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  • 8951.
    Zhu, J. W.
    et al.
    Iowa State University.
    Unelius, C. Rikard
    Park, K. C.
    Iowa State University.
    Ochieng, S. A.
    Iowa State University.
    Obrycki, J. J.
    Iowa State University.
    Baker, T. C.
    Iowa State University.
    Identification of (Z)-4-tridecene from defensive secretion of green lacewing, Chrysoperla carnea2000In: Journal of Chemical Ecology, ISSN 0098-0331, E-ISSN 1573-1561, Vol. 26, no 10, p. 2421-2434Article in journal (Refereed)
    Abstract [en]

    We report the identification of a defensive secretion from the green lacewing, Chrysoperla carnea. By using combined gas chromatography-electroantennographic detection (GC-EAD), we found one major compound in the solvent extract of this secretion that elicited a significant EAD response from the antenna. Based upon its characteristic fragments from gas chromatography-mass spectrometry (GC-MS) analysis, the compound was identified as a tridecene. Dimethyldisulfide derivatization suggested that a double bond was located between positions 4 and 5 in the carbon chain. Thus, the compound was tentatively identified as a 4-tridecene. Coinjection of the extract with a mixture of the Z or E form of the synthetic 4-tridecene revealed that the unknown was (Z)-4-tridecene. EAG dose-responses showed a direct correlation to dose. Single sensillum recordings from sensilla trichodea situated on the antennae suggested the presence of receptor neurons specifically responding to this compound. An arrestment behavior was observed when tested in the Y-tube olfactometer. Preliminary field trapping results indicate that the compound is an antagonist to attraction. The avoidance behavior of predatory ants, observed when tested with the synthetic compound of this secretion further suggested a defensive function.

  • 8952.
    Zhu, Ling
    et al.
    University of Oxford, UK ; The Pirbright Institute, UK.
    Wang, Xiangxi
    Chinese Academy of Science, China.
    Ren, Jingshan
    University of Oxford, UK.
    Porta, Claudine
    University of Oxford, UK ; The Pirbright Institute, UK.
    Wenham, Hannah
    The Pirbright Institute, UK.
    Ekström, Jens-Ola
    Linnaeus University, Faculty of Health and Life Sciences, Department of Chemistry and Biomedical Sciences.
    Panjwani, Anusha
    The Pirbright Institute, UK.
    Knowles, Nick J.
    The Pirbright Institute, UK.
    Kotecha, Abhay
    University of Oxford, UK.
    Siebert, C. Alistair
    University of Oxford, UK.
    Lindberg, A. Michael
    Linnaeus University, Faculty of Health and Life Sciences, Department of Chemistry and Biomedical Sciences.
    Fry, Elizabeth E.
    University of Oxford, UK.
    Rao, Zihe
    Chinese Academy of Science, China ; Tsinghua University, China.
    Tuthill, Tobias J.
    The Pirbright Institute, UK.
    Stuart, David I.
    University of Oxford, UK ; Harwell Science and Innovation Campus, UK.
    Structure of Ljungan virus provides insight into genome packaging of this picornavirus2015In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 6, article id 8316Article in journal (Refereed)
    Abstract [en]

    Picornaviruses are responsible for a range of human and animal diseases, but how their RNA genome is packaged remains poorly understood. A particularly poorly studied group within this family are those that lack the internal coat protein, VP4. Here we report the atomic structure of one such virus, Ljungan virus, the type member of the genus Parechovirus B, which has been linked to diabetes and myocarditis in humans. The 3.78-angstrom resolution cryo-electron microscopy structure shows remarkable features, including an extended VP1 C terminus, forming a major protuberance on the outer surface of the virus, and a basic motif at the N terminus of VP3, binding to which orders some 12% of the viral genome. This apparently charge-driven RNA attachment suggests that this branch of the picornaviruses uses a different mechanism of genome encapsidation, perhaps explored early in the evolution of picornaviruses.

  • 8953.
    Zhu, Mingjie
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Liu, Qinghua
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    XAP Integration2006Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Abstract

    This bachelor thesis will present the XAP tool integration project. Apart from presenting the survey of

    integration techniques that includes integration models and case tool models, we have conducted a

    comparison of these models. Then we reason about their applicability in the XAP setting. We apply this

    survey into the XAP tool integration project – integrate three tools in one IDE on data level. In this IDE,

    the user can create a new project and use these three tools freely in the new created project. The

    database among them is shared.

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  • 8954.
    Zhyganov, Volodymyr
    Linnaeus University, Faculty of Technology, Department of Informatics.
    Achieving and Maintaining IS/IT Alignment in Organizations2013Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The alignment between IS/IT and business is one of the ways to achieve a significant competitive advantage for any organization. It is more important nowadays since any organization can buy any technology in the open market, so technologies themselves don’t give a significant competitive advantage.  Although the concept of the alignment has two decades of the history, it still has a lot of controversial issues and knowledge gaps such as uncertain understanding of the essence of the concept, the complexity of practical implementation and not paying attention to the social dimension of the alignment, i.e. the importance of mutual understanding and collaboration of IT and business executives. The current research aims to investigate the concept of alignment and finds out how an organization can achieve and maintain the IS/IT alignment. Also, this study explores the importance of the social dimension in the alignment concept, clarifies the essence of the IS/IT alignment and investigates how some theoretical concepts can really work in practice. There are many evidences in information systems management literature which describe that strategic alignment is necessary for profit organizations but there are very few which mention that strategic alignment is also important in non-profit academic institutions. During our current research we investigate how this concept works in Linnaeus University and how important it is to achieve and maintain an alignment in any university. In order to achieve the goal of the current research, the relevant information systems management literature was reviewed from a new perspective – a resource-based theory and a unified framework was proposed as a base for the further practical investigation.

    This research is based on a qualitative approach. By using a qualitative approach, we won’t miss anything important and can determine the maximum number of respondents' opinions. The primary data was collected by conducting private semi-structured interviews. The respondents are employees of a big nonprofit organization with the implemented business strategy, IT department and several information systems in use – Linnaeus University. The data were presented and analyzed according to the research questions and presented framework. The current study demonstrates the concept more clearly and tries to reassess the structure of IS/IT alignment. This research provides «a fresh look» at the concept of IS/IT alignment.

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  • 8955.
    Zimmer, Björn
    Linnaeus University, Faculty of Technology, Department of computer science and media technology (CM).
    Guided Interaction and Collaborative Exploration in Heterogeneous Network Visualizations2019Doctoral thesis, monograph (Other academic)
    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.

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  • 8956.
    Zimmer, Björn
    et al.
    University of Applied Sciences and Arts Hannover, Germany.
    Ackermann, Dennie
    University of Applied Sciences and Arts Hannover, Germany.
    Schröder, Manfred
    HFN Medien GmbH, Ehlbeek 3, 30938, Burgwedel, Germany.
    Kerren, Andreas
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Ahlers, Volker
    University of Applied Sciences and Arts Hannover, Germany.
    Comparative Visualization of User Flows in Voice Portals2011In: Graph Drawing: 18th International Symposium, GD 2010, Konstanz, Germany, September 21-24, 2010. Revised Selected Papers, Berlin Heidelberg: Springer, 2011, p. 404-405Chapter in book (Refereed)
    Abstract [en]

    Voice portals are widely used to guide users interactively through an application. Recent portals provide a growing number of functions in one application, thus increasing their complexity. This work presents flow-map-based techniques for the comparative visualization of user flows at different time frames, in order to enable dialog designers to analyze and improve the user interaction with these systems.

    Natural Language Systems in Voice Portals: More sophisticated voice portals use natural language systems (NLS), giving users the option to actually “talk” to the system in whole sentences. The system tries to interpret these sentences and interactively asks the user for detailed information, if necessary. Portals using NLS are rather large and complex, making it difficult to analyze their performance. Especially after applying changes to a voice portal or in case of technical problems, it is important to be able to analyze the consequences on user flows in the system.

  • 8957.
    Zimmer, Björn
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Jusufi, Ilir
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Kerren, Andreas
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Analyzing Multiple Network Centralities with ViNCent2012In: Proceedings of SIGRAD 2012: Interactive Visual Analysis of Data, November 29-30, 2012, Växjö, Sweden, / [ed] Andreas Kerren and Stefan Seipel, Linköping: Linköping University Electronic Press, 2012, p. 87-90Conference paper (Refereed)
    Abstract [en]

    The analysis of multivariate networks is an important task in various application domains, such as social networkanalysis or biochemistry. In this paper, we address the interactive visual analysis of the results of centralitycomputations in context of networks. An important analytical aspect is to examine nodes according to specific centralityvalues and to compare them. We present a tool that combines exploratory data visualization with automaticanalysis techniques, such as computing a variety of centrality values for network nodes as well as hierarchicalclustering or node reordering based on centrality values. Automatic and interactive approaches are seamlesslyintegrated in one single tool which provides insight into the importance of an individual node or groups of nodesand allows quantifying the network structure.

