Sökning: "Tar"
Visar resultat 1 - 5 av 1492 avhandlingar innehållade ordet Tar.
1. Biomass gasification in ABFB : Tar mitigation
Sammanfattning : Biomass gasification may be an attractive alternative for meeting future energy demand. Although gasification is a mature technology, it has yet to be fully commercialised due to tar formation. This study focuses on the tar mitigation in gas produced in an atmospheric bubbling fluidised bed (ABFB) gasification system. LÄS MER
2. Barnbiblioteket tar form : En idéanalytisk studie av perioden 1945–2018
Sammanfattning : Avhandlingens syfte är att skapa kunskap om vilka idéer som har format barnbiblioteket i Sverige under efterkrigstiden, samt hur idéerna har varierat över tid, i spänning och samspel mellan politik och profession.Forskningsfrågorna är: Vilka idéer om barnbiblioteket kommer till uttryck i riksdagstryck, utredningsbetänkanden publicerade som SOU samt bibliotekpress, och hur förhåller sig idéerna till varandra?Hur har idéerna som tagit sig uttryck i nämnda empiriska material varierat över tid?Hur ska idéerna, relationerna dem emellan samt deras variation över tid förstås? Studien görs ur ett historiskt institutionellt perspektiv, med fokus på hur institutioner förändras över tid. LÄS MER
3. Lärare tar gestalt : En hermeneutisk studie av texter om lärarblivande på distans
Sammanfattning : Texts, including teachers' responses to students' practice journals, in which a group of trainee teachers and their lecturers reveal their experiences of a distance education programme for primary school teacher training are interpreted in this thesis from within a hermeneutical tradition. Attention is focused first on how students through their texts conceptualise themselves as becoming teachers and also on how their teachers' responses to the students' texts contribute to this process. LÄS MER
4. Tar and Condensable Hydrocarbons in Indirect Gasification Systems
Sammanfattning : Biomass gasification, which is a primary process step in the production of biofuels, yields a combustible gas mixture (raw gas). This raw gas consists of a wide range of species, from permanent gases to condensable hydrocarbons, which are collectively known as tar. LÄS MER
5. Alkali Metals and Tar in Biomass Thermochemical Conversion: Development and Application of Online Measurement Techniques
Sammanfattning : Biomass is a renewable resource that can substitute the fossil-based products we depend on today. However, the conversion techniques require further improvement in order to be competitive with the traditional industry. LÄS MER