the methods which are used to analyze microstrip antennas, are divited into three categories: empirical methods, semi-empirical methods and full-wave analysis. empirical and semi-empirical methods are generally based on some fundamental simplifying assumptions about quality of surface current distribution and substrate thickness. thses simplificatioms cause low accuracy in field evaluation. ful...

nowadays enhancing critical thinking in learners is considered one of the foreign language teachers’ tasks due to its high position in foreign language classrooms. when it comes to selecting materials for language classrooms, there are obviously some criteria that teachers should apply. the present study aimed at a critical thinking based analysis of ten picture story books and ten folktales th...

In order to determine the most important components of anise grain yield using regression analysis and path analysis, an experiment was conducted with 12 anise population in a randomized complete block design with three replications at research farm of the agricultural faculty, University of Zanjan in 2014 and 2015.  The evaluated traits were days to flowering, days to maturity, grain filling p...

Late spring frost usually damages flowers and reduces yield of almond trees. Due to natural sexual reproduction, in most of almond orchards of Qazvin province, Iran, which have been established through seedling propagation, a vast genetic variation has been occurred. This situation has been provided many possibilities to study different traits of native almond genotypes, to select superior geno...

abstract: country’s fiber optic network, as one of the most important communication infrastructures, is of high importance; therefore, ensuring security of the network and its data is essential. no remarkable research has been done on assessing security of the country’s fiber optic network. besides, according to an official statistics released by ertebatat zirsakht company, unwanted disconnec...

recent studies in scientific education as well as foreign and second language instruction suggest that thinking has rarely been an integral part of education and training in classroom. some scholars decried the lack of emphasis on thinking in the institutes and schools. they noted that memorization and drills were rewarded,while inquiry, reflection, and consideration of alternatives were frowne...

     In order to evaluate the genetic variability of Iranian wheat landraces and cultivars and to determine the relationship between grain yield and other traits, 313 Iranian wheat genotypes including 203 Iranian wheat landraces and 110 Iranian cultivars were planted in a three separated augmented design along with three check cultivars repeated in seven blocks in 2014 on the research field of ...