  • 8958.
    Zimmer, Björn
    et al.
    Linnaeus University, Faculty of Technology, Department of computer science and media technology (CM), Department of Computer Science.
    Kerren, Andreas
    Linnaeus University, Faculty of Technology, Department of computer science and media technology (CM), Department of Computer Science.
    Applying Heat Maps in a Web-Based Collaborative Graph Visualization2014In: Poster Abstracts of IEEE VIS 2014, 2014Conference paper (Refereed)
    Abstract [en]

    The visual analysis of large and complex networks is a challenging task in many fields, such as systems biology or social sciences. Often, various domain experts work together to improve the analysis time or the quality of the analysis results. Collaborative visualization tools can facilitate this process. We propose a new web-based visualization environment which supports distributed, synchronous and asynchronous collaboration for graphs with up to 10,000 nodes and edges. In addition to standard collaboration features like event tracking or synchronizing, our client/server-based system provides visualization and interaction techniques for better navigation, guidance and overview of the overall data set. During asynchronous collaborations, network changes made by specific analysts or even just visited elements are highlighted on demand by heat maps. These heat map representations are user-sensitive in a sense that the current analyst is able to perceive which changes were made by others. 

  • 8959.
    Zimmer, Björn
    et al.
    Linnaeus University, Faculty of Technology, Department of Computer Science.
    Kerren, Andreas
    Linnaeus University, Faculty of Technology, Department of Computer Science.
    Displaying User Behavior in the Collaborative Graph Visualization System OnGraX2015In: Graph Drawing and Network Visualization: 23rd International Symposium on Graph Drawing and Network Visualization, GD 2015, Los Angeles, CA, USA, September 24-26, 2015, Revised Selected Papers / [ed] Emilio Di Giacomo; Anna Lubiw, Springer, 2015, p. 247-259Chapter in book (Refereed)
    Abstract [en]

    The visual analysis of complex networks is a challenging task in many fields, such as systems biology or social sciences. Often, various domain experts 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. We propose a new web-based visualization environment which supports distributed, synchronous and asynchronous collaboration. 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 are highlighted on demand by heat maps. They 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.

  • 8960.
    Zimmer, Björn
    et al.
    Linnaeus University, Faculty of Technology, Department of Computer Science.
    Kerren, Andreas
    Linnaeus University, Faculty of Technology, Department of Computer Science.
    Harnessing WebGL and WebSockets for a Web-Based Collaborative Graph Exploration Tool2015In: Engineering the Web in the Big Data Era: 15th International Conference, ICWE 2015, Rotterdam, The Netherlands, June 23-26, 2015, Proceedings / [ed] Philipp Cimiano, Flavius Frasincar, Geert-Jan Houben, and Daniel Schwabe, Springer, 2015, p. 583-598Conference paper (Refereed)
    Abstract [en]

    The advancements of web technologies in recent years made it possible to switch from traditional desktop software to online solutions. Today, people naturally use web applications to work together on documents, spreadsheets, or blogs in real time. Also interactive data visualizations are more and more shared in the web. They are thus easily accessible, and it is possible to collaboratively discuss and explore complex data sets. A still open problem in collaborative information visualization is the online exploration of node-link diagrams of graphs (or networks) in fields such as social sciences or systems biology. In this paper, we address challenges related to this research problem and present a client/server-based visualization system for the collaborative exploration of graphs. Our approach uses WebGL to render large graphs in a web application and provides tools to coordinate the analysis process of multiple users in synchronous as well as asynchronous sessions. 

  • 8961.
    Zimmer, Björn
    et al.
    Linnaeus University, Faculty of Technology, Department of computer science and media technology (CM), Department of Computer Science.
    Kerren, Andreas
    Linnaeus University, Faculty of Technology, Department of computer science and media technology (CM), Department of Computer Science.
    OnGraX: A Web-Based System for the Collaborative Visual Analysis of Graphs2017In: Journal of Graph Algorithms and Applications, ISSN 1526-1719, E-ISSN 1526-1719, Vol. 21, no 1, p. 5-27Article in journal (Refereed)
    Abstract [en]

    The visual analysis of complex networks is a challenging task in many fields, such as systems biology or social sciences. Often, various domain experts 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. We propose a new web-based visualization environment which supports distributed, synchronous and asynchronous collaboration. 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 are highlighted on demand by heat maps. They enable us to visualize user behavior data without affecting the original graph visualization, are robust against layout changes, and are user-sensitive in a sense that the current analyst is able to perceive which changes were made by others in asynchronous collaboration. In case of synchronous collaboration, an analyst can see where and what others are currently analyzing in the network visualization. Thus, our approach addresses critical collaborative visualization challenges, for instance, awareness and coordination of user activities or pointing to interesting objects. We evaluated the usability of the heat map approach against two alternatives in a controlled user experiment. In addition, the results of a domain expert review are described in this article.

  • 8962.
    Zimmer, Björn
    et al.
    Linnaeus University, Faculty of Technology, Department of Computer Science.
    Kerren, Andreas
    Linnaeus University, Faculty of Technology, Department of Computer Science.
    Sensemaking and Provenance in Distributed Collaborative Node-Link Visualizations2014Conference paper (Refereed)
    Abstract [en]

    Various experts often work together during the analysis of large and complex data sets in order to minimize the required time and to improve the quality of the analysis results. Keeping track of the reasoning involved during a collaborative process and using this information later to review and reflect upon it can be a challenging task. For instance, analysts should have the possibility to quickly review changes performed on a graph and get an idea of the most interesting regions according to the user history without the need to replay every single action that was performed by prior users. This paper focuses on challenges during the collection and visualization of the sensemaking process in distributed collaborative node-link visualizations. We raise five challenges that we think need discussion among researchers in this domain and present our tool OnGraX—a web-based collaborative tool for analyzing networks—that addresses some of those challenges.

  • 8963.
    Zimmer, Björn
    et al.
    Linnaeus University, Faculty of Technology, Department of computer science and media technology (CM), Department of Computer Science.
    Sahlgren, Magnus
    RISE SICS.
    Kerren, Andreas
    Linnaeus University, Faculty of Technology, Department of computer science and media technology (CM), Department of Computer Science.
    Visual Analysis of Relationships between Heterogeneous Networks and Texts: An Application on the IEEE VIS Publication Dataset2017In: Informatics, ISSN 2227-9709, Vol. 4, no 2, article id 11Article in journal (Refereed)
    Abstract [en]

    The visual exploration of large and complex network structures remains a challenge for many application fields. 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. In this work, we propose 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 the 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 our system, we use a large text corpus collected from research papers listed in the IEEE VIS publications dataset that consists of 2752 documents over a period of 25 years. Here, 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. 

  • 8964. Zimmermann, Wolf
    et al.
    Löwe, Welf
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Foundations for the integration of scheduling techniques into compilers for parallel languages2005In: International Journal of Computational Engineering Science, ISSN 1465-8763, E-ISSN 2047-6086, Vol. 1Article in journal (Refereed)
  • 8965. Zioutas, K.
    et al.
    Adiels, L.
    Backenstoss, G.
    Bergstrom, I.
    Carius, Staffan
    Charalambous, S.
    Findeisen, C.
    Fransson, K.
    Kerek, A.
    Pavlopoulos, P.
    Repond, J.
    Tauscher, L.
    Troster, D.
    Papadopoulou, Th.
    Tracas, N. D.
    Baryonium physics1983In: Proceedings of the 1st Hellenic School on Elementary Particle Physics / [ed] Papadopoulou, Th., Tracas, N.D., Institution of Electrical Engineers (IEE), 1983, p. 437-466Conference paper (Refereed)
    Abstract [en]

    Various theoretical ideas on nuclear physics, quark models, and the dual topological unitarization lead to the expectation of massive mesons, called baryonium, coupled strongly to the ppmacr channel but weakly to mesons, thus resulting in a virtually high stability, particularly below the ppmacr threshold. Such states are relevant to nuclear physics owing to the fact that the badly explored short-range forces in the NN interactions are just the most relevant ones in the NNmacr systems. From the known NN potential, one is led to expect short-range attraction in NNmacr systems, and this should result in quasinuclear bound states in the vicinity of threshold.

