| 1. |
- Adolfsson, Erik, et al.
(författare)
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Effects of granule density on strength and granule related defects in zirconia
- 2012
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Ingår i: Journal of the European Ceramic Society. - : Elsevier BV. - 0955-2219 .- 1873-619X. ; 32:11, s. 2653-2659
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Tidskriftsartikel (refereegranskat)abstract
- A suspension of zirconia powder (TZ3YSE) with a solids loading of 50 vol% was prepared by ball milling. Binders were added and some of the suspension was diluted to 40, 30 and 20 vol% before freeze granulation was performed. A spray dried material (TZ3YSEB) was used as a reference. The pore size distribution of the different granules was evaluated and from the microstructure it was shown that inhomogeneities were present in both the freeze granulated as well as in the spray dried granules. In addition, the density, microstructure as well as the strength of sintered materials prepared from the granules were studied. The results showed that a high green density or sintered density was not sufficient in order to achieve a high strength material. It was further shown that the strength was significantly influenced by the granule density and not by the inhomogeneities found in the granules.
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| 2. |
- Ahrentorp, Fredrik, et al.
(författare)
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Sensitive magnetic biodetection using magnetic multi-core nanoparticles and RCA coils
- 2017
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Ingår i: Journal of Magnetism and Magnetic Materials. - : Elsevier BV. - 0304-8853 .- 1873-4766. ; 427, s. 14-18
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Tidskriftsartikel (refereegranskat)abstract
- We use functionalized iron oxide magnetic multi-core particles of 100 nm in size (hydrodynamic particle diameter) and AC susceptometry (ACS) methods to measure the binding reactions between the magnetic nanoparticles (MNPs) and bio-analyte products produced from DNA segments using the rolling circle amplification (RCA) method. We use sensitive induction detection techniques in order to measure the ACS response. The DNA is amplified via RCA to generate RCA coils with a specific size that is dependent on the amplification time. After about 75 min of amplification we obtain an average RCA coil diameter of about 1 mu m. We determine a theoretical limit of detection (LOD) in the range of 11 attomole (corresponding to an analyte concentration of 55 fM for a sample volume of 200 mu L) from the ACS dynamic response after the MNPs have bound to the RCA coils and the measured ACS readout noise. We also discuss further possible improvements of the LOD.
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| 3. |
- Alvarsson, Jesper J., et al.
(författare)
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Aircraft noise and speech intelligibility in an outdoor living space
- 2014
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Ingår i: Journal of the Acoustical Society of America. - : Acoustical Society of America (ASA). - 0001-4966 .- 1520-8524. ; 135:6, s. 3455-3462
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Tidskriftsartikel (refereegranskat)abstract
- Studies of effects on speech intelligibility from aircraft noise in outdoor places are currently lacking. To explore these effects, first-order ambisonic recordings of aircraft noise were reproduced outdoors in a pergola. The average background level was 47 dB L-Aeq. Lists of phonetically balanced words (L-ASmax,L- word = 54 dB) were reproduced simultaneously with aircraft passage noise (L-ASmax,L- noise = 72-84 dB). Twenty individually tested listeners wrote down each presented word while seated in the pergola. The main results were (i) aircraft noise negatively affects speech intelligibility at sound pressure levels that exceed those of the speech sound (signal-to-noise ratio, S/N < 0), and (ii) the simple A-weighted S/N ratio was nearly as good an indicator of speech intelligibility as were two more advanced models, the Speech Intelligibility Index and Glasberg and Moore's [J. Audio Eng. Soc. 53, 906-918 (2005)] partial loudness model. This suggests that any of these indicators is applicable for predicting effects of aircraft noise on speech intelligibility outdoors.
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| 4. |
- Andersson, Linnéa, et al.
(författare)
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Evaluating pore space in macroporous ceramics with water-based porosimetry
- 2013
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Ingår i: Journal of The American Ceramic Society. - : Wiley. - 0002-7820 .- 1551-2916. ; 96:6, s. 1916-1922
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Tidskriftsartikel (refereegranskat)abstract
- We show that water-based porosimetry (WBP), a facile, simple, and nondestructive porosimetry technique, accurately evaluates both the pore size distribution and throat size distribution of sacrificially templated macroporous alumina. The pore size distribution and throat size distribution derived from the WBP evaluation in uptake (imbibition) and release (drainage) mode, respectively, were corroborated by mercury porosimetry and X-ray micro-computed tomography (μ-CT). In contrast with mercury porosimetry, the WBP also provided information on the presence of “dead-end pores” in the macroporous alumina.
