123 1 - 50 of 119
rss atomLink to result list
Permanent link
  • Svensson Strid, Dennis
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences.
    FRÅN JÄRN TILL SAND: EN STUDIE OM KARLSVIKS TRANSFORMATION FRÅN ETT INDUSTRIELLT TILL POSTINDUSTRIELLT OMRÅDE2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this study is to examine how the area of Karlsvik has changed according to different interests. This has been done by studying how the area has changed during two different periods (from the ironwork during 1906-1925 and the campsite during 1970-1985). Questions about the use of Karlsvik’s land during the ironwork versus campsite have served as the starting point when gathering information. A combination of comparative study and discourse analysis has been used to create a picture of how the area has been used and to get an understanding of how its people reacted to decisions about changes to the area. From being focused on industrial activities to a tourism area has had effects on the area. For example, the transformations are most evident during the construction of the camping place where large investments were made so the area would be more appealing and attract tourists.

  • Samuelsson, Björn
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Human Work Science.
    Arbetsskador i byggverksamhet 2015: Privat och offentlig verksamhet : bygg- och anläggning, byggnadsplåtslageri, elinstallation, ventilation, VVS, måleri, Glasmästeri, maskinentreprenad2017Report (Other academic)
  • Lindh, Therese
    et al.
    Luleå University of Technology, Department of Health Sciences.
    Frykvall, Jessica
    Vårdpersonalens upplevelser och utmaningar i demensvården2017Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Aim: To describe staffs experiences of challenges when nursing people with dementia and BPSD.

     

    Design: A qualitative study with interviews of focus groups. Eleven persons from two nursing homes in the north of Sweden were interviewed.

    Results: The analysis emerged into three categories that describes staffs experiences and challenges:  To aim for seeing the person behind the illness, the importance of colleagues, it is difficult to be sufficient. Staff wanted to meet the person behind the dementia but meet difficulties in their work. The staff had a demanding job and faced challenges as an effect of not giving the right care that the staff wanted to give. The consequence of this was stress and bad conscience. The result marked the importance of having colleagues to communicate with, who wants to work in a team and after the same goals.

     

    Conclusion: The challenges in nursing care of people with dementia and BPSD are many. Superiors can learn from these difficulties to provide staff what they need to give person centered care to people with dementia and BPSD. That can lead to more job satisfaction among healthcare staff  so they can keep on taking care of the people who needs them.

  • Eklundh, Henrik
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
    Ferm, Simon
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
    Krökningsmätning av produktionsborrhål i MUJ2014Independent thesis Basic level (degree of Bachelor), 180 HE creditsStudent thesis
    Abstract [en]

    While drilling holes it is extremely important that the drill holes are drilled as straight as possible. Even with the advances in drilling technology over the years it is still almost impossible. This is especially the case as the drilling depth increases. Drill hole deviation is affected by a variety of factors including drilling techniques such as weight on bit (WOB) or drill string diameter and rock properties such as density and crystal structure. It is important to study the deviation of the drill holes to ensure that the borehole is aligned correctly. When there is deviation within a boreholes major negative consequences can occur. This thesis describes the results from deviation measurements of drill holes from two different drifts within the ore body ”Alliansen” in the LKAB mine in Malmberget (MUJ). In the first drift, the production holes were drilled with a 115 mm drill bit, and in the second a drill bit of 105 mm. This is based on a project “Klenare borrhål” initiated by LKAB Wassara, a subsidiary of LKAB. LKAB Wassara wished to evaluate a possible reduction of drill hole diameter from the current 115 mm, to 105 mm. If the project had positive outcome, further attempts with an even smaller borehole diameter of 89 mm would be tested. There will also be curvature measurements as part of the evaluation of Wassaras new drill hammer, W90. The results of the measurements show that the average deviation of drill holes drilled with a larger diameter drill bit had much higher deviation than for the smaller diameter drill holes drilled with a smaller drill bit.

  • Gustafsson, Camilla
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences.
    Nature during the Crusades: Physical and psychological affects from the environment in crusader narratives.2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In this study, I have investigated what some of the crusaders thought of and how they were affected by the nature they encountered during the crusades. This have been done based on written sources from the crusades using the concept of Environmental imagination in medieval texts. The texts in this study have been chosen depending on their availability and their translation. The crusaders found themselves in a new nature that they were not prepared for and in which the enemy could hide in. The nature could also work as a moral boost for the crusaders confirming that God was on their side or work as a death-trap when they were led astray. It is clear that the crusaders experienced both physical and psychological effects from the nature that they encountered during the crusades. 

  • Stenström, Christer
    et al.
    Xin, Tao
    School of Civil Engineering, Beijing Jiaotong University.
    Parida, Aditya
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    A rapid method for estimating the prevented train delays as an effect of rail infrastructure inspections2016In: The Infrastructure Construction and Maintenance of High-speed Railway and Urban Rail Transit in Complex Environment / [ed] F. Chen, X.P. Cai, L.J. Wang and L. Gao, China Railway Publishing House , 2016, 51-55 p.Conference paper (Other academic)
    Abstract [en]

    In this study, a formula is described for calculating the relationship between preventive maintenance inspections and train delays for rail infrastructure. The reduction in train delays due to preventive maintenance has been calculated as follows: When an inspection is performed, the probability to find a potential failure is between 0 and 100 %. The potential failure is registered as an inspection remark. The risk that the potential failure will degrade to a functional failure within a certain time is also between 0 and 100 %. Strictly speaking, this time is equal to the specified maximum time to restoration in the inspection remark registration, e.g. within one week, but in practice longer. As an example, one can assume 100 inspections, with 10 % probability to find a potential failure, 75 % risk for functional failure if an action is not taken within a near future and 25 % risk for train delays. This gives 100 · 0.1 · 0.75 · 0.25 = 1.875 prevented train-delaying functional failures, and therefore 1.875 times the average number of train delay minutes in reduced minutes of train delays.

     

    A case study was carried out to verify the proposed method. The prevented train-delay minutes per maintenance inspection for various rail infrastructure systems were found to be between 0-40 minutes per inspection. However, the result depends to a large extent on the definition of inspection within the maintenance database. The result also depends on the type of inspection, e.g. safety or maintenance inspections. Moreover, the result depends greatly on the criteria that are being used for specifying the risk that a potential failure will degrade to a functional failure within a certain time period. These factors need to be clear before actions are taken upon the results.

  • Haglund, Elin
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
    Fukthaltens påverkan på maskintillverkad betongsand vid Vikan Kross2016Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis examines how the moisture content of the input material as well as the speed setting on the VSI-crusher affect grain shape and filler content in manufactured concrete sand. The aim of this thesis is to determine the most effective speed setting on the VSI-crusher and additionally to examine the capacity of the windsift at different moisture levels. Some suitable instruments for measuring humidity and determining grain shapes have also been studied.

    Sampling was conducted in the concrete sand plant at Vikan Kross owned and operated by Skanska Asfalt and Betong AB. Tests to produce grain size distribution curve, fleakiness index and moisture content were performed at Skanska´s laboratory in Angered.

    The impact of moisture is more evident at a lower speed setting on the VSI-crusher, the filler content is more than doubled when the material goes from dry to humid.

    The grain shape is improved at a higher speed setting on the VSI-crusher, also the filler content in the manufactured concrete sand is lower. Best grain shape is achieved in dry material.

    The amount of filler that the crusher generates is also lower at the higher speed setting, except for very wet material. The windsifts ability to reduce filler content in the material varies greatly between moisture levels.

    The study of instruments resulted in three instruments considered suitable for concrete sand manufacturing, one portable and one permanently installed from Franz Ludwig GmbH for moisture measurement and one instrument from Retsch Technology for determination of grain shape.

  • Delsing, Jerker
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Borg, Johan
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Johansson, Jonny
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    New architecture for efficient data sampling in Wireless Sensor Network Devices2013Article in journal (Other academic)
    Abstract [en]

    When discussing powering wireless sensor net- work nodes, there are a few major energy consumers: com- munications, microcontroller and the sensor. We propose a wireless sensor network platform architecture minimizing the energy consumption of sensing. The architecture proposed herein is based on a reactive approach to sensing. A number of possible hardware approaches are evaluated and compared. This comparison indicates that analog storage between the sensing element and the sensor electronics can be a feasible method for reducing the energy consumption of the system.

