Sökning: "Patrik Pettersson"

Visar resultat 1 - 5 av 7 avhandlingar innehållade orden Patrik Pettersson.

  1. 1. Fluid flow in wood fiber network

    Författare :Patrik Pettersson; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Strömningslära; Fluid Mechanics;

    Sammanfattning : Cellulose material is processed to pulp suspensions and MDF boards in order to produce products such as papers, magazines, laminate floors or door skins. A critical stage of these processes is when the cellulose fiber networks are compressed to specific densities and when most of the fluid originally positioned between and inside the fibers is forced to leave the network. LÄS MER

  3. 2. Fluid flow through and deformation of wood fiber networks

    Författare :Patrik Pettersson; Veronique Michaud; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Strömningslära; Fluid Mechanics;

    Sammanfattning : Cellulose-based commercial items such as paper and laminated flooring are vital to the local economy of northern Sweden. These products are commonly manufactured in suspension where fluids such as water or air are drained through the fiber network in some value-added steps in the manufacturing process. LÄS MER

  4. 3. Design of a total-reflection X-ray fluorescence spectrometer and application to marine algal communities

    Författare :Patrik Pettersson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; ecotoxicology; X-ray beam intensity profile; periphyton; multilayer mirror; trace element analysis; rotating anode; chargecoupled device;

    Sammanfattning : .... LÄS MER

  5. 4. Design of a Total-Reflection X-Ray Fluorescence Spectrometer and Application to Periphyton Communities

    Författare :Patrik Pettersson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TXRF; microalgae; periphyton; total-reflection X-ray fluorescence spectrometry; sample preparation; environmental trace element analysis; nitric acid-hydrogen peroxide digestion; phytoplankton;

    Sammanfattning : The work presented in this thesis deals with the use of total-reflection X-ray fluorescence (TXRF) spectrometry for trace element analysis of periphyton. A TXRF spectrometer was designed and its performance was evaluated with a plankton reference material. For 12 .my. LÄS MER

  7. 5. Have you heard about wire? Monitoring of the wire drawing process

    Författare :Joakim Larsson; Christer Korin; Anton Jansson; Patrik Karlsson; Rachel Pettersson; Diana Janis; Örebro universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Wire drawing; process monitoring; condition monitoring; drawing force; performance monitoring;

    Sammanfattning : Wire made from metal is a fundamental component found in almost every complex product, ranging from a simple pen to a spacecraft. It is used to manufacture nails, screws, springs, rivets, cables, welding electrodes, and numerous other items that surround us daily. LÄS MER