Fuel cells are promising for future energy systems, since they are energy efficient and, when hydrogen is used as fuel, there are no emissions of greenhouse gases. Fuel cells have during recent years various improvements, however the technology is still in the early phases of development, this can be noted by the lack of dominant design both for singe fuel cells, stacks and for entire fuel cell sy

Åldrandet medför en skiftning i sättet att se sitt hem och sin bostad. Kroppens åldersförändring tillsammans med föreställningar om ålderdomen medför att det egna hemmet uppfattas som ett problem. Hemmet har dock en meningsskapande betydelse, vilket gör att det kan upplevas som svårt att flytta därifrån.

I understand patronage principally as a work of cultural and material support - the support shich was necessary to stage the performance of a piece of music in mayn different contexts. I focus on the fate of an opera, Richard Wagner's Parsifal, a work which was not performed at the Bayreuth festival between 1939 and 1944 because of its emphasis on reconciliation, non-violence and faith, but which

About the struggle between faith and utilitarian aspects in the writings of Carl von Linné.

Popular Abstract in English There is a natural tendency to take advantage of the most convenient energy source available. In this usage, convenient may mean most abundant, easiest to harvest or simplest to handle. Convenient will also correspond to cheapest in many instances. However, some consider it a responsibility to think of the long term costs of the energy we use. No form of energy is free The matured laser-diagnostic techniques of planar laser-induced fluorescence (PLIF) and particle image velocimetry (PIV) were applied to a prototype gas turbine burner operating on various fuels. The work was performed to provide verification of computational fluid dynamic (CFD) models of the combustion of atypical fuels in a gas turbine combustor. The burner was operated using methane and three s

The cholesterol-lowering effects of oats have led to an increasing interest in them on the food market. Liquid oats has emerged as a new way of consuming oats and has become a commercial product. To produce liquid oats, steam-heated dehulled oat groats are subjected to flaking, wet-milling, enzyme hydrolysis, decanting, formulation, and ultra-high-temperature (UHT) treatment, the resulting beverag

Parameter estimation in general state space models is not trivial as the likelihood is unknown. We propose a recursive estimator for general state space models, and show that the estimates converge to the true parameters with probability one. The estimates are also asymptotically Cramer-Rao efficient. The proposed estimator is easy to implement as it only relies on non-linear filtering. This makes

It is argued in this paper that the nature of innovation networks can vary substantially with regard to the type of knowledge that is critical for innovation. Subject to the knowledge base of an industry, networks between companies can differ in various aspects, such as their geographical configuration, their structure, the type of actors holding a strategic position and the type of relations betw