In this paper, an eleven-phase permanent magnet brushless DC motor fed by an eleven-leg two-level inverter is modeled and simulated. In order to produce trapezoidal back electromotive force waveforms by permanent magnet rotor, the motor has concentrated stator windings. The motor speed is controlled by Mamdani-type fuzzy incremental controller. The hysteresis modulation is used for switching operation. The simulation is carried out by Matlab/Simulink. Index Terms-Fuzzy incremental controller, hysteresis band, permanent magnet brushless DC motor, voltage source inverter. B.Sc. degree in power electrical engineering from Kazeroon Islamic university, Kazeroon, Iran, in 2006, and the M.Sc. degree in power electrical engineering from Shahrood
Abstract:Although music possesses a kind of power and using it has been welcomed by many students in language classrooms, it seems that they take a non-serious image of the lesson while listening to songs and they may think that it is a matter of fun. The main objective of the present study was to investigate whether learning a foreign language through musical texts (songs) can have an impact on students' text recall ability in junior high schools. The participants were 90 students who were divided into three groups; two experimental and one control. Three cloze tests (fill in the blanks) were made based on the song lyrics, to measure students' text recall. All the students took the tests after listening to the songs and text passages. After four weeks of no treatment, the same tests were taken to measure students' delayed text recall. The data were obtained by counting the total number of words that were recalled. For the analysis of data One-Way ANOVA was employed, the results of which indicated that the speech group significantly outperformed the music group for songs 1 and 2. However, delayed text recall results showed no significant difference between the two groups. This study found that music was not of much help for the students and it sometimes played a distracting role.
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