| 1. |
- Boström, Mathias, 1973-
(författare)
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Fonografen som föreställning : Introduktionen av ljudinspelningar vid svenska minnesinstitutioner
- 2024
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- With the invention of the phonograph in 1877 came the possibility to mechanically capture, store and reproduce sound. This thesis deals with how sound recording technology was introduced in memory institutions in Sweden. The focus of the thesis is on the first phonogram format, wax cylinder recordings, and their life cycle in use. This study deals only with memory institutions primarily directed towards Swedish-speaking majority culture, whereas cylinder recordings of the cultural Others will be the subject of a separate publication.The aim of the thesis is to increase the knowledge and enhance the understanding of the archival use of the cylinder phonograph in discourse and practice, with a focus on music recordings. With inspiration taken from a model of knowledge production by Bruno Latour, the study encompasses technology transfer, collecting practices and repertory analysis, institutionalization and professionalization, institutional economics, public presentations, and research practices. The cylinder phonograph was used by ten Swedish memory institutions 1898-1948, primarily by institutions directed towards traditional culture (dialects, folklore, and folk music), and with professional ambitions to some degree. Equipment and knowledge were to a certain extent transferred through professional networks in Sweden, with Danish and German memory institutions as important foreign competence centres. In comparison with some of the neighbouring countries, the introduction of sound recording technology in Sweden was generally some years later and the collections smaller. This is due to that professional memory institutions were founded later in Sweden, and that the collectors and scholars were primarily interested in typical representations of music in notation, rather than the phonogram’s particular representation of a single performance. Sound recording technology was therefore not regarded as a threat in relation to collecting music by ear. It was instead seen as a complement that could also, as objective reference recordings, increase the value of collections made by ear. The use of recording technology did, in several cases, narrow down the collected repertory and the informants that were chosen, due to that quality of performance now became important in a new sense. Few scholars in Sweden asked for archival recordings for research, and the cylinder recordings were not used for public presentations and publications in the period when the technology was in active use. Thus, it is not surprising that the cylinder phonograph did not became an important method for memory institutions in Sweden.
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| 2. |
- Cid Gomes, Leandro, et al.
(författare)
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Light-driven (cross-)dimerization of terpenes as a route to renewable C15-C30 crudes for fuel and lubricant oil applications
- 2023
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Ingår i: Sustainable Energy & Fuels. - : Royal Society of Chemistry. - 2398-4902. ; 7:3, s. 868-882
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Tidskriftsartikel (refereegranskat)abstract
- Non-fossil hydrocarbons are desirable for transport fuels and lubricant oils to reach a fossil carbon neutral economy. Herein, we show the production of such end-products from crude raw materials via the photosensitized dimerization of terpenes. Terpenes are hydrocarbons originating from renewable sources, such as forestry, industrial bio-waste and photosynthetically active microorganisms. Under irradiation at 365 nm, we observed high conversions of terpenes with conjugated diene segments into their dimers (e.g. 96.1 wt%, 12 h for α-phellandrene), and remarkable results were obtained using simulated and natural sunlight (90.8 wt% and 46.6 wt%, respectively, for α-phellandrene). We show that the lower reactivities of some isomeric monoterpenes could be overcome by a cross-photodimerization with α-phellandrene. We also utilized the cross-photodimerization approach to obtain C15 and C30 products, combining mixtures of isoprene, monoterpenes and sesquiterpenes. Hydrogenation of the terpene dimers gave materials with physical properties suitable as high energy density fuels and lubricant oils. Finally, our preliminary analysis based on recent literature points to the commercial viability of this route to produce fuels and lubricant oils, as well as to a potential for reduction of the environmental impact compared to fossil-based routes.
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| 3. |
- Cid Gomes, L., et al.
(författare)
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Light-driven (cross-)dimerization of terpenes as a route to renewable C15-C30 crudes for fuel and lubricant oil applications
- 2023
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Ingår i: Sustainable Energy & Fuels. - : Royal Society of Chemistry. - 2398-4902. ; 7:3, s. 868-882
-
Tidskriftsartikel (refereegranskat)abstract
- Non-fossil hydrocarbons are desirable for transport fuels and lubricant oils to reach a fossil carbon neutral economy. Herein, we show the production of such end-products from crude raw materials via the photosensitized dimerization of terpenes. Terpenes are hydrocarbons originating from renewable sources, such as forestry, industrial bio-waste and photosynthetically active microorganisms. Under irradiation at 365 nm, we observed high conversions of terpenes with conjugated diene segments into their dimers (e.g. 96.1 wt%, 12 h for α-phellandrene), and remarkable results were obtained using simulated and natural sunlight (90.8 wt% and 46.6 wt%, respectively, for α-phellandrene). We show that the lower reactivities of some isomeric monoterpenes could be overcome by a cross-photodimerization with α-phellandrene. We also utilized the cross-photodimerization approach to obtain C15 and C30 products, combining mixtures of isoprene, monoterpenes and sesquiterpenes. Hydrogenation of the terpene dimers gave materials with physical properties suitable as high energy density fuels and lubricant oils. Finally, our preliminary analysis based on recent literature points to the commercial viability of this route to produce fuels and lubricant oils, as well as to a potential for reduction of the environmental impact compared to fossil-based routes.
