| 1. |
- Bergman, Susanna L., et al.
(författare)
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In-situ studies of oxidation/reduction of copper in Cu-CHA SCR catalysts: Comparison of fresh and SO2-poisoned catalysts
- 2020
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Ingår i: Applied Catalysis B: Environmental. - : Elsevier BV. - 0926-3373 .- 1873-3883. ; 269
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Tidskriftsartikel (refereegranskat)abstract
- SO2-poisoning results in deactivation of Cu-CHA SCR under standard SCR conditions; however regeneration at 700 °C completely restores the SCR performance. To understand the nature of these effects, Cu-species in the fresh and poisoned catalysts were characterized by in-situ temperature-dependent time-resolved Cu K-edge X-ray absorption spectroscopy using the multivariate curve resolution alternating least squares (MCR-ALS) approach and continuous Cauchy wavelet transforms. The extracted chemically-meaningful reference spectra of Cu-species were analyzed by DFT-assisted XANES calculations. Cu-bisulfates were found as the most energetically favorable poisoned Cu-species. The response of Cu-species to a reducing environment differs in the fresh and SO2-poisoned catalysts. Differences in reducibility are related to the formation of quasi-linear Cu-complexes in the SO2-poisoned catalyst formed during heating in H2/He. Heating in H2/He leads to partial desulfurization of the poisoned catalyst. Cooling in H2/He after heating results in more facile formation of Cu-metal clusters in fresh catalyst than in SO2-poisoned.
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| 2. |
- Bosse, Jocelyn, et al.
(författare)
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Spectres of Intellectual Property in the Soviet Union: The Development and Recognition of the Inventor’s Certificate
- 2023
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Ingår i: Pólemos. - 2035-5262 .- 2036-4601. ; 17:2, s. 293-316
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Tidskriftsartikel (refereegranskat)abstract
- After the October Revolution in 1917, the legal protection for inventions in the Soviet Union underwent a series of transformations. One of the key changes was the emergence of the "inventor's certificate" as a socialist alternative to patents, whereby inventions were declared to be state property, but inventors were entitled to recognition and compensation. Patents were generally available in parallel to inventor's certificates, but the latter remained the preferred mechanism for encouraging the worker-inventor and mass inventing activity, as well as promoting the free flow of information that capitalist patent systems had failed to achieve. However, as the Soviet Union started to pursue membership of the Paris Convention for the Protection of Industrial Property, several socialist countries sought to amend the treaty to recognise their inventor's certificates as equivalent to patents. This sparked a debate amongst Paris Union members, during which the socialist countries portrayed the inventor's certificate in a manner analogous to Schrödinger's cat: it simultaneously was and wasn't a patent. While the debate was never fully resolved by the Paris Union members, this article revisits the history and international debates about the Soviet protection of inventions to consider what the uncertainty about the inventor's certificate might reveal about the circulation of technical information and the nature of global intellectual property law.
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| 3. |
- Dahlin, Johanna, 1979-
(författare)
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Hur stor är en gruva? : Överlappandeproblemområden i en handläggningsprocess
- 2021
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Ingår i: Nordisk Administrativt Tidsskrift. - : Djoef Forlag. - 2246-1310. ; 98:1
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Tidskriftsartikel (refereegranskat)abstract
- Planerna på en järnmalmsgruva i Kallak utanför Jokkmokk i Norrbottens län har mött stortmotstånd, men har också ivriga förespråkare. Denna artikel analyserar de kontroversiellaplanerna genom att studera handläggningen av ansökan om bearbetningskoncession.Ärendet har handlagts i flera omgångar och två gånger hänskjutits till regeringen för beslut. Iskrivande stund, åtta år efter att ansökan gjordes, saknas ännu beslut i ärendet. Genom endiskussion av fallet Kallak vill jag belysa hur djupt politiska grundantaganden kommer in iförvaltningsprocessen och påverkar hur olika instanser agerar i ärendet. Artikeln bygger påen analys av material som har producerats och inkommit i processen i form av skrivelser ochyttranden. Handläggningsprocessen visar att frågan om att bevilja en bearbetningskoncessionär svåravgränsad och knuten till ett antal andra överlappande problemområden.Med den här artikeln vill jag bidra med förståelse för hur handläggningen i det här fallet intealls är konsensusdriven, teknisk fråga, utan hur konflikter mellan olika preferenser, värdenoch världsbilder kommer till uttryck i beslutsprocessen.
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| 4. |
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| 5. |
- Dahlin, Johanna, et al.
