The present thesis is devoted to the theoretical study of two-dimensional electron systems moving in a modulated lateral periodic potential and a competing perpendicular magnetic field. The three introductory chapters offer a brief exposition of the basic issues in this area -- the description of the electron motion in a prependicular magnetic field, the group of magnetic translations and the comm

Controlled fires are beneficial for the generation of heat and power while uncontrolled fires, like fire incidents and wildfires, are detrimental and can cause enormous material damage and human suffering. Transport phenomena such as buoyant flow, momentum, convective heat and mass transfer as well as chemical reactions between combustible species and oxygen from the surrounding air play important

The purpose of this paper is to investigate the potential of complex or exotic materials in radome and antenna design. The existing analysis methods need to be extended to cope with these materials in generic radome and antenna geometries. This paper focuses on electromagnetic properties of the material, the means of realizations, and the methods of computations. The main objectives of this paper

A new Key Environmental Performance Indicators (KEPIs) approach has been developed considering the perspective of a designer who may like to improve the environmental performance of the products but has limited resources and understanding of complex environmental issues. This approach empowers the designer with indicators like the area of PWB, the amount of precious metals etc which account for th

The purpose of this paper is to discuss how theories of social and intellectual development of scientific fields can be used to analyze LIS, and especially its relationship to other research areas and the library and information field of practice. Scientific fields can be seen as reputational work organizations, where degrees of task uncertainty and mutual dependency control the coordination and d

The demand for improved models for simulation of mechanical problem is today very great, especially since today's computer capacity makes it possible to simulate large and complicated problems. In some applications, temperature effects and the heat generated from inelastic deformation can not be neglected in order to achieve a good accuracy of the simulation. In this thesis, a model for simulatio

We present fully self-consistent results for the self-energy of the electron gas within the GW approximation. This means that the self-consistent Green’s function G, as obtained from Dyson’s equation, is used not only for obtaining the self-energy but also for constructing the screened interaction W within the random-phase approximation. Such a theory is particle and energy conserving in the sense

In twentieth-century music scholarship, those of Franz Schubert’s songs from the 1810s that form sectional musical structures have normally been presented as being unfortunately dependent on aesthetically disparaged eighteenth-century models. Authors have often treated these songs succinctly, preferring instead to invest their energy in the “masterworks” of Schubert’s later years. The present thes