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  • 1.
    Abboud, Mohamad Moulham
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Simulation of 3ph induction motor in Matlab with Direct and Soft starting methods.2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Asynchronous machines are considered nowadays the most commonly used electrical machines, which are mainly used as electrical induction motors. Starting the induction motor is the most important and dangerous step. The theory behind this project is based on representing the real motor by a set of equations and values in Matlab using the subsystem feature, forming a corresponding idealistic motor in a way where all the physical effects are similar. The motor is started under different loads in two methods: Direct and Soft starting. Each method is studied and discussed using supporting simulation of currents, torque, speed, efficiency and power factor curves.

  • 2.
    Abdul Hamid, Kamila
    Linnaeus University, Faculty of Technology, Department of Informatics.
    Gränssnittets betydelse i främjandet av kognitiv bearbetning: En undersökning om praktisk utnyttjande av designprinciper i skapandet av webbgränssnitt2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Många webbgränssnitt idag misslyckas med att möta användarnas behov och blir därför bristfälliga gällande användarvänligheten. Detta leder till att användarna begår stora misstag och anstränger sig vid användningen av webbaserade system. Visuell design och struktur i ett gränssnitt spelar en stor roll i hur användarna förstår sig på och tolkar ett gränssnitt då de avser hur olika beteenden och information kommuniceras till användarna. I denna studie undersöks hur visuell design, struktur och användbarhet i ett gränssnitt underlättar användarnas kognitiva bearbetning av information vid utförande av komplexa uppgifter. Studien har utförts genom ett uppdrag för Ahltorpmedia AB, som skapar lösningar för bl.a. webbplatser, webbaserade system och e-handel. Uppdraget har varit att förbättra en av deras egen utvecklade tjänst Nuhet som är bristfällig gällande områdena ovan.

     

    Först har en heuristisk utvärdering av Nuhets befintliga gränssnitt samt sju intervjuer med tjänstens befintliga- och potentiella användare inom huvudområdena visuell design, struktur och kognitiv bearbetning av information gjorts. Resultaten från intervjuerna och utvärderingen har använts för att bilda en persona varefter fokusområden för prototyparbetet har skapats. Sedan har en prototyp på Nuhets nya utseende och en ny funktionalitet skapats. Designprinciper för användbarhet samt gestaltlagar har nyttjats i skapandet av Nuhets nya gränssnitt.

     

    Utifrån de metoder som har genomförts i detta examensarbete har det framkommit att det beror på flera faktorer gällande hur användarnas kognitiva bearbetning av information underlättas med hjälp av visuell design, struktur och användarvänlighet. Dessa är då en bra struktur, gruppering och organisering av innehåll i ett gränssnitt. Dessutom är det tydliga kontraster, bra färgval och standardisering som underlättar den. 

  • 3.
    Abdula, Sham
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Oksman, Dan
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Attefallshus som komplementbostadshus: Drömhus eller mardröm?2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Den 2 juli 2014 blev det enligt lag tillåtet för en- och tvåbostadshusägare att uppföra en bygglovsbefriad komplementbyggnad på max 25 kvadratmeter på den egna fastigheten. Rapporten undersöker vilket genomslag lagändringen har haft i Stor-Stockholm, Stor-Göteborg och Stor-Malmö. Undersökningen visar att lagändringen ännu inte har haft något stort genomslag. I rapporten undersöks även en utvald del av marknadsaktörers utbud av attefallshus avsett som komplementbostadshus. 

    Ett attefallshus utformas med miljövänligt hållbara material och inspireras av Vitruvius tre principer för god arkitektur. Huset konstrueras med avsikt att uppfylla kraven som ställs i PBL, PBF, BBR och EKS. Målet med de framtagna bygghandlingarna är att få startbesked från byggnadsnämnden i Växjö. 

  • 4.
    Abdulrazaq, Erol
    et al.
    Linnaeus University, Faculty of Technology, Kalmar Maritime Academy.
    Henrik, Persson
    Linnaeus University, Faculty of Technology, Kalmar Maritime Academy.
    Syresättning av avloppsvatten: En undersökning av luftningsmetoder på reningsverk2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This essay has been done at the request of Marinfloc AB. It consists of various measurements and experiments investigating the sewage water treatment on a number of different plants. The measurements were executed in the part of the plants called secondary treatment. The objective with secondary treatment is to let micro-organisms remove dissolved and suspended biological and organic matter. The factors which were investigated were which methods are used to oxygenate the sewage water, what level of oxygen saturation is obtained with each method and the power consumption required oxygenating the sewage water. An experiment was carried out on Marinflocs’ own sewage treatment plant with the objective to determine if there is any time difference in oxygenating pure water versus unprocessed sewage water. The conclusion reached was that the four land-based sewage treatment plants that were investigated oxygenate by the same principle. The oxygenation is done by aeration from the bottom in respective aeration tank. The level of oxygen saturation was between 1, 8 – 5, 9 mg oxygen per liter sewage water in all plants. Marinflocs’ current sewage treatment plant uses another principle to oxygenate and its oxygen saturation was measured to a level of 12 mg/l. The experiment on Marinflocs’ own sewage treatment plant concluded that there is a time difference in oxygenating pure water versus unprocessed sewage water. The pure water gets oxygenated faster. 

  • 5.
    Abedan Kondori, Farid
    et al.
    Umeå universitet.
    Yousefi, Shahrouz
    KTH Royal Institute of Technology.
    Li, Haibo
    KTH Royal Institute of Technology.
    Direct three-dimensional head pose estimation from Kinect-type sensors2014In: Electronics Letters, ISSN 0013-5194, E-ISSN 1350-911X, Vol. 50, no 4, 268-270 p.Article in journal (Refereed)
    Abstract [en]

    A direct method for recovering three-dimensional (3D) head motion parameters from a sequence of range images acquired by Kinect sensors is presented. Based on the range images, a new version of the optical flow constraint equation is derived, which can be used to directly estimate 3D motion parameters without any need of imposing other constraints. Since all calculations with the new constraint equation are based on the range images, Z(xyt), the existing techniques and experiences developed and accumulated on the topic of motion from optical flow can be directly applied simply by treating the range images as normal intensity images I(xyt). In this reported work, it is demonstrated how to employ the new optical flow constraint equation to recover the 3D motion of a moving head from the sequences of range images, and furthermore, how to use an old trick to handle the case when the optical flow is large. It is shown, in the end, that the performance of the proposed approach is comparable with that of some of the state-of-the-art approaches that use range data to recover 3D motion parameters.

