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Injection schemes in THz quantum cascade lasers under operation

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

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42 volumes of early printed sermons (incunabula) reproduced in full on microfiche. Most of the sermons are in Latin, but two volumes are in German. This Unit is a supplement to Units 31-33 (Sermons: Parts I-III) published in the year 2000.

From enlightened participation to liberal professionalism: On the historiography of the press as a resource for legitimacy

The article presents and analyses the editorial ideals and practices of the Enlightenment press with regard to their participatory elements. The decline of these ideals and practices, during the era of the establishment of the modern press in the 1820s, 1830s and 1840s, is discussed with regard to its advocates’ self-legitimating ambitions. These professional efforts were carried out in various wa

Utveckling av mätinstrument för registrering av säkerhetskritiska händelser i motorfordon

Ett mätinstrument för registrering av trafikkonflikter i fordon via ”Jerk” har tagits fram. Metoden bygger på sambandet mellan ”Jerk” (en plötslig förändring i retardationen) och trafikkonflikt. Utrustningen består av en accelerometer, en liten videokamera, GPS samt datalogg för registrering av händelser (bildsekvens och kördata som föregick en säkerhetskritisk händelse). Resultaten från testkörni