Sökning: "Railroads"

Visar resultat 6 - 8 av 8 avhandlingar innehållade ordet Railroads.

1. 6. On wear in rolling/sliding contacts

   Författare :Rickard Nilsson; Ulf Olofsson; I. Sherrington; KTH; []
   Nyckelord :Technology; wear; rolling; sliding; contact; environment; TEKNIKVETENSKAP; TECHNOLOGY; TEKNIKVETENSKAP;

   Sammanfattning : The aim of this thesis is to increase the understanding of wear in rolling/sliding contacts such as the wheel-rail contact for railroads and the roller-washer contact for roller bearings. The Stockholm commuter train network has been the subject of papers A and B in this thesis in which the wear and surface cracks on rails has been observed for a period of three years. LÄS MER

3. 7. Government's Role for Transport Infrastructure : Theoretical Approaches and Historical Development

   Författare :Björn Hasselgren; Göran Cars; Hans Lind; Mark Pennington; KTH; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Government; Market; Planning; Transport Infrastructure;

   Sammanfattning : This thesis analyzes and discusses the development of the Swedish government’s role as owner and financier of roads and railroads from the 1930s until the 2010s. The influence on the development of the government’s role from two main theoretical paradigms is discussed and analyzed. LÄS MER

4. 8. Screening of Crushed Rock Material

   Författare :Monica Soldinger Stafhammar; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Sammanfattning : The quality requirements for sand, gravel and crushed rock material used on roads and railroads have been raised in recent years, hence suppliers must meet more rigorous demands. It is now necessary to improve the understanding of all parts of the production line. LÄS MER