Sökning: "point singularity"
Visar resultat 1 - 5 av 12 avhandlingar innehållade orden point singularity.
1. Numerical analysis for random processes and fields and related design problems
Sammanfattning : In this thesis, we study numerical analysis for random processes and fields. We investigate the behavior of the approximation accuracy for specific linear methods based on a finite number of observations. Furthermore, we propose techniques for optimizing performance of the methods for particular classes of random functions. LÄS MER
2. Accommodating differences : Power, belonging, and representation online
Sammanfattning : How can political participatory processes online be understood in the dynamic, conflicted and highly mediated situations of contemporary society? What does democracy mean in a scenario where inequality and difference are the norms, and where people tend to abandon situations in which they and their interests are not recognized? How can we accommodate differences rather than consensus in a scenario where multiple networks of people are the starting point rather than a single community?In this thesis, these questions are explored through an iterative process in two studies that have used or resulted in three prototypes and one art exhibition. The first study is of communication practices in a global interest community, which resulted in two prototypes: Actory, a groupware that takes differences rather than equality as the starting point for a collaborative tool, and The Affect Machine, a social network where differences are used as a relational capital. LÄS MER
3. Spectra of elliptic operators and applications
Sammanfattning : In this thesis we consider several problems related to elliptic equations. Namely, we investigate Helmholtz and Maxwell's equations in Paper I and Sturm-Liouville spectral problem in Papers II,III. In Paper I we study time-harmonic electromagnetic and acoustic waveguide, modeled by an in�nite cylinder with a non-smooth cross section. LÄS MER
4. A new generalization of the Lelong number
Sammanfattning : We will introduce a quantity which measures the singularity of a plurisubharmonic function $\varphi$ relative to another plurisubharmonic function $\psi$, at a point $a$. We denote this quantity by $ \nu_{a,\psi}(\varphi)$. LÄS MER
5. High order trapezoidal rule-based quadratures for boundary integral methods on non-parametrized surfaces
Sammanfattning : This thesis is concerned with computational methods for solving boundary integral equations (BIE) on surfaces defined without explicit parametrization, called Implicit Boundary Integral Methods (IBIM). Using implicit methods for describing surfaces, such as the level-set method, can be advantageous for complex geometries and problems where the surface evolves over time. LÄS MER
