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Amir Mohammad Nazari,James McNeice,Ahmad Ghahreman 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.59 No.-
The extraction of heavy rare earth elements (HREE) from a dilute leach solution using current routes poses crucial challenges including solvent loss, high solvent consumption, and phase disengagement difficulties for rare earth industry. This study proposes the selective extraction of HREE from dilute solutions using the ultrasonically-generated Cyanex 572 oil droplets (UGCOD) and Cyanex 572-impregnated resin (CIR). Oil/water (O/W) emulsion (EM) is a colloidal suspension, which is composed of micron and sub-micron sized oil droplets introducing a very high interfacial surface area in the aqueous solution. Sodium dodecyl sulfate (SDS) and hexadecyl trimethyl ammonium bromide (HTAB)-coated Cyanex 572 oil droplets were synthesized to investigate the impact of surfactant dosage on the zeta potential of EM, droplet size distribution, and extent of selective HREE extraction. Fourier transform infrared (FTIR) results clearly showed that the cation-exchange mechanism is involved in rare earth elements (REE) ions extraction by Cyanex 572 oil droplets. However, the addition of cationic and anionic surfactants markedly changed the REE extraction trend, which was due to the electrostatic interaction between REE ions and the outer charged layer formed at the surface of droplets. EM showed very fast HREE extraction compared to that of CIR and solvent extraction (SX).
Cholangiocarcinoma: An-eight-year Experience in a Tertiary-Center in Iran
Mohammad-Alizadeh, Amir Houshang,Ghobakhlou, Mehdi,Shalmani, Hamid Mohaghegh,Zali, Mohammad Reza Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.11
Background and Aim: Cholangiocarcinoma (CCA) is an uncommon malignancy of the bile duct, occurring in nearly 2 out of 100,000 people. It is a type of adenocarcinoma that originates in the mucous glands of the epithelium, or surface layers of the bile ducts. The aim of this study was to evaluate the clinical features, diagnostic results and factors associated with survival, morbidity and mortalityof cholangiocarcinoma cases in Iranian patients. Method: In this retrospective study the hospital medical records of 283 patients with a primary or final diagnosis of cholangiocarcinoma who had been admitted to gastroenterology ward of our hospital from 2004 to 2011 were retrospectively reviewed. Results: 283 patients (180 male, 63%, and 103 female, 38.6%) with a mean age of $59.7{\pm}14.4$ years were studied. The most frequent symptoms were painless jaundice (190, 66.9%), abdominal pain (77, 27%), pruritus 133 (46.8%) and weight loss (169, 59.5%). The most frequent associated risk factors and diseases were as follows: gallstones (72, 25.4%), diabetes (70, 24.6%), HBV infection (52 (18.3%), HCV infection 43 (15%), primary sclerosing cholangitis (16, 5.6%) and smoking (120, 42.3%). The most frequent type of cholangiocarcinoma in ERCP and MRCP was hilar. The mean survival time was $7.42{\pm}5.76$ months. Conclusion: The mean survival time in our study was lower than one year. Moreover the most frequent risk factors and associated diseases were smoking, gallstones and diabetes. Painless jaundice, abdominal pain and weight loss were the most clinical features related to cholangiocarcinoma. Additionally survival time did not correlate with risk factors, associated diseases and clinical presentations, but was linked to biliary metallic stenting and surgery.
Amir Mohammad Mansouri,Ali Akbar Zinatizadeh,Mohsen Irandoust,Aazam Akhbari 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.1
Simultaneous removal of carbon and nutrients from a synthetic wastewater in aerobic/anoxic sequence batch reactor (SBR) was investigated. The experiments were conducted based on a central composite design (CCD)and analyzed using response surface methodology (RSM). Two significant independent variables, cycle time and aeration time, were studied to analyze the process. Five dependent parameters--total COD (TCOD) removal, total nitrogen removal,total phosphorus removal, total Kjeldahl nitrogen removal and effluent nitrate concentration--were monitored as the process responses. The region of exploration for the process was taken as the area enclosed by cycle times (2,4.25 and 6.5 h) and aeration times (30, 40 and 50 min/h) boundaries. The maximum COD (87.18%) and TKN (78.94%)removal efficiencies were obtained at the cycle time and aeration time of 6.5 h and 50 min/h, respectively. While the maximum TN (71.15%) and phosphorus (68.91%) removal efficiencies were obtained at cycle time of 6.5 h and aeration time of 40min/h. As a result, high cycle time (6.5 h) and moderate aeration time (40min/h) were found to be the optimal region for maximum carbon and nitrogen removal efficiencies.
