Essays about: "Rotationally symmetric"

Showing result 1 - 5 of 6 essays containing the words Rotationally symmetric.

1. 1. Ray Tracing Algorithm for Dielectric Domes

   University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS)

   Author : Maria Pubill; [2023]
   Keywords : Array antenna; dielectric dome; Ray-Tracing; reflection; absorption losses; matching layers; Arrayantenn; dielektrisk kupol; strålföljning; reflektion; absorptionsförluster; anpassningsskikt;

   Abstract : Almost hemispherical scanning capabilities are required for modern wireless communication systems to produce broad coverage without performance degradation. Phased array antennas are commonly used as a fully-electronic beam-steering solution for its rapidity in beam switching. READ MORE

3. 2. Investigation on how additive manufacturing with post-processing can be used to realize micronozzles

   University essay from Uppsala universitet/Ångström Space Technology Centre (ÅSTC)

   Author : Alan Bugurcu; [2022]
   Keywords : additive manufacturing; micronozzle; micro rocket nozzle; laser-powered powder bed fusion; electropolishing; supersonic micronozzle; supersonic micro rocket nozzle; titanium alloy; titanium-64; Ti-Al6-V4;

   Abstract : This is predominantly a qualitative study on the manufacturing of micronozzles with an additive manufacturing (AM) technique, namely the laser-powered powder bed fusion (PBF-LB).  Manufacturing of micronozzles with standard microelectromechanical system technology often results in 2. READ MORE

4. 3. On the Interaction Between Electromagnetic, Gravitational, and Plasma Related Perturbations on LRS Class II Spacetimes

   University essay from Umeå universitet/Institutionen för fysik

   Author : Philip Semrén; [2021]
   Keywords : ;

   Abstract : In this thesis, we investigate the interaction between electromagnetic, gravitational, and plasma related perturbations on homogeneous and hypersurface orthogonal Locally Rotationally Symmetric (LRS) class II spacetimes. By using these spacetimes, which allow for the inclusion of a non-zero magnetic field, as backgrounds in a perturbative approach, we are able to see interactions between the electromagnetic and gravitational variables already to first order in the perturbations. READ MORE

5. 4. Dissipative Perturbations on LRS Class II Cosmologies Using the 1+1+2 Covariant Split of Spacetime

   University essay from Umeå universitet/Institutionen för fysik

   Author : Philip Semrén; [2020]
   Keywords : ;

   Abstract : By including dissipative fluxes in the description, this thesis extends previous results regarding first order perturbations on homogeneous and hypersurface orthogonal locally rotationally symmetric (LRS) class II cosmologies using the 1 + 1 + 2 covariant split of spacetime. Whereas previous works consider perturbations of perfect fluid type, perturbations pertaining to heat flux and fluid viscosity are here studied with the aim to ascertain their effect on the evolution of the fluid vorticity. READ MORE

6. 5. Dynamics of Discrete Irregular Cosmological Models

   University essay from Stockholms universitet/Fysikum

   Author : Shan Williams Jolin; [2014]
   Keywords : cosmology; discrete; irregular; simulations; dark energy; LRS curve; dynamics; Schwarzschild black holes;

   Abstract : This thesis investigates the dynamics of a set of 8-600 Schwarzschild masses, randomly distributed inside cells which tessellate a 3-sphere. Furthermore the contents of each cell are mirror images of its neighbor. READ MORE