| 1. |
- Bohlin, Erik, 1968-
(författare)
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Optics of coated paperboard : Aspects of surface treatment on porous structures
- 2010
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Calendering of coated and uncoated paper is widely used to enhance optical properties such as gloss and print quality. The aim of this thesis is to characterize coatings and prints, and to validate models using experimental results from optical measurements of physical samples. Calendering of coated paper often leads to a brightness decrease. The mechanism for this is not altogether clear. One common explanation is that the porosity of the coating layer decreases and hence the scattering decreases. By comparing simulated and measured results it was shown that modifications of the surface properties account for the brightness decrease of ground calcium carbonate coated substrates with calendering. Monte Carlo light scattering simulations, taking into account the measured decrease of surface microroughness and increased effective refractive index, showed that surface modifications accounted for most of the observed brightness decrease of the ground calcium carbonate coated substrate, whereas the bulk scattering and absorption coefficients were not affected by calendering. It was also shown that the scattering coefficient is significantly dependent on the coat weight whereas the physical absorption coefficient is not. The penetration of ink in the z-direction of a substrate influences the quality of the print. The ink penetration affects print density, mottling and dot gain, common print effects that influence the preference of consumers. The pressure in the printing nip and the porosity of the substrate both affect the amount of ink that is pressed into the porous structure of a coating layer during printing. By printing pilot coated paperboard with different coating porosity and measuring the resulting optical properties of the prints, a basis for simulations of the different layers, that is to say the coating, the print and the mixed layer in between, was created. Results show that ink distribution is strongly affected by the roughness of the substrate. Fibres and fibre flocks underneath the two coating layers created an unevenly distributed coating thickness that affected the print quality. Differences in pore size and pore size distribution also affected the behaviour of the ink. A coating layer of broad pigment particle size distribution resulted in a relatively low print density, in comparison to coatings of narrowly distributed particle sizes. Comparison of dot gain showed that the coating layer of a narrow particle size distribution had a relatively low dot gain compared to others. In this work, these results are explained by the differences in ink distributions on and in the coating layers.
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| 2. |
- Ekberg, Niclas, et al.
(författare)
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Projekt: Pekplattan som resurs – ett pedagogiskt verktyg för lärare och lärande
- 2014
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Annan publikation (populärvet., debatt m.m.)abstract
- Sammanfattning: Projektet syftar till att utforska pekplattans pedagogiska möjligheter och utveckla metoder som berikar undervisningen och lärandet. Vi avser använda pekplattan för kommunikation och interaktion, för pedagogiska framställningar, som organisatoriskt stöd för studenten i dennes studier och som del i lärarens dagliga administrativa arbete. Vi ämnar även utveckla metoder för att bättre tillvarata lärandets multimodala aspekter, dvs. att med utgångspunkt i olika kombinationer av bild, film, ljud och skriven text finna nya vägar till kunskapsrepresentation och reflektion. Projektet bidrar således till en flexiblare lärmiljö, högre kvalitet i undervisningen samt till studentens engagemang och självständighet att själv göra, äga och visa. Utvecklingsprojektet fokuserar förskollärarprogrammets lärare och studenter, med dess profilering mot naturvetenskap och teknik, och i förlängningen studentens professionalitet i yrkesrollen. Resultaten blir dock högst relevanta för lärare och studenter på LTU:s övriga utbildningar. Resultatspridning sker genom projektrapport, anordnande av öppna seminarier och i våra pedagogiska nätverk inom och utom universitetet. Projektet beviljades medel av dels IT-beredningen, LTU, december 2013, uppgående till 200TKr och dels Pedagogisk utvecklingsfond, Luleå tekniska universitet, maj 2014 (omgång 3) uppgående till 440TKr
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| 3. |
- Ahlgren, Per, 1960-, et al.
