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Mohammad Bagher Nasiri,Masoud Behzadinejad,Hamidreza Latifi,Jukka Martikainen 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.8
Arc efficiency of Gas Tungsten Arc Welding (GTAW) was determined by calorimetric method. A water-cooled anode calorimeterwas designed and manufactured to measure the arc thermal efficiency, which was determined as a function of current, arc length, polarityand gas flow rate for GTAW of mild steel. With Direct Current Electrode Negative (DCEN) polarity and 5 mm arc length, a thermalefficiency of 67±4% was obtained, which was independent of the welding current. With Direct Current Electrode Positive (DCEP) polarityand 5 mm arc length, arc thermal efficiency was determined as 52±4%. The experimental data show that the arc efficiency decreasesfrom 67% to 58% and 51% as the arc length increases from 5 mm to 11 and 17.5 mm, respectively. The experimental results also showthat the arc efficiency is not significantly affected by the shielding gas flow rate.
Mohammad Saber Karambeigi,Masoud Nasiri,Ali Haghighi Asl,Mohammad Ali Emadi 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.39 No.-
The positive feedback from previous studies has confirmed the high performance of microemulsionflooding. However, there are few researches assessing this efficient method in carbonates reservoirs,particularly at high temperature. This paper attempts to fill the gap. Furthermore, biodiesel is introducedand evaluated as a new hydrocarbon source of mixture. For this purpose, phase behavior of surfactant/brine/biodiesel/co-solvent was systematically studied using response surface methodology to find theoptimum formulation. Thereafter, optimized microemulsion was characterized in terms of particle sizedistribution, zeta potential, electrical conductivity, polarized light microscopy, surface tension,interfacial tension, and viscosity. Finally, oil recovery tests comprising spontaneous imbibition, contactangle, core-flood and microvisual experiments were conducted to examine the potential of optimumformulation for chemical enhanced oil recovery (CEOR) purpose in carbonates. Experiments of differentstages were carried out at elevated temperature (75 8C). Employing optimal microemulsion, 20.0%original oil in place (OOIP) in spontaneous imbibition and 6.4% OOIP in core-flood tests were tertiaryadded to oil recovery. The results of this study illustrate the efficacy of proposed formulation to increaseoil recovery factor of carbonate formations.
Mirinezhad, Seyed Kazem,Somi, Mohammad Hossein,Shirmohamadi, Masoud,Seyednejad, Farshad,Jangjoo, Amir Ghasemi,Ghojazadeh, Morteza,Mohammadzadeh, Mohammad,Naseri, Ali Reza,Nasiri, Behnam Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.6
Background: To investigate the role of surgical treatment for locally advanced esophageal cancer, we compared the outcomes of chemoradiotheroy alone (CRT) to postoperative chemoradiotherapy (S/CRT), using, Regional Radiotherapy Center, database. Materials and Methods: This retrospective study was conducted in North-West of Iran, included of 255 consecutive patients with esophageal cancer. Eligible operable and non-operable, were treated with S/CRT and CRT respectively. Radiotherapy (RT) was delivered at 1.8-2 Gy/day for five consecutive days in a given week. Chemotherapy (CT) consisted of cisplatin and 5-fluorouracil. Results: From March 2006 to March 2011 255 patients: male/female 129/96, median age 68 (35-90), squamous/adeno 213/12, received CRT/S+CRT 166/59, median radiation dose $45{\pm}13.6Gy$, Median survival 13.5 (11-15), overall survival (OS) One/Two/Three 57/21/16%, Died/alive 158/97, Univariate analysis prognostic factors: age/stag/differentiation/dose of RT/fraction/treatment, Multivariate analysis predictor factor: dose of RT/fraction. Conclusions: Although this treatment offers some possibility for improvement of patients with esophageal cancer, there remains a significant need for development of new drug and new therapeutic approaches that can substantially impact survival.