Sökning: "Wing"

Visar resultat 26 - 30 av 212 avhandlingar innehållade ordet Wing.

1. 26. Dynamics of the aphid-ant mutualism

   Författare :Karolina Tegelaar; Olof Leimar; Judith Bronstein; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; mutualism; transgenerational; aphids; aphid-ant; conflict of interest; E -β-farnesene; phenotypic plasticity; predation risk; wing induction; maternal effect; reproductive investment; embryo size; etologi; Ethology;

   Sammanfattning : An appreciation of the role of mutualism is essential when studying ecology and evolution in most ecosystems. Information covering aspects of mutualistic interactions can serve as a complement to the somewhat one-sided perspective from the 1950’s and 60’s that is used when teaching biology. LÄS MER

3. 27. On the Scattering Reduction of an Aircraft Wing Profile Enclosing an Antenna

   Författare :Alireza Motevasselian; Lars Jonsson; Daniel Sjöberg; KTH; []
   Nyckelord :;

   Sammanfattning : In this thesis we study the radar cross section reduction and transparency of anantenna radome placed in the front part of an aircraft wing. The antenna, notstudied here, is a linearly polarized antenna operating at 1 GHz with abandwidth of 30%. LÄS MER

4. 28. 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

5. 29. Essays on Politics and Health Economics

   Författare :Linuz Aggeborn; Eva Mörk; Mikael Elinder; Kaisa Kotakorpi; Uppsala universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Fluoride; Cognitive ability; Non-cognitive ability; Income; Education; Employment; Dental health; Political Leadership; American politics; Regression discontinuity; Voter turnout; Local public finance; Sweden; Finland; Right-wing populism; welfare chauvinism; Economics; Nationalekonomi;

   Sammanfattning : Essay I (with Mattias Öhman): Fluoridation of the drinking water is a public policy whose aim is to improve dental health. Although the evidence is clear that fluoride is good for dental health, concerns have been raised regarding potential negative effects on cognitive development. LÄS MER

7. 30. Numerical studies of receptivity, stability and transition of wing and turbine blade boundary layers

   Författare :Luca De Vincentiis; Ardeshir Hanifi; Dan S. Henningson; Stefania Cherubini; KTH; []
   Nyckelord :Teknisk mekanik; Engineering Mechanics;

   Sammanfattning : In the present thesis, receptivity, stability and laminar-turbulent transition of different boundary-layer flows are addressed and investigated by means of direct numerical simulations. In particular, flows over a wing and a low-pressure-turbine (LPT) blade have been the main focus. LÄS MER