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  • Kashyap, Salil
    et al.
    Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, Faculty of Science & Engineering.
    Mollén, Christopher
    Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, Faculty of Science & Engineering.
    Emil, Björnson
    Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, Faculty of Science & Engineering.
    Larsson, Erik G.
    Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, Faculty of Science & Engineering.
    Performance Analysis of (TDD) Massive MIMO with Kalman Channel Prediction2017Conference paper (Refereed)
    Abstract [en]

    In massive MIMO systems, which rely on uplink pilots to estimate the channel, the time interval between pilot transmissions constrains the length of the downlink.  Since switching between up- and downlink takes time, longer downlink blocks increase the effective spectral efficiency.  We investigate the use of low-complexity channel models and Kalman filters for channel prediction, to allow for longer intervals between the pilots.  Specifically, we quantify how often uplink pilots have to be sent when the downlink rate is allowed to degrade by a certain percentage.  To this end, we consider a time-correlated channel aging model, whose spectrum is rectangular, and use autoregressive moving average (ARMA) processes to approximate the time-variations of such channels.  We show that ARMA-based predictors can increase the interval between pilots and the spectral efficiency in channels with high Doppler spreads.  We also show that Kalman prediction is robust to mismatches in the channel statistics.

  • Mollén, Christopher
    et al.
    Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, Faculty of Science & Engineering.
    Choi, Junil
    POSTECH, South Korea.
    Larsson, Erik G.
    Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, Faculty of Science & Engineering.
    Heath, Robert W.
    University of Texas at Austin, USA.
    Achievable Uplink Rates for Massive MIMO with Coarse Quantization2017Conference paper (Refereed)
    Abstract [en]

    The high hardware complexity of a massive MIMO base station, which requires hundreds of radio chains, makes it challenging to build commercially.  One way to reduce the hardware complexity and power consumption of the receiver is to lower the resolution of the analog-to-digital converters (ADCs).  We derive an achievable rate for a massive MIMO system with arbitrary quantization and use this rate to show that ADCs with as low as 3 bits can be used without significant performance loss at spectral efficiencies around 3.5 bpcu per user, also under interference from stronger transmitters and with some imperfections in the automatic gain control.

  • Mollén, Christopher
    et al.
    Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, Faculty of Science & Engineering.
    Choi, Junil
    Department of Electrical Engineering, Pohang University of Science and Technology, Pohang, South Korea.
    Larsson, Erik G.
    Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, Faculty of Science & Engineering.
    Heath, Robert W.
    Wireless Networking and Communications Group, The University of Texas at Austin, Austin, TX, USA.
    Uplink Performance of Wideband Massive MIMO With One-Bit ADCs2017In: IEEE Transactions on Wireless Communications, ISSN 1536-1276, E-ISSN 1558-2248, Vol. 16, no 1, 87-100 p.Article in journal (Refereed)
    Abstract [en]

    Analog-to-digital converters (ADCs) stand for a significant part of the total power consumption in a massive multiple-input multiple-output (MIMO) base station. One-bit ADCs are one way to reduce power consumption. This paper presents an analysis of the spectral efficiency of single-carrier and orthogonal-frequency-division-multiplexing (OFDM) transmission in massive MIMO systems that use one-bit ADCs. A closed-form achievable rate, i.e., a lower bound on capacity, is derived for a wideband system with a large number of channel taps that employ low-complexity linear channel estimation and symbol detection. Quantization results in two types of error in the symbol detection. The circularly symmetric error becomes Gaussian in massive MIMO and vanishes as the number of antennas grows. The amplitude distortion, which severely degrades the performance of OFDM, is caused by variations between symbol durations in received interference energy. As the number of channel taps grows, the amplitude distortion vanishes and OFDM has the same performance as single-carrier transmission. A main conclusion of this paper is that wideband massive MIMO systems work well with one-bit ADCs.

  • Public defence: 2017-04-10 14:00 F3, Stockholm
    Marzinotto, Alejandro
    KTH, School of Computer Science and Communication (CSC), Robotics, perception and learning, RPL.
    Flexible Robot to Object Interactions Through Rigid and Deformable Cages2017Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    In this thesis we study the problem of robotic interaction with objects from a flexible perspective that complements the rigid force-closure approach. In a flexible interaction the object is not firmly bound to the robot (immobilized), which leads to many interesting scenarios. We focus on the secure kind of flexible interactions, commonly referred to as caging grasps. In this context, the adjective secure implies that the object is not able to escape arbitrarily far away from the robot which is caging it. A cage is a secure flexible interaction because it does not immobilize the object, but restricts its motion to a finite set of possible configurations. We study cages in two novel scenarios for objects with holes: caging through multi-agent cooperation and through dual-arm knotting with a rope. From these two case studies, we were able to analyze the caging problem in a broader perspective leading to the definition of a hierarchical classification of flexible interactions and cages.

    In parallel to the geometric and physical problem of flexible interactions with objects, we study also the problem of discrete action scheduling through a novel control architecture called Behavior Trees (BTs). In this thesis we propose a formulation that unifies the competing BT philosophies into a single framework. We analyze how the mainstream BT formulations differ from each other, as well as their benefits and limitations. We also compare the plan representation capabilities of BTs with respect to the traditional approach of Controlled Hybrid Dynamical Systems (CHDSs). In this regard, we present bidirectional translation algorithms between such representations as well as the necessary and sufficient conditions for translation convergence. Lastly, we demonstrate our action scheduling BT architecture showcasing the aforementioned caging scenarios, as well as other examples that show how BTs can be interfaced with other high level planners.

  • Sjöberg, Ted
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Sundin, Karl-Gustaf
    Oldenburg, Mats
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Calibration and validation of plastic high strain rate models for Alloy 7182013In: / [ed] E. Oñate, D.R.J. Owen, D. Peric and B. Suárez, 2013Conference paper (Refereed)
  • Yiming, Yao
    et al.
    Chalmers University of Technology, Gothenburg, Sweden.
    Lyckfeldt, Ola
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Tricoire, Aurélien
    GKN Aerospace Sweden AB, Trollhättan, Sweden..
    Lundström, Dennis
    GKN Aerospace Sweden AB, Trollhättan, Sweden..
    Klement, Uta
    Chalmers University of Technology, Gothenburg, Sweden.
    Microstructure of plasma sprayed Al2O3-3wt%TiO2 coating using freeze granulated powder2016In: Journal of Materials Science and Chemical Engineering, ISSN 2327-6045, Vol. 4, no 7, 8-14 p.Article in journal (Refereed)
    Abstract [en]

    This study is aiming at controlling the microstructure of plasma sprayed Al2O3-TiO2 composite coatings using freeze granulated powders. As sprayed and sintered Al2O3 + 3wt%TiO2 powders were air plasma sprayed with industry process parameters and compared with a commercial powder. The resulting coatings were investigated with respect to powder flowability, porosity and microstructure of the granules. The results showed that microstructure and melting fraction in the coatings could be tailored with the freeze granulation process and heat treatment conditions.

  • Germundsson, Lisa
    et al.
    SLU Partnerskap Alnarp.
    Jönsson, Håkan
    Lund University .
    Olsson, Viktoria
    Kristianstad University, School of Education and Environment, Avdelningen för Mat- och måltidsvetenskap. Kristianstad University, Research Environment Food and Meals in Everyday Life (MEAL).
    Davidsson, Paul
    Malmö Högskola.
    Moen, Ann
    Lund University .
    Johansson, Eva
    Sveriges Lantbruksuniversitet.
    FOCUS - Food Knowledge Community Skåne-Blekinge: förstudie 20162016Report (Other academic)
    Abstract [sv]

    Focus förstudieprojekt syftar till att utreda förutsättningarna för att stärka och utveckla innovationsinfrastrukturen för livsmedelssystemet i Skåne och Blekinge, för att bidra till ökad tillväxt, sysselsättning, attraktionskraft och långsiktig hållbarhet.