  • 8966.
    Zivanovic, Julia
    et al.
    Linnaeus University, Faculty of Technology, Department of Informatics.
    Mirzoyan, Mher
    Linnaeus University, Faculty of Technology, Department of Informatics.
    Betydelsefulla faktorer vid systeminförande: En fallstudie om förändringsfaktorer som påverkar användarmedverkan vid implementering av ett tidrapporteringssystem2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Termen användarmedverkan har funnits och arbetats med sedan 1960 talet.Användarmedverkan innebär att utvecklare och användare arbetar tillsammans för att ta framen så bra programvara som möjligt, där syftet är att man vill förenkla användarnas dagligaarbete (Preece et al, 2002). Denna rapport är en fallstudie som genomförts på ett fallföretaginom bemanningsbranschen, där implementering av ett nytt tidrapporteringssystem skett.Implementeringen upplevs ha lett till ett outtalat motstånd ifrån användarna av systemet.Syftet med studien var att undersöka hur implementeringen utav ett nytttidsrapporteringssystem mottagits av fallföretagets anställda konsulter, genom att belysa huranvändarmedverkan påverkat förändringsarbetet och vilka faktorer som bidragit till attanvändarna ställt sig negativa till förändringen i form av ett motstånd. Med erfarenheterdärifrån presentera förbättringsförslag inför kommande förändringsarbeten. Tidigare forskningvisar likmässiga genomförda studier inom stora organisationer, fast med inriktning på olikaförändringsarbeten och IT-system samt med fokus på högt uppskattade befattningar. Det nämnsäven i tidigare forskning att likmässiga studier bör genomföras för att stärka forskningen omså är möjligt. Det ansågs därför intressant att studera området utifrån ett annat perspektiv, inombemanningsbranschen med fokus på anställda konsulter.Teorier som användes för att uppnå syftet med studien var förändring i organisationer,kommunikationsplan, change management, technological acceptence model ochanvändarbarhet. Teorierna har använts som stöd i rapporten för att förklara och upplysarespektive problem som uppkommit utav implementeringen och påverkat de anställdakonsulternas användarmedverkan.Resultatet visade vara ett missnöje ifrån de anställda konsulternas perspektiv mot det nyasystemet, med många för och nackdelar som rörde hela förändringsarbetet på fallföretaget.Studien bidrog till framtagandet av olika betydelsefulla faktorer inom användarmedverkan sompåverkat implementeringen negativt. När resultatet ställdes mot forskningsfrågan och teorinvisade det sig att de upplevda faktorerna gick i linje med teorin.Genom att utvecklare och användare integrerar vid ett förändringsarbete, kan alla faktorer ochindivider involveras i projektet för att undvika missnöjet. Därmed skulle en implementeringkunna lyckas.

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  • 8967.
    Zoabi, Muhammad
    et al.
    Technion, Israel.
    Nadar-Ponniah, Prathamesh T.
    Technion, Israel.
    Khoury-Haddad, Hanan
    Technion, Israel.
    Ušaj, Marko
    Technion, Israel.
    Budowski-Tal, Inbal
    Technion, Israel.
    Haran, Tali
    Technion, Israel.
    Henn, Arnon
    Technion, Israel.
    Mandel-Gutfreund, Yael
    Technion, Israel.
    Ayoub, Nabieh
    Technion, Israel.
    RNA-dependent chromatin localization of KDM4D lysine demethylase promotes H3K9me3 demethylation2014In: Nucleic Acids Research, ISSN 0305-1048, E-ISSN 1362-4962, Vol. 42, no 21, p. 13026-13038Article in journal (Refereed)
    Abstract [en]

    The JmjC-containing lysine demethylase, KDM4D, demethylates di-and tri-methylation of histone H3 on lysine 9 (H3K9me3). How KDM4D is recruited to chromatin and recognizes its histone substrates remains unknown. Here, we show that KDM4D binds RNA independently of its demethylase activity. We mapped two non-canonical RNA binding domains: the first is within the N-terminal spanning amino acids 115 to 236, and the second is within the C-terminal spanning amino acids 348 to 523 of KDM4D. We also demonstrate that RNA interactions with KDM4D N-terminal region are critical for its association with chromatin and subsequently for demethylating H3K9me3 in cells. This study implicates, for the first time, RNA molecules in regulating the levels of H3K9 methylation by affecting KDM4D association with chromatin.

  • 8968. Zockler, Christoph
    et al.
    Miles, Lera
    Fish, Lucy
    Wolf, Annett
    Linnaeus University, The University Administration.
    Rees, Gareth
    Danks, Fiona
    Potential impact of climate change and reindeer density on tundra indicator species in the Barents Sea region2008In: Climatic Change, ISSN 0165-0009, E-ISSN 1573-1480, Vol. 87, no 1-2, p. 119-130Article in journal (Refereed)
    Abstract [en]

    Climate change is expected to alter the distribution of habitats and thus the distribution of species connected with these habitats in the terrestrial Barents Sea region. It was hypothesised that wild species connected with the tundra and open-land biome may be particularly at risk as forest area expands. Fourteen species of birds were identified as useful indicators for the biodiversity dependent upon this biome. By bringing together species distribution information with the LPJ-GUESS vegetation model, and with estimates of future wild and domestic reindeer density, potential impacts on these species between the present time and 2080 were assessed. Over this period there was a net loss of open land within the current breeding range of most bird species. Grazing reindeer were modelled as increasing the amount of open land retained for nine of the tundra bird species.

  • 8969. Zohari, Siamak
    et al.
    Gyarmati, P.
    Ejdersund, A.
    Berglöf, U.
    Thorén, P.
    Ehrenberg, M.
    Czifra, G.
    Belak, S.
    Waldenström, Jonas
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Olsen, Björn
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Berg, M.
    Phylogenetic analysis of the non-structural (NS) gene of influenza A viruses isolated from mallards in Northern Europe in 20052008In: Virology Journal, ISSN 1743-422X, E-ISSN 1743-422X, Vol. 5, no Article ID: 147Article in journal (Refereed)
    Abstract [en]

    Background: Although the important role of the non-structural 1 (NS) gene of influenza A in virulence of the virus is well established, our knowledge about the extent of variation in the NS gene pool of influenza A viruses in their natural reservoirs in Europe is incomplete. In this study we determined the subtypes and prevalence of influenza A viruses present in mallards in Northern Europe and further analysed the NS gene of these isolates in order to obtain a more detailed knowledge about the genetic variation of NS gene of influenza A virus in their natural hosts. Results: A total number of 45 influenza A viruses of different subtypes were studied. Eleven haemagglutinin-and nine neuraminidase subtypes in twelve combinations were found among the isolated viruses. Each NS gene reported here consisted of 890 nucleotides; there were no deletions or insertions. Phylogenetic analysis clearly shows that two distinct gene pools, corresponding to both NS allele A and B, were present at the same time in the same geographic location in the mallard populations in Northern Europe. A comparison of nucleotide sequences of isolated viruses revealed a substantial number of silent mutations, which results in high degree of homology in amino acid sequences. The degree of variation within the alleles is very low. In our study allele A viruses displays a maximum of 5% amino acid divergence while allele B viruses display only 2% amino acid divergence. All the viruses isolated from mallards in Northern Europe possessed the typical avian ESEV amino acid sequence at the C-terminal end of the NSI protein. Conclusion: Our finding indicates the existence of a large reservoir of different influenza A viruses in mallards population in Northern Europe. Although our phylogenetic analysis clearly shows that two distinct gene pools, corresponding to both NS allele A and B, were present in the mallards populations in Northern Europe, allele B viruses appear to be less common in natural host species than allele A, comprising only about 13% of the isolates sequenced in this study.

  • 8970. Zopf, David
    et al.
    Ohlson, Sten
    HyClone Laboratories, Inc., 1725 South State Highway 89-91, Logan, Utah 84321, USA.
    Weak-affinity Chromatography1990In: Nature, ISSN 0028-0836, E-ISSN 1476-4687, Vol. 346, p. 87-88Article in journal (Refereed)
    Abstract [en]

    Weak-affinity chromatography is a new method using readily reversible biospecific recognition as the basis for chromatographic separations. 

