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 / Double-blind / Triple-blind / Open / Other The review process in SNF-2021 was conducted by a single-blind process, which means that only referees know the identity of authors, but the authors do not. • Conference submission management system: Open Journal System • Number of submissions received: 157 • Number of submissions sent for review: 130 • Number of submissions accepted: 117 • Acceptance Rate (Number of Submissions Accepted / Number of Submissions Received X 100): 117 157 × 100 % = 74.5 % • Average number of reviews per paper: 10 • Total number of reviewers involved: 13 • Any additional info on review process: None • Contact person for queries: Name : Dr. Teguh Budi Prayitno Affiliation: State University of Jakarta Email : teguh-budi@unj.ac.id