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VILNIUS TECH Library invites you to follow the published new dissertations. The dissertation „Development and Property Studies of Structures with Acoustic Metamaterial Made from Recycled Plastic“ („Konstrukcijų su akustine metamedžiaga iš perdirbto plastiko kūrimas ir savybių tyrimai“) prepared at VILNIUS TECH by Andrej Naimušin. The dissertation was prepared in 2021–2026. Scientific consultant – Assoc. Prof. Dr Tomas Januševičius. The dissertation was defended at the public meeting of the Dissertation Defence Council of the Scientific Field of Environmental Engineering in the Aula Doctoralis Meeting Hall of Vilnius Gediminas Technical University at 9 a.m. on 15 May 2026. The dissertation examines plastic constructions and an acoustic metamaterial that is based on the Helmholtz resonator’s operating principle. The main object of the research is a structure made of a metamaterial from recyclable plastic, which has good sound insulation and sound absorption properties. The dissertation aims to create a structure made of metamaterial from recycled plastic to improve sound insulation for indoor partitions and room sound absorption. The following tasks are solved in the work: the first task concerns the development of metamaterials and the study of their non-acoustic and acoustic properties; the second task is related to theoretical calculations for individual metamaterial resonators using the transfer matrix method; the third and fourth tasks characterise acoustic properties using an interferometer and a sound transmission chamber, and the design of sound-absorbing panels made of recycled plastic metamaterial and sound-insulating systems with recycled plastic metamaterial; and the fifth task is the prediction of the sound insulation and sound absorption of the final engineering solution using modelling programmes. The dissertation consists of an introduction, three chapters, general conclusions, a list of used literature, and a list of the author’s publications on the topic of the dissertation. The introductory chapter describes the research problem and the work’s relevance, describes the object of the research, formulates the aim and tasks of the work, indicates the research methodologies, the scientific novelty of the work and the practical significance of the work results, and presents defended statements. The introduction closes by listing the author’s publications and conference presentations on the dissertation topic and by providing the dissertation’s structure. The First Chapter examines the possibilities of recycling plastic waste to improve indoor acoustics and analyses scientific research on sound insulation and sound absorption. The Second Chapter presents methodologies for sample calculation and preparation, determination of acoustic and non-acoustic properties, and modelling of sound insulation and absorption. The Third Chapter presents the results of theoretical, sound insulation, sound absorption, and static air resistance research and their analysis. Five scientific articles have been published on the dissertation topic: three in scientific journals included in the Web of Science database; one in the Scopus-referenced conference proceedings; and one in a conference proceedings publication referenced in other international databases. Five presentations on the dissertation topic were given at conferences in Lithuania and abroad. Doctoral dissertation readers can search via VILNIUS TECH Virtual Library.

We invite you to familiarise yourself with the VILNIUS TECH guidelines for the preparation of final theses and internship reports. The electronic publications are available on the website ebooks.vilniustech.lt The purpose of the publications is to provide students with guidance on how to prepare their final thesis. The study books cover the stages of the thesis, its structure, formatting, the methodology for writing the parts, the methods of producing an academic text, citations, and the compilation of a reference list. These study books will help you prepare your thesis according to sound academic standards: We kindly invite the VILNIUS TECH community to use the Library's other e-resources, which include electronic books and journals on a wide range of topics and areas for study and research. Access to electronic resources is available through the VILNIUS TECH computer network and remotely through a VPN connection. Connecting to the VPN service requires additional two-factor authentication (i.e., confirmation through the mobile device app or a call) to ensure security. For more information on how to read eBooks on ebooks.vilniustech.lt, click here For further questions, please contact ebooks@vilniustech.lt