A density-matrix theory is employed to study dynamical effects in a THz quantum cascade laser. Varying the tunnel coupling across the injection barrier by changing the barrier width, different regimes are distinguished where stationary and dynamics-induced localization effects are found and discussed.

The conceptual shift in the expectations of wireless users towards multimedia andgroup-oriented computing has a significant impact on today̕s networks in terms of needfor mobility, quality of service (QoS) and multicast routing. Mobile ad hoc networks can provide users with these features. However, it is imperative for them to combine QoS andmulticast routing strategies in order to utilize the wir

In this study we tested the relevance of the generational hypothesis, i.e. whether the era in which household members grew up matters when understanding and predicting their behaviour, on a sample of 600 Swedish households. These households participated in a survey where they answered questions about their own energy-related residential energy behaviour. The answers were analysed for differences b

Based on observations of the rhythmic structure of L2-speech produced by L1-speakers of Albanian – which suggest the occurrence of transfer – a study is presented here that compares durational aspects between the two languages. In order to do this, speech read by Swedish and Albanian L1-speakers was recorded and investigated, and normalized durational factors were analysed. The results, however, d

This paper suggests that many of Gurvitch's ideas, which were originally presented in an abstract fashion, are still highly pertinent to socio-legal analysis. They may be employed in empirical research in a revised form, which would make them receptive to operationalisation. To this end, I shall focus on some of the main theoretical ideas developed by Gurvitch, reinterpreting them critically and i

The Waste Electrical and Electronic Equipment (WEEE) Directive of the European Commission places the responsibility on producers to finance collection and treatment of waste deposited at collection facilities after 13 August 2005, on a collective or individual basis. The research identifies practical steps that are needed for producers to address WEEE from private households on an individual, rath

Popular Abstract in Swedish Denna avhandling berör storskalig genetisk variation och fylogeni hos arterna i växtsläktet Alisma (svaltingar). Den naturliga utbredningen för detta släkte av vatten- eller sumpväxter inskränker sig till norra halvklotets tempererade områden. Den vanligaste arten i större delen av Europa är Alisma plantago-aquatica (svalting eller kranssvalting som den ibland också kalIn the present thesis the phylogeny and patterns of genetic diversity of the plant genus Alisma (Alismataceae) were investigated by means of genetic markers (RAPDs, allozymes, and ITS and trnL sequences). Additionally, morphological studies were carried out in paper IV. All species in the genus were found to be closely related to each other and two major groups of diploid taxa were found: one cont