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  • Kundu, Arghya
    et al.
    Lexmark International Pvt. Ltd. Kolkata, India.
    Kundu, Arghya
    Lexmark International Pvt. Ltd. Kolkata, India.
    Laha, Sougata
    School of Computer Engineering Nanyang Technological University, Singapore.
    Vasilakos, Athanasios
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Correlation-based genetic algorithm for real-parameter optimization2016In: 2016 IEEE Congress on Evolutionary Computation (CEC), Piscataway, NJ, 2016, 4804-4809 p.Conference paper (Refereed)
    Abstract [en]

    We propose a genetic algorithm (GA) by taking into account the correlation between the current best candidate with the other candidates in the population. In this paper we propose a new selection operator and in addition we have designed a prediction operator which works on an archive of selected candidates. We test our proposed algorithm on the problem definitions for the CEC 2014 special session and competition on single objective real-parameter numerical optimization.

  • Van Dal, Victor H.P.
    et al.
    Edge Hill University.
    Van Dal, Victor H.P.
    Edge Hill University.
    Wass, Malin
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Human Work Science.
    First And Second Language Learnability Explained by Orthographic Depth And Orthographic Learning: A 'Natural' Scandinavian Experiment2016In: Scientific Studies of Reading, ISSN 1088-8438, E-ISSN 1532-799XArticle in journal (Refereed)
    Abstract [en]

    Effects of orthographic depth on orthographic learning ability were examined in 10- to 13-year-old children who learnt to read in similar orthographies differing in orthographic depth, defined as consistency of grapheme-to-phoneme correspondences. Danish children who learnt to read a deep orthography underperformed their Swedish counterparts who acquired a shallow orthography on vocabulary, phonological working memory, orthographic learning ability, and a range of first-language (L1: Danish/Swedish) and second-language (L2: English as a foreign language) measures. Orthographic learning ability explained over and above vocabulary and phonological working memory the better performance of Swedish children in comparison with Danish children on L1 reading accuracy and fluency, spelling, and visual word familiarity. With respect to L2 learning, orthographic learning ability determined spelling and visual word familiarity over and above L2 vocabulary and phonological working memory. It is concluded that shallow orthographies promote orthographic learning ability more efficiently than deep orthographies.

  • Mukkavaara, Jani
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Industrilized and sustainable construction.
    Mukkavaara, Jani
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Industrilized and sustainable construction.
    Jansson, Gustav
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Industrilized and sustainable construction.
    Holmberg, Anton
    Veidekke Entreprenad AB.
    Sandberg, Marcus
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Industrilized and sustainable construction.
    Approach for Automated Planning Using 5D-BIM2016In: Proceedings of the 33rd CIB W78 Conference 2016, Oct. 31st-Nov. 2nd 2016, Brisbane, Australia, 2016Conference paper (Refereed)
    Abstract [en]

    Early planning decisions are usually dependent on time-demanding, manually produced cost estimations and schedules. There is a trend in the construction industry to use 5D-BIM to speed up these processes and automated approaches can be used to further improve effectiveness. This research aims to investigate how to create an automated 5D-BIM planning process when using industrialized building systems. We propose an approach that combines a BIM manual with predefined databases based on the building system and its properties. A case study at one of Scandinavia’s largest construction and property development companies was conducted where the presented approach was tested. The findings show that planning using 5D-BIM is possible to partially automate through our approach but that there are challenges for a fully automated process in the standardization required and assuring that the quality of data in each step is adequate.

  • Cupillard, Samuel
    et al.
    Cupillard, Samuel
    Aidanpää, Jan-Olov
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
    Influence of the thrust bearing on the natural frequencies of a72-MW hydropower rotor2016In: IAHR symposium on Hydraulic Machinery and Systems, 2016, 236Conference paper (Refereed)
    Abstract [en]

    The thrust bearing is an essential element of a hydropower machine. Not only does itcarry the total axial load but it also introduces stiffness and damping properties in the system.The focus of this study is on the influence of the thrust bearing on the lateral vibrations of theshaft of a 72-MW propeller turbine. The thrust bearing has a non-conventional design with alarge radius and two rows of thrust pads. A numerical model is developed to estimate naturalfrequencies. Numerical results are analyzed and related to experimental measurements of arunaway test.The results show the need to include the thrust bearing in the model. In fact, the vibrationmodes are substantially increased towards higher frequencies with the added properties fromthe thrust bearing. The second mode of vibration has been identified in the experimentalmeasurements. Its frequency and mode shape compare well with numerical results.

  • Wu, Zhenzeng
    et al.
    Department of Material Engineering , Fujian Agriculture and Forestry University, 350002, Fuzhou, Fujian.
    Wu, Zhenzeng
    Department of Material Engineering , Fujian Agriculture and Forestry University, 350002, Fuzhou, Fujian.
    Chen, Tingjie
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Huang, Daobang
    D epartment of Material Engineering , Fujian Agriculture and Forestry University, 350002, Fuzhou, Fujian.
    Wang, Wei
    D epartment of Material Engineering , Fujian Agriculture and Forestry University, 350002, Fuzhou, Fujian.
    Xie, Yongqun
    D epartment of Material Engineering , Fujian Agriculture and Forestry University, 350002, Fuzhou, Fujian.
    Wan, Hui
    Department of Forest Products, Mississippi State University, P. O. Box 9800, Starkville, MS 39759 - 9820 USA.
    Wang, Xiadong (Alice)
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Effect of PVDC on the Fire Performance of Ultra-Low Density Fiberboards (ULDFs)2016In: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 11, no 4, 8653-8663 p.Article in journal (Refereed)
    Abstract [en]

    Poly vinylidene chloride-vinyl chloride emulsions (PVDC) were added as a substitute for chlorinated paraffin (CP) in the preparation of ultra-low density fiberboards (ULDFs). The micromorphology and fire performance of ULDFs were investigated using a scanning electron microscope, limiting oxygen index instrument, and cone calorimeter. The results showed that PVDC specimens were coated with a regularly smooth film, while the distribution of CP inside CP specimens was uneven. The limiting oxygen index increased with the dosage of PVDC, then reached a plateau at 50 mL and 28%, slightly higher than CP specimens (27.3%). The peak of heat release rate, mean heat release rate, mean CO, and total smoke release of PVDC specimens was reduced 43.3%, 13.5%, 38.5%, and 51.5% lower than respective CP specimens, and with nearly the same total heat release (only 0.04 MJ/m2 higher). Thus, PVDC exhibited excellent heat-reducing and smoke-suppressing properties and could replace CP in ULDFs. 

  • Liu, Jinghong
    et al.
    College of Material Engineering, Fujian Agriculture and Forestry University.
    Liu, Jinghong
    College of Material Engineering, Fujian Agriculture and Forestry University.
    Chen, Tingjie
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering. College of Material Engineering, Fujian Agriculture and Forestry University.
    Xie, Yongqun
    College of Material Engineering, Fujian Agriculture and Forestry University.
    Wei, Qihua
    College of Material Engineering, Fujian Agriculture and Forestry University.
    Chen, Yan
    College of Material Engineering, Fujian Agriculture and Forestry University.
    Rao, Jiuping
    College of Material Engineering, Fujian Agriculture and Forestry University.
    Niu, Min
    College of Material Engineering, Fujian Agriculture and Forestry University.
    Wang, Xiaodong (Alice)
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Fire Performance of Ultra-Low Density Fiberboard (ULDF) with Complex Fire-Retardants2016In: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 11, no 4, 10261-10272 p.Article in journal (Refereed)
    Abstract [en]

    To clarify how the fire performance of ultra-low density fiberboard (ULDF) can be improved by complex fire-retardants, the limiting oxygen index (LOI) and microstructure of ULDFs with different additive amounts of complex fire-retardants was analyzed. The char yield, chemical bonding, and thermostability of ULDFs treated by different temperatures were also tested. Results showed that the LOI values and compactness of ULDFs were increased with increased amounts of fire-retardants. Three steps of char yield curves in control fiberboard (CF) and mixed fiberboard (MF) were apparent. The preliminary degradation in lignin and cellulose of CF occurred at 300 °C. The cellulose had completely decomposed at 400 °C, but in the case of MF, the lignin and cellulose were not completely decomposed at 400 °C. It was shown that there are different ways to improve the fire resistance of ULDF using boron, nitrogen-phosphorus, silica, and halogen-based fire-retardants. The fiberboard with silicium compounds had the lowest mass loss in three stages and total mass loss. Compared with CF, MF had a lower mass loss. Furthermore, the exothermic peak for MF at around 400.0 °C was decreased, indicating that the fire resistance of ULDF was improved by the complex fire-retardants. 

