lnu.sePublikationer
Ändra sökning
Avgränsa sökresultatet
1234567 1 - 10 av 342
RefereraExporteraLänk till träfflistan
Permanent länk
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Träffar per sida
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sortering
  • Standard (Relevans)
  • Författare A-Ö
  • Författare Ö-A
  • Titel A-Ö
  • Titel Ö-A
  • Publikationstyp A-Ö
  • Publikationstyp Ö-A
  • Äldst först
  • Nyast först
  • Skapad (Äldst först)
  • Skapad (Nyast först)
  • Senast uppdaterad (Äldst först)
  • Senast uppdaterad (Nyast först)
  • Disputationsdatum (tidigaste först)
  • Disputationsdatum (senaste först)
  • Standard (Relevans)
  • Författare A-Ö
  • Författare Ö-A
  • Titel A-Ö
  • Titel Ö-A
  • Publikationstyp A-Ö
  • Publikationstyp Ö-A
  • Äldst först
  • Nyast först
  • Skapad (Äldst först)
  • Skapad (Nyast först)
  • Senast uppdaterad (Äldst först)
  • Senast uppdaterad (Nyast först)
  • Disputationsdatum (tidigaste först)
  • Disputationsdatum (senaste först)
Markera
Maxantalet träffar du kan exportera från sökgränssnittet är 250. Vid större uttag använd dig av utsökningar.
  • 1.
    Sjökvist, Tinh
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för skog och träteknik (SOT).
    Coated Norway Spruce: Influence of Wood Characteristics on Water Sorption and Coating Durability2019Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    Wood used outdoors is often degraded and discoloured by microorganisms as a natural part of its life cycle, particularly when exposed to high levels of moisture for prolonged times. In this case, the application of a coating (i.e. paint) is an option for increasing the service life of the wood.

    Norway spruce (Picea abies (L.) Karst.) is commonly used for outdoor applications in Sweden. Earlier studies have shown that uncoated spruce heartwood is less prone to moisture sorption in outdoor exposure, resulting in lower moisture content (MC) levels, as compared to sapwood. However, studies related to the above mentioned characteristics are rather limited for coated spruce, especially including the influence of outdoor exposure (i.e. weathering).

    The aim of this thesis is, therefore, to increase the knowledge of how heartwood and sapwood of different densities influence on the durability of coated Norway spruce for outdoor use. Different types of coatings with alkyd-, acrylic-, flour- (calcimine paint), or linseed-oil-based resin were included. The objectives were to study the water sorption (including MC variation) behaviour and crack formation of uncoated and coated heartwood and sapwood of different densities.

    Furthermore was an objective to study the microbial growth on the surface of similar samples of coated spruce in outdoor exposure. The used methods included wetting and liquid permeability experiments, accelerated water absorption (with samples floating freely in water), and outdoor field test. The field method lasted between three to five years and involved monitoring of the MC variation, the crack formation and the microbial growth on the samples.

    The results based on wetting measurements using octane as the adsorbed liquid showed no difference in liquid permeability between the spruce heartwood and sapwood samples of comparable densities, and indicated a similar level of pit aspiration (closure). The common flow path between two cells of conifers occurs through the pits. Still, the sapwood samples had in general a clearly higher water sorption rate than heartwood samples. It could be concluded that the increased sorption was presumably caused by a lowered water surface tension, most likely by a contamination effect of the water by surface-active sapwood extractives rather than differences in morphology of heartwood and sapwood.

    However, no clear difference in water absorption and MC levels was seen between coated heartwood and sapwood in the field study or in the accelerated water absorption study. Thus, it is suggested that a coating hinders the surfaceactive extractives to lower the water surface tension, resulting in a similar water absorption behaviour of coated heartwood and sapwood. The influence of density on water sorption of coated spruce was similarly to uncoated spruce, meaning the low-density samples had a higher MC than the high-density samples in the field tests. Furthermore, a one-year weathering of the coated and uncoated samples caused a larger increase in water sorption of high-density heartwood in the accelerated water absorption study.

