Search for dissertations about: "caustics"

Found 5 swedish dissertations containing the word caustics.

2. 1. Towards Fully Dynamic Surface Illumination in Real-Time Rendering using Acceleration Data Structures

   Author : Pierre Moreau; Parallella System; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Computer graphics; Real-time; Ray tracing; Caustics; Global illumination;

   Abstract : The improvements in GPU hardware, including hardware-accelerated ray tracing, and the push for fully dynamic realistic-looking video games, has been driving more research in the use of ray tracing in real-time applications. The work described in this thesis covers multiple aspects such as optimisations, adapting existing offline methods to real-time constraints, and adding effects which were hard to simulate without the new hardware, all working towards a fully dynamic surface illumination rendering in real-time. READ MORE

4. 2. Physical modelling of acoustic shallow-water communication channels

   Author : Elin Svensson; Ilkka Karasalo; Finn Jensen; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; underwater acoustics; hydroacoustics; time variability; ray tracing; Gaussian beam summation; sound propagation models; shallow water; waveguides; caustics; underwater communication; undervattensakustik; hydroakustik; tidsvariabilitet; strålgång; gaussisk strålsummation; ljudutbredningsmodeller; grunt vatten; vågledare; kaustikor; undervattenskommunikation; Acoustics; Akustik;

   Abstract : Akustiska kanaler för undervattenskommunikation är flervägskanaler där ljudet reflekteras från havets yta och botten och bryts vid ljudhastighetsförändringar. I grunt vatten är impulssvaret långt jämfört med symbolernas tidslängd i ett utskickat meddelande. READ MORE

5. 3. Rotating relativistic models of the universe : construction and interpretation

   Author : Egils Sviestins; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES;

   Abstract : This thesis summarizes and gives the background to some accompanying papers dealing with the following problems.Some cosmological models, e.g. that of Gödel, indicate that there is a connection between rotation and the existence of causality violating closed time-like curves. READ MORE

6. 4. Topics in Analysis and Computation of Linear Wave Propagation

   Author : Mohammad Motamed; Olof Runborg; Shi Jin; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Numerical analysis; Numerisk analys;

   Abstract : This thesis concerns the analysis and numerical simulation of wave propagation problems described by systems of linear hyperbolic partial differential equations. A major challenge in wave propagation problems is numerical simulation of high frequency waves. READ MORE

7. 5. Frequency comb Brillouin microscopy

   Author : Felipe Ademir Alemán Hérnandez; Göteborgs universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Brillouin light scattering; optics; spinwave spectroscopy; phonon spectroscopy; microscopy; Fabry-Perot interferometer; Frequency comb;

   Abstract : Brillouin light scattering (BLS), an almost a century-old technique, has evolved into a powerful and versatile method to study acoustic and magnetic phenomena down to the nanometer size scale. Presently, BLS can be applied in fields as diverse as acoustics, spintronics, geosciences, and biophysics. READ MORE