The objective of Poland’s energy policy is to guarantee security while enhancing economic competitiveness and efficiency, thus minimizing the power sector’s environmental impact optimizing use resources in country. Poland not only European country rely on coal for generation. Historical factors large deposits act as natural barriers increasing share renewable Polish sector. Yet, today, concerns...

the wet and dry spells can be defined as a number of consecutive months with rain amount greater or less than the truncation level, respectively.analysis of the wet and dry spell properties of monthly rainfall series at 40 meteorology stations in the golestan province is carried out for an extended period of 34 years (1974–2007). the results proved that the patterns of wet and dry spell duratio...

Information systems consist of multiple mobile stations and xed stations communicating with each other. Mission critical applications are required to be executed fault-tolerantly in these systems. However, mobile stations support neither enough volume of storage and processing power nor enough capacity of battery to do reliable communication for a long period. Moreover, wireless communication c...