    The field study on uncoated and calcimine-coated spruce showed a higher number of cracks on the high-density samples than on the low-density samples. Additionally, within each density group, a larger number of cracks were seen on sapwood samples as compared to heartwood samples. High-density samples with an alkyd- or an acrylic coating also showed a higher number of cracks. As expected, the formation of cracks on the samples increased their water sorption significantly. The microbial growth was higher on sapwood than on heartwood samples with a white coloured alkyd coating.

    The main conclusion is that heartwood and sapwood of different densities influence the water sorption and durability of coated Norway spruce. However, the principles in water sorption of uncoated heartwood and sapwood could not be applied to coated samples. Overall, the results point out that low-density heartwood could be the best material combination to improve the durability of coated spruce in outdoor use. The knowledge acquired in this thesis can enable an increased service life of coated spruce in outdoor use. The increase in service life is achieved by a careful selection of the wood material regarding the proportion of heartwood and to the choice of wood density. As a concluding remark, the role of surface-active spruce extractives needs to be explored, and a follow-up investigation in the context of water sorption is suggested for future research.

  • 2.
    Zimmer, Björn
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap och medieteknik (DM).
    Guided Interaction and Collaborative Exploration in Heterogeneous Network Visualizations2019Doktorsavhandling, monografi (Övrigt vetenskapligt)
    Abstract [en]

    The visual exploration of large and complex network structures remains a challenge for many application fields, such as systems biology or social sciences. Often, various domain experts would like to work together to improve the analysis time or the quality of the analysis results. Collaborative visualization tools can facilitate the analysis process in such situations. Moreover, a growing number of real world networks are multivariate and often interconnected with each other. Entities in a network may have relationships with elements of other related data sets, which do not necessarily have to be networks themselves, and these relationships may be defined by attributes that can vary greatly. A challenge is to correctly assign the attributes and relations between different data sets and graphs in order to be able to analyze them visually afterwards. The navigation between the resulting visualizations is also difficult. How can users be guided to other interesting data points relevant to their current view and how can this information be additionally displayed in a graph without losing the overview of the data?

    In this dissertation, we propose our new web-based visualization environment OnGraX, which supports distributed, synchronous and asynchronous collaboration of networks and related multivariate data sets. In addition to standard collaboration features like event tracking or synchronizing, our client/server-based system provides a rich set of visualization and interaction techniques for better navigation and overview of the input network. Changes made by specific analysts or even just visited network elements can be highlighted by heat maps, which enable us to visualize user behavior data without affecting the original graph visualization. We evaluate the usability of the heat map approach against two alternatives in a user experiment.

    Additional features of OnGraX include a comprehensive visual analytics approach that supports researchers to specify and subsequently explore attribute-based relationships across networks, text documents, and derived secondary data. Our approach provides an individual search functionality based on keywords and semantically similar terms over an entire text corpus to find related network nodes. For examining these nodes in the interconnected network views, we introduce a new interaction technique, called Hub2Go, which facilitates the navigation by guiding the user to the information of interest. To showcase these features, we use a large text corpus collected from papers listed in the IEEE VIS publications data set (1990--2015) that consists of 2,752 documents. We analyze relationships between various heterogeneous networks, a Bag-of-Words index, and a word similarity matrix, all derived from the initial corpus and metadata. We also propose a design for the interactive specification of degree-of-interest functions, which can be used to provide and evaluate configurations for guidance based on network attributes and logged user data in heterogeneous networks.

