introduction: cigarette smoking affects nitric oxide production. the aim of this study was to determine associations between tobacco smoke and serum nitric oxide metabolites (nox) concentration. methods: serum nox concentration was measured by the griess method in 230 nonsmokers, 238 active, 196 passive and 29 waterpipe smokers. subjects were selected from participants of tehran lipid and gluco...

Distributed Generator (DG) is a part of distribution network which is used to supply power both to the local loads and network. DG provides clean energy as it uses pollution free re-newable energy resources to generate power so interest in DG increases. Although DG provides many advantages such as improved reliability, efficiency etc it faces one technical issue called unwanted islanding phenom...

This experimental study evaluated the possible effects of textual input- based enhancement on the acquisition of passive form on Iranian pre-intermediate EFL learners. Sixty Iranian EFL learners at the pre-intermediate level of proficiency were randomly assigned into three groups; two experimental group and one comparison group. The first experimental group received passages in which the passiv...

this brief introduces a method of improving the power conversion efficiency of a dc-dc boost converter with passive snubber circuit. This method uses a passive snubber circuit which consists of two inductors, a capacitor, and a diode, to reduce switching loss. The use of passive soft switching methods has been emphasized as better alternative to active methods mainly because they do not require...