Viimeksi syötetyt Väitöskirjat

Aineistot 1-20 / 818

    • Thermal analysis of dissimilar weld joints of high-strength and ultra-high-strength steels 

      Njock Bayock, Francois Miterand
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 30.06.2020)
      Advances in steel production processes in the last two decades have enabled the production of novel materials with improved strength, weldability and usability. Many industries are implementing these novel materials into ...

    • The deposition and light absorption property of carbonaceous matter in the Himalayas and Tibetan Plateau 

      Yan, Fangping
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 29.06.2020)
      The Himalayas and Tibetan Plateau (HTP), known as the ―Third Pole‖ and ―world roof‖, contains the largest amount of glaciers outside the Arctic and Antarctic. Carbonaceous matter, mainly including black carbon (BC) and ...

    • Dynamic and thermal modeling of touch-down bearings considering bearing non-idealities 

      Neisi, Neda
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 26.06.2020)
      In an active magnetic bearing (AMB) supported rotor, the touchdown bearings support the rotor in case of an electromagnetic field failure or a fault in the control system. In this work, a dynamic and thermal model of ...

    • Separation efficiencies of freeze crystallization in wastewater purification 

      John, Miia
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 25.06.2020)
      In a changing world, it is of paramount importance to ensure the sufficiency of clean water for all. Wastewater purification will face unprecedented challenges as a result of growing human population and accelerating ...

    • The role of efficient forest biomass logistics on optimisation of environmental sustainability of bioenergy 

      KC, Raghu
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 17.06.2020)
      Forest biomass is a crucial element in the energy system in many parts of the world, especially in Finland, and it is expected to play a similar, if not a more important, role in the near future as countries aim to replace ...

    • Identification of magnetically levitated machines 

      Vuojolainen, Jouni
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 16.06.2020)
      Magnetically levitated machines use magnetic levitation to maintain the separation between the bearing races. They offer various benefits compared with other types of bearings: no contact between the bearing races, the ...

    • Fenton chemistry beyond remediating wastewater and producing cleaner water 

      Burgos Castillo, Rutely Concepcion
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 29.05.2020)
      The production, use and transformation of inorganic and organic chemical compounds are negatively affecting the global environment, whereas the disposal of byproducts generated at urban wastewater treatment plants isbecoming ...

    • Sustainable Recycling of Critical Materials 

      Rahimpour Golroudbary, Saeed
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 20.05.2020)
      The world’s supply of critical materials such as phosphorus (P), niobium (Nb), lithium (Li) and other strategically important elements is under increasing pressure due to the rapidly growing global demand in the recent ...

    • Enhanced micropollutant removal and nutrient recovery in municipal wastewater 

      Arola, Kimmo
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 27.04.2020)
      Depleting natural resources such as fresh water and phosphate minerals creates pressure to pursue towards resource recovery in municipal wastewater treatment. In addition, the aquatic environment is under stress due to ...

    • Modeling and Analysis of a High-Speed Solid-Rotor Induction Machine 

      Di, Chong
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology, 28.04.2020)
      Over the last few decades, high-speed electrical machines have become more popular than ever before because of the rapid development of power electronics, magnetic materials, and control engineering. Among all the machine ...

    • Sairaanhoitajien rajatun lääkkeenmääräämistoiminnan tuottavuuden, tehokkuuden ja kustannusvaikuttavuuden arviointi perusterveydenterveydenhuollon avohoidon palveluprosessissa 

      Laapio-Rapi, Emilia
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 03.04.2020)
      Kansalaisten perusterveydenhuollon avohoidon kasvanut palveluiden tarve on lisannyt asiantuntijasairaanhoitajien tarvetta avoterveydenhuollossa. Sairaanhoitajien laakkeenmaaraamistoiminnan avulla on pyritty vastamaan ...

    • Application of diverse feedstocks for biodiesel production using catalytic technology 

      Ambat, Indu
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 24.03.2020)
      Recently the rise in population and demand in energy for growth and development of countries leads to more consumption of fossil fuels which is a non-renewable source. The excessive usage of non-renewable resources results ...

    • Energy efficient hydrogen production by water electrolysis 

      Koponen, Joonas
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 28.02.2020)
      Hydrogen is the most abundant element in the universe. On Earth, it not only forms water molecules, but also commonly combines with carbon into hydrocarbons that power the current world economy. The use of these natural ...

    • Treatment of mining waters by electrocoagulation 

      Mamelkina, Maria
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 21.02.2020)
      The mining industry is known to be one of the major contributors to the pollution of aquatic systems. The presence, in mining water, of various contaminants in relatively high concentrations (the most common cations being ...

    • Managerial cognitive structures, strategy frames, collective strategy frame and their implications for the firms 

      Bergman, Jukka-Pekka
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 14.02.2020)
      The overall aim of this doctoral dissertation is to increase the understanding of the interconnection between the top managers, the firms, and the industry by investigating the managerial cognitive structures and their ...

    • The applicability of GaN high electron mobility transistors in a high-speed drive system 

      Jarvisalo, Heikki
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 10.02.2020)
      Lossless operation and instantaneous switching are properties of an ideal power elec-tronic switch. Wide band gap devices based on gallium nitride (GaN) are the current peak performers in regard to losses and switching ...

    • Application of software-defined radio for power-line-communication-based monitoring 

      Poluektov, Anton
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 07.02.2020)
      Power line communication (PLC) is an established telecommunication technology. A PLC-based communication system has the advantage of securing data. transmission over already existing power line networks. In this way, an ...

    • Käyttäjät liikuntapalvelujen kehittäjinä – käyttäjälähtöisessä palveluinnovaatioprosessissa käyttäjien tuottama tieto tutkimuksen kohteena 

      Harmokivi-Saloranta, Paula
      Acta Universitatis Lappeenrantaensis (Lappeenrannan-Lahden teknillinen yliopisto LUT, 17.01.2020)
      Suomalaiset liikkuvat terveytensä kannalta liian vähän. Ihmisten liikkumista on edistetty useilla eri tavoilla. Kansanterveyden näkökulmasta liikkumisen edistäminen onkin välttämätöntä, jotta voitaisiin ennaltaehkäistä ...

    • The efficiency and damage control of a recovery boiler 

      Pöllänen, Ilkka
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 16.12.2019)
      Recovery boilers are needed to produce sustainable energy from sideline by-products of the biomass processing industry. Customers need boilers which have a reliable, long operation time without unnecessary shutdowns and ...

    • Heuristic similarity- and distance-based supervised feature selection methods 

      Lohrmann, Christoph
      Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 16.12.2019)
      In the field of machine learning, the available data often contain many features to describe phenomena. This can pose a problem since only those features that are relevant to characterize the target concept are needed, ...