  • 3.
    Ståhlkrantz, Katarina
    Linnéuniversitetet, Fakulteten för samhällsvetenskap (FSV), Institutionen för pedagogik och lärande (PEL).
    Rektors pedagogiska ledarskap: en kritisk policyanalys2019Doktorsavhandling, monografi (Övrigt vetenskapligt)
    Abstract [en]

    The pedagogical leadership is regarded as the most significant of the principal ́s duties. Because there is no clear definition of pedagogical leadership as a concept, it may be difficult for the principal to know how to practice it. Various versions of the concept’s meaning are currently circulating, in turn offering different norms to relate to and act upon. This doctoral thesis takes its point of departure from the policy proposal of a Rektorslyft in the Swedish national budget of 2011, as a solution to the problem that principals were not considered to be good enough pedagogical leaders. The study is designed as a critical policy analysis, with a curriculum theory framework and a critical interpretative perspective. The critical approach is directing focus towards the steering of the school. Further, a poststructuralist perspective adds a discursive approach to the study. The empirical material consists of a selection of official education policy documents, mainly governmental official reports. The aim of the study is to examine and analyse how the pedagogical leader is discursively constructed in official education government documents, what changes and stabilities can be distinguished in these discursive constructions over time and how these can be understood and explained. Bacchi ́s WPR-method and Foucault ́s genealogy is used as a methodological framework for the text analysis. The result shows six discursive breakpoints in the construction of the pedagogical leader from the 1950s to 2010s. These breakpoints have a close relationship to changes in school steering. Principals’ pedagogical leadership can therefore be regarded as a policy to legitimise new steering reforms. The result further indicates that principals from the 1950s to 2010s were given a clearer personal responsibility within the pedagogical leadership. The changes identified through the critical policy analysis can be explained by the context and policy streams. The text analysis also indicated stabilities in the discursive construction of the pedagogical leader. These stabilities can be explained by traditions and school structures. Hopefully, this study has contributed to a better and deepened understanding of principals’ pedagogical leadership, as well as have given the concept an empirical and theoretical basis.

  • 4.
    Nordmark, Susanna
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap och medieteknik (DM).
    A Multimodal Seamless Learning Approach Supported by Mobile Digital Storytelling (mDS)2018Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    The use of digital tools such as smartphones, tablets and laptops have shown potential to enhance teaching and learning in a wide variety of contexts. 21st century skills such as creativity, problem-solving and innovation as means for supporting learning and knowledge creation, are considered fundamental proficiencies in today's technology- driven society, and they are therefore considered essential to promote, already from the earliest of school years. Hence, there are a number of challenges related to how to design and implement innovative and varied strategies

    for teaching and learning supported by mobile technologies in educational settings. Moreover, it is also crucial to think about how to actively involve teachers into the processes mentioned above, inspiring and inviting them to implement new methods and technologies into their everyday educational practices.

    The work presented in this thesis embodies a series of co-design and design-based research efforts aiming at exploring the interplay between design, information and communication technologies and learning through mobile digital storytelling, guided by the theoretical frameworks of constructivism, multimodality, new media literacies, mobile seamless learning, and technology enhanced learning. Two main research questions have been identified as formulated below, and have served as

    the basis that guided my efforts:

    What design features are necessary to scaffold mobile seamless learning approaches with the support of mobile digital storytelling?

    Considering the role of mobile digital storytelling for educational settings: which design factors and learning requirements could guide and support similar initiatives?

    Over the years of my doctoral studies, a progression of research interventions involving teachers, pupils, and museum staff have been co-designed, developed, tested and validated. These efforts have resulted in a method, a mobile application, and a web service for mobile digital storytelling in educational contexts, named the mobile digital storytelling (mDS) system.

    The mDS system introduces learning technology approaches aiming to support teacher and pupil digital inclusion, mobile seamless learning and multimodal aspects, and serves as a reflective instrument for both collaborative and individual work. The validation of mDS in different educational settings indicates that it can be independent of subject matter, user age, locality and previous knowledge of technology enhanced learning, and is easy to access and manage for teachers as well as pupils. Hence, it proposes several innovative means on multiple levels for meeting the 21st century skills required for supporting contemporary learning and knowledge creation.