    Utifrån syftet ovan och ambitionen att stärka samarbetet mellan lärosätena i Skåne och Blekinge inom livsmedelsområdet ska förstudien besvara följande frågeställningar:

    1. Hur ser förutsättningarna ut för forskning, utbildning och samverkan/innovation inom livsmedelsområdet i Skåne och Blekinge?

    2. Vilka är de mest angelägna behoven avseende forskning, utbildning och samverkan/innovation för livsmedelsnäringen och offentliga aktörer?

    3. Hur kan regionala framtidssatsningar och strategier inom forskning, utbildning och samverkan inom livsmedelsområdet utformas, för att bidra till ett samlat utbud av akademisk kompetens riktat till företag och andra aktörer i hela livsmedelssystemet?

  • Zerefos, Christos S.
    et al.
    Eleftheratos, Kostas
    Kapsomenakis, John
    Solomos, Stavros
    Inness, Antje
    Balis, Dimitris
    Redondas, Alberto
    Eskes, Henk
    Allaart, Marc
    Amiridis, Vassilis
    Dahlback, Arne
    De Bock, Veerle
    Diemoz, Henri
    Engelmann, Ronny
    Eriksen, Paul
    Fioletov, Vitali
    Grobner, Julian
    Heikkila, Anu
    Petropavlovskikh, Irina
    Jaroslawski, Janusz
    Josefsson, Weine
    SMHI, Core Services.
    Karppinen, Tomi
    Koehler, Ulf
    Meleti, Charoula
    Repapis, Christos
    Rimmer, John
    Savinykh, Vladimir
    Shirotov, Vadim
    Siani, Anna Maria
    Smedley, Andrew R. D.
    Stanek, Martin
    Stubi, Rene
    Detecting volcanic sulfur dioxide plumes in the Northern Hemisphere using the Brewer spectrophotometers, other networks, and satellite observations2017In: Atmospheric Chemistry And Physics, ISSN 1680-7316, E-ISSN 1680-7324, Vol. 17, no 1, 551-574 p.Article in journal (Refereed)
  • Von Gliscynski, Ulla
    et al.
    Institut für Zoophysiologie, Universität Bonn, Germany.
    Delbeque, Jean Paul
    Université de Bourgogne, Laboratoire de Zoologie, France.
    Böcking, Detlef
    Ecole Normale Supérieure, Laboratoire de Biochimie et Physiologie du Développement, France.
    Sedlmeier, Dietrich
    Institut für Zoophysiologie, Universität Bonn, Germany.
    Dircksen, Heinrich
    Institut für Zoophysiologie, Universität Bonn, Germany.
    Lafont, René
    Ecole Normale Supérieure, Laboratoire de Biochimie et Physiologie du Développement, France.
    Three new antisera with high sensitivity to ecdysone, 3-dehydroecdysone and other A-ring derivatives: Production and characterization1995In: European Journal of Entomology, ISSN 1210-5759, E-ISSN 1802-8829, Vol. 92, no 1, 75-79 p.Article in journal (Refereed)
    Abstract [en]

    Three new antisera have been produced in rabbits immunized with E-2/3-hemisuccinate conjugates. In a competitive enzyme immunoassay (EIA) with 20-ecdysone-peroxidase as a tracer, the antisera exhibit high specificity towards the side chain of the ecdysone (E) molecule. Modifications of the A-ring do result in no or small changes of sensitivity. One antiserum (RUD-2) allows the direct quantification of total ecdysteroids in samples containing E and 3-dehydroecdysone in varying ratios, without further sophisticated sample treatment. At least one of the other antisera allows the direct quantification of mixtures of E and 25-deoxyecdysone (RUD-1). Thus, these antisera may be a useful tool in studying molting control in arthropods.

  • Nydahl, Erik
    Mid Sweden University, Faculty of Human Sciences, Department of Humanities.
    "Så gör jag af med penningar": En inblick i Kramforsbolagets skogsaffärer i lappländska Hacksjö år 18872017In: OKNYTT. Tidskrift för Johan Nordlander-sällskapet, ISSN 0349-1706, no 2017:1-2, 1-37 p.Article in journal (Refereed)
    Abstract [sv]

    Artikeln presenterar en mikrohistorisk undersökning av en skogsaffär år 1887 mellan Kramfors AB och bönderna i byn Hacksjö i Åsele lappmark. Denna affär analyseras och sätts i relation till tidigare forskning om skogsmarknaden i Norrland under 1800-talets andra hälft samt till sekelskiftets moderniseringskritiska strömningar.

  • Thorp, Robert
    Dalarna University, School of Education, Health and Social Studies, Educational Work. Stockholms universitet.
    Deconstructing Karlsson, part 1: historical consciousness2017In: Historical Encounters: A journal of historical consciousness, historical cultures and history education, E-ISSN 2203-7543, Vol. 4, no 2, 1-10 p.Article in journal (Refereed)
    Abstract [en]

    This paper presents an analysis of how leading Swedish historian and history didactical researcher Klas-Göran Karlsson presents the concept of historical consciousness in some of his most recent publications and seeks to analytically deconstruct his view of the concept. The study finds that Karlsson presents definitions of the concept that may not be compatible to each other. Using this result, the paper then tries to present and argue a view of the concept that harmonises with the one presented by Karlsson. 

  • Rosenqvist, Johanna
    et al.
    Linnaeus University, Faculty of Arts and Humanities, Department of Music and Art.
    Suneson, Ellen
    Lund University.
    Konst och subjektskapande: Neurodegenerativa nedsättningar och dialogbaserad konstpedagogik2016In: Socialmedicinsk Tidskrift, ISSN 0037-833X, Vol. 93, no 3, 288-296 p.Article in journal (Refereed)
    Abstract [en]

    Since 2007 a number of art- and research projects have been implemented where people who suffer from neurodegenerative impairments have participated in conversations about art. Previous research on these projects has mainly been focused on the physical and mental effects the art tours have had on the participants, based on interviews, surveys and questionnaires. In this text we choose to explore a different aspect of the art tours where we discuss how dialogue-based art education makes the connection between aesthetic experiences and subjecthood visible.

  • Herschend, Frands
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Arts, Department of Archaeology and Ancient History.
    Selaöns runinskrifter: en runstensgeografi2017In: Fornvännen, ISSN 0015-7813, E-ISSN 1404-9430, Vol. 112, no 1, 10-23 p.Article in journal (Refereed)
    Abstract [en]

    This is a study of a small runestone material from the Selaön Island in Lake Mälaren. As an island material, the inscriptions are set apart from their surroundings. They link in with common traits among decorated 11th runestones, but also with the characteristic breadth of middle-sized and well-defined materials. This local diversity may nevertheless be seen as a characteristic in itself of the larger Lake Mälaren area: this region is partly built from local nodes united by the lake. Based on the study three research fields are identified: 1) small-scale runestone geography and chronology, 2) the non-banal and complex relationship between design, text and ornament, 3) a dimension of intent characteristic of Selaön, that is, a local sincerity in the commemorative inscriptions. Micro-geography, complex design and mindset are thus suggested as new fields for a cognitively more rewarding contextual research into the runestone vogue in the Lake Mälaren area.

  • Gama, Fabio
    et al.
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Innovation and Design.
    Parida, Vinit
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Innovation and Design.
    Systematic Idea Generation and Organizational Capabilities for Front-End Innovation Performance in SMEs2017In: Innovation ManagementArticle in journal (Other (popular science, discussion, etc.))
    Abstract [en]

    This study seeks to answer two key questions about the front-end innovation: when do idea generation activities involving internal and external partner’s payoff, and which organizational capabilities support idea generation activities for achieving high front-end performance?

  • Thorp, Robert
    Stockholm University, Faculty of Social Sciences, Department of Education.
    Deconstructing Karlsson, part 1: Historical consciousness2017In: Historical Encounters: A journal of historical consciousness, historical cultures and history education, E-ISSN 2203-7543, Vol. 4, no 2, 1-10 p.Article in journal (Refereed)
    Abstract [en]

    This paper presents an analysis of how leading Swedish historian and history didactical researcher Klas-Göran Karlsson presents the concept of historical consciousness in some of his most recent publications and seeks to analytically deconstruct his view of the concept. The study finds that Karlsson presents definitions of the concept that may not be compatible to each other. Using this result, the paper then tries to present and argue a view of the concept that harmonises with the one presented by Karlsson. 