  • Gorur, Yunus
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
    Surface Treatment of Softwood Lignin Based Carbon Fibers for Enhanced Interfacial Adhesion: Effects of Plasma Treatment Parameters on the Creation of Surface Groups2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Lightweight design is an essential part of lowering CO2 emission, which is one of the mostimportant challenges that the automotive industry is facing today. Carbon fiber reinforcedplastics offer an enormous potential for replacing heavier structural materials like steel andaluminum, however due to their high cost and scarcity, carbon fibers are not a very feasibleoption to use in high volume production applications. It is thought that the introduction of arenewable, low-cost raw material, like lignin, as the carbon fiber precursor would not onlylower the cost but also increase supply compared to its PAN based counterparts. Properties ofthe fiber/matrix interface play a crucial role in governing the overall performance of thecomposite material. Good adhesion between the fiber and the matrix must be ensured in orderto maximize performance. In this study, plasma treatment of softwood lignin based carbonfibers was performed in order to increase the interfacial adhesion between the fiber and thematrix by incorporating functional groups onto the fiber surface. Plasma treatment time,plasma power, chamber pressure and plasma gas type were varied in order to investigate theireffects on the functionalization of the surface by various visual, chemical and mechanicalcharacterization methods. Observations with optical and scanning electron microscopiesshowed the cleaning effects of plasma treatment on the fiber surface by removal of flakes andsmoothing of the fiber surface. The smoothing effect of plasma treatment was later supportedby the subtle increase in the tensile strength of the plasma treated fibers and this wasattributed to the elimination of crack initiators on the surface by a so-called “polishing” effect.Contact angle measurements of the lignin based fibers showed that all plasma gases achieve acertain level of decrease in the contact angle values thus lowering the surface tension. X-rayphotoelectron spectroscopy (XPS) results were analyzed using a design of experimentssoftware with a PLS fit. For the highest amount of surface functionality to be achieved, it wasconcluded that oxygen plasma should be used with high plasma power, low pressure and ahigh treatment time. Detection of Na and S elements combined with unusually lowmechanical properties for all lignin based carbon fibers indicated insufficient carbonization ormolecular orientation for the softwood lignin based carbon fibers used in this study.

  • Svärd, Erik
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
    Elektromagnetiska fälts påverkan hos personer i dess närhet2017Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
  • Sissakian, Varoujan
    et al.
    Erbil, Iraq.
    Ahad, Ayda Abdul
    Iraq Geological Survey, Baghdad.
    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.
    Geology of Wadi Hauran, the Largest Valley in Iraqi Western Desert2017In: Journal of Earth Sciences and Geotechnical Engineering, ISSN 1792-9040, E-ISSN 1792-9660, Vol. 7, no 2, 103-132 p.Article in journal (Refereed)
    Abstract [en]

    Wadi (valley) Hauran is the largest valley not only in the Iraqi Western Desert but the whole Iraqi Territory. The length of the valley inside Iraq is about 420 Km, whereas the drainage basin area inside Iraq is 16550 Km2. The valley exhibits different forms along its course; like shallow and wide, deep and wide, and canyon. The valley starts from the Iraqi – Saudi Arabian international borders and even inside Saudi Arabia and runs generally northeast wards; with slight changes in its main course trend, exhibiting many right angle meanders. The oldest exposed rocks along the course and banks of wadi Hauran belong to the Upper Triassic Zor Hauran Formation, whereas the youngest exposed rocks belong to the Middle Miocene Nfayil Formation. Different Quaternary sediments occur in the valleys course and banks. The main structural elements along the course of wadi Hauran are a set of NW – SE trending faults, beside extensive jointing of the rocks, especially in the left bank northwest of Rutbah town. Different geomorphological units and forms are developed along the course of the valley and on its banks. From economical point of view, enormous amounts of sand and gravel are developed as valley fill sediments. Limestone for cement industry and many other metallurgical industries with huge geological reserves is available in different formations, like Ratga and Euphrates. Pure silica for glass and crystal industry is available in Rutbah Formation. Bauxite and sedimentary iron are available in Hussainiyat Formation. Clays for different industrial uses are available in different formations; like Ubaid, Hussainiyat, Muhaiwir, Hartha, Tayarat and Akashat formations. The different forms of wadi Hauran along its course with different exposed rocks and developed different slopes along its banks have developed different mass wasting phenomena in different parts. Among the most common forms are: Toppling, rock fall, slumping, creep and very rare sliding.

  • Anderson, Anne Lee
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
    Funktionsnedsattas utrymningsmöjligheter på arbetsplatser: En jämförelse av svenska, danska och amerikanska lagstiftningar samt granskning av ett svenskt företags utrymningsvägar och potentiella förbättringsförslag2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Alla människor bör ha lika rättigheter och samma möjlighet att medverka och bidra till samhället efter sin egen förmåga. För att uppnå detta bör en större satsning ske på att undanröja funktionshinder vilka hindrar personer med funktionsnedsättningar att delta och utöva vardagliga sysslor, så som att arbeta. Genom att förbättra omgivningen för personer med funktionsnedsättningar förbättras inte bara deras möjlighet att delta i olika aktiviteter i samhället utan även deras säkerhet vid en potentiell olycka som medför utrymning (Utvägen).

    På uppdrag från Caverion har granskning av frångängligheten på AstraZeneca, Mölndal, genomförts som en del i detta arbete och potentiella åtgärdsförslag presenterats. Önskan från AstraZeneca att lyfta frågan kring frångänglighet baseras på strävan att öppna upp anläggningen för personer med funktionsnedsättningar. Detta för att minska diskriminering för personer som inte kan utlovas samma utrymningssäkerhet och så att de kan anställa personer baserat på kompetens oavsett fysisk förmåga. I samband med detta uppdrag har granskning av dagens krav på frångänglighet studerats enligt svenska så väl som internationella lagar. Detta för att få en bild över situationen i dag i Sverige samt för att framföra potentiella förbättringsförslag för ökad frångänglighet på AstraZeneca i Mölndal baserat på internationella lagar och riktlinjer.

    Målet med detta arbete har varit att belysa potentiella problem vid evakuering av personer med funktionsnedsättningar från AstraZeneca i Mölndal. Även möjligheten till att skapa en ökad utrymningssäkerhet har studerats, och förslag på organisatoriska och tekniska förbättringar har tagits fram.

    De metoder som tillämpats är litteraturstudier, praktisk genomgång och kontroll av befintliga utrymningsvägar på AstraZeneca i Mölndal samt granskning av interna styrande dokument hos företaget i fråga.

    Några av de föreslagna förbättringsåtgärderna detta arbete resulterat i är att införa utrymningsplatser eller undersöka möjligheten att nyttja evakueringsmadrasser eller trappklättrare där utrymningsplatser inte är ett alternativ. Fortsättningsvis även att vid ombyggnation eller nybyggnad införa ramper vid höjdskillnader eller om möjligt skapa horisontella utrymningsvägar till säker plats från samtliga utrymmen. Utformning av ramper och trösklar har berörts samt införande av taktila utrymningsmarkeringar och personliga larmdon. Utöver detta har även organisatoriska förbättringsförslag framförts, bland annat i form av att införa utrymningsansvariga och personliga utrymningsplaner för anställda. Ytterligare förslag är även att bistå med tydlig information kring utrymningssäkerhet och utrymningsmöjligheter till gäster samt anställda och att ta fram personliga utrymningsplaner för anställda med specifika förutsättningar.

    De förslag som lämnats som förbättringsåtgärder är framtagna utifrån de specifika förutsättningar som finns för AstraZeneca i Mölndal. Om dessa föreslagna åtgärder ska appliceras på andra arbetsplatser måste var och ett anpassat till respektive byggnads planlösning och verksamhet, samt utifrån antal personer med funktionsnedsättningar som kan förväntas vistas i lokalerna och möjliga gäster på arbetsplatsen. Därmed kan de olika åtgärdsförslagen förväntas nyttjas på olika sätt och platser beroende på olika förutsättningar på olika arbetsplatser.

  • Jonsson, Adam
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mathematical Science.
    Voorneveld, Mark
    Department of Economics, Stockholm School of Economics.
    The limit of discounted utilitarianism2017In: Theoretical Economics, ISSN 1933-6837, E-ISSN 1555-7561Article in journal (Refereed)
    Abstract [en]

    This paper presents an infinite-horizon version of intergenerational utilitarianism. By studying discounted utilitarianism as the discount factor tends to one, we obtain a new welfare criterion: limit-discounted utilitarianism (LDU). We show that LDU meets the standard assumptions of efficiency, equity, and interpersonal comparability, but allows us to compare more pairs of utility streams than commonly-used utilitarian criteria, including the overtaking criterion and the catching-up criterion. We also introduce a principle of compensation for postponements of utility streams and use it to characterize the LDU criterion on a restricted domain.

