Sökning: "pressure standard"

Visar resultat 1 - 5 av 338 avhandlingar innehållade orden pressure standard.

  1. 1. Intraocular pressure : clinical aspects and new measurement methods

    Författare :Gauti Jóhannesson; Christina Lindén; Per Hallberg; Anders Eklund; Boel Bengtsson; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Intraocular pressure; glaucoma; tonometry; ISO; LASEK; CCT; curvature; Ophtalmiatrics; Oftalmiatrik; Ophtalmology; oftalmiatrik;

    Sammanfattning : Intraocular pressure (IOP) measurement is a routine procedure and a fundament in glaucoma care. Elevated IOP is the main risk factor for glaucoma, and to date, reduction of IOP is the only possible treatment. In a retrospective clinical material, the prevalence of open angle glaucoma was estimated on the west coast of Iceland. LÄS MER

  3. 2. Fabry-Pérot based refractometry : development of a transportable refractometer for assessment of gas pressure

    Författare :Clayton Forssén; Ove Axner; Isak Silander; Martin Zelan; Leslie Pendrill; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; fabry-pérot; refractometry; optical resonator; transportable; pressure standard; gamor; pressure; metrology; ring comparison; si; pascal; quantumpascal; fysik; Physics;

    Sammanfattning : A unified description of physical phenomena through measurement science is one of the foundational pillars in a global society. The International System of Units (SI) is the most widely used system of units and since its redefinition in 2019, all units encompassed by it are based on fundamental physical constants. LÄS MER

  4. 3. Preventing pressure ulcers by assessment of the microcirculation in tissue exposed to pressure

    Författare :Sara Bergstrand; Margareta Lindgren; Anna-Christina Ek; Maria Engström; Lars-Göran Lindberg; Fredrik Huss; Linköpings universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Pressure ulcer; photoplethysmography; laser Doppler flowmetry; non-invasive; tissue blood flow; reactive hyperemia; pressure-induced vasodilation; interface pressure; risk assessment;

    Sammanfattning : The overall aim of this thesis was to combine optical methods into a system with the ability to simultaneously measure blood flow changes at different tissue depths. The goal of such a system was to reveal vascular mechanisms relevant to pressure ulcer etiology under clinically relevant conditions and in relation to the evaluation of pressure-redistribution support surfaces. LÄS MER

  5. 4. Pulse-Synchronous Intramuscular Pressure Oscillations

    Författare :Andreas Nilsson; Göteborgs universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; compartment syndrome; chronic anterior compartment syndrome; intramuscular pressure; pulse-synchronous oscillations in intramuscular pressure; ; intramuscular arterial pulsations; fiber-optic technique;

    Sammanfattning : Background Intramuscular pressure (IMP) is measured in studies of tissue nutrition and in the diagnosis of compartment syndromes. Patients with compartment syndromes have an elevated IMP due to increased volume in a muscle compartment. LÄS MER

  7. 5. Preferences Under Pressure : Conflict, Threat Cues and Willingness to Compromise

    Författare :Eric Skoog; Magnus Öberg; Hanne Fjelde; Thomas Zeitzoff; Uppsala universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Evolutionary psychology; Conflict; Threat perception; Social preferences; Peace and Conflict Research; Freds- och konfliktforskning;

    Sammanfattning : Understanding how preferences are formed is a key question in the social sciences. The ability of agents to interact with each other is a prerequisite for well-functioning societies. LÄS MER