Essays about: "raven"

Showing result 11 - 15 of 23 essays containing the word raven.

  1. 11. Taxonomy of the Rufous-naped lark (Mirafra africana) complex based on song analysis

    University essay from Uppsala universitet/Institutionen för biologisk grundutbildning; Uppsala universitet/Zooekologi

    Author : Marianne Kristine Nymark; [2021]
    Keywords : rufous-naped; lark; mirafra; africana; systematics; taxonomy; ecology; zoology; song analysis; subspecies; integrative taxonomy; clinal variation; LDA; post hoc Tukey HSD test; Raven Pro;

    Abstract : The Rufous-naped lark Mirafra africana complex consists of 22 subspecies spread across the African continent. Several of the subspecies have recently been suggested to potentially be treated as separate species. In this study a comparative analysis was done on the song from seven of the subspecies: M. a. READ MORE

  3. 12. Development of a Low Speed Wind Tunnel Test Campaign

    University essay from KTH/Flygdynamik

    Author : Siwat Suewatanakul; [2021]
    Keywords : Aerospace; wind tunnel testing; aerodynamics; UAV; boundary corrections; support interference; CFD; Ansys Fluent; Aerospace; vindtunneltestning; aerodynamik; UAV; gränskorrigeringar; stödstörningar; CFD; Ansys Fluent;

    Abstract : This study was performed to investigate aerodynamic characteristics of the 37.5% scaled­ down Green Raven MK18 airframe, to evaluate boundary corrections method, and to investigate on support interference. READ MORE

  4. 13. Mechanical Design, Analysis, and Manufacturing of Wind Tunnel Model and Support Structure

    University essay from KTH/Lättkonstruktioner

    Author : Sara Ghika; [2021]
    Keywords : Aerospace; wind tunnel testing; lightweight structures; UAV; Mekanisk Design; Analys och Tillverkning av Vindtunnelmodell och Stödstruktur;

    Abstract : This volume covers the phases from design to manufacturing of a wind tunnel test support structure for a conceptual blended wing-body UAV designed by KTH Green Raven Project students. The innovative aircraft design demonstrates sustainability within aviation by utilizing a hybrid electric-fuel cell propulsion system. READ MORE

  5. 14. Development of a CFD model and methodology for the internal flow simulation in a hydrogen-powered UAV

    University essay from KTH/Flygdynamik

    Author : Alessandro Porcarelli; [2021]
    Keywords : Fluid-dynamics; Internal Flow; Scalar Transport; UAV; Fuel Cells; OpenFOAM; Pointwise; Vätskedynamik; internt flöde; skalär transport; UAV; bränsleceller; OpenFOAM; Pointwise;

    Abstract : In the context of an aviation industry whose top priority is to face the sustainability challenge, the growing civil UAV branch is not an exception. Hydrogen-powered UAVs equipped with PEM (Polymer Electrolyte Membrane) fuel cells are more and more frequently identified as the most convincing and promising technology, particularly for long-endurance mission requirements. READ MORE

  6. 15. Unmanned Aerial Vehicle Powered by Hybrid Propulsion System

    University essay from KTH/Skolan för kemi, bioteknologi och hälsa (CBH)

    Author : Elsa Åkesson; Maximilian Kempe; Oskar Nordlander; Rosa Sandén; [2020]
    Keywords : UAV; PEMFC; Energy Management Strategy; Simulink; Fuel Cell; Hybrid Propulsion System;

    Abstract : I samband med den globala uppvärmningen ökar efterfrågan för rena och förnybara bränslen alltmer i dagens samhälle. Eftersom flygindustrin idag är ansvarig för samma mängd växthusgaser som all motortrafik i Sverige, skulle ett byte till en avgasfri energikälla för flygfarkoster vara ett stort framsteg. READ MORE