  • Isaksson, Raine
    et al.
    Uppsala universitet.
    Yamamoto, Yuji
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Business Administration and Industrial Engineering.
    Garvare, Rickard
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Business Administration and Industrial Engineering.
    Towards a perfect learning process: where is Sweden?2016In: Sinergie italian journal of management, ISSN 0393-5108, Vol. 34, no 100, 57-75 p.Article in journal (Refereed)
    Abstract [en]

    Purpose of the paper: Competition gets tougher with globalization. Information and knowledge are shared like never before, putting pressure on businesses and nations to provide effective and efficient means of learning. Learning could be seen as the educational process from the user perspective. How could a perfect learning process look when based on process theory and how does reality compare with this? One option is defining a perfect process as doing the right thing based on stakeholder needs, doing it in the right way by minimising resource use and by being adaptable.

    Methodology: Applying the proposed educational process on Swedish HEI educational processes indicates that the model can be used.

    Findings: The results from the study indicate that Sweden seems to perform well in many areas but also that there are important areas of improvement, such as lifelong learning and the integration of sustainability into education.

    Research limitations: The proposed process has only been partly tested.

    Research and managerial implications: The strength of the process approach.

    Originality/value of paper: Basic process theory in a new context.

  • Ali, Jones
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Alisson, Hussein
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Gestaltningsprogram Murjek: Ett förslag på anpassning av småskaliga tågstationer avseende turism, funktion och tillgänglighet2017Independent thesis Advanced level (degree of Master (Two Years)), 40 credits / 60 HE creditsStudent thesis
    Abstract [en]

    Trafikverket plans to soon upgrade theplatform of Murjek station, a small-scale trainstation that constitute Jokkmokkmunicipality's only railway station alongMalmbanan and has clear links to touristdestinations. In connection with this, amapping of touristic aspects for smaller trainstations related to tourism shall be made andan associated design program for Murjekstation area will be developed.This method in this report consists of doing asystematic literature review, interviews andfield studies, which served as the base for themapping that has been done. The goal of thisreport is to, through the touristic aspects andthe design program, answer the followingscientific questions:How can a design proposal for a small-scaletrain station linked to tourism look like?● What features are important to create anaccessible and functional train station?● What parameters are important for a smallscaletrain station seen from a touristicperspective?How should Murjek station and thesurrounding station area be designed in orderto promote tourism development in asustainable way?● How can touristic experience values be metthrough the design of the station area?● What touristic aspects should be met in thedesign of Murjek station?Through following the method ofåtgärdsvalsstudier, the station area has beeninventoried and a summarized view of theshortcomings in the area has been compiled.Furthermore, measures of action based on theinterviews and theory have been developedand evaluated which has culminated in thetouristic aspects. These, along with the theoryfor the design of train stations, were the basisfor the design program.The compiled touristic aspects cover the areasof design, information, culture, art,functionality, and social aspects and aredesigned to be applicable to all small-scalestations linked to tourism. The design programis divided into three parts: the station area,the station building and the platform. All threeareas have been renovated and adapted to bemore accessible and functional based onexisting guidelines and to meet the touristicaspects developed.The design program embodies the practicalapplication of the touristic aspects and theexisting guidelines for functionality,accessibility, and design. This result is meantas a source of inspiration for other small-scalestations and demonstrates the possibility tocombine all of these elements into anattractive travel center that is well suited forall types of travelers, including persons withdisabilities and tourists.The report is geographically limited to Murjekand its vicinity and is limited to theparameters tourism, accessibility, andfunctional adaptation.

  • Enckell, Christopher
    et al.
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences.
    Isgran, Moa
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences.
    Barriers towards a successful adoption of PSS: A Provider and Customer Perspective2017Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    With the arising digital disruption and global market pressures, several manufacturing companies have recognized the strategic integration of services as a way to competitive advantage and corporate profitability, they therefore have the desire to differentiate themselves by creating new service-oriented strategies, namely Product-Service Systems (PSS). While transforming towards a PSS provider there are a number of barriers that the organization has to overcome. After an extensive literature review the authors identified 34 such barriers. Tukker (2015) argues that the number of successful adoptions of PSS among manufacturing firms is surprisingly low, despite an increased literature awareness and focus on the barriers. The identified barriers are most often seen through the manufacturers’ perspective and little is mentioned about the customers’ perspective on barriers. The gap that was identified in the literature was the lack of customers’ perspective upon these barriers. This thesis aims to investigate the perceived barriers from both the customers’- and the provider’s perspective, and to examine which barriers the provider should emphasize to have the highest potential to successfully transform into a PSS provider.

    We used Bosch Rexroth as a focal firm and conducted in total 29 interviews with them and their customers and a workshop with 11 participants from the provider. The data from the provider and the customers were separately analysed until the last step, where it generated a barrier spheres. The spheres were used as a foundation for the emerging framework. The framework’s step wise approach is a guideline for manufacturing firms in their efforts to overcome the barriers in order to successfully adopt PSS. This thesis is a first contribution towards shredding light upon the customers’ perspective of barriers towards PSS. Our research shows that one perspective of these barriers is insufficient, since PSS involves both the provider and the customers it should thereby include both perspectives. The managerial implications of this thesis is partly the framework but also the importance for a provider to work closely to their customers and build strong relationships in order to overcome to barriers towards PSS together.

  • Larsson, Louise
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
    SKA-processen: Konkreta riktlinjer och mätbarhet som stöd i sociala konsekvensanalyser2017Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
  • Sako, Abdallakh
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering.
    Design av planeringssystem för studenter2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • Björklund, Andreas
    et al.
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences.
    Agermo, Erik
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences.
    Digital freedom in physical form:: Developing a flexible model for representation of product series2017Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This master thesis from Industrial Design Engineering, Product Design, at Luleå University ofTechnology, has been formulated and assigned by Polardörren AB. Today’s manufacturing companiesoften display their products by using sample products in physical stores. Polardörren AB is a doormanufacturing company located in northern Sweden and have a wish to be experienced as a creativeand flexible company. Competitors to Polardörren AB have started using digital software to let theircustomers experiment with the composition of their products. This provides huge possibilities inrepresentation, however, digital is not always better. Digital representations mean a complete lackof feeling for material or quality. Ideally you would be able to combine the freedom of the digitalworld with the feeling of the physical world, and this is where our model fits in perfectly. We havedeveloped a prototype that, with the use of modularity, can represent many of Polardörren AB’sproducts in an effective and compressed way. By using the same type of material as the companyuse in their regular products, we present the user with a similar feeling as from the real products.Neodymium magnets lets a consumer, in an easy way, create and explore custom-made designsbased on their personal needs and wishes. By involving the end-user in the design process, webelieve that the number of purchases of the company’s products, and the general opinion towardsthe company, will increase. This could lead to increased revenue for both resellers and manufacturer.During the development process of this prototype, areas such as industrial design, semiotics, userexperience and usability has been explored. Methods used in this project ranges from brainstormingand brainwriting to computer modelling and CNC-milling. If this prototype would replace one ofthe existing product samples at the reseller today, the cost for representation would be estimated togo down to one third of the cost today. By using material that the company already have in theirproduction today, we make a minimal impact on the environment by preventing excess deliveriesfrom new distributers.

  • Forsberg, Fredrik
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
    Increased Traffic Loads on Swedish Highway Bridges: A Case study of the bridge at highway interchange Värö2017Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The Swedish government is planning to increase the maximum vehicle gross load regulations on parts of the national roads from the present 60 t, for the load carrying capacity class BK1, to 74 t, for the proposed new load carrying capacity class BK4. The initial implementation of the new load carrying capacity class for 74 t vehicles will only regard major highways and important roads, however, at a later stage the plan is to implement the new BK4 class on the full current BK1 road network. The biggest obstacle which arises when implementing these increased traffic loads is insufficient load carrying capacity for the bridges on the road network.

     

    Thus, the objective of this thesis is to examine and analyze the effects of the increased traffic loads on Swedish road bridges. In order to identify the structural effects of the load increase, and draw general conclusions regarding the effects on the bridge network as a whole, a case study with load carrying capacity calculations is carried out on a two-span concrete slab fram bridge at a highway interchange in Värö in western Sweden. The bridge is classified as critical by Trafikverket. The load carrying capacity calculation is carried out using the Swedish standards, in which maximum load values for the axle load, A, and the bogie load, B, is calculated.

     

    The load effects acting on the bridge are calculated using the finite element software BRIGADE/Standard, with input traffic A and B loads amounting to 12 t and 21 t respectively for the new BK4 class and to 12 t and 18 t respectively for class BK1. In addition to the load carrying capacity calculations with BK4 traffic loads, a comparison is carried out between the results obtained when using the axle- and bogie loads from the BK1 versus the BK4 load carrying capacity class in the load carrying capacity calculations.

