Sökning: "Jan Lindgren"

Visar resultat 16 - 20 av 25 avhandlingar innehållade orden Jan Lindgren.

  1. 16. Characterization problems in radio measurement systems

    Författare :Tore Lindgren; Zvonimir Sipus; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Industriell elektronik; Industrial Electronics;

    Sammanfattning : Radio measurement systems may have their performance significantly degraded due to environmental factors such as multipath, weather effects, and mechanical displacements. Characterization of these effects are therefore important in order to ensure functionality of the system. The characterization itself may also be the purpose of the system. LÄS MER

  3. 17. Road construction materials as a source of pollutants

    Författare :Åsa Lindgren; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Traffic Engineering; Trafikteknik;

    Sammanfattning : This thesis deals mainly with road construction materials, particularly in cases where they may contribute polluting substances. The complexity of the measuring and evaluation of some pollutants with respect to sampling and chemical analysis is considered. LÄS MER

  4. 18. On the treatment of acute appendicitis in children

    Författare :Jan F Svensson; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Acute appendicitis is a common condition in children and the treatment of this condition is both straightforward and complex at the same time. An appendectomy is the most common acute surgical intervention in children and the vast majority of children make a swift recovery without any complications. LÄS MER

  5. 19. Modeling of Cold Pilgering of Stainless Steel Tubes

    Författare :Yağız Azizoğlu; Lars-Erik Lindgren; Jonas Edberg; Per Gradin; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Cold pilgering; finite element method; Hållfasthetslära; Solid Mechanics;

    Sammanfattning : Cold pilgering is a complex forming process used to produce seamless tubes in terms of modeling due to the complexity in kinematic of tools, friction condition and material behavior. The process development has mostly been based on simple formulas and costly full-scale tryouts. LÄS MER

  7. 20. Mechanism-based flow stress model for Ti-6Al-4V : applicable for simulation of additive manufacturing and machining

    Författare :Bijish Babu; Lars-Erik Lindgren; Jean-Philippe Ponthot; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Material modeling; Ti-6Al-4V; dislocation density; vacancy concentration; additive manufacturing; hot forming; heat treatment; Material Mechanics; Materialmekanik;

    Sammanfattning : Ti-6Al-4V has remarkable properties such as high specific mechanical properties (viz. stiffness, strength, toughness, fatigue resistance), corrosion resistance, biocompatibility etc. These properties make it attractive for applications in aerospace, chemical industry, energy production, surgical implants, etc. LÄS MER