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Visar resultat 1 - 5 av 18 avhandlingar som matchar ovanstående sökkriterier.

1. 1. Mellan närhet och distans : Lärar-elevrelationen som kunskapsinnehåll i grundlärarutbildning

   Författare :Anna Wistrand; Jonas Almqvist; Anneli Frelin; Jonas Aspelin; Uppsala universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; teacher-student relationship; closeness; curriculum theory; knowledge content; meaning; complexity; teacher education; lärar-elevrelation; närhet; läroplansteori; kunskapsinnehåll; meningserbjudande; komplexitet; lärarutbildning; Curriculum Studies; Didaktik;

   Sammanfattning : This licentiate thesis takes its point of departure in a relational perspective on education, which means that the relationship between teacher and student is seen as fundamental for students’ knowledge- and personal development. The aim is to contribute to a deeper understanding of the teacher-student relationship in teacher education at national and local levels and the different meanings of closeness in this context. LÄS MER

3. 2. Degradable copolymers in additive manufacturing: controlled fabrication of pliable scaffolds

   Författare :Astrid Ahlinder; Anna Finne Wistrand; T. Christian Gasser; Tiziana Fuoco; Minna Kellomäki; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fiber- och polymervetenskap; Fibre and Polymer Science;

   Sammanfattning : Inom vävnadsregenerering är produktionen av väldefinieradematriser med en porös arkitektur av nedbrytbara polymerer av stortintresse, dessa kan nu skapas genom additiva tillverkningsprocesser. Vidadditiv tillverkning krävs ett smalt munstycke för att skapa detaljrikastrukturer och detta ställer krav på att de reologiska egenskapernaanpassat. LÄS MER

4. 3. Microwave heating effects on degradation and migration of additives from polypropylene packaging

   Författare :Jonas Alin; Minna Hakkarainen; Jiebing Li; Anna Finne Wistrand; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Polymer chemistry; Polymerkemi;

   Sammanfattning : The effect of different food types, polymer qualities and microwaves on the overall and specific migration during microwave heating of plastic packaging was investigated to better understand the packaging-food interactions and the effect of microwaves on food packaging. This work focuses on the migration of chemical compounds to food simulants from commercially available polypropylene packages. LÄS MER

5. 4. Agro-Waste Derived Additives for Polylactide and Tapioca Starch

   Författare :Edwin Azwar; Minna Hakkarainen; Anna Wistrand; Christian Glandfils; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Agro-industrial waste; wood flour; rice bran; polylactide; starch; biomass; degradation; SRA - E-vetenskap SeRC ; SRA - E-Science SeRC ;

   Sammanfattning : Development of materials from renewable resources is one of the big challenges facing our world. In this thesis agro-industrial waste derivatives were developed and evaluated as additives for two common renewable polymer matrices, polylactide (PLA) and starch. Two waste products, wood flour (WF) and rice bran (RB) were evaluated in different forms. LÄS MER

7. 5. Thiol−ene Coupling of Renewable Monomers : at the forefront of bio-based polymeric materials

   Författare :Mauro Claudino; Mats K. G. Johansson; Mats Jonsson; Anna Wistrand; Sven Göthe; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Thiol-ene chemistry; monounsaturated fatty-acids; renewable resources; cis trans-isomerization; photopolymerization; networks; polyesters; thermal viscoelastic properties; thin-films; unsaturated macro lactones; coatings;

   Sammanfattning : Plant derived oils bear intrinsic double-bond functionality that can be utilized directly for the thiol–ene reaction. Although terminal unsaturations are far more reactive than internal ones, studies on the reversible addition of thiyl radicals to 1,2-disubstituted alkenes show that this is an important reaction. LÄS MER