     

    The load carrying capacity calculations performed on the studied bridge shows that the capacity of the bridge, both in regards to moment and shear force, is insufficient to meet the new, increased, BK4 A/B – requirements. The critical A/B – values for the whole bridge are 17 t and 18 t respectively, to be compared with the required 12- and 21 t limit for the new BK4 load carrying capacity class, thus, making the load carrying capacity of the bridge inadequate. The critical A/B – values appear for the longitudinal shear force load case at the point where the shear force reinforcement over the column support ends. Moreover, the difference between the results obtained when using the BK1 versus the BK4 traffic loads in the calculations were found to be negligible.

     

    Due to the differing properties and characteristics of each individual bridge on the Swedish road network it is difficult to make general statements regarding the effects of the increased traffic loads on the bridge network as a whole. Specific load carrying capacity calculations will need to be performed on each individual bridge in order to evaluate its capability to withstand the new increased BK4 traffic load. However, capacity calculations regarding the BK1 load carrying capacity class can, with sufficient accuracy, be used to evaluate the capability of a bridge to withstand the increased traffic loads in the BK4 load carrying capacity class, thus, making it easier to evaluate the strengthening needs for the bridge network as a whole.

  • Tjus, Erik
    et al.
    Luleå University of Technology, Department of Arts, Communication and Education.
    Mörk, Alexander
    Luleå University of Technology, Department of Arts, Communication and Education.
    Den osynliga muren: En intervjustudie av gränsdragningen mellan redaktion och annonsavdelning i svensk lokalpress2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The relationship between editorial and advertising departments in the written press has always been under discussion. There have been incidents, in the past, where advertisers have tried to exert influence over editorial material. In the pursuit of avoiding this, the journalistic professional identity relies heavily on independency. There is something that distinguishes the difference between the department of advertising and the editorial office, a kind of "invisible wall", one might call it. The editorial part of a newspaper work with journalism, while the advertising department is working with finances, and, according to journalistic principles, the two should never meet.

    In this study we have investigated the relationship between the advertising department and the editorial office of local newspapers in Sweden. We have done this by making use of qualitative interviews with respondents from these workplaces, and then analyzed their responses with a vertical and horizontal analysis method.

    We could in our essay, to some extent, conclude that the "invisible wall" may well have changed in recent years. It was previously set in stone, in the form that the contact between the department of advertising and the editorial office was almost non-existent. Today it rather seems to be a question of smaller forms of cooperation. We came to the conclusion that the journalistic profession and the self-image seems to be somewhat unchanged, or at least similar, to what previous research have concluded. But the actual dialogue between the different departments have come to change a bit.

  • Chabuk, Ali
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Al-Ansari, Nadhir
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Hussain, Hussain M.
    Department of Geology, College of Science, Kufa University.
    Knutsson, Sven
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Pusch, Roland
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Landfill Sites Selection Using AnalyticalHierarchy Process and Ratio ScaleWeighting: Case Study of Al-Mahawil,Babylon, Iraq2017In: Engineering, ISSN 1947-3931, E-ISSN 1947-394X, Vol. 9, no 2, 123-141 p.Article in journal (Refereed)
    Abstract [en]

    Selecting a landfill site is an optimal solution for the disposal of solid waste inAl-Mahawil Qadhaa, both to fulfill the environmental and scientific requirements,and to comply with regulations and restrictions in this Qadhaa. Presently,there is no landfill site in the area that meets the scientific site selection criteria.Therefore, in this study, two methods of multi-criteria decision-makingand Geographic Information System (GIS) were used to produce a map ofcandidate sites for landfill. Fifteen criteria were entered within GIS: groundwaterdepth, rivers, soil types; agriculture lands use, land use, elevation, slope,gas pipelines, oil pipelines, power lines, roads, railways, urban centers, villagesand archaeological sites. The Analytical Hierarchy Process (AHP) is the firstmethod that was applied to derive criteria weightings using the matrix of pairwisecomparisons. The second method was the Ratio Scale Weighting (RSW),which is based on experts’ opinion, in order to identify the criteria weightingsby giving a ratio score value for each criterion relative to the other criteria.Accuracy assessment (Kappa and Overall Assessment) methods were used tocompare the two raster maps which resulted from the two models, and to determinethe percentage value of matching pixels for the two maps. Two suitablecandidate sites for landfill were identified that satisfy the requirementswith an area of 2.218 km2 - 2.950 km2 in order to accommodate the solidwaste generated from the Qadhaa in the period 2020 to 2030.

  • Hedayati, Ali
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
    Asghari, Saeed
    Institute of Materials and Energy, Iranian Space Research Cente.
    Alinoori, Amir Hosein
    Institute of Materials and Energy, Iranian Space Research Cente.
    Koosha, Morteza
    Institute of Materials and Energy, Iranian Space Research Cente.
    Vuorinen, Esa
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
    Effects of coating thickness on corrosion and contact resistance behavior of TiN coated AISI 316L as bipolar plates for PEMFC2016In: Iranian Journal of Hydrogen & Fuel Cell, ISSN 2383-1618, Vol. 3, no 2, 137-149 p.Article in journal (Refereed)
    Abstract [en]

    In the polymer electrolyte membrane fuel cells (PEMFCs), low corrosion resistance and high interfacial contact resistance (ICR) are two controversial issues in usage of AISI 316L stainless steel as a metallic bipolar plate. For solving these problems, investigation and development of different coatings and/or surface treatments are inevitable. Corrosion behavior and ICR of AISI 316L specimens coated with 1, 2, and 3 µm thick TiN were investigated. Potentiodynamic (PD), potentiostatic (PS) and electrochemical impedance spectroscopy (EIS) tests were conducted at 80 °C in pH3 H2SO4+2 ppm HF solution purged with either O2 or H2 under both simulated cathodic and anodic conditions. The PS corrosion test results revealed that the current densities of the specimens were below 1 µA cm−2. In the simulated cathodic condition, an increase of coating thickness from 1 to 3 µm led to a relatively large decrease of the current density from 0.76 to 0.43 µA cm−2. Furthermore, the ICR values of the coated specimens after the PS test were lower than that of the uncoated specimen before the PS. In general, the TiN coating decreases the ICR, and has enough corrosion resistance in simulated PEMFC conditions. However, none of the coatings achieved the DOE ICR targets.

  • Parida, Aditya
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Stenström, Christer
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Asset performance evaluation: A recipe for success or failure2016In: Proceedings for the COMADEM 2016, 2016Conference paper (Refereed)
    Abstract [en]

    Abstract.The prevailing economicdownturn, looming global recession, vola-tile energy and asset prices with emerging technology for prescriptive analytics and increasing budgetary cuts have compelled the companies to manage its en-gineering assets competitively for survival and growth. As per international standard ISO 55001:2014, performance evaluation is fundamental to asset man-agement system (AMS). Asset maintenance performance measurement and management (AMPM) is a recognized process and best practice for supporting sustainability and return on investment.It is hard for an organization to improve the present level of performance of the engineering assets without measurement. Therefore, all functions including units and processes of the organization need to be built and developed as per as-set management principles, such as; ISO 55000 series standard. The challenges in AMPM are to prepare a strategic road map from top management level to the operational level through a link and effect model for identifying and developing key performance indicators (KPI). These KPIs are broken down to measures which are used for monitoring and controlling the unplanned downtime with in-creased reliability, availability, maintainability and safety. Other challenges are to define and develop methods for right data collection through condition moni-toring and big data analytics, beside management for knowledge management. eMaintenance is required for remote data collection, storage, analysis and deci-sion making. The KPIs and indicators will be used for developingcomposite indicators (CI) for bench marking the performance with the best in the industry, besides verifying the return on investment.The author has discussed the various compulsions and challenges associated with asset performance evaluation (APE) for AMPM for the organization. Once the AMPM fundamentals and recipe is known, its success or failure will depend on finding solutions for the challenges while defining, structuring, developing, and implementing AMPM system.

  • Al-Zubaidi, Ibrahim
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
    Numerisk simulering av sättningar och portryck för en provbank på sulfidjord2017Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Den finkorniga sulfidjorden som finns längs Norrlandskusten är känd för sin stora sättningsbenägenhet och utgör en potentiell miljörisk genom försurning och urlakning av metaller om den inte hanteras rätt. För att förebygga miljörisker och utveckla jordförstärknings- och grundläggningsmetoder måste en ökad kunskap om sulfidjordar tas fram. I ett pågående forskningsprojekt vid Statens Geotekniska Institut studeras sulfidjords kompressionsegenskaper och rekommendationer ska tas fram avseende underlag för sättningsberäkningar. I projektet omfattas ett antal provbankar där ett av dessa områden, Lampen ligger i Kalix i norra Sverige. I detta examensarbete har det utförts numeriska analyser i finita elementprogrammet PLAXIS 2D av sättningar och portryck under en av provbankarna i Lampen och jämförelser görs med tidigare rapporterade fältmätningar.

