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- 저자 : Taherzadeh, Zahra (검색결과 5 건)
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R. Taherzadeh Mousavian,S. Behnamfard,A. Heidarzadeh,K. Taherkhani,R. Azari Khosroshahi,D. Brabazon 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.8
SiC ceramic nanoparticles were incorporated into the A356 aluminum matrix with different compositions using a combinationof stir casting and semisolid extrusion. The microstructure and mechanical properties of the produced nanocompositeswere evaluated. The results showed that the presence of Nickel acts as an appropriate metallic carrier for SiC nanoparticles,which causes uniform dispersion and spherical grains. Consequently, the coexistence of SiC nanoparticles and Nickelresulted in UTS of above 304 MPa and elongation of 5.8%. However, the addition of Titanium caused the formation offlake-like intermetallics, which decreased the elongation of the nanocomposites. The method introduced in this study forthe incorporation of SiC ceramic nanoparticles can be used as a promising process instead of conventional methods, whichare expensive and time-consuming.
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NEW OPTIMAL POWER MANAGEMENT STRATEGY FOR SERIES PLUG-IN HYBRID ELECTRIC VEHICLES
Erfan Taherzadeh,Shahram Javadi,Morteza Dabbaghjamanesh 한국자동차공학회 2018 International journal of automotive technology Vol.19 No.6
Recently Plug-in hybrid electric vehicles (PHEVs) have gained increasing attention due to their ability to reduce the fuel consumption and emissions. In this paper a new efficient power management strategy is proposed for a series PHEV. According to the battery state of charge (SOC) and vehicle power requirement, a new rule-based optimal power controller with four different operating modes is designed to improve the fuel economy of the vehicle. Furthermore, the teaching-learning based optimization (TLBO) method is employed to find the optimal engine power and battery power under the specified driving cycle while the fuel consumption is considered as the fitness function. In order to demonstrate the effectiveness of the proposed method, four different driving cycles with various numbers of driving distances for each driving cycle are selected for the simulation study. The performance of the proposed optimal power management strategy is compared with the rule-based power management method. The results verify that the proposed power management method could significantly improve the fuel economy of the series PHEV for different driving conditions.
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Reverse Micellar Extraction of Fungal Glucoamylase Produced in Solid-State Fermentation Culture
( Aliakbar Paraj ),( Morteza Khanahmadi ),( Keikhosro Karimi ),( Mohammad J. Taherzadeh ) 한국미생물 · 생명공학회 2014 Journal of microbiology and biotechnology Vol.24 No.12
Partial purification of glucoamylase from solid-state fermentation culture was, firstly, investigated by reverse micellar extraction (RME). To avoid back extraction problems, the glucoamylase was kept in the original aqueous phase, while the other undesired proteins/ enzymes were moved to the reverse micellar organic phase. The individual and interaction effects of main factors (i.e., pH and NaCl concentration in the aqueous phase, and concentration of sodium bis-2-ethyl-hexyl-sulfosuccinate (AOT) in the organic phase) were studied using response surface methodology. The optimum conditions for the maximum recovery of the enzyme were pH 2.75, 100 mM NaCl, and 200 mM AOT. Furthermore, the optimum organic to aqueous volume ratio (Vorg/Vaq) and appropriate number of sequential extraction stages were 2 and 3, respectively. Finally, 60% of the undesired enzymes including proteases and xylanases were removed from the aqueous phase, while 140% of glucoamylase activity was recovered in the aqueous phase and the purification factor of glucoamylase was found to be 3.0-fold.
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Sadegh Aghapour Aktij,Alireza Zirehpour,Arash Mollahosseini,Mohammad J. Taherzadeh,Alberto Tiraferri,Ahmad Rahimpour 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.81 No.-
Volatile fatty acids (VFAs) can be produced from fermentation/anaerobic digestion of wastes and are avaluable substrate for numerous applications, such as those related to the food, tanning, petrochemicals,pharmaceuticals, cosmetics, and chemicals industry. They are also inexpensive raw materials fordeveloping alternative sources of energy. However, the separation and purification of VFAs producedfrom fermented wastewaters are not straightforward goals, due to the low concentration of thesecompounds in the fermentation broths and owing to the complexity of these mixtures. Cost-effective andsustainable technologies must be developed to recover VFAs efficiently and allow their beneficial use. Inthis paper, a comprehensive review of VFAs recovery/purification methods is provided, with focus onmembrane-based processes. First, the VFAs production methods, application, and conventional processes(distillation, precipitation, adsorption, and extraction) for their recovery are briefly reviewed. Then, theability of various membrane-based techniques to separate and purify VFAs are evaluated and discussed indetail. This discussion includes the processes of microfiltration/ultrafiltration, nanofiltration, reverseosmosis, forward osmosis, membrane distillation, electrodialysis, membrane contractor, and pervapo-ration. Extensive background and examples of applications are also provided to show the effectiveness ofmembrane processes. Finally, challenges and future research directions are highlighted.
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Mansour-Ghanaei, Fariborz,Sokhanvar, Homayoon,Joukar, Farahnaz,Shafaghi, Afshin,Yousefi-Mashhour, Mahmud,Valeshabad, Ali Kord,Fakhrieh, Saba,Aminian, Keyvan,Ghorbani, Kambiz,Taherzadeh, Zahra,Sheykhia Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.4
Background & Objectives: Gastric cancer is a leading cause of cancer-related deaths in both sexes in Iran. This study was designed to assess upper GI endoscopic findings among people > 50 years targeted in a mass screening program in a hot-point region. Methods: Based on the pilot results in Guilan Cancer Registry study (GCRS), one of the high point regions for GC-Lashtenesha- was selected. The target population was called mainly using two methods: in rural regions, by house-house direct referral and in urban areas using public media. Upper GI endoscopy was performed by trained endoscopists. All participants underwent biopsies for rapid urea test (RUT) from the antrum and also further biopsies from five defined points of stomach for detection of precancerous lesions. In cases of visible gross lesions, more diagnostic biopsies were taken and submitted for histopathologic evaluation. Results: Of 1,394 initial participants, finally 1,382 persons (702 women, 680 men) with a mean age of $61.7{\pm}9.0$ years (range: 50-87 years) underwent upper GI endoscopy. H. pylori infection based on the RUT was positive in 66.6%. Gastric adenocarcinoma and squamous cell carcinoma of esophagus were detected in seven (0.5%) and one (0.07%) persons, respectively. A remarkable proportion of studied participants were found to have esophageal hiatal hernia (38.4%). Asymptomatic gastric masses found in 1.1% (15) of cases which were mostly located in antrum (33.3%), cardia (20.0%) and prepyloric area (20.0%). Gastric and duodenal ulcers were found in 5.9% (82) and 6.9% (96) of the screened population. Conclusion: Upper endoscopy screening is an effective technique for early detection of GC especially in high risk populations. Further studies are required to evaluate cost effectiveness, cost benefit and mortality and morbidity of this method among high and moderate risk population before recommending this method for the GC surveillance program at the national level.
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