List of Articles optimal angle Open Access Article Abstract Page Full-Text 1 - Presenting a plan for buildings with solar panels by obtaining optimal angles for different months of the year to increase the amount of electricity production parya Shafipouryourdshahi Hossein Soleimani Mehdi Soleymani Gharagol 10.30495/jest.2023.71930.5812 Open Access Article Abstract Page Full-Text 2 - Evaluation of energy efficiency in production process of biodiesel to conventional, ultrasonic and microwave methods golmohammad khoobbakht Mahmoud Karimi 10.30495/jest.2023.73925.5876