In this paper an order reduction method for spatially distributed models is presented. Such systems may be modeled as two nodes interacting with each other through feedback. A model of one of the nodes reduced in such a way, that the closed loop performance is approximated. The method exploits a coprime factor description of the closed loop model and semidefinite programming. The method is related

Popular Abstract in Swedish Utforskar äldre och funktionshindrades behov av planeringsinformation i kollektivtrafiken och diskuterar huruvida information kan bidra till tillgängligheten. En omfattande enkätundersökning genomfördes för att validera tidigare genomförda fokusgruppsintervjuer om äldre och funktionshindrades informationsbehov. Resultaten visar att det finns ett behov av information blaExplores elderly and disabled people's travel information requirements when planning a journey by public transport and discusses the potential of information to improve access to the public transport system. Quesionnaire study in order to validate an earlier focus-group interview study about elderly and disabled people's travel information requirements. Results show a need for travel information t

This work presents the fabrication and characterization of 3 dimensional electrodes from pyrolysed carbon with spacing and diameter approaching the resolution limit of standard UV photolithography. Our carbon pillar arrays have a diameter of 1.4 µm, spacing of 5 µm and aspect ratio of about 8. We show their characterization by a variety of techniques providing a complete summary of their electro-m

Bandwidth is an important parameter in many metamaterial applications. It has been shown that Herglotz functions and sum rules offer a powerful methodology to analyze the trade-off between bandwidth and design parameters. Here, this approach is described for the temporal dispersion of constitutive relations and high-impedance surfaces.

Scattering of electromagnetic waves by discrete, randomly distributed objects is addressed. In general, the non-intersecting scattering objects can be of arbitrary form, material and shape. The main aim of this paper is to calculate the coherent reflection and transmission characteristics of a finite or semi-infinite slab containing discrete, randomly distributed scatterers. Typical applications o

Recension av Jonathan Brents Stalins arkiv. Sökandet efter det nya Ryssland.

Low-dimensional III-V semiconductor nanoscale structures grown by epitaxial processes have emerged as a new class of materials with great promise for various device applications. This thesis describes explorations into the heteroepitaxial growth of III-V semiconductor materials in combination with other III-V materials and in combination with the commonly used Si material, in both thin layer and n