Search for dissertations about: "Kenneth Holmberg"

Found 5 swedish dissertations containing the words Kenneth Holmberg.

2. 1. Generalised linear models with clustered data

   Author : Henrik Holmberg; Göran Broström; Kenneth Carling; Umeå universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Statistics; Statistik; Statistics; statistik;

   Abstract : In situations where a large data set is partitioned into many relativelysmall clusters, and where the members within a cluster have some common unmeasured characteristics, the number of parameters requiring estimation tends to increase with sample size if a fixed effects model is applied. This fact causes the assumptions underlying asymptotic results to be violated. READ MORE

4. 2. Significant history and historical orientation : Ugandan students narrate their historical pasts

   Author : Ulrik Holmberg; Martin Stolare; Kenneth Nordgren; Paul Zanazanian; Karlstads universitet; []
   Keywords : HUMANIORA; HUMANITIES; historical learning; history education; History education in Uganda; historical consciousness; historical orientation; upper secondary school; narrative; national narrative; History; Historia;

   Abstract : In 2012, Uganda celebrated 50 years of independence. The postcolonial era in the country has been marked by political turmoil and civil wars. Uganda, like many other postcolonial states in Africa, cannot be described as an ethnically or culturally homogenous state. READ MORE

5. 3. Nanocomposites for Use in Sliding Electrical Contacts

   Author : Benny André; Urban Wiklund; Staffan Jacobson; Kenneth Holmberg; Uppsala universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; tribology; materials science; Materialvetenskap; Materials Science; Engineering Science with specialization in Materials Science; Teknisk fysik med inriktning mot materialvetenskap; Teknisk fysik med inriktning mot tribomaterial; Engineering Science with specialization in Tribo Materials;

   Abstract : In this thesis nanocomposite materials for use in high performance electrical contacts are tested. Self mating silver as coatings on cupper substrates are the most used material combination in power connectors today. In this work two new concepts were tested. READ MORE

6. 4. Silicon nitride for total hip replacements

   Author : Maria Pettersson; Cecilia Persson; Håkan Engqvist; Staffan Jacobson; Kenneth Holmberg; Uppsala universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; SiNx; Si3N4; coatings; CoCr; Ti; alloy; tribology; wear; corrosion; dissolution; debris; hip; arthroplasty; Teknisk fysik med inriktning mot materialvetenskap; Engineering Science with specialization in Materials Science;

   Abstract : For more than 50 years total hip replacements have been a common and successful procedure to increase patient mobility and quality of life. The 10-year implant survival rate is 97.8%. READ MORE

7. 5. Wear of piston rings in hydrostatic transmissions

   Author : Ulf Skytte af Sätra; Sören Andersson; Kenneth Holmberg; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; piston ring; surface roughness; texture; coating; wear; hydraulic motor; Construction engineering; Konstruktionsteknik; Mechanical engineering; Maskinteknik;

   Abstract : This study focuses on the wear of piston rings in a hydraulic radial piston motor. The piston ring has to satisfy increasing demands for reliability and longer service life. It has two contacting surfaces, the face and the flank, and operates under a boundary lubrication state. READ MORE