracks on the surface of non-oxide high entropy films compared to the high entropy oxide deposit. The oxide film hadno visible cracks, and also the thickness of the oxide high entropy film was more significant than the non-oxide film, whichresulted in improved corrosion properties. Also, the Polarization resistance of the non-oxide (176 × 104Ω.cm2) and oxide(218 × 104Ω.cm2) films increased compared to the substrate (324 × 103Ω.cm2). Furthermore, the coated samples had higherYoung’s modulus and nanohardness than Ti6Al4V samples. This was attributed to the amorphous structure and the absenceof defects such as dislocations and slip planes in the coating. Cell viability was improved for coated samples, however,atmospheric change in coating conditions did not significantly affect this cell viability.
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