  • 5.
    Perez, Miguel
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för matematik (MA).
    A teacher-centred design system to integrate digital technologies in secondary mathematics classrooms2018Doktorsavhandling, monografi (Övrigt vetenskapligt)
    Abstract [en]

    Despite efforts made by teachers and researchers, studies show that digital technologies have not improved conditions for teaching and learning mathematics to the degree expected by stakeholders inside as well as outside the school system.

    In this research, the problem of the integration of digital technologies is addressed through the perspective of design. It sets out to explore the conditions where educational design researchers may succeed in producing valuable and sustainable contributions to teacher change. The design approach developed and used for this purpose is Agile Educational Design (AED). It shares many of the common features of other design methodologies within the field; however, the AED approach is an explicit systems approach to design based on the Singerian philosophy of design. Rather than focus on ready-made products or other resources such as curriculum material, professional development or design principles, the focus is on processes and supporting teachers’ operationalisation of theoretical principles to achieve change. It is argued that all phases of the design process need to be considered from a research perspective. The developmental phases cannot be treated as uncomplicated inputs that only serve as a ‘design base’ for research activities. The Anthropological Theory of the Didactic is used as an overall theoretical framework to describe all aspects of the design process and to analyse the empirical data which consists of three design cycles related to three different ways of interacting with teachers. The design cycles were carried out in various settings, including different schools (secondary level) and with different teachers and different learning objectives. The dynamic geometry software GeoGebra was used in all three cycles.

    The results highlight some of the internal and external constraints that hinder teachers from integrating digital technologies in an effective way to support students learning mathematics. Digital technologies introduce important epistemological changes in the mathematical content that may explain some of the teachers’ difficulties in exploiting the full potential of digital technologies. However, giving teachers the responsibility for orchestrating lessons in accordance with theoretical principles provided by a researcher showed promising results regarding achieving sustainable changes in teachers’ practices. 

  • 6.
    Gunnarsson, Fredrik
    Linnéuniversitetet, Fakulteten för konst och humaniora (FKH), Institutionen för kulturvetenskaper (KV). Kalmar County Museum.
    Archaeological Challenges, Digital Possibilities: Digital Knowledge Development and Communication in Contract Archaeology2018Licentiatavhandling, monografi (Övrigt vetenskapligt)
    Abstract [sv]

    Den här forskningen har studerat digitaliseringen av arkeologin med fokus på svensk uppdragsarkeologi. Målet har varit att öka förståelsen kring hur disciplinen förhåller sig till de förändringar som digitaliseringens innebär och människans roll i dessa processer. Avhandlingen är en studie av digitaliseringens betydelse för de arkeologiska processer som berör kunskapsproduktion och kommunikation. Arbetet problematiserar förståelsen av digitala data inom dessa kontexter men visar också på digitaliseringenspotential och hur arkeologin kan dra nytta av den. Forskningen aktualiserar på nytt det teoretiska angreppssättet reflexivitet i ett digitalt sammanhang och kombinerar detta med kommunikationsteorier i syfte att utmana det arkeologiska arbetsflödet och knyta det närmare dagens samhälle. Resultatet av denna forskning visar på att digital kommunikation baserad på arkeologiskt källmaterial kan vara något mer än förmedling av resultat. Med interaktivt historieberättande finns vägar att skapa emotionella virtuella kopplingar mellan användare och arkeologi som relaterar till nuet och detomgivande samhället. Genom att länka ihop den arkeologiska tolkningsprocessen med kommunikation, skapas möjligheten för kunskapsproduktion att bli kunskapsutveckling.

