the purpose of this study was to examine the english language needs of medical students at tehran university of medical sciences . analysis of the needs took place for three groups: 320 undergraduate students, 30 postgraduate students and 20 university instructors. a triangulation approach to collect data was used in which a combination of the quantitative (using the questionnaires) and qualita...

Increasing environmental pollution from fuel vehicle and limited fossil fuel resources have increased tendency to produce electric vehicles. In Iran, the use of electric vehicles requires further study in the field of supply and demand for this product. Regardless of the supply issue, the use of electric vehicles requires a better understanding of the needs, wants and tastes of consumers. In th...

Increasing environmental pollution from fuel vehicle and limited fossil fuel resources have increased tendency to produce electric vehicles. In Iran, the use of electric vehicles requires further study in the field of supply and demand for this product. Regardless of the supply issue, the use of electric vehicles requires a better understanding of the needs, wants and tastes of consumers. In th...

any change in the refractive index of a laser active medium can lead to serious degradation of beam quality, laser beam modes, laser performance and variation in the intensity distribution. alteration in the refractive index of laser active medium is especially notable in high power lasers. it is clear that in the laser beam production, the pumping agent induces a great amount of heat which...