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Propagation of transient electromagnetic waves in time-varying media - Direct and inverse scattering problems

Wave propagation of transient electromagnetic waves in time-varying media is considered. The medium, which is assumed to be inhomogeneous and dispersive, lacks invariance under time translations. The spatial variation of the medium is assumed to be in the depth coordinate, i.e., it is stratified. The constitutive relations of the medium is a time integral of a generalized susceptibility kernel and

A General Method for Defining and Structuring Buffer Management Problems

In an industrial plant, availability is an important factor since increased availability often gives an increase of final production, which in many cases means an increased profit for the company. The purpose of using buffer tanks is to increase the availability either by separating production units from each other or by minimizing flow variations. However, the methods for achieving this goal is n

A green future with thawing permafrost mires? : a study of climate-vegetation interactions in European subarctic peatlands

Popular Abstract in Swedish Projektioner om framtida klimat i Arktis och subarktis tyder på att drastiska förändrinar väntar regionen under det närmaste århundradet. Inte bara temperaturen spås öka utan även nederbörd, och då framför allt nederbörden under vinterhalvåret. Dessa förändringar kommer sannolikt att ha stor inverkan på miljön i Arktis och subarktis, och stora forksningsansträngningar hClimate projections indicate that Arctic and sub-Arctic regions are facing a significant change in climate during the 21st century. With warmer temperatures precipitation is also expected to increase, and in particular winter precipitation. These changes are likely to have large impacts on the Arctic and subarctic environment, and extensive research has focused on ecosystem-climate interactions in

De vuxna är en av de viktigaste förklaringarna till kränkningarna

Tyckare och experter förfäras över det hemska nätet och de ohyfsade ungdomarna. Men det kommer någonstans ifrån. Barn gör inte som vuxna säger, de gör som vuxna gör. Det skriver Marcin de Kaminski, nätforskare och doktorand i rättssociologi, och Katia Wagner, frilansjournalist och föreläsare kring ungas vardag på internet.

A Component-Based Approach to Localization and Collision Avoidance for Mobile Multi-Agent Systems

In the RUNES project a disaster relief tunnel scenario is being developed in which mobile robots are used to restore the radio network connectivity in a stationary sensor network. A component-based software development approach has been adopted. Two components are described in this paper. A localization component that uses ultrasound and dead reckoning to decide the robot positions and a collision