  • He, Guojing
    et al.
    Department of Civil Engineering and Mechanics, Central South University of Forestry and Technology.
    He, Guojing
    Department of Civil Engineering and Mechanics, Central South University of Forestry and Technology.
    Xie, Lan
    Department of Civil Engineering and Mechanics, Central South University of Forestry and Technology.
    Wang, Xiaodong (Alice)
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Yi, Jin
    Department of Civil Engineering and Mechanics, Central South University of Forestry and Technology.
    Peng, Lening
    Department of Civil Engineering and Mechanics, Central South University of Forestry and Technology.
    Chen, Zi'ang
    Department of Civil Engineering and Mechanics, Central South University of Forestry and Technology.
    Gustafsson, Per Johan
    Division of Structural Mechanics, Lund University.
    Crocetti, Roberto
    Division of Structural Mechanics, Lund University.
    Shear Behavior Study on Timber-Concrete Composite Structures with Bolts2016In: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 11, no 4, 9205-9218 p.Article in journal (Refereed)
    Abstract [en]

    The key point of design for timber-concrete composite structure is to ensure the reliability of shear connectors. This study examined the mechanical properties of bolt-type connectors in timber-concrete composite structures theoretically and experimentally. The theoretical study was based on the Johansen yield theory (European Yield Model). Push-out specimens with different bolt dimensions were tested to determine the shear capacity and slip modulus. According to the experimental results, bolts yielded without timber or concrete cracks when the stiffness of bolts was not very great. The shear capacity and slip modulus of the bolt connectors were directly proportional to the diameter of the bolt. The strength of concrete was found to significantly affect the shear capacity of bolt connectors. Comparison between the theoretical and the experimental shear strength results showed reasonable agreement. 

  • Abrahamsson, Lars
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
    Abrahamsson, Lars
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
    Optimal drift och dimensionering avbanmatningssystem: Slutrapport Elektraprojekt2016Report (Other academic)
  • Laury, John
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
    Laury, John
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
    Bollen, Math
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
    Abrahamsson, Lars
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
    Transient stability analysis of low frequency railway grids2016In: WIT Transactions on the Built Environment, ISSN 1746-4498, E-ISSN 1743-3509, Vol. 162, 213-223 p.Article in journal (Refereed)
    Abstract [en]

    This paper investigates the replacement of Rotary Frequency Converters(RFCs) with Static Frequency Converters (SFCs) in the Swedish synchronous-synchronous Railway Power Supply System (RPSS) operating at1623Hz. Thereis a need to investigate how such a system behaves when RFCs are partly replacedwith SFCs, as the SFCs do not have any physical inertia.Most of the transient stability studies published for synchronous-synchronousRPSS address the behaviour of a single RFC or SFC against an infinite bus.However, there are very few studies investigating a system with several RFCs,SFCs or a mix of both in the same converter station. This paper presents the resultsof a transient stability study with both RFCs and SFCs. The investigated casesconsist of faults at different locations, and present the results when an RFC isreplaced with an SFC in a converter station.

  • Jansson, Maria
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Jansson, Maria
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Testprocessen - struktur, effektivitet och stabilitet2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Denna studie behandlar testprocessen och vikten av att ta fram en dokumenterad sådan. I fokus ligger testarnas arbete på en IT-avdelning där man utvecklar interna system ämnade att hjälpa resten av verksamheten i deras dagliga arbete. Eventuella fel i dessa system bör upptäckas så tidigt som möjligt för att undvika onödiga kostnader och detta ansvar ligger till stor del hos testarna. Det är de som testkör systemen och undersöker om de möter kraven och fungerar som det är tänkt. Först när testarna godkänt systemet är det redo att lanseras till användarna. Resultatet av denna studie är en väldefinierad testprocess med tydliga steg att gå igenom innan, under och efter testarbetet. Processen kan testarna luta sig mot för att uppnå struktur, effektivitet och stabilitet i sitt arbete och det de levererar. 

  • Bodin, Ulf
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Bodin, Ulf
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Grane, Camilla
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Human Work Science.
    Lööw, Joel
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Human Work Science.
    Teknisk rapport BASIE: Bärbara sensorer för ökad personsäkerhet2016Report (Other (popular science, discussion, etc.))
    Abstract [sv]

    Industriella arbetsmiljöer utgör trots omfattande säkerhetsarbete fortfarande en risk för hälsa och välbefinnande för arbetstagarna. Moderna sensorer och tekniker möjliggör att upptäcka risker och olyckor i tid och därmed öka säkerheten inom industrier. Industriella miljöer utrustas idag ofta med vältäckande trådlösa kommunikationsnät som möjliggör positionering och kommunikation med sensorer som bärs av personal. Den här rapporten beskriver aktuella tillämpningar och tekniklösningar. Förstudien har inte identifierat någon särskild tillämpning som kraftfullt driver utveckling av bärbara sensorer för industriella miljöer. Däremot har ett flertal lovande tillämpningar hittats som för närvarande provas av industrier eller finns kommersiellt tillgängliga som tidiga produkter. Några initiativ kan stödja flera tillämpningar och/eller funktioner med samma arkitektur och hårdvara. Flera lösningar bygger på positionering och i viss mån kontextanpassning.

     

    För fortsatt arbete föreslås utvärdera tillämpningar såsom (1) insamling av information för bättre uppföljning och analys av tillbud och olyckor, (2) stöd för genomförande av säkerhetsförbättrande åtgärder, baserat på analys av tillbud/olycka eller av annan anledning, samt (3) automatisk larmning vid ensamarbete och/eller särskilt riskfyllt arbete. Som ansats för fortsatt arbete föreslås att (A) definiera en flexibel arkitektur som möjliggör tester med olika typer av sensorer för olika tillämpningar, och etablera ett sådant testsystem, (B) identifiera existerande system till vilka integration behövs, samt (C) definiera återanvändbara funktioner för att säkert skydda den personliga integriteten efter behov som styrs av aktuell tillämpning och överenskommelse med företrädare för personal (dvs. fackföreningar), samt (D) hitta tydliga och väl avgränsade tillämpningar som kan provas praktiskt i målmiljöer.

  • Becker, Tova
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering.
    Becker, Tova
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering.
    Etiska och moraliska dilemman vid hantering av personlig information.2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    I många tusen år har vad som anses vara etiskt försvarbart diskuterats. Allt fler perspektiv beaktas

    bland annat beroende på den tekniska utvecklingen. På senare tid har utvecklingen av de

    digitala medierna inneburit att personlig information värderas och hanteras på nya sätt. Tekniken

    innebär att nya möjligheter skapas samtidigt som det finns en risk att personlig information

    missbrukas. Detta kan påverka vad som är etiskt försvarbart.

    Detta arbete handlar om hur personlig information hanteras med hjälp av digital teknik. Det

    undersöks om användare av IT är medvetna om att deras personliga information samlas in,

    sprids och används för att skapa en mängd nya individuella tjänster. Det utforskas om denna

    hantering, samt de nya möjligheterna att individualisera tjänster, är något som skapar dilemma.

    Till sist sammanställs rekommendationer som framkommit under studien gällande

    vad enskilda individer kan göra om de vill minska riskerna för att personlig information missbrukas.

    Studien inleds med en litteraturgenomgång vilken belyser hur IT påverkat vårt samhälle samt

    hur personlig information hanteras med den nutida teknikens möjligheter.

