Avancerad sökning

Hittade 4 avhandlingar som matchar ovanstående sökkriterier.

  1. 1. Leakage mechanisms in static seals subjectecd to reciprocating vibration

    Författare :Filip Rosengren; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; O-ring; vibration; static seals; leakage; EHD; contact pressure; surface roughness; elastohydrodynamic; square-ring; compact seals;

    Sammanfattning : .... LÄS MER

  3. 2. Advanced measurement and modelling methods for noise source analysis

    Författare :Matti Rantatalo; Mats Åbom; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Teknisk akustik; Engineering Acoustics;

    Sammanfattning : In daily life sound is a vital dimension for the perception of the world around us but can in some cases be considered as annoying, irritating, or even harmful. In these cases the sound is labelled as noise and can be addressed in two ways, either by insulating the noise problem from the receiver (person) or by altering the source. LÄS MER

  4. 3. Ecology and Conservation of the Baltic Proper Harbour Porpoise

    Författare :Ida Carlén; Anders Angerbjörn; Julia Carlström; Martin Biuw; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Harbour porpoise; Baltic Sea; distribution; abundance; bycatch; conservation policy; zoologisk ekologi; Animal Ecology;

    Sammanfattning : The Baltic Proper harbour porpoise (Phocoena phocoena) population is listed by IUCN as Critically Endangered, but conservation action has been lacking for decades, partly due to very limited knowledge on important ecological parameters such as distribution range and abundance. This thesis provides some of the information needed for implementing effective conservation. LÄS MER

  5. 4. Severe hypoxemia during apnea in humans : influence of cardiovascular responses

    Författare :Peter Lindholm; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Diving response; breath holding; bradycardia; vasoconstriction; hypoxia;

    Sammanfattning : When a diving human holds his or her breath, the heart beat slows and the blood vessels constrict in large portions of the body. In diving mammals such as seals, similar responses effectively conserve oxygen for the brain, enabling them to dive very deep and to stay underwater for a long time. LÄS MER