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The two main design schemes for Terahertz quantum cascade lasers, based on tunnelling and scattering injection, respectively, are theoretically compared. We apply our simulation package based on the non-equilibrium Green’s function technique. Our results provide a good description of the gain degradation with temperature. Thermal backfilling contributes to decrease of population inversion in both
Event-related potentials were measured in a series of studies where issues concerning attention were of special interest. In particular, the P300 was used as an index of controlled attention. Papers I and III studied nicotine effects on the P300. If nicotine effects were reflected in the P300, decreased latencies and increased amplitudes would be expected. No systematic nicotine effects were found
Although alignment between business strategy and information strategy has been in focus for several years, the research suggests different explanations and differs in how alignment influences business performance. As the title suggests, the aim of the paper is to explore whether both good and had alignment may be linked to better business performance. In this paper, we present results from an inve
Svarte and Piledal are typical Scanian Late Bronze Age cremation cemeteries.The Piledal cemetery has the quality of an enclosed entity used by a limited group of people. Svarte, on the other hand, is a more diffuse conglomeration of burials spread over a wider area. The article also contains a discussion of the impact of excavation methods and find circumstances on archaeological interpretation.
In epidural studies it has been hard to find evidence supporting the outcome benefits of epidural treatment. A lot of epidurals have a high incidence of postoperative malfunctions. Several technical factors can be behind this. By knowing the relevant anatomy, the epidural insertion can be more optimal. Using saline instead of air as loss of resistance medium, a better working epidural with less mo
Both the idea of the self and the idea of memory went through significant changes in the 18th and 19th centuries – developments that in important ways were driven by, and showcased in, the different forms of autobiographical expression popular during this period. With the aim of studying the Swedish context in this regard, the thesis describes a number of typical situations and thematic structures
Pulsed lasers are used for simultaneous single-beam three-dimensional optical trapping of and second-harmonic generation in 50--100-nm nonlinear particles. The emission power of the frequency-doubled light, the trapping stability, and the particle degradation are investigated for KTP and LiNbO3 particles trapped by 25-kHz-repetition-rate Q-switched Nd:YAG and 76-MHz mode-locked Ti:sapphire l a s e
