Sökning: "common swift"

Visar resultat 1 - 5 av 8 avhandlingar innehållade orden common swift.

  1. 1. Always on the wing - Fluid dynamics, flight performance and flight behavior of common swifts

    Författare :Per Henningsson; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Apus apus; aerodynamics; animal flight; kinematics; vortex wake; digital particle image velocimetry; DPIV; common swift; tracking radar; wind tunnel; migration; roosting flight;

    Sammanfattning : The aerodynamics and kinematics behind the flight of animals are relatively unknown. Although animal flight has been studied for several hundreds of years, it is only in recent time that we have the technical abilities to study the mechanistic basis of animal flight. LÄS MER

  3. 2. Movement ecology of aerial insectivorous birds : Individual-based studies on swifts and nightjars

    Författare :Gabriel Norevik; Evolutionär ekologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; swift; nightjar; Apus; Caprimulgus; tracking; archival tags; GPS; geolocation; multi-sensor logger; migration; continuous flight; route choice; altitude; lunar cycle; seasonality;

    Sammanfattning : Many birds are predisposed to annually undertake movements over large temporal and spatial scales. They have an efficient flight machinery, demonstrate impressive capacities in storing and burning fuel, and they exhibit necessary orientation and navigational skills. LÄS MER

  4. 3. Localization using Magnetometers and Light Sensors

    Författare :Niklas Wahlström; Fredrik Gustafsson; Bo Bernhardsson; Linköpings universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : Localization is essential in a variety of applications such as navigation systems, aerospace and surface surveillance, robotics and animal migration studies to mention a few. There are many standard techniques available, where the most common are based on information from satellite or terrestrial radio beacons, radar networks or vision systems. LÄS MER

  5. 4. War and Unreason. Bounded Learning Theory and War Duration

    Författare :Marco Nilsson; Göteborgs universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; war duration; security dilemma; offense-defense balance; offensive expectations; offense dominance; defense dominance; Winter War; Continuation War; Iran-Iraq War; Indo- Pakistani War; ideas; rational choice; expected utility; war; bounded learning theory.; war duration;

    Sammanfattning : Why are some wars longer than others? Offense-defense theorists have assumed that wars are shorter and it is more difficult for states to create security when military technology favors the offense and attacking is easier than defending. This study argues that this assumption is wrong on both accounts. LÄS MER

  7. 5. On the treatment of acute appendicitis in children

    Författare :Jan F Svensson; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Acute appendicitis is a common condition in children and the treatment of this condition is both straightforward and complex at the same time. An appendectomy is the most common acute surgical intervention in children and the vast majority of children make a swift recovery without any complications. LÄS MER