  • Lesser, Pamela
    et al.
    Northern Institute for Environmental and Minority Law, Arctic Centre, University of Lapland.
    Ejdemo, Thomas
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Social Sciences.
    Suopajärvi, Leena
    Faculty of Social Sciences, University of Lapland.
    Petrétei, Anna
    Northern Institute for Environmental and Minority Law, Arctic Centre, University of Lapland.
    Kestävä kaivannaistoiminta: Pohjoinen osaaminen ja tietotaito2016Report (Other academic)
    Abstract [fi]

    Kestävä kaivannaistoiminta – pohjoinen osaaminen ja tietotaito eli Sus-MinNor-projekti (Sustainable mining in the Northernmost Europe – Lessonslearned and practices developed) on Lapin liiton, Lapin yliopiston ja Luulajanteknillisen yliopiston yhteityöprojekti, jolla on kaksi tavoitetta: (1) tehostaarajat ylittävää yhteistyötä kestävän kaivostoiminnan edistämiseksiInterreg Pohjoinen -alueella ja (2) koota yhteen yhteiskuntatieteellisen kaivostutkimuksentuloksia erityisesti kaivostoiminnan vaikutuksista sekäkaivosalan ja sitä ympäröivän yhteiskunnan välisistä suhteista Euroopanpohjoisilla alueilla. Projektia on rahoittanut Interreg Pohjoinen -ohjelma jase on ollut käynnissä vuosien 2015-2016 aikana.Tämä synteesiraportti on hankkeen päätuotos ja se valottaa kaivostoiminnankestävyyttä koskevan yhteiskuntatieteellisen tutkimuksenkeskeisiä teemoja, tutkimuksissa tunnistettuja hyviä käytäntöjä sekätietovajeita Suomessa ja Ruotsissa. Raportin lisäksi hankkeessa on järjestettytutkijatyöpaja Ruotsin Haaparannalla huhtikuussa 2016 ja päätösseminaariRovaniemellä syyskuussa 2016.Synteesiraportin alussa on luotu katsaus kestävän kaivostoiminnankansainvälisiin aloitteisiin vertailukohdaksi Suomen ja Ruotsin tutkimusaiheisiin.Vaikka kansainväliset kestävän kaivotoiminnan aloitteetovat painottuneet kehittyvien maiden kysymyksiin ja ovat siten hyvinerilaisia kuin Suomen ja Ruotsin tutkimustarpeet, myös samankaltaisiateemoja on paikannettavissa. Tällaisia ovat esimerkiksi sidosryhmätyöskentelyja sosiaalinen kestävyys. Eroista huolimatta kansainvälisenkeskustelun ja paikallisten tutkimusprojektien vertailu antaamahdollisuuden synergiseen oppimiseen.

  • Lesser, Pamela
    et al.
    Northern Institute for Environmental and Minority Law, Arctic Centre, University of Lapland.
    Ejdemo, Thomas
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Social Sciences.
    Suopajärvi, Leena
    Faculty of Social Sciences, University of Lapland.
    Petrétei, Anna
    Northern Institute for Environmental and Minority Law, Arctic Centre, University of Lapland.
    Hållbar gruvnäring: nordisk kunskap, god praxis och kunskapsluckor2016Report (Other academic)
    Abstract [sv]

    SusMinNor–projektet är ett samarbete mellan Finska Lapplands Förbund,Lapplands Universitet (Rovaniemi), och Luleå tekniska universitet.Projektet har två huvudsakliga målsättningar – att främja gränsöverskridandesamverkan kring hållbar gruvnäring i Interreg Nord-området,och att samla och syntetisera viktiga forskningsresultat från i huvudsakde samhällsvetenskapliga disciplinerna, särskilt kring konsekvenser avgruvnäring och synergier mellan gruvnäring och samhällen i nordligasteEuropa. Projektet finansieras av Interreg Nord och genomförs underperioden 2015-2016.Inom ramen för projektet har en forskningsworkshop genomförts iHaparanda, Sverige i april 2016 samt ett slutseminarium som genomfördesden 21 september 2016 i Rovaniemi, Finland. Projektet har mynnat ut iföreliggande syntesrapport som belyser de huvudsakliga teman som forskningenkring hållbar gruvnäring i norra Finland och Sverige har adresserat,samt identifierar god praxis och kunskapsluckor i litteraturen.En genomgång av viktiga internationella initiativ kring hållbar gruvnäringhar gjorts för att möjliggöra jämförelser mellan frågeställningarsom undersökts i Finland och Sverige. Sådana undersökningar och til�-lämpningar av deras resultat i utvecklingsländer skiljer sig på ett betydandesätt från de behov som finns i Finland och Sverige, men teman som”stakeholder engagement” strategier (d.v.s. hur intressenter och sakägarebemöts) samt social hållbarhet är viktiga även i de nordiska länderna.Trots viktiga skillnader finns ofta också möjligheter till lärande av internationellaerfarenheter.

  • Kans, Mirka
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Galar, Diego
    Luleå University of Technology.
    The Impact of Maintenance 4.0 and Big Data Analytics within Strategic Asset Management2017In: MPMM 2016, Maintenance, Performance, Measurement & Management: conference proceedings / [ed] Diego Galar, Dammika Seneviratne, Luleå: Luleå University of Technology, 2017, 96-103 p.Conference paper (Refereed)
    Abstract [en]

    The latest industrial revolution is manifested by smart and networking equipment. Realizing the full value of these machineries, and other business assets, has become increasingly important. Strategic asset management faces managerial, technical as well as methodological challenges, of which some could be reduced or overcome by applying technological solutions such as Internet of things, cloud computing, cyber-physical systems and big data analytics. This paper outlines the impact of the emerging technologies in the area of strategic management with special emphasis on the analytics as service provider for the maintenance functions.

  • Bosch-Sijtsema, Petra
    et al.
    Department of Architecture and Civil Engineering, division Construction Management, Chalmers University of Technology, Gothenburg, Sweden.
    Isaksson, Anders
    Department of Technology Management and Economics, division of Innovation and R&D Management, Chalmers University of Technology, Gothenburg, Sweden.
    Lennartsson, Martin
    Jönköping University, School of Engineering, JTH, Civil Engineeering and Lighting Science.
    Linderoth, Henrik
    Jönköping University, School of Engineering, JTH, Civil Engineeering and Lighting Science.
    Barriers and facilitators for BIM use among Swedish medium-sized contractors: We wait until someone tells us to use it2017In: Visualization in Engineering, ISSN 2213-7459, Vol. 5, no 3, 1-12 p.Article in journal (Refereed)
    Abstract [en]

    Background: The pace of diffusion of BIM (Building Information Modelling) use is considered to increase with governmentalinitiatives in which public clients in countries like Finland, Singapore, United Kingdom, and Sweden begin requiring BIM as apart of the project delivery. Currently, larger contractor firms use BIM to a certain extent. However, BIM use by mid-sizedcontractor firms (that is, firms with 50–500 employees that can successfully compete with larger contractors on projects costinga maximum of 50 million Euros) is relatively unknown. Hence, the aim of the paper is to explore current use and perceivedconstraints and driving forces of BIM-implementation with respect to mid-sized contractors.

    Methods: A mixed method approach was applied, and data was collected through an interview study and a survey involvingchief executive officers or their closest sub-ordinates in mid-sized contractor firms in Sweden. The survey was based on atechnology-, organization-, and environment framework that is used in information systems research to study the use of inter-organizational information systems. The total population of firms in the survey corresponded to 104. The study presented thepreliminary results based on 32 answers (with a 31% response rate).

