Email: [email protected] [email protected] References Simulating global illumination demands for solving the lighting integral of a surface point. Ambient Occlusion (AO): pro: appealing approximation of local occlusion con: no directional information (static gray shadows) Screen Space Directional Occlusion (SSDO) [Ritschel09]: pro: combination of occlusion sampling a...

In this paper we derive a diiusion equation for electron transport in a superlattice. The starting model is a quantum scattering matrix model which relates the phase space density of each superlattice cell with that of the neighbouring cells. Then, in the limit of a large number of cells, a diiusion equation for the particle number density in the position-energy space is obtained, which is of '...

Spectral matching ICA (SMICA) is a source separation method based on covariance matching in Fourier space that was designed to address in a flexible way some of the general problems raised by Cosmic Microwave Background data analysis. However, a common issue in astronomical data analysis is that the observations are unevenly sampled or incomplete maps with missing patches or intentionally maske...

In this paper, we consider the connected split rank one Lie group of real type F4 which we denote by F4. We first exhibit F4 as a group of operators on the complexification of A. A. Albert's exceptional simple Jordan algebra. This enables us to explicitly realize the symmetric space F4/Spin(9) as the unit ball in R with boundary S . After decomposing the space of spherical harmonics under the a...

This paper describes the verification of the recently developed space-angle self-adaptive algorithm for the finite element-spherical harmonics method via the Method of Manufactured Solutions. This method provides a simple, yet robust way for verifying the theoretical properties of the adaptive algorithm and interfaces very well with the underlying second-order, even-parity trasnport formulation...

Harmonics in power distribution system are current or voltage that are integer multiples of fundamental frequency. For example if the fundamental frequency 50 Hz, then the 2-nd harmonics is 100Hz, the 3-rd is 150Hz, etc. A pure voltage or current sine wave has no distortion and no harmonics but non sinusoidal wave has distortion and harmonics. To quantify the distortion, the term total harmonic...

In this manuscript, the author has tried to analyze a study of Variable Frequency Drives. Variable frequency drives are energy saving drives. But they generate harmonics generates. Harmonics introduced by any means affect the performance parameters of any system The presence of harmonics is the system for a long duration & that, too, of higher order affect the various parameters in a Power dist...

This paper presents a new method to find the optimum switching angles in voltage source multilevel converters in order to minimize specific higher order harmonics and decrease the total harmonic distortion (THD) of their output voltage waveform. The output voltage waveform of inverter can either be in the form of staircase or PWM. In order to increase the degrees of freedom and elimination of m...

Self-consistent wave solutions for structures consisting of drifting plasmas and dielectrics are presented and the appearance of growing waves in one of the models is shown. The role of collisions and diffusion is discussed and the direction of future work aimed at devices is indicated. The requirement for velocity matching implies that eventually periodic structures and space harmonics are nee...

We describe the attempt to synthesize emotional speech with a concatenative speech synthesizer using a parameter space covering not only f0, duration and amplitude, but also voice quality parameters, spectral energy distribution, harmonics-to-noise ratio, and articulatory precision. The application of these extended parameter set offers the possibility to combine the high segmental quality of c...