Formulation of elastic modulus of concrete using linear genetic programming
Amir Hossein Gandomi,Amir Hossein Alavi,Mohammad Ghasem Sahab,Parvin Arjmandi 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.6
This paper proposes a novel approach for the formulation of elastic modulus of both normal-strength concrete (NSC) and high-strength concrete (HSC) using a variant of genetic programming (GP), namely linear genetic programming (LGP). LGP-based models relate the modulus of elasticity of NSC and HSC to the compressive strength, as similarly presented in several codes of practice. The models are developed based on experimental results collected from the literature. A subsequent parametric analysis is further carried out to evaluate the sensitivity of the elastic modulus to the compressive strength variations. The results demonstrate that the proposed formulas can predict the elastic modulus with an acceptable degree of accuracy. The LGP results are found to be more accurate than those obtained using the buildings codes and various solutions reported in the literature. The LGP-based formulas are quite simple and straightforward and can be used reliably for routine design practice.
Modeling and Analyzing One Vendor-Multiple Retailers VMI SC Using Stackelberg Game Theory
Amir-Mohammad Golmohammadi,Negar Jahanbakhsh Javid,Lily Poursoltan,Hamid Esmaeeli 대한산업공학회 2016 Industrial Engineeering & Management Systems Vol.15 No.4
Game theory is a powerful tool for analyzing the Supply chain (SC) with different conflicting elements. Among them, the Stackelberg game is the one in which a player as leader has more power than the other ones as followers. Since in many SC systems one element has, in essence, more power than the others; the Stackelberg game has found many applications in SC studies. In this paper, we apply the Stackelberg game-theoretic approach and the corresponding equilibrium point to formulate and analyze a two echelon VMI SC. Comprehensive computational results on an experimental case are conducted to numerically analyze the performance of VMI system against three groups of critical parameters. Moreover, a critical comparison demonstrates the poorer performance of decentralized VMI system than centralized one. This naturally necessitates designing proper contracts between VMI partners in order to more effectively implement the realistic decentralized system.
Mohammad Khaksari,Gholamreza Asadikaram,Amir Rahnema,Mehdi Mahmoodi,Gholamhosein Hasanshahi,Mohammad Hashemi,Mohammad Khaksari 대한약리학회 2011 The Korean Journal of Physiology & Pharmacology Vol.15 No.6
It has been shown that some opium derivatives promote cell death via apoptosis. This study was designed to examine the influence of opium addiction on brain and liver cells apoptosis in male and female diabetic and non-diabetic Wistar rats. This experimental study was performed on normal, opium-addicted, diabetic and diabetic opium-addicted male and female rats. Apoptosis was evaluated by TUNEL and DNA fragmentation assays. Results of this study showed that apoptosis in opium-addicted and diabetic opium-addicted brain and liver cells were significantly higher than the both normal and diabetic rats. In addition, we found that apoptosis in brain cells of opium-addicted and diabetic opium-addicted male rats were significantly higher than opium-addicted and diabetic opium-addicted female, whereas apoptosis in liver cells of opium-addicted and diabetic opium-addicted female rats were significantly higher than opium-addicted and diabetic opium-addicted male. Overall, these results indicate that opium probably plays an important role in brain and liver cells apoptosis, therefore, leading neurotoxicity and hepatotoxicity. These findings also in away possibly means that male brain cells are more susceptible than female and interestingly liver of females are more sensitive than males in induction of apoptosis by opium.
The effect of sonication power on the sonochemical synthesis of titania nanoparticles
Amir Hassanjani-Roshan,Seyed Mohammad Kazemzadeh,Mohammad Reza Vaezi,Ali Shokuhfar 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.3
Titanium dioxide (TiO2) nanoparticles were synthesized by a sonochemical method. C12H28O4Ti (Tetraisopropyl titanate),ethanol (C2H5OH), sodium hydroxide (NaOH) and deionized water were used as the initial materials. The output power of the ultrasonic device plays the most important role in the size and morphology of the final products. Sonochemical processes at different sonication power were carried out at synthesis temperature (50 oC) for 1.5 h and then the materials were washed and dried at room temperature for 48 h. To determine the particle size and also evaluate the morphological properties, X-ray diffraction (XRD) and transmission electron microscopy (TEM) were used. TG/DTA analysis was used to for determine the temperature and time of crystallization. From TEM observations the size of titanium dioxide nanoparticles is estimated to be significantly smaller than ~12 to ~30 nm.
A Metaheuristic for the Containership Feeder Routing Problem with Port Choice Process
Mohammad VAFERI,Mohammad Saied FALLAH,Amir Hossein TAYEBI 한국해운물류학회 2018 The Asian journal of shipping and Logistics Vol.34 No.2
In this paper, we focus on understanding the joint problem of container ship route generation and consolidation center selection, two important sub-problems influencing the effectiveness of the liners shipping industry, which addresses the ship-routing problem. Two different metaheuristics procedures are presented that both consist of two stages: a solution construction phase (either nearest neighborhood with greedy randomize and Clark and Wright with greedy randomize selection) and a solution improvement phase, based on local search. Both metaheuristics are compared in terms of quality of solution, robustness analysis and computing time under variety of instances, ranging from small to large. A thorough comparison evaluation uncovers that both metaheuristics are close-to-each other. An argument in favor of the nearest neighborhood with greedy randomize approach is that it produces better performance than Clark and Wright configuration. Additionally, through sensitivity analysis, we investigate and test two hypotheses in this paper.