Sökning: "reflection coefficient"

Visar resultat 1 - 5 av 31 avhandlingar innehållade orden reflection coefficient.

  1. 1. Transvascular fluid exchange with application to the brain. An experimental study in cat skeletal muscle and brain

    Författare :Lis Kongstad; Anestesiologi och intensivvård; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Neurologi; neurophysiology; neuropsychology; Neurology; intensivvård; capillary filtration coefficient; Capillary permeability; reflection coefficient; brain edema; dural puncture; Anaesthesiology; Anestesiologi; intensive care; neuropsykologi; neurofysiologi;

    Sammanfattning : This study evaluated transcapillary fluid exchange in the cat brain and in a cat skeletal muscle enclosed in a plethysmograph. A method for determination of capillary permeability (capillary filtration coefficient and reflection coefficient) and effects of transcapillary hydrostatic pressure changes were studied We found that capillary fluid permeability in a tissue can be determined by the capillary filtration coefficient, even when arterial pressure and vascular tone are changed. LÄS MER

  2. 2. Transvascular exchange and organ perfusion with reference to colloid and hypertonic solutions, and to endotoxaemia

    Författare :Staffan Holbeck; Anestesiologi och intensivvård; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; sepsis; mannitol; microdialysis; intestine; hypertonic saline; gut; hydroxyethyl starch; gelatin; endotoxin; fluid therapy; dextran; albumin; capillary filtration coefficient; intensivvård; Anestesiologi; urea; Anaesthesiology; intensive care; SIRS; reflection coefficient;

    Sammanfattning : Changes in vascular permeability can immensely change plasma volume and affect the degree of oedema in the body. In diseases with an increased vascular permeability, adequate fluid therapy is of considerable importance to prevent hypovolaemia. LÄS MER

  3. 3. Vascular effects of prostacyclin in cat skeletal muscle and in the traumatised rat brain

    Författare :Peter Bentzer; Anestesiologi och intensivvård; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; reflection coefficient; cerebral blood flow; hydraulic conductivity; oedema; capilary filtration coefficient; endothelin-1; ATP-dependent potassium channels; Physiology; Fysiologi;

    Sammanfattning : Disturbances in microvascular function may be important for tissue damage in many disease states. Prostacyclin, a substance produced by endothelial cells, is important for the maintenance of normal vascular homeostasis and is a potential drug for treatment of microvascular dysfunction, but indications and optimal dosage remains to be established. LÄS MER

  4. 4. Acoustic Characterization of Turbochargers and Pipe Terminations

    Författare :Heiki Tiikoja; Mats Åbom; Francisco Denia; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; acoustical two-port; turbocharger; transmission loss; sound generation; compressor; turbine; IC-engine; inlet system; exhaust system; flow duct; duct termination; reflection coefficient;

    Sammanfattning : In search for quieter engines there is a need for a better understanding of the acoustic properties of engine intake and exhaust system components. Besides mufflers which have the purpose of reducing pressure pulses originating from the internal combustion (IC) engine, there are many components in a modern car exhaust and intake system, e.g. LÄS MER

  5. 5. Inverse scattering and distribution of resonances on the real line

    Författare :Michael Hitrik; Matematik LTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Mathematics; scattering poles; reflection coefficient; Schrödinger operator; inverse scattering; Matematik;

    Sammanfattning : We study aspects of scattering theory for the Schrödinger operator on the real line. In the first part of the thesis we consider potentials supported by a half-line, and we are interested in the inverse problem of reconstruction of the potential from the knowledge of values of the reflection coefficient at equidistributed points on the positive imaginary axis. LÄS MER