Sökning: "Erik Lundberg"
Visar resultat 11 - 15 av 23 avhandlingar innehållade orden Erik Lundberg.
11. Vibrations induced by surface roughness in nonlinear rolling contacts
Sammanfattning : For efficient transportation in either trains, busses or passenger cars, rolling elements such as wheels, tyres, bearings and transmission elements are fundamental. The energy efficiency and the generation of noise and vibrations in rolling contacts depend on the surface roughness of contacting bodies. LÄS MER
12. Applications of active materials
Sammanfattning : Energy efficiency is a vital key component when designing and miniaturizing self sustained microsystems. The smaller the system, the smaller is the possibility to store enough stored energy for a long and continuous operational time. LÄS MER
13. Christianity, Generation and Narrative : Religious Conversion and Change in Sidama, Ethiopia, 1974–2012
Sammanfattning : This study presents narratives concerning religious conversion and change in Evangelical-Pentecostal Christian communities in the Sidama zone, Southern Ethiopia. The study is based on narrative data collected through field research, which mainly focuses on the period 1974–2012. LÄS MER
14. Heart Rate Variability in Stress-related Fatigue, Adolescent Anxiety and Depression and its Connection to Lifestyle
Sammanfattning : Heart rate varies constantly as a consequence of activity in the sympathetic and parasympathetic autonomic nervous systems (SNS and PNS). In short-term recordings, heart rate variability (HRV) is mostly related to the inhibitory activity of the vagal nerves, which are part of the PNS. LÄS MER
15. Alternatives to pickling : preparation of carbon and low alloyed steel wire rod
Sammanfattning : A well established method for scale removal on hot rolled wire rod is pickling. To avoid pollution problems, the wire rod can be mechanically descaled. By this method, the removed scale can be recirculated to the blast furnace. In batch pickling considerable energy is necessary; e. LÄS MER