  • 8971. Zopf, David
    et al.
    Ohlson, Sten
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Dakour, J
    Wang, W T
    Lundblad, Arne
    Analysis and Purification of Oligosaccharides by High Performance Liquid Affinity Chromatography1989In: Methods in Enzymology, ISSN 0076-6879, E-ISSN 1557-7988, Vol. 179, p. 55-64Article in journal (Refereed)
  • 8972.
    Zou, Hanzheng
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Build an Inventory Tracking System2007Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis paper introduces you about the process of how to build an inventory tracking system in a local Swedish company. The related project is to support the thesis paper, and is also for the company’ using. The software product of this project is an application that works for managing various types’ instruments in the company of SWECO-Vaxjo. It will play an important role in the further management work of the company.

    In this thesis paper, the candidate techniques and theories for implementing this system are discussed. And in the end a good solution for this problem will be presented in the paper.

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  • 8973.
    Zubair, Ghaith
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    El-Thalji, Idriss
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    A model for analysis and design of an integrated operations management system using systems engineering approach: A case study2007Report (Other academic)
    Abstract [en]

    Background: Generally, operation management includes a set of complicated systems interfacing each other. Most important systems which impact and impacted by the operations management system are production management system and maintenance management system. But to treat the interfacing losses has been difficult as interact and partially overlap each other. In this study, case-operational system was treated with developed model that analysis and design integrated operational system in order to make it easier and cost effective to manage.

    Methods: A model was developed based on latest literature survey work using systems paradigm methodology and systems engineering approach.

    Results: Among five analysis techniques, four types of interfacing losses were identified, seven requirements were extracted, nine conceptual solutions were generated, one of them was selected and based on it the integrated operational management system were designed.

    Conclusions: The results suggest that the operational system in case-company shall be integrated by organization management, process management, and control management, in addition to data management.

  • 8974.
    Zucca, P.
    et al.
    ASTRON, Netherlands.
    Morosan, D. E.
    Trinity Coll Dublin, Ireland.
    Rouillard, A. P.
    Inst Rech Astrophys & Planetol, France.
    Fallows, R.
    ASTRON, Netherlands.
    Gallagher, P. T.
    Trinity Coll Dublin, Ireland.
    Magdalenic, J.
    Royal Observ Belgium, Belgium.
    Klein, K-L
    Observ Paris, France.
    Mann, G.
    Leibniz Inst Astrophys Potsdam AIP, Germany.
    Vocks, C.
    Leibniz Inst Astrophys Potsdam AIP, Germany.
    Carley, E. P.
    Trinity Coll Dublin, Ireland.
    Bisi, M. M.
    RAL Space, UK.
    Kontar, E. P.
    Univ Glasgow, UK.
    Rothkaehl, H.
    Polish Acad Sci, Poland.
    Dabrowski, B.
    Univ Warmia & Mazury, Poland.
    Krankowski, A.
    Univ Warmia & Mazury, Poland.
    Anderson, J.
    Helmholtz Zentrum Potsdam, Germany.
    Asgekar, A.
    ASTRON, Netherlands;Shell Technol Ctr, India.
    Bell, M. E.
    Univ Technol Sydney, Australia.
    Bentum, M. J.
    ASTRON, Netherlands;Eindhoven Univ Technol, Netherlands.
    Best, P.
    Univ Edinburgh, UK.
    Blaauw, R.
    ASTRON, Netherlands.
    Breitling, F.
    Leibniz Inst Astrophys Potsdam AIP, Germany.
    Broderick, J. W.
    ASTRON, Netherlands.
    Brouw, W. N.
    ASTRON, Netherlands;Kapteyn Astron Inst, Netherlands.
    Brueggen, M.
    Univ Hamburg, Germany.
    Butcher, H. R.
    Australian Natl Univ, Australia.
    Ciardi, B.
    Max Planck Inst Astrophys, Germany.
    de Geus, E.
    ASTRON, Netherlands;SmarterVision BV, Netherlands.
    Deller, A.
    ASTRON, Netherlands;Swinburne Univ Technol, Australia.
    Duscha, S.
    ASTRON, Netherlands.
    Eisloeffel, J.
    Thuringer Landessternwarte,Germany.
    Garrett, M. A.
    Univ Manchester, UK;Leiden Univ, Netherlands.
    Griessmeier, J. M.
    Univ Orleans, France;CNRS, France.
    Gunst, A. W.
    ASTRON, Netherlands.
    Heald, G.
    ASTRON, Netherlands;CSIRO Astron & Space Sci, Australia.
    Hoeft, M.
    Eindhoven Univ Technol, Netherlands.
    Horandel, J.
    Radboud Univ Nijmegen, Netherlands.
    Iacobelli, M.
    ASTRON, Netherlands.
    Juette, E.
    Ruhr Univ Bochum, Germany.
    Karastergiou, A.
    Univ Oxford, UK.
    van Leeuwen, J.
    Trinity Coll Dublin, Ireland;Univ Amsterdam, Netherlands.
    McKay-Bukowski, D.
    Univ Tromso, Norway;STFC Rutherford Appleton Lab, UK.
    Mulder, H.
    ASTRON, Netherlands.
    Munk, H.
    ASTRON, Netherlands;Radboud Univ Nijmegen, Netherlands.
    Nelles, A.
    Univ Calif Irvine, USA.
    Orru, E.
    ASTRON, Netherlands.
    Paas, H.
    Univ Groningen, Netherlands.
    Pandey, V. N.
    ASTRON, Netherlands;Observ Paris, France.
    Pekal, R.
    Poznan Supercomp & Networking Ctr PCSS, Poland.
    Pizzo, R.
    ASTRON, Netherlands.
    Polatidis, A. G.
    ASTRON, Netherlands.
    Reich, W.
    Max Planck Inst Radioastron, Germany.
    Rowlinson, A.
    ASTRON, Netherlands.
    Schwarz, D. J.
    Univ Bielefeld, Germany.
    Shulevski, A.
    Kapteyn Astron Inst, Netherlands.
    Sluman, J.
    ASTRON, Netherlands.
    Smirnov, O.
    Rhodes Univ, South Africa;SKA South Africa, South Africa.
    Sobey, C.
    Curtin Univ, Australia.
    Soida, M.
    Jagiellonian Univ, Poland.
    Thoudam, Satyendra
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Toribio, M. C.
    ASTRON, Netherlands;Kapteyn Astron Inst, Netherlands.
    Vermeulen, R.
    ASTRON, Netherlands.
    van Weeren, R. J.
    Kapteyn Astron Inst, Netherlands.
    Wucknitz, O.
    Max Planck Inst Radioastron, Germany.
    Zarka, P.
    Observ Paris, France.
    Shock location and CME 3D reconstruction of a solar type II radio burst with LOFAR2018In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 615, article id A89Article in journal (Refereed)
    Abstract [en]

    Context. Type II radio bursts are evidence of shocks in the solar atmosphere and inner heliosphere that emit radio waves ranging from sub-meter to kilometer lengths. These shocks may be associated with coronal mass ejections (CMEs) and reach speeds higher than the local magnetosonic speed. Radio imaging of decameter wavelengths (20-90 MHz) is now possible with the Low Frequency Array (LOFAR), opening a new radio window in which to study coronal shocks that leave the inner solar corona and enter the interplanetary medium and to understand their association with CMEs. Aims. To this end, we study a coronal shock associated with a CME and type II radio burst to determine the locations at which the radio emission is generated, and we investigate the origin of the band-splitting phenomenon. Methods. The type II shock source-positions and spectra were obtained using 91 simultaneous tied-array beams of LOFAR, and the CME was observed by the Large Angle and Spectrometric Coronagraph (LASCO) on board the Solar and Heliospheric Observatory (SOHO) and by the COR2A coronagraph of the SECCHI instruments on board the Solar Terrestrial Relation Observatory (STEREO). The 3D structure was inferred using triangulation of the coronographic observations. Coronal magnetic fields were obtained from a 3D magnetohydrodynamics (MHD) polytropic model using the photospheric fields measured by the Heliospheric Imager (HMI) on board the Solar Dynamic Observatory (SDO) as lower boundary. Results. The type II radio source of the coronal shock observed between 50 and 70 MHz was found to be located at the expanding flank of the CME, where the shock geometry is quasi-perpendicular with theta(Bn)similar to 70 degrees. The type II radio burst showed first and second harmonic emission; the second harmonic source was cospatial with the first harmonic source to within the observational uncertainty. This suggests that radio wave propagation does not alter the apparent location of the harmonic source. The sources of the two split bands were also found to be cospatial within the observational uncertainty, in agreement with the interpretation that split bands are simultaneous radio emission from upstream and downstream of the shock front. The fast magnetosonic Mach number derived from this interpretation was found to lie in the range 1.3-1.5. The fast magnetosonic Mach numbers derived from modelling the CME and the coronal magnetic field around the type II source were found to lie in the range 1.4-1.6.

