The rapid increase of non-linear loads in the last three decades has caused electrical quantities such as voltages and currents in 3-phase distribution systems to become distorted waveforms. This paper reviews, explains and discusses some new concepts, definitions and new available theory in the unbalanced and distorted systems. The usefulness of the proposed practical definitions is investigat...

Background: Multiple sclerosis (MS) is a chronic, typically progressive and most common autoimmune disease which damaged the central nervous system. According to the reports in 2008, this disorder has affected 2 and 2.5 million people globally. While the reason is not clear, proposed causes for this include immunologic, environmental, infectious and genetic factors, and sexuality. MS can cause ...

background and objectives: with increasing rate of immunodeficiency diseases in the world, opportunistic micro-organism such as pneumocystis jirovecii ( p. jirovecii ) become more important. little information is available on prevalence of this life- threatening microorganism in iran. this study was designed to determine the colonization and the rate of active disease caused by p. jirovecii in ...

The purpose of this research was to study the role of non-governmental organization inpreserving of urban green areas in the city of Tehran. This is a descriptive-correlationresearch method. Population of this study was 120 active members of two non-governmentalorganizations in Tehran. After distributing the questionnaires, 62 questionnaires werereturned. Content and face validity of the instru...