  • 7.
    Wang, Zhizheng
    Linnéuniversitetet, Ekonomihögskolan (FEH), Institutionen för nationalekonomi och statistik (NS).
    Aspects of Moment Testing when p>n2018Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [sv]

    Avhandlingen undersöker hypotesprövning i höga dimensioner, under förutsättning att det så kallad Kolmogorovvillkoret (Kolmogorov condition) är uppfyllt. Villkoret innerbär att antalet parametrar ökar tillsammans med storleken på stickprovet med en konstant hastighet. Till kategorin multivariat analys räknas de statistiska metoder som analyserar stickprov från flerdimensionella fördelningar, särskilt multivariat normalfördelning. För högdimensionella data fungerar klassiska skattningar av kovariansmatris inte tillfredställande eftersom komplexiteten med att skatta den inversa kovariansmatrisen ökar när dimensionen ökar. I den första uppsatsen utförs en genomgång av Dempsters (non-exact) test där skattning av den inversa kovariansmatrisen inte behövs. Istället används spåret (trace) av en kovariansmatris. I den andra uppsatsen testas antagandet om normalfördelning med hjälp av tredje och fjärde ordningens moment. Tre olika testvariabler har föreslagits där sumuleringar också presenteras för att jämföra hur väl en icke-normalfördelning identifieras av testet.

  • 8.
    Krantz, Joakim
    et al.
    Linnéuniversitetet, Fakulteten för samhällsvetenskap (FSV), Institutionen för didaktik och lärares praktik (DLP).
    Sundberg, DanielLinnéuniversitetet, Fakulteten för samhällsvetenskap (FSV), Institutionen för didaktik och lärares praktik (DLP).
    Att leda lärande: En vänbok till Per Gerrevall2018Samlingsverk (redaktörskap) (Övrigt vetenskapligt)
    Abstract [sv]

    Leda lärande är en vänbok till professor emeritus Per Gerrevall vid Linnéuniversitetet. Ett tjugotal medverkande kollegor, forskare och lärare tar upp olika aspekter av ledning och ledarskap i olika pedagogiska kontexter och verksamheter. De olika verksamhetsområdena som tematiseras i boken är akademi och högre utbildning, idrottsfältet och de pedagogiska professionerna.

    Kapitlen i boken anknyter till några av de forsknings- och verksamhetsområden som Per arbetat inom under en lång framgångsrik och inspirerande karriär inom akademin. På temat leda lärande ger bokens innehåll olika infallsvinklar på hur pedagogiska praktiker utvecklas och förfinas genom de ställningstaganden och val som framsynta lärare och ledare gör. Det gäller såväl inom högre utbildning, där ledare märker ut frågor, perspektiv och utforskningar inom kunskaps- och forskningsfronterna. Det gäller inom idrottsfältet där de goda och framgångsrika ledarna ser nästa steg i talangens utveckling. Och, det gäller också inom utbildning och skola där den pedagogiska ledaren tillsammans med de studerande märker ut mål och navigerar mot uppsatta mål i de lärandes bildningsgång.

    Bokens olika kapitel ger sammantaget en rik repertoar av nycklar för att leda lärande på ett kvalificerat sätt och för att tackla några av de utmaningar som lärandefrågorna, internationellt och nationellt, står inför i en tid av stora samhälleliga omställningar. Alla med intresse för frågor om ledning, lärande och pedagogik har utbyte av bokens olika kapitel såväl som i professor Per Gerrevalls verk och gärning.

     

     

  • 9.
    Lindberg, Rebecka
    Linnéuniversitetet, Fakulteten för samhällsvetenskap (FSV), Institutionen för pedagogik och lärande (PEL).
    Att synliggöra det förväntade: förskolans dokumentation i en performativ kultur2018Licentiatavhandling, monografi (Övrigt vetenskapligt)
    Abstract [en]

    The aim of the study is to use the documentation produced and made public in preschool to contribute with knowledge about values in preschool performative documentation practice. The study focuses on seemingly valuable actions in the documentations studied.

    Ball’s performativity concept has been applied to analyze the documentationsthat form the basis of the study. The theoretical concepts of fabrication and second-order activity have been used in the analysis of the material. In addition, core actions within a performative culture characterized by displays, judgements and comparisons form the basis of the analysis. The empirical material consists of documentation produced and made public in preschool bybeing posted on walls and in children’s files.