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| 4. |
- Höglund, Martin, et al.
(författare)
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Facile Processing of Transparent Wood Nanocomposites with Structural Color from Plasmonic Nanoparticles
- 2021
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Ingår i: Chemistry of Materials. - : AMER CHEMICAL SOC. - 0897-4756 .- 1520-5002. ; 33:10, s. 3736-3745
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Tidskriftsartikel (refereegranskat)abstract
- Wood is an eco-friendly and abundant substrate and a candidate for functionalization by large-scale nanotechnologies. Infiltration of nanoparticles into wood, however, is hampered by the hierarchically structured and interconnected fibers in wood. In this work, delignified wood is impregnated with gold and silver salts, which are reduced in situ to plasmonic nanoparticles via microwave-assisted synthesis. Transparent biocomposites are produced from nanoparticle-containing wood in the form of load-bearing materials with structural color. The coloration stems from nanoparticle surface plasmons, which require low size dispersity and particle separation. Delignified wood functions as a green reducing agent and a reinforcing scaffold to which the nanoparticles attach, predesigning their distribution on the surface of fibrous "tubes". The nanoscale structure is investigated using scanning transmission electron microscopy (STEM), energy-dispersive spectroscopy (EDS), and Raman microscopy to determine particle size, particle distribution, and structure-property relationships. Optical properties, including response to polarized light, are of particular interest.
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| 5. |
- Rana, Anup, et al.
(författare)
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A combined photobiological-photochemical route to C10 cycloalkane jet fuels from carbon dioxide via isoprene
- 2022
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Ingår i: Green Chemistry. - : Royal Society of Chemistry. - 1463-9262 .- 1463-9270. ; 24, s. 9602-
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Tidskriftsartikel (refereegranskat)abstract
- The hemiterpene isoprene is a volatile C5 hydrocarbon with industrial applications. It is generated today from fossil resources, but can also be made in biological processes. We have utilized engineered photosynthetic cyanobacteria for direct, light-driven production of bio-isoprene from carbon dioxide, and show that isoprene in a subsequent photochemical step, using either near-UV or simulated or natural solar light, can be dimerized into limonene, paradiprene, and isomeric C10H16 hydrocarbons (monoterpenes) in high yields under photosensitized conditions (above 90% after 44 hours with near-UV and 61% with simulated solar light). The optimal sensitizer in our experiments is di(naphth-1-yl)methanone which we use with a loading of 0.1 mol%. It can also easily be recycled for subsequent photodimerization cycles. The isoprene dimers generated are a mixture of [2 + 2], [4 + 2] and [4 + 4] cycloadducts, and after hydrogenation this mixture is nearly ideal as a drop-in jet fuel. Importantly the photodimerization can be carried out at ambient conditions. However, the high content of hydrogenated [2 + 2] dimers in our isoprene dimer mix lowers the flash point below the threshold (38 °C); yet, these dimers can be converted thermally into [4 + 2] and [4 + 4] dimers. When hydrogenated these monoterpenoids fully satisfy the criteria for drop-in jet fuels with regard to energy density, flashpoint, kinematic viscosity, density, and freezing point. Life-cycle assessment results show a potential to produce the fuel in an environmentally sustainable way.
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| 6. |
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| 7. |
- Samanta, Pratick, et al.
(författare)
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Coloration and Fire Retardancy of Transparent Wood Composites by Metal Ions
- 2023
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Ingår i: ACS Applied Materials and Interfaces. - : American Chemical Society (ACS). - 1944-8244 .- 1944-8252. ; 15:50, s. 58850-58860
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Tidskriftsartikel (refereegranskat)abstract
- Transparent wood composites (TWs) offer the possibility of unique coloration effects. A colored transparent wood composite (C-TW) with enhanced fire retardancy was impregnated by metal ion solutions, followed by methyl methacrylate (MMA) impregnation and polymerization. Bleached birch wood with a preserved hierarchical structure acted as a host for metal ions. Cobalt, nickel, copper, and iron metal salts were used. The location and distribution of metal ions in C-TW as well as the mechanical performance, optical properties, and fire retardancy were investigated. The C-TW coloration is tunable by controlling the metal ion species and concentration. The metal ions reduced heat release rates and limited the production of smoke during forced combustion tests. The potential for scaled-up production was verified by fabricating samples with a dimension of 180 x 100 x 1 (l x b x h) mm(3).
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