    Results: Fifty-eight percent of the surveyed respondents stated that they had been involved in a project in which BIM wasused in some manner. The most commonly used application included visualization, which also facilitates coordination andcommunication. The biggest perceived constraints involved partners that did not use BIM, lack of demand from clients, andthe absence of internal demand in the company. With respect tothe two last obstacles, significant differences existedbetween users and non-users. The most common perceived driving forces included the fact that BIM is perceived as ameans to follow technical development and that BIMprovides competitive advantages to the company.

    Conclusions: It is concluded that the main driver responsible for BIM-implementation is mainly determined by anindividual’s subjective positive or negative evaluation of BIM, instead of external pressure from clients and partners or by theinternal capacity and knowledge to use BIM.

  • Metso, Lasse
    et al.
    Lappeenranta University of Technology .
    Kans, Mirka
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    An ecosystem perspective on asset management information2017In: MPMM 2016, Maintenance, Performance, Measurement & Management: conference proceedings / [ed] Diego Galar, Dammika Seneviratne, Luleå: Luleå University of Technology, 2017, 69-75 p.Conference paper (Refereed)
    Abstract [en]

    Big Data and Internet of Things will increase the amount of data on asset management exceedingly. Data sharing with an increased number of partners in the area of asset management is important when developing business opportunities and new ecosystems. An asset management ecosystem is a complex set of relationships between parties taking part in asset management actions. In this paper, the current barriers and benefits of data sharing are identified based on the results of an interview study. The main benefits are transparency, access to data and reuse of data. New services can be created by taking advantage of data sharing. The main barriers to sharing data are an unclear view of the data sharing process and difficulties to recognize the benefits of data sharing. For overcoming the barriers in data sharing, this paper applies the ecosystem perspective on asset management information. The approach is explained by using the Swedish railway industry as an example.

  • Carlerby, Heidi
    et al.
    Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences.
    Persson, Mats
    Headquarters, Policy and Plans Department, Swedish Armed Forces.
    Officials Reflections about Health Promoting Factors among Newly Arrivals: An Introductory Analysis2017In: International Journal of Community & Family Medicine, ISSN 2456-3498, Vol. 2, no 1, IJCFM-124Article in journal (Refereed)
    Abstract [en]

    Background: Resulting from conflicts, millions of peoples have been forced to leave their countries of origin. In Sweden, the Employment Agency is responsible for making decisions of immigrants’ residence in municipalities and in co-operation with these allow the immigrants’ establishment in the society. Preventive interventions among migrants and refugees, and health interventions in heterogeneous populations show that increased participation in society has positive imprints on health development. A new country includes getting acquaintance with non-familiar cultures. For example, other expectations on rules of gender, sickness, and illness. Recent years the low density populated areas in northern Sweden have received a high number of refugees in comparison with their population size. The purpose of this study was to explore how officials the Employment Agency and a selection of municipalities reflect over and define health promoting factors in their meetings with newly arrived.

    Methods: All officials (N 68) in one of the four northern counties were invited to recording their reflections on health promoting factors close to their meetings with newly arrived. The officials recorded how they defined health promoting factors according to the Audit method. The data collection of experiences of importance considering health promotion and social determinants was collected by five focus group interviews with twenty-three officials.

    Results: This study showed that the officials defined access to the health care, participation in the society, and sufficient collaboration between the authorities for not losing valuable time during the establishment period as imported factors for their clients’ opportunities for health. The officials take power among males for given, while they more often reflected over lack of power among women. However, the Swedish ideal of gender as equal quite often a challenge the newly arrivals.

  • Jansson, Peter
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Results from Geant4 calculations of energy deposition from gamma- and neutron radiation emitted from selected cases of used boiling water reactor nuclear fuel assemblies in a KBS-3 type deep geological repository2017Data set
    Abstract [en]

    Monte Carlo calculations, using the Geant4 framework version 10.02, of energy deposition from gamma- and neutron radiation emitted from boiling water reator (BWR) fuel assemblies in a KBS-3 type deep geological repository for used nuclear fuel have been performed. This dataset contains the results of the calculations. Three fuel rods were arbitrarily selected as source rods for 662 keV and 2.75 MeV gamma- and neutron radiation, respectively. For each of the six cases, the energy deposited in a 3-dimensional (x,y,z) mesh with 1 cm resolution was calculated and tallied as function of the type of particle that deposited the energy.

  • Lilliedahl, Jonathan
    Jönköping University, School of Education and Communication.
    Teoribaserad utvärdering av lämplighetsbedömning: Rapport från försöksverksamhet med lämplighetsbedömning vid antagning till lärar- och förskollärarutbildning2017Report (Other academic)
    Abstract [sv]

    Föreliggande rapport är en utvärdering av den försöksverksamhet med lämplighetsbedömning vid antagning till lärar- och förskollärarutbildning som bedrivits vid Jönköping University på uppdrag av Universitets- och högskolerådet.

    Försöksverksamheten har varit baserad på ett särskilt regeringsbeslut grundat i antaganden om lämplighetsbedömningens mening och eventuella effekter. Därför är denna utvärdering teoribaserad, det vill säga att den utgår från antaganden om lämplighetsbedömningens funktion givet en viss verksamhetslogik.

    Utvärderingen är genomförd på lokal nivå av undertecknad och i nära anslutning till genomförd lämplighetsbedömning. Underlaget består främst av inblandade parters upplevelser i kombination med utfall under ansökningsförfarandet. Sammantaget kombineras processutvärderande delar med mer effektutvärderande resonemang. En mer omfattande utvärdering kommer att genomföras av ansvarig myndighet, Universitets- och högskolerådet.

    Resultat talar för att krav på visad lämplighet kan ha effekter på sökandes agerande under ansöknings- och antagningsfaser. Lämplighetsbedömningen har först och främst fungerat som ett prov på sökande motivation för att bli antagen till utbildningen. Kravet som sådant – att sökande måste uppvisat lämplighet för behörighet till utbildningen – har förmodligen haft störst effekt, även om behållningen av självbedömning och andra aspekter inte bör underskattas.

    Välkommen att läsa utvärderingen i sin helhet för en mer utvecklad redogörelse av ovanstående.

  • Charapan, Nadzeya
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Arts, Department of ALM. The Faculty of Communication of Vilnius University, Lithuania.
    When in Sweden, do as Swedes do: Deconstructing the cultural metaphor of “the Swedish stuga” during a trip to Ramhäll2017In: Tidskrift för ABM, ISSN 2002-4614, Vol. 2, no 1, 27-38 p.Article in journal (Other academic)
  • Lundberg, Inger
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Arts, Department of ALM.
    American museums – an experience2017In: Tidskrift för ABM, ISSN 2002-4614, Vol. 2, no 1, 20-26 p.Article in journal (Other academic)
  • Dahlqvist, Maja
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Arts, Department of ALM.
    Arkiv och kulturarv i Sarajevo: Rapport från en praktik- och forskningsresa2017In: Tidskrift för ABM, ISSN 2002-4614, Vol. 2, no 1, 15-19 p.Article in journal (Other (popular science, discussion, etc.))
  • Lastauskas, Povilas
    et al.
    Tatsi, Eirini
    Stockholm University, Faculty of Social Sciences, The Swedish Institute for Social Research (SOFI).
    Spatial Nexus in Crime and Unemployment in Times of Crisis2017Report (Other academic)
  • Aaboud, M.
    et al.
    Bergeås, Elin Kuutmann
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ferrari, Arnaud
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Gradin, P.O. Joakim
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Madsen, Alexander
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Öhman, Henrik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Rangel-Smith, Camilla
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Zwalinski, L.
    Measurement of the t(t)over-bar production cross-section using e mu events with b-tagged jets in pp collisions at root s=13 TeV with the ATLAS detector2016In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 761, 136-157 p.Article in journal (Refereed)
    Abstract [en]

    his paper describes a measurement of the inclusive top quark pair production cross-section (sigma(t (t) over bar)) with a data sample of 3.2 fb(-1) of proton-proton collisions at a centre-of-mass energy of root s = 13 TeV, collected in 2015 by the ATLAS detector at the LHC. This measurement uses events with an opposite-charge electron-muon pair in the final state. Jets containing b-quarks are tagged using an algorithm based on track impact parameters and reconstructed secondary vertices. The numbers of events with exactly one and exactly two b-tagged jets are counted and used to determine simultaneously sigma(t (t) over bar) and the efficiency to reconstruct and b-tag a jet from a top quark decay, thereby minimising the associated systematic uncertainties. The cross-section is measured to be: s(t (t) over bar)= 818 +/- 8 (stat) +/- 27 (syst) +/- 19 (lumi) +/- 12 (beam) pb, where the four uncertainties arise from data statistics, experimental and theoretical systematic effects, the integrated luminosity and the LHC beam energy, giving a total relative uncertainty of 4.4%. The result is consistent with theoretical QCD calculations at next-to-next-to-leading order. A fiducial measurement corresponding to the experimental acceptance of the leptons is also presented.

