this paper provides a fuzzy based decision support system (dss) for risk analysis in e-tourism ( electronic tourism ) investment. in general term, e-tourism is the use of information and communication technology (ict) in tourism which may allow operating tourism in least variable cost, least time and increased work efficiency. it is worth noting that there are many factors that affect the deve...

today, e-commerce has considerable portion in commercial businesses, and it has been developing. one of the most important steps in e-commerce is e-payment that has been done through different tools such as e-banking, and e-cheques. in this type of electronic transactions, there are always different worries both for payers and payees due to untruthfulness. for example, amount modifying, date mo...

Pitch control is one of t he  major aspects of wind turbine control, particularly over high wi nd s p e e d  a n d  oscillations. General El e c t r i c  (GE) model of  wi n d  t ur bi ne  i s practically compatible with the structure of the wind turbines. I t  h a s  b e e n  p r o v e d t h a t  simulation results using this model are closer to the actual case, compared to other available mod...

the genus exoprosopa macqurt, 1840 (diptera: bombyliidae: anthracinae) was studied in the north central iran. four species of the genus exoprosopa were identified of which e. minos (meigen,1804) and e. grandis (pallas, 1818) were previously recorded from northern parts of iran ( or north of iran ) and two species namely e. efflatounbeyi paramonov, 1928and e. altaica paramonov, 1925 are newly re...