New doctoral dissertation

October 4, 2024
VILNIUS TECH Library invites you to follow the published new dissertations. The dissertation „Green Finance Model for the Sustainable Development of Zero-Waste Cities“ prepared by VILNIUS TECH, Julija Bužinskė. The dissertation was prepared in 2020–2024. Supervisor – Prof. Dr Jelena STANKEVIČIENĖ.

The dissertation was defended at the public meeting of the Dissertation Defence Council of the Scientific Field of Economics in the Aula Doctoralis of Vilnius Gediminas Technical University at 10 a.m. on 4 October 2024.

Green finance is a way of financing climate change mitigation, adaptation and other environmental challenges. Along with the green economy concept, green finance contributes to disseminating global environmental challenges and how these challenges can be overcome. One area of environmental challenge is waste and sustainable waste management for sustainable urban development, where the green economy and green finance disciplines can have a significant positive impact. The dissertation addresses the insufficiently effective use of the green finance model applicable to reducing municipal waste and following the “zero-waste” principles in the scientific literature and practice. It aims to develop and empirically test a green finance model that would lead to rational economic decisions for the sustainable development of zero-waste cities. The dissertation consists of an introduction, three chapters, and general conclusions. The First Chapter aims to determine the green finance concept within related economic theories, concepts, methods, and models. It provides insights into other interrelated concepts, such as bio-economy, low-carbon finance, climate finance, and socio-environmental finance. Additionally, it provides a review of the green finance instruments. The Second Chapter investigates the role of waste management within economic theories and establishes the concept of zero-waste and inter-municipal cooperation. It also shapes the strategy for developing zero-waste cities with the active involvement of green finance mechanisms. The Second Chapter describes the methods for forming a green finance model for developing zero-waste cities. The Third Chapter provides empirical approval results of the green finance model for developing zero-waste cities on the Lithuanian regional level. A set of general conclusions and recommendations for future research complete the dissertation. Five publications on the discussed study were published: two in the reviewed scientific journals, and three in conference proceedings.

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 „Performance investigation of a hybrid car engine fuelled with gasoline and gaseous mixtures“ („Benziną ir dujų mišinius naudojančio hibridinio automobilio variklio efektyvumo tyrimas“) prepared at VILNIUS TECH by Tadas Vipartas. The dissertation was prepared in 2021–2026. Scientific consultant – Prof. Dr Alfredas Rimkus. The dissertation was defended at the public meeting of the Dissertation Defence Council of the Scientific Field of Transport Engineering in the Aula Doctoralis Meeting Hall of Vilnius Gediminas Technical University at 9 a.m. on 12 June 2026. This dissertation investigates the use of alternative fuels (natural gas and hydrogen) to increase the efficiency of a spark-ignition engine. The impact of different fuels and engine control algorithms on the combustion process and on energy and ecological indicators was determined and evaluated by analysing the emerging technological constraints within the context of a power-split (series-parallel) hybrid powertrain. The dissertation presents a review of scientific literature, analysing the directions for internal combustion engine improvement, the properties of gaseous fuels and the challenges of their application, along with the operating principles of automotive hybrid powertrains. Bench tests were conducted to investigate the effect of late intake valve closing timing on an engine operating on natural gas, and the influence of hydrogen additives on the combustion process and knock control. The numerical analysis of the engine’s combustion process was performed using AVL BOOST™ software, while the energy and ecological indicators of the hybrid vehicle were evaluated through experimental research and numerical simulation in the AVL CRUISE™ software. The following main results were obtained in the dissertation: retarding the intake valve closing timing increased the brake thermal efficiency and NOx emissions while reducing carbon dioxide emissions when the engine operates on natural gas. It was determined that a hydrogen additive in the fuel improves the engine’s energy indicators, but increases nitrogen oxides emissions and the risk of engine knock. Engine knock is effectively managed by retarding the ignition advance angle. Numerical simulation results confirmed that these trends persist during the Worldwide Harmonized Light-duty Vehicles Test Cycle: the use of hydrogen reduces fuel consumption and carbon dioxide emissions, but increases nitrogen oxides emissions. The dissertation results revealed the potential of these technologies and strategies for their application. The obtained data can be applied in the development and selection of advanced engine control algorithms and in the formulation of technologically sound environmental standards. Nine scientific articles have been published on the topic of the dissertation: six in scientific journals indexed in the Clarivate Analytics Web of Science database with an impact factor, one in a scientific journal indexed in the Clarivate Analytics Web of Science database without an impact factor, one in conference proceedings indexed in the Clarivate Analytics Web of Science Conference Proceedings Citation Index, and one in peer-reviewed conference proceedings not indexed in international databases. The research results were presented at three scientific conferences in Lithuania and Poland. Doctoral dissertation readers can search via VILNIUS TECH Virtual Library.
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