  • Aaboud, M.
    et al.
    Bergeås, Elin Kuutmann
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ferrari, Arnaud
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Gradin, P.O. Joakim
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Madsen, Alexander
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Öhman, Henrik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Rangel-Smith, Camilla
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Zwalinski, L.
    Measurement of the total cross section from elastic scattering in pp collisions at root s=8 TeV with the ATLAS detector2016In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 761, 158-178 p.Article in journal (Refereed)
    Abstract [en]

    A measurement of the total ppcross section at the LHC at root s = 8TeV is presented. An integrated luminosity of 500 mu b(-1) was accumulated in a special run with high-beta* beam optics to measure the differential elastic cross section as a function of the Mandelstam momentum transfer variable t. The measurement is performed with the ALFA sub-detector of ATLAS. Using a fit to the differential elastic cross section in the -t range from 0.014 GeV2 to 0.1 GeV2 to extrapolate t -> 0, the total cross section, sigma(tot)( pp -> X), is measured via the optical theorem to be sigma(tot)(pp -> X) = 96.07 +/- 0.18 (stat.) +/- 0.85 (exp.) +/- 0.31 (extr.) mb, where the first error is statistical, the second accounts for all experimental systematic uncertainties and the last is related to uncertainties in the extrapolation t -> 0. In addition, the slope of the exponential function describing the elastic cross section at small t is determined to be B = 19.74 +/- 0.05 (stat.) +/- 0.23 (syst.) GeV-2.

  • Aaboud, M.
    et al.
    Bergeås, Elin Kuutmann
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ferrari, Arnaud
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Gradin, P.O. Joakim
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Madsen, Alexander
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Öhman, Henrik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Rangel-Smith, Camilla
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Zwalinski, L.
    Measurement of the top quark mass in the t(t)over-bar -> dilepton channel from root s=8TeVATLAS data2016In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 761, 350-371 p.Article in journal (Refereed)
    Abstract [en]

    A search has been made for supersymmetry in a final state containing two photons and missing transverse momentum using the ATLAS detector at the Large Hadron Collider. The search makes use of 3.2 fb−1 of proton-proton collision data collected at a centre-of-mass energy of 13 TeV in 2015. Using a combination of data-driven and Monte-Carlo-based approaches, the Standard Model background is estimated to be 0.27+0.22−0.10 events. No events are observed in the signal region; considering the expected background and its uncertainty, this observation implies a model-independent 95 % CL upper limit of 0.93 fb (3.0 events) on the visible cross section due to physics beyond the Standard Model. In the context of a generalized model of gauge-mediated supersymmetry breaking with a bino-like next-to-lightest supersymmetric particle, this leads to a lower limit of 1650 GeV on the mass of a degenerate octet of gluino states, independent of the mass of the lighter bino-like neutralino.

  • Olsmats, Carl
    et al.
    Nilsson, Birgitta
    Pousette, Sandra
    RISE, Innventia.
    Perceptions of sustainability and functional aspects on liquid carton board packaging materials versus competing materials for juice applications in Sweden2015In: Beverages, E-ISSN 2306-5710, Vol. 1, no 3, 194-203 p.Article in journal (Refereed)
    Abstract [en]

    This research explores the downstream perceptions of liquid carton board versus competing materials in packaging applications for juice. The methodology used is focus groups. The context is sustainability and functional performance, and related potential implications for the beverage industry value chain. The purpose is to get a deeper insight and understanding of functionality in relation to juice beverage packaging. The results confirm that there is no optimal packaging for every juice product, but a multitude, depending on the distribution channel, retail outlet, customer preferences, and context of consumption. There are some general packaging preferences, but the main deciding criteria for purchase seem to be the product characteristics in terms of quality, taste, brand, price and shelf life. For marketing reasons, packaging has to be adopted to the product and its positioning, liquid carton board packaging seem to have some functional advantages in distribution and is considered as sustainable and functional among many consumers. Major drawbacks seem to be shape limitations, lack of transparency, and lack of a “premium look”. To improve packaging performance and avoid sub-optimization, actors in the beverage industry value chain need to be integrated in development processes.

  • Public defence: 2017-04-13 10:00 Gardaulan, Stockholm
    Ramachandraiah, Harisha
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Microfluidic based isolation of circulating tumor cells from whole blood for cancer diagnostics2017Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Detection of circulating tumor cells (CTC) in peripheral blood is indicative of early recognition of tumor progression and such an important biomarker for early diagnosis, staging, monitoring and prognosis of cancer. However, CTC are found in very low concentrations and reliable isolation of these rare cells is challenging. Microfluidics enables precise manipulation of fluids and cells and is ideal for cell sorting methods for clinical diagnostics. The thesis contributes towards the development of microfluidic based CTC isolation methods from peripheral blood. The methods are based on size and immunoaffinity. The first part of the thesis describes the phenomenon of inertial focusing for size based cell separation at high throughputs. In paper 1, we demonstrate continuous filtration of leukocytes from diluted blood, with an efficiency of 78% at a flow rate of 2.2ml/min. In the paper 2, separation of total and subpopulation of leukocytes with a purity of 86% for granulocytes and 91% for lymphocytes is demonstrated. Furthermore, cancer cells spiked into whole blood could be separated at a yield of 88%. Finally, in paper 3 and 4 we unravel parts of the unexplored elasto-inertial microfluidics and was utilized to precisely focus the cells, as part of an integrated optofluidic micro flow cytometer device, capable to simultaneously measure fluorescence and scattering of cells and particles at a rate of 2500 particles/sec (paper 4). Second part of the thesis focuses on acoustophoresis. In (paper 5), a multifunctional acoustic microdevice was developed for isolation of cancer cells from red blood cells with a separation efficiency of 92.4% and trapping efficiency of 93%. In (paper 6), microbubbles activated acoustic cell sorter was developed for affinity based cell separation. As a proof of principle, cancer cells in a suspension were separated at an efficiency of 75%. In the third part, using cellulose nano fibrils (paper 7), we demonstrate efficiently capture and release of cancer cells at a release efficiency of 95%. Finally, a novel, single step self-assembly of spider silk proteins is introduced inside microfluidic channels for effective capture of cancer cells with 85% capture efficiency and subsequent release of captured cells with 95% release efficiency (paper 8). The novel recombinant silk modified microfluidic device was validated using pancreatic cancer patients. In summary, we have developed different microfluidic based isolation technologies for the capture and characterization of CTC.

  • Malti, Abdellah
    et al.
    Edberg, Jesper
    Granberg, Hjalmar
    RISE, Innventia.
    Ullah Khan, Zia
    Andreasen, Jens W
    Liu, Xianjie
    Zhao, Dan
    Zhang, Hao
    Yao, Yulong
    Brill, Joseph W
    Engquist, Isak
    Fahlman, Mats
    Wågberg, Lars
    Crispin, Xavier
    Berggren, Magnus
    An organic mixed ion-electron conductor for power electronics2015In: Advanced science, E-ISSN 2198-3844, 1500305Article in journal (Refereed)
    Abstract [en]

    A mixed ionic–electronic conductor based on nanofibrillated cellulose composited with poly(3,4-ethylene-dioxythio­phene):­poly(styrene-sulfonate) along with high boiling point solvents is demonstrated in bulky electrochemical devices. The high electronic and ionic conductivities of the resulting nanopaper are exploited in devices which exhibit record values for the charge storage capacitance (1F) in supercapacitors and transconductance (1S) in electrochemical transistors.