  • 8975.
    Zukas, Paulius
    Linnaeus University, Faculty of Technology, Department of computer science and media technology (CM).
    Raising Awareness of Computer Vision: How can a single purpose focused CV solution be improved?2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The concept of Computer Vision is not new or fresh. On contrary ideas have been shared and worked on for almost 60 years. Many use cases have been found throughout the years and various systems developed, but there is always a place for improvement. An observation was made, that methods used today are generally focused on a single purpose and implement expensive technology, which could be improved. In this report, we are going to go through an extensive research to find out if a professionally sold, expensive software, can be replaced by an off the shelf, low-cost solution entirely designed and developed in-house. To do that we are going to look at the history of Computer Vision, examples of applications, algorithms, and find general scenarios or computer vision problems which can be solved. We are then going take a step further and define solid use cases for each of the scenarios found. Finally, a prototype solution is going to be designed and presented. After analysing the results gathered we are going to reach out to the reader convincing him/her that such application can be developed and work efficiently in various areas saving investments to businesses.

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  • 8976.
    Zuniga, Silvia
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Bat species richness and activity in forest habitats close to lakes versus far from lakes,  in Sweden2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The long-term effects of large-scale changes in forestry, agriculture and other land use on habitats and the large-scale expansion of wind farming  affects bats foraging environments. In order to predict consequences of exploitations on local bat species and populations, good surveys are important. To get good background information for an Environmental Impact Assessment (EIA) it  is crucial to rapidly assess which areas are most important for bats. The aim of this work was to measure the importance of the two types of forest environment for bats foraging : forest areas located close to or far from the lakes. Bat activity and species diversity was measured with automatic ultrasound recorders in 211  nights of fieldwork at 155 locations in 23 areas in different parts of Sweden during June, July and the first two weeks of August 2011 and 2012. A total of 11 species were recorded in forest far from lakes and 8 species in forest close to lakes. Eptesicus nilssonii , Myotis sp. and Pipistrellus pygmaeus were the most common taxa in both habitat types. Activity levels were higher in the vicinity of lakes compared to forests far away from lakes. Species diversity calculated on base on Chao 2 was similar for both types of habitats . The results suggest that the forests close to lakes are the most important habitats to surveys for bats in Sweden and that inventory efforts should be primarily invested in them.

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  • 8977.
    Zunkovic, Michelle
    Linnaeus University, Faculty of Technology, Department of Mathematics.
    A Brief Overveiw of Outer Billiards on Polygons2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
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  • 8978.
    Zuo, Xingdong
    Linnaeus University, Faculty of Technology, Department of Mathematics.
    Derivation of the Lindblad Equation for Open Quantum Systems and Its Application to Mathematical  Modeling of the Process of Decision Making2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In the theory of open quantum systems, a quantum Markovian master equation, the Lindblad equation, reveals the most general form for the generators of a quantum dynamical semigroup. In this thesis, we present the derivation of the Lindblad equation and several examples of Lindblad equations with their analytic and numerical solutions. The graphs of the numerical solutions illuminate the dynamics and the stabilization as time increases. The corresponding von Neumann entropies are also presented as graphs. Moreover, to illustrate the difference between the dynamics of open and isolated systems, we prove two theorems about the conditions for stabilization of the solutions of the von Neumann equation which describes the dynamics of the density matrix of open quantum systems. It shows that the von Neumann equation is not satisfied for modelling dynamics in the cognitive contextin general. Instead, we use the Lindblad equation to model the mental dynamics of the players in the game of the 2-player prisoner’s dilemma to explain the irrational behaviors of the players. The stabilizing solution will lead the mental dynamics to an equilibrium state, which is regarded as the termination of the comparison process for a decision maker. The resulting pure strategy is selected probabilistically by performing a quantum measurement. We also discuss two important concepts, quantum decoherence and quantum Darwinism. Finally, we mention a classical Neural Network Master Equation introduced by Cowan and plan our further works on an analogous version for the quantum neural network by using the Lindblad equation.

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  • 8979.
    Zverev, Vitali
    et al.
    University of Turku, Finland.
    Kozlov, Mikhail
    University of Turku, Finland.
    Forsman, Anders
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Zvereva, Elena
    University fo Turku, Finland.
    Ambient temperatures differently influence colour morphs of the leaf beetle Chrysomela lapponica: roles of thermal melanism and developmental plasticity2018In: Journal of Thermal Biology, ISSN 0306-4565, E-ISSN 1879-0992, Vol. 74, p. 100-109Article in journal (Refereed)
    Abstract [en]

    We asked whether ambient temperatures can affect morph frequencies within a subarctic population of thepolymorphic leaf beetle Chrysomela lapponica through thermal melanism and/or developmental plasticity. Bodytemperature increased faster in beetles of dark morph than in beetles of light morph under exposure to artificialirradiation. Dark males ran faster than light males in both field and laboratory experiments, and this differencedecreased with increasing ambient air temperature, from significant at 10 °C to non-significant at 20 °C and26 °C. On cold days (6–14 °C), significantly more dark males than light males were found on their host plants incopula (40.8% and 27.3% respectively); on warm days (15–22 °C) this difference disappeared. Light femalesproduced twice as many eggs as dark females; this difference did not depend on the ambient temperature. Theproportion of dark morphs in the progenies of pairs with one dark parent was twice as high as that in theprogenies of pairs in which both parents were light, and this proportion was greater when larvae developed atlow (10 and 15 °C) than at high (20 and 25 °C) temperatures. We conclude that low temperatures may increasethe frequencies of dark morphs in C. lapponica populations due to both the mating advantages of dark males overlight males and developmental plasticity. Variation in frequencies of low-fecund dark morphs in the population,caused by among-year differences in temperature together with density-dependent selection, may contribute tothe evolutionary dynamics of the colour polymorphism and may influence abundance fluctuations in these leafbeetle populations.

  • 8980.
    Zvereva, Elena L.
    et al.
    Univ Turku, Finland.
    Castagneyrol, Bastien
    Univ Bordeaux, France.
    Cornelissen, Tatiana
    Univ Fed Minas Gerais, Brazil.
    Forsman, Anders
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Hernandez-Agueero, Juan Antonio
    Univ Rey Juan Carlos, Spain.
    Klemola, Tero
    Univ Turku, Finland.
    Paolucci, Lucas
    Univ Fed Lavras, Brazil;Inst Pesquisa Ambiental Amazonia, Brazil.;Univ Fed Vicosa, Brazil.
    Polo, Vicente
    Univ Rey Juan Carlos, Spain.
    Salinas, Norma
    Pontificia Univ Catolica Peru, Peru.
    Theron, Kasselman Jurie
    Stellenbosch Univ, South Africa.
    Xu, Guorui
    Chinese Acad Sci, China.
    Zverev, Vitali
    Univ Turku, Finland.
    Kozlov, Mikhail V.
    Univ Turku, Finland.
    Opposite latitudinal patterns for bird and arthropod predation revealed in experiments with differently colored artificial prey2019In: Ecology and Evolution, ISSN 2045-7758, E-ISSN 2045-7758, Vol. 9, no 24, p. 14273-14285Article in journal (Refereed)
    Abstract [en]

    The strength of biotic interactions is generally thought to increase toward the equator, but support for this hypothesis is contradictory. We explored whether predator attacks on artificial prey of eight different colors vary among climates and whether this variation affects the detection of latitudinal patterns in predation. Bird attack rates negatively correlated with model luminance in cold and temperate environments, but not in tropical environments. Bird predation on black and on white (extremes in luminance) models demonstrated different latitudinal patterns, presumably due to differences in prey conspicuousness between habitats with different light regimes. When attacks on models of all colors were combined, arthropod predation decreased, whereas bird predation increased with increasing latitude. We conclude that selection for prey coloration may vary geographically and according to predator identity, and that the importance of different predators may show contrasting patterns, thus weakening the overall latitudinal trend in top-down control of herbivorous insects.