  • 6.
    Abedan Kondori, Farid
    et al.
    Umeå University.
    Yousefi, Shahrouz
    Umeå University.
    Li, Haibo
    Umeå University.
    Gesture Tracking for 3D Interaction in Augmented Environments2011In: Proceeding of The Swedish Symposium on Image Analysis (SSBA2011), Linköping, Sweden, 2011Conference paper (Other academic)
  • 7.
    Ablay, Talip
    Linnaeus University, Faculty of Engineering and Technology, Department of Mechanical Engineering.
    Maintenance Perception in Swedish SMEs (A local study in Kronoberg County)  2013Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Recognition of maintenance management as a significant factor holds the key to competitiveness in the global market irrespective of the size of the business. Maintenance management practices are primarily found in larger and multinational companies but the purpose of this paper is to investigate the maintenance practices that are used in SMEs of Sweden (Kronoberg County). The study is expected to expose the level of maintenance perception in the Swedish industry via a postal (and web based) questionnaire. The survey covered 74 company chosen from different sectors and produced a response rate of 20.3 percent. The main results achieved from the study show us difference between the maintenance perception and awareness of the maintenance. The respondents are aware of the importance of maintenance, but maintenance is still perceived as a necessary expense. Because according to the results of the survey the percentage of maintenance budget in comparison to the companies’ turnover is on average about 0.97% and it is very low. Again, when we look at the maintenance cost distribution of companies, spare parts and labour costs consist of 73 % of total maintenance cost, despite that they spend very little money for technology and training costs, their percentages in total cost are just 3% and 2%, also they still ignore statistical modelling (historical data) and condition monitoring. Moreover, just 27% of the participants use the maintenance key performance indicators (KPIs), and just 14% of them used basic KPIs which are used for measuring maintenance performance. There is a need to spend and invest more in maintenance especially they should invest more in technology and training to perform them. On the other hand, there is a need for choosing right maintenance strategy and service type, because these points are very important for an effective and economic maintenance management.

  • 8.
    Abraham, Erika
    et al.
    RWTH Aachen University, Germany.
    Bekas, Costas
    IBM Research, Switzerland.
    Brandic, Ivona
    Vienna University of Technology, Austria.
    Genaim, Samir
    Complutense University of Madrid, Spain.
    Johnsen, Einar
    University of Oslo, Norway.
    Kondov, Ivan
    Karlsruhe Institute of Technology, Germany.
    Pllana, Sabri
    Linnaeus University, Faculty of Technology, Department of Computer Science.
    Streit, Achim
    Karlsruhe Institute of Technology, Germany.
    Preparing HPC Applications for Exascale: Challenges and Recommendations2015In: Proceedings: 2015 18th International Conference on Network-Based Information Systems, NBiS 2015 / [ed] Barolli, L; Takizawa, M; Hsu, HH; Enokido, T; Xhafa, F, IEEE conference proceedings, 2015, 401-406 p.Conference paper (Refereed)
    Abstract [en]

    While the HPC community is working towards the development of the first Exaflop computer (expected around 2020), after reaching the Petaflop milestone in 2008 still only few HPC applications are able to fully exploit the capabilities of Petaflop systems. In this paper we argue that efforts for preparing HPC applications for Exascale should start before such systems become available. We identify challenges that need to be addressed and recommend solutions in key areas of interest, including formal modeling, static analysis and optimization, runtime analysis and optimization, and autonomic computing. Furthermore, we outline a conceptual framework for porting HPC applications to future Exascale computing systems and propose steps for its implementation.

  • 9.
    Abu Daqqa, Nizar
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Alan, Serkan
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    On the Requirements to Implement E-maintenance Cost effectively: Survey Study2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Nowadays, companies started to realize the impact of a good maintenance strategy on the production process. Quality, performance as well as availability are affected by maintenance; existing maintenance strategies help to optimize the production process to achieve high quality products with a low production cost. A new strategy of maintenance has immerged recently, e-maintenance provides an easy solution to follow up with maintenance, it provides condition monitoring, documentation, and it also gives you the best maintenance solution that fits your goals and vision. Articles related to e-maintenance was studied and analyzed to know the steps to implement a cost-effective e-maintenance. The authors came up with a model that describes the implementation process in three main steps.

  • 10.
    Acharya, Om Nath
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Upadhyaya, Sabin
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Space Time Coding For Wireless Communication2012Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    As the demand of high data rate is increasing, a lot of research is being conducted in the field of wireless communication. A well-known channel coding technique called Space-Time Coding has been implemented in the wireless Communication systems using multiple antennas to ensure the high speed communication as well as reliability by exploiting limited spectrum and maintaining the power. In this thesis, Space-Time Coding is discussed along with other related topics with special focus on Alamouti Space-Time Block Code. The Alamouti Codes show good performance in terms of bit error rate over Rayleigh fading channel. The performance of Altamonte’s code and MIMO capacity is evaluated by using MATLAB simulation.

  • 11.
    Adam, Stenlund
    et al.
    Linnaeus University, Faculty of Technology, Kalmar Maritime Academy.
    John, Barnekow
    Linnaeus University, Faculty of Technology, Kalmar Maritime Academy.
    Energieffektivisering av Ronneby is-arena samt vädrets termodynamiska påverkan2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Abstract

    Today Sweden has 341 ice hockey arenas, around 140 outdoor ice hockey rinks, 60 ice fields for bandy and about 35 curling arenas. In addition, the numbers of indoor bandy arenas are increasing. The cooling systems installed today should be able to lower its energy consumption with 10-30%.In this thesis, Ronneby ice-arena has been researched. This artificial cooling facility was inaugurated 2011 and is one of the newest in Sweden. This is an outdoor ice field for bandy and therefor has no roof or walls to cover the field. Ronneby ice-arena has problems with uneven cooling distribution of the ice field. This results in cracks and uneven ice quality. These problems also result in higher energy consumption than necessary.To find a solution for the uneven cooling of the ice field flow measurements were carried out in the brine circuit. To get a better understanding of the cooling distribution, temperature measurements were carried out on the brine feeding lines. A calculation has been performed on what energy savings a speed control of the brine circulation pumps depending on the outdoor temperature could generate. Another calculation was made to see the possible savings with a windshield around the field. In this thesis the benefits of a heat recovery system on the cooling compressors refrigerant has been investigated. The heat recovery system could heat the locker rooms, the clubhouse, the showers and the hot water for the Zambonis.In order to perform the necessary calculation for this thesis, Fredriksbergs BK and Ronneby municipality provided operating data.The actions proposed to Ronneby ice-arena to solve the uneven cooling of the ice field is to change the location of the brine feeding line connection point. At the same time this work is carried out it’s suggested that the brine feed and return lines get insulated. When the uneven cooling problems have been solved, a speed control system should be installed to control the brine circulation pumps, in order to lower the electricity consumption. Ronneby ice-arena has the possibility to install a heat recovery system. Therefore it is suggested to install a heat exchanger on each cooling compressor refrigerant. This installation is to be used to heat the clubhouse, the showers and the hot water for the Zambonis. The system to cool the condensers with seawater and currently the heat pump are not optimal designed. The installed heat pump does not work when the seawater temperature is below 5°C, therefore the system should be redesigned.

  • 12.
    Adamopoulos, Stergios
    Technological Educational Institute of Larissa, Greece.
    Fiber analysis techniques for sustainable manufacturing of corrugated board and packaging2006In: Proceedings of the 2006 Naxos International Conference on Sustainable Management and Development of Mountainous and Island Areas: 29th September - 1st October 2006, Island of Naxos, Greece / [ed] Evangelos I. Manolas, Democritus University of Thrace , 2006, Vol. 1, 1-9 p.Conference paper (Refereed)
    Abstract [en]

    Environmental – economic pressure and associated regulations have led to a significant increase of recycled paper as the main fibrous component of corrugated board the last years. Corrugating packaging industry is facing the challenge to enhance products derived from recycled pulp and to ensure a satisfactory strength of packages. Advanced techniques are highly needed for the evaluation of packaging fiber supply sources as well as for the utilization of the available resources in an optimal manner. As industrial packaging is based on the characteristics of its constituent fibers, information on the fiber composition of the recycled raw materials is of primary importance for a continual control of fiber sources. This paper reports on the usefulness of fiber analysis techniques as diagnostic methods for assessing the potential quality distribution of fibers for sustainable packaging manufacturing.