  • Aaboud, M.
    et al.
    Bergeås, Elin Kuutmann
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ellert, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ferrari, Arnaud
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Gradin, P.O. Joakim
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Madsen, Alexander
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Öhman, Henrik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Rangel-Smith, Camilla
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Zwalinski, L.
    Search for high-mass new phenomena in the dilepton final state using proton-proton collisions at root s=13 TeV with the ATLAS detector2016In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 761, 372-392 p.Article in journal (Refereed)
    Abstract [en]

    A search is conducted for both resonant and non-resonant high-mass new phenomena in dielectron and dimuon final states. The search uses View the MathML source3.2fb−1 of proton–proton collision data, collected at View the MathML sources=13TeV by the ATLAS experiment at the LHC in 2015. The dilepton invariant mass is used as the discriminating variable. No significant deviation from the Standard Model prediction is observed; therefore limits are set on the signal model parameters of interest at 95% credibility level. Upper limits are set on the cross-section times branching ratio for resonances decaying to dileptons, and the limits are converted into lower limits on the resonance mass, ranging between 2.74 TeV and 3.36 TeV, depending on the model. Lower limits on the ℓℓqqℓℓqq contact interaction scale are set between 16.7 TeV and 25.2 TeV, also depending on the model.

  • Wik, Martin
    Stockholms universitet, Institutionen för geologiska vetenskaper.
    Emission of methane from northern lakes and ponds2016Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Northern lakes and ponds are abundant and emit large amounts of the potent climate forcer methane to the atmosphere at rates prone to change with amplified Arctic warming. In spite of being important, fluxes from surface waters are not well understood. Long-term measurements are lacking and the dominant and irregular transport mode ebullition (bubbling) is rarely quantified, which complicate the inclusion of lakes and ponds in the global methane budget. This thesis focuses on variations in emissions on both local and regional scales. A synthesis of methane fluxes from almost all studied sites constrains uncertainties and demonstrates that northern lakes and ponds are a dominant source at high latitudes. Per unit area variations in flux magnitudes among different types of water bodies are mainly linked to water depth and type of sediment. When extrapolated, total area is key and thus post-glacial lakes dominate emissions over water bodies formed by peat degradation or thermokarst processes. Further, consistent multiyear measurements in three post-glacial lakes in Stordalen, northern Sweden, reveal that seasonal ebullition, primarily driven by fermentation of acetate, can be predicted by easily measured parameters such as temperature and heat energy input over the ice-free season. Assuming that most water bodies respond similarly to warming, this thesis also suggests that northern lakes and ponds will release substantially more methane before the end of the century, primarily as a result of longer ice-free seasons. Improved uncertainty reductions of both current and future estimates rely on increased knowledge of landscape-level processes related to changes in aquatic systems and organic loading with permafrost thaw, as well as more high-quality measurements, seldom seen in contemporary data. Sampling distributed over entire ice-free seasons and across different depth zones is crucial for accurately quantifying methane emissions from northern lakes and ponds.

  • Blume-Werry, Gesche
    Umeå universitet, Institutionen för ekologi, miljö och geovetenskap.
    The hidden life of plants: fine root dynamics in northern ecosystems2016Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Fine roots constitute a large part of the primary production in northern (arctic and boreal) ecosystems, and are key players in ecosystem fluxes of water, nutrients and carbon. Data on root dynamics are generally rare, especially so in northern ecosystems. However, those ecosystems undergo the most rapid climatic changes on the planet and a profound understanding of form, function and dynamics of roots in such ecosystems is essential.

    This thesis aimed to advance our knowledge about fine root dynamics in northern ecosystems, with a focus on fine root phenology in natural plant communities and how climate change might alter it. Factors considered included thickness and duration of snow cover, thawing of permafrost, as well as natural gradients in temperature. Experiments and observational studies were located around Abisko (68°21' N, 18°45' E), and in a boreal forest close to Vindeln (64°14'N, 19°46'E), northern Sweden. Root responses included root growth, total root length, and root litter input, always involving seasonal changes therein, measured with minirhizotrons. Root biomass was also determined with destructive soil sampling. Additionally, aboveground response parameters, such as phenology and growth, and environmental parameters, such as air and soil temperatures, were assessed.

    This thesis reveals that aboveground patterns or responses cannot be directly translated belowground and urges a decoupling of above- and belowground phenology in terrestrial biosphere models. Specifically, root growth occurred outside of the photosynthetically active period of tundra plants. Moreover, patterns observed in arctic and boreal ecosystems diverged from those of temperate systems, and models including root parameters may thus need specific parameterization for northern ecosystems. In addition, this thesis showed that plant communities differ in root properties, and that changes in plant community compositions can thus induce changes in root dynamics and functioning. This underlines the importance of a thorough understanding of root dynamics in different plant community types in order to understand and predict how changes in plant communities in response to climate change will translate into root dynamics. Overall, this thesis describes root dynamics in response to a variety of factors, because a deeper knowledge about root dynamics will enable a better understanding of ecosystem processes, as well as improve model prediction of how northern ecosystems will respond to climate change.

  • Becher, Marina
    Umeå universitet, Institutionen för ekologi, miljö och geovetenskap.
    Cryogenic soil processes in a changing climate2016Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    A considerable part of the global pool of terrestrial carbon is stored in high latitude soils. In these soils, repeated cycles of freezing and thawing creates soil motion (cryoturbation) that in combination with other cryogenic disturbance processes may play a profound role in controlling the carbon balance of the arctic soil. Conditions for cryogenic soil processes are predicted to dramatically change in response to the ongoing climate warming, but little is known how these changes may affect the ability of arctic soils to accumulate carbon. In this thesis, I utilize a patterned ground system, referred to as non-sorted circles, as experimental units and quantify how cryogenic soil processes affect plant communities and carbon fluxes in arctic soils. I show that the cryoturbation has been an important mechanism for transporting carbon downwards in the studied soil over the last millennia. Interestingly, burial of organic material by cryoturbation appears to have mainly occurred during bioclimatic events occurring around A.D. 900-1250 and A.D. 1650-1950 as indicated by inferred 14C ages. Using a novel photogrammetric approach, I estimate that about 0.2-0.8 % of the carbon pool is annually subjected to a net downward transport induced by the physical motion of soil. Even though this flux seems small, it suggests that cryoturbation is an important transporter of carbon over centennial and millennial timescales and contributes to translocate organic matter to deeper soil layers where respiration proceeds at slow rates. Cryogenic processes not only affect the trajectories of the soil carbon, but also generate plant community changes in both species composition and abundance, as indicated by a conducted plant survey on non-sorted circles subjected to variable differential frost heave during the winter. Here, disturbance-tolerant plant species, such as Carex capillaris and Tofieldia pusilla, seem to be favoured by disturbance generated by the differential heave. Comparison with findings from a previous plant survey on the site conducted in the 1980s suggest that the warmer temperatures during the last decades have resulted in decreased differential heave in the studied non-sorted circles. I argue that this change in cryogenic activity has increased abundance of plants present in the 1980s. The fact that the activity and function of the non-sorted circles in Abisko are undergoing changes is further supported by their contemporary carbon dioxide (CO2) fluxes. Here, my measurements of CO2 fluxes suggest that all studied non-sorted circles act as net CO2 sources and thus that the carbon balance of the soils are in a transition state. My results highlight the complex but important relationship between cryogenic soil processes and the carbon balance of arctic soils.

