A field study was conducted in Semnan to measure the vaccination coverage rate in children from birth to 24   months and correlate the outcome with personal family and social characteristics of the subjects in 1372 (1994).   A total of 210 children below the age of 24 months, living in Semnan were selected randomly from thirty district   points of the town .   To gather the data a two section...

Background and Objectives: One of the most important determinants of the fertility level is the birth interval. Considering the importance of this issue, the aim of this study was to analyze the first and second birth intervals using shared frailty survival model and comparing factors affecting these intervals.   Methods: Probability proportional to size stratified sampling was used to select...

monumental changes occurring on a daily basis have altered the world into a global village of expanding technology and shrinking geography in which preparing language learners for intercultural communication seems to be a sine qua non for modern language education. employing a cross-sectional design in its first phase, this study investigated the intercultural sensitivity and language proficien...

among the low–dimensional allotropes of carbon, nanotubes and graphene have attracted very much attention from nano–science and nanotechnology specialists. they have been proposed as building blocks in nanometer device engineering. however, these structures are not defect–free. in this thesis, we focused on defective carbon nanotubes and graphene, and studied the effect of couple of very common...