    Tre olika delar analyseras i FE-programmet PLAXIS 2D. I den första delen, som är huvuddelen, utvärderas materialmodellernas, Soft Soil (SS) respektive Soft Soil Creep (SSC), förmåga att simulera de uppmätta sättningarna och porövertrycken för en period av cirka ett års belastning av provbank. Den andra delen består av en analys av de två deformationstillstånden, axialsymmetriskt och plant. De två deformationstillståden jämförs med hänsyn till sättningar och portryck. I den tredje delen utvärderas påverkan på simulerade resultat av olika nivåer på grundvattenytan, en variation som har observerats i provområdet i Lampen.

    Vid en jämförelse av de konstitutiva modellerna noteras som förväntat större sättningar vid användning av SSC-modellen i jämförelse med SS-modellen. SSC-modellen visar även ett högre porövertryck. Vid jämförelse med i fält uppmätta värden noteras att de mest överensstämmande sättningarna erhålls från SS-modellen medan portrycksutvecklingen simuleras bättre, men ändå långt från bra, med SSC-modellen (för simulering med dubbelsidig dränering).

    Vid analys av deformationstillstånd (axialsymmetriskt kontra plant) noteras en jämnare fördelning av deformationer längs banken vid användandet av axialsymmetriskt tillstånd. Den potentiella brottrörelsen som uppvisas vid släntkrön vid tillämpning av plant deformationstillstånd är inte lika tydlig vid axialsymmetriskt tillstånd. Det axialsymmetriska tillståndet visar även ett lägre porövertryck.

    Numeriska simuleringar av den varierande nivån på grundvattenytan som observerats i fältmätningar visar vid fallet en lägre antagen grundvattennivå en marginellt mindre sättning.  Potentiella brottrörelser blir inte lika tydliga då den lägre nivån på grundvattenytan simuleras.

  • Bektic, Mirsa
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
    Kalkylen under produktionsfasen: En studie om hur kalkylen används under produktionsfasen på Skanska2017Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
  • Berg, Malin
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
    Hur platschefens engagemang påverkar ekonomin i ett byggprojekt: Kan Lean driva engagemanget i en positiv riktning?2017Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Byggsektorn har generellt sett små ekonomiska marginaler att spela på. Det medför att projektets ekonomiska styrning är en viktig del i platschefens dagliga arbete. Det har tidigare genomförts studier som visar på att företagen ofta är medvetna om vad som är karakteristiskt för projekt med goda resultat. En av anledningarna till att projekten inte uppnår det önskade resultatet kan bero på att företagen lägger större vikt vid processerna jämfört med människorna som ska utföra arbetet.

    Examensarbetet är skrivet hos Peab Sverige AB, Region Bygg Nord, Luleå, och grundar sig i ett grupparbete som genomfördes bland tjänstemännen med fokus på att identifiera de faktorer som i byggprocessen påverkade det ekonomiska resultatet. Även på Peab fanns en medvetenhet för hur arbetet ska utföras för att nå goda resultat. Det har visat sig att engagemang är en faktor som finns med i alla processteg och som påverkar arbetet. Det är där som det här arbetet tar vid. Syftet med examensarbetet är att koppla ihop projektets ekonomi med gruppens engagemang samt redogöra för hur Lean kan användas som synsätt för att driva engagemanget i en positiv riktning.

    I arbetet presenteras dels de faktorer som i produktionen påverkar ekonomin, där störst fokus hamnar på tidsplanering och uppföljning av förbrukade timmar på arbetsplatsen. I arbetet presenteras också vilka faktorer som driver engagemanget. Resultatet av detta baseras på dels den genomförda litteraturstudien men framför allt på de tre intervjuerna som genomförts med platschefer på Peab. Faktorerna som i första hand belyses är vikten av medarbetarnas känsla av delaktighet och möjlighet att påverka sin egen arbetssituation. Även den personliga utvecklingen är en påverkande faktor som uppnås när medarbetare tilldelas ett ansvar eller får uppmuntran från ledaren till det egna initiativet. Slutligen belyses även vikten av att arbeta med målsättningar i projekt, vilket bidrar till ett gemensamt synsätt och en möjlighet att skapa ett starkt lag.

    Utifrån resultatet så har Lean använts som synsätt för att beskriva hur engagemanget kan drivas i en positiv riktning och vilka tankesätt som kan omsättas till Peabs sätt att arbeta. Inom Lean är filosofin och företagskulturen grunden i ett företag. Filosofin ska speglas i alla beslut och i det arbetssätt som används. Filosofin ska även bidra till medarbetarnas engagemang eftersom medarbetarna är företagets viktigaste verktyg. Engagemanget inom Lean drivs även av det standardiserade arbetssättet som är en viktig princip inom filosofin. Resultatet visade att Peabs verksamhetsledningssystem kan liknas med ett standardiserat arbetssätt eftersom i båda fallen så är syftet att arbeta enhetligt inom företaget och möjliggöra att arbeta med ständiga förbättringar. Resultatet visade dock att Peabs verksamhetsledningssystem anpassas till varje projekt vilket försvårar möjligheten att arbeta med förbättringar.

  • Flensburg, Jozephine
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences.
    ”I grunden är allt samma- jag är läkare och ska hjälpa de sjuka”: En kvalitativ undersökning om utländska läkares upplevelse av trivsel på arbetsplatsen2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    There is a shortage of doctors in Sweden and county councils need to recruit physicians from other countries to cope with future needs. The purpose of this thesis is to find out what it is like to come to Sweden to work as a doctor if the education was completed in another country and to investigate the factors that make them thrive and experience job satisfaction. I assume that job satisfaction makes them want to remain at their jobs, even if factors such as homesickness and other career opportunities can contribute to the fact that doctors still wants to move back, factors a pleasant workplace cannot compensate for. The study is qualitative and five semi-structured interviews were conducted. A thematic analysis of the results are presented and discussed on the basis of relevant theories and previous research. The results show that doctors are experiencing great uncertainty initially due in most part to a lack of language skills and the lack of support from family. Tutors, mentors and managers contribute support to a large extent and the support from them might help foreign doctors cope with negative factors such as stress and professional uncertainty. Interesting for future research would be to examine whether there is any differences between Swedish and foreign doctors experience of job satisfaction and what it depends on.

     

    Keywords: foreign doctors, wellbeing, support, tutors, coping

  • Grundtman, Per
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering.
    Adaptive Learning2017Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The purpose of this project is to develop a novel proof-of-concept system in attempt to measure affective states during learning-tasks and investigate whether machine learning models trained with this data has the potential to enhance the learning experience for an individual. By considering biometric signals from a user during a learning session, the affective states anxiety, engagement and boredom will be classified using different signal transformation methods and finally using machine-learning models from the Weka Java API. Data is collected using an Empatica E4 Wristband which gathers skin- and heart related biometric data which is streamed to an Android application via Bluetooth for processing. Several machine-learning algorithms and features were evaluated for best performance.

  • Lindmark Burck, Henrik
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
    Skatepark i Gällivare2017Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [sv]

     

     

                           

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

    Skatepark i Gällivare

     

    Henrik Lindmark Burck

     

    Sammanfattning

     

    I mitt examensarbete har jag arbetat med att ta fram en design samt förfrågningsunderlag för en Skatepark i Gällivare. Arbetet presenterades för politikerna i Gällivare kommun.

     

    Arbetet inleddes under min praktik på LKAB Samhällsomvandling där jag hade erfarna projektledare som handledare. Därefter fortlöpte projektet på egen hand efter att praktiken avslutats.

     

    Grunden till att jag valde just detta område är att det finns ett beslut att uppföra en anläggning i Gällivare men projektet har lagts på is. Det tillsammans med ett eget brinnande intresse för skateboardåkning och en önskan att göra något positivt för kommunens invånare gjorde valet av exjobb till en självklarhet.

     

    I förfrågningsunderlaget skickades ut till företag som arbetar med helhetslösningar för skateparker i Sverige och norden, behövdes först förslag på en placering och olika områdesförslag för Skateparken ifråga tas fram.

     

    För att få en någorlunda uppskattning på vad ett sådant här projekt kan tänkas kosta, var en av utmaningarna att ta fram en egen design på en anläggning baserad på de områdesförslag som tagits fram.

     

    Designen kom till liv med hjälp av medlemmar från den lokala skateboardföreningen efter att möten ägt rum där det diskuterades olika element som man önskade ingå i designen av den nya parken. 