  • 8981. Zvyagilskaya, Renata
    et al.
    Lundh, Fredrik
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Samyn, Dieter R.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Granberg, Johanna
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Mouillon, Jean-Marie
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Popova, Yulia
    Thevelein, Johan
    Persson, Bengt L.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Characterization of the Pho89 phosphate transporter by functional hyperexpression in Saccharomyces cerevisiae.2008In: FEMS yeast research (Print), ISSN 1567-1356, E-ISSN 1567-1364, Vol. 8, no 5, p. 685-696Article in journal (Refereed)
  • 8982. Zweifel, Ulla Li
    et al.
    Hagström, Åke
    Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences.
    Holmfeldt, Karin
    Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences.
    Thyrhaug, Runar
    Geels, Camilla
    Frohn, Lise Marie
    Skjoth, Carsten A.
    Karlson, Ulrich Gosewinkel
    High bacterial 16S rRNA gene diversity above the atmospheric boundary layer2012In: Aerobiologia, ISSN 0393-5965, E-ISSN 1573-3025, Vol. 28, no 4, p. 481-498Article in journal (Refereed)
    Abstract [en]

    The atmosphere is host to an omnipresent bacterial community that may influence fundamental atmospheric processes such as cloud formation and precipitation onset. Knowledge of this bacterial community is scarce, particularly in air masses relevant to cloud formation. Using a light aircraft, we sampled above the atmospheric boundary layer-that is, at heights at which cloud condensation occurs-over coastal areas of Sweden and Denmark in summer 2009. Enumeration indicated total bacterial numbers of 4 x 10(1) to 1.8 x 10(3) m(-3) air and colony-forming units of 0-6 bacteria m(-3) air. 16S rRNA gene libraries constructed from samples collected above the Baltic Sea coast revealed a highly diverse bacterial community dominated by species belonging to the genera Sphingomonas and Pseudomonas. Bacterial species known to carry ice-nucleating proteins were found in several samples. Modeled back trajectories suggested the potential sources of the sampled bacteria to be diverse geographic regions, including both marine and terrestrial environments in the northern hemisphere. Several samples contained 16S rRNA genes from plant chloroplasts, confirming a terrestrial contribution to these samples. Interestingly, the airborne bacterial community displayed an apparent seasonal succession that we tentatively ascribe to in situ succession in the atmosphere.

  • 8983.
    Zöttl, Markus
    et al.
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. Univ Cambridge, UK.
    Vullioud, Philippe
    Univ Cambridge, UK.
    Goddard, Katy
    Kuruman River Reserve, South Africa.
    Torrents-Tico, Miquel
    Kuruman River Reserve, South Africa;Univ Helsinki, Finland.
    Gaynor, David
    Univ Pretoria, South Africa.
    Bennett, Nigel C.
    Univ Pretoria, South Africa.
    Clutton-Brock, Tim
    Univ Cambridge, UK;Univ Pretoria, South Africa.
    Allo-parental care in Damaraland mole-rats is female biased and age dependent, though independent of testosterone levels2018In: Physiology and Behavior, ISSN 0031-9384, E-ISSN 1873-507X, Vol. 193, p. 149-153Article in journal (Refereed)
    Abstract [en]

    In Damaraland mole-rats (Fukomys damal-ensis), non-breeding subordinates contribute to the care of offspring born to the breeding pair in their group by carrying and retrieving young to the nest. In social mole-rats and some cooperative breeders, dominant females show unusually high testosterone levels and it has been suggested that high testosterone levels may increase reproductive and aggressive behavior and reduce investment in allo-parental and parental care, generating age and state-dependent variation in behavior. Here we show that, in Damaraland mole-rats, allo-parental care in males and females is unaffected by experimental increases in testosterone levels. Pup carrying decreases with age of the non-breeding helper while the change in social status from non-breeder to breeder has contrasting effects in the two sexes. Female breeders were more likely than female non-breeders to carry pups but male breeders were less likely to carry pups than male non-breeders, increasing the sex bias in parental care compared to allo-parental care. Our results indicate that testosterone is unlikely to be an important regulator of allo-parental care in mole-rats.

  • 8984.
    Ågren, Alicia
    et al.
    Linnaeus University, Faculty of Technology, Department of Mathematics.
    Ödlund, Matilda
    Linnaeus University, Faculty of Technology, Department of Mathematics.
    Likhetstecknets betydelse för lågstadiets elever: En systematisk litteraturstudie av vanliga missuppfattningar hos elever på lågstadiet2020Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    I denna systematiska litteraturstudie är elevers förståelse för likhetstecknets betydelse i fokus. Syftet med denna studie är att undersöka vilka missuppfattningar forskning har identifierat att elever på lågstadiet kan ha gällande likhetstecknets betydelse, samt hur lärarna i undervisningen kan förebygga och möta dessa missuppfattningar. Studien utgår ifrån två forskningsfrågor som lyder: Vilka missuppfattningar kan finnas hos elever på lågstadiet gällande förståelsen av likhetstecknet? Hur kan matematikundervisningen på lågstadiet utformas för att förebygga och möta sådana missuppfattningar? Sammanlagt har sju vetenskapliga artiklar och två doktorsavhandlingar analyserats. Samtliga har identifierats genom sökning i databaserna SwePub, ERIC och One Search. Utifrån att ha granskat den litteratur som har valts ut i denna systematiska litteraturstudie har det sociokulturella perspektivet, konstruktivistiska perspektivet samt variationsteorin synliggjorts. Resultatet av analysen visar på att elever kan ha svårigheter med att förstå den relationella tolkningen av likhetstecknet, det vill säga att de saknar en kunskap om att likhetstecknet som symbol indikerar lika stort värde på båda sidorna av symbolen. Elever ser istället likhetstecknet endast som en operationell symbol, vilket gör att de uppfattar tecknet som en uppmaning om att skriva svaret. Resultatet visar även vikten av att i undervisningen återkoppla och kontinuerligt repetera likhetstecknets relationella innebörd, då detta påverkar elevers förståelse för matematik överlag.

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    Arbete 4_Kalmar_Exa
  • 8985.
    Ågren, Emanuel
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Myhrberg, Per
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Elever som visar på matematiksvårigheter: Identifiering, orsaker och arbetsmetoder utifrån ett specialpedagogiskt perspektiv2008Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Examensarbetets syfte är att undersöka hur skolan identifierar och hur speciallärare ser på orsaker till matematiksvårigheter, samt hur speciallärare arbetar med elever som visar på matematiksvårigheter under de senare åren. Under tredje frågeställningen ställs även frågan om vad speciallärare anser om integrerad samt segregerad undervisningsform. De kvalitativa intervjuerna genomfördes på speciallärarnas arbetsplats efter deras önskemål. Intervjuerna genomfördes med sex olika speciallärare, varav tre stycken har speciallärarexamen och tre stycken har bara lärarexamen men jobbar som speciallärare, på grundskolor i Växjö kommun, Ljungby kommun och Värnamo kommun.

    Undersökningen visar att identifieringen av elever som visar på matematiksvårigheter sker huvudsakligen genom diagnoser men också genom den ordinarie lärarens observationer i klassrummet. De flesta av speciallärarna anser att dåligt självförtroende är en stor bidragande orsak till elevers matematiksvårigheter, men även att elever med läs och skrivsvårigheter får svårigheter i matematik.

    Vidare framgår det av intervjuerna att arbetet med elever som visar på matematiksvårigheter alltid börjar med en ordentlig kartläggning av orsakerna till elevens matematiksvårigheter. Kartläggningen sker genom olika former av diagnoser samt observationer där man tar reda på vad eleven behärskar och vad det är som brister.

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  • 8986.
    Åkerblom, Daniel
    et al.
    Linnaeus University, Faculty of Health and Life Sciences, Department of Chemistry and Biomedical Sciences.
    Lindahl, Mats
    Linnaeus University, Faculty of Health and Life Sciences, Department of Chemistry and Biomedical Sciences.
    Authenticity and the relevance of discourse and figured worlds in secondary students' discussions of socioscientific issues2017In: Teaching and Teacher Education: An International Journal of Research and Studies, ISSN 0742-051X, E-ISSN 1879-2480, Vol. 65, p. 205-214Article in journal (Refereed)
    Abstract [en]

    The purpose of this paper is to examine how authenticity influences students' discussions of socio-scientific issues (SSI). The students were found to bridge school knowledge and everyday knowledge, i.e. enter a "third space", in their explorative discussions. When the SSI task changed into a decision-making discussion for communication with an authentic stakeholder, the students excluded many perspectives. In the process, authenticity caused a loss of relevance for one discourse and several figured worlds, including the students' emotional reasoning. While losing emotional aspects, students' reasoning became more precise when grounded in rational reasoning, supporting well-informed decisions.

