http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Ketabi, Mahnam,Pirdashti, Mohsen,Mobalegholeslam, Poorya Korean Chemical Society 2019 대한화학회지 Vol.63 No.1
The new experimental data of liquid-liquid equilibrium (LLE) of aqueous two-phase system (ATPS) consisting of poly(ethylene glycol) 3000 + tri-potassium citrate at different pH were presented. It was found that an increase in pH resulted in the expansion of the two-phase region. The TLL and STL increased with increasing the pH values. The Merchuk equation can be appropriately employed to correlate the binodal curves and also the tie-line compositions were adjusted to both the Othmer-Tobias and Bancroft equations. In order to calculate the compositions of the phase and the ends of the tie-lines, density and refractive indices as two physical properties were used. Finally, the extended UNIQUAC, UNIFAC, Virial-(Mobalegholeslam & Bakhshi) and modified UNIQUAC-FV were used to measure the phase equilibria at different pH. The results of the models suggested that it can be used quite well to correlate the LLE in an aqueous solution of polymer-salt.
Optimization Shape of Variable-Capacitance Micromotor Using Seeker Optimization Algorithm
Ketabi, Abbas,Navardi, Mohammad Javad The Korean Institute of Electrical Engineers 2012 Journal of Electrical Engineering & Technology Vol.7 No.2
In the current paper, the optimization shape of a polysilicon variable-capacitance micromotor (VCM) was determined using the seeker optimization algorithm (SOA). The optimum goal of the algorithm was to find the maximum torque value and minimum ripple torque by varying the geometrical parameters. The optimization process was performed using a combination of SOA and the finite-element method (FEM). The fitness value was calculated via FEM analysis using COMSOL3.4, and SOA was realized by MATLAB7.4. The proposed method was applied to a VCM with eight and six poles at the stator and rotor, respectively. For comparison, this optimization was also performed using the genetic algorithm. The results show that the optimized micromotor using SOA had a higher torque value and lower torque ripple, indicating the validity of this methodology for VCM design.
Optimization Shape of Variable-Capacitance Micromotor Using Seeker Optimization Algorithm
Abbas Ketabi,Mohammad Javad Navardi 대한전기학회 2012 Journal of Electrical Engineering & Technology Vol.7 No.2
In the current paper, the optimization shape of a polysilicon variable-capacitance micromotor (VCM) was determined using the seeker optimization algorithm (SOA). The optimum goal of the algorithm was to find the maximum torque value and minimum ripple torque by varying the geometrical parameters. The optimization process was performed using a combination of SOA and the finite-element method (FEM). The fitness value was calculated via FEM analysis using COMSOL3.4, and SOA was realized by MATLAB7.4. The proposed method was applied to a VCM with eight and six poles at the stator and rotor, respectively. For comparison, this optimization was also performed using the genetic algorithm. The results show that the optimized micromotor using SOA had a higher torque value and lower torque ripple, indicating the validity of this methodology for VCM design.
Mahnam Ketabi,Mohsen Pirdashti,Poorya Mobalegholeslam 대한화학회 2019 대한화학회지 Vol.63 No.1
The new experimental data of liquid-liquid equilibrium (LLE) of aqueous two-phase system (ATPS) consisting of poly(ethylene glycol) 3000 + tri-potassium citrate at different pH were presented. It was found that an increase in pH resulted in the expansion of the two-phase region. The TLL and STL increased with increasing the pH values. The Merchuk equation can be appropriately employed to correlate the binodal curves and also the tie-line compositions were adjusted to both the Othmer-Tobias and Bancroft equations. In order to calculate the compositions of the phase and the ends of the tie-lines, density and refractive indices as two physical properties were used. Finally, the extended UNIQUAC, UNIFAC, Virial-(Mobalegholeslam & Bakhshi) and modified UNIQUAC-FV were used to measure the phase equilibria at different pH. The results of the models suggested that it can be used quite well to correlate the LLE in an aqueous solution of polymer–salt.
Project scheduling by FGP to Time-Cost-Quality trade off: construction case study
Faregh, Najmeh,Ketabi, Saeedeh,Ghandehari, Mahsa Korea Institute of Construction Engineering and Ma 2014 Journal of construction engineering and project ma Vol.4 No.3
Project managers are responsible to conduct project on time with least amount of costs and the most possible quality with respect to shortage of resources and environmental certainties. They have to make the best decision to reach such conflicting objects. In this study the project scheduling with multi goals-multi modes was planned in fuzzy conditions under resource constraints and expanded by fuzzy goal programing (FGP). The project cost was calculated by the price of renewable resources and the quality criteria were evaluated by the quality function deployment method (QFD). Finally the model was verified by a construction case study with 22 activities along with solving by GAMS. The results showed that this model could provide a systematic framework to facilitate the decision making process and made the project managers to be able to schedule the project closer to reality.
A Comparative Study of Iranian and Japanese English Teachers" Demotivational Factors
( Somayeh Baniasad Azad ),( Saeed Ketabi ) 범태평양응용언어학회 2013 범태평양응용언어학회지 Vol.17 No.1
This study examined demotivational factors among Iranian and Japanese college teachers of English. To achieve the purpose, the study used a 35- item questionnaire and semi-structured interviews. The results were compared with the similar study in Japan by Sugino (2010). The findings of the study revealed that Iranian and Japanese lecturers are much similar regarding motivation and demotivation in their teaching. However, there is difference with respect to the top items causing demotivation. For Iranian teachers, the most demotivating items were ``No consistency in curriculum with clear goals``, ``No bonus, ``Little appreciation from the administration``, ``Employment system is unstable``, ``When students are not interested in studying``, and ``Lack of research fund``. Whereas, the top demotivating items for Japanese college teachers were: students using cell-phones in classes, students sleeping in class, students taking rebellious attitudes, long meeting hours, much paperwork, and ``fixed teaching method. Implications for curriculum development, working conditions, and educational authorities will be discussed.
A Comparative Study between Iranian and Japanese Students` Conceptions of “Ideal English Lesson”
( Sakineh Jafari ),( Saeed Ketabi ) 범태평양응용언어학회 2014 범태평양응용언어학회지 Vol.18 No.1
With the shift in language teaching towards a more learner-centered approach, there is now an emphasis on considering learners` views on what goes on in the classroom. Involving learners in selecting and evaluating classroom activities as well as listening to their voices and preferences can be helpful for teachers in planning lesson and designing materials. With this idea in mind, the present study focuses on the tertiary students` perceptions of ``ideal English lesson`` in Iran and Japan. 115 Iranian students completed a questionnaire designed by Littlewood (2010). The results were compared with the Littlewood`s (2010) study with Japanese students as well as students from three Asian countries (Hong Kong, Singapore, and Mainland China). The findings show that for Iranian students non-communicative activities were regarded as an ``ideal English lesson``. Japanese students expressed generally more conservative preferences than their counterparts in Iran and the three other Asian countries. The results suggest that learners` beliefs about language learning, proficiency level, and future needs may affect their current preferred classroom activities. Implications for lesson planning and curriculum development are also discussed in this paper.