Sökning: "PPG"

Visar resultat 1 - 5 av 24 avhandlingar innehållade ordet PPG.

  1. 1. Disordered matter: From Ionic Glasses to Proteins

    Författare :Charbel Tengroth; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; liquid-glass transition; PPG; disorder; B2O3; neutron scattering; hemoglobin; time-resolved resonance Raman scattering; CKN;

    Sammanfattning : Understanding the glassy state is regarded as one of the ten most important questions in physics in the 21st century [1]. This thesis deals with structure and dynamics of a few model disordered systems ranging from an ionic glass to proteins. The structure of an ionic liquid, Ca0.4K0. LÄS MER

  3. 2. Tissue Blood Flow Responses to External Pressure Using LDF and PPG : Testing a System Developed for Pressure Ulcer Research

    Författare :Sara Bergstrand; Anna-Christina Ek; Margareta Lindgren; Linköpings universitet; []
    Nyckelord :MEDICINE; MEDICIN;

    Sammanfattning : Background: Pressure ulcers are a problem for immobile individuals, and having pressure ulcers impact and restrict the daily and are often associated with pain. Pressure ulcers occur frequently and cause high costs for the health care system. LÄS MER

  4. 3. Respiratory monitoring using reflection mode photoplethysmography : clinical and physiological aspects

    Författare :Lena Nilsson; Robert Hahn; Linköpings universitet; []
    Nyckelord :MEDICINE; MEDICIN;

    Sammanfattning : Photoplethysmography (PPG) is a non-invasive optical technique for monitoring variations in blood volume and blood flow in skin and other tissues. Light from a light-emitting diode is absorbed, scattered and reflected from the skin, and detected by a photodetector as a plethysmogram. The plethysmogram contains variations of different frequencies. LÄS MER

  5. 4. Photoplethysmography in multiparameter monitoring of cardiorespiratory function

    Författare :Anders Johansson; Linköpings universitet; []
    Nyckelord :MEDICINE; MEDICIN;

    Sammanfattning : Photoplethysmography (PPG) is an optical, non-invasive method to assess tissue blood volume/perfusion. When measured on human skin, the PPG signal includes both cardiac synchronous variations (AC) and respiratory induced intensity variations (RIIV). LÄS MER

  7. 5. Non-invasive techniques for assessment of peripheral blood flow at different vascular depths

    Författare :Jimmie Hagblad; Maria Lindén; Mia Folke; Marcus Larsson; Mälardalens högskola; []
    Nyckelord :elektronik; Electronics;

    Sammanfattning : Missing or reduced blood flow can lead to pressure ulcers. Monitoring blood flow in areas prone to pressure ulcer development would be a valuable tool for prevention of pressure ulcers. PPG and LDF are both established non invasive optical techniques that can be used to estimate the changes in blood flow in different tissue volumes. LÄS MER