    Det beskrivs bland annat:

     Hur företag samlar in användardata i bakgrunden utan att tydligt informera om det

     Att det finns profiler om oss alla

     Att den information vi får är anpassad till oss som individer

     Att personlig information finns lättillgänglig och sökbart för alla bland annat för arbetsgivare

    Etik och moral bör ligga till grund för alla resonemang som avser avgöra vad som är rätt och

    fel. Företagen har riktlinjer för hur de bör handla enligt etiska och moraliska principer. Det

    finns lagstiftning och regelverk som styr men informationshantering utvecklas snabbt och är

    global vilket gör situationen komplex. Tekniken utvecklas ofta snabbare än regelverket.

    Metoden för insamlande av empiri bestod av två delar. Primärdata samlades in via intervjuer

    och sekundärdata söktes via nätet och medier för att få aktuell data som underlag till intervjuerna.

    Intervjuerna genomfördes som semikonstruerade intervjuer där datorer användes som

    hjälpmedel för att exemplifiera data som fanns tillgänglig om respondenten. Den empiri som

    framkom från intervjuerna innehåller en bred beskrivning av ämnesområdet även om urvalsgruppen

    var liten. Insamlad data analyserades genom att notera och sammanställa svaren samt

    söka mönster och samband mellan olika teman i intervjun.

    Slutsatser sammanställdes vilka visar på att det finns oroväckande låg medvetenhet inom ämnesområdet.

    Slutsaterana innehåller också tre dilemman kopplade till hur den tekniska utvecklingen

    hanterar personlig information. Dessa är faktaresistens, kränkning av den personliga

    integriteten och utformning av lagar, avtal och normer. Sist sammanställs rekommendationer

    avsedda för de som vill minska riskerna med hantering av personlig information.

    I slutet diskuteras att det är först när allmänheten börjar reagera som en diskussion kan uppstå.

    Först då kan en eventuell förändring ske där en reglering som behandlar hur individer får beröras

    och hur tekniken får användas växer fram.

  • Johansson, Henrik
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics.
    Johansson, Henrik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics.
    Sellberg, Kristofer
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering.
    Ambient Air Quality in Parking Locations and how to Improve it2016Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This thesis has two major purposes: (1) to investigate the impact carshave on Particulate Matter (PM) level in a limited area and (2) to demonstratethrough Computational Fluid Dynamics (CFD) the possibility toclean a limited area of PM with a system installed on a car.This thesis was performed in collaboration with Volvo Car Corporation(VCC) at Torslanda, Göteborg. All experimental data was sampledat three occasions: 24th of February, 14th of March and 3rd of June andwere compared to similar recent studies for verication. Computer calculationwere conducted in July and August with experimental data asinitial conditions. ANSYS v16.0 Fluent Meshing and ANSYS v16.0 Fluentwere used as computational software to set up and calculate the problem.The result of the experiments shows that with increased number ofcars there is an increased value of PM. It also shows that a cars ventilationsystem can be used to collect small PM. Result from CFD derivationsdisplayed that a cleaning system mounted in a car will decrease number ofPM with 5-20% in 250 seconds in a closed domain and 4% in 135 secondsin a open domain.

  • Ujvari, Szerena - Krisztina
    Luleå University of Technology, Department of Engineering Sciences and Mathematics.
    Ujvari, Szerena - Krisztina
    Luleå University of Technology, Department of Engineering Sciences and Mathematics.
    Journal Bearing Friction Optimization2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Engine downsizing, improving fuel efficiency while satisfying the environmental legislations are one of the main driving forces in developing new solutions for passenger cars.Engine main bearings, are journal bearings which support the crankshaft and operate principally in full film lubrication. Defining the optimum design parameters of the bearings which can provide low friction and high durability for automobiles represents a multi-variable problem.Being the supporters of the main shaft driven by the internal combustion engine, main bearings are subjected to strenuous operating conditions. These include high loads and pressures amongst others. The trend in lubricant selection for these components is shifting towards choosing engine oils with lower viscosity to further reduce fuel consumption. Simultaneously with the shift in oil, new solutions for controlling the geometry and the topography on the micro-scale are becoming available. Three main bearing top layers plated on a conventional aluminum alloy containing tin and silicon were selected for the study. The top layers, one bismuth based and two newly developed polymer based, were investigated for their frictional and wear performance.In order to study experimentally the influence of different design parameters on bearing performance a test rig and a methodology was developed. The selected engine main bearings were tested in lubricated condition with two oils having different viscosity. Pre - and post test analysis of the shaft surface roughness was performed using white light interferometry. The wear performance of the bearings was measured both as mass loss and surface topography.The results suggest that the developed test rig can be used to simulate close to running condition testing. The measurement method and set up shows good consistency at a load of 2000 N, but indicates inconsistency in set up at 500 N.It is found that the newly developed engine main bearing top layers have promising frictional and wear performance, providing a reduction in friction by up to 20%.

  • Prpic, John
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Business Administration and Industrial Engineering.
    Prpic, John
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Business Administration and Industrial Engineering.
    Next Generation Crowdsourcing for Collective Intelligence2016Conference paper (Refereed)
    Abstract [en]

    New techniques leveraging IT-mediated crowds such as Crowdsensing, Situated Crowdsourcing, Spatial Crowdsourcing, and Wearables Crowdsourcing have now materially emerged. These techniques, here termed next generation Crowdsourcing, serve to extend Crowdsourcing efforts beyond the heretofore dominant desktop computing paradigm. Employing new configurations of hardware, software, and people, these techniques represent new forms of organization for IT-mediated crowds. However, it is not known how these new techniques change the processes and outcomes of IT-mediated crowds for Collective Intelligence purposes? The aim of this exploratory work is to begin to answer this question. The work ensues by outlining the relevant findings of the first generation Crowdsourcing paradigm, before reviewing the emerging literature pertaining to the new generation of Crowdsourcing techniques. Premised on this review, a collectively exhaustive and mutually exclusive typology is formed, organizing the next generation Crowdsourcing techniques along two salient dimensions common to all first generation Crowdsourcing techniques. As a result, this work situates the next generation Crowdsourcing techniques within the extant Crowdsourcing literature, and identifies new research avenues stemming directly from the analysis.

  • Stighäll, Daniel
    Luleå University of Technology, Department of Arts, Communication and Education, Music and dance.
    Stighäll, Daniel
    Luleå University of Technology, Department of Arts, Communication and Education, Music and dance.
    En bro av lego: Att improvisera i renässansstil  utan behov av originalkällor2016Conference paper (Other academic)
    Abstract [sv]

    Att improvisera i renässansstil utan behov av originalkällor

    Denna recital lecture består huvudsakligen i en praktisk metod att öva improvisation i renässansstil, utan behov av skriftliga källor. Metoden utformades i början av 2000-talet av den franske musikern William Dongois och är baserad på de olika italienska improvisationsmanualer som finns bevarade från mitten av 1500-talet till början av 1600-talet. Före utvecklingen av musiktryckarkonsten spreds och upprätthölls improvisationstraditionen genom muntlig tradering, vanligtvis inom musikerfamiljerna. En viktig aspekt med denna nutida övningsmetod som ska presenteras är att den också traderas på ett gehörsbaserat vis, vilket skiljer den från många andra tillvägagångssätt kopplade till rekonstruktionen av historisk musik. Presentationen leder fram till ett exempel på ett helt improviserat stycke. Därtill ges exempel på stycken från 1500-talet där dåtidens musiker har skrivit ut en fullständig ornamenterad version, ett så kallat diminutionsstycke. Dessa bevarade ”originalimprovisationer” fungerar som klingande förebilder i vår nutida improvisationsutövning och ger vägledning om hur det gjordes förr, samt vilka tekniska färdigheter som förväntades av en instrumentalist på 1500- och 1600- talen. Ett utökat användningsområde för denna improvisationsteknik är inom nutida musik. Sedan 2010 har jag, genom min ensemble Serikon, regelbundet samarbetat med nutida kompositörer i olika sammanhang och i några fall har denna improvisationsteknik inkorporerats i de nya verken (ett par inspelade exempel på detta kommer att presenteras vid presentationen). I mitt pågående doktorandprojekt i musikalisk gestaltning är tillämpningen av denna improvisationspraxis i nyskriven musik ett viktigt inslag, där jag vill prova och utveckla metoden för att se hur den kan användas i större omfattning.

