This paper deals with a comprehensive survey on the topic of AC/DC & DC/DC converters for DC Motor Drives. A substantial number of different AC/DC and DC/DC topologies appropriate for DC motor drives are presented. This critical literature review brings out merits, demerits, and limitations besides giving the basic operating principles of various topologies. Keywords—controlled-rectifiers, chop...

Following 3 species of Compositaeare reported as new records to Iran: Cousinia pycnoloba, Lactuca dissecta and Launaea remotiflora. The collecting localities and their figures are given.

in this paper, a dc-dc resonant converter with high voltage gain and small size is studied. to reduce the size and weight of this converter, the operating frequency should be as high as possible. in this research, the frequency changes from 120 to 200 khz. due to the high operating frequency, it is necessary to reduce the switching losses using soft switching methods. resonant converters are su...

Cousinia Cass. is one of the widespread genera Asteraceae family. There a large number ofpharmacological activity studies on this genus and it has not yet been examined phytochemically in detail. Pseudo taraxasterol (ψ-taraxasterol) pentacyclic triterpene with different pharmacological such as antinociceptive, anti-inflammatory. In report, we aimed to evaluate ψ-taraxasterolcontent, which isola...