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 • Conference submission management system: EasyChair • Number of submissions received: 32 • Number of submissions sent for review: 32 • Number of submissions accepted:14 • Acceptance Rate (Number of Submissions Accepted / Number of Submissions Received X 100):43 • Average number of reviews per paper: 2.1 • Total number of reviewers involved:14 • Any additional info on review process: Professional translators took part in the preparation of the articles to ensure the good quality of the language. All articles received professional proofreading, in accordance with the requirements of the publisher. Contact person for queries: Sergei Sidorov Saratov State University, Astrakhanskaya, 83, 410012, Saratov, Russian Federation e-mail: sidorovsp@sgu.ru