(författare)
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A bibliometric analysis of battery research with the BATTERY 2030+ roadmap as point of departure
- 2022
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- In this bibliometric study, we analyze the six battery research subfields identified in the BATTERY 2030+ roadmap: Battery Interface Genome, Materials Acceleration Platform, Recyclability, Smart functionalities: Self-healing, Smart functionalities: Sensing, and Manufacturability. In addition, we analyze the entire research field related to BATTERY 2030+ as a whole, using two operationalizations. We (a) evaluate the European standing in the subfields/the BATTERY 2030+ field in comparison to the rest of the world, and (b) identify strongholds of the subfields/the BATTERY 2030+ field across Europe. For each subfield and the field as a whole, we used seed articles, i.e. articles listed in the BATTERY 2030+ roadmap or cited by such articles, in order to generate additional, similar articles located in an algorithmically obtained classification system. The output of the analysis is publication volumes, field normalized citation impact values with comparisons between country/country aggregates and between organizations, co-publishing networks between countries and organizations, and keyword co-occurrence networks. For the results related to (a), the performance of EU & associated (countries) is similar to China and the aggregate Japan-South Korea-Singapore and well below North America regarding citation impact and with respect to the field as a whole. Exceptions are, however, the subfields Battery Interface Genome and Recyclability. For the results related to (b), there is a large variability in the EU & associated organizations regarding volume in the different subfields. For citation impact, examples of high-performing EU & associated organizations are ETH Zurich and Max Planck Society for the Advancement of Science.
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| 4. |
- Ahlgren, Per, 1960-, et al.
(författare)
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BATTERY 2030+ and its Research Roadmap : A Bibliometric Analysis.
- 2023
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Ingår i: ChemSusChem. - : Wiley. - 1864-5631 .- 1864-564X. ; 16:21
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Tidskriftsartikel (refereegranskat)abstract
- In this bibliometric study, we analyze two of the six battery research subfields identified in the BATTERY 2030+ roadmap: Materials Acceleration Platform and Smart functionalities: Sensing. In addition, we analyze the entire research field related to BATTERY 2030+ as a whole. We (a) evaluate the European standing in the two subfields/the BATTERY 2030+ field in comparison to the rest of the world, and (b) identify strongholds of the two subfields/the BATTERY 2030+ field across Europe. For each subfield and the field as a whole, we used seed articles, i. e. articles listed in the BATTERY 2030+ roadmap or cited by such articles, in order to generate additional, similar articles located in an algorithmically obtained classification system. The output of the analysis is publication volumes, field normalized citation impact values with comparisons between country/country aggregates and between organizations, co-publishing networks between countries and organizations, and keyword co-occurrence networks.
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| 5. |
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| 6. |
- Bohlin, Erik, 1968-, et al.
(författare)
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Characterization and modelling of the effect of calendering on coated polyester film
- 2009
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Ingår i: Advances in Printing and Media Technology. ; , s. 301-308
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Konferensbidrag (refereegranskat)abstract
- Polyester films were coated with a coating colour based on a ground calcium carbonate with narrow particle size distribution. Four different coat weights were produced. The coated sheets were calendered and the samples were exposed to up to twenty nips in the calender at a line load of 300 kN/m at 50°C. The brightness and the thickness were measured after each calendering nip. Reflectometry was used to measure the refractive index and the microroughness of the samples. Calendering lead to a decrease of the Kubelka-Munk scattering coefficient and an increase of the absorption coefficient of the coated transparent films. Taking into account non-uniform surface reflection at the boundaries between media of different refractive indices, a large part of the reflectance decrease due to calendering could be attributed to an increase of the effective refractive index at the coating surface and a decrease of the surface microroughness.
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| 7. |
- Bohlin, Erik, 1968-, et al.