  • Rasmussen, Thorkild Maack
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
    Rasmussen, Thorkild Maack
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
    Current trends in geophysical exploration for minerals2016Conference paper (Other academic)
  • Brethes, Anaïs
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
    Brethes, Anaïs
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
    Guarnieri, Pierpaolo
    GEUS.
    Rasmussen, Thorkild Maack
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
    Bauer, Tobias
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
    Geological Analysis of Aeromagnetic Data over the Blyklippen Lead-zinc Mine at Mesters Vig, Central East Greenland2016In: First Conference on Geophysics for Mineral Exploration and Mining: Near Surface Geoscience 2016, Barcelona, Spain, 4-8 September 2016, 2016Conference paper (Refereed)
  • Brethes, Anaïs
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
    Brethes, Anaïs
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
    Rasmussen, Thorkild Maack
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
    Guarnieri, Pierpaolo
    GEUS.
    Bauer, Tobias
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
    Mapping and characterization of Induced Polarization in airborne TEM data from central East Greenland: application of a Self-Organizing Map procedure2016Conference paper (Refereed)
    Abstract [en]

    nduced Polarization (IP) effects were observed in airborne Time Domain EM (TEM) data acquired in central East Greenland in the context of exploration for disseminated sulphides in a sedimentary basin. Some of the IP anomalies were targeted by drilling which revealed the absence of mineralization. In order to understand the possible causes of the IP effects we first identified them in the TEM data. IP indicators were extracted from the shape of the transient curves at every measurement location and were analysed by using a Self-Organizing Map (SOM) procedure. Results from K-mean clustering of the SOM are visualized on a geographical map showing the transient curves’ characteristics. Some of the clusters are clearly correlated with the geology whereas others merely reflect recordings below the noise level. In order to interpret the cause of the IP anomalies the airborne TEM data were inverted for the Cole-Cole parameters.

  • Hurtig, Angelica
    et al.
    Luleå University of Technology, Department of Health Sciences.
    Hurtig, Angelica
    Luleå University of Technology, Department of Health Sciences.
    Norberg, Cecilia
    Luleå University of Technology, Department of Health Sciences.
    Upplevelser av att leva med depression hos vuxna personer: En litteraturstudie2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Depression är en vanlig sjukdom i hela världen. I gruppen depressiva syndrom ingår en rad olika tillstånd, denna studie inriktar sig på egentlig depression och dystymi. Depression kan ses som ett kraftfullt fenomen som inte bara påverkar det psykiska välmående utan även det fysiska. Ökad kunskap om upplevelser av att leva med depression kan ge en bättre förståelse för individen. Syftet med denna kvalitativa litteraturstudie var att beskriva vuxna personers upplevelser av att leva med depression. En systematisk litteratursökning genomfördes i tre bibliografiska referensdatabaser. Sedan utfördes en relevansbedömning samt en kvalitetsgranskning, vilket resulterade i att nio vetenskapliga artiklar ingick i litteraturstudien. Artiklarnas resultat analyserades med en kvalitativ innehållsanalys som utfördes induktivt med ett manifest innehåll. Analysen resulterade i fem slutkategorier; att befinna sig på botten och inte känna igen sig själv, att inte längre orka det vardagliga livet, att ha svårt för sociala relationer, att behöva stöd och mötas av förståelse samt att finna nya sätt för att orka fortsätta leva. Slutsatsen var att vuxna personer med depression upplevde att hela deras liv påverkades negativt och livet kändes hopplöst. Att förmedla hopp har därmed en central roll i omvårdnaden av personer med depression. Vidare forskning bör fokusera på hur sjuksköterskan kan stödja personerna med depression i det praktiska omvårdnadsarbetet.

  • Elhami, Ehsan
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
    Elhami, Ehsan
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
    Ask, Maria
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
    Erlström, Mikael
    Geological Survey of Sweden.
    Mattsson, Hans
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Physical Properties of Core Samples from the Swedish Part of the Southern Baltic Sea: Implications for CO2 Storage2016In: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 97, 356-363 p.Article in journal (Refereed)
    Abstract [en]

    This paper presents the results from a series of physical measurements conducted on core samples from the Swedish part of the southern Baltic Sea. The samples consist of 16 Cambrian sandstone samples (potential reservoir rock) and 9 Ordovician limestone samples (potential caprock). The two rock types reveal contrasting properties; axial P-wave velocity and density for the sandstone samples are 3.14±0.95km/s and 2.26±0.12 gr/cm3, respectively while for the limestone samples they are 6.09±0.22km/s and 2.58±0.08 gr/cm3, respectively. The scatter of the evaluated properties indicates aleatory variability and epistemic uncertainty in the properties which can be better addressed by further tests on more samples.

  • Kûhn, Michael
    et al.
    GFZ German Research Centre for Geosciences.
    Kûhn, Michael
    GFZ German Research Centre for Geosciences.
    Ask, Maria
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
    Juhlin, Christopher
    Department of Earth Sciences, Uppsala University.
    Bruckman, Viktor J.
    Austrian Academy of Sciences.
    Kempka, Thomas
    GFZ German Research Centre for Geosciences.
    Martens, Sonja
    GFZ German Research Centre for Geosciences.
    Interdisciplinary Approaches in Resource and Energy Research to Tackle the Challenges of the Future2016In: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 97, 1-6 p.Article in journal (Refereed)
    Abstract [en]

    The Division Energy, Resources & the Environment (ERE) of the European Geosciences Union (EGU) provides an international platform for scientists from a wide range of fields with the common denominator that their research topics have high societal relevance. The ERE community develops approaches for the solution of global economic prosperity, environmental quality and political stability based on interdisciplinary research on adequate and reliable supplies of affordable energy and other resources in environmentally sustainable ways. This special issue presents contributions of the ERE division at the EGU General Assembly in 2016.

  • Johansson, Maria
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Human Work Science.
    Johansson, Maria
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Human Work Science.
    En företagshälsovård för byggbranschen: En kartläggning och analys av behov och förutsättningar2016Report (Other academic)
  • Sandin, Fredrik
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Sandin, Fredrik
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Martin del Campo Barraza, Sergio
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Dictionary Learning with Equiprobable Matching PursuitManuscript (preprint) (Other academic)
    Abstract [en]

    Sparse signal representations based on linear combinations of learned atomshave been used to obtain state-of-the-art results in several practical signalprocessing applications. Approximation methods are needed to processhigh-dimensional signals in this way because the problem to calculate optimalatoms for sparse coding is NP-hard. Here we study greedy algorithms forunsupervised learning of dictionaries of shift-invariant atoms and propose anew method where each atom is selected with the same probability on average,which corresponds to the homeostatic regulation of a recurrent convolutionalneural network. Equiprobable selection can be used with several greedyalgorithms for dictionary learning to ensure that all atoms adapt duringtraining and that no particular atom is more likely to take part in the linearcombination on average. We demonstrate via simulation experiments thatdictionary learning with equiprobable selection results in higher entropy ofthe sparse representation and lower reconstruction and denoising errors, bothin the case of ordinary matching pursuit and orthogonal matching pursuit withshift-invariant dictionaries. Furthermore, we show that the computational costsof the matching pursuits are lower with equiprobable selection, leading tofaster and more accurate dictionary learning algorithms.

