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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Exploring the use of structured musical stimuli to communicate simple diagrams: The role of context.

Alty, James L., Rigas, Dimitrios I. January 2004 (has links)
no / The results from previous experiments using structured musical stimuli to communicate coordinate locations within a graphical grid, navigation of an auditory cursor and simple shapes are used as a basis for further exploratory research to communicate diagrams. An experimental framework program (called AudioGraph) provided a platform for investigating musical information processing for blind users. Under this platform, simple arrangements of shapes (forming diagrams) were communicated to users using structured musical stimuli. Meaningfully arranged graphical shapes (at least for the visual sense) were communicated in the absence, and in the presence of a particular perceptual context or different perceptual contexts. The results indicated that perceptual context played an important role in the interpretation of the structured musical stimuli that communicated simple diagrams. The paper concludes with a discussion on the implications of the results, the role of context and the use of structured musical stimuli to communicate graphical information to visually impaired users.
2

Assessing Offshore Wind Power Potential in Fiji : A GIS-based Site Suitability and Feasibility Analysis

Askenberger, Felix, Renefalk, Victor January 2023 (has links)
Renewable energy, including offshore wind power, is expected to play a significant role in mitigating climate change and meeting a growing demand on electricity. Fiji, a Small Island Developing Nation in the South Pacific, needs large quantities of additional renewable energy to achieve its NDC goals and has good natural resources for offshore wind power. The purpose of the study is to analyse the technical potential for fixed and floating offshore wind power, identify the most suitable site (s), perform economic feasibility analysesfor different-sized offshore wind farms and determine possible emission reductions from offsetting electricity generation based on fossil fuels. The objectives are achieved through a literature study, interviews, a GIS-based multi-criteria site suitability analysis and feasibility calculations. In the study it was concluded that there is great potential for offshore wind power in Fiji. There are large areas with technical potential for fixed and floating offshore wind power and the most suitable sites, both located in the Bligh waters, have average wind speeds of 8.6 m/s and 8.5 m/s. The potential for offshore wind power was concluded to be large enough for Fiji’s needs, economically feasible and potentially competitive to invest in. The simple payback time would be approximately 13.5 years and the cost of electricity would be 0.13 USD/kWh, which is lower than the feed-in tariff for Fiji’s national grid at 0.15 USD/kWh. Different-sized offshore wind farms and its possible emission reductions could contribute with between 12-37% of Fiji’s NDC goal to reduce emissions from the energy sector by 30% compared to a business as usual scenario as well as contribute to have 99% renewable grid-connected electricity generation by 2030. However, during the study, it was concluded an implementation of offshore wind power in Fiji would require large investments, large capacities of energy storage, frequency regulating services and there are potential environmental and social impacts have to be taken into consideration. There is also a need for further research on how to cyclone-proof offshore wind farms in Fiji. / Förnybar energi, inklusive havsbaserad vindkraft, förväntas spela en avgörande roll för att minska klimatförändringarna och för att möta en ökande efterfrågan på elektricitet. Fiji, en liten önation i Stilla havet, behöver stora mängder ytterligare förnybar energi för att nå sina NDC mål och har bra naturresurser för havsbaserad vindkraft. Syftet med studien är att analysera den tekniska potentialen för fixerad och flytande havsbaserad vindkraft, identifiera de mest lämpliga platserna, utföra ekonomiska lönsamhetsanalyser för olika stora havsbaserade vindkraftsparker och avgöra möjliga utsläppsminskningar genom att avsätta elproduktion baserad på fossila bränslen. Målen uppfylls genom en litteraturstudie, intervjuer, GIS-baserad multikriterie platslämplighetsanalys och genomförbarhetsberäkningar. I studien drogs slutsatsen att det finns stor potential för havsbaserad vindkraft i Fiji. Det finns stora områden med teknisk potential för fixerad och flytande havsbaserad vindkraft och de mest lämpliga platserna, båda belägna i Bligh waters, har genomsnittliga vindhastigheter på 8.6 m/s och 8.5 m/s. Potentialen för havsbaserad vindkraft bedöms vara stor nof för Fijis behov, ekonomsikt genomförbart och potentiellt konkurrenskraftigt att investera i. Återbetalningstiden bedöms vara ungeför 13.5 år och elektricitetskostnaden 0.13 USD/kWh, vilket är lägre än inmatningstaxan till Fijis nationella elnät som är på 0.15 USD/kWh. De 12-37% av Fijis mål om att minska utsläppen från energisektorn med 30% jämfört med ett business as usual scenario liksom bidra till att ha 99% förnybar elnätsansluten elgeneration till 2030. Men, i studien drog också slutsatsen att en implementering av havsbaserad vindkraft i Fiji skulle kräva stora investeringar, stora mängder energilagring, frekvensreglerande tjänster och det finns potentiella miljömässiga och sociala effekter som måste tas i hänsyn. Det finns också behov av ytterligare forskning om hur man kan cyklon-säkra havsbaserade vindkraftsparker i Fiji.

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