Sökning: "flight speed"

Visar resultat 1 - 5 av 37 avhandlingar innehållade orden flight speed.

  1. 1. Birds in the Flow: Flight Mechanics, Wake Dynamics and Flight Performance

    Detta är en avhandling från Mikael Rosén, Ecology Building, SE-223 62 Lund, Sweden

    Författare :Mikael Rosén; Lund University.; Lunds universitet.; [2003]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Djurekologi; Animal ecology; Eleonora s falcon.; hunting; optimum wingspan; tail posture; wingbeat kinematics; wake topology; DPIV; flight performance; wake dynamics; flight mechanics; wind tunnel; Flight; bird;

    Sammanfattning : I share my fascination of bird flight with many others, and here I summarise my thesis on the subject. This thesis emphasises the mechanics of bird flight by focusing on flight mechanics, wake dynamics and flight performance. LÄS MER

  2. 2. Go with the flow : visually mediated flight control in bumblebees

    Detta är en avhandling från Lund University, Faculty of Science, Department of Biology

    Författare :Nellie Linander; Lund University.; Lunds universitet.; [2017]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; insect; vision; Bombus terrestris; flight control; optic flow; centring; flight speed; height; viewing angle; learning flight; Insect; vision; Bombus terrestris; flight control; optic flow; centring; flight speed; height; viewing angle; learning flight;

    Sammanfattning : Despite their small brains and tiny eyes, flying insects are capable of detecting and avoiding collisions with moving obstacles, and with remarkable precision they navigate through environments of different complexity. For this thesis, I have investigated how bumblebees use the pattern of apparent image motion that is generated in their eyes as they move through the world (known as optic flow), in order to control flight. LÄS MER

  3. 3. Flight Behaviour of Passerines on Nocturnal Migration

    Detta är en avhandling från Department of Biology, Lund University

    Författare :Cecilia Nilsson; Lund University.; Lunds universitet.; [2015]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Bird migration; Passerines; Flight Behaviour; Tracking radar; Optimal migration; Flight speed; Airspeed; Wind drift; Nocturnal migration; Coastline effects; Flight directions; Reverse migration;

    Sammanfattning : Many passerines migrate during the night and at high altitudes, making their migration difficult to observe. By using tracking radars we have been able to make exact observations of the flight behaviour of passerines on nocturnal migration, which has enabled us to test several hypotheses about adaptive values and constraints regarding migratory behaviour in different ecological contexts. LÄS MER

  4. 4. Escape flight in butterflies

    Detta är en avhandling från Stockholm : Department of Zoology, Stockholm University

    Författare :Maria Almbro; Stockholms universitet.; [2009]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Flight; Lepidoptera; gamete load; lipid accumulation; predation risk; hibernation; NATURAL SCIENCES Biology; NATURVETENSKAP Biologi; zoologi; Zoology;

    Sammanfattning : Flight is considered to be the overarching reason for the enormous diversity and world-wide abundance of insects. Not only does flight enable great distances to be covered and new areas to be colonised, flying has also evolved to be important in most adult life-history characteristics from reproduction to anti-predator strategies. LÄS MER

  5. 5. In the wake of a bird - Quantifying aerodynamic performance of avian flight

    Detta är en avhandling från Department of Biology, Lund University

    Författare :Marco Klein Heerenbrink; Lund University.; Lunds universitet.; [2015]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; animal flight; flight performance; gliding; powered flight; wing morphology; aerodynamics; biomechanics; birds; jackdaw; Corvus monedula; wind tunnel; PIV;

    Sammanfattning : Flight is an expensive form of locomotion, but also offers the ability to travel great distances at relatively low cost. Birds have developed various adaptations for optimizing flight performance. The main aim of this thesis is to identify how morphological variables in birds affect aerodynamic drag and flight performance. LÄS MER