Search for dissertations about: "Ulf Andersson"

Showing result 16 - 20 of 42 swedish dissertations containing the words Ulf Andersson.

2. 16. On Dental Trauma in Children and Adolescents : Incidence, Risk, Treatment, Time and Costs

   Author : Ulf Glendor; Arne Halling; Lars Andersson; Åke Nygren; Linköpings universitet; []
   Keywords : adolescence; child; time; incidence; costs; permanent dentition; primary dentition; risk; tooth injuries; MEDICINE; MEDICIN;

   Abstract : Background: Dental trauma occur in childhood and adolescence with consequences in time and costs for both patient and family. The scientific knowledge of these matters is scarce. For some individuals, dental trauma will result in long, time-consuming and costly treatments in childhood which will continue into adulthood. READ MORE

4. 17. Controlling the Formation and Stability of Alumina Phases

   Author : Jon Martin Andersson; Ulf Helmersson; Eric Kay; Linköpings universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; thin films; alumina; magnetron sputtering; phase stability; density functional theory; Material physics with surface physics; Materialfysik med ytfysik;

   Abstract : In this work, physical phenomena related to the growth and phase formation of alumina, Al2O3, are investigated by experiments and computer calculations. Alumina finds applications in a wide variety of areas, due to many beneficial properties and several existing crystalline phases. READ MORE

5. 18. Detecting Inclusions in a Silicone Rubber Phantom Using Standing Lamb Waves and Multiple Frequency Footprints

   Author : Ulf G Jonsson; Britt Andersson; Olof A Lindahl; Jacques Ohayon; Umeå universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Piezoelectric; Silicone rubber; Impedance; Resonance; Lamb waves; Phantom; Electronics; elektronik;

   Abstract : The thesis deals with one major question: is it possible, using one piezoelectric sensor/vibrator, to detect a hard inclusion in a silicone rubber phantom? The question was approached with an open mind and the task was subdivided into three clearly identifiable parts: characterization of the piezoelectric sensor/vibrator (paper I), creating a model of the visco-elastic properties of a tissue-like material (phantom) in contact with the sensor/vibrator (paper II), and to detect the presence of a hard inclusion in the phantom (paper III). All vibrations of the sensor/vibrator and phantom was modeled using a finite element method (FEM). READ MORE

6. 19. 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

7. 20. Model-based design of haptic devices

   Author : Ahmad Aftab; Kjell Andersson; Ulf Sellgren; Per Wennhage; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Haptic device; model-based design; stiffness; SRA - ICT; SRA - Informations- och kommunikationsteknik;

   Abstract : Efficient engineering design and development of high precision and reliable surgical simulators, like haptic devices for surgical training benefits from model-based and simulation driven design. The complexity of the design space, multi-domains, multicriteria requirements and multi-physics character of the behavior of such a product ask for a model based systematic approach for creating and validating compact and computationally efficient simulation models to be used for the design process. READ MORE