An in situ XAS study of the cobalt rhenium catalyst for ammonia synthesis

A cobalt rhenium catalyst active for ammonia synthesis at 400 °C and ambient pressure was studied using in situ XAS to elucidate the reducibility and local environment of the two metals during reaction conditions. The ammonia reactivity is greatly affected by the gas mixture used in the pre-treatment step. Following H2/Ar pre-treatment, a subsequent 20 min induction period is also observed before ammonia production occurs whereas ammonia production commences immediately following comparable H2/N2 pre-treatment. In situ XAS at the Co K-edge and Re LIII-edge show that cobalt initiates reduction, undergoing reduction between 225 and 300 °C, whereas reduction of rhenium starts at 300 °C. The reduction of rhenium is near complete below 400 °C, as also confirmed by H2-TPR measurements. A synergistic co-metal effect is observed for the cobalt rhenium system, as complete reduction of both cobalt and rhenium independently requires higher temperatures. The phases present in the cobalt rhenium catalyst during ammonia production following both pre-treatments are largely bimetallic Co–Re phases, and also monometallic Co and Re phases. The presence of nitrogen during the reduction step strongly promotes mixing of the two metals, and the bimetallic Co–Re phase is believed to be a pre-requisite for activity

The Hyperlinked Scandinavian News Ecology. The unequal terms forged by the structural properties of digitalisation

The article presents a network analysis of 22,861,013 geocoded external hyperlinks, collected from 230 Danish, 220 Norwegian and 208 Swedish news websites in 2016. The analysis asks what the structural properties of the Scandinavian media systems—including its geography and ownership structures—mean for news outlets’ centrality within the hyperlinked news ecology. The analysis finds that whereas incumbent legacy media occupy central positions, about one third of the network is absent from the hyperlinked interaction, primarily local, independently owned newspapers. A multiple linear regression analysis shows that national distribution and corporate ownership correlates to network centrality more than other predictors. As brokers in the network consist of the large, legacy, capital-based news organisations, hyperlink connectivity is primarily characterised by proximity to the centres of power, corporate ownership, agenda setting incumbency and national distribution. </p

Dynamical models for sand ripples beneath surface waves

We introduce order parameter models for describing the dynamics of sand ripple patterns under oscillatory flow. A crucial ingredient of these models is the mass transport between adjacent ripples, which we obtain from detailed numerical simulations for a range of ripple sizes. Using this mass transport function, our models predict the existence of a stable band of wavenumbers limited by secondary instabilities. Small ripples coarsen in our models and this process leads to a sharply selected final wavenumber, in agreement with experimental observations.Comment: 9 pages. Shortened version of previous submissio

Indigenous Spirituality in the Touristic Borderzone: Virtual Performances of Sámi Shamanism in Sápmi Park

For tourists travelling to the northernmost parts of Europe, the tour includes not only experiences of wild nature, Midnight Sun, and Aurora Borealis, but also encounters with the indigenous Sámi people who populate the area. Emblematically represented in tourist guidebooks as reindeer herders, the Sámi stand out as representatives of a life lived in close contact with nature, and as carriers of an indigenous spirituality that reflects a deep concern for the environment and for the powers found in nature. How can this insight be represented or performed in tourism? The article discusses the representation of this image of the Sámi in a theme park in the village of Kárášjohka, Norway. Transposed to the stage of the experience industry in the Sápmi Magic Theatre, a virtual Sámi shaman narrates to tourists the story of an ancient indigenous wise man. This narrative is on the one hand deeply embedded in Western imaginaries about the Noble Savage and about a prelapsarian, pre-colonial past. On the other hand, this myth is represented as something belonging to a more glorious past, and not as part of present-day indigenous life. From the point of view of ethno-politics, such narratives may support Sámi claims of representing a unique culture, while at the same time constituting a threat to the fight for an equal position in contemporary society

Getting shot of elves: healing, witchcraft and fairies in the Scottish witchcraft trials

This paper re-examines the evidence of the Scottish witchcraft trials for beliefs associated by scholars with "elf-shot." Some supposed evidence for elf-shot is dismissed, but other material illuminates the interplay between illness, healing and fairy-lore in early modern Scotland, and the relationship of these beliefs to witchcraft itself

A comparison of Optisoap versus commercial soap in preventing protein deposition on hydrophilic contact lenses

This study compared the effectiveness of Optisoap versus other commericial hand soaps in preventing protein deposition of hydrophilic contact lenses due to soap residues. Twelve clean lenses were halved, treated with Optisoap or a commercial soap, and placed in a protein solution. The lenses were inspected for protein deposits after thirty and sixty minutes. No significant difference was found between the Optisoap or the commercial soaps

Acute Lower Respiratory Infection in Childhood and Household Fuel Use in Bhaktapur, Nepal

Background: Globally, solid fuels are used by about 3 billion people for cooking. These fuels have been associated with many health effects, including acute lower respiratory infection (ALRI) in young children. Nepal has a high prevalence of use of biomass for cooking and heating. Objective: This case–control study was conducted among a population in the Bhaktapur municipality, Nepal, to investigate the relationship of cookfuel type to ALRI in young children. Methods: Cases with ALRI and age-matched controls were enrolled from an open cohort of children 2–35 months old, under active monthly surveillance for ALRI. A questionnaire was used to obtain information on family characteristics, including household cooking and heating appliances and fuels. The main analysis was carried out using conditional logistic regression. Population-attributable fractions (PAF) for stove types were calculated. Results: A total of 917 children (452 cases and 465 controls) were recruited into the study. Relative to use of electricity for cooking, ALRI was increased in association with any use of biomass stoves [odds ratio (OR) = 1.93; 95% CI: 1.24, 2.98], kerosene stoves (OR = 1.87; 95% CI: 1.24, 2.83), and gas stoves (OR = 1.62; 95% CI: 1.05, 2.50). Use of wood, kerosene, or coal heating was also associated with ALRI (OR = 1.45; 95% CI: 0.97, 2.14), compared with no heating or electricity or gas heating. PAFs for ALRI were 18.0% (95% CI: 8.1, 26.9%) and 18.7% (95% CI: 8.4%–27.8%), for biomass and kerosene stoves, respectively. Conclusions: The study supports previous reports indicating that use of biomass as a household fuel is a risk factor for ALRI, and provides new evidence that use of kerosene for cooking may also be a risk factor for ALRI in young children

Fortellinger til kommisjonen

In the Norwegian truth and reconciliation commission («Kommisjonen for å granske fornorskingspolitikk og urett overfor samer, kvener og norskfinner, og skogfinner»), appointed 2018, much emphasis is on giving those affected by the so-called ‘politics of Norwegianization’ an opportunity to tell their narratives about the consequences of this policy (usually said to have taken place during the duration of 1850–1950). In the mandate, formulated by the Norwegian Parliament, the commission is urged to provide opportunities for those affected to share their personal experiences and narratives of the Norwegianization policy. The narratives are collected and documented through interviews and open meetings. Partly based on the work of other similar truth commissions, this article will examine how such collected narratives have been interpreted. From a folkloristic point of view, what kind of narratives can they be categorized as, and what happens when the context for dissemination changes from the private space to a public investigation? Can folkloristic research in any way support the understanding and appreciation of these narratives