     

    När arbetet med förfrågningsunderlaget var färdigt och efter att respons från företaget som jag skickat ut det till kommit in, förbereddes en presentation som sedan hölls för Gällivare kommuns Samhällsbyggnadsutskott.

     

    Efter presentationen var genomförd deltog jag samt medlemmar från Gällivare Skateboardförening i en Workshop för ett område som heter Sjöparken i centrala Gällivare. Sjöparken ingår i ett projekt där hela parken ska utvecklas och rustas upp.

     

    Projektledaren för upprustningen av Sjöparken tog sedan kontakt med mig för att boka in ett möte. Under mötet meddelades att en skatepark ingår i deras planering för framtida Sjöparken. Bästa möjliga utfall är nu att upphandlingen av skateparken kommer ske efter årsslutet och att arbetet med parken inleds till våren

  • Nihlén, Carl
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Limträhallbyggnader: Konstruktionsoptimering2017Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
  • Sidén, Marja
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    KL-träbjälklag i kombination med stålstommar: Teknisk utvärdering och utveckling av lösningar för förband och längre spännvidder2017Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    A currently common building technology in Sweden is the use of a steel structure in combination withprefabricated HD/F concrete slabs. This work is based on the issue of whether CLT slabs could be asuitable alternative to concrete slabs in such a structure, in combination with the type of weldedplated beams that are often called hat beams.

    As a first step a type-structure was sketched to have a well-defined starting point for an analyze. Thebasis for this structure was mainly a study of two designs constructed with steel structures composedof hat beams and HD/F slabs. The literature study was focused on underlying theories in relation to theslabs function in the structure. A number of areas were defined as a basis for an evaluation of thebuilding type. These areas where spans, design in the ultimate limit state, design in the serviceabilitylimit state, joints, design for accidental actions, acoustics and constructability. Based on the above,technical conditions for the use of CLT slabs in the building type in question were evaluated. It wasfound that in many areas there were working solutions, and that there are many positive aspectsrelated to the use of a light and easily mounted CLT slab. The issues that were found can be concluded as:

    1. Limited span lengths

    2. An increase of horizontal deformations in the slab

    3. Calculations of vibrations with respect to the flexible support

    4. Joints between slabs and hat beams

    5. Acoustic design

    Two of these issues were chosen for further analysis: joints between slabs and beams and the limitedspan length. A solution was developed for the joint, composed of a heel on the flange of the steelbeam in combination with a slit in the CLT slab. The joint is supposedly easy to mount during assembly.To be able to handle the forces along the length of the beam the solution must however becomplemented with a secondary screw joint through the flange of the beam. The hope is that a simplersolution to handle these relatively small forces can be developed, as complement to the primary jointmade up of the heel and slit. Calculations were performed by hand for the developed joint and it wasfound that it is possible to design such a joint, with reasonable dimensions, for all the acting loads.

    As the last part solutions to achieve longer spans were studied, for a flat CLT slab the span length islimited to somewhat less than 7,7m. Different types of composite slabs were studied and it was notedthat a composite with a prefabricated concrete slab and a glued connection could be a suitablesolution. Glued connections were then studied more closely, and I was found that a glued connectionbetween wood and prefabricated concrete entails great strength and rigidity. About 100% unitedaction has been observed for this type of connection. An uncertain factor is however long-term effectswhere further studies need to be found or performed to achieve more knowledge. Hand calculationswere performed using the theory in SS-EN 1995-1-1 on two types of composite slabs for a couple ofdifferent dimensions. In the calculations 100% united action was used. It was found that 9m span couldbe achieved with the combined action of CLT and concrete, while 12m could be achieved using woodenstuds for spacing. Other theories for the calculations where the natural frequency isn’t the limiting factor could lead to better results for this kind of composite slabs.

  • Ahlberg, Anton
    Luleå University of Technology, Department of Arts, Communication and Education, Media, audio technology and experience production and theater.
    Perceived audio quality of compressed audio in game dialogue2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    A game could have thousands of sound assets, to fit all of those files to a manageable storage space it is often necessary to reduce the size of the files to a more manageable size so they have to be compressed. One type of sound that often takes up a lot of disc space (because there is so much of it) is dialogue. In the popular game engine Unreal Engine 4 (UE4) the the audio is compressed to Ogg Vorbis and has as default the bit rate is set to 104 kbit/s. The goal of this paper is to see if untrained listeners find dialogue compressed in Ogg Vorbis 104 kbit/s good enough for dialogue or if they prefer higher bit rates. A game was made in UE4 that would act as a listening test. Dialogue audio was recorded with a male and a female voice-actor and was compressed in UE4 in six different bit rates. 24 untrained subjects was asked to play the game and identify the two out of six robots with the dialogue audio they thought sound the best. The results show that the subjects prefer the higher bit rates that was tested. The results was analyzed with a chi-squared test which showed that the null-hypothesis can be rejected. Only 21% of the answers were towards UE4s default bit rate of 104 kbit/s or lower. The result suggest that the subjects prefer dialogue in higher bit rates and UE4 should raise the default bit rate.

  • Flores Garcia, Erick
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Space Technology.
    Simulation of attitude and orbital disturbances acting on ASPECT satellite in the vicinity of the binary asteroid Didymos2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Asteroid missions are gaining interest from the scientific community and many new missions are planned. The Didymos binary asteroid is a Near-Earth Object and the target of the Asteroid Impact and Deflection Assessment (AIDA). This joint mission, developed by NASA and ESA, brings the possibility to build one of the first CubeSats for deep space missions: the ASPECT satellite. Navigation systems of a deep space satellite di er greatly from the common planetary missions. Orbital environment close to an asteroid requires a case-by-case analysis. In order to develop the Attitude Determination Control System (ADCS) for the mission, one needs detailed information about orbital disturbances in the vicinity of the asteroid.

    This work focuses on the development of a simulator that characterises the orbital disturbances a ecting the ASPECT satellite in the space environment near the Didymos asteroid. In this work, a model of orbital conditions and disturbances near the Didymos system was defined. The model integrates several classical and modern models of spacecraft motion and disturbance. An existing Low Earth Orbit (LEO) simulator was modified and updated accordingly to the ASPECT mission scenario. The developed simulator can be used to analyse the disturbances to be counteracted by the ADCS of the ASPECT satellite. The objective of the study was to quantify the e ect of both non-gravitational and gravitational disturbances. The simulator was used to analyse di erent orbit scenarios related to the period of the mission and to the relative distance between the spacecraft and the asteroid system. In every scenario, the solar radiation pressure was found to be the strongest of the disturbance forces. With the developed simulator, suitable spacecraft configurations and control systems can be chosen to mitigate the e ect of the disturbances on the attitude and orbit of the ASPECT satellite. 

  • Auchar Zardari, Muhammad
    et al.
    Quaid-e-Awam University of Engineering Science and Technology: Nawabshah, Pakistan.
    Mattsson, Hans
    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.
    Khalid, Muhammad S.
    Department of Urban Management, Kyoto University, Kyoto, Japan.
    Ask, Maria
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
    Lund, Björn
    Department of Earth Sciences, Uppsala University, Uppsala, Sweden.
    Numerical Analyses of Earthquake Induced Liquefaction and Deformation Behaviour of an Upstream Tailings Dam2017In: Advances in Materials Science and Engineering, ISSN 1687-8434, E-ISSN 1687-8442, 5389308Article in journal (Refereed)
    Abstract [en]

    Much of the seismic activity of northern Sweden consists of micro-earthquakes occurring near postglacial faults. However, larger magnitude earthquakes do occur in Sweden, and earthquake statistics indicate that a magnitude 5 event is likely to occur once every century. This paper presents dynamic analyses of the effects of larger earthquakes on an upstream tailings dam at the Aitik copper mine in northern Sweden. The analyses were performed to evaluate the potential for liquefaction and to assess stability of the dam under two specific earthquakes: a commonly occurring magnitude 3.6 event and a more extreme earthquake of magnitude 5.8. The dynamic analyses were carried out with the finite element program PLAXIS using a recently implemented constitutive model called UBCSAND. The results indicate that the magnitude 5.8 earthquake would likely induce liquefaction in a limited zone located below the ground surface near the embankment dikes. It is interpreted that stability of the dam may not be affected due to the limited extent of the liquefied zone. Both types of earthquakes are predicted to induce tolerable magnitudes of displacements. The results of the postseismic slope stability analysis, performed for a state after a seismic event, suggest that the dam is stable during both the earthquakes

  • de Bruin, Julia
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences.
    Lean projektverksamhet: En fallstudie utförd hos Vattenfall Vattenkraft2017Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Lean kan leda till ökad konkurrenskraft och produktivitet och har därför blivit ett välkänt begrepp som återfinns i många organisationer. Lean kan definieras som en verksamhetsstrategi, bestående av värderingar, principer, metoder och verktyg, med syfte att kontinuerligt förbättra och utveckla verksamheten. Lean härstammar från tillverkningsindustrin men kan och bör även appliceras i andra typer av verksamheter.