  • Lett, Signe
    Umeå universitet, Institutionen för ekologi, miljö och geovetenskap.
    Mosses as mediators of climate change: implications for tree seedling establishment in the tundra2017Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Alpine and arctic tree line expansion depends on the establishment of tree seedlings above the current tree line, which is expected to occur with climate warming. However, tree lines often fail to respond to higher temperatures. Other environmental factors are therefore likely important for tree seedling establishment. Above the tree line, establishing seedlings encounter existing vegetation such as bryophytes, which often dominate in arctic and alpine tundra. Bryophytes modify their environment in various ways and may mediate climate change effects on establishing tree seedlings, and with that tree line expansion. The aim of this thesis was to understand if and how the environment, in particular bryophytes, mediates the impact of climate change on tree seedling establishment at the alpine and arctic tree line. This was explored by reviewing literature on tree seedling establishment at alpine and arctic tree lines globally. In addition, tree seedling survival and growth of Betula pubescens and Pinus sylvestris were assessed experimentally. Here, individuals were planted into mono-specific mats of different bryophytes species and exposed to warming and different precipitation regimes. The literature review revealed that besides from temperature, tree seedling establishment is affected by a wide range of abiotic and biotic factors including water, snow, nutrients, light, disturbance and surrounding vegetation. Furthermore the review revealed that for example vegetation can change tree seedling responses to climate change. The experiments showed that especially tree seedling survival was adversely affected by the presence of bryophytes and that the impacts of bryophytes were larger than those of the climate treatments. Seedling growth, on the other hand, was not hampered by the presence of bryophytes, which is in line with earlier findings that seedling survival, growth and seed germination do not respond similarly to changes in environmental conditions. Moreover, we found several indications that vegetation above the tree line, including bryophytes, mediated tree seedling responses to warming and precipitation or snow cover. This thesis shows that temperature alone should not be used to predict future tree seedling establishment above the alpine and arctic tree line and that extrapolations from climate envelope models could strongly over or under estimate tree line responses to warming. This underlines the value of multi-factorial studies for understanding the interplay between warming and other environmental factors and their effects on tree seedling establishment across current tree lines.

  • Tettey, Uniben Yao Ayikoe
    Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology.
    Primary energy use of residential buildings - implications of materials, modelling and design approaches2017Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Buildings can play an essential role in the transition to a sustainable society. Different strategies, including improved energy efficiency in buildings, substitution of carbon intensive materials and fuels, efficient energy supply among others can be employed for this purpose. In this thesis, the implications of different insulation materials, modelling and design strategies on primary energy use of residential buildings are studied using life cycle and system perspective. Specifically, the effects of different insulation materials on production primary energy and CO2 emission of buildings with different energy performance are analysed. The results show that application of extra insulation materials to building envelope components reduces the operating primary energy use but more primary energy is required for the insulation material production. This also slightly increases the CO2 emissions from material production. The increases in primary energy use and CO2 emissions are mainly due to the variations in the quantities, types and manufacturing processes of the insulation materials. Thus, choice of renewable based materials with energy efficient manufacturing is important to reduce primary energy use and GHG emissions for building material production.

    Uncertainties related to building modelling input parameters and assumptions and how they influence energy balance calculations of residential buildings are explored. The implications on energy savings of different energy efficiency measures are also studied. The results show that input data and assumptions used for energy balance simulations of buildings vary widely in the Swedish context giving significant differences in calculated energy demand for buildings. Among the considered parameters, indoor air temperature, internal heat gains and efficiency of ventilation heat recovery (VHR) have significant impacts on the simulated building energy performance as well as on the energy efficiency measures. The impact of parameter interactions on calculated space heating of buildings is rather small but increases with more parameter combinations and more energy efficient buildings. Detailed energy characterisation of household equipment and technical installations used in a building is essential to accurately calculate the energy demand, particularly for a low energy building.

    The design and construction of new buildings present many possibilities to minimise both heating and cooling demands over the lifecycle of buildings, and also in the context of climate change. Various design strategies and measures are analysed for buildings with different energy performance under different climate scenarios. These include household equipment and technical installations based on best available technology, bypassing the VHR unit, solar shading of windows, combinations of window u- and g-values, different proportions of glazed window areas and façade orientations and mechanical cooling. The results show that space heating and cooling demands vary significantly with the energy performance of buildings as well as climate scenarios. Space heating demand decreases while space cooling demand and the risk of overheating increase considerably with warmer climate. The space cooling demand and overheating risk are more significant for buildings with higher energy performance. Significant reductions are achieved in the operation final energy demands and overheating is avoided or greatly reduced when different design strategies and measures are implemented cumulatively under different climate change scenarios.

    The primary energy efficiency of heat supply systems depends on the heat production technology and type of fuel use. Analysis of the interaction between different design strategies and heat supply options shows that the combination of design strategies giving the lowest primary energy use for space heating and cooling varies between heat supply from district heating with combined heat and power (CHP) and heat only boilers (HOB). The primary energy use for space heating is significantly lower when the heat supply is from CHP rather than HOB. Operation primary energy use is significantly reduced with slight increase in production primary energy when the design strategies are implemented. The results suggest that significant primary energy reductions are achievable under climate change, if new buildings are designed with appropriate strategies.

  • Jansson, Ina-Maria
    et al.
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Arts, Department of ALM.
    Huvila, Isto
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Arts, Department of ALM.
    Förord2017In: Tidskrift för ABM, ISSN 2002-4614, Vol. 2, no 1, 1-3 p.Article in journal (Other academic)
  • Edin, Elisabet
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Arts, Department of ALM.
    Exploring creative spaces in Australian libraries2017In: Tidskrift för ABM, ISSN 2002-4614, Vol. 2, no 1, 39-43 p.Article in journal (Other academic)
  • Ekström, Björn
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Arts, Department of ALM.
    Publiceringsvariationer: en jämförelse mellan DigitaltMuseum och UbuWeb2017In: Tidskrift för ABM, ISSN 2002-4614, Vol. 2, no 1, 4-14 p.Article in journal (Refereed)
    Abstract [en]

    In the digitalization continuum of art and artefacts, the questions how and through which mediations artistic material ought to be presented are vital ones. This debate is here discussed with two such initiatives, namely the pan-Nordic museum portal DigitaltMuseum and the avant-garde repository UbuWeb. The initiatives are explained in an information scientific context, followed by a discussion of the repositories’ knowledge organization and user perspectives. Technological as well as juridical issues are thereafter brought up in order to illuminate the presentational differences between DigitaltMuseum and UbuWeb respectively. The arts council-funded DigitaltMuseum is viewed as a publication tool for Norwegian and Swedish museums to bring out various artefacts into the public web-sphere. UbuWeb is in turn defined as a rhizomatic guerilla-initiative for ensuring the digital prolonging for avant-garde material. The two repositories are in different ways concluded as significant platforms for the web-based display of digitized artistic objects and concepts.

  • Olve, Nils-Göran
    et al.
    Linköping University, Department of Management and Engineering, Industrial Economics. Linköping University, Faculty of Science & Engineering.
    Petri, Carl-Johan
    Linköping University, Department of Management and Engineering, Industrial Economics. Linköping University, Faculty of Science & Engineering.
    Särredovisning av kostnader i kommunal verksamhet: Rapport från sju kommuner med erfarenhet av att rapportera om kostnader för olika kalkylobjekt2017Report (Other (popular science, discussion, etc.))
    Abstract [sv]

    Den här rapporten handlar om särredovisning av kostnader i sju svenska kommuner. En rad olika aktörer kan vara intresserade av en verksamhets kostnader, bland annat Konkurrensverket för att avgöra om en organisation gör sig skyldig till över- eller underprissättning. Även myndigheter som Statistiska centralbyrån (SCB), kommunpolitiker och tjänstemän samt media ställer frågor om kostnaden för specifika kalkylobjekt (till exempel processer, brukarkategorier eller produkter). Ofta gäller det något som inte följs upp rutinmässigt. Hur besvaras sådana frågor?

    Vi har undersökt detta genom en explorativ studie i sju svenska kommuner. Fokus i rapporten ligger på kostnadssammanställningar som görs i tillägg till bokföringens löpande uppföljning. Sådan särredovisning kan både göras ad hoc (för att besvara en unik fråga) och löpande.