    Eight categories of valuable actions emerge from the material: actions related to learning and knowledge, social actions, self-control and obedience, independence, creativity and curiosity, ethical actions, participation and influence, as well as joy and wellbeing.

    The result shows that actions related to learning and knowledge form the core in preschool documentation practice. Besides representing an overwhelming majority of the documentation studied, they are also included in other valuable action categories. Actions playing a minor role in the material include ethical actions as well as participation and influence. The focus of learning and knowledge lies mainly on particular subjects or curriculum areas, such as language, mathematics and science. Most documentation also demonstrates a goal and result orientation which indicates the importance of learning and knowledge. The children are the ones made visible in preschool documentation, while teachers are relatively invisible. The documentation focuses on the knowledge and skills of the children. The assessments are made both implicitly, by highlighting certain actions as valued, and explicitly, bytesting children’s knowledge and abilities by check-up tasks or interviews. Comparisons are not normally made between children, but rather bycomparing children’s current knowledge and skills with what they havedemonstrated previously. The majority of the documents lack information onpreschool contributions to improvements in children’s knowledge.

    Performative elements like performance, examination, evaluation, check-ups, goal orientation, result orientation and focus on the individual are most distinctly linked to the category of learning and knowledge. This indicates a connection that may contribute to primarily highlighting learning and knowledge in the documentation. This category includes all the analysis concepts that are used in the study and are relevant in a performative culture. Hence, a strong focus on learning and knowledge is in itself an indication that the documentation practice should be characterized as performative.

  • 10.
    Modell, Nina
    Linnéuniversitetet, Fakulteten för samhällsvetenskap (FSV), Institutionen för pedagogik och lärande (PEL).
    Att tävla för betyg: gymnasieelevers bild av ämnet idrott och hälsa genom bedömningspraktiken2018Licentiatavhandling, monografi (Övrigt vetenskapligt)
    Abstract [sv]

    Syftet är att undersöka och förstå hur elever på gymnasienivå uppfattar ämnet idrott och hälsa genom den bedömningspraktik de erfar. Ett delintresse utgörs av innehållet i bedömningspraktiken och vilken bild av ämnet som därigenom framträder. Ett andra delintresse är vad eleverna uppfattar ligger till grund för själva bedömningen. Ett tredje delintresse är riktat mot bedömningspraktiken i stort och på vilka sätt eleverna uppfattar i vad mån denna ger dem likvärdiga förutsättningar att visa vad de kan.

    Elevernas uppfattningar har studerats med hjälp av fokusgruppsintervjuer med inspiration i tre olika vinjetter. I studien deltog 38 elever på fyra olika gymnasieskolor. För att vidare kunna förstå och analysera elevernas uppfattningar användes ett nyinstitutionellt perspektiv där normativa, regulativa och kulturella villkor står i förgrunden (Scott 2008). De regulativa och de normativa villkoren förstås utifrån olika styrdokument och de kulturella villkoren utifrån tidigare forskning om ämnet.

    Analysen visar att den institutionaliserade föreningsidrotten får företräde framför både skolans styrdokument och ett mindre institutionaliserat hälsoområde. Vissa normerande inslag uppfattas som viktiga, speciellt de som kan kopplas till fostrande aspekter så som exempelvis samarbete, hänsyn, förståelse och fair play, medan andra normerande och reglerande villkor negligeras eller nämns inte alls, som exempelvis friluftsliv. Detta skulle kunna förstås som att det framför allt är de kulturella villkoren i form av föreningsidrott som påverkar elevernas uppfattningar om ämnet idrott och hälsa. De intervjuade eleverna uppfattar idrott och hälsa i stora drag som ett orättvist ämne. Det finns de elever som kan ”rätt” idrott och samtidigt finns de som inte har dessa färdigheter och ingen av eleverna uppfattar att de kommer till sin rätt i ämnet.

1234567 1 - 10 av 342
RefereraExporteraLänk till träfflistan
Permanent länk
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf