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  • 1.
    ., .
    et al.
    Swedish Environmental Protection Agency. Melica.
    ., .
    Swedish Environmental Protection Agency. Sportfiskarna.
    Flodpärlmusslans status i Västra Götaland: En inventering av nio av länets musselvattendrag 20132014Report (Other academic)
    Abstract [sv]

    Under sommaren 2013 har Melica, och Sportfiskarna, på uppdrag av Länsstyrelsen Västra Götalands län inventerat flodpärlmussla i Enningdalsälven, Kolarebäcken, Sollumsån, Verkälven, Tattarströmmarna och Önnarp enligt metoden

    enkel statusbeskrivning. I Gärebäcken, Slereboån och Tidan har metoden statusbeskrivning använts. Syftet med övervakningen är att följa status och trender för de ingående vattendragen med avseende på flodpärlmussla och jämföra resultaten med tidigare inventeringar. Ett av vattendragen har inventerats tidigare, Gärebäcken, de resterande 8 är nyinventeringar.

  • 2. -, -
    Snabbt förändrade arbetsmiljöer kräver forskning som bidrar till bred kunskap och metodik.2018In: Arbetsmarknad & Arbetsliv, ISSN 1400-9692, Vol. 24, no 3-4, p. 85-89Article in journal (Other academic)
    Abstract [sv]

    I takt med arbetslivets snabba utveckling skapas fler och nya variationer av arbetsmiljöer som kan få helt olika betydelser för grupper på arbetsmarknaden. Inte minst då skillnader mellan grupper ökar. För att arbetsmiljöarbete ska bli verkningsfullt bör vi arbetslivsforskare minska fokus på övergripande medeltal där alla ”dragits över en kam” och istället satsa på mer arbetsplatsnära förhållningssätt om hur arbetsmiljöerna påverkar olika grupper och individer. Arbetslivsforskning behövs som kan ta sig an arbetslivets komplexa förändringar och bidra med bredare kunskaper till aktörerna som bedriver arbetsmiljöarbete – och att vi forskare samverkar med dessa aktörer.

  • 3.
    10, Grupp
    Halmstad University, School of Business and Engineering (SET).
    Pictoris2001Student paper second termStudent thesis
    Abstract [sv]
    Project Pictoris is a project that was offered to us by Proton Lighting AB. The projects main goal is to redesign their present flourecent armature Serie 33. As a group we were in agreement to the general apperance of our new design. We were given a free hand in the design and use of new materials. We decided to employ the use of aluminium profiles as the main body of our design. The use of the latest techniques was also discussed and implemented. The result we achived is a completely new apperance to the armatuer. A markable reduction in the amount of resources and time use in the manufacture of the final product was achived.
  • 4.
    120112 HONG, SISONG
    et al.
    University of Gävle, Faculty of Education and Business Studies, Department of Business and Economic Studies.
    LIN, SHUNZHAO
    University of Gävle, Faculty of Education and Business Studies, Department of Business and Economic Studies.
    Service Marketing in a cross-culture environment: a case of Elekta China2011Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
  • 5. A, Ahmad
    et al.
    G, Bianchi
    L, Bernstein
    G, Fodor
    G, Pujolle
    LB, Sung
    YD, Yao
    QoS support and service differentiation in wireless networks2004In: International Journal of Communication Systems, ISSN 1074-5351, E-ISSN 1099-1131, Vol. 17, no 6, p. 507-512Article in journal (Refereed)
  • 6.
    A, Akanji Morufu
    et al.
    Halmstad University, School of Business and Engineering (SET).
    Hossain, Md Delwar
    Halmstad University, School of Business and Engineering (SET).
    Marketing across border:: Internationalisation and Entry Strategies- The Swedish Perspective2006Independent thesis Advanced level (degree of Master (One Year))Student thesis
  • 7.
    A. Aljundi, Rachelle
    Umeå University, Faculty of Arts, Department of Creative Studies (Teacher Education).
    Bildklassresa mellan konststilar och epoker: om bildlärares konstsyn och teknikval i grundskolans bildundervisning2014Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The purpose of this study was to to examine what teachers think about visual art and how the learning process in this subject does look like. To answer these issues, I made interviews with five teachers of visual art from different schools, and I examined several examples of pupils’ artworks. The stories of the teachers were analyzed in relation to governing documents and with assumptions from sociocultural theory, postmodernism and pedagogical - aesthetic research as theoretical point of view.

    By the qualitative interview method, the observations of the pupil’s artworks, and by the analysis of the interviews with the teachers, I have come to the conclusion that teachers think differently about art but they try to keep themselves in line with the national governing documents. Its affects aspects of disciplines, styles, techniques and medium that is exemplified by the pupil’s art works, and it points out similarities and differences between the pupil’s art works and between the teachers when teaching visual art.

  • 8.
    A. Aljundi, Rachelle
    Umeå University, Faculty of Arts, Department of culture and media studies.
    Konst på internet idag: En retorikanalys av konstverksamma organisationers självpresentationer2014Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This is a qualitative study about Art transformation and commodification in the digital age. The study applies a rhetoric analysis with the aim to understand how art sellers, gallery owners and entrepreneurs take part in this transformation process through their websites’ presentation texts ”about us”. The analysis is related to communication theories but it is also inspired by other theories such as Gramsci’s hegemony theory and Bourdieu’s cultural critical theory. The study shows that in an environment of ”Global Communication”, activities that are related to the visual art on the net are strongly influenced by the commodification. Marketers and business managers have a big advantage of this phase of change in Art activities on the net. As senders in a one-way communication process, they use their rhetorical skills in their presentation texts to build identities or to enhance their business, depending on the positions of power they have in the market. They invest in art and artists, in order to expand their businesses and to capture a wider audience of recipients on World Wide Web to get more money and power. The study recommends further research about the Art commodification, preferably from the receiver’s and the artists’ sides to reveal more aspects of the effects of this transformation process in Art and its values.

  • 9. A. Alkhamisi, Mahdi
    et al.
    Shukur, Ghazi
    Jönköping University, Jönköping International Business School, JIBS, Economics. Statistik.
    A Monte Carlo Study of Recent Ridge Parameters2007In: Communications in statistics. Simulation and computation, ISSN 0361-0918, E-ISSN 1532-4141, Vol. 36, no 3, p. 535-547Article in journal (Refereed)
  • 10. A. Alkhamisi, Mahdi
    et al.
    Shukur, Ghazi
    Jönköping University, Jönköping International Business School, JIBS, Economics.
    Developing Ridge Parameters for SUR Model2008In: Communications in Statistics - Theory and Methods, ISSN 0361-0926, E-ISSN 1532-415X, Vol. 37, no 4, p. 544-564Article in journal (Refereed)
  • 11. A. Alkhamisi, Mahdi
    et al.
    Shukur, Ghazi
    Jönköping University, Jönköping International Business School, JIBS, Economics.
    The Effect of Fat-Tailed Error Terms on the Properties of the Systemwise RESET Test2008In: Journal of Applied Statistics, ISSN 0266-4763, E-ISSN 1360-0532, Vol. 35, no 1, p. 101-113Article in journal (Refereed)
  • 12.
    A Anthony, Martin
    et al.
    Örebro University, Swedish Business School at Örebro University.
    Ingjald, Tobias
    Örebro University, Swedish Business School at Örebro University.
    Handelsbanken: en studie om ledarskap2007Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 13.
    A Asif, Farazee M
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Machine and Process Technology.
    Circular Manufacturing Systems: A development framework with analysis methods and tools for implementation2017Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The society today lives on the philosophy of ‘take-make-use-dispose.’ In the long run, this is not sustainable as the natural resources and the waste carrying capacity of the earth are limited. Therefore, it is essential to reduce dependency on the natural resources by decoupling the growth from the consumption. In this venture, both the society and the manufacturing industry have a vital role to play. The society needs to shift towards Circular Economy that rests upon the philosophy of ‘take-make-use-reuse’ and the manufacturing industry has to be a major stakeholder in this shift. Despite being proven to be both economically and environmentally beneficial, successful examples of circular systems are few today. This is primarily due to two reasons; firstly, there is a lack of systemic and systematic approach to guide industries and secondly, there is a lack of analysis methods and tools that are capable of assessing different aspects of circular manufacturing systems. Taking on to these challenges, the objective of this research is to bring forward a framework with methods and decision support tools that are essential to implement circular manufacturing systems. The initial conceptual framework with the systemic approach is developed based on extensive review and analysis of research, which is further adapted for industrial implementation. Systematic analysis methods, decision support and implementation tools are developed to facilitate this adaptation. This development has been supported by four cases from diverse manufacturing sectors. Behind each decision support tool, there are analysis methods built upon mainly system dynamics principles. These tools are based on simulation platforms called Stella and Anylogic. Among other things, these tools are capable of assessing the performance of closed-loop supply chains, consequences of resource scarcity, potential gains from resource conservation and overall economic and environmental performance of circular manufacturing systems.

  • 14.
    A Asif, Farazee M
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Machine and Process Technology.
    Rashid, Amir
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Machine and Process Technology.
    Bianchi, Carmine
    University of Palermo (ITALY) Faculty of Political Sciences - Department of International Studies .
    Nicolescu, Mihai
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Machine and Process Technology.
    Performance analysis of the closed loop supply chain2012In: Journal of Remanufacturing, ISSN 2210-4690, Vol. 2, no 4Article in journal (Refereed)
    Abstract [en]

    Purpose

    The question of resource scarcity and emerging pressure of environmental legislations has brought a new challenge for the manufacturing industry. On the one hand, there is a huge population that demands a large quantity of commodities; on the other hand, these demands have to be met by minimum resources and pollution. Resource conservative manufacturing (ResCoM) is a proposed holistic concept to manage these challenges. The successful implementation of this concept requires cross functional collaboration among relevant fields, and among them, closed loop supply chain is an essential domain. The paper aims to highlight some misconceptions concerning the closed loop supply chain, to discuss different challenges, and in addition, to show how the proposed concept deals with those challenges through analysis of key performance indicators (KPI).

    Methods

    The work presented in this paper is mainly based on the literature review. The analysis of performance of the closed loop supply chain is done using system dynamics, and the Stella software has been used to do the simulation. Findings The results of the simulation depict that in ResCoM; the performance of the closed loop supply chain is much enhanced in terms of supply, demand, and other uncertainties involved. The results may particularly be interesting for industries involved in remanufacturing, researchers in the field of closed loop supply chain, and other relevant areas. Originality The paper presented a novel research concept called ResCoM which is supported by system dynamics models of the closed loop supply chain to demonstrate the behavior of KPI in the closed loop supply chain.

  • 15.
    A Atlasov, Kirill
    et al.
    Ecole Polytech Fed Lausanne, Lab Phys Nanostruct, CH-1015 Lausanne, Switzerland .
    Felici, Marco
    Ecole Polytech Fed Lausanne, Lab Phys Nanostruct, CH-1015 Lausanne, Switzerland .
    Karlsson, Fredrik
    Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, The Institute of Technology.
    Gallo, Pascal
    Ecole Polytech Fed Lausanne, Lab Phys Nanostruct, CH-1015 Lausanne, Switzerland .
    Rudra, Alok
    Ecole Polytech Fed Lausanne, Lab Phys Nanostruct, CH-1015 Lausanne, Switzerland .
    Dwir, Benjamin
    Ecole Polytech Fed Lausanne, Lab Phys Nanostruct, CH-1015 Lausanne, Switzerland .
    Kapon, Eli
    Ecole Polytech Fed Lausanne, Lab Phys Nanostruct, CH-1015 Lausanne, Switzerland .
    1D photonic band formation and photon localization in finite-size photonic-crystal waveguides2010In: OPTICS EXPRESS, ISSN 1094-4087, Vol. 18, no 1, p. 117-122Article in journal (Refereed)
    Abstract [en]

    A transition from discrete optical modes to 1D photonic bands is experimentally observed and numerically studied in planar photonic-crystal (PhC) L-N microcavities of length N. For increasing N the confined modes progressively acquire a well-defined momentum, eventually reconstructing the band dispersion of the corresponding waveguide. Furthermore, photon localization due to disorder is observed experimentally in the membrane PhCs using spatially resolved photoluminescence spectroscopy. Implications on single-photon sources and transfer lines based on quasi-1D PhC structures are discussed.

  • 16. A, Borgström
    et al.
    P, Nerfeldt
    Friberg, Danielle
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Surgical Sciences, Otolaryngology and Head and Neck Surgery.
    Questionnaire OSA-18 has poor validity compared to polysomnography in pediatric obstructive sleep apnea.2013In: International Journal of Pediatric Otorhinolaryngology, ISSN 0165-5876, E-ISSN 1872-8464Article in journal (Refereed)
  • 17.
    A. Darroudi, Kian
    Örebro University, School of Humanities, Education and Social Sciences.
    Totala institutioner: sociala hinder och dilemman2009Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 18.
    A Ekström, Annelie
    Linnaeus University, Faculty of Health, Social Work and Behavioural Sciences, School of Education, Psychology and Sport Science.
    Att arbeta integrerat med asylbarn i allmän förskola: En kvalitativ studie baserad på lärarintervjuer2013Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Syftet med föreliggande studie var att vinna kunskap om och ge en bild av hur sex pedagoger inom förskolan upplever att det är att arbeta integrerat med asylbarn i den allmänna förskolan och att ge en bild av vad pedagogerna berättar om hur detta arbete organiseras.  För att få svar på studiens frågor har en kvalitativ forskningsintervju använts. Två forskningsfrågor skapades från vilka intervjufrågorna huvudsakligen formades. Forskningsfrågorna var: Vilka förutsättningar för arbetet med asylbarn ger pedagogerna uttryck för och på vilket sätt organiseras den allmänna förskolan för asylbarn. Som analysredskap i studien har den sociokulturella och den interkulturella teorin använts. Studiens resultat visar att integreringen av asylbarn i den allmänna förskolan innebär att pedagogerna har att förhålla sig till att arbeta med asylbarn och deras föräldrar utan att dela språk eller känna till mycket om deras bakgrund. De måste också arbeta i en barngrupp som kan vara extra rörlig och instabil till storlek och dagsform. Resultatet visar också att den goda intention som det är att asylbarnen ska få komma varje dag till den allmänna förskolan gör att tiden på förskolan blir för kort för att pedagogerna ska kunna arbeta mer planerat med asylbarnens språk och egna kultur.

  • 19.
    A Elhassan, Amro
    KTH, School of Electrical Engineering (EES).
    Building automation and control2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 20. A, Eriksson
    et al.
    G, Fodor
    A middlebox control plane framework for wireless and mobile IP networks2004In: 2004 International Conference on Parallel Processing Workshops, 2004 (ICPP 2004 Workshops) / [ed] IEEE, New York: IEEE conference proceedings, 2004, p. 322-329Chapter in book (Other academic)
    Abstract [en]

    In wireless and mobile IP networks there is a need to support a set of functions that are related to wireless QoS provisioning, resource optimizations, mobility and security management and operator policy enforcement. These requirements have lead to the frequent usage of so called middleboxes including header/payload compressors, performance enhancement proxies, tunnel endpoints, packet filters and redirectors, QoS schedulers and others. Unfortunately, the increasing usage of these types of devices often leads to undesirable artifacts called feature interactions. In this paper we propose a framework that aims to coordinate the operation of middleboxes such that feature interactions are avoided. The three main ideas are (1) the separation of the control plane from the distributed network nodes, (2) the usage of a middlebox function independent horizontal protocol that allows mobile hosts to communicate their desired service requests to the network and (3) the usage of a vertical protocol between the network control and user planes. We present two examples in which this framework helps eliminate the risk for feature interactions. We comment on the relationship between the end-to-end principle and this framework. Finally, we discuss how future middleboxes can fit into this framework.

  • 21.
    A, Fredrik
    et al.
    KTH, School of Electrical Engineering (EES).
    Forsberg, A
    KTH, School of Electrical Engineering (EES).
    Forsén, Tobias
    KTH, School of Electrical Engineering (EES).
    Tracking Using Wireless Camera Networks2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 22.
    A. Hedqvist, Anja
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Arts, Department of ALM.
    Kommuner & Facebook: Hur hanteras regelverket kring allmänna handlingar?2010Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The aim of this one-year master thesis in archival science was to examine how municipalities take regulations concerning public records into account when they use Facebook. Another aim was to examine the involvement of archivists, registrars or similar staff in the management of the regulations. Since Swedish archival theory and practice has a close connection to the application of these regulations, such an examination was hopefully going to reveal tendencies of importance for archival science. The method used to collect information was a web questionnaire and the result was based on answers from 21 municipalities with an official Facebook page. The questionnaire showed that six of the municipalities regarded documents originating from their Facebook page as public records. Three did not, and a large group had not yet decided how to treat these documents. Only three municipalities did archive documents from Facebook. The involvement of archivists, registrars and similar personnel was generally very small, even though regulations concerning public records had more often been taken into account in the municipalities that had informed this personnel about the use of an official Facebook page. The difference in management between the municipalities was together with the demand for national guiding principles indicating difficulties in applying the regulations to social medias like Facebook. The fact that most of the municipalities that had taken the regulations into account had come to the conclusion that Facebook generated public records, together with the fact that national guiding principles presented during the work with this thesis had the same interpretation, indicated that documents originating from Facebook will be a part of Swedish public records in the future. The difference in management and the demand for guidance also indicated a need for better division of responsibilities and a more active approach in the future, to ensure that the regulations concerning public records are taken into account early and correctly when authorities starts to use new medias.

  • 23.
    A Herrera, I
    et al.
    Norwegian University Science and Technology NTNU.
    Woltjer, Rogier
    Linköping University, Department of Computer and Information Science, CSELAB - Cognitive Systems Engineering Laboratory. Linköping University, The Institute of Technology. Linköping University, Department of Computer and Information Science, Human-Centered systems.
    Comparing a multi-linear (STEP) and systemic (FRAM) method for accident analysis2010In: RELIABILITY ENGINEERING and SYSTEM SAFETY, ISSN 0951-8320, Vol. 95, no 12, p. 1269-1275Article in journal (Refereed)
    Abstract [en]

    Accident models and analysis methods affect what accident investigators look for, which contributory factors are found, and which recommendations are issued. This paper contrasts the Sequentially Timed Events Plotting (STEP) method and the Functional Resonance Analysis Method (FRAM) for accident analysis and modelling. The main issue addressed in this paper is the comparison of the established multi-linear method STEP with the new systemic method FRAM and which new insights the latter provides for accident analysis in comparison to the former established multi-linear method. Since STEP and FRAM are based on a different understandings of the nature of accidents, the comparison of the methods focuses on what we can learn from both methods, how, when, and why to apply them. The main finding is that STEP helps to illustrate what happened, involving which actors at what time, whereas FRAM illustrates the dynamic interactions within socio-technical systems and lets the analyst understand the how and why by describing non-linear dependencies, performance conditions, variability, and their resonance across functions.

  • 24. A. Hosseini, V.
    et al.
    Karlsson, L.
    Örnek, Cem
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science. Swerea KIMAB AB.
    Reccagni, P.
    Wessman, S.
    Engelberg, D.
    Microstructure and functionality of a uniquely graded super duplex stainless steel designed by a novel arc heat treatment method2018In: Materials Characterization, ISSN 1044-5803, E-ISSN 1873-4189, Vol. 139, p. 390-400Article in journal (Refereed)
    Abstract [en]

    A novel arc heat treatment technique was applied to design a uniquely graded super duplex stainless steel (SDSS), by subjecting a single sample to a steady state temperature gradient for 10 h. A new experimental approach was used to map precipitation in microstructure, covering aging temperatures of up to 1430 °C. The microstructure was characterized and functionality was evaluated via hardness mapping. Nitrogen depletion adjacent to the fusion boundary depressed the upper temperature limit for austenite formation and influenced the phase balance above 980 °C. Austenite/ferrite boundaries deviating from Kurdjumov–Sachs orientation relationship (OR) were preferred locations for precipitation of σ at 630–1000 °C, χ at 560–1000 °C, Cr2N at 600–900 °C and R between 550 °C and 700 °C. Precipitate morphology changed with decreasing temperature; from blocky to coral-shaped for σ, from discrete blocky to elongated particles for χ, and from polygonal to disc-shaped for R. Thermodynamic calculations of phase equilibria largely agreed with observations above 750 °C when considering nitrogen loss. Formation of intermetallic phases and 475 °C-embrittlement resulted in increased hardness. A schematic diagram, correlating information about phase contents, morphologies and hardness, as a function of exposure temperature, is introduced for evaluation of functionality of microstructures.

  • 25.
    A. Hosseini, Vahid
    et al.
    University West, Sweden ; Innovatum AB, Sweden.
    Karlsson, Leif
    University West, Sweden.
    Örnek, Cem
    RISE - Research Institutes of Sweden, Materials and Production, KIMAB. KTH Royal Institute of Technology, Sweden.
    Reccagni, Pierfrance
    The University of Manchester, UK.
    Wessman, Sten
    University West, Sweden.
    Engelberg, Dirk
    The University of Manchester, UK.
    Microstructure and functionality of a uniquely graded super duplex stainless steel designed by a novel arc heat treatment method2018In: Materials Characterization, ISSN 1044-5803, E-ISSN 1873-4189, Vol. 139, p. 390-400Article in journal (Refereed)
    Abstract [en]

    A novel arc heat treatment technique was applied to design a uniquely graded super duplex stainless steel (SDSS), by subjecting a single sample to a steady state temperature gradient for 10 h. A new experimental approach was used to map precipitation in microstructure, covering aging temperatures of up to 1430 °C. The microstructure was characterized and functionality was evaluated via hardness mapping. Nitrogen depletion adjacent to the fusion boundary depressed the upper temperature limit for austenite formation and influenced the phase balance above 980 °C. Austenite/ferrite boundaries deviating from Kurdjumov–Sachs orientation relationship (OR) were preferred locations for precipitation of σ at 630–1000 °C, χ at 560–1000 °C, Cr2N at 600–900 °C and R between 550 °C and 700 °C. Precipitate morphology changed with decreasing temperature; from blocky to coral-shaped for σ, from discrete blocky to elongated particles for χ, and from polygonal to disc-shaped for R. Thermodynamic calculations of phase equilibria largely agreed with observations above 750 °C when considering nitrogen loss. Formation of intermetallic phases and 475 °C-embrittlement resulted in increased hardness. A schematic diagram, correlating information about phase contents, morphologies and hardness, as a function of exposure temperature, is introduced for evaluation of functionality of microstructures. 

  • 26.
    A Hulten, Maj
    et al.
    University Warwick, Warwick Med Sch, Coventry CV4 7AL, W Midlands England .
    Patel, Suketu
    University Warwick, Department Biol Science, Coventry CV4 7AL, W Midlands England .
    Jonasson, Jon
    Linköping University, Department of Clinical and Experimental Medicine, Molecular and Immunological Pathology . Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Centre for Laboratory Medicine, Department of Clinical Pathology and Clinical Genetics.
    Iwarsson, Erik
    Karolinska University Hospital, Karolinska Institute, Department Mol Med and Surg, Clin Genet Unit, S-17176 Stockholm, Sweden .
    On the origin of the maternal age effect in trisomy 21 Down syndrome: the Oocyte Mosaicism Selection model2010In: Reproduction, ISSN 1470-1626, E-ISSN 1476-3990, Vol. 139, no 1, p. 1-9Article, review/survey (Refereed)
    Abstract [en]

    We have recently documented that trisomy 21 mosaicism is common in human foetal ovaries. On the basis of this observation we propose that the maternal age effect in Down syndrome (DS) is caused by the differential behaviour of trisomy 21 in relation to disomy 21 oocytes during development from foetal life until ovulation in adulthood. in particular, we suggest that trisomy 21 oocytes, lagging behind those that are disomic, may escape the timed pruning of the seven million in foetal life to the 300-400 finally selected for ovulation. The net effect of this preferential elimination will be an accumulation of trisomy 21 oocytes in the ovarian reserve of older women. We here highlight the implications of this Oocyte Mosaicism Selection (OMS) model with respect to the prevalent view that the maternal age effect is complex, dependent on many different biological and environmental factors. We examine conclusions drawn from recent large-scale studies in families, tracing DNA markers along the length of chromosome 21q between parents and DS children, in comparison to the OMS model. We conclude that these family linkage data are equally compatible with the maternal age effect originating from the accumulation of trisomy 21 oocytes with advancing maternal age. One relatively straightforward way to get to grips with what is actually going on in this regard would be to compare incidence of trisomy 21 oocytes (and their pairing configurations) in foetal ovaries with that in oocytes at the meiosis I stage from adult women.

  • 27.
    A. M. Naiini, Maziar
    KTH, School of Information and Communication Technology (ICT), Integrated Devices and Circuits.
    Horizontal Slot Waveguides for Silicon Photonics Back-End Integration2014Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    This thesis presents the development of integrated silicon photonic devices. These devices are compatible with the present and near future CMOS technology. High-khorizontal grating couplers and waveguides are proposed. This work consists of simulations and device design, as well as the layout for the fabrication process, device fabrication, process development, characterization instrument development and electro-optical characterizations.

    The work demonstrates an alternative solution to costly silicon-on-insulator photonics. The proposed solution uses bulk silicon wafers and thin film deposited waveguides. Back-end deposited horizontal slot grating couplers and waveguides are realized by multi-layers of amorphous silicon and high-k materials.

    The achievements of this work include: A theoretical study of fully etched slot grating couplers with Al2O3, HfO2 and AIN, an optical study of the high-k films with spectroscopic ellipsometry, an experimental demonstration of fully etched SiO2 single slot grating couplers and double slot Al2O3 grating couplers, a practical demonstration of horizontal double slot high-k waveguides, partially etched Al2O3 single slot grating couplers, a study of a scheme for integration of the double slot Al2O3  waveguides with selectively grown germanium PIN photodetectors, realization of test chips for the integrated germanium photodetectors, and study of integration with graphene photodetectors through embedding the graphene into a high-k slot layer.

    From an application point of view, these high-k slot waveguides add more functionality to the current silicon photonics. The presented devices can be used for low cost photonics applications. Also alternative optical materials can be used in the context of this photonics platform.

    With the robust design, the grating couplers result in improved yield and a more cost effective solution is realized for integration of the waveguides with the germanium and graphene photodetectors.

     

     

     

     

  • 28. A. Madsen, Kevin
    et al.
    J. Bergholtz, Emil
    Stockholm University, Faculty of Science, Department of Physics.
    Brouwer, Piet W.
    Josephson effect in a Weyl SNS junction2017In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 95, no 6, article id 064511Article in journal (Refereed)
    Abstract [en]

    We calculate the Josephson current density j (phi) for a Weyl superconductor-normal-metal-superconductor junction for which the outer terminals are superconducting Weylmetals and the normal layer is a Weyl (semi) metal. We describe the Weyl (semi) metal using a simple model with two Weyl points. The model has broken time-reversal symmetry, but inversion symmetry is present. We calculate the Josephson current for both zero and finite temperature for the two pairing mechanisms inside the superconductors that have been proposed in the literature, zero-momentum BCS-like pairing and finite-momentum FFLO-like pairing, and assuming the short-junction limit. For both pairing types we find that the current is proportional to the normal-state junction conductivity, with a proportionality coefficient that shows quantitative differences between the two pairing mechanisms. The current for the BCS-like pairing is found to be independent of the chemical potential, whereas the current for the FFLO-like pairing is not.

  • 29.
    A. Manneh, Ilana
    Stockholm University, Faculty of Science, Department of Mathematics and Science Education.
    Supporting Learning and Teaching of Chemistry in the Undergraduate Classroom2019Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    There is agreement in research about the need to find better ways of teaching chemistry to enhance students’ understanding. This thesis aims to contribute to the understanding of how we better support teaching and learning of undergraduate chemistry to make it meaningful and intelligible for students from the outset. The thesis is concerned with examining the interactions between student, specific content and teacher in the undergraduate chemistry classroom; that is, the processes making up the three relations of the didactic triangle. The data consists of observations of students and tutors during problem-solving activities in an introductory chemistry course and interviews with graduate students.

    Systematic analyses of the different interactions between the student, the chemistry content, and the tutor are made using the analytical tool of practical epistemology analysis. The main findings of the thesis include detailed insights into how undergraduate chemistry students deal with newly encountered content together with didactic models and concrete suggestions for improved teaching and for supporting continuity and progression in the undergraduate chemistry classroom. Specifically, I show how students deal with the chemistry content through a complex interaction of knowledge, experiences, and purposes on different levels invoked by both students and tutors as they interact with each other. Whether these interactions have a positive or negative effect on students’ learning depends on the nature of knowledge, experiences and purposes that were invoked. Moreover, the tutor sometimes invoked other purposes than the ones related to the task at hand for connecting the activity to the subject matter in general. These purposes were not always made continuous with the activity which resulting in confusion among students. The results from these analyses were used for producing hypotheses and models that could support continuity and progression during the activity. The suggested models aim to make the content more manageable and meaningful to students, enabling connections to other experiences and purposes, and helping teachers and tutors to analyze and reflect on their teaching. Moreover, a purpose- and activity-based progression is suggested that gives attention to purposes in chemistry education other than providing explanations of chemical phenomena. The aim of this ‘progression in action’ is to engage students in activities were they can see the meaning of chemical concepts and ideas through their use to accomplish different chemical tasks. A general conclusion is that detailed knowledge about the processes of teaching and learning is important for providing adequate support to both undergraduate students and university teachers in the chemistry classroom.

  • 30.
    A. Manneh, Ilana
    et al.
    Stockholm University, Faculty of Science, Department of Mathematics and Science Education.
    Hamza, Karim M.
    Stockholm University, Faculty of Science, Department of Mathematics and Science Education.
    Rundgren, Carl-Johan
    Stockholm University, Faculty of Science, Department of Mathematics and Science Education.
    Eriksson, Lars
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
    Progression in action for developing chemical knowledgeManuscript (preprint) (Other academic)
    Abstract [en]

    In this paper, we discuss the well-known teaching challenge of how to provide undergraduate students with basic chemistry knowledge without making them experience these basics as meaningless and unintelligible. First, we situate the challenge in a classic dilemma: should we teach the necessary basic facts before the chemical explanations or should the explanations be taught before or in parallel to these facts? Here we draw on examples from interviews with graduate students reflecting on their experiences regarding their studies at the undergraduate level. Second, we suggest a way out of the dilemma, through a shift in perspective from the typical progression of facts and explanations towards a purpose and activity-based progression. We conclude with a discussion of implications of such a shift for university chemistry education together with suggestions for future research.

  • 31.
    A. Manneh, Ilana
    et al.
    Stockholm University, Faculty of Science, Department of Mathematics and Science Education.
    Hamza, Karim
    Stockholm University, Faculty of Science, Department of Mathematics and Science Education.
    Rundgren, Carl-Johan
    Stockholm University, Faculty of Science, Department of Mathematics and Science Education.
    Eriksson, Lars
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
    The role of anthropomorphisms in students’ reasoning about chemical structure and bonding2018In: Asia-Pacific Forum on Science Learning and Teaching, ISSN 1609-4913, E-ISSN 1609-4913, Vol. 19, no 2, article id 4Article in journal (Refereed)
    Abstract [en]

    Anthropomorphisms are widespread at all levels of the educational system even among science experts. This has led to a shift in how anthropomorphisms are viewed in science education, from a discussion of whether they should be allowed or avoided towards an interest in their role in supporting students’ understanding of science. In this study we examine the role of anthropomorphisms in supporting students’ understanding of chemistry. We analyze examples from undergraduate students’ discussions during problem-solving classes through the use of practical epistemology analysis (PEA). Findings suggest that students invoked anthropomorphisms alongside technical relations which together produced more or less chemically appropriate explanations. Also, anthropomorphisms constitute potentially productive points of departure for rendering students’ explanations more chemically appropriate. The implications of this study refer to the need to deal with anthropomorphisms explicitly and repeatedly as well as to encourage explicit connections between different parts of the explanation - teleological as well as causal.

  • 32.
    A. Manneh, Ilana
    et al.
    Stockholm University, Faculty of Science, Department of Mathematics and Science Education.
    Rundgren, Carl-Johan
    Stockholm University, Faculty of Science, Department of Mathematics and Science Education.
    Hamza, Karim M.
    Stockholm University, Faculty of Science, Department of Mathematics and Science Education.
    Eriksson, Lars
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
    Tutor-student interaction in undergraduate chemistry: a case of learning to make relevant distinctions of molecular structures for determining oxidation states of atoms2018In: International Journal of Science Education, ISSN 0950-0693, E-ISSN 1464-5289, Vol. 40, no 16, p. 2023-2043Article in journal (Refereed)
    Abstract [en]

    In this study, we explore the issues and challenges involved in supporting students’ learning to discern relevant and critical aspects of determining oxidation states of atoms in complex molecules. We present a detailed case of an interaction between three students and a tutor during a problem-solving class, using the analytical tool of practical epistemology analysis (PEA). The results show that the ability to make relevant distinctions between the different parts of a molecule for solving the problem, even with the guidance of the tutor, seemed to be challenging for students. These shifts were connected to both purposes that were specific for solving the problem at hand, and additional purposes for general learning of the subject matter, in this case how to assign oxidation states in molecules. The students sometimes could not follow the additional purposes introduced by the tutor, which made the related distinctions more confusing. Our results indicate that in order to provide adequate support and guidance for students the tutor needs to consider how to sequence, move between, and productively connect the different purposes introduced in a tutor-student interaction. One way of doing that is by first pursuing the purposes for solving the problem and then successively introduce additional, more general purposes for developing students’ learning of the subject matter studied. Further recommendations drawn from this study are discussed as well.

  • 33. A Molarius, A
    et al.
    Granström, F
    Feldman, Inna
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Women's and Children's Health.
    Kalander Blomqvist, M
    Pettersson, H
    Ello, S
    Can financial insecurity and condescending treatment explain the higher prevalence of poor self-rated health in women than in men? A population-based cross-sectional study in Sweden2012Conference paper (Other academic)
  • 34.
    A Monfared, Behzad
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Design and Construction of a Small Ammonia Heat Pump2010Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In view of the fact that most of the synthetic refrigerants, in case of leakage or release, are harmful to the environment by contributing in global warming or depleting stratospheric ozone layer, many research works have been done recently to find alternative refrigerants posing no or negligible threat to the environment. Among alternative refrigerants, ammonia, a natural refrigerant with zero Global Warming Potential (GWP) and Ozone Depletion Potential (ODP), can be a sensible choice.Although ammonia has been used for many years in large industrial systems, its application in small units is rare. In this project a small heat pump with about 7 kW heating capacity at -5 °C and +40 °C evaporation and condensation temperatures is designed and built to work with ammonia as refrigerant. The heat pump is expected to produce enough heat to keep a single-family house warm in Sweden and to provide tap hot water for the house. After successful completion of this project, it is planned to install the heat pump in a house to test it throughout a heating season to study its performance in real working conditions.Since ammonia is flammable and toxic in high concentrations, the refrigerant charge is tried to be kept low in the heat pump to reduce the risk of fire or poisoning in case of unwanted release of refrigerant to the surroundings. The compact design of the heat pump helps reducing the refrigerant charge. Besides, considering the limited space normally reserved for installation of a heat pump in a house, the compact design of the heat pump is necessary.

  • 35.
    A Monfared, Behzad
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Magnetic Refrigeration for Near Room-Temperature Applications2018Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Refrigeration plays a crucial role in many different sectors and consumes about 17% of the electricity produced globally. This significant energy consumption implies large share of refrigeration in primary energy consumption and other environmental impacts. In addition to the environmental impacts associated with energy consumption, the vapor-compression systems contribute in global warming due to the release of their gaseous refrigerants into the atmosphere. As an alternative technology for near room-temperature applications, magnetic refrigeration is proposed by some researchers to eliminate the release of gaseous refrigerants into the atmosphere and to reduce the energy consumption. This thesis is a compilation of a number of studies done on magnetic refrigeration for room-temperature applications.

    In the first study, the environmental impacts associated to magnetic refrigeration are looked at closely through a life cycle assessment. The life cycle assessment indicates that because of the environmental burdens related to the rare-earth materials used in magnetic refrigeration, the reduction in the environmental impacts is not guaranteed by switching to magnetic refrigeration technology. Accordingly to avoid the extra environmental impacts the magnetic refrigeration systems should use magnetic materials frugally, which requires an optimized design. In addition, operation with higher efficiency compared to vapor-compression systems is necessary to have environmental advantages, at least in some impact categories.

    A practical method to optimize the design of magnetic refrigeration systems, e.g. to have a compact design or high efficiency, is utilizing a flexible software model, with which the effect of varying different parameters on the performance of the system can be simulated. Such a software model of the magnetic refrigeration system is developed and validated in this project. In developing the model one goal is to add to the precision of the simulated results by taking more details into consideration. This goal is achieved by an innovative way of modeling the parasitic heat transfer and including the effect of the presence of magnetocaloric materials on the strength of the field created by the magnet assembly. In addition, some efforts are made to modify or correct the existing correlations to include the effect of binding agents used in some active magnetic regenerators. Validation of the developed software model is done using the experimental results obtained from the prototype existing at the Department of Energy Technology, KTH Royal Institute of Technology.

    One of the parameters that can be modified by the developed software model is the choice of the magnetocaloric materials for each layer in a layered active magnetic regenerator. Utilizing the software model for optimizing the choice of the materials for the layers reveals that materials with critical temperatures equal to the cyclic average temperature of the layers in which they are used do not necessarily result in the desired optimum performance. In addition, for maximizing different outputs of the models, such as energy efficiency or temperature lift sustained at the two ends of the regenerators, different choice of materials for the layers are needed. Therefore, in other studies seeking to improve one of the outputs of a system, the choice of the transition or critical temperatures of the materials for each layer is an additional parameter to be optimized.

    The prototype existing at the Department of Energy Technology, KTH Royal Institute of Technology, was initially designed for replacing the vapor-compression system of a professional refrigerator. However, it could not fulfil the requirements for which it was initially designed. The aforementioned developed simulation model is used to see how much the choice of the materials, size of the particles, and number of layers can enhance the performance while the operation frequency and flow rate of the heat transfer fluid are at their optimum values. In other words, in that study the room for improvement in the performance without applying major changes in the system such as the geometry of the regenerator, which implies redesigning the whole magnet assembly, is investigated. In the redesign process the effect of binding agent and the limitations associated to different properties of it is also investigated theoretically. Nevertheless, the study did not show that with keeping the geometry of the regenerators and the currently existing magnetocaloric materials the initial goals of the prototype can be achieved.

    In the next study more flexible choice of geometries and magnetocaloric materials are considered. In fact, in this study it is investigated how much the magnetocaloric materials need to be improved so that magnetic refrigeration systems can compete with vapor-compression ones in terms of performance. For the two investigated cases, the magnetic-field dependent properties of the currently existing materials are enough provided that some other issues such as low mechanical stability and inhomogeneity of the properties are solved. Nevertheless, for more demanding design criteria, such as delivering large cooling capacity over a considerable temperature span while the magnetic materials are used sparingly, the magnetic-field dependent properties need to be enhanced, as well.

    A less explored area in room-temperature magnetic refrigeration is the subject of another study included in the thesis. In this study, solid-state magnetic refrigeration systems with Peltier elements as heat switches are modeled. Since the Peltier elements consume electricity to pump heat, the modeled systems can be considered hybrid magnetocaloric-Peltier cooling systems. For such systems the detailed transient behavior of the Peltier elements together with layers of magnetocaloric materials are modeled. The mathematical model is suitable for implementation in programing languages without the need for commercial modeling platforms. The parameters affecting the performance of the modeled system are numerous, and optimization of them requires a separate study. However, the preliminary attempts on optimizing the modeled system does not give promising results. Accordingly, focusing on passive heat switches can be more beneficial.