  • 13.
    Adamopoulos, Stergios
    AIDIMA, Spain.
    Identification of Fibre Components in Packaging Grade Papers2006In: IAWA Journal, ISSN 0928-1541, Vol. 27, no 2, 153-172 p.Article in journal (Refereed)
    Abstract [en]

    Environmental and economic issues have led to a significant increase of recycled paper as the main fibrous component of corrugated board the last years. Qualitative data on the different fibre types are needed for the evaluation of packaging fibre supply sources, which are becoming numerous and heterogeneous. Fifteen different packaging grade papers (7 linerboards and 8 corrugating medium) were selected to represent all the variety of papers available on the Spanish market. The origin of virgin and recycled fibres was identified by their morphological characteristics employing light microscopy and standard fibre analysis techniques. The waste-based papers (Waste based-liners and Fluting), Kraft-liners and Test-liner were highly variable containing 9–18 different wood and nonwood components. Semi-chemical, with 5–13 components, was the less variable grade. Hardwoods were identified as the most important fibre component from a quantitative standpoint. All papers contained in their hardwood mix Betula, Eucalyptus and Populus in significant amounts. Fagus sylvatica and Tilia were also frequently observed and in some papers were amongst major hardwood components. Prominent softwood components were found to be Pinus sylvestris, P. pinaster, P. radiata, Picea, Larix and in some papers Pinus nigra. The lower presence of a variety of softwood, hardwood and nonwood (mainly grasses) species and genera was due to the paper recycling process.

  • 14.
    Adamopoulos, Stergios
    Linnaeus University, Faculty of Technology, Department of Forestry and Wood Technology.
    Morphology, properties and recyclability of modified fibres and papers with different chemicals at laboratory, pilot plant and industrial trials2015Conference paper (Other (popular science, discussion, etc.))
  • 15. Adamopoulos, Stergios
    Quality control of packaging fiber sources2006Conference paper (Other academic)
  • 16. Adamopoulos, Stergios
    Quantification of softwood, hardwood and nonwood fibres in packaging grade papers2006In: TAPPI Journal, ISSN 0734-1415, Vol. 5, no 3, 27-32 p.Article in journal (Refereed)
    Abstract [en]

    This study determined percentages by weight of the fiber components in 15 papers commonly used to produce corrugating packaging in Spain. The papers are manufactured mainly from recycled raw materials. The percentages were determined by means of standard quantitative fiber analysis techniques and use of appropriate weight factors. Hardwoods were the major fiber component in all papers, except kraft liners, varying from 51% to 92% per weight. Kraft liners had greater softwood content (49%-69%)than hardwood, and the most plentiful softwood classes were pines. Douglas-fir was a contaminating fiber component (weight percentage less than 2%) in almost in every paper. Nonwood fibers, entering the papers through the recycling process, were a significant fiber component (2%-9%) in most of the papers, especially the waste-based papers (liners and flutings). Quantitative fiber composition reflects the differences in quality between the papers. Its usefulness could be further explored in the quality control of paper manufacturing for packaging.

    Application: Packaging grade papers incorporate a variety of wood and nonwood fiber types. Manufacturing of papers of consistent and acceptable quality requires knowledge concerning the quantity of each fiber used.

  • 17.
    Adamopoulos, Stergios
    TEI Thessaly, Greece.
    Recovery and utilization of wood and rubber at the end of their lifespan to produce innovative products2014In: Development and Business Prospects in Thessaly by Symbiotic Utilization of Agricultural and Industrial Solid Waste to Produce Materials and Energy, November 24, Larissa, Greece, 2014Conference paper (Other academic)
  • 18.
    Adamopoulos, Stergios
    et al.
    Linnaeus University, Faculty of Technology, Department of Forestry and Wood Technology.
    Birmpilis, D
    Technological Educational Institute of Thessaly.
    Use and properties of recovered paper raw materials for the production of corrugated board2015In: Proceedings of the 14th International Conference on Environmental Science and Technology Rhodes, Greece, 3-5 September 2015, Global NEST , 2015Conference paper (Refereed)
    Abstract [en]

    The difficulty of predicting the properties of paper products produced from heterogeneous sources puts several limitations, which therefore lead to severe economic losses and only a comprehensive characterization will enable their better utilization. The project “RF-CORRUG –Quality control of raw materials from recovered fibres for the production of corrugated board”under the NationalStrategic Reference Framework 2007–2013 ARCHIMEDES IIIdeals with this common technical problem of the corrugated board industry. Specifically, the mainobjective of the project is to supportthe competitiveness of the corrugated board companies (mainly SMEs)by creatinga software tool based on practical models that can predict packaging grade paper properties from fibre data (qualitative, quantitative, morphological) used in their production. This paper presents information on the physical and mechanical properties of recovered packaging papers used in corrugated packaging. A number of different category papers (liners, flutings) used for corrugated board production in Greece were examined. The required paper properties included grammage, porosity, bursting strength, SCT, tensile strength and tearing resistance, and were measured by internationally recognized testersand standards. The data will be used to develop predictive models based on advanced statistical methods for the properties and performance of packagingaccording to information of their recovered raw paper materials.

  • 19.
    Adamopoulos, Stergios
    et al.
    Linnaeus University, Faculty of Technology, Department of Forestry and Wood Technology.
    Foti, Dafni
    Aristotle University of Thessaloniki, Greece.
    Voulgaridis, Elias
    Aristotle University of Thessaloniki, Greece.
    Passialis, Costas
    Aristotle University of Thessaloniki, Greece.
    Manufacturing and properties of gypsum-based products with recovered wood and rubber materials2015In: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 10, no 3, 5573-5585 p.Article in journal (Refereed)
    Abstract [en]

    The experimental production of gypsum-based products (cylindrical samples, solid bricks) using different fractions of wood chips and rubber particles was studied. Recovered rubber and wood materials were mixed with gypsum and water in various proportions to fabricate gypsum-wood and gypsum-rubber cylindrical samples and standard solid bricks with six holes using appropriate molds. It was shown that to manufacture gypsum-wood and gypsum-rubber products with good mechanical strength, coarse fractions of wood and rubber should be used, but the proportion of wood or rubber should not exceed 25%. No thermal conductivity differences were found between the wood-and rubber-type of gypsum products, and particle size and material proportion had no effect. Samples with fine wood and rubber particles present at a lower proportion (25%) exhibited similar sound absorption behavior. The solid bricks had slightly higher strength when loaded at the large surface of their lateral upper side than when loaded at the small surface. The bricks provided better thermal insulation than both the extruded and pressed house bricks but lower than that of insulating bricks. The emission of volatile organic compounds out of the bricks was at an acceptable level according to regulations for construction products.