  • Al Dahaan, Saadi
    et al.
    University of Kufa, Kufa, Iraq.
    Al Dahaan, Saadi
    University of Kufa, Kufa, Iraq.
    Al-Ansari, Nadhir
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Knutsson, Sven
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Influence of Groundwater Hypothetical Salts on Electrical Conductivity Total Dissolved Solids2016In: Engineering, ISSN 1947-3931, E-ISSN 1947-394X, Vol. 8, no 11, 823-830 p.Article in journal (Refereed)
    Abstract [en]

    A relationship between electrical conductivity (EC) and total dissolved solids (TDS) was tested for solutions of same salinity levels with respect to different artificial salts with their combinations. Results showed remarkable jumping at the order of the artificial salt sequence specially that of the magnesium type. A computer model is designed with an input of EC and TDS. The output will be the possible prevailing artificial salts. The accuracy of the model was tested by using the groundwater data of Safwan-Zubair area south of Iraq and it proved to be significant at 95% matching. The 5% unmatched results are due to the possibility of having more than one type of prevailing salt.

  • Exposito Garcia, Adrian
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering.
    Exposito Garcia, Adrian
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering.
    Investigation on Model Based Observers for SpaceStructure Load Characterization2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The experimental determination of dynamic characteristics of elastic structures, in particularof space flight related structures typically is performed by experimental modal analysis(EMA) or output-only modal analysis (OMA). This document is focused on the OMA methodsand state-space modelling, the motivation for this approach is the possibility to monitorthe real loading of a structure in order to provide a loading history which may be used foran assessment of safe remaining life once the dynamic characteristics has been determined. Previous work has demonstrated that Extened Kalman Filter is not sufficient in thecase when the forces are unkown and the only resource available are the responses of thestructure. In this research a new method called Unscented Kalman Filter is investigated andimplemented, proving its capability to obtain a better approximation of the elastic structurebehaviour and a correction of the modal parameters.

  • Persson, Magnus
    Luleå University of Technology, Department of Engineering Sciences and Mathematics.
    Persson, Magnus
    Luleå University of Technology, Department of Engineering Sciences and Mathematics.
    Thermo-Oxidative Degradation of High Temperature Polyimide Composites: Characterization and Modeling of Composites Affected by an Extreme Environment2016Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Carbon fiber (CF) 8-harness satin weave, T650/Neximid system of [(+45/-45)/(0/90)]2S and [(0/90)]4S layup was manufactured using resin transfer molding (RTM). The material was cut into 3-point bending specimens and treated for 24 hours in a burn oven at T=(320,350,375,400,450 & 500)°C. The material was tested according to ASTM E1640-13 using dynamic mechanical thermal analysis (DMTA). Un-treated material showed Tg levels of 384°C and 392°C for the respective layups. It was found that pre-Tg treatment between 320-375°C affected this material parameter up to similar levels as previous studies of post Tg exposure for 2h to ~420°C [4]. Subjecting the material for post-Tg exposure at 400°C showed a rapid change up to ~480°C for [(0/90)]4S laminate. Indications that this resin system could reach levels above 500°C was found for [(+45/-45)/(0/90)]2S layup. However, one of these specimens were unfit for testing. DMTA tested material for 400°C showed indications of degradation, found by a broadening of the tan delta peak. This can be put in relation to epoxy where a similar behavior appear after 24h exposure at 150°C. Furthermore, it was showed that poor quality laminate, elevated mass loss at this temperature. When the material was subjected to as high temperatures as 450°C only remaining fibers were found. At 500°C these were almost fully oxidized. 400°C data was predicted by the use of activation energy along with TG extrapolation. It was possible to show that ~1/8 out of this 8-layered structure, (½ of each surface layer), was degraded after 400°C exposure for 24h, resulting in diffusion limited oxidation (DLO). Last but not least, DLO assumptions was used to predict the storage modulus change for thermo-oxidative degradation of 400°C samples with Classic Laminate Theory (CLT). A ~4% stiffness decrease was predicted by this method. The drop is regarded as a loss in tensile stiffness of the outer damaged layer. This was compared by 3-point bending DMTA data showing a ~7% decrease. This model could thus be regarded as a contributing factor for the stiffness decrease of this complex degradation process. 

  • Tran, Anh Tuan
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Tran, Anh Tuan
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Lateral-torsional buckling resistance of cold-formed high strength steel rectangular hollow beams2016In: Insights and Innovations in Structural Engineering, Mechanics and Computation / [ed] Alphose Zingoni, Boca Raton: CRC Press, 2016Conference paper (Refereed)
    Abstract [en]

    Hollow sections have been widely used for steel structures. Applications of High Strength Steel (HSS) on cold-formed hollow sections lead to thinner and lighter structures. This paper presents numerical investigations on the lateral-torsional buckling resistance of the cold-formed high strength steel rectangular hollow beam. Results from finite element analysis using Abaqus software are compared to calculations accroding to Eurocode 3. First, buckling analyses are carried out to investigate buckling behaviors of the rectangular hollow beams. In this step, elastic critical moments have been investigated and compared to calculations according to SN003. Buckling shapes have been also obtained in this step. Secondly, nonlinear analyses using Riks method have been performed. Buckling resistances of the beams with various thicknesses, various high strength materials S460, S650 and S960 have been compared to calculations according to EC 3. Further investigations on geometric imperfection sensitive have been carried out with different amplitudes L/1000, L/750, L/500 and L/250.

  • Pettersson, Anna
    Luleå University of Technology, Department of Health Sciences.
    Pettersson, Anna
    Luleå University of Technology, Department of Health Sciences.
    Uppfattningar om bålstabilitet samt upplevelse av att träna bålstabilitet i grupp hos personer med ländryggssmärta2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Background: Low back pain is a common problem with consecuences for both comunity and individual. For the individual the pain can give limitations i function and activity and is often correlated with different levels of fear of movement. Clinical guidelines for low back pain recommends individualized exercise and that relevant explainations are given to the patient. There are previous studies that quantitatively evaluates training directed towards corestability and motor control and these show that the interventions gives effects on outcomemeasures such as pain and function. This study provides a qualitative description of how patients experience the concept of corestability and training of corestability in a group.

    Aim: To describe how people with low back pain experience the concept of corestability and their experience to train corestability in a group.

    Methodology: To answer the purpose a qualitative method was chosen. Ten people whom had participated in a corestabilizing traininggroup were interviewed. The interviewmaterial was analyzed using content analysis.

    Results: The informants experience of the concept of corestability is to have good strong muscles in the back and abdomen and also good control over the local small abdominal muscles. This leads to improved ability in postural- and movementactivities and can prevent or treat pain. This study shows that training in a group where there is a committed leader that provides individualized introduction and feedback and that notice all participants is positive for the experience of training and provides increased motivation. For the participants to achieve their own knowledge about the training they wish for individualized feedback throughout the learningprocess. Corestabilitytraining in a group gives an experience of improvement and increased awareness and trust in ones back and ones ability.

    Conclusion: The study confirms clinical experience of positive impact of groupexercise and shows that groupexercise is applicable although stabilitytraining requires individualised feedback.

  • Vestman, Catrin
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
    Vestman, Catrin
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
    Trafiksäkerhet och trygghet på övergångsställen i Luleå centrum: Äldre fotgängares perspektiv2016Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Luleå kommun (2008) har en vision om att år 2050 ska det dagliga livet gå att klara utan egen bil och det ska vara möjligt för alla att säkert ta sig fram kollektivt eller till fots. Samtidigt visar många studier på att fotgängare står för ca en tredjedel av alla som skadas i trafiken och är därmed den mest utsatta gruppen i trafiken (bland annat Öberg 2011 och Nilsson 1986). Den officiella statistiken i Sverige, som rapporterats från polisen, exkluderar singelolyckor för fotgängare då det inte anses vara en vägtrafikolycka då inget fordon varit inblandad (Trafikverket 2016). Det finns även ett stort mörkertal i registreringen och troligen redovisas endast 35-50 % av det faktiska antalet trafikskadade personer i landet (Vägverket 2007). Åtgärder och utredningar sker konstant i landet och antalet olyckor minskar för varje år, men inte i utsträckning för att nå nollvisionen inom en snar framtid (Larsson 2009).

