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...

Introduction and purpose: Walking difficulty, visual impairment and distance perception disorders are the most important problems in old age. The purpose of this study was to compare distance perception in active and inactive elderly with an emphasis on physical activity. Materials and Methods: This causal-comparative study was conducted among elderly men in the city of Tabriz. Random sampli...

Introduction: Inhalation of suspended particulates in cement plants is one of the most important risk factors for pulmonary and respiratory problems for workers of these factories. The purpose of this study was to investigate the role of physical activity on pulmonary function among cement factory workers. Methods: This  cross-sectional descriptive-analytical study was conducted among 82 cemen...

Background: Pre Menstrual Syndrome (PMS) is not real life threatening but it can seriously alter the quality of life of many women and affect their productivity and mental health. On the other hand, physical activity is one of the factors affecting the PMS, In order to study this topic we decided to investigate levels of physical activity and Pre Menstrual Syndrome among female university stude...

abstract in first part of this project, the use of a new and biguanid-like catalyst supported on silica as a recyclable catalyst provides a new route for the synthesis of a variety of arylalkylidene rhodanine derivatives through knoevenagle reaction in at present of solvent at room temperature. rhodanine derivatives and especially arylalkylidene rhodanines have proven to be attractive compound...

 According to the World Health Organization, viable probiotics could have health effects. However, in recent years, many benefits have been observed through application of inactive and non-viable cells of microbes or their metabolites. Therefore, probiotics could be defined as viable, inactive, or non-viable microbial cells or cell extracts that have beneficial health effects on the host. Based...

Introduction: Social studies is the science that discusses man, his relationship with social, cultural and natural environments, developments in human life in the past, present and future, and various political, economic, cultural and environmental aspects. Therefore, the aim of the present study was to investigate the coefficient of students' engagement with the content of social studies textb...