Sökning: "bats"

Visar resultat 1 - 5 av 14 avhandlingar innehållade ordet bats.

1. 1. Aerodynamic performance in bat flight

   Författare :Jonas Håkansson; Evolutionär ekologi; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Leptonycteris yerbabuenae; Plecotus auritus; Glossophaga soricina; PIV; aerodynamics; wing morphology; bats; wind tunnel; animal flight;

   Sammanfattning : Bats are the only mammals capable of flight, and they are the only animal flyers that are mammals. This thesis focuses on the latter of those facts, and investigates how bats fly, from an aerodynamic perspective. LÄS MER

3. 2. Catching the invisible - aerodynamic tracks and kinematics of bat and bird flight

   Författare :Marta Wolf; Biologiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; flight; bats; birds; kinematics; vertebrates; aerodynamics;

   Sammanfattning : This thesis is about the flight of vertebrates and the studies of different modes of flight. Flight has always fascinated mankind and this fascination gave inspiration for our attempts at flying. LÄS MER

4. 3. Borrowing the Bat's Ear for Automation - Ultrasonic Measurements in an Industrial Environment

   Författare :Gunnar Lindstedt; Industriell elektroteknik och automation; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Automatiska system; control engineering; robotics; Automation; electrostatic transducer; piezoelectric transducer; echolocation; bat; automation; localization; recognition; geometry; distance; measurement; ultrasound; robotteknik; reglerteknik;

   Sammanfattning : This work focuses on measurement principles based on ultrasound for applications in industrial automation. The measurements made are of geometric nature. The methods used are when possible based on experience and/or inspiration from the study of bats. LÄS MER

5. 4. Feathers by day, membranes by night - Aerodynamic performance in bird and bat flight

   Författare :Florian Muijres; Evolutionär ekologi; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; animal flight; aerodynamics; vortex wake; actuator disk; flight performance; span efficiency; bird; bat; wind tunnel; PIV; Pied Flycatcher; Glossophaga soricina; Leptonycteris yerbabuenae;

   Sammanfattning : The efficiency and performance of a flying animal is directly related to the aerodynamics around its body and flapping wings. Here, I have developed methods for quantifying the wake dynamics around a flying animal. The results are used to estimate the aerodynamic performance of flapping flight. LÄS MER

7. 5. Studies in Corpora and Idioms : Getting the cat out of the bag

   Författare :David Minugh; Nils-Lennart Johannesson; Maria Kuteeva; Karin Aijmer; Stockholms universitet; []
   Nyckelord :HUMANIORA; HUMANITIES; Coll corpus; corpora; corpus creation; idioms; idiom variation; idiom-breaking; online newspapers; student newspapers; college newspapers; English language; Engelska språket; English; engelska;

   Sammanfattning : “Idiomatic” expressions, usually called “idioms”, such as a dime a dozen, a busman’s holiday, or to have bats in your belfry are a curious part of any language: they usually have a fixed lexical (why a busman?) and structural composition (only dime and dozen in direct conjunction mean ‘common, ordinary’), can be semantically obscure (why bats?), yet are widely recognized in the speech community, in spite of being so rare that only large corpora can provide us with access to sufficient empirical data on their use.In this compilation thesis, four published studies focusing on idioms in corpora are presented. LÄS MER