  • 20.
    Adamopoulos, Stergios
    et al.
    Linnaeus University, Faculty of Technology, Department of Forestry and Wood Technology.
    Karageorgos, Anthony
    Technological Educational Institute of Thessaly, Greece.
    Rapti, Elli
    Center for Research and Technology – Hellas (CERTH), Greece .
    Birbilis, Dimitris
    Technological Educational Institute of Thessaly, Greece.
    Predicting the Properties of Corrugated Base Papers Using Multiple Linear Regression and  Artificial Neural Networks2016In: Drewno, ISSN 1644-3985, Vol. 59, no 198, 61-72 p.Article in journal (Refereed)
    Abstract [en]

    The difficulty in predicting the properties and behaviour of paper products produced using heterogeneous raw materials with high percentages of recovered fibres poses restrictions on their efficient and effective use as corrugated packaging materials. This work presents predictive models for the mechanical properties of corrugated base papers (liner and fluting-medium) from fibre and physical property data using multiple linear regression and artificial neural networks. The most significant results were obtained for the prediction of the tensile strength of liners in the cross direction from the origin (wood type, pulp method) of the fibres using linear regression, and the prediction of the compressive strength of fluting-medium in the longitudinal (machine) direction, according to the short-span test, using a neural network with one hidden layer with 6 neurons, with coefficients of determination at 95.14% and 99.28%, respectively

  • 21.
    Adamopoulos, Stergios
    et al.
    Technological Educational Institute of Larissa, Greece.
    Mai, C
    From wood fibre modification to paper technology: properties of fibres modified with DMDHEU and glutaraldehyde2011In: 3rd biennial International Fibre Engineering Conference, 24 – 26 May, Barcelona, Spain, 2011Conference paper (Other academic)
  • 22.
    Adamopoulos, Stergios
    et al.
    AIDIMA, Spain.
    Martinez, E
    AIDIMA, Spain.
    Ramirez, D.
    AIDIMA, Spain.
    Characterization of packaging grade papers from recycled raw materials through the study of fibre morphology and composition2007In: Global NEST. International Journal, ISSN 1108-4006, Vol. 9, no 1, 20-28 p.Article in journal (Refereed)
    Abstract [en]

    The restrictions in availability of forest-based raw materials along with favourable environmental policies towards alternative sources of raw materials have forced corrugated packaging industry to shift towards recycled paper and other fibre sources such as non-wood and agro-residues. The variability in raw pulp materials with increasing percentages of recycled fibres is a very common technical problem for the corrugated packaging industry worldwide. Corrugating packaging production is facing the challenge to ensure a satisfactory strength of packages despite the increase of recycled paper as the main fibrous component. Sustainable manufacturing of papers of consistent and acceptable quality requests comprehensive characterization of the fibrous components, which are becoming more heterogeneous. Understanding the influence that heterogeneous recycled raw materials have on packaging grade paper properties offers great potential value to the corrugated board and packaging industry.

    57 linerboards and corrugating medium were selected to represent all the variety of paper grades available on the market at the moment for the production of corrugated board in Spain. The papers were analyzed for their fibre morphology (fibre length, fibre width, lumen diameter, cell wall width and flexibility) and fibre composition (softwood to hardwood and nonwood fibre count and weight) and their strength (compression, bursting and crushing resistance) was evaluated. All the determinations were in accordance with the relevant TAPPI Test Methods. The significant differences found in most of the anatomical characteristics, fibre composition and strength properties among the paper grades reflected the diverse raw materials used for their production as well as their qualitative differences. By means of simple correlation the influence of fibre characteristics and composition on the strength of the papers was determined under two different conditions, at 23 o C and 50% RH and at 20 o C and 90% RH.

    The results demonstrate that besides the physical-mechanical characterization of packaging grade papers, fibre anatomy and composition can be used successfully as a complementary practical test to predict the performance of papers. The application of the predicting correlations is proposed for the evaluation of the fibre supplies for the packaging industry. An enormous potential for cost reduction can be created by the selection of the most appropriate and inexpensive combination of grade papers for a specific packaging use

  • 23. Adamopoulos, Stergios
    et al.
    Mertinez, E
    Ramirez, D
    Characterization of packaging grade papers from recycled raw materials through the study of fibre morphology and composition2005In: Proceedings of the 9th International Conference on Environmental Science and Technology: Rhodes, Rhodes Island, Greece, 1 - 3 September 2005 ; Volume of Abstracts / [ed] University of the Aegean, 2005, Vol. A, 18-25 p.Conference paper (Refereed)
  • 24.
    Adamopoulos, Stergios
    et al.
    Technological Educational Institute of Karditsa, Greece.
    Oliver, José-Vicente
    AIDIMA, Spain.
    Fiber composition of packaging grade papers as determined by the Graff “C” staining test2006In: Wood and Fiber Science, ISSN 0735-6161, Vol. 38, no 4, 567-575 p.Article in journal (Refereed)
    Abstract [en]

    A qualitative and quantitative analysis of the fiber components of 15 representative papers that are used for the production of corrugated board was carried out by the Graff "C" staining test. The method of processing of softwood, hardwood, and nonwood fibers was determined under a light microscope by their color reactions with the stain. All papers, due to the use of recycled pulp raw materials in their manufacturing, were found to incorporate in their furnish fibers that had been produced with a variety of pulping processes: chemical, mechanical, and semi-mechanical. The recycled-based papers (recycled-liner and recycled-medium) were proved to be the most variable comprising 12-15 different fiber components, while in some of the semi-chemicals only up to 7 components were identified. The weight percentages of the fiber components calculated by the application of weight factors showed that in almost all papers the most important fiber component from a quantitative standpoint was hardwood unbleached kraft followed by softwood unbleached kraft. Besides hardwood unbleached semi-chemical pulp and mechanical softwood pulp that were also plentiful in the papers, there was a smaller number of other components which sum, however, accounted for a significant fraction in the total furnish weight. The results taken on the total softwood, hardwood, and nonwood fibers content of the papers demonstrate that Graff "C" staining test is adequate to analyze both the structure and quality of packaging grade papers in practical industrial testing.

  • 25. Adamopoulos, Stergios
    et al.
    Passialis, Costas
    Voulgaridis, Elias
    Fibre characteristics of papers used in European corrugated packaging industry2009In: ATIP. Association Technique de L'Industrie Papetiere, ISSN 0997-7554, Vol. 63, no 4, 14-21 p.Article in journal (Refereed)
  • 26. Adamopoulos, Stergios
    et al.
    Passialis, Costas
    Voulgaridis, Elias
    Fibre characteristics of papers used in European corrugated packaging industry2008Conference paper (Refereed)
  • 27. Adamopoulos, Stergios
    et al.
    Passialis, Costas
    Voulgaridis, Elias
    Oliver, JV
    Utilization of recycled fibre materials in the European corrugated packaging industrial sector2008In: 2nd International Conference on Engineering for Waste Valorisation WasteEng08, June 3-5, Patras, Greece, 2008Conference paper (Refereed)
  • 28. Adamopoulos, Stergios
    et al.
    Voulgaridis, E
    Passialis, C
    Morphology and identification of fibre furnish components of papers used in the production of corrugated board2013In: Celuloza Si Harti, ISSN 1220-9848Article in journal (Refereed)
  • 29.
    Adamopoulos, Stergios
    et al.
    Technological Educational Institute of Thessaly, Greece.
    Voulgaridis, Elias
    Aristotle University of Thessaloniki, Greece.
    Passialis, Costas
    Aristotle University of Thessaloniki, Greece.
    CARACTERISTICILE MATERIALULUI FIBROS ŞI PROPRIETĂŢILEHÂRTIEI RECICLATE FOLOSITE ÎN FABRICAREA CARTONULUIONDULAT: Morphology and identification of fibre furnish components of papers used in the production of corrugated board2013In: 7th International Symposium on Advanced Technologies for the Pulp, Paper and Corrugated Board Industry, 2013Conference paper (Refereed)
    Abstract [en]

