List of Articles Open Access Article Abstract Page Full-Text 1 - Design , Construction and Evaluation of Exhaust Silencer for 399 Massey Ferguson Tractor Open Access Article Abstract Page Full-Text 2 - Study of the most suitable stringing method burley tobacco using sewing machines Open Access Article Abstract Page Full-Text 3 - Codifying optimum situation self-propelled agricultural machinery (SPAM) in Iran Open Access Article Abstract Page Full-Text 4 - Optimal design and mechanical analysis of a piece based on modeling agent-Combined furrow opener for use in machinery zero tillage (Combination and Brtyny) Open Access Article Abstract Page Full-Text 5 - Determination of Energy and economic indexes in orange orchards (Case study: city of Sari) Open Access Article Abstract Page Full-Text 6 - Investigation and determination of energy indices in greenhouse production of cucumber by DEA method in Qazvin province