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The catalyst layer (CL) in polymer electrolyte membrane (PEM) fuel cells is one of the key components regulating the overall performance of the cell. In PEM fuel cells, there are two CLs having identical composition for hydrogen oxidation (HO) and oxygen reduction (OR) reactions. There are four phases inside the CL, namely: carbon, Pt particles, ionomer and voids. In this work, a micro-model of th
The effect of burning piles of slash on a Norway spruce clear-cut in southern Sweden was followed for 3 years. The vegetation cover, soil chemistry, soil water at a depth of 30 - 40 cm and runoff water were studied. The burnt plots were without vegetation for several months after burning, while the control plots were almost totally covered by Deschampsia flexuosa and Galium saxatile. The remaining
Populärvetenskaplig sammanfattning: Förekomsten av finkorniga granitgångar är ett potentiellt problem vid lagring av kärnbränsle i berggrunden eftersom de utgör svaghetszoner. Det är därför viktigt att ta reda på hur dessa gångar beter sig i berggrunden. Huvudsyftet med detta examensarbete är att undersöka om de finkorniga granitgångarna är kontrollerade av några strukturer i tunneln vid ÄspölaborThe occurrence of fine-grained granite (FGG) dykes is one of the potential problems in the storage of nuclear waste in the bedrock. It is therefore important to locate and characterise such dykes. The major object in this thesis is to investigate, whether the FGG dykes at the Äspö Hard Rock Laboratory (ÄHRL) are structurally controlled. This involves measuring the orientations of the dykes, to cor
The water use associated with electricity generation and consumption has been the focus of research for decades. This study provides an overview of the water–electricity nexus from the perspectives of electricity production and consumption. In terms of production, the electricity generation and associated water use for various regions are summarized and compared. The spatial mismatch between water
Tar is an undesirable byproduct of biomass gasification, which can be removed through catalytic reforming to syngas components. Iron is a promising, abundant alternative to highly active but toxic nickel catalysts. The results observed so far in catalytic studies with iron have been mixed. In this paper, the decomposition of naphthalene, a representative model compound of tar, was studied on the c
The Scania-HBV model has been used for modeling hydropower generation of California, USA. California is a state with considerable meteorological and hydrological diversity, meanwhile with a total capacity of 14116 MW of 386 hydroelectricity generation units with capacity larger than 0.1 MW, California is the USA’s second largest state on hydropower. For such a giant hydropower state, prediction of
Households base their choices of heating systems on subjectively dependent conceptions of heating sources, rather than on an understanding of a complex reality. Similar to other agents in society, households need to construct simplified frames to be able to make their choices possible to manage. Using in-depth interviews with households in Småland (in Sweden) with a few comparisons from Massachuse
Popular Abstract in Swedish Personer som arbetar med joniserande strålning inom t.ex. sjukvård, kärnteknik och forskning använder så kallade dosimetrar för att registrera hur mycket joniserande strålning (vilken stråldos) personen blivit utsatt för under ett arbetspass eller en arbetsmånad. Den stråldos som en dosimeter mäter ger ett mått på risken för eventuella sena hälsoeffekter i form av en ökIn the event of a radiation accident, it is crucial to make rapid estimates of the absorbed dose received by both emergency workers, so-called first responders, and members of the public. Today, only personnel in rescue teams responding to nuclear emergencies have access to individual dosemeters. To make accurate assessments of the radiological consequences of an emergency situation, methods of re
This paper experimentally investigates heat dissipation of a heat pipe with phase change materials (PCMs) cooling in a multiple heat source system. Two heat sources are fixed at one end of the heat pipe. Considering that a heat sink cannot dissipate all the heat generated by two heat sources, various PCMs are used due to a large latent heat. Different materials in a container are wrapped outside o
Charge separation dynamics after the absorption of a photon is a fundamental process relevant both for photosynthetic reaction centers and artificial solar conversion devices. It has been proposed that quantum coherence plays a role in the formation of charge carriers in organic photovoltaics, but experimental proofs have been lacking. Here we report experimental evidence of coherence in the charg
This paper reviews path-creation processes in road transport systems in the Nordic countries: e-mobility in Denmark, hydrogen and fuel-cell electrical vehicles in Norway, and advanced biofuels in Finland and Sweden. The study builds on the path creation literature, which seeks to explain the emergence of new technological pathways. Drawing on recent insights concerning the differences between desi
The intensities of hydrogen Lyman-α and Balmer series emission lines as a result of photoexcitation of free CH4 and NH3 molecules at the C 1s and N 1s edges have been measured. For methane, the total fluorescence yield in the visible region (300–650 nm) was also recorded. Excitation functions of the Balmer lines show relative intensity enhancement of Balmer-β emission in comparison with Balmer-α a
Air pollution in the form of airborne particles – aerosols – is today an important aspect of many of our major societal challenges, such as sustainable cities, healthy indoor and working environments, clean energy production and reduced climate impact. As researchers in this field, we carry out both laboratory and field studies using measurement techniques ranging from small simple sensors to adva
https://www.eat.lth.se/en/research/airborne-particles-and-health - 2026-06-29
We provide a variety of solutions for tomography and imaging of samples of different sizes and in different environments. Our two tomographs offer the possibility to rapidly image larger samples, or perform a more in-depth high resolution scan of smaller objects. The 4D Imaging lab at Lund University is specialised in 3D and 4D imaging of a wide variety of samples. The facilities are located at th
https://www.4dimaginglab.lu.se/lund-university-4d-imaging-lab/our-lab-facilities - 2026-06-29
We describe the detectors for identification of charged particles and fragments in CHICSi, a large solid angle multitelescope system mounted inside an ultra-high vacuum (UHV), cluster-jet target chamber. CHICSi performs nuclear reaction experiments at storage rings. The telescopes consist of a first very thin, 10-14 mum Si detector, a second 300 mum (or possibly 500 pm) ion implanted Si detector s
Senior lecturer Welcome to my personal webpage. Below you can find some useful links and other information. Contact details Email: johan [dot] rathsman [at] fysik [dot] lu [dot] se Phone: +46 46 222 34 95Organisation Particle and nuclear physics Room number: K343 Service point: 14 WebpageJohan Rathsmans profile in Lund University research portalOther affiliations Assistant director of studies Unde
https://www.particle-nuclear.lu.se/johan-rathsman - 2026-06-29
