Sökning: "Echo tracking system"

Visar resultat 1 - 5 av 7 avhandlingar innehållade orden Echo tracking system.

  1. 1. Estimation of synchronization parameters

    Författare :Jaap van de Beek; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Signalbehandling; Signal Processing;

    Sammanfattning : This thesis deals with the estimation of synchronization parameters in {Orthogonal Frequency Division Multiplexing} (OFDM) communication systems and in active ultrasonic measuring systems. Estimation methods for the timing and frequency offset and for the attenuation taps of the frequency selective channel are presented and investigated. LÄS MER

  3. 2. Insight into Coro-Carotid atherosclerotic disease in patients with acute coronary syndrome

    Författare :Rafik B. Shenouda; Michael Y. Henein; Per Wester; Ana Djordjevic-Dikic; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Acute coronary syndrome; Agatston score; Atherosclerosis; Carotid calcifications; Carotid intima media thickness; Coronary calcifications; Echocardiography; Speckle tracking echocardiography; Strain; Strain rate; Tissue Doppler Imaging.; kardiologi; Cardiology;

    Sammanfattning : Background: the arterial tree branches in different parts of human body are sharing the histological and physiological features. Atherosclerosis is a systemic arterial disease, hence is expected to affect to affect more than one arterial system with similar pathologic manifestations. LÄS MER

  4. 3. Smoking and pregnancy : with special reference to preterm birth and the feto-placental unit

    Författare :Nina Kyrklund-Blomberg; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Smoking; Preterm birth; Very preterm birth; Onset of delivery; Placental abruption; Perinatal death; Smoking; Preterm birth; Very preterm birth; Onset of delivery; Placental abruption; Perinatal death; Pulse wave; Vessel stiffness; Echo-tracking system.;

    Sammanfattning : Objective: To study maternal smoking in pregnancy in relation to preterm birth, placental abruption and perinatal mortality in pregnancies with placental abruption, and to pulse wave characteristics in fetal aorta. Methods: Two cohort studies with data on single births obtained from the Swedish Medical Birth Registry (N=311 977 and N=795 459, respectively). LÄS MER

  5. 4. Non-invasive assessment of dynamic properties in human arteries : with special reference to gestation and diabetes

    Författare :Jie Hu; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Acetylcholine; Adolescents; Aorta; Diameter waveforms; Diameter pulse waves; Echo tracking system; Fetal behavioural state; Fetal breathing movements; Gestational diabetes mellitus; Impending birth; Insulin-dependent diabetes mellitus; Laser Doppler; Microcirculation; Pregnancy; Pulse wave velocity; Vascular endothelium; Vascular stiffness; Ultrasound;

    Sammanfattning : Background: The important role played by the intrinsic properties of central arteries in cardiovascular physiology and pathology has been increasingly recognised. Several circulatory disorders are associated with increased arterial stiffness. LÄS MER

  7. 5. Distribution and activity of pelagic fish - acoustic studies in the Baltic Sea

    Författare :Tomas Didrikas; Sture Hansson; Thomas Mehner; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Pelagic; fish; hydroacoustic; distribution; activity; Baltic; Biology; Biologi;

    Sammanfattning : Fisheries agencies around the Baltic Sea use hydroacoustics to assess stock sizes of herring and sprat. These assessments rely on the assumption that the acoustic properties of Baltic clupeids are the same as North Sea herring. LÄS MER