Abstract Over the previous decades, twinning rates worldwide have increased remarkably. This study aimed to describe changes in multiple birth and related demographic characteristics, such as maternal age level of education parents South Korea from 1981 2019. analyzed data obtained Korean Statistical Information Service. From 2019, total rate 5 22.5 pairs per 1000 births. rapid increase was due...

introduction. in order to improve planning, educational methodology, and evaluation in medical education, well-proportioned, exact and prospective programs are needed. without doubt, the main changes in medical education programs have resulted from researches performed in this area during the last decades. revision of medical education in iran began by the cultural revolution council by order o...

the purpose of this research is to analyze heat waves characteristics in the warm period of the year as a climatic hazard in iran. in this study, the daily maximum temperature is taken at 44 synoptic stations during the period 1981-2010. these temperature values were used to extract the intensity, frequency and duration of heat waves using percentile thresholds of 90, 95, and 98. the results sh...