    Ett projekt kan definieras som en unik process bestående av ett antal samordnade och styrda aktiviteter, initierade för att uppnå ett mål som uppfyller specifika krav inklusive begränsningar i tid, kostnad och resurser. Det finns studier av Lean inom vissa typer av projekt, exempelvis produkt- och mjukvaruutveckling samt byggkonstruktion. Trots detta konstateras det i ett antal studier att det kvarstår mycket arbete med att utveckla principer, metoder och verktyg för tillämpning inom projektverksamheter. Syftet med denna studie är att utvärdera och ge rekommendationer för applicering av Lean inom en projektverksamhet.

    En fallstudie har genomförts av projektverksamheten på Vattenfall Vattenkraft, och deras arbete med att införa Lean. Fallstudien har bidragit till att skapa en djup förståelse för det generella konceptet, Lean projektverksamhet, i den specifika kontexten, Vattenfall Vattenkrafts projektverksamhet. För att skapa djupare förståelse för studiens ämnesområde och som underlag för analys av empiri har en teoretisk referensram byggts upp av vetenskapliga artiklar inom tre områden: Lean, projekt och Lean i projekt. Genom fokusgrupper, intervjuer och observationer har empiri, i avseende på hur Vattenfall Vattenkraft arbetar samt hur Lean, specifikt inom projektverksamheten, kan utvecklas.

    För att lyckas med en Lean-verksamhetsstrategi är det viktigt för projektverksamheten att ta tillvara på individernas erfarenheter och kunskaper. Samtidigt är det viktigt att hela organisationen arbetar för att skapa och kontinuerligt förbättra nuvarande standarder och arbetssätt och på så sätt bli en lärande organisation. I studien identifierades följande fem prioriterade principer som utgångspunkt för fortsatt införande av Lean:

    1. Tydliga kommunikationsflöden och processer som för upp problem till ytan.

    2. Standardisering av arbetssätt som en grund för ständiga förbättringar.

    3. Visuell styrning för att skapa en överblick och föra upp problem till ytan.

    4. Utveckla ledare som förstår arbetet, lever efter företagets filosofi och lär ut den till andra.

    5. Bli en lärande organisation genom att oförtröttligt reflektera och ständigt förbättra.

    För att tillämpa dessa principer rekommenderas bland annat följande Lean metoder och verktyg: värdeflödesanalys, standardisering, videomöten, avvikelsehantering, riskanalys, förbättringsförslag, förbättringsgrupper.

  • Winberg, Anna
    Luleå University of Technology, Department of Arts, Communication and Education.
    Små barns bildskapande i förskolan2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Studiens syfte är att få ökad kunskap om förskolemiljöns betydelse och förskollärarens förhållningssätt till, och syn på små barns bildskapande i förskolan. Det är en kvalitativ undersökning där sju förskollärare på två olika förskolor i samma kommun i Norbotten intervjuats skriftligt via e-post. Studien utgår även ifrån den soiokulturella teorin som betonar samspel med andra som viktigt för barns utveckling och lärande. Resultatet visar att förskollärarna ser på bildskapande som vikigt för små barns lärande och utveckling. Förskollärarna menar att genom bildskapande för barn till exempel möjlighet att uttrycka sina tankar oh känslor samt möjlighet att utveckla sin fantasi, motorik, språk, och samspel. Det framgår även att förskollärarna anser att bra material, avsatt tid för skapande och insprirerande vuxna är viktigt och ger goda förutsättningar. Resultatet visar vidare att förskollärarna anser att pedagogers inställning styr vilka material barnen får ta del av.

  • Scheepers, Gerhard
    et al.
    RISE Bioekonomi.
    Olsson, Jörgen
    RISE Bioekonomi.
    Lycken, Anders
    RISE Bioekonomi.
    Grahn, Thomas
    RISE Bioekonomi.
    Lundqvist, Sven-Olof
    RISE Bioekonomi.
    Hagman, Olle
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Hållfasthetsbestämning av virke med en NIR-kamera2017Report (Other academic)
  • Nyman, Oscar
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering.
    Towards a quality control for cloud top pressure and cloud top height products2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Cloud top height plays an important roll in the energy budget and is also important for aviation. This thesis concerns the quality control of cloud top height (CTH) retrievals. The approach for quality controlling retrieved CTH has been using the forward simulating software RTTOV. An error estimation function has been developed as well as an investigation to what simplifications can be done regarding the forward simulations for CTH purposes at SMHI. The purpose of the error estimation function is to validate CTH output from CTH retrieval algorithms by giving a rough error estimate of the retrieved CTH compared to what forward simulations predict. For simplifying the forward simulations the most promising results have been shown for lower clouds. Further testing is still of interest and for future work suggestions are provided regarding the error estimation function as well as for simplifying the forward simulations. 

  • Andersson, Terese
    Luleå University of Technology, Department of Arts, Communication and Education.
    Att tilldelas en position: - en studie om hur barn positioneras i förskolan utifrån kön och genus2017Independent thesis Basic level (university diploma), 210 HE creditsStudent thesis
  • Holmqvist, Viktor
    et al.
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences.
    Larsson, Alexandra
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences.
    Manliga och kvinnliga arbetsmiljöer: En genusrättsvetenskaplig jämförelse2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Den svenska arbetsmarknaden är trots försök att få en jämn fördelning av könen inom de olika yrkena starkt segmenterad. Media rapporterar om dåliga arbetsmiljöer på arbetsmarknaden och syftet med denna uppsats är att se om det föreligger en skillnad mellan typiskt manliga och kvinnliga arbetsmiljöer. För att kunna göra en jämförelse mellan typiskt manliga och kvinnliga arbetsmiljöer så har en definition gjorts på vad som är att anse som typisk manligt och kvinnligt utifrån statistik, på anställda och procentuell andel män och kvinnor. För att kunna se om det föreligger skillnad mellan typiskt manliga och kvinnliga arbetsmiljöer så har en undersökning av lagstiftning och föreskrifter på områdena gjorts. Vidare har en genusrättsvetenskaplig metod tillämpats för att se om det föreligger någon skillnad mellan typisk manliga och kvinnliga arbetsmiljöer och i dess reglering. 

    Resultatet har visat att beroende på om yrket finns inom det privata eller den offentliga sektorn föreligger det skillnader, vidare har det visats att en viss skillnad mellan typiskt manliga och kvinnliga yrken föreligger. 

  • Isaksson, Jonas
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Förbättringsåtgärder för en ökad talloljeproduktion vid Smurfit Kappa Piteå2017Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Sodapannan hos Smurfit Kappa Piteå är en av flaskhalsarna i produktionsflödet. Detta har till följd att tjockluten ackumulerar medan resterande lutar minskar, på grund av detta måste övriga enheter tidvis minska produktionen. Sodapannan har dessutom gett en varierad ångproduktion per ts (torrsubstans) lut vilket tros vara relaterat till lutens såpinnehåll, tidigare analyser påvisat stora variationer i avsåpning. Eftersom såpa har högre energivärde än svartlut ligger detta som grund till kopplingen mellan variationen i ångproduktion per ts lut och avsåpningen.

    Avskild såpa vidareförädlas till tallolja i hartskokeriet, Smurfit Kappa Piteå använder en HDS (hydrodynamisk separator) för att avskilja tallolja från spjälkvätska. Tallolja används bland annat för framställning av biodiesel och de senaste årens intresse för biobränslen har även bidragit med större fokus på talloljetillverkningen vid pappersbruken. Smurfit Kappa Piteå har på senare tid gjort två större förändringar som har en direkt påverkan på talloljeproduktionen. Avsåpningsparken har byggts ut och flödet av spjälkvätska har lagts om till efter avsåpning istället för före avsåpning. Företaget är därför intresserade av en djupare analys för att undersöka hur förändringarna påverkat talloljeproduktionen och vad som kan göras för att ytterligare förbättra den.

