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Proton exchange membrane fuel cell (PEMFC) systems have been investigated as alternative power sources for the stationary and automotive applications. However, they do not appear on the market yet. One of the main reasons is the difficulty of the water/thermal management in the system. Several water recovery schemes have been proposed to overcome this difficulty and to simplify the system configur
Sammanfattningsvis kan vi konstatera att den tekniska utvecklingen avseende IT-hjälpmedel och bostadsanpassningar för de närmaste kommande åren inte främst är en teknisk fråga. Visserligen pågår en utveckling av tekniska tillämpningar med stor potential a
When constructivism gives up reality as a way of accounting for representations it looses a powerful tool of explanation. Why do we have the representations we have? How are they interrelated? This article attempts to investigate what possible means a constructivistic theory has to maintain the distinction between representations and experience, between memory and imagination, and between correct
Utvecklingen vad gäller halterna av marknära ozon i norra Europa under de senaste drygt tjugo åren karakteriseras av att de högsta halterna har minskat medan de lägsta och medelhöga halterna har ökat. Stigande hemisfäriska bakgrundshalter förklarar troligen de stigande låga till måttliga ozonhalterna.Årsmaximum av glidande 8 timmars ozonmedelhalt minskar på ett statistiskt säkerställt sätt i södra
In many Voice over IP (VoIP) systems, the end-to-end voice Quality of Service (QoS) is largely dictated by the packet loss rate and the Packet Loss Concealment (PLC) method at the receiver. Typical PLC algorithms are usually based on simple signal extrapolation methods that can produce perceptually annoying artifacts. We present a taxonomy of PLC artifacts that degrade voice quality, and demonstra
The paper describes a novel extraction procedure for lipopolysaccharides (LPS) from Salmonella enterica subsp. enterica (PCM 2266). Process parameters for the extraction of LPS from bacterial mass were optimized by carrying out a two-level fractional design experiment. Four parameters, namely temperature, CO, flow rate, pressure and co-solvent composition were analyzed. The best crude extract yiel
With a worldwide increase in disasters, the effects of climate change are already being felt, and it is the urban poor in developing countries that are most at risk. There is an urgent need to better understand the factors that determine people’s capacity to cope with and adapt to adverse climate conditions. This paper examines the influence of formal education in determining the adaptive capacity
In line with current tendencies of ‘new modes of governance’, this essay introduces judicial tools, which strike a balance between the respect for national autonomy in individual assessments and the effective implementation of Community law. The balance is struck through the demands of structural guarantees; administrative safeguards, which weed out arbitrary national decision-making. These admini
