Tind Technologies (Norway)
Hes-so: ArODES Open Archive (University of Applied Sciences and Arts Western Switzerland / Haute école spécialisée de Suisse occidentale / FH Westschweiz)Not a member yet
15764 research outputs found
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Life cycle assessment and techno-economic comparison of methane production routes from sewage sludge ::incineration vs. hydrothermal gasification and anaerobic digestion
No full textThe disposal of sewage sludge poses significant challenges due to storage difficulties and the presence of pollutants and pathogens. Conventional treatment methods, such as incineration and anaerobic digestion (AD), are compared to advanced technologies like hydrothermal gasification (HTG) with syngas upgrading for methane production. Various indicators — i.e. environmental impacts, exergy efficiency, capital expenditures, and operational expenses — are assessed to evaluate these pathways. The scope of the life cycle assessment (LCA) accounts for the waste recovery, the treatement infrastructure, and material and energy flows. It additionally account for the substitution of valorized products. For instance, the methane produced is assumed to replace fossil methane with a substitution rate ranging from 100% (entire replacement of fossil methane) to 0%, considering either no substitution or future decarbonized energy systems. As a result, HTG achieves an exergy efficiency as low as 10.2 %. Yet, carbon management strategies, such as co-electrolysis (co-SOEC), can improve the exergy efficiency up to a value of 62.2 %. The most favourable routes in terms of GHG emissions are those mineralizing CO2 from sludge gasification (−1,100 kg CO2-eq/FU) or maximizing sludge-to-methane conversion (e.g., HTG with co-SOEC, −790 kg CO2-eq/FU). However, this benefit reverses under a 0 % substitution scenario (+770 kg CO2-eq/FU). In contrast, AD-based routes with lower energy demand show impacts between − 328 and + 70 kg CO2-eq/FU, also being more competitive in terms of costs. Beyond GHG emissions, trade-offs emerge across other impact categories, notably water scarcity, ecosystem quality, and fossil and nuclear energy use, particularly for routes involving CO2 mineralization and co-SOEC due to their high energy demand
Marche sensible ::que reste-t-il du tiers paysage de l’ancienne friche de Malley ?
No full textMarche sensible dans le cadre du séminaire doctoral Artsearch/Sacre, Lausanne, le 22 mai 2024. La marche est menée par Maria Da Silva et Nicolas Dutour avec les participants et participantes du séminaire doctoral (étudiant.es, enseignant.es, cherchereuses)
Des habitats et des environnements de vie adaptés aux personnes âgées
No full textLe vieillissement démographique transforme la structure de la population suisse :
les personnes de 65 ans et plus constituent un groupe croissant et hétérogène, avec
des attentes, des capacités et des ressources diverses. En ville, leur qualité de vie
dépend d’un ensemble de facteurs spatiaux, sociaux et économiques qui nécessitent
une attention particulière de la part des politiques publiques
The potential contribution of flood management ponds to pondscape biodiversity ::evidence from dragonflies
No full text1. After decades of river channelisation, restoration projects are flourishing, many with the aim of reducing flood risk by re-connecting rivers to their floodplains and making space for water. Pond creation is often included to enable temporary storage of surface water as a natural flood management (NFM) measure in catchment-scale restoration programmes.
2. However, evidence on the potential benefits of these newly created NFM ponds for biodiversity is still scarce, including for flagship wetland groups such as dragonflies (Odonata). To examine this, inventories of adult Odonata were undertaken in the Eddleston Water catchment (Scottish Borders). Twenty ponds were surveyed: ten newly created NFM ponds and 10 pre-existing ponds (used as reference sites).
3. Pond creation for NFM has strengthened the regional Odonata populations and increased habitat availability, with all recorded species of dragonflies now found at more sites. NFM ponds display slightly higher Odonata alpha species richness than reference ponds. Community composition of NFM ponds was similar to that of reference ponds, as were their environmental conditions. Richness in Odonata was positively correlated with macrophyte richness and the percentage of pond shoreline covered in emergent vegetation, along with pond density.