    Många studier visar på att personer över 65 år löper stor risk att omkomma i trafiken på grund av att de är skörare och mindre toleranta mot krockvåldet (Vägverket konsult 2007). Av dödsfallen för fotgängare har 66 skett på eller i närheten av övergångsställen (Larsson 2009). Två av tre som omkommer på övergångställen är 65 år eller äldre (Vägverket konsult 2007). Åldersgruppen 65 år och äldre utgör 19-20 % av befolkningen, vilket motsvarar närmare 1,9 miljoner personer (Brundell 2014).

    Det är sedan länge känt att den bebyggda miljön påverkar vårt sätt att röra oss, men hur påverkar den vår säkerhet och upplevda trygghet? Detta utreds genom att studera olycksstatistiken för fotgängare från Strada med dels avgränsning Luleå centrum och dels med avgränsning kring 6 övergångsställen i Luleå centrum – som även utreds via en gåtur och via platsinventering. Olycksstatistiken från Strada ger en inblick i säkerheten för fotgängare medan gåturen ger en inblick i äldre fotgängares säkerhet och upplevda trygghet. Platsinventeringen beskriver den bebyggda miljön och dessa fyra olika metoder ger slutligen en indikator på faktorer i den bebyggda miljön som påverkar säkerheten och tryggheten på övergångsställen i Luleå centrum.

    De flesta fotgängarolyckor som rapporterats i Luleå centrum under perioden 2003-2014 berodde på ojämn terräng och dålig sikt för fordonsförarna i fordonet som de blev påkörda av. De faktorer som främst påverkar säkerheten och tryggheten för fotgängare på de 6 övergångsställen som undersökts i detta arbete är hastigheten på övriga trafikslag, belysningen, sikten, uppmärksamheten av fordon och vägunderlaget/terrängen. Resultatet från gåturen visar på att människors närvaro inte har så stor påverkan på den upplevda tryggheten. Belysningen från busshållplatser och affärer har desto större påverkan på tryggheten. Däremot upplevde många att andra människor bidrar till en ökad uppmärksamhet från fordon, vilket minskar risken att bli påkörd, dvs. ökar säkerheten. Deltagarna ansåg att separeringen av cyklister och gående bidrog till en tryggare känsla, men där framkomligheten för cyklister var prioriterade hade cyklisterna för höga hastigheter vilket gav motsatt effekt för säkerheten och tryggheten för fotgängarna.

  • Chiaraviglio, Luca
    et al.
    CNIT, Italy.
    Chiaraviglio, Luca
    CNIT, Italy.
    Blefari-Melazzi, Nicola
    CNIT, Italy.
    Liu, William
    AUT, New Zealand.
    Gutierrez, Jairo A.
    AUT, New Zealand.
    van de Beek, Jaap
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Birke, Robert
    IBM Research, Switzerland.
    Chen, Lydia
    IBM Research, Switzerland.
    Idzikowski, Filip
    Faculty of Electronics and Telecommunications, Poznan University of Technology.
    Kilper, Daniel
    The University of Arizona.
    Monti, Paolo
    KTH Royal Institute of Technology.
    Wu, Jinsong
    University of Chile.
    5G in rural and low-income areas: Are we ready?2016In: Proceedings of the 8th ITU Kaleidoscope academic conference: ICTs for a Sustainable World, 2016Conference paper (Refereed)
  • Lööw, Joel
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Human Work Science.
    Lööw, Joel
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Human Work Science.
    Web-based safety training for contractors2016Conference paper (Other academic)
  • Neyses, Benedeikt
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Neyses, Benedeikt
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Sandberg, Dick
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    A new method to select wood species suitable for surface densification2016In: BIOCOMP 2016: The 13th Pacific Rim Bio-Based Composites Symposium : Bio-based composites for a sustainable future., Concepción: University of Concepción , 2016, 96- p., PT04Conference paper (Refereed)
  • Couceiro, José
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Couceiro, José
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Neyses, Benedeikt
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Sandberg, Dick
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    In-situ moisture content and density measurements in surface densified wood using dual X-ray absorptiometry in medical CT-scanning2016In: BIOCOMP 2016: The 13th Pacific Rim Bio-Based Composites Symposium, Bio-based composites for a sustainable future., Concepción: University of Concepción , 2016, Vol. 2, 92- p., NA01Conference paper (Refereed)
  • Couceiro, José
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Couceiro, José
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Sandberg, Dick
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    The use of X-ray computed tomography in bio-composite research2016In: BIOCOMP 2016: The 13th Pacific Rim Bio-Based Composites Symposium : Bio-based composites for a sustainable future,, Conceptión: University of Concepción , 2016, 42-45 p.Conference paper (Refereed)
    Abstract [en]

    X-ray computed tomography (CT), which was introduced in the medical field in the early 1970s, is also a powerful tool for the non-destructive measurement of dynamic processes in wood. For more than 20 years, medical CT has been used in wood research at Luleå University of Technology. The uniqueness of the CT equipment allowsprocesses such as drying, modification; water absorption; internal and external cracking; and material deformation to be studied in temperature- and humidity-controlled environments. The data recorded by the CT scanner during the process is converted into two or three dimensional images that, for instance, can show dynamic moisture behaviour in wood drying and crack formation. This paper provides an overview of the possibilities of using CT in bio-composite research, and shows examples of applications and results that can be particularly difficult to achieve using other methods. A specific focus is on studies on wood products that use combinations with materials such as metal and especially about how to deal with the difficulties that this entails.The practical application of the result is that CT scanning, combined with image processing, can be used for non-destructive and non-contact three-dimensional s tudies of exterior construction elements during water sorption and desorption, to study parameters such as swelling and shrinking behaviour; delamination phenomena; and crack development.

  • Jullander, Sverker (Musician)
    Luleå University of Technology, Department of Arts, Communication and Education, Music and dance.
    Jullander, Sverker (Musician)
    Luleå University of Technology, Department of Arts, Communication and Education, Music and dance.
    Westberg, Erik (Musical director)
    Luleå University of Technology, Department of Arts, Communication and Education, Music and dance.
    Kjekshus, Helge (Musician)
    Luleå University of Technology, Department of Arts, Communication and Education, Music and dance.
    Kör- och orgelkonsert2016Other (Other academic)
    Abstract [sv]

    Konsert i Vasakyrkan, Göteborg, med orgelverk av Max Reger (Introduktion och passacaglia d-moll, Fantasi över koralen "Wachet auf, ruft uns die Stimme") samt körverk av Max Reger (Drei Chöre op. 6, O Tod wie bitter bist du op. 110:3), Peter Cornelius (Liebe op. 18) och Johannes Pollak (O Tod).

    Medverkande:

    Erik Westbergs vokalensemble

    Erik Westberg, dirigent

    Sverker Jullander, orgel

    Konserten ingick i Dagar kring musik av Max Reger, arr. Svenska kyrkan i Göteborg, Vasa församling, i samarbete med Göteborgs internationella orgelakademi och Högskolan för scen och musik, Göteborgs universitet. Konserten framfördes den 19 november 2016. 

  • Jullander, Sverker (Musician)
    Luleå University of Technology, Department of Arts, Communication and Education, Music and dance.
    Jullander, Sverker (Musician)
    Luleå University of Technology, Department of Arts, Communication and Education, Music and dance.
    Organ Concert in Memory of Jacques van Oortmerssen2016Other (Other academic)
    Abstract [en]

    Organ recital 9 September 2016 at 20:00, within Göteborg International Organ Academy. The concert was held in memory of the distinguished organist, scholar and pedagogue Jacques van Oortmerssen, Amsterdam.

    The performing organ soloists were: Joel Speerstra, Hans-Ola Ericsson, Karin Nelson, Sverker Jullander, Magnus Kjellson, and Hans Davidsson.