  • 8987.
    Åkerblom, Pontus
    et al.
    Linnaeus University, Faculty of Technology, Department of Informatics.
    Nilsson, Joacim
    Linnaeus University, Faculty of Technology, Department of Informatics.
    Knowledge Management Systems Issues Within Organizations2017Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The aim of this study is to locate if there are some common problems connected to knowledge management systems (KMSs) within organizations. This thesis begins with an introduction to knowledge management (KM) and knowledge management systems, followed by a presentation of previous research in the field of KM problematics. To find these possible issues that may prevent an effective use of KMSs within organizations, we will study contemporary literature and perform some complementary interviews. The questions formulated are addressed to participants from the organization Tieto, at their office in Lund. The questions are kept to a restricted number to gather replies that collect the main answers of relevance. The results from the literature review are then compared to the interviews. The main conclusion of this study is that the organizational culture may affect the possible occurrence of KMSs that suffer from usability problems, which causes the knowledge sharing to be inadequate. Finally; a picture of the problem areas concerning KMSs within organizations arise and some resolutions along with recommendations are presented.

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  • 8988.
    Åkerlund, Rasmus
    Linnaeus University, Faculty of Technology, Department of computer science and media technology (CM).
    Real-time localization of balls and hands in videos of juggling using a convolutional neural network2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Juggling can be both a recreational activity that provides a wide variety of challenges to participants and an art form that can be performed on stage. Non-learning-based computer vision techniques, depth sensors, and accelerometers have been used in the past to augment these activities. These solutions either require specialized hardware or only work in a very limited set of environments. In this project, a 54 000 frame large video dataset of annotated juggling was created and a convolutional neural network was successfully trained that could locate the balls and hands with high accuracy in a variety of environments. The network was sufficiently light-weight to provide real-time inference on CPUs. In addition, the locations of the balls and hands were recorded for thirty-six common juggling pattern, and small neural networks were trained that could categorize them almost perfectly. By building on the publicly available code, models and datasets that this project has produced jugglers will be able to create interactive juggling games for beginners and novel audio-visual enhancements for live performances.

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  • 8989.
    Åkesson, AnnaCarin
    et al.
    Linnaeus University, Faculty of Technology, Department of Mathematics Education.
    Rudberg, Sara
    Linnaeus University, Faculty of Technology, Department of Mathematics Education.
    Teaching and learning mathematics in India2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Our three months in India included a field study of different perspectives on learning the subject of mathematics. The chosen perspectives were;

    the behaviouristic perspective, the cognitive perspective, the pragmatic perspective and the socio-cultural perspective. The study was implemented with teachers and students at a public school in the state of Kerala, which is situated in the southernmost part of the country. They participated in our observations, interviews and teaching experiments. We sought to ascertain which of the four chosen learning perspectives the faculty and students at the host school use for educating. Our conclusion is that the observed teaching methods had influences from all four chosen perspectives, some more than others.

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    Teaching and learning mathematics in India
  • 8990.
    Åkesson, Christine
    et al.
    Lund University.
    Nielsen, Anne Birgitte
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. Lund University.
    Broström, Anna
    Swedish National Heritage Board.
    Persson, Thomas
    Lund University.
    Gaillard, Marie-José
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Berglund, Björn E.
    Lund University.
    From landscape description to quantification: A new generation of reconstructions provides new perspectives on Holocene regional landscapes of SE Sweden2015In: The Holocene, ISSN 0959-6836, E-ISSN 1477-0911, Vol. 25, no 1, p. 178-193Article, review/survey (Refereed)
    Abstract [en]

    The development since the beginning of the 20th century of the pollen-analytical theory and method as a palaeoecological tool for describing landscape development is outlined with reference to southern Scandinavia. Numerical methods applied since the 1980s are discussed. The aim of this paper is to provide a new perspective on the landscape development and human impact during the Holocene by applying the Regional Estimates of VEgetation Abundance from Large Sites (REVEALS) model to the pollen records from the reference site Lake Farskesjon in SE Sweden. The model was applied both to a previously published record (core 1956, entire Holocene until ad 1600) and a newly collected dataset (core 2013, the last 3000years). The comparison between the REVEALS estimates of vegetation cover and historical landscape maps indicate that traditional, uncorrected pollen percentages significantly underestimate the degree of landscape openness created by long-term farming and pasturing, but that the degree of underestimation varies over time, depending on the species composition of both the forest and the open-land communities. The REVEALS reconstructions are also a useful tool for the quantification of past land-use changes that may have affected the nutrient loading to the Baltic Sea.

  • 8991.
    Åkesson, Marie-Louise
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Håkansson Engberg, Johanna
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Vardagsmatematik med barn i åldern 1-3 år: En studie om och hur pedagoger tar tillvara på och arbetar med vardagsmatematiken och hur de synliggör den för barnen.2007Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Syftet med arbetet är att se om pedagoger i Tingsryds kommun arbetar med vardagsmatematiken och om de synliggör den för barnen. Vi har valt att avgränsa oss till pedagoger som arbetar med barn i åldrarna 1-3 år. Arbetet är tänkt att inspirera pedagoger till att ta till vara på den vardagsmatematik som finns och även reflektera över hur de kan synliggöra den i olika aktiviteter för barnen. I litteraturgenomgången ges en historisk genomgång av matematik i förskolan. Här presenteras även vardagsmatematiken i förskolan som är den form av matematik som små barn kommer i kontakt med och använder under en dag på förskolan. Vi har tagit hjälp av enkäter och observationer för att få svar på hur pedagoger arbetar med vardagsmatematik och hur de synliggör den för barnen. Situationerna som observerats är de två aktiviteter som flest pedagoger uppgett i enkäten att de använder och synliggör vardagsmatematik i för barnen. Genom enkätundersökning och observationer har vi blivit medvetna om att pedagogerna ofta använder sig av vardagsmatematik under dagen på förskolan men att de har svårt att synliggöra den för barnen.

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    FULLTEXT01
  • 8992.
    Åkesson Nilsson, Gunilla
    Växjö University, Faculty of Humanities and Social Sciences, School of Education.
    Enkla och positiva inslag i kemiundervisningen i grundskolans tidigare år2008Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Society at large has a growing demand for a population, well educated in natural sciences. Despite this, young people’s knowledge and interest of natural science has decreased over the last 10 years. Research in educational sciences often results in suggestions of improvement of, for example, teaching strategies and the consensus teaching models in use. One area that has received less attention by scientist is the practical work done by teachers on an every day basis. The purpose of this study is to attempt to find simple and good examples of the everyday practical teaching, used to reach the educational targets goals in chemistry for year five in lower level of compulsory school. Hopefully, the results can be used to encourage more teachers to address chemistry in lower level of compulsory school. Data was collected by interviews.

    By using flexible teaching, were the pupils’ interest and abilities were in focus, the teachers included in this study was able to reach the educational targets goals. The pupils’ work was characterized by simple experiments and discussions of what could happen, and why it happened. The fundamental scientific procedures, of documentation, observations, discussions and reflection were used by the pupils during their experimental work, a process of importance for training in practical methods and logical thinking. This may be fundamental for providing pupils with frames for abstract thinking. Even if teachers can not provide correct answers or in-depth explanations, it is important that they give pupils the opportunity to explore chemical concepts in a logical manner.

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    FULLTEXT01
  • 8993.
    Åkesson, Peter
    University of Kalmar, School of Communication and Design.
    Bandesign för Multiplayerspel2009Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Denna rapport är en undersökning om hur man gör en bana i ett FPS-spel så att banan blirintressant och rolig så att så många spelare som möjligt vill spela den. För att komma framtill det har jag skapat en bana i Hammer till spelet Team Fortress 2 för att göra vissa testerpå den för att därigenom komma fram till mitt resultat.

    Slutligen kom jag fram till att det viktigaste när man skapar en bana är variation och att hamed något som passar alla. Dessutom kan det ha en viss vikt hur banan ser ut annarskommer folk inte ens testa banan.

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    FULLTEXT01
  • 8994.
    Åknert, Elin
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Svensson, Malin
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Matematikkunskaper ur ett genusperspektiv2006Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Syftet med denna undersökning är att se om det finns några skillnader mellan pojkars och flickors matematikkunskaper i år 5 samt hur lärare uppfattar könsskillnader inom matematiken. Med hjälp av observationer av det nationella ämnesprovet i matematik i år 5 från 2002 och intervjuer med verksamma matematiklärare, ville vi ta reda på om det fanns några könsskillnader i matematikområdena mätning och rumsuppfattning och textuppgifter. Även att få lärares perspektiv på könsskillnader i dessa matematikområden och ett socialt perspektiv på matematikkunskaper. I denna undersökning har en kvalitativ metod använts.

