Sökning: "track"

Visar resultat 11 - 15 av 751 avhandlingar innehållade ordet track.

1. 11. Optimization of track geometry maintenance : a study of track geometry degradation to specify optimal inspection intervals

   Författare :Iman Arasteh khouy; Per-Olof Larsson-Kråik; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Drift och underhållsteknik; Operation and Maintenance;

   Sammanfattning : Railway infrastructure is a complex system which comprises different subsystems. Long useful life span is one of the important aspects of this prime mode of transport. The useful life length of its assets is highly dependent on the maintenance and renewal strategy used during its life cycle. LÄS MER

3. 12. Wheel–Rail Impact Loads and Track Settlement in Railway Crossings

   Författare :Xin Li; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; vehicle--track dynamics; wheel--rail contact; track settlement; material modelling of ballast; Switches and crossings; turnout; cyclic loading; Green s functions;

   Sammanfattning : Turnouts (Switches & Crossings, S&C) are critical components of a railway track requiring regular maintenance and generating high life cycle costs. A main driver for the high maintenance costs is the need to repair and replace switch rails and crossings as these components are subjected to a severe load environment. LÄS MER

4. 13. Quality on single-track railway lines with passenger traffic : Anlytical model for evaluation of crossing stations and partial double-tracks

   Författare :Olov Lindfeldt; Bo-Lennart Nelldal; Lars-Göran Mattsson; Nils Olsson; KTH; []
   Nyckelord :Railway operation; Railway capacity; single-track; crossing station; partial double-track; TECHNOLOGY; TEKNIKVETENSKAP;

   Sammanfattning : Railway transportation is showing a substantial increase. Investments in new infrastructure, new fast and comfortable vehicles, and high frequency of service are important factors behind the increase.Infrastructure configuration and timetable construction play important roles in the competitiveness of railway transportation. LÄS MER

5. 14. Fast track abdominal hysterectomy : On the mode of anesthesia, postoperative recovery and health economics

   Författare :Ninnie Borendal Wodlin; Preben Kjølhede; Lena Nilsson; Christer Borgfeldt; Linköpings universitet; []
   Nyckelord :Abdominal hysterectomy; Cost-effectiveness; Fast track; General anesthesia; Health economy; Intrathecal morphine; Postoperative recovery Postoperative symptoms Randomized study; Spinal anesthesia; Quality of Life; MEDICINE; MEDICIN;

   Sammanfattning : Introduction: Hysterectomy is the most common major gynecological operation in the Western World and approximately 5000 benign hysterectomies are performed in Sweden every year. Consequently it is a surgical procedure that affects many women. LÄS MER

7. 15. Keeping track of time : Daily time management, participation, and time-related interventions for children, adolescents, and young adults with neurodevelopmental disorders

   Författare :Birgitta Wennberg; Per A Gustafsson; Anette Kjellberg; Gunnel Janeslätt; Maria Larsson-Lund; Linköpings universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; ADHD; autonomy; ID; daily time management; intervention; occupational therapy; participation; time assistive devices; time processing ability;

   Sammanfattning : The overall aim of this thesis was to investigate daily time management (DTM) and time-related interventions aiming to enhance participation in everyday activities among school-age children and young adults with neurodevelopmental disorders.In study I, experiences of participation when using time assistive devices (TADs) in daily activities were investigated from the perspective of young adults (aged 17–37) with intellectual disabilities (ID) (n = 9), using semi structured interviews. LÄS MER