    Studiens syfte är att beskriva hur sju svenska kommuner med stor erfarenhet av uppföljning och analys, hanterar frågor om kostnader för kalkylobjekt som inte redan är föremål för löpande särredovisning samt identifiera resurser och kompetenser som krävs för att lyckas med detta. Vi avgränsar oss alltså till ett antal ”goda exempel”, snarare än att ge en representativ bild av särredovisning i svenska kommuner. Vi fokuserar produktionen av kostnadsinformationen och analyserar inte konsekvenserna av att använda den.

    Kostnader särredovisas av olika anledningar. För att öka förståelsen av detta beskrivs tre situationer då kostnader för specifika kalkylobjekt efterfrågas: frågor internt från politiker och tjänstemän, frågor externt från myndigheter och andra granskande aktörer samt frågor från medborgare eller massmedia. Dessutom beskriver vi fem viktiga vägval som påverkar vilken precision som kan uppnås i särredovisningen. Dessa är hämtade från en tidigare rapport för Konkurrensverket (Olve och Petri, 2014), och handlar om hur kalkylobjekt definieras, hur data samlas in, vilket urval av kostnader som görs och hur samkostnader fördelas, samt hur kostnadsinformationen används.

    Resultaten visar att kommunerna kan göra avancerade kostnadskalkyler, men att sådana analyser är förknippade med resursanvändning bland såväl ekonomer som verksamhetspersonal. Om kostnadsinformationen inte är till nytta internt, kan det vara svårt att mobilisera intresse för att upprätta kalkylerna (i konkurrens med annan uppföljning som också efterfrågas). För kalkylobjekt som motsvarar konton i bokföringen, organisatoriska enheter eller leverantörer, kan fackekonomerna själva ta fram kostnadsinformation med hög precision. Men för mer verksamhetsnära kalkylobjekt (som produkter, processer och brukare) krävs ofta engagemang även från experter i verksamheten. Kostnadsinformationen som används internt ligger ofta till grund för styrningen och fokuserar därför ”påverkbara” kostnader snarare än full självkostnad. Utvecklingen mot större inslag av marknadslogik (så kallad New Public Management/NPM) har också påverkat uppföljningen. Gradvis har politikens och beställarnas fokus flyttats från kostnader i verksamheten, till det pris som betalas för den upphandlade verksamheten – oavsett om den levereras av en extern leverantör eller av den interna utförarorganisationen.

  • Blehr, Barbro
    Stockholm University, Faculty of Humanities, Department of Ethnology, History of Religions and Gender Studies, Ethnology.
    Om den svenska folkkyrkans samtida utmaningar2016In: Saga och sed: Kungl. Gustav Adolfs Akademiens årsbok, ISSN 0586-5360, 51-93 p.Article in journal (Refereed)
  • Andrade, Pedro
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Veljkovic, Milan
    Delft University of Technology.
    Simoes, Rui
    University of Coimbra.
    Lundholm, John
    Part Construction AB.
    Innovative system for the construction and management of student resisdences: Frameup system2016In: 19th IABSE Congress Report Stockholm 2016 / [ed] IABSE, 2016Conference paper (Refereed)
    Abstract [en]

    Sweden has a strong demand on the construction of student accommodations and consequently significant efforts have been taken to increase and streamline construction methods. In addition, the fluctuation on the number of students admitted at each year, in each university, lead to periods of house shortage or, in opposition to that, to eventual surplus on the housing market. For these reasons urges finding a fast execution process in construction to fulfil the market needs, together with a housing mechanism of control which balances the students’ needs with the housing availability. In this sense, the Frameup system arises as a solution to solve both problems by combining a modular construction with an innovative execution process.

    The FRAMEUP buildings uses a steel frame in combination with prefabricated 3D modules - fully equipped and suitable for student accommodations – which are assembled by starting from the roof to the 1st floor. The existence of the lifting system permits the erection of the building, promoting each time the building is lifted, a clearance of one-floor-height, at ground level, for the assembly of a new floor. The procedure is repeated several times, according to the number of floors, until the 1st floor of the building, the last floor of the execution sequence, is assembled.

    Alongside with its advantage on the fast execution, the Frameup system allows to efficiently increase or decrease the number of the floors and consequently its exchangeability with other buildings of same nature. Thus, assuming a net of FRAMEUP buildings at each university, its exchangeability system would create the necessary conditions so that the number of floors at each campus would follow the fluctuations of the students’ population among the different universities on different periods of time, so to suppress the needs for housing or to avoid the surplus on construction.

  • Reimegård, Johan
    et al.
    Kundu, Snehangshu
    Pendle, Ali
    Irish, Vivian F
    Shaw, Peter
    Nakayama, Naomi
    Sundström, Jens F
    Emanuelsson, Olof
    KTH, School of Biotechnology (BIO), Gene Technology.
    Genome-wide identification of physically clustered genes suggests chromatin-level co-regulation in male reproductive development in Arabidopsis thaliana2017In: Nucleic Acids Research, ISSN 0305-1048, E-ISSN 1362-4962Article in journal (Refereed)
  • Anxo, Dominique
    et al.
    Linnaeus University, School of Business and Economics, Department of Economics and Statistics.
    Ericson, Thomas
    Linnaeus University, School of Business and Economics, Department of Economics and Statistics.
    Herbert, Anna
    Linnaeus University, Faculty of Health and Life Sciences, Department of Psychology.
    Rönnmar, Mia
    Lund University.
    To stay or not to stay. That is the question: beyond retirement: Stayers on the labour market2017Report (Other academic)
    Abstract [en]

    The research project addresses three main questions: Who are the persons that continue to work after “normal” retirement age? What are their motivations? What are the consequences for the individual and for society? To answer these questions we perform an analysis of external and internal factors affecting the choice to stay after 65 years on the labour market or to leave earlier. Among external factors we investigate are: The impact of the prevailing labour laws and regulations on senior citizens’ participation on the labour market ; The socio-economic factors that affect the likelihood to stay on the labour market after the age of 65 ; The impact of employers’ human resource strategies on the possibility for senior workers to remain on the labour market after the age of 65 years. We also analyse the the role of individ specific factors such as motivation and , personal traits but the outcome in terms of subjective well-being and health. 

  • Criaco, Guiseppe
    et al.
    RSM Erasmus University, Rotterdam, Zuid-Holland, Netherlands.
    Sieger, Philipp
    Department of Management and Entrepreneurship, University of Bern, Switzerland.
    Wennberg, Karl
    Department of Management and Organization, Stockholm School of Economics, Sweden.
    Chirico, Francesco
    Jönköping University, Jönköping International Business School, JIBS, Business Administration. Jönköping University, Jönköping International Business School, JIBS, Center for Family Enterprise and Ownership (CeFEO).
    Minola, Tommaso
    Università degli studi di Bergamo, Italy.
    Parents' performance in entrepreneurship as a "double-edged sword" for the intergenerational transmission of entrepreneurship2017In: Small Business Economics, ISSN 0921-898X, E-ISSN 1573-0913Article in journal (Refereed)
    Abstract [en]

    We investigate how perceived parents’ performance in entrepreneurship (PPE) affects the entrepreneurial career intentions of offspring. We argue that while perceived PPE enhances offspring’s perceived entrepreneurial desirability and feasibility because of exposure mechanisms, it weakens the translation of both desirability and feasibility into entrepreneurial career intentions due to upward social comparison mechanisms. Thus, perceived PPE acts as a double-edged sword for the intergenerational transmission of entrepreneurship. Our predictions are tested and confirmed on a sample of 21,895 individuals from 33 countries. This study advances the literature on intergenerational transmission of entrepreneurship by providing a foundation for understanding the social psychological conditions necessary for such transmission to occur.

  • Recensioner2005In: Sociologisk forskning, ISSN 0038-0342, Vol. 42, no 2, 70-77 p.Article, book review (Other academic)
  • Engdahl, Emma
    Göteborgs universitet.
    Klarläggande2005In: Sociologisk forskning, ISSN 0038-0342, Vol. 42, no 2, 66-67 p.Article in journal (Other academic)