List of Articles Open Access Article Abstract Page Full-Text 1 - Free vibration and statistic analysis of composite sector spherical shells using isogeometric methodology Ali Hosseinzadeh mohammad reza forouzan younes Alizadeh Open Access Article Abstract Page Full-Text 2 - Crack detection in pressurized pipes using Harris hawk optimization method Afshin Fathi Hesam Makvandi Open Access Article Abstract Page Full-Text 3 - Correction and improvement of the vibrations of air fans by increasing the Stiffness and changing the natural frequencies of the structure erfan mirshekari Bahman Poormohamad Open Access Article Abstract Page Full-Text 4 - Remaining useful life estimation of mechanical systems by mixed method of mathematical method and evolutionary computational framework fatemeh mehregan Open Access Article Abstract Page Full-Text 5 - Energy Analysis of a Cooling and Heating System for an Office Building Hossein Bagheri Abbas Kosarineia Open Access Article Abstract Page Full-Text 6 - مروری بر مطالعات پیشین بهبود عملکرد انتقال حرارت درون لوله دریافت کننده برج خورشیدی توسط تعبیه المان هایی درون لولههای دریافت کننده Hadi Farjadmehr Navid Bozorgan Alireza Daneh-Dezfuli