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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.
Alfonso Pecha (b. 1327, d. 1389), Bishop of Spanish Jaén from 1359 to 1368, went to Italy after his resignation. There he made St. Bridget’s acquaintance. Alfonso who was a man of great learning and wide experience became St. Bridget's trusted advisor and assisted her in propagating her great causes (the return of the papacy from Avignon to Rome, a reform of the Church, the founding of a new order
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
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The evaporative gas turbine pilot plant (EvGT) has been in operation at Lund Institute of Technology in Sweden since 1997. This article presents the latest development in the evaporative technology, the evaporation of bio-ethanol in a gas turbine power plant as a means to reduce the emission of greenhouse gases. Bio-ethanol is produced from a feedstock consisting of corn-stover, and the bio-ethano
Många beteenden hos djur kan vara oflexibla och mer eller mindre ”hard-wired” i hjärnan. Sådana beteenden kan vara ändamålsenliga för regelbundna och rytmiska förändringar i naturen, såsom dag och natt, årstider, etc. Men många faktorer är naturligtvis oförutsägbara i naturen. För sådana oförutsägbara förändringar är det bättre för djur att vara flexibla i sitt beteende. Kognition är en process soThe Paridae (tits, titmice and chickadees) is a bird family consisting of both food hoarding and non-hoarding species. Many studies have been conducted on birds that are considered to be cognitively advanced, such as parrots and corvids, whereas much less is known about these small passerines. In this thesis, I have investigated the cognitive abilities of two members of the Paridae family; marsh t