  • Teng, Ziyan
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
    Teng, Ziyan
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
    Larsson, Sofia
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
    Lundström, Staffan
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
    Marjavaara, Daniel
    Luossavaara-Kiirunavaara AB.
    Computational Fluid Dynamics Modelling of Flow Field in a Simplified, Down-scaled Rotary Kiln Model2016Conference paper (Other academic)
  • Petersen, Nadja
    Luleå University of Technology, Department of Health Sciences, Health and Rehab.
    Petersen, Nadja
    Luleå University of Technology, Department of Health Sciences, Health and Rehab.
    Relation mellan bål- och axelrörlighet hos elitspelande tennisjuniorer2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Abstract

    Background: Repeated movements and sustained postures in daily activity, work and in sports can influence the neuromusculoskeletal system. Repeated changes in posture and movement might cause local stress in the tissue. Adaptive effects in the mobility of the shoulder in tennis players and other overhead athletes are well documented in the literature. Research of trunk mobility and its effect on the shoulder is limited.

    Aim: The aim of this study was to investigate trunk rotation, glenohumeral rotation and the correlation between trunk rotation and glenohumeral rotation in elite junior tennis players 16-19 years old. Secondly, to identify athletic adaptations in trunk rotation and glenohumeral rotation in elite junior tennis players.

    Methods: Range of motion in the glenohumeral joint for internal and external rotation was measured with a clinometer on a smartphone. Range of motion for trunk rotation was measured with seated rotation test with a goniometer placed at T2. The participants were 32 elite junior tennis players and the control group was 30 elite junior soccer players aged 16-19 years old. Descriptive statistics for range of motion in shoulder and trunk rotation was presented. Differences between tennis players and control group were analyzed. Correlation between trunk rotation and internal and external rotation was analyzed.

    Results: Trunk rotation to the non dominant side had lower scores in tennis players than in soccer players. No obvious correlation was detected between shoulder rotation and trunk rotation.

    Tennis players had less internal rotation and total rotation range of motion (TROM) in their dominant arm compared to the control group.  This reduction in internal rotation and TROM increased with age.

    Conclusion: There are some indications for adaptive changes in tennis players with reduced trunk rotation to the non dominant side and reduced internal rotation in the dominant shoulder.

  • Myhr, David (Singer, Musician)
    Luleå University of Technology, Department of Arts, Communication and Education, Music and dance.
    Myhr, David (Singer, Musician)
    Luleå University of Technology, Department of Arts, Communication and Education, Music and dance.
    The Beatles LP Revolver 50 år, Lasse i Parken, Stockholm2016Other (Other academic)
    Abstract [en]

    David Myhr & Two of Us played their favorite Beatles songs at the event The Beatles LP Revolver 50 years held in Stockholm July 15 2016. Myhr was a guest artist playing guitar, piano and performing as a vocal soloist on "Here there and everywhere", "Good Day Sunshine", "And your bird can sing", "Rain" and "Back in the USSR". The event was arranged by Thorells Syndrom, Beatles Information Center, and Lasse i Parken.

  • Troedson, Per
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
    Troedson, Per
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
    Östlund, Anna
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
    Lokal brand i hyllställningar: En metodutvärdering för beräkning av temperaturer2016Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Moderna byggnader kan ställa krav på komplicerade brandtekniska lösningar eftersom de kan vara komplexa och inte bestå av konventionella arkitektoniska byggnadsdelar. De stora komplexa byggnaderna kan medföra att brandförhållandena i byggnaden avviker signifikant från de förhållanden som ligger till grund för de traditionella dimensioneringsmetoderna.

    När dimensionering av komplexa byggnader inte genomförs med traditionella dimensioneringsmetoder, såsom naturliga eller nominella brandförlopp, kan lokal brand eller avancerade brandmodeller användas. Storleken på den lokala branden som används vid dimensionering kan beräknas enligt Eurokod 1 appendix C där appendix E ska användas för att beräkna brandintensiteten. EKS 10 åberopar att appendix E inte får användas utan istället ska brandintensiteten bestämmas genom Boverkets allmänna råd om brandbelastning (BBRBE).

    Syftet med arbetet var att studera dimensionerande brand vid tillämpning av lokal brand i hyllställningar där brandintensitet, hyllställningens dimensioner och lagringssätt varieras. De temperaturer som uppkommer i brandens centrumlinje var av intresse att undersöka eftersom förhöjda temperaturer kan påverka bärförmågan i bärverket. Målet med arbetet var att tillhandahålla en komplett metod för dimensionerande brand i livsmedelsbutiker. Två metoder tillhandhölls och de utvärderades mot en tredje beräkningsmetod samt mot flödesberäkningskoden FDS för att tydliggöra vilken av de tre handberäkningsmetoderna som var mest lämplig att använda vid beräkning av temperaturer vid lokal brand.

    Arbetet har utgått från en typisk hyllställning från ett tidigare arbete som har modellerats i FDS. Dimensionerna på den typiska hyllställningen har varierats i arbetet, där fyra olika bredder och höjder har använts. I hyllställningarna har bränslepaket modellerats och ska motsvara en antagen bränslekonfiguration med varierande brandintensitet. Det resulterade i att 36 scenarier simulerades i FDS i 300 sekunder där antändningen var momentan. Från resultaten kunde två nya beräkningsmetoder tillhandahållas, förenklad faktormetod (FFM) och partialkoefficientmetoden (PKM). De två metoderna utvärderades mot den tidigare Ludvigsson-Rydstedts metod (LRM) samt FDS i fallstudier. Fallstudierna genomfördes på tidigare tillhandahållen data samt från en FDS simulering över ett helt brandförlopp från detta arbete.

    Slutsatser som erhållits utifrån resultaten och de framtagna beräkningsmetoderna är:

    • Av hyllställningens bredd, höjd och brandintensiteten är bredden den parameter som påverkar de beräknade temperaturerna mest vid lokal brand i hyllställning.

    • De temperaturer som uppkommer vid lokal brand i hyllställning påverkas av både brandeffekten från en hyllställning samt brandintensiteten på bränslepaketens ytor.

    • Vid lokal brand i hyllställning kan bärverk påverkas eftersom de uppkomna temperaturerna i några scenarier översteg den kritiska temperaturen för stål.

    • Appendix C i Eurokod 1991-1-2 kan anpassas till brand i hyllställningar om hänsyn tas till brandens startpunkt samt projicerad brandeffekt.

    • 2/3 av hyllställningens höjd är mest lämplig att använda som starthöjd för branden i de framtagna metoderna.

    Generellt visade metodutvärderingen att LRM gav temperaturer som var konservativa i förhållande till FDS. PKM gav temperaturer som stämde överens med temperaturerna från FDS medan FFM gav något lägre temperaturer jämfört med PKM.

  • Ihanus, Harri (Musician, Speaker)
    Luleå University of Technology, Department of Arts, Communication and Education, Music and dance.
    Ihanus, Harri (Musician, Speaker)
    Luleå University of Technology, Department of Arts, Communication and Education, Music and dance.
    Muusikkojen yhteispeli (Musikers samspel): Kulturdiskussion i radioprogrammet "Koukku" producerat av Sisu Radio, Sveriges Radio2015Other (Other academic)
    Abstract [fi]

    Kulturdiskussion samt musikframförande med musikerna Harri Ihanus, Lauri Antila och Tuomas Ojala på temat "samspel hos musiker" producerat av den finska redaktionen Sisuradio på Sveriges Radio. Produktionen sändes den 18 oktober 2015.

  • Ihanus, Harri (Musician)
    Luleå University of Technology, Department of Arts, Communication and Education, Music and dance.
    Ihanus, Harri (Musician)
    Luleå University of Technology, Department of Arts, Communication and Education, Music and dance.
    Från ballader till bebop & blues: Harri Ihanus och Hans Backenroth på Ekebyhovs slott 8/2 20152015Other (Other academic)
    Abstract [sv]

    Konsert på Ekebyhovs slott den 8 februari 2015. 

