Avancerad sökning

Visar resultat 1 - 5 av 2842 avhandlingar som matchar ovanstående sökkriterier.

1. 1. Assessing Mineral Resource Scarcity in a Circular Economy Context

   Författare :Hampus André; Chalmers tekniska högskola; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; resource-efficiency; area of protection - natural resources; electric and electronic equipment; supply risk; scarce metals; criticality assessment; material flow analysis; life cycle assessment; circular economy; complex products;

   Sammanfattning : Due to humanity’s dependence on metal resources there are growing concerns regarding impacts related to their potential scarcity, both for current and future generations. The vision of a more circular economy suggests that extending the functional use of metals through measures aiming for resource-efficiency (RE) such as increasing technical lifetime, repairing and recycling could reduce mineral resource scarcity. LÄS MER

3. 2. Undervisning med stöd av förproducerade material : Ett närmande av naturvetenskap i förskolan

   Författare :Elin Eriksson; Monika Vinterek; Annie-Maj Johansson; Sven Persson; Högskolan Dalarna; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; teaching; learning; pre-produced teaching materials; preschool; early childhood education; natural science; “Science and Technology for All”;

   Sammanfattning : This thesis aims to develop an understanding of the possibilities and challenges pre-produced teaching materials present to teachers and the learning opportunities children are offered in teaching that uses such materials. To do this a study of preschool teachers and children from three preschool departments in Sweden was carried out. LÄS MER

4. 3. Kalkbruk-krympsprickor och historisk utveckling av material, metoder och förhållningsätt

   Författare :Jonny Eriksson; Göteborgs universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Våtsläckning; krympsprickor; kalkbruk; puts; murhantverk; osläckta partiklar;

   Sammanfattning : I denna avhandling undersöks uppkomst av krympsprickor i puts. I undersökningen används våtsläckt sub- hydrauliska kalk. Den aktuella kalksorten har används i Sverige under 1800- och 1900-talet men också under 2000-talet i samband med putsrestaureringar. LÄS MER

5. 4. Tunning Multicolor Light Emission in Lead-free Materials

   Författare :Weidong Cai; Feng Gao; Jiajun Qin; Letian Dou; Linköpings universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Multicolor light emission; Chiral material; Color change under humidity; Lead-free organic and inorganic material; Incorporation of extra emission center; Leadfree double perovskite; Co-doping; Flerfärgad ljusemission; Kiralt material; Färgförändring under fukt; Blyfritt organiskt och oorganiskt material; Inkorporering av extra emissionscenter; Blyfri dubbel perovskit; Samdopning;

   Sammanfattning : Perovskites are a class of compounds with the general formula ABX3 and becoming increasingly attractive recently. Because this kind of material possesses various advantages such as abundant raw materials, easy synthesis, excellent photoelectric properties, and short production process. LÄS MER

7. 5. Assessing Sustainability and Guiding Development towards More Sustainable Products

   Författare :Gunilla Clancy; Chalmers tekniska högskola; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; action competence; early-stage product development; team learning; wood-based material; role of designer; semi-structured interview; ecolabels; management systems; participatory action research; sustainability assessment;

   Sammanfattning : Companies need to develop more sustainable products that fit into future more sustainable markets. For this reason, the integration of sustainability considerations is needed in the early stages of product development, where a major part of the sustainability performance of a final product is determined. LÄS MER