Wireless technology usage is rapidly expanding and WiMAX technology is more widely used. The new WiMAX standard adopts relay stations (RS) for better QoS. Published researches on multi-hop relay networks concentrate on quality of service, stations resources distribution and management, as well as creating network topology for better service quality [1-4]. However no specific study conducted to ...

introduction. training midwives on life saving skills is one of the most important strategies in preventing maternal and neonatal mortality, especially in areas that physicians are absent. the effectiveness of each training program must be evaluated. objective structured clinical evaluation can be applied to evaluate the learner skill improvement on special tasks with lowest skill evaluation bi...

The data used in developing the frequency relations consisted of both daily and hourly precipitation records from Illinois and from nearby stations in surrounding states. The daily data, mostly from nonrecording raingages, spanned the 83-year period from 1901 through 1983. They included data from the 61 precipitation-reporting stations discussed previously (figure 71, whose records had been car...

The data used in developing the frequency relations consisted of both daily and hourly precipitation records from Illinois and from nearby stations in surrounding states. The daily data, mostly from nonrecording raingages, spanned the 83-year period from 1901 through 1983. They included data from the 61 precipitation-reporting stations discussed previously (figure 71, whose records had been car...

DC fast charging (DCFC) and optimal placing of them is a fundamental factor for the popularization of electric vehicles (EVs). This paper proposes an approach to optimize place and size of charging stations based on genetic algorithm (GA). Target of this method is minimizing cost of conversion of gas stations to charging stations. Another considered issue is minimizing EVs losses to find neares...

Atmospheric Chemistry and Physics Discussions This discussion paper is/has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP if available. Abstract This study is the most extensive study to date on the transport of mercury to the Arc-tic. Moreover, it is the first such study to use a fully-coupled, online chemical tra...

We investigate a family of algorithms minimizing energetic effort in random networks computing aggregative functions. In contrast to previously considered models, our results minimize maximal energetic effort over all stations instead of the average usage of energy. Such approach seems to be much more suitable for some kinds of networks, in particular ad hoc radio networks, wherein we need all ...

the aim of this research is to analyze the performance of 8 drought’s index in isfahan, kerman and yazd province and choose the best index. for this purpose, used monthly and yearly rainfall data in the period of 30 years (1985-2014) and also used 8 drought indexes in 20 meteorological stations of central iran which the accuracy of each index in determining drought is examined. also zoning in a...