    Observationsresultaten av undersökningen visar att det inte finns någon skillnad mellan könen i området mätning och rumsuppfattning, men en viss skillnad finns till flickornas fördel i textuppgifter. Intervjuerna gav samma resultat som observationerna vad gäller de utvalda matematikområdena. De ger även en bild av hur lärare bemöter de olika könen och vad som kan vara orsakerna till likheter och skillnader inom matematiken t.ex. föräldrarnas påverkan och självskattning. Denna undersökning är avsedd till att väcka intresse och göra blivande och verksamma lärare observanta på eventuella könsskillnader inom matematiken.

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  • 8995.
    Ålkärr, Linus
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Studies on skin microbiota and growth of Northern pike (Esox lucius) larvae from a translocation experiment in two Swedish wetlands2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Pike (Esox lucius) larvae from a translocation experiment conducted in two wetlands connected to Lerviksbäcken and Oknebäcken were used to study larval skin microbiomes and growth of individuals from two reproductively isolated populations of anadromous Baltic Sea pike. Microbial communities were investigated by amplifying and sequencing the 16S rRNA gene from DNA extracts of mucus swabs. The purpose of this study was to explore the larval skin associated microbiota to look for signs of divergence between populations and families in host mechanisms that influence microbial adhesion to skin mucosa. Principal coordinates analyses and PERMANOVA of microbiome data, as well as studies of alpha diversity and taxonomic composition, showed that the communities on larval skin were distinct from and more diverse than those in the surrounding water. However, the two populations did not exhibit any significant differences in microbiomes, and an apparent effect of genetic distance on microbiome characteristics could be due to cross contamination. Measurements of body length indicated that while the two populations did not differ in length at the end of the yolk sac stage, rearing site had an effect on body length as individuals reared in the Oknebäck wetland were significantly longer than those reared in the Lervik wetland.

  • 8996.
    Åman, Isabelle
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Störningar i ledarhundens arbete: Orsak och konsekvenser2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Aggression is a common behavior among many species and can be signaled through both vocalization and visual signals. The behavior may be based on dominance, competition for a partner or because the individual defends a resource or a territory. Around 15 000 years ago the wolf Canis lupus was domesticated, which resulted in the subspecies dog Canis familiaris and through an extensive breeding program there are currently over 400 recognized breeds. In Sweden there are about 300 active guide dogs in service and every year around 40 new dogs are trained, that will come to work for a guide dog owner. The aim of this study was to see to which frequency and in what way guide dogs for the visually impaired are disturbed when they are on duty out in public places. In order to collect data a survey was conducted, where 18 guide dog owners described one to two typical situations of disturbance from other dogs, which occurs when the guide dog are on duty. Nearly 90 percent of the guide dog owners reported that one or more disturbance had occurred, where lunges was the most common type of disturbance followed by active play and attack. The majority of the affected guide dogs in this study were males of the breed Labrador retriever. Several of the guide dogs got mental and/or physical injuries due to the disturbance and had to be taken out of duty temporarily. The attacks may have been based on a lack of communication between the dogs. The results are based on a limited sample, therefore they may not be representative of the situation for the entire Swedish guide dog population but it is possible to sense a problem. This study is the first of its kind to be carried out in Sweden and leaves room for further research. 

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  • 8997.
    Åman, Sandra
    Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences.
    Stabila bakfyllningar2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Fyllning i kakor (s.k. bakfyllning) kan under bakning och särskilt under lagring ge negativa effekter så som migrering av fyllning och olja ut i kakdegen. Valet av fettsystem i fyllningen och dess smältpunkt är av stor betydelse för att erhålla önskvärd konsistens och textur. Syftet med examensarbetet var att minimera dessa negativa effekter samt att kartlägga faktorer som påverkar detta. Tidigare bakförsök vid AarhusKarlshamn har visat att fyllningens partikelstorlek påverkar migreringen, då migreringen tycks öka med ökande partikelstorlek. Examensarbetet innefattade provbakningar, fysikaliska analyser och sensoriska test. Baktemperatur och avsvalningshastigheten varierades. Kakdegens socker varierades med strö- och florsocker för att ge olika porositet. Fyllningarna baserades på tre olika fettsystem; A, B och B:C. Fettsystem B gav dock fyllningen för lös konsistens och uteslöts senare ur studien. Fyllningarnas normala (N) partikelstorlek var 50 μm och fyllning baserad på A valsades för att reducera partikelstorleken till 10, 20 respektive 40 μm, vilka namngavs A(10), A(20) respektive A(40). Oljemigrering studerades efter 3 dagar och 2,5 veckor genom sensorisk utvärdering och texturanalys. Differential scanning calorimetry och reologi användes för att studera fyllningens fysikaliska egenskaper. Ingen signifikant skillnad i textur kunde påvisas med olika socker i kakdegen eller med de olika använda baktemperaturerna (160 resp. 190 °C). Den sensoriska och visuella utvärderingen visade att för kakor med fyllning A(N) och A(40) gav mest oljemigrering. Detta styrktes med resultat från texturanalysen. Smältpunkten för fyllning baserad på A bestämdes till ~48,4 °C och fyllning baserad på B:C till 60,6 °C. Partikelstorlek visades således ha inverkan på oljemigreringen och en partikelstorlek ≤ 20 μm är nödvändig för att fyllningen ska vara stabil, dvs. ingen migrering av fyllning och olja.

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    Stabila bakfyllningar
  • 8998.
    Åqvist, Johan
    et al.
    Uppsala University.
    Wennerström, Petra
    Uppsala University.
    Nervall, Martin
    Uppsala University.
    Bjelic, Sinisa
    Uppsala University.
    Brandsdal, Bjørn O.
    Uppsala University.
    Molecular dynamics simulations of water and biomolecules wit a Monte Carlo constant pressure algorithm2004In: Chemical Physics Letters, ISSN 0009-2614, E-ISSN 1873-4448, Vol. 384, no 4-6, p. 288-294Article in journal (Refereed)
    Abstract [en]

    A mixed molecular dynamics/Monte Carlo (MD/MC) algorithm for constant pressure simulations of arbitrary molecular systems is examined. Calculations are reported at ambient and high pressures both for liquid water systems and for a chemical reaction step in a solvated enzyme utilizing empirical valence bond potentials. The present method reproduces earlier reported results well and is computationally efficient since it does not require the virial to be evaluated at each MD step. It is also found that the effects of introducing MC volume steps on the dynamics of the system are negligible provided that the volume step sizes and updating frequencies are appropriately chosen.

  • 8999.
    Åström, Mats
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Environmental Science - Characteristics, environmental loading and remedial measures of boreal acid sulphate soils – Preface2005In: Agricultural and food science, Vol. 14 (1), p. 3-4Article in journal (Other academic)
  • 9000.
    Åström, Mats E.
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences.
    Nystrand, Miriam
    Gustafsson, Jon-Petter
    Österholm, Peter
    Nordmyr, Linda
    Reynolds, Jason
    Peltola, Pasi
    Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences.
    Lanthanoid behaviour in an acidic landscape2010In: Geochimica et Cosmochimica Acta, ISSN 0016-7037, E-ISSN 1872-9533, Vol. 74, no 3, p. 829-845Article in journal (Refereed)
    Abstract [en]

    Lanthanoids were studied in a boreal landscape where an abundance of acid sulfate soils and Histosols provide a unique opportunity to increase the understanding of flow these metals behave in acidic soils and waters and interact with soil and aqueous organic matter. In the acid sulfate soils lanthanoids are mobile as reflected in high to very high concentrations in soil water and runoff (typically a few mg 1(-1) but Lip to 12 mg 1(-1)) and abundant release by several relatively weak extractants (ammonium acetate EDTA, sodium pyrophosphate, hydroxylamine hydrochloride) applied on bulk soil. Normalisation with the lanthanoid pool in the underlying parent materials (sulphide-bearing sediments deposited in brackish-water) and soil water showed that the extensive release/retention in the acidic soil was accompanied by large, and variable, fractionation trends across the lanthanoid series. In low-order streams draining these soils, the lanthanoid concentrations were high and, as indicated by frontal ultrafiltration and geochemical modelling, largely dissolved (<1 kDa) in the form of the species LnSO(4)(+) and Ln(3+). In other moderately acidic stream waters (pH 4.3-4.6), organic complexation was predicted to be important in the <1 kDa fraction (especially for the heavy lanthanoids) and strongly dominating in the colloidal phase (1 kDa-0.45 mu m). Along the main stem of a stream in focus (catchment area of 223 km(2)), lanthanoid concentrations increased downstream, in particular during high flows, caused by a downstream increase in the proportion of acid sulfate soils which are extensively flushed during wet periods. The geochemical models applied to the colloidal Ln-organic phase were not successful in predicting the measured fractionation patterns.

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