    I detta projekt undersöks förluster av såpa och tallolja till sodapannan, hur förlusterna påverkar ångproduktionen per ts lut samt möjliga förbättringsåtgärder för en ökad talloljeproduktion. För att utreda förlusterna genomfördes en kartering vid tio olika tillfällen där talloljeinnehåll i svartlut samt såpans talloljeinnehåll fastställdes. Från detta erhölls följande resultat; avsåpningens verkningsgrad var cirka 94 % i blandlutssteget och 0 % i mellanlutssteget. Medelutbytet av tallolja i hartskokeriet var 70 %. Resultatet från karteringen analyserades med SIMCA tillsammans med tillgängliga variabler som påverkar avsåpningen, ingen specifik variabel visades påverka avsåpningen i betydande grad. Via en sammanställning av tallolje- och såpförlusterna visades en förbättringspotential för ökad talloljeproduktion på 42 % över HDS:en och 4 % över blandlutssteget vid hypotetiska utbyten på 100 % för vardera enhet. Ur förlusterna beräknades även den extra belastning som erläggs sodapannan och hur ångproduktionen per ts lut varierade med avseende på detta. Variationen i ångproduktion per ts lut gick inte att korrelera till förlorad såpa och tallolja. Vid drift av HDS:en, bidrog dess talloljeförluster med 1,1 % ökning av medelenergi på brännluten samtidigt som förlusten av såpa vid avsåpning bidrog med en medelenergiökning på 0,3 %.

    Utöver detta undersöktes även talloljeproduktionen med avseende på massaproduktionen för perioden 2010-2016. Från detta kunde en tydlig årstidsvariation urskiljas. Totalutbytet av tallolja från massa hade stigit samtidigt som kvoten löv/barr minskat. De senaste månaderna påvisade ett minskat totalutbyte av tallolja från massan vilket kopplades till omläggning av spjälkvätska till efter avsåpning från att tidigare återinförts före avsåpning.

  • Nilimaa, jonny
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Bagge, Niklas
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Häggström, Jens
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Blanksvärd, Thomas
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Sas, Gabriel
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Täljsten, Björn
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Elfgren, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    More Realistic Codes for Existing Bridges2016In: IABSE CONGRESS, STOCKHOLM, 2016: Challenges in Design and Construction of an Innovativeand Sustainable Built Environment / [ed] Elfgren, Lennart; Jonsson, Johan; Karlsson, Mats; Rydberg-Forssbeck, Laja; Sigfrid, Britt, Zürich, 2016, 399-407 p.Conference paper (Refereed)
    Abstract [en]

    Examples are given from comparisons of analyses based on (1) code models, (2) finite element models and (3) full scale tests to failure of three bridges. The analyses based on the code models gave very conservative results, while the finite element models could better predict the real behaviour.

  • Abdollahpour, Nosrat
    et al.
    Department of Occupational Health Engineering, Tabriz University of Medical Sciences Tabriz, Iran.
    Helali, Faramarz
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Human Work Science.
    Implementing 'Awakened Need of Change' for Applying Ergonomics to Work System with Macroergonomics Approach in an Industrially Derveloping Country and its Meta-Reflection2016In: Journal of Ergonomics, ISSN 2165-7556, Vol. 6, no 6, 182Article in journal (Refereed)
  • Zanders, Hanna
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences.
    Ersättning vid ingripande av det allmänna: Särskilt inom vattenrättens område2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    1999 inkorporerades vattenlagen från 1983 i vad som skulle bli den nya miljöbalken. Anledningen till reformen av lagstiftningen var delvis på grund av att man ville förstärka miljöaspekten av vattenrätten som tidigare varit genomsyrad av ett exploateringstänk. I och med reformen kom även expropriationslagstiftningen att bli gällande för vattenrättsliga ersättningsfrågor och det 25 procentiga påslag på ersättningen som tillkom 2010. Syftet med denna framställning har varit att undersöka hur ovan nämnda reformer har påverkat äganderätten för den enskilde och förutsättningarna för ersättning när det kommer till ingripande av det allmänna, bland annat när det kommer till vattenrätt. För att genomföra detta har en rättsdogmatisk metod använts där grundlagar, lagar, förordningar, föreskrifter, propositioner och doktrin har använts för att utreda och analysera rättsläget samt jämföra med tidigare rätt. Genom införandet av miljöbalken har rätten blivit tydligare och mer lättförståelig samtidigt som äganderätten har stärkts.

  • Vu, Phi-Long
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering.
    Implementing a web-based bookingsystem using Go2016Independent thesis Basic level (professional degree), 180 HE creditsStudent thesis
    Abstract [en]

    The project investigated the advantages and disadvantages of Go while abooking system for Tieto was developed. The frameworks and APIs AngularJS,REST, JSON and mongoDB were used during the development of thebooking system. The result was a fully working stand-alone booking systemwith a login functionality. The back-end server was written in Go while thefront-end client was written in JavaScript using AngularJS.

  • Pusch, Roland
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Nakano, Masashi
    Yong, R.N.
    Yang, Ting
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Long-term function of on-ground repositories for hazardous waste: Mechanisms in cyclicdrying/wetting of top clay liners2017In: Journal of Earth Sciences and Geotechnical Engineering, ISSN 1792-9040, E-ISSN 1792-9660, Vol. 7, no 2, 45-62 p.Article in journal (Refereed)
    Abstract [en]

    Landfills of hazardous waste like radioactive rest products with low activity, or ashes from incinerated organic waste, need to have top clay liners for minimizing penetration and percolation of precipitated rain and meltwater. Temperature and dry weather vary interchangeably with wet periods making the clay desiccate and fissure, and subsequently wetted etc. Top liners are commonly made of smectite clay, which is the best isolating soil material, undergoing swelling and shrinkage to an extent that depends on the clay content and density. The most important question is whether such liners, in unfrozen condition and covered by erosionresisting coarse soil, maintain their coherence and tightness after centuries of hydration/dehydration cycles. The present study, made on physically confined soft Iraqi clay with about 30% smectite indicates that initially homogeneous dense clay shrinks and desiccates and becomes fissured at 30oC and room RH, but partly recovers by becoming water saturated by infiltrated water. A limited number of drying and wetting sequences seem to give approximately the same change, suggesting that, under common weather conditions and lack of external disturbance, such liners retain a considerable part of their initial water tightness. Thick liners with moderately to high density and exposed to loading by overlying coarse fill are expected to serve particularly well.

  • Udén, Andreas
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences.
    Leverantörers möjligheter och drivkrafter för innovation i byggprojekt: En multipel fallstudie i anläggningsbranschen2017Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Syftet med studien är att öka förståelsen hos entreprenörer och beställare för vilka möjligheter och drivkrafter för innovation som existerar inom byggprojekt. Den metod som används är en multipel fallstudie med induktiv ansats där semi-strukturerade intervjuer utfördes för att samla in empirisk data. Åtta innovationsklassade projekt från Trafikverket valdes ut att studeras. De olika projektenanalyseras och presenteras i tregrupper, ramavtal och underhållprojekt, Early contractor involvement projekt och styrda totalentreprenader. Resultatet presenterar de möjligheter, drivkrafter och barriärer för innovation som beställare och leverantör upplevt existerar i respektive byggprojekt. Ett teoretiskt ramverk används som analysmodell där nya möjligheter, drivkrafter och barriärer som identifierats i studien lyfts in och ordnas efter teman. De olika teman som identifierats innefattar ledning, kommunikation, kunskap, planering och förutbestämda betingelser. Studien bidrar till teorin genom att identifiera, tematisera och kategorisera möjligheter, drivkrafter och barriärer. Nya möjligheter, drivkrafter och barriärer har också identifierats i studien vilket bidrar till en ökad kunskap inom området. Studiens praktiska bidrag bidrar till en ökad kunskap om hur offentliga beställare kan främja innovation vid offentliga upphandlingar av byggprojekt. Det framgår tydligt att det finns många barriärer som försvårar skapandet av innovation i byggprojekt. Dock lyfts möjligheter som tidig marknads dialog, inkludera entreprenör i projekteringsfasen och hög samarbetsnivå fram som nyckelfaktorer för att skapa innovation i byggprojekt.

  • Savci, Ninorta
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences.
    Familjer med missbruk: Barnens rätt till skydd, stöd och omsorg2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • Campbell, Alex
    et al.
    Glencore Copper.
    Thurley, Matthew
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Application of laser scanning to measure fragmentation in underground mines2017In: Mining Technology, ISSN 1474-9009, E-ISSN 1743-2863Article in journal (Refereed)
    Abstract [en]

    The particle size distribution of fragmented rock in mines significantly affects operational performance of loading equipment, materials handling and crushing systems. A number of methods to measure rock fragmentation exist at present, however these systems have a number of shortcomings in an underground environment. This paper outlines the first implementation of high resolution 3D laser scanning for fragmentation measurement in an underground mine. The system is now used routinely for fragmentation measurement at the Ernest Henry sublevel-cave mine following extensive testing and calibration. The system is being used to study the effects of blasting parameters on rock fragmentation to optimise blast design. Results from 125 three dimensional scans measured the average P50 and P80 to be 230mm and 400mm respectively. The equipment, methodology and analysis techniques are described in detail to enable application of the measurement system at other mines.