4. Practical implication. Our investigation shows that ponds created primarily as NFM measures can host Odonata communities as diverse as established ponds, provided they are well located, well designed, and managed in ways that allow the development of aquatic vegetation in the pond and on its shoreline. As such, the flood management ponds of the Eddleston Water catchment are a good example of effective nature-based solution implementation, tackling the twin crises of climate change and biodiversity loss
Why ponds concentrate nutrients ::the roles of internal features, land use, and climate
No full textPonds are key freshwater habitats supporting biodiversity and ecosystem services, yet they remain understudied in the context of land use and climate change. We examined 240 ponds across eight countries (seven in Europe and Uruguay) to assess how internal pond characteristics, surrounding land cover and livestock intensity, seasonal climatic variation, and climate influence nutrient concentrations across spatial and temporal scales. Nutrient concentrations were strongly associated with internal features: shallow ponds and short hydroperiods had higher total nitrogen (TN) and total phosphorus (TP) concentrations, while thermal stratification, typically found in deeper ponds, was associated with higher TN, indicating enhanced internal nutrient recycling. Land use also played a significant role with agricultural intensity increasing nutrient concentration (both TN and TP), whereas forest cover reduced TP. Seasonal variation modulated these patterns, with higher TP concentrations observed in summer, and with dilution effects during wetter and cooler periods, particularly for TN in semi-permanent ponds. These findings underscore the combined influence of physical characteristics, landscape context, and climate variability on nutrient concentrations in ponds and highlight the need for integrated, multi-scale approaches to anticipate the impacts of global climate change effects on these ecologically valuable ecosystems
Failure tolerant operation and trimming principle in the CLIC main linac
No full textA powering strategy for a high number of magnets disposed in a radiated and confined area is presented for a particle accelerator application. One power converter supplies the main current in series connected magnets. Then, for adjusting each current individually, small active trimmers are implemented together which each magnet. The trimmers are only dissipative, implemented as MOSFETs operated in their linear region and controlled by analog PI controllers. The reliability of the whole powering system is ensured with failure tolerance that complies with beam physics. The steady state operation and dynamic response in case of failures are experimentally studied in a reduced scale prototype
Anwendung des kalten Ganzkörperwickels bei erwachsenen stationär-psychiatrisch behandelten Patienten ::Design und erste Ergebnisse einer Pilotstudie
No full text(Im)mobility Salon #1 ::Institute of Rest(s) meets Tanzfabrik
No full text(Im)mobility Salon #1 : Institute of Rest(s) meets Tanzfabrik s’est déroulà du 12 mars au 15 mars 2024 à la Tanzfabrik de Berlin. Il s’agit d’espaces d’études collectives ouvert au public. Chaque « salon » dure 3 heures. Ils sont organisés avec des invités : Paula Caspão, Emma Bigé, Ujjwal Kanishka Utkarsh, Yves Mettler et Clémentine Burnley
Institute of Rest(s) – (Im)mobility Salon #4
No full text(Im)mobility Salon #4 s’est tenu le 7 décembre 2024 à l’invitation de Xing à Bologne. Aliy Eynaudi était accompagnée de Paul Kotal, Anne Faucheret, Zoe Francia Lamattina & Ida Malfatti, Cécile Tonizzo, Daniela Crocettia Volkskundemuseum de Vienne en Autriche. Il s’agit tout d’abord d’un moment de rencontre entre des éditeurs indépendants, des poètes, des journalistes, des rédacteurs et des artistes dont le travail explore les pratiques de dissidence et de refus. C’est un temps d’étude collective
Modelling of Le Bois de la Glaive 2021's landslide, Switzerland
No full textThis study investigates the causes of the 2021 landslide in Ollon, Switzerland, an area known for ground instability due to its lithological composition, primarily weathered gypsum and anhydrite. The research integrates historical analysis, geotechnical investigations, and modelling to uncover the mechanisms behind these landslides. The landslide involved silty sand soil and gypsum blocks, driven by an intricate combination of geological and environmental factors. Field investigations and laboratory tests provided essential data for accurate modelling. Geoslope software was used to develop multiple models to assess the key factors triggering the landslide. The study examined various levels of saturation and different thicknesses of the altered gypsum layer. The results identified the primary triggers for the landslide as the saturation and thickness of the altered gypsum layer. A comparison of the boundary conditions derived from the modelling with the recent landslide event in December 2023 has validated the results of the study