    The manufacture of corrugated board containers (boxes, trays, etc.) involves a productionchain integrated by paper manufacturers, semi-elaborates (corrugated board) manufacturers andcontainer manufacturers, the majority of which in Europe are SMEs. Nowadays, corrugated boardcontainers are mostly manufactured with recovered paper. The greatest threat faced by thementioned production chain is related to the lack of quality and availability of recovered paper asraw material. Specifically, one of the most important properties of packaging paper is itsmechanical strength, which depends mostly on the length of the fibres of which paper iscomposed. These fibres are longer in virgin pulps (those coming from papers obtained fromwood, i.e. not yet recycled). However, the high pressure on the demand - as well as the currenteconomic and ecological restrictions in the use of forest based materials - has led to a situation inwhich very little quantity of virgin fibre enters the recycling chain. This means that the strengthquality of recycled fibres - and by extension of the papers - is constantly decreasing with the ongoingrecycling cycles. In addition, recovered paper presents a very high variability, whatconstitutes an obstacle when it comes to manufacturing containers having homogeneousproperties fixed by the customers at fixed costs. The difficulty of predicting the properties ofpaper products produced from heterogeneous sources puts several limitations, which thereforelead to severe economic losses and only a comprehensive characterization will enable their betterutilization. The project “RF-CORRUG – Quality control of raw materials from recovered fibresfor the production of corrugated board” under the National Strategic Reference Framework 2007–2013 ARCHIMEDES III deals with this common technical problem of the corrugated boardindustry. Specifically, the main objective of the project is to support the competitiveness of thecorrugated board companies (mainly SMEs) by creating a software tool based on practical modelsthat can predict packaging grade paper properties from fibre data (qualitative, quantitative, morphological) used in their production. This papers presents information on fibres (qualitativeand quantitative analysis, morphology) and packaging papers (physical and mechanicalproperties) used in corrugated packaging. A number of different category papers (liners, flutings) used for corrugated board production in Greece were examined. The main fibre characterizingtechniques, employed were fibre furnish analysis, morphological analysis of fibre, lightmicroscopy, scanning electron microscopy (SEM). In addition, zero span tensile test was done tomeasure the average fibre strength of fibre. The required paper properties were measured byinternationally recognized testers and standards. The data will be used to develop predictivemodels based on advanced statistical methods for the properties and performance of packagingpapers according to information of their fibres.

  • 30.
    Adamopoulos, Stergios
    et al.
    Greece.
    Voulgaridis, Elias
    Greece.
    Passialis, Costas
    Greece.
    Recycled Waste Paper and the Corrugated Packaging Industry in Europe2009In: Proceedings of 24th International Conference on Solid Waste Technology and Management: Philadelphia, PA USA, March 15-18, 2009, 2009, 400-411 p.Conference paper (Refereed)
  • 31.
    Adamopoulos, Sterigos
    et al.
    Democritus University of Thrace, Greece.
    Oliver, José-Vicente
    AIDIMA, Spain.
    Qualitative and quantitative fibre analysis in recycled raw materials for packaging2006In: Forest products journal, ISSN 0015-7473, Vol. 56, no 2, 58-60 p.Article in journal (Refereed)
    Abstract [en]

    Understanding the influence that heterogeneous recycled raw materials have on packaging-grade paper performance offers great potential value to the corrugated board and packaging industry. Fifty-seven linerboards and corrugating medium were selected to represent all the variety of paper grades available on the Spanish market at the moment for the production of corrugated board. The origin of softwood, hardwood, and nonwood fibers and their percentages by weight were determined with light microscopy and standard fiber analysis techniques.

  • 32.
    Adappan Ramu, Sasikala
    et al.
    Linnaeus University, Faculty of Technology, Department of Informatics.
    Narasingam Kuppusamy, Venkatesh
    Linnaeus University, Faculty of Technology, Department of Informatics.
    Exploring knowledge sharing in the Requirement Engineering phase of globally distributed Information Systems development: Perceived challenges and suggestions for improvement2016Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The Master thesis explores the knowledge sharing that takes place during the requirement engineering phase of globally distributed information systems development. In recent years, due to globalization, information systems development activities have become increasingly distributed across different geographical locations. Requirement engineering is an important and knowledge intensive phase in the development of information systems. Requirement engineering is the process of identifying, analyzing, documenting, validating and managing the requirements of a system. Effective and efficient knowledge sharing during the requirement engineering is vital for the successful development of information systems. However, the global distribution of the stakeholders has affected knowledge sharing during requirement engineering in various ways making it more challenging.

     

    Drawing on the theories of knowledge sharing within the field of information systems, this interpretive research study aims at exploring stakeholders’ perceptions about the challenges met during the knowledge sharing in requirement engineering phase of globally distributed information systems development projects. More specifically, this Master thesis explores the perceived challenges and generates a list of suggestions to overcome the challenges by conducting qualitative semi-structured interviews among the key stakeholders, both customers and business analysts.

     

    The findings indicate that the knowledge sharing is influenced by challenges such as cultural differences, language barriers, communication issues, coordination issues arising from multiple stakeholders, time difference and difficulty in sharing tacit knowledge in the globally distributed settings. Participants’ suggestions for overcoming these challenges include cultural trainings, kick off meetings, language trainings, use of translator, face-to-face communication and interaction, video conferencing, scheduling important meetings in the common suitable timings, identification of the main stakeholders, having a mediator and making close observations with face-to-face interactions.

     

     

    Keywords:  Information Systems, Information Systems Development, Requirement Engineering, Knowledge Sharing, Global Distribution, Outsourcing

     

     

  • 33.
    Adetayo-odepidan, Mojeed
    Linnaeus University, Faculty of Technology, Department of Informatics.
    Electronic Health Record Systems: A study of privacy in the region Kronoberg of Sweden2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This study gives a brief description of paper-based record and the adoption of ICT, which brought the introduction of Electronic Health Record System (EHRS) in Sweden, the challenges facing EHR in the health care sector around the world and what immigrants and newcomers who just arrived in Sweden knows about the privacy,  rights and the policies that protect their privacy and data system, these could cause them not having enough confidence in electronic health record system, they could also be worried about their information been exposed or disclosed by their healthcare providers, this call for the confidentiality, security and privacy of EHR System. The aim of this study is to explore immigrants and newcomers as users of electronic health record system by setting interview questions and focus group to help the researcher to understand their knowledge of what they know about the privacy of EHRS and what they know about the policies health care providers follow to protect patient’s privacy and data. It is very important for them to know their rights and the rights that protect their privacy and data from been shared or disclosed.

     

    The study also talked about the existing implications facing EHRs, comparison of both systems was shown in table 1 of this study. The necessity for a proper protection of patient data was discussed and recommendation was made towards having a great and a working electronic health record system. 

  • 34.
    Adolfsson, Beatrice
    et al.
    Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology.
    Johansson Mess, Marja
    Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology.
    Driftoptimering av lakvatten­­rening: Jämförelse mellan tekniker för uppvärmning av nitrifikationsdammen på Häringetorp avfalls­anläggning2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Biologisk lakvattenrening, med hjälp av mikroorganismer, används på Häringetorp avfallsanläggning för att bland annat reducera mängden kväve i lakvattnet. För att möjliggöra en längre reningsperiod, eftersom mikro­organismernas tillväxt hämmas vid låga temperaturer, vill Tekniska förvaltningen på Växjö kommun studera möjligheten att värma upp nitrifikationsdammen på Häringetorp avfallsanläggning med hjälp av grön energi.

