Sökning: "lifetime estimation"

Visar resultat 21 - 25 av 52 avhandlingar innehållade orden lifetime estimation.

1. 21. Equalization of Distortion in A/D Converters

   Författare :Jonas Elbornsson; Fredrik Gustafsson; Linköpings universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Sammanfattning : Modern communication systems require A/D converters with very high sample rate and high accuracy. CMOS technology is suitable for integrating A/D converters on a chip at a low cost and low power consumption. However, the CMOS manufacturing process is quite inaccurate, which leads to errors in the A/D converters. LÄS MER

3. 22. Modeling and Testing of Insulation Degradation due to Dynamic Thermal Loading of Electrical Machines

   Författare :Zhe Huang; Industriell elektroteknik och automation; []
   Nyckelord :thermal degradation; thermal cycle; dynamic temperature; thermal-mechanical; fatigue; electrical insulation system; accelerated testing; condition monitoring; electrical machine; electrified vehicles;

   Sammanfattning : Electrical machines in electrified vehicles are subjected to dynamic loadings at different driving conditions, which results in dynamic temperatures. The aging of the Electrical Insulation System (EIS) in electrical machines is caused by these dynamic temperatures, namely high average temperatures and temperature cycles. LÄS MER

4. 23. Latent variable models for multivariate survival and count data

   Författare :Samuli Ripatti; David Clayton; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; matematisk statistik; Mathematical Statistics;

   Sammanfattning : This thesis consists of three papers on multivariate frailty models and one paper on the use of latent class models in genetic association studies. The common theme through the four papers is the use of latent variables to capture complex dependence structures in the data. LÄS MER

5. 24. Between open systems and closed doors : the needs and perceptions of parents of children with cognitive disabilities in educational settings

   Författare :Lise Roll-Pettersson; Rune Simeonsson; Stockholms universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; ABCX model; Cognitive disability; Parents; Teachers; Föräldrar till barn med funktionsnedsättning; Elever med särskilda behov; Lärarrollen; Sverige; pedagogik; Education;

   Sammanfattning : This thesis consists of three papers on multivariate frailty models and one paper on the use of latent class models in genetic association studies. The common theme through the four papers is the use of latent variables to capture complex dependence structures in the data. LÄS MER

7. 25. Degradation mechanisms and long-term performance of PUR insulation in district heating pipes

   Författare :Alberto Vega; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; mechanical performance; thermal conductivity; District heating pipe; degradation mechanisms; long-term performance; rigid polyurethane foam;

   Sammanfattning : District heating networks are used worldwide, especially in Scandinavian countries and also in many other countries, e.g. Germany, Russia, United States, South Korea and China. From an environmental point of view, district heating networks are a good alternative to more traditional building heating systems. LÄS MER