Sökning: "Inhomogeneity"

Visar resultat 1 - 5 av 85 avhandlingar innehållade ordet Inhomogeneity.

  1. 1. Traces of Repolarization Inhomogeneity in the ECG

    Författare :Milos Kesek; Anders Englund; Bertil Lindahl; Markku Mäkijärvi; Uppsala universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Internal medicine; cardiology; repolarization; ECG; QT dispersion; nondipolar components; T-wave; principal component analysis; repolarization inhomogeneity; Invärtesmedicin; Internal medicine; Invärtesmedicin;

    Sammanfattning : Repolarization inhomogeneity is arrhythmogenic. QT dispersion (QTd) is an easily accessible ECG-variable, related to the repolarization and shown to carry prognostic information. It was originally thought to reflect repolarization inhomogeneity. Lately, arguments have been risen against this hypothesis. LÄS MER

  3. 2. Quantification of pulmonary scintigraphy

    Författare :Jiahua Xu; Göteborgs universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Emphysema; Inhomogeneity; Perfusion; scintigraphy; SPECT; 99mTc-Technegas; Ventilation; V Q;

    Sammanfattning : Modern nuclear medicine techniques, such as SPECT (single photon emission computed tomography), enable quantification and localisation of lung function in small lung elements, but appropriate methods are not yet available. The aim of the present project was therefore to develop and evaluate methods for mapping lung function in planar scintigrams and in SPECT. LÄS MER

  4. 3. Essays on Distance Based (Non-Euclidean) Tests for Spatial Clustering in Inhomogeneous Populations : Adjusting for the Inhomogeneity through the Distance Used

    Författare :Ulla Romild; Johan Lyhagen; Anders Ågren; Jack Cuzick; Uppsala universitet; []
    Nyckelord :Statistics; Clustering; Spatial Point Pattern; Inhomogeneous Density; Statistik;

    Sammanfattning : This thesis consits of four papers dealing with distance based (non-Euclidean) tests for spatial clustering in inhomogeneous populations. The density adjusted distance (DAD), which considers the underlying density, is defined in the first paper. LÄS MER

  5. 4. Durability Aspects of Fast Charging, Mechanical Constraint, and Inhomogeneity in Lithium-Ion Batteries

    Författare :Abdilbari Shifa Mussa; Rakel Wreland Lindström; Göran Lindbergh; Gregory Offer; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Lithium-ion batteries; NMC 111 ; Graphite; Cycle ageing; Fast-charging; Inhomogeneity; Current distribution; Pressure; Curvature; Temperature.; Chemical Engineering; Kemiteknik;

    Sammanfattning : The development of lithium-ion batteries with higher energy and power density, better safety, and lower cost has significantly contributed to the increased market share of electric vehicles (EVs) in the last decade. However, the expectations of end-users of EVs still require a continuous quest for better performance. LÄS MER

  7. 5. Peripheral airway function in asthma and cystic fibrosis. Measurements using inert gas washout methods

    Författare :Henrik Ljungberg; Göteborgs universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; acinar; adults; airway hyperresponsiveness; asthma; children; conductive; functional residual capacity; gas trapping; inert gas washout; infants; peripheral airways; plethysmography; respiratory function tests; ventilation inhomogeneity;

    Sammanfattning : It is increasingly recognised that asthma and cystic fibrosis (CF) frequently involves the peripheral airways. Characteristic features of abnormal peripheral airway function are uneven ventilation distribution and increased gas trapping. LÄS MER