    Kvantifiering av effektbehov för förlängning av reningsperioden har gjorts utifrån en simuleringsmodell. Studie av tillförd effekt har gjorts under det första året med tillförd effekt. Jämförelse mellan de tekniska lösningarna solfångare, värmepump och biobränslepanna har gjorts gällande aspekterna driftsäkerhet, praktisk genomförbarhet, enkelhet och ekonomi. Utifrån diskussion ges rekommendation att installera en värmepump, vilken utnyttjar intern energi, för att levererar en effekt till nitrifikationsdammen på 100 kW under temperaturstyrda förhållanden. Denna tillförsel av effekt förväntas ge en förlängning av reningsperioden på fyra veckor.  

  • 35.
    Adriansson, Mikael
    et al.
    Linnaeus University, Faculty of Technology, Kalmar Maritime Academy.
    Johansson Breeze, Peter
    Linnaeus University, Faculty of Technology, Kalmar Maritime Academy.
    Kommunicera säkert: En studie om kommunikation mellan lotsar, befälhavare och bogserbåtsbefälhavare2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The aim of this study was to examine how pilots, vessel masters and tugboat masters perceive the importance of verbal communication with consideration to safety and efficiency.  This is based on the fact that the vast majority of accidents involving vessels occur because of human error, where lack of communication plays a large part. In the study semi-structured interviews were held with two pilots, two masters and two tugboat masters. After conducting these six interviews it became apparent at the use of standard phrasing and closed loop communication could vary. Based on the information collected one conclusion is that if the usage within these two areas improved safety could increase. It was also apparent in this study that the knowledge of the English language differed greatly which also could lead to misunderstandings with the giving of instructions. A better proficiency in English and better knowledge of verbal communication could be two possible ways of increasing safety.

  • 36.
    Aflaki, Kamyar
    Linnaeus University, Faculty of Technology, Department of Computer Science.
    Penetration And Security Testing As A Mean To Securing Universal Web Applications2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The domain of Information Technology has been discussed focusing the security of in-formation based on web application. The main purpose of the paper is to pinpoint andexplain the main attacks on web applications. In the study the I have used real world webapplication to demonstrate different types of attacks and the ways of prevention againstthem. Cyber criminals are using certain tactics to gather sensitive information throughweb applications, thus it is important to study this domain of IT. Experiment has beenconducted to demonstrate the concept and achieved outcomes have been explained. It hasbeen concluded that the most of the web application vulnerabilities come from a bad de-sign, according to Microsoft Developer Network (MSDN) Design Guidelines for SecureWeb Applications, and most of the threats can be prevented by considering basics of webapplication security while designing the application.

  • 37.
    Afridi, Muhammad Zeeshan
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Umer, Muhammad
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Razi, Daniyal
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Design and simulation of beam steering for 1D and 2D phased antenna arrays using ADS.2012Independent thesis Advanced level (degree of Master (Two Years)), 30 credits / 45 HE creditsStudent thesis
    Abstract [en]

    Phased arrays eliminate the problems of mechanical steering by using fast and reliable electronic components for steering the main beam. Modeling and simulation of beam steering for 1D and 2D arrays is the aspect that is considered in this thesis. A 1D array with 4 elements and a 2D array with 16 elements are studied in the X-band (8-12 GHz). The RF front-end of a phased array radar is modeled by means of ADS Momentum (Advanced design system).

  • 38.
    Aggerstam, Elina
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Lehman, Karolina
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Materialvalets miljöpåverkan på transporten: En jämförelsestudie mellan transporter till flerfamiljshus i trä och betong.2017Independent thesis Basic level (university diploma), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [sv]

    Under året 2015 bedömde 240 av Sveriges 290 kommuner att det existerade ett underslott på bostäder. För att kunna möta behovet krävs det att många bostäder ska byggas på en kort tid. Med de klimathot som världen står inför krävs det att produktionen är uthållig och hållbar i längden. För att nå klimatmålen måste användandet av tunga fordon minskas, logistiken måste effektiviseras och alternativa transportmedel bör undersökas.

    Syftet med studien var att identifiera eventuella skillnader mellan byggnadsmaterialen trä och betong i transportledet. Med den insamalade datan togs olika relations- och nyckeltal fram som sedan utgjorde basen för de två formlerna som presenteras i studien.

    Resultatet av de olika relationstalen indikerar på att den lastade vikten inte har stor betydelse på hur mycket CO2 som släpps ut, utan att det är antalet transporter med tung lastbil som är grundproblemet till utsläppen och miljöpåverkan. Med formlerna som presenteras i studien kan antalet transporter som krävs till ett flerfamiljshus räknas ut, men även mängden CO2 som släpps ut vid fraktandet av planelementen.

  • 39.
    Ahlgren, Fredrik
    Linnaeus University, Faculty of Technology, Kalmar Maritime Academy.
    Waste heat recovery in a cruise vessel2016Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    In three studies of a cruise ship the author has investigated waste heat recovery (WHR)from exhaust gases using an organic Rankine cycle (ORC), and also mapped the energyand exergy flows within the ship. Data were collected from the ship’s machinerysystem for a total extent of one year, and this data were used for simulations andenergy calculations. An off-design analysis was made and an ORC was simulated andoptimised with regards to the ship’s operating conditions. The ORC working fluid wasoptimised in terms for maximum electrical production in the off-design condition. Theoff-design analysis showed that the ship speed and power consumption was far fromits original design. The results indicate that there is a potential for significant savingsby using an organic Rankine cycle for waste heat recovery. The energy and exergyanalysis gave a better understanding of the energy flows and showed that the singlelargest exergy destruction occurs in the ship’s diesel engines.

  • 40.
    Ahlgren, Fredrik
    et al.
    University of Kalmar, Kalmar Maritime Academy.
    Ahlgren, Kristoffer
    University of Kalmar, Kalmar Maritime Academy.
    Gasens inverkan på oljan i ett hydrauliksystem2009Independent thesis Basic level (degree of Bachelor), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [en]

    I detta arbete har vi med en litteraturstudie försökt påvisa vad en inblandad gas i oljan i ett hydrauliksystem har för betydelse för funktionen. Vi har använt information i traditionell facklitteratur samt i tidskrifter och vetenskapliga rapporter och upptäckt att problemen som uppkommer av inblandade gaser inte är väl kända. Dagens lösningar på problemen är nästan alltid kostsamma och handlar om att behandla symptomen. Vi har tittat på de olika fysikaliska data som gasen inverkar på i oljan, utifrån detta har vi analyserat vilka effekter detta har för ett hydrauliksystems funktion. Vi kommer att diskutera grundproblemet till kavitation och vanliga problem som ett hydrauliksystem ofta har. Vi har lyckats presentera resultat på att inblandad gas i oljan har en mycket stor inverkan på ett hydrauliksystem. Vi har kommit fram till att mycket av dagens problem med hydrauliksystem helt skulle kunna byggas bort om man tog större hänsyn till oljans förmåga att lösa in luft.

