Viimeksi syötetyt Väitöskirjat

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    • Developing handprints to enhance the environmental performance of other actors 

      Lakanen, Laura
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 24.03.2023)
      Major environmental challenges, such as water scarcity and quality issues, excess use of virgin nutrients, air pollution and global climate change, have given rise to an urgent need to reduce the environmental impacts of ...

    • Analyses and comparison of energy systems and scenarios for carbon neutrality – Focus on the Americas, the MENA region, and the role of geo-technologies 

      Aghahosseini, Arman
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 23.02.2023)
      Energy systems underpin the economic growth of nations but are contributing to worsening climate change in the current state dominated by fossil fuels. Transitioning to a fossil-free renewables-based energy system is ...

    • Assessing the climate resilience of cropping systems through response diversity 

      Kaseva, Janne
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 24.02.2023)
      Northern agriculture faces a rapidly changing climate with increased weather variability. Diversification can reduce the sensitivity of crops to disturbances and foster their capacity to adapt and transform. Increased ...

    • Development directions in software testing and quality assurance 

      Hynninen, Timo
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 17.02.2023)
      In software engineering, testing and quality assurance activities are characterised as important yet costly phases of a product’s life cycle. On the one hand, quality issues or malfunctioning products can cause expensive ...

    • South Asia’s Energy [R]evolution – Transition towards defossilised power systems by 2050 with special focus on India 

      Gulagi, Ashish
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 09.02.2023)
      Current energy systems, with fossil fuels in the midst, are completely unsustainable on all accounts of environmental, social, and economic criteria. Consequently, global energy systems are undergoing transitions, primarily ...

    • Development of continuum beam elements for the Achilles tendon modeling 

      Obrezkov, Leonid
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 27.01.2023)
      Finite element analysis is a robust and effective tool for studying soft tissues and living systems. It can analyze them despite their sophisticated forms, and the results provide crucial information. However, the computational ...

    • Development of liquid–liquid extraction processes for concentrated hydrometallurgical solutions 

      Jantunen, Niklas
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 20.01.2023)
      Hydrometallurgical liquid–liquid extraction is a separation and purification method used for the recovery of metals from aqueous solutions. In this thesis, process design methods were studied and evaluated for the development ...

    • Fast contact copper extraction 

      Tamminen, Jussi
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 19.12.2022)
      The intensification of copper solvent extraction was examined in this thesis. Extraction with hydroxyoximes is used in industry for copper separation. The reaction between hydroxyoxime and copper is a two-phase interfacial ...

    • Research on key technologies of snake arm maintainers in extreme environments 

      Qin, Guodong
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 19.12.2022)
      The China Fusion Engineering Test Reactor (CFETR) is a major international scientific project to solve the problem of providing the ultimate energy source for mankind. The safe and stable operation of the test reactor ...

    • The interconnections of lock-in mechanisms in the forest-based bioeconomy transition towards sustainability 

      Luhas, Jukka
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 12.12.2022)
      Complex systems and changes in their structures and processes directed towards more sustainable practices have been increasingly investigated. However, such transitions towards sustainability have often been hindered by ...

    • Value creation in manufacturing industry based on the simulation 

      Eskola, Roope
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 09.12.2022)
      Digitalization and globalization challenge companies to remain competitive to survive. Digitalization is disrupting traditional business models and reshaping organizational structures but also offering new opportunities ...

    • Electrochemical recovery of rare-earth elements from NdFeB magnets 

      Makarava, Iryna
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 09.12.2022)
      The use of the rare-earth elements (REEs) is steadily increasing and, on the other hand, possibilities for their substitution in modern advanced technologies, especially in green energy applications, are limited. Recently, ...

    • Competitiveness through sustainability : drivers for logistics industry transformation 

      Lähdeaho, Oskari
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 09.12.2022)
      Sustainability has emerged as a central concern in business. Across all sectors, companies are looking for ways to reduce their negative environmental impact. Globally, transportation accounts for approximately a quarter ...

    • Global climate as a commons — from decision making to climate actions in least developed countries 

      Havukainen, Minna
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 09.12.2022)
      The international battle against climate change requires action from all parties of the United Nations Framework Convention on Climate Change including the rapidly developing low-income countries. Most of the least developed ...

    • Coupling Monte Carlo neutronics with thermal hydraulics and fuel thermo-mechanics 

      Rintala, Ville
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 30.11.2022)
      This work aims to improve the coupled calculations required for the modeling of nuclear reactors by producing more advanced computational tools. The study applies more advanced computational tools to more detailed ...

    • Towards security and resource efficiency in fog computing networks 

      Hoseinpur, Farhood
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 02.12.2022)
      The Internet of Things plays a crucial role in digitalising services in many domains directly affecting humans’ day-to-day lives. However, with immense digitalisation, the Big Data phenomenon has become a critical issue. ...

    • Methanol synthesis via CO2 hydrogenation in a periodically operated multifunctional reactor 

      Maksimov, Pavel
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 02.12.2022)
      Recognising the unsustainable nature of the current production practices, the global economy is now steering away from fossil energy sources. Although wind and solar energy have seen tremendous improvements over the past ...

    • Environmental impacts of the utilisation of challenging plastic-containing waste 

      Khan, Md.Musharof Hussain
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 01.12.2022)
      The current economy is primarily based on the concept of a linear economy, which results in negative impacts on the environment, human health, and over-dependency on resources. Shifting towards a circular economy could ...

    • Fatigue performance and the effect of manufacturing quality on the uncoated and hot-dip galvanized ultra-high-strength steel laser cut edges 

      Lipiäinen, Kalle
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 30.11.2022)
      Fatigue performance is a key issue in weight critical applications. In this study, the effect of local surface characteristics influenced by laser cutting, hot-dip galvanizing (HDG) and stress concentration factors, is ...

    • Modeling and system analysis of electrically driven mechatronic systems 

      Montonen, Jan-Henri
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 28.11.2022)
      A mechatronic system consists of mechanics, power electronics, and control electronics. Thus, designing a mechatronic system requires multidisciplinary knowledge. As the capabilities of microprocessors have increased and ...