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| 5. |
- Andersson, Nina, et al.
(författare)
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One-Pot Synthesis of Well-Ordered Mesoporous Magnetic Carriers
- 2007
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Ingår i: Journal of Materials Chemistry. - : Royal Society of Chemistry (RSC). - 0959-9428 .- 1364-5501. ; 17:26, s. 2700-2705
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Tidskriftsartikel (refereegranskat)abstract
- The facile preparation of a mesoporous magnetic carrier technology is demonstrated. The micron-sized spherical mesostructured particles are prepared using a newly-developed, one-step, combined emulsion and solvent evaporation (ESE) method. The surfactant-templated silica matrix display a well-ordered internal pore architecture. Very limited pore blocking, and only to a limited degree disordered- or worm-like structures are observed, induced by the iron oxide nanoparticles added to provide the superparamagnetic properties.The iron oxide content was precisely controlled, and the magnetic properties were well preserved during the process. Finally we demonstrate the applicability of the magnetically separable mesoporous material as an adsorbent for specific dissolved materials from dilute aqueous solutions.
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| 6. |
- Argyropoulos, Dimitris D. S., et al.
(författare)
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Kraft Lignin: A Valuable, Sustainable Resource, Opportunities and Challenges
- 2023
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Ingår i: ChemSusChem. - : John Wiley and Sons Inc. - 1864-5631 .- 1864-564X. ; 16:23
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Forskningsöversikt (refereegranskat)abstract
- Kraft lignin, a by-product from the production of pulp, is currently incinerated in the recovery boiler during the chemical recovery cycle, generating valuable bioenergy and recycling inorganic chemicals to the pulping process operation. Removing lignin from the black liquor or its gasification lowers the recovery boiler load enabling increased pulp production. During the past ten years, lignin separation technologies have emerged and the interest of the research community to valorize this underutilized resource has been invigorated. The aim of this Review is to give (1) a dedicated overview of the kraft process with a focus on the lignin, (2) an overview of applications that are being developed, and (3) a techno-economic and life cycle asseeements of value chains from black liquor to different products. Overall, it is anticipated that this effort will inspire further work for developing and using kraft lignin as a commodity raw material for new applications undeniably promoting pivotal global sustainability concerns.
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| 7. |
- Aulin, Christian, et al.
(författare)
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High strength flexible and transparent nanofibrillated cellulose-nanoclay biohybrid films with tunable oxygen and water vapor permeability
- 2012
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Ingår i: Nanoscale. - : Royal Society of Chemistry (RSC). - 2040-3364 .- 2040-3372. ; 4:20, s. 6622-6628
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Tidskriftsartikel (refereegranskat)abstract
- A novel, technically and economically benign procedure to combine vermiculite nanoplatelets with nanocellulose fibre dispersions into functional biohybrid films is presented. Nanocellulose fibres of 20 nm diameters and several micrometers in length are mixed with high aspect ratio exfoliated vermiculite nanoplatelets through high-pressure homogenization. The resulting hybrid films obtained after solvent evaporation are stiff (tensile modulus of 17.3 GPa), strong (strength up to 257 MPa), and transparent. Scanning electron microscopy (SEM) shows that the hybrid films consist of stratified nacre-like layers with a homogenous distribution of nanoplatelets within the nanocellulose matrix. The oxygen barrier properties of the biohybrid films outperform commercial packaging materials and pure nanocellulose films showing an oxygen permeability of 0.07 cm3 μm m-2 d-1 kPa -1 at 50% relative humidity. The oxygen permeability of the hybrid films can be tuned by adjusting the composition of the films. Furthermore, the water vapor barrier properties of the biohybrid films were also significantly improved by the addition of nanoclay. The unique combination of excellent oxygen barrier behavior and optical transparency suggests the potential of these biohybrid materials as an alternative in flexible packaging of oxygen sensitive devices such as thin-film transistors or organic light-emitting diode displays, gas storage applications and as barrier coatings/laminations in large volume packaging applications.
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| 8. |
- Avadí, Angel, et al.