  • 41.
    Ahlgren, Fredrik
    et al.
    Linnaeus University, Faculty of Technology, Kalmar Maritime Academy.
    Mondejar, Maria E.
    Lund University.
    Genrup, Magnus
    Lund University.
    Thern, Magnus
    Lund University.
    Waste Heat Recovery in a Cruise Vessel in the Baltic Sea by Using an Organic Rankine Cycle: A Case Study2015In: ASME Turbo Expo 2015: Turbine Technical Conference and Exposition: Volume 3: Coal, Biomass and Alternative Fuels; Cycle Innovations; Electric Power; Industrial and Cogeneration, Montreal, Quebec, Canada, June 15–19, 2015, ASME Press, 2015, Vol. 3, 43392-43416 p., V003T06A018Conference paper (Refereed)
    Abstract [en]

    Maritime transportation is a significant contributor to SOx, NOx and particle matter emissions, even though it has a quite low CO2 impact. New regulations are being enforced in special areas that limit the amount of emissions from the ships. This fact, together with the high fuel prices, is driving the marine industry towards the improvement of the energy efficiency of current ship engines and the reduction of their energy demand. Although more sophisticated and complex engine designs can improve significantly the efficiency of the energy systems in ships, waste heat recovery arises as the most influent technique for the reduction of the energy consumption. In this sense, it is estimated that around 50% of the total energy from the fuel consumed in a ship is wasted and rejected in fluid and exhaust gas streams. The primary heat sources for waste heat recovery are the engine exhaust and the engine coolant. In this work, we present a study on the integration of an organic Rankine cycle (ORC) in an existing ship, for the recovery of the main and auxiliary engines exhaust heat. Experimental data from the operating conditions of the engines on the M/S Birka Stockholm cruise ship were logged during a port-to-port cruise from Stockholm to Mariehamn over a period of time close to one month. The ship has four main engines Wärtsilä 5850 kW for propulsion, and four auxiliary engines 2760 kW used for electrical consumers. A number of six load conditions were identified depending on the vessel speed. The speed range from 12–14 knots was considered as the design condition, as it was present during more than 34% of the time. In this study, the average values of the engines exhaust temperatures and mass flow rates, for each load case, were used as inputs for a model of an ORC. The main parameters of the ORC, including working fluid and turbine configuration, were optimized based on the criteria of maximum net power output and compactness of the installation components. Results from the study showed that an ORC with internal regeneration using benzene would yield the greatest average net power output over the operating time. For this situation, the power production of the ORC would represent about 22% of the total electricity consumption on board. These data confirmed the ORC as a feasible and promising technology for the reduction of fuel consumption and CO2 emissions of existing ships.

  • 42.
    Ahlgren, Fredrik
    et al.
    Linnaeus University, Faculty of Technology, Kalmar Maritime Academy.
    Mondejar, Maria E.
    Lund University.
    Genrup, Magnus
    Lund University.
    Thern, Marcus
    Lund University.
    Waste Heat Recovery in a Cruise Vessel in the Baltic Sea by Using an Organic Rankine Cycle: A Case Study2016In: Journal of engineering for gas turbines and power, ISSN 0742-4795, E-ISSN 1528-8919, Vol. 138, no 1, 011702Article in journal (Refereed)
    Abstract [en]

    Maritime transportation is a significant contributor to SOx,NOx, and particle matter (PM) emissions, and to a lesser extent, of CO2. Recently, new regulations are being enforced in special geographical areas to limit the amount of emissions from the ships. This fact, together with the high fuel prices, is driving the marine industry toward the improvement of the energy efficiency of ships. Although more sophisticated and complex engine designs can improve significantly of the energy systems on ships, waste heat recovery arises as the most effective technique for the reduction of the energy consump- tion. In this sense, it is estimated that around 50% of the total energy from the fuel con- sumed in a ship is wasted and rejected through liquid and gas streams. The primary heat sources for waste heat recovery are the engine exhaust and coolant. In this work, we present a study on the integration of an organic Rankine cycle (ORC) in an existing ship, for the recovery of the main and auxiliary engines (AE) exhaust heat. Experimental data from the engines on the cruise ship M/S Birka Stockholm were logged during a port-to- port cruise from Stockholm to Mariehamn, over a period of 4 weeks. The ship has four main engines (ME) W€artsil€ a 5850kW for propulsion, and four AE 2760kW which areused for electrical generation. Six engine load conditions were identified depending on the ship’s speed. The speed range from 12 to 14 kn was considered as the design condi- tion for the ORC, as it was present during more than 34% of the time. In this study, the average values of the engines exhaust temperatures and mass flow rates, for each load case, were used as inputs for a model of an ORC. The main parameters of the ORC, including working fluid and turbine configuration, were optimized based on the criteria of maximum net power output and compactness of the installation components. Results from the study showed that an ORC with internal regeneration using benzene as working fluid would yield the greatest average net power output over the operating time. For this situation, the power production of the ORC would represent about 22% of the total elec- tricity consumption on board. These data confirmed the ORC as a feasible and promisingtechnology for the reduction of fuel consumption and CO2 emissions of existing ships.

  • 43.
    Ahlgren, Fredrik
    et al.
    Linnaeus University, Faculty of Technology, Kalmar Maritime Academy.
    Österman, Cecilia
    Linnaeus University, Faculty of Technology, Kalmar Maritime Academy.
    A social sustainability perspective on an environmental intervention to reduce ship emissions2015In: Creating Sustainable Work-environments: Proceedings of NES2015, Nordic Ergonomics Society 47th Annual Conference, 01-04 November 2015, Lillehammer, Norway / [ed] Knut Inge Fostervold, Svein Åge Kjøs Johnsen, Leif Rydstedt, Reidulf G. Watten, 2015, A4-12-A4-15 p.Conference paper (Refereed)
    Abstract [en]

    This paper reports a case study examining the effects on the shipboard work environment of an operative decision to change fuel oil type on two Swedish passenger vessels operating in the Baltic Sea. The results show positive changes in work tasks, reduced exposure to harmful pollutants evaporating from the fuel, reduced use of chemicals for cleaning, and a generally cleaner work environment. The outcome illustrates the benefit of a systems perspective when evaluating environmental interventions. Here, the intervention can be seen as an investment that not only reduces emissions to the environment, but contributes towards sustainable working life at sea.

  • 44.
    Ahlgren, Tobias
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Eliassi, Jalal
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Värmeförluster vid utvändigt placerade ventilationssystem2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    To be able to handle tomorrows need for limited energy consumption we need to reduce our use of energy. The building sector stands for around 40 % of all energy consumption in the society. The government has put up a goal to reduce the energy consumption in our buildings with 20 % by year 2020 and 50 % by year 2050 compared with year 1995. To be able to do reach that goal we need a more energy efficient building stock.

    The main part of the energy used in our buildings is used for space heating. By installing ventilation systems with heat recovery on the exhaust air it is possible to use the heat-energy in the exhaust air to warm up the incoming air. This can contribute to a reduction in energy use.

    A ventilation system with heat recovery on the exhaust air is space demanding and there can be problems with finding enough space to do the installation indoors. Therefore it can be an advantage to place the aggregate and the ducts on the outside of the buildings climate shell. A placement exterior of the buildings climate shell or in an unheated space leads to thermal heat losses.

    The aim with this essay is to investigate how significant the heat losses are on exterior placed ventilation systems. The investigation has been done with help of theoretical calculations and measurements of the temperature difference in the ventilation ducts. Analysis has been made on life cycle costs on how to reduce the heat losses in an economic manner. To buildings, Höstvägen 14 and 22 in Växjö, which have been equipped with exterior placed ventilation systems have been studied. The two buildings have two different types of installation of the ducts.

