Sökresultat

The paper is concerned with estimation of heat and power consumption in a conceptual plant to produce hydrogen from sucrose-containing or starchy biomass by fermentation. A hydrogen plant connected with a sugar factory is regarded as the basic option; the sugar factory serves as a source of sucrose-containing thick juice for the hydrogen plant, where this feedstock is processed to hydrogen. As ano

Temperature measurements in trunks and branches in a mature ca. 100 years-old mixed pine and spruce forest in central Sweden were used to estimate the heat storage in the tree biomass. The estimated heat flux in the sample trees and data on biomass distributions were used to scale up to stand level biomass heat fluxes. The rate of change of sensible and latent heat storage in the air layer below t

Det finns lösningar för att göra samhället oberoende av fossil energi. Men för att kunna tillämpa dem behövs tvärvetenskaplig forskning och samverkan inom områden som hållbara bränslen och termisk energi, systemstudier, samt elektrifiering och energilagring – där profilområdet har spetskunskap.

Hydrogen migration is a ubiquitous phenomenon upon dissociation of organic molecules. Here we investigate the formation of a H3O+ fragment after core-level photoionization and Auger decay in aminobenzoic acid molecules - a process that requires the migration of at least two hydrogen atoms. Using photoelectron-photoion coincidence spectroscopy, the formation of a H3O+ fragment is observed to be mor

A reactive hydride composite (RHC) with initial composition 3CaH(2) + 4MgB(2) + CaF2 was studied by in situ synchrotron radiation powder X-ray diffraction (SR-PXD) and X-ray absorption near edge structure (XANES) at the B K-edge and at the Ca K-edge. The hydrogenation reaction proceeds by an unknown intermediate. No evidence of intermediates was observed during the dehydrogenation reaction. B and

Kompetenscentret AdTherM inriktar sig på analyser av termiska processer i industriella tillämpningar, inklusive termo- och elektrokemisk energiomvandling. De flesta utmaningar för industrin inom detta område är generiska och baseras på samma fysiska mekanismer. För att utveckla detta forskningsfält måste både experiment och modeller förbättras och samordnas. AdTherM är en plattform som är centreraAdTherM targets analyses of thermal processes in industrial applications, including thermo- and electrochemical energy conversion activities. Most challenges for the industry in this area are generic and based on the same physical mechanisms. To develop this field, both experiments and models need to be improved and coordinated. AdTherM is a platform centered around the models and methods used t

We report on a hybrid bioelectrochemical system that integrates an energy converting part, viz. a glucose/oxygen enzymatic fuel cell, with a charge-storing component, in which the redox features of the immobilized redox protein cytochrome c (cyt c) were utilized. Bilirubin oxidase and pyrroloquinoline quinone-dependent glucose dehydrogenase

The flow field design of current collectors is a significant issue, which greatly affects the mass transport processes of reactants/products inside fuel cells. Especially for proton exchange membrane (PEM) fuel cells, an appropriate flow field design is very important due to the water balance problem. In this paper, a wavy surface is employed at the cathode flow channel to improve the oxygen mass

Vi studerar järnvägen ur ett antal olika perspektiv, med fokus på att höja dess kapacitet och punktlighet. Gruppens utgångspunkt är att klimatförändringar vår generations stora utmaning, och transportsektorn står för ungefär en tredjedel av utsläppen. Järnvägen är ett grönt och kapacitetsstarkt transportmedel som har stor potential att bidra positivt i omställningen till ett fossilfritt och energiWe study the railway from several different perspectives, with a focus on increasing its capacity and punctuality. The group's starting point is that climate change is our generation's major challenge, and the transport sector accounts for approximately one third of emissions. The railway is a green and high-capacity means of transport that has great potential to make a positive contribution to th

Hydrogen-fuelled technologies for home heating and cooking may provide a low-carbon solution for decarbonising parts of the global housing stock. For the transition to transpire, the attitudes and perceptions of consumers must be factored into policy making efforts. However, empirical studies are yet to explore potential levels of consumer heterogeneity regarding domestic hydrogen acceptance. In r