List of Articles Proportional Valve Open Access Article Abstract Page Full-Text 1 - Implementation and Simulation of an Automated PLC Hydraulic System for a Double-acting Actuator Using a Proportional Valve Karim Sobbouhi Farshid Aghadavoudi Mehdi Baharizadeh Open Access Article Abstract Page Full-Text 2 - A geometric approach for automatic guidance of marine loading arms Omid Kavianipour