language textbooks are conventionally expected to develop the four language macro-skills, including listening, reading, writing and speaking in language learners. however, mastering the reading skill is of particular importance, since it enhances the comprehension of specialized texts in students. the objective of this research is to investigate the scientific aspect of persian textbooks in tea...

Keywords: Eigenface, face Recognition, k-means clustering, principle component analysis (PCA)

this study aimed at exploring the main sources of acute stress in wrestlersregarding the structure and the assessment of reliability and validity of the sourcesof acute stress in wrestlers questionnaire (saswq). for this purpose, thisquestionnaire was distributed among a sample of 330 wrestlers (mean age21.56+5.3) in tehran who were selected by multistage random sampling method.analysis of data...

background: cutaneous leishmaniasis is one of the most important parasitic diseases in humans. in this disease, one of the responsible organisms is leishmania major, which is transmitted by sandfly vector. there are specific differences in biochemical profiles and metabolite pathways in logarithmic and stationary phases of leishmania parasites. in the present study, 1h nmr spectroscopy was used...