    Our result shows that the heat losses through the ventilation systems on Höstvägen 14 and 22 are significant. The majority of the losses occur in the ducts. In the aggregate the thermal bridges in the framework accounts for the larger part.

  • 45.
    Ahlin, Jane
    et al.
    Swedish Ergonomics and Human Factors Society, Sweden.
    Österman, Cecilia
    Linnaeus University, Faculty of Technology, Kalmar Maritime Academy.
    Osvalder, Anna-Lisa
    Chalmers University of technology, Sweden.
    Hemphälä, Hilevi
    Lund University, Sweden.
    Glimne, Susanne
    Karolinska Insitutet, Sweden.
    Hägg, Göran M
    KTH Royal Institute of Technology, Sweden.
    Janzon, Olle
    SSAB Europe, Occupational Health & Safety.
    Pettersson, Per Johan
    Merident Optergo AB.
    Stavervik, Mathias
    Ericsson AB, Sweden.
    Strategies to develop and strengthen human factors and ergonomics knowledge among stakeholders in Sweden2015In: Proceedings 19th Triennial Congress of the IEA, Melbourne 9-14 August 2015, Melbourne: International Ergonomics Association , 2015Conference paper (Refereed)
    Abstract [en]

    Knowledge and application of human factors and ergonomics (HFE) has significant potential as auseful tool and solution provider in the development, design and implementation of safe, efficient and sustainable artefacts and systems. Yet, it seems that this HFE knowledge is not utilised to its full potential. In a world of competing financial and commercial priorities, HFE specialists have apparently not succeeded in selling the systems approach as a tool towards improved overall systems performance and human well-being.

    The present paper describes the strategic and practical workperformed by the Swedish Ergonomics and Human Factors Society (EHSS) to strengthen the quality of human factors and ergonomics knowledge and practice among various stakeholders in Sweden. EHSS view human factors and ergonomics as a systems and design oriented discipline that extends across all aspects of human activity. Beyond the traditional domains of specialization within the discipline, the physical, cognitive and organisational ergonomics, EHSS has identified three focus areas; visual ergonomics, voice ergonomics and ergonomics design for all.

    Practitioner Summary: This paper presents the strategic and practical work performed by the Swedish Ergonomics and Human Factors Society (EHSS) in order to strengthen the quality of human factors and ergonomics knowledge and practice in Sweden. EHSS has identified three focus areas for its strategic work: visual ergonomics, voice ergonomics and ergonomics design for all.

  • 46.
    Ahlin, Kjell
    et al.
    Saven EduTech AB.
    Brandt, Anders
    Saven EduTech AB.
    A smart way to analyze dynamic data2003In: Sound & vibration, ISSN 1541-0161, no February, 20-22 p.Article in journal (Other academic)
    Abstract [en]

    In recent years MATLAB® has become a common software tool for general computational mathematics, in universities as well as in industry. In the field of noise and vibration analysis, MATLAB is very common in universities, but perhaps a little less common in the industrial world. In this article some ideas are presented on how MATLAB can be successfully used for analyzing experimental noise and vibration data. Through the introduction of toolboxes in this field, the less experienced user can take advantage of the powerful functionality of MATLAB, either as the main tool or as a complement to the many excellent menu driven systems available on the market. Some of the advantages and disadvantages of using MATLAB versus menu driven systems are also discussed.

  • 47.
    Ahlin, Kjell
    et al.
    Blekinge Institute of Technology.
    Brandt, Anders
    Axiom EduTech AB.
    Lagö, Thomas
    A New MATLAB Toolbox for Simulation and Parameter Identification of Nonlinear Mechanical Systems2007In: IMAC-XXV: A Conference & Exposition on Structural Dynamics, February 19 – 22, 2007, Orlando, Florida USA, 2007Conference paper (Refereed)
  • 48.
    Ahlin, Klara
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Identifiering och visualisering av aktuella ämnen och sociala relationer i ett mikrobloggnätverk.: Riksdagspartiernas twitteranvändning inför riksdagsvalet 20102010Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Att enskilda politiker och partier väljer att använda sig av sociala medier i valsammanhang blir allt vanligare. I denna uppsats granskades de svenska riksdagspartiernas twitteranvändning inför det svenska riksdagsvalet 2010. Genom en social- och innehållsmässig analys kring twitteranvändandet kunde enskilda partiers kommunikationsmönster anas. Den sociala analysen baserades på relationen mellan en användares följare och följande, den innehållsmässiga på de taggar nätverkets mikroblogginlägg märkts med.

    Bland annat identifierades två partier med en ren tvåvägskommunikation, och ett parti med en klar envägskommunikation. Två av de undersökta partierna hade även tendenser till att rikta sin kommunikation mot en inre grupp av politiska twittrare. Den innehållsmässiga analysen pekade även på att de olika partiernas nätverk till viss del har en liknande sammansättning, politikerna hade en tendens att följa varandra och partispecifika taggar dök upp i samtliga av de analyserade partiernas nätverk. Datan använd i analysen hämtades med hjälp av en utvecklad prototyp.

  • 49.
    Ahlin, Kristofer
    Linnaeus University, Faculty of Technology, Kalmar Maritime Academy.
    Absorptionskylmaskiner ombord: En undersökning om absorptionsprocessens potential ombord fartyg2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Målet med denna undersökning är att teoretiskt undersöka den vatten/litiumbromidbaserade absorptionsprocessens potential ombord fartyg då processen enbart drivs av huvudmaskinens högtemperaturkylvatten. Undersökningen genomförs teoretiskt mot tre olika fartyg samt Sjöfartshögskolan i Kalmars maskinrumssimulator. För vardera fartyg undersöks driftenergikällan och kylbehovet ombord. Med det som underlag dras en slutsats om den vatten/ litiumbromidbaserade absorptionsprocessens potential ombord fartyget. Fartygens resultat ligger till grund för slutsatsen. Undersökningen visade att det finns potential för tekniken ombord undersökta fartyg.

  • 50.
    Ahlqvist, Carl
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Meijer, Niklas
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Identifiering av faktorer som kan påverka produktionseffektivitet: En fallstudie2015Independent thesis Basic level (university diploma), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    Manufacturing industries are today facing increasing competition through the globalization of the market that takes place. A global market with several competitors, increased product differentiation and the high cost of production makes great demands on companies to work cost effectively. To be competitive and operate a profitable production requires companies to have a great knowledge of how their manufacturing processes work, has a high reliability and can use their facility's capacity.

     

    The basis for the study is the industrial profitability problems in Sweden, where companies find it increasingly difficult to produce quality products at a competitive price. The case study performed in a company which manufactures components for the automotive industry, with the aim to create a better understanding of the factors that lead to production disruptions and has great effect on the production efficiency of a flow. In order to be able to counter them and exploit the capacity of a better way and create a high level of competitiveness and profitability.

     

    Based on the analytical study and first described the present situation of the case now. This is followed by an analysis of the current situation where empiricism is compared with the relevant theory. The analysis then reports the measured values ​​of the factors that lead to disturbances in the production flow and affect production efficiency. Finally, the evaluation factors and an explanation of what they are due to be clarified. It results that the case study demonstrates the significant factors affecting production efficiency, as well as the underlying causes of these should be tackled in order to create a higher level of reliability and production efficiency in the flow. Examination of factors and causes creates a basis for the improvements that should be applied to maintain profitable production and competitiveness.

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