psychological capital (psycap) construct is a core concept of positive psychology consisting of the positive psychological resources of self-efficacy, hope, optimism, and resilience. previous studies confirmed link of psycap with employee attitude, behavior, workplace outcomes and job performance. in today's competitive environment, it is a challenging task for all organizations to enhance the ...

in this paper, control of a non-isothermal continuous stirred tank reactor in which two parallel autocatalytic reactions take place has been addressed. the reactor shows chaotic behavior for a certain set of reactor parameters. in order to control the product concentration, an optimal state feedback controller has been designed. since concentrations of reactor species are not measured, an obser...

this paper concerns a study on the optimal control for nonlinear systems. an appropriate alternative in order to alleviate the nonlinearity of a system is the exact linearization approach. in this fashion, the nonlinear system has been linearized using input-output feedback linearization (iofl). then, by utilizing the well developed optimal control theory of linear systems, the compensated nonl...

this study examined and compared the effects of consciousness-raisingwritten corrective feedback in 2 newly-developed levels in terms of marked thirdperson -s acquisition. nine elementary level intact classes, including 191 malelanguage learners within the age range of 11-14 at iran language institute, weretaken as the participants. relying on the participants’ placement test results,previous t...

this study focused on investigating the impact of keeping oral dialogue journals on efl learners’ oral fluency. sixty participants were ed out of 80 undergraduate freshmen who were studying english translation at sanandaj islamic azad university and pre-intermediate students at passargadeh jam language school based on their scores on a piloted proficiency test. they were then randomly divided i...

due to the high efficiency and low switching losses of resonant power convertors in comparison with switching convertors, nowadays there is a growing trend towards these convertors. however, because of the high frequency of switching in such convertors, it is quite difficult to present an efficient control method. in this paper, based on the state feedback method and using pole placement techni...

background and aim : the hearing loss and acoustic feedback signal in the binaural hearing aids may annoy users, make speech reorganization difficult, and affect the sound quality. this paper presents a new method for acoustic feedback suppression in binaural hearing aids, based on the combination of binaural information and blind source separation. this method can enhance sound from the specif...