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Visar resultat 1 - 5 av 58 uppsatser som matchar ovanstående sökkriterier.

1. 1. Konditionsbedömning av en grupp transformatorer på Forsmark kärnkraftverk : Modellbaserad åldringsanalys av transformatorer

   Master-uppsats, Uppsala universitet/Institutionen för fysik och astronomi

   Författare :Samuel Sjöqvist; [2023]
   Nyckelord :Transformator; elkraft; energisystem; kärnkraft; åldrandehantering;

   Sammanfattning : This thesis used a model-based approach to assess the condition of a group of transformers at Forsmark nuclear plant. Since it’s problematic for practical and economic reasons to examine the paper insulation by inspection, this approach was chosen. LÄS MER

3. 2. Modified cellulose synthesized by different deep eutectic solvents as an additive in paper making process

   Master-uppsats, Karlstads universitet

   Författare :Shiniar Said Saleh; [2023]
   Nyckelord :green chemistry; dry strength additives; deep eutectic solvents; sodium periodate oxidation; charge density; dewatering; mechanical strength.;

   Sammanfattning : The environmental concerns that come with the currently used traditional papermaking process where petroleum-based additives are used, has tempted researchers to study “green” additives by introducing environmentally friendly modifications of cellulose as an additive in the papermaking process. This thesis will spin further on that by producing additives with different charge densities and focus on to incorporate an etherification reaction into potentially greens systems based on non-toxic and readily biodegradable deep eutectic solvent (DES). LÄS MER

4. 3. Impact of pulp chemical composition and fiber morphology on hygroexpansion and strength properties of kraftliner

   Master-uppsats, Lunds universitet/Kemiteknik (CI)

   Författare :Serdar Unal; [2023]
   Nyckelord :Chemical Engineering; Hygroexpansion; Pulp; Kraftliner; Tensile strength; Iso-brightness; Chemistry;

   Sammanfattning : Kraftliner is the unbleached pulp used in the outermost layer of corrugated cardboard. Like other types of paper, it is produced from wood chips as a raw material. Kraftliner is known for its high tensile strength, tear resistance, compressive strength, etc., making it suitable for packaging material for heavy objects. LÄS MER

5. 4. PFAS- En sammanfattning av ny forskning, med ett fokus på föroreningskällor, provtagning, analysmetoder och saneringsmetoder

   Kandidat-uppsats, Lunds universitet/Geologiska institutionen

   Författare :Sebastian Nilsson; [2022]
   Nyckelord :föroreningskällor; saneringsmetoder; analysmetoder; PFAS; provtagning; Earth and Environmental Sciences;

   Sammanfattning : PFAS (per- and polyfluoroalkyl substances) is a large group of pollutants that, over the last decade have been of great academic concern since it has been found all around the globe. PFAS is ubiquitous in our environment and frequently found in low background concentrations in soil and water; recent research has also found that PFAS occur in biotic samples, such as fish and plants. LÄS MER

7. 5. Synthesis and Investigation of Nitrile-Containing Polymers Inspired by Lignin

   Master-uppsats, Lunds universitet/Centrum för analys och syntes

   Författare :Tobias Lindborg; [2022]
   Nyckelord :Lignin; Polymer; Renewable; Bioresource; Glass transition temperature; Nitrile; Polymer technology; Chemistry; Technology and Engineering;

   Sammanfattning : The lignin-inspired derivatives coniferyl aldehyde and sinapyl aldehyde were used to prepare nitrile-containing methacrylate monomers with the aim to synthesize bio-based polymers exhibiting high glass transition temperatures (Tgs). The aldehydes were initially transformed to the corresponding nitriles and then underwent methacrylation before being polymerised by free-radical polymerisation. LÄS MER