Sökning: "tilt control"

Visar resultat 16 - 20 av 41 avhandlingar innehållade orden tilt control.

  1. 16. Effects of physical activity and gravitational stress on cardiovascular control

    Författare :Patrik Sundblad; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :leg exercise; posture; blood pressure; heart rate; cardiovascular model; heart function; stroke volume; tilting; orthostasis; simulated weightlessness; long-term hypokinesia;

    Sammanfattning : The long-term goal of the present work was to characterize the responses to gravitational challenges in exercising humans after long-term head-down-tilt bedrest (HDT). HDT is a simulation of weightlessness with respect to effects on the systemic circulation, and previous studies in resting men have suggested that impairments of arterial baroreflexes contribute to the orthostatic intolerance seen after HDT and spaceflight. LÄS MER

  3. 17. Neural mechanisms for the visual control of spatial orientation and locomotion : electrophysiological and behavioural studies of the supraspinal control of posture and steering in the lamprey central nervous system, with reference to visuo-motor mechanisms

    Författare :Fredrik Ullén; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Neural mechanisms for the supraspinal control of posture and steering, in particular visuo-motor control and visuo-vestibular interaction in postural control, were investigated, using the lamprey as a model system. Behavioural experiments on intact and chronically lesioned animals, intra- and extracellular recordings in vitro and retrograde staining of neurons with horseradish peroxidase were utilized. LÄS MER

  4. 18. Apnea, small for date and autonomic imbalance : risk factors in relation to SIDS

    Författare :Ann Edner; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Sudden Infant Death Syndrome SIDS ; Apparent Life Threatening Event ALTE ; Small for Gestational Age SGA ; Tilt test; Heart Rate Variability HR V ;

    Sammanfattning : SIDS (Sudden Infant Death Syndrome) is defined as an infant who has died suddenly and its cause "remains unexplained after a thorough case investigation, including performance of a complete autopsy, examination of the death scene, and review of the clinical history". An infant who during sleep has been found apneic, pale or cyanotic and limp, and has required either vigorous stimulation or cardiopulmonary resuscitation is defined to have been affected of an Apparent Life Threatening Event (ALTE). LÄS MER

  5. 19. Bandit Methods for Network Optimization : Safety, Exploration, and Coordination

    Författare :Filippo Vannella; Alexandre Proutiere; Vincent Tan; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : The increasing complexity of modern mobile networks poses unprecedented challenges to their optimization. Mobile Network Operators (MNOs) need to control a large number of network parameters to satisfy the users’ demands. LÄS MER

  7. 20. Functional Interfaces in Epitaxial YBa2Cu3O7-δ with Artificial Grain Boundary Junctions

    Författare :Henrik Pettersson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : The properties of superconducting devices based on grain boundaries in YBa2Cu3O7-δ (YBCO) thin films are determined by the atomic structure of the grain boundary plane. To obtain these devices based on single grain boundaries, biepitaxial fabrication techniques has been used. LÄS MER