(författare)
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Modelling of brightness decrease in coated cartonboard as an effect of calendering : Microroughness and effective refractive index aspects
- 2010
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Ingår i: 11th Advanced Coating Fundamentals Symposium Proceedings: The Latest Advances in Coating Research and Development. - Norcross, GA, USA : TAPPI Press. - 1595102035 - 9781595102034 ; , s. 51-65
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Konferensbidrag (refereegranskat)abstract
- Calendering of coated paper leads to a brightness decrease. The mechanism for this is not clear, although it has been discussed in the past. One common explanation is that the porosity of the coating layer decreases and hence scattering. By comparing simulated and measured results this paper shows that modifications of the surface properties account for the brightness decrease of GCC coated substrates with calendering. The effect of a deformable cartonboard substrate is investigated here and compared to a less deformable plastic film substrate. From simulations based on a two-layer Kubelka-Munk model, it is shown that the brightness decrease of the cartonboard due to calendering has a negligible contribution to the brightness decrease of the coated cartonboard. The brightness decrease was similar for coated plastic film and coated cartonboard. The thickness of GCC coated plastic films was not affected by calendering irrespectively of the pigment and latex size distribution. Monte Carlo light scattering simulations, taking into account the measured decrease of surface microroughness and increased effective refractive index, showed that surface modifications accounted for most of the observed brightness decrease of the GCC coated substrate, whereas the bulk scattering and absorption coefficients were not affected by calendering. It is also shown that the scattering coefficient is significantly dependent on the coat weight whereas the physical absorption coefficient is not.
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| 8. |
- Bohlin, Erik
(författare)
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Surface and porous structure of pigment coatings : Interactions with flexographic ink and effects on print quality
- 2013
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Each day, we are confronted with a large amount of more or less important information that we have to consider, and even in our digital society we need paper for communication, documentation and education. Much of the paper we use or are confronted by in our daily life, such as newspapers, books and packages, contains printed images or texts, and the appearance of both the print and the supporting surface is important. A good contrast between a printed text and the paper makes it easier to read, a detailed print of an illustration makes it more informative, and clear and evenly distributed colours on a package or on a poster make it more appealing. All of these qualities depend on the optical properties of the paper product and the the behavior of light illuminating the different materials.The aim of the work described in this thesis is to characterize the structure of coatings and prints, and to validate models for the optical response and interaction of ink and coating based on optical measurements of physical samples. It is the interactions between the printing ink and the porous structure of the coating layers that are subject to investigation. Experiments have been employed to relate the physical conditions in a flexographic printing nip to the ink setting, affected by the physical and chemical properties of the coating, to the resulting optical response of the printed paperboard.
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| 9. |
- Broman Åkesson, Johanna, 1969-
(författare)
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Med Gårdagens Dörr på glänt : Povel Ramel och melodins epok
- 2009
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The aim of this dissertation is to examine the style of the Swedish entertainer Povel Ramel (1922-2007) as a composer and lyricist of popular songs, and to elucidate his relation to the older popular music culture, denoted "the age of melody". In the main part of the study the author analyses more than 80 works by Ramel, which he created in the 1950s and 60s. Many of the most characteristic features of the age of melody are outlined as a background to the analysis. The age of melody was the first period of popular music in the Western world - from the music hall to the bossa nova. It ended when rock became dominant over older types of popular song ("schlager"). Its musical roots were in the 19th century European parlour and dance music but gradually it became more and more influenced by American folk music. Along with the development from the pre-industrial world to the modern, urban, industrial world there emerged strong tensions between old familiar national traditions and new foreign temptations and threats. These tensions marked both the intellectual modernism and the popular culture through the whole age. Povel Ramel was in many ways the typical composer of the age of melody. His work encompasses all its predominant styles, genres and features; he catches the humour, the optimism, the distance and the tension between the old and the new, the Swedish and the foreign. And yet he was unique. His uniqueness lies in his attention and awareness of these styles and features, and in his concentrated and varied interpretations of them. He reflected the notional worlds of the age of melody in both poetical and philosophical ways, but most of all - with an unusual sincere playfulness.
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| 10. |
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