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In the recent decades, because of the reduction of the fossil sources and increasing the environmental pollution, also worldwide population growth and the necessity of energy have made humanbeing to use the Renewable Energy. Wave energy is an opulent source of energy in many parts of the world, especially in Iran.
In this thesis, in the first chapter, different kinds of renewable energy are introduced, and the importance of them is discussed. In the second chapter, the mechanisms of extracting energy by the wave energy converters are investigated, and their types are discussed. Then, in the next chapter, wave equations, wave spctrums and simulation of a flap wave energy converter in... 

Multistream plate-fin heat exchangers are used to supply the energy required by process units in the oil and gas industry. improving their performance is very important to reduce operating costs. In many applications, mixed refrigerants have replaced to improve the performance of plate-fin heat ecxhangers; Because the greater adaptability of the mixed refrigerant to the required refrigeration conditions that reduces the exergy losses. The Prico liquefaction cycle is one of the most commercial and commonly used liquefaction cycles. One of the most important parameters in designing a Prico liquefaction cycle is the molar percentage of the mixed refrigerant components. Proper determination of...