New doctoral dissertation

June 10, 2025

VILNIUS TECH Library invites you to follow the published new dissertations. The dissertation „Multi-criteria evaluation of sustainable supply chain management in construction companies“ („Tvariosios tiekimo grandinės valdymo statybos įmonėse daugiakriteris vertinimas„)  prepared by VILNIUS TECH, Ieva Cataldo. The dissertation was prepared in 2021–2025. Scientific Consultant – Prof. Dr Audrius Banaitis.

The dissertation was defended at the public meeting of the Dissertation Defense Council of the Scientific Field of Civil Engineering in the Aula Doctoralis Meeting Hall of Vilnius Gediminas Technical University at 10 a.m. on 10 June 2025.

The dissertation examines the challenges of sustainable supply chain management in the construction sector. The main research object is construction companies that apply sustainable supply chain management. The primary goal of the dissertation is to create a conceptual tool that allows for evaluating Sustainable Supply Chain Management (SSCM) in construction companies using multi-criteria decision-making methods. The dissertation consists of an introduction, three chapters, general conclusions, a list of references, a list of publications by the author on the dissertation topic, and three appendices. The introduction discusses the research problem and relevance of the work, describes the research object, formulates the goal and objectives, and presents the research methodology, scientific novelty, practical significance of the results, and the defended statements. At the end of the introduction, the author’s publications and conference presentations are listed related to the dissertation topic, as well as the structure of the dissertation. The First Chapter is dedicated to the literature review, providing an analytical overview of the latest scientific research conducted in Lithuania and internationally. The aim is to define what sustainable supply chain management is and how it can be assessed. The chapter ends with conclusions and the thesis tasks. The Second Chapter presents the theoretical principles of the SSCM tools for construction companies, including an overview of the formation of the SSCM sustainability indicator system and multi-criteria decision-making methods. The following methods are discussed in detail: the expert method for determining indicator significance, the multi-criteria DEMATEL, BWM, and MABAC. Finally, the methodology for constructing the composite SSCM self-assessment index for construction companies is reviewed. The Third Chapter explores the practical application of the proposed tool for assessing sustainability in real construction companies. A methodology and an algorithm are proposed for implementing the conceptual tool to evaluate sustainable supply chain management in a real construction company. Six scientific articles were published on the topic: two in journals indexed in the Web of Science list, two in referenced conference paper collections and two in a peer-reviewed collection of conference papers in Lithuania. Additionally, five presentations related to the dissertation topic were delivered at conferences in Lithuania and other countries, and the results were presented at a seminar at Riga Technical University.

Doctoral dissertation readers can search via VILNIUS TECH Virtual Library.

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New doctoral dissertation
New doctoral dissertation
VILNIUS TECH Library invites you to follow the published new dissertations. The dissertation „Research and application of biofiltration materials in the purification of biogas from hydrogen sulfide“ prepared at VILNIUS TECH by Kamyab Mohammadi. The dissertation was prepared in 2022–2026. Scientific consultant – Assoc. Prof. Dr Rasa Vaiškūnaitė. The dissertation was defended at the public meeting of the Dissertation Defense Council of the Scientific Field of Environmental Engineering in the Aula Doctoralis Meeting Hall of Vilnius Gediminas Technical University at 10 a.m. on 15 June 2026. This dissertation analyzes the removal of hydrogen sulfide (H₂S) from biogas via biofiltration. The study addresses one of the major challenges in biogas utilization, effective H₂S removal, since this compound is toxic and corrosive, and significantly reduces the operational efficiency and service life of biogas energy systems. The main object of the research is biofiltration materials intended for hydrogen sulfide removal from biogas: biochar produced from sewage sludge, cellular lightweight concrete (CLC) waste, and polyurethane foam (PUF). The doctoral dissertation aims to increase the efficiency of hydrogen sulfide removal from biogas and to enhance the operational stability of the biofilter by applying physically and chemically modified as well as unmodified waste-derived materials within the biofiltration process. The dissertation consists of an introduction, a literature review, chapters on methodology and results, general conclusions and recommendations, and lists of references and the author’s publications related to the dissertation topic. The Introduction presents the research problem and its relevance, describes the research object, formulates the aim and objectives, outlines the research methodology, scientific novelty, and practical significance of the results, and states the defended propositions. The First Chapter reviews biotechnologies for hydrogen sulfide removal from biogas, with particular emphasis on biofiltration mechanisms, the properties of biofilter packing materials, and the key factors determining process efficiency. The Second Chapter describes the experimental methodologies used to select biofiltration materials, determine their physicochemical and adsorption properties, inoculate and cultivate microorganisms, evaluate hydrogen sulfide removal efficiency, and the mathematically model the biofiltration process. The Third Chapter presents the results of theoretical and experimental investigations of innovative filtration materials, revealing the relationship between their properties and modification with microbial establishment, biofilm formation, and filter performance in hydrogen sulfide removal, and compares experimental results with mathematical modeling outcomes. Eight scientific papers related to the dissertation topic have been published: two in Web of Science-indexed journals with an impact factor, one in a Web of Science-indexed journal without an impact factor, four in other internationally indexed journals, and one in a conference proceedings volume indexed in the Scopus database. Seven presentations on the dissertation topic were given at national and international scientific conferences. Doctoral dissertation readers can search via VILNIUS TECH Virtual Library.  
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