    Medverkande:

    Harri Ihanus

    Hans Backenroth

  • Ihanus, Harri (Musician)
    Luleå University of Technology, Department of Arts, Communication and Education, Music and dance.
    Ihanus, Harri (Musician)
    Luleå University of Technology, Department of Arts, Communication and Education, Music and dance.
    Gitarrfrossa i Bossa Nova takt: Konsert av Nelson Faria, Harri Ihanus och Rodolfo Cardoso2016Other (Other academic)
    Abstract [sv]

    Jazzkonsert i Brukskyrkan, Fagersta den 18 april 2016. 

    Medverkande:

    Faria Nelson - gitarr

    Harri Ihanus - gitarr

    Rodolfo Cardoso

    Repertoar:

    Blue Bossa (K Dorham)

    All The Things You Are (Kern/Hammerstein)

    Corcovado (A C Jobim)

    Tenor Madness (S Rollins)

    Wave (A C Jobim)

    One Note Samba (A C Jobim)

    Days Of Wine And Roses (Mancini/Mercer)

    How Insensitive (A C Jobim)

    The Girl From Ipanema (A C Jobim)

    Arrangör: Föreningen Jazzligan, Västmanlandsmusiken, Fagersta Kommun, Västervåla Församling.

  • Ihanus, Harri (Musician)
    Luleå University of Technology, Department of Arts, Communication and Education, Music and dance.
    Ihanus, Harri (Musician)
    Luleå University of Technology, Department of Arts, Communication and Education, Music and dance.
    Jazzkonsert med Jan Allan, Harri Ihanus, Svante Söderqvist, Bengt Stark på Lindgården i Fagersta: Arrangör Jazzligan, Västmanlandsmusiken, Fagersta kommun, Västanfors-Västervåla församling2016Other (Other academic)
    Abstract [sv]

    Jazzkonsert i Lindgården, Fagersta den 11 oktober 2016. 

    Jan Allan - trumpet

    Harri Ihanus - gitarr

    Svante Söderqvist - bas

    Bengt Stark - trummor

    Arrangör: Jazzligan, Västmanlandsmusiken, Fagersta kommun, Västanfors Västervåla församling.

  • Ihanus, Harri (Musician)
    Luleå University of Technology, Department of Arts, Communication and Education, Music and dance.
    Ihanus, Harri (Musician)
    Luleå University of Technology, Department of Arts, Communication and Education, Music and dance.
    Konsert Claes Janson, Harri Ihanus, Hans Backenroth, Jocke Ekberg: Jazzclub Trappan, Vällingby 29/3 20162016Other (Other academic)
    Abstract [sv]

    Konsert på Jazzclub Trappan den 29 mars 2016. 

    Medverkande:

    Claes Janson - sång

    Harri Ihanus - gitarr

    Hans Backenroth - bas

    Jocke Ekberg - trummor

    Arrangör: ABF och Medborgarhuset Trappan.

  • Ihanus, Harri (Musician)
    Luleå University of Technology, Department of Arts, Communication and Education, Music and dance.
    Ihanus, Harri (Musician)
    Luleå University of Technology, Department of Arts, Communication and Education, Music and dance.
    Jazzkonsert med Ludvig Berghe2016Other (Other academic)
    Abstract [sv]

    Jazzkonsert i Pelarsalen, annext, Vällingby backe den 16 februari 2016. 

    Medverkande:

    Ludvig Berghe - piano

    Harri Ihanus - gitarr

    Hans Backenroth - bas

    Bengt Stark - trummor

    På konserten framfördes följande musik skriven av Ludvig Berghe:

    Worldwide Welcome

    Lewis Engineered

    Knock, Knock!

    Luccas Groove

    Ruby Slippers

    Carnival

    Samt; You´re My Everything (H Warren), Sweet Lorraine (M Parish/C Burwell), One Note Samba (A C Jobim), Over The rainbow (H Arlen)

    Arrangör: ABF och Medborgarhuset Trappan. 

  • Ihanus, Harri (Musician)
    Luleå University of Technology, Department of Arts, Communication and Education, Music and dance.
    Ihanus, Harri (Musician)
    Luleå University of Technology, Department of Arts, Communication and Education, Music and dance.
    Nelson Faria och Harri Ihanus på Glenn Miller Café: En konsert2016Other (Other academic)
    Abstract [sv]

    Konserten framfördes på Glenn Miller Café i Stockholm den 17 april 2016. 

    Medverkande:

    Nelson Faria

    Harri Ihanus

    Nelson Faria och Harri framförde följande repertoar:

    Body & Soul (J Green)

    Bluesette (T Thielman)

    Autumn Leaves (J Kosma)

    Wave (A C Jobim)

    How Insensitive (A C Jobim)

    Chega De Saudade (A C Jobim)

    Tenor Madness Two Sonny Rollins)

    Corcovado (A C  Jobim)

  • Eriksson, My
    et al.
    Luleå University of Technology, Department of Health Sciences.
    Eriksson, My
    Luleå University of Technology, Department of Health Sciences.
    Grönlund, Erika
    Luleå University of Technology, Department of Health Sciences.
    "Kommer vi aldrig ses mer" Hur vårdpersonal kan stödja barn till en förälder i livets slut2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    I livet är sjukdom och död oundviklig och oförutsägbar. När en familjemedlem drabbas av en allvarlig eller livshotande sjukdom innebär det omställningar för familjen. Att förlora en förälder är ett av det mest traumatiska ett barn kan uppleva och det kan påverka många områden och perioder i barnets liv. Syftet var att undersöka hur vårdpersonal kan stödja barn som har en förälder i livets slutskede. För att besvara syftet och de specifika frågeställningarna genomfördes en integrerad litteraturstudie där 14 stycken vetenskapliga studier analyserades. Varje frågeställning besvarades med en syntes. Resultatet visade att barn har ett stort behov av stöd då de upplevde vissa dagar som ett rent helvete med känslor som oro, ångest och stress. För barnet var det viktigt att förstå vad det var som hände med den sjuke föräldern, men även att själv bli sedd av vårdpersonalen. För att kunna hantera situationen fanns ett stort behov av information, både från föräldrar och vårdpersonal. Personalens sätt att ge stöd påverkades huruvida förälder och/eller barn tog till sig sjukdom och information, samt barnets eget sätt att hantera den pågående situationen. Barnen behövde även ges möjlighet att samtala med någon utomstående vuxen som de kände förtroende och tillit för. För barnen var tiden tillsammans med föräldern viktig och betydelsefull. De var trots detta tillslut beredda att ge upp den för att få slut på förälderns lidande. Resultatet visade att förälderns sjukdom och mående påverkade hela familjen, därför bör familjen ses som en helhet och vården bör ha ett familjecentrerat fokus. Detta för att inkludera och stödja barnet under denna kaosartade tid. 

  • Karldorff, Harri
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
    Karldorff, Harri
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
    Dränerande bärlagermaterial: Produktion och egenskaper av bärlagermaterial i bergtäkterna Kjula och Eker2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    I detta examensarbete framtogs två bärlagermaterial med hög dränerande förmåga från NCCs bergtäkt i Kjula samt standardprodukt 0/32 mm som användes som referens. De sökta egenskaperna som beaktades var hög permeabilitet, hög porositet, god bärighet och kostnadseffektiv produktion. Tester gjordes på materialens porositet, permeabilitet, vattenkvot och materialens kornstorleksfördelning analyserades.

    Materialet framtogs genom att avskilja 0/16 i ingående till kross och sedan sikta fram sortering 0/32 mm. Materialet analyserades i laboratorium där korndensitet och kornstorleksfördelning bestämdes. Vattenkvoten fastställdes genom torkning i ugn och permeabiliteten mättes med rörpermeameter.

    Resultaten visade att den viktigaste parametern för ett materials permeabilitet är andelen finmaterial (<0.063 mm) och genom förändring av ingående material till kross kan permeabiliteten och porositeten förändras i utgående materialet. Mätning av materialens egenskaper visade att permeabiliteten förbättrades till k = 4.4 * 10-3 m/s jämfört med referensmaterialet k = 1.8 * 10-4 m/s. Materialets porositet n ökade från n = 32.58 %, för referensmaterialet, till n = 37.96 %.