Peer review declaration

All papers published in this volume of Journal of Physics: Conference Series have been peer reviewed through processes administered by the Editors. Reviews were conducted by expert referees to the professional and scientific standards expected of a proceedings journal published by IOP Publishing. • Type of peer review: Single-blind peer review by two reviewers • Conference submission management system: web-based system with custom-made, submissions were received and handled via e-mail • Number of submissions received: 250 • Number of submissions sent for review: 150 • Number of submissions accepted: 144 • Acceptance Rate (Number of Submissions Accepted/Number of Submissions Received X 100): 57% • Average number of reviews per paper: 2 • Total number of reviewers involved: 15 reviewers • Any additional info on review process: All papers are plagiarism checked by Turnitin software • Contact person for queries (please include: name, affiliation, institutional email address) Name: Dr. Ramli (corresponding editor) Affiliation: Department of Physics, Universitas Negeri Padang E-mail: ramli@fmipa.unp.ac.id