(författare)
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Towards improved practices in Life Cycle Assessment of seafood and other aquatic products
- 2018
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Ingår i: The International Journal of Life Cycle Assessment. - : Springer Verlag. - 0948-3349 .- 1614-7502. ; 23:5, s. 979-981
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Tidskriftsartikel (refereegranskat)abstract
- Introduction: Aquatic supply chains, based on e.g. fish, molluscs, crustaceans and algae, provide products aimed for direct or indirect human consumption and other uses. Global demand for these products is increasing, but the fact that wild-capture fisheries—supplying inputs for the food and feed industries—have stagnated (FAO 2016), or even declined, has raised questions about the environmental consequences of aquatic supply chains Research applying LCA to seafood products has emerged since the early years of the century and, until today, dozens of case studies of fisheries and aquaculture systems from all around the world have been published. The body of literature in this field has grown to the extent of allowing systematic reviews to be undertaken on specific production sectors, such as for capture fisheries The lifecycle of seafood commodities differs from that of terrestrial production systems in their diversity, in the case of fisheries, the reliance on extraction of a natural resource (fish stocks), their impacts on often unmapped ecosystems (e.g. seafloors and deep sea fish stocks) and the more complex trophic webs of aquatic ecosystems. To capture also these biotic and fisheries-specific impacts, an increasing number of fisheries and aquaculture LCAs apply novel impact categories such as biotic resource use and benthic ecosystems impacts. Aquaculture systems, in addition, often rely on feed resources from capture fisheries, agriculture and livestock, requiring extensive LCI models.Among the existing aquaculture seafood LCA studies, there is a strong focus on salmonids aquaculture in Europe and North America. The globally largest aquaculture sector, carp farming in China, has, however, been poorly covered. Peruvian anchoveta, the world’s largest fishery and the primary source of fishmeal and fish oil, was first modelled in 2014. Consequently, while the number of aquatic LCAs has steadily been increasing, the uniqueness of aquatic production chains and the diversity of species leave many inventories overlooked and some relevant impact categories unaddressed. In response, we initiated this Special Issue (SI), to supplement literature and highlight shortcomings. Thirteen articles were ultimately accepted in the SI
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| 9. |
- Ayele, Workneh Yilma, et al.
(författare)
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Evaluating open data innovation : A measurement model for digital innovation contests
- 2015
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Ingår i: PACIS 2015 Proceedings. - : AIS electronic library.
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Konferensbidrag (refereegranskat)abstract
- Digital innovation contests emerge as important intermediaries in open data markets. However the understanding of how contests affect innovation value chains is low and there is a lack of innovation measurement frameworks to support the management of digital innovation contests. Therefore, in this paper we apply design science to design a measurement model for digital innovation contests from the organizer's perspective that adds to the available knowledge of innovation measurement. We use a recent case of digital innovation contests to motivate the model and discuss its implications on the innovation value chain. The measurement model contributes with new knowledge in the area of open data innovation and provides support for practice in managing innovation through digital innovation contests. For future research we intend to enhance the model to also measure the effects on innovation ecosystems, to operationalize the measures and to evaluate the model in several digital innovation contests as well as to include the perspective of the participants.
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| 10. |
- Berg, Hanna, et al.
(författare)
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Spreading joy : examining the effects of smiling models on consumer joy and attitudes
- 2015
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Ingår i: Journal of Consumer Marketing. - : Emerald. - 0736-3761 .- 2052-1200. ; 32:6, s. 459-469
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Tidskriftsartikel (refereegranskat)abstract
- Purpose - The purpose of this paper is to examine consumer response to pictures of smiling models in marketing, focusing on the roles of emotional contagion from the smiling models and the perceived typicality of marketing with smiling models. Design/methodology/approach - This paper reports the findings from three experimental studies, comparing consumer response to two versions of an advertisement (Study 1) and a packaging design (Study 2 and 3), including either a picture of a smiling or a non-smiling model. To measure consumer response, a combination of self-report questionnaires and eye-tracking methodology was used. Findings - The pictures of smiling models produced more consumer joy and more positive attitudes for the marketing. The positive effects on attitudes were mediated by consumer joy, and the effects on consumer joy were mediated by the perceived typicality of the marketing with smiling models. Originality/value - Despite the ubiquity of photos of smiling faces in marketing, very few studies have isolated the effects of the smile appeal on consumer response to marketing objects. By comparing marketing where the same model is shown smiling or with a neutral facial expression, the positive effects were isolated. The roles of emotional contagion and perceived typicality in this mechanism were also examined and implications of the findings for research and practitioners are discussed.
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