(författare)
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Revitalizing Traditional Agricultural Practices: Conscious Efforts to Create a More Satisfying Culture
- 2021
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Ingår i: Sustainability. - : MDPI. - 2071-1050. ; 13:20
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Tidskriftsartikel (refereegranskat)abstract
- This paper investigates how non-industrial agrarian traditions and practices are reworked and recontextualized in a contemporary context. Explorative in its nature, the paper uses in depth interviews with practitioners in eastern Sweden, several of whom are engaged in work to keep practices of the past alive, to discuss how the concept of revitalization can bear on sustainability. Traditional practices are revived as an alternative to industrialized agriculture, and as having a bearing on resilient cultivation systems as well as social relations. They are seen as means of increasing food security and reversing the negative biodiversity development caused by increased monoculture. We understand tradition as a process of negotiation and adaptation to the present, where revivals to some extent necessarily change the traditions that they attempt to revive. Tradition is thus a dynamic concept, always made in the present, never fixed but constantly evolving. In the challenges created by climate change and environmental degradation, it is increasingly voiced that true sustainability requires a transformation of the cultural system. In many cases, people are turning to tradition for sustainable alternatives to industrialized ways of life and to protect a diversity threatened by a dominant and unsustainable lifestyle.
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| 6. |
- Dahlin, Johanna, 1979-
(författare)
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The Continental Archipelago of Norilsk
- 2021
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Ingår i: Karib - Nordic Journal for Caribbean Studies. - Stockholm : Stockholm University Press. - 1894-8421 .- 2387-6743. ; 6:1, s. 1-10
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Tidskriftsartikel (refereegranskat)abstract
- Russian author Alexander Solzhenitsyn made famous the image of the Soviet prison system Gulag as an archipelago. In this paper, Solzhenitsyn’s idea of the Gulag archipelago is juxtaposed with French Caribbean writer and philosopher Édouard Glissant’s notion of archipelagic thinking. The focus is on the mining city Norilsk in Northern Siberia, one of the “islands” in this penal geography, a city that was largely built using forced labour. It is a long way from the Caribbean to Siberia, but both archipelagos (real and conceptual) share a history that can be termed colonial. While the system that created this penal archipelago of the Gulag was, in Glissant’s terms, a manifestation of thoroughly continental thinking, complete with grand, universalizing tendencies, it may also be possible to sense the diversity and interconnectedness that he attributed to the archipelago. The case of Norilsk is examined through the 2017 documentary A Moon of Nickel and Ice by Canadian film-maker Françoise Jacob. Glissant’s ideas are used to open up and pose questions, rather than to provide definitive answers.
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| 7. |
- Dahlin, Sandra, et al.
(författare)
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Effect of biofuel- and lube oil-originated sulfur and phosphorus on the performance of Cu-SSZ-13 and V2O5-WO3/TiO2 SCR catalysts
- 2021
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Ingår i: Catalysis Today. - : Elsevier B.V.. - 0920-5861 .- 1873-4308. ; 360, s. 326-339
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Tidskriftsartikel (refereegranskat)abstract
- Two different SCR catalysts, V2O5-WO3/TiO2 and Cu-SSZ-13, were exposed to biodiesel exhausts generated by a diesel burner. The effect of phosphorus and sulfur on the SCR performance of these catalysts was investigated by doping the fuel with P-, S-, or P + S-containing compounds. Elemental analyses showed that both catalysts captured phosphorus while only Cu-SSZ-13 captured sulfur. High molar P/V ratios, up to almost 3, were observed for V2O5-WO3/TiO2, while the highest P/Cu ratios observed were slightly above 1 for the Cu-SSZ-13 catalyst. Although the V2O5-WO3/TiO2 catalyst captured more P than did the Cu-SSZ-13 catalyst, a higher degree of deactivation was observed for the latter, especially at low temperatures. For both catalysts, phosphorus exposure resulted in suppression of the SCR performance over the entire temperature range. Sulfur exposure, on the other hand, resulted in deactivation of the Cu-SSZ-13 catalyst mainly at temperatures below 300-350 °C. The use of an oxidation catalyst upstream of the SCR catalyst during the exhaust-exposure protects the SCR catalyst from phosphorus poisoning by capturing phosphorus. The results in this work will improve the understanding of chemical deactivation of SCR catalysts and aid in developing durable aftertreatment systems.
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| 8. |
- Englund, Johanna, 1988, et al.
(författare)
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Deactivation of a Vanadium-Based SCR Catalyst Used in a Biogas-Powered Euro VI Heavy-Duty Engine Installation
- 2020
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Ingår i: Catalysts. - : MDPI AG. - 2073-4344. ; 10:5
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Tidskriftsartikel (refereegranskat)abstract
- We have investigated how the exhaust gases from a heavy-duty Euro VI engine, powered with biogas impact a vanadium-based selective catalytic reduction (SCR) catalyst in terms of performance. A full Euro VI emission control system was used and the accumulation of catalyst poisons from the combustion was investigated for the up-stream particulate filter as well as the SCR catalyst. The NO(x)reduction performance in terms of standard, fast and NO2-rich SCR was evaluated before and after exposure to exhaust from a biogas-powered engine for 900 h. The SCR catalyst retains a significant part of its activity towards NO(x)reduction after exposure to biogas exhaust, likely due to capture of catalyst poisons on the up-stream components where the deactivation of the oxidation catalyst is especially profound. At lower temperatures some deactivation of the first part of the SCR catalyst was observed which could be explained by a considerably higher surface V4+/V(5+)ratio for this sample compared to the other samples. The higher value indicates that the reoxidation of V(4+)to V(5+)is partially hindered, blocking the redox cycle for parts of the active sites.
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