  • 36.
    A. Proko, Romina
    Örebro University, School of Medical Sciences.
    Deskriptiv studie av Multimodal Rehabilitering 1-deltagare i västra Region Örebro Län: - förändring i självskattning av ångest/depression och basal kroppskännedom efter åtta veckors intervention2019Independent thesis Basic level (degree of Bachelor of Fine Arts), 10 credits / 15 HE creditsStudent thesis
  • 37.
    A. Sani, Negar
    Linköping University, Department of Science and Technology, Physics and Electronics.
    M-PSK and M-QAM Modulation/Demodulation of UWB Signal Using Six-Port Correlator2010Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Nowadays high speed and high data rate communication are highly demanded. Consequently, wideband and high frequency transmitter and receivers should be designed. New transmitters and receivers should also have low power consumption, simple design and low manufacturing price in order to fulfill manufacturers’ requests for mass production. Having all above specifications, six-port correlator is a proper choice to be used as modulator and demodulator in transmitters and receivers.

    In this thesis the six-port correlator is introduced, modeled and simulated using Advanced Design System (ADS) software. A simple six-port transmitter/receiver system with a line of sight link is modeled and analyzed in BER, path length and noise terms. The modulation in this system is QAM, frequency is 7.5 GHz and symbol rate is 500 Msymbol/s.

    Furthermore two methods are proposed for high frequency and high symbol rate M-PSK and M-QAM modulation using six-port correlator. The 7.5 GHz modulators are modeled and simulated in ADS. Data streams generated by pseudo random bit generator with 1 GHz bandwidth are applied to modulators. Common source field effect transistors (FETs) with zero bias are used as controllable impedance termination to apply baseband data to modulator. Both modulators show good performance in M-PSK and M-QAM modulation.

  • 38.
    A. Strumpfer, Johan
    et al.
    University of Illinois at Urbana Champaign, Urbana, IL, USA; Beckman Institute, Urbana, IL, USA.
    von Castelmur, Eleonore
    Institute of Integrative Biology, University of Liverpool, Liverpool, IL, USA.
    Franke, Barbara
    Institute of Integrative Biology, University of Liverpool, Liverpool, United Kingdom.
    Barbieri, Sonia
    Institute of Integrative Biology, University of Liverpool, Liverpool, United Kingdom.
    Bogomolovas, Julijus
    Universitätsmedizin Mannheim, Mannheim, Germany.
    Qadota, Hiroshi
    Department of Pathology, Emory University, Atlanta, GA, USA.
    Konarv, Petr
    European Molecular Biology Laboratory, Hamburg, Germany.
    Svergun, Dmitri
    European Molecular Biology Laboratory, Hamburg, Germany.
    Labeit, Siegfried
    Department for Integrative Pathophysiology, Universitätsmedizin Mannheim, Mannheim, Germany.
    Schulten, Klaus
    University of Illinois at Urbana Champaign, Urbana, IL, USA Beckman Institute, Urbana, IL, USA.
    Benian, Guy
    Department of Pathology, Emory University, Atlanta, GA, USA.
    Mayans, Olga
    Institute of Integrative Biology, University of Liverpool, Liverpool, United Kingdom.
    Stretching of Twitchin Kinase2012In: Biophysical Journal, ISSN 0006-3495, E-ISSN 1542-0086, Vol. 102, no 3 Supplement 1, p. 361a-362aArticle in journal (Refereed)
    Abstract [en]

    The giant proteins from the titin family, that form cytoskeletal filaments, have emerged as key mechanotransducers in the sarcomere. These proteins contain a conserved kinase region, which is auto-inhibited by a C-terminal tail domain. The inhibitory tail domain occludes the active sites of the kinases, thus preventing ATP from binding. It was proposed that through application of a force, such as that arising during muscle contraction, the inhibitory tail becomes detached, lifting inhibition. The force-sensing ability of titin kinase was demonstrated in AFM experiments and simulations [Puchner, et al., 2008, PNAS:105, 13385], which showed indeed that mechanical forces can remove the autoinhibitory tail of titin kinase. We report here steered molecular dynamics simulations (SMD) of the very recently resolved crystal structure of twitchin kinase, containing the kinase region and flanking fibronectin and immuniglobulin domains, that show a variant mechanism. Despite the significant structural and sequence similarity to titin kinase, the autoinhibitory tail of twitchin kinase remains in place upon stretching, while the N-terminal lobe of the kinase unfolds. The SMD simulations also show that the detachment and stretching of the linker between fibronectin and kinase regions, and the partial extension of the autoinhibitory tail, are the primary force-response. We postulate that this stretched state, where all structural elements are still intact, may represent the physiologically active state.

  • 39.
    A. Taher, Ali
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology.
    BIM Software Capability and Interoperability Analysis: An analytical approach toward structural usage of BIM software (S-BIM)2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This study focused on the structuralanalysis of BIM models. Different commercial software (Autodesk products and Rhinoceros)are presented through modelling and analysis of different structures with varying complexity,section properties, geometry, and material. Beside the commercial software, differentarchitectural and different tools for structural analysis are evaluated (dynamo, grasshopper,add-on tool, direct link, indirect link via IFC).

  • 40. A. Taleghani, Pouria
    Laboratory Test on Thermal Spalling and Cracking Around Cylindrical Opening in Rock under Bi-axial Loading Condition2013Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    A series of laboratory scale studies has been conducted to assess the thermal response of common rock types in Fennoscandinavia. The main objective of this experiment was to investigate experimentally the effect of initial compressive stress on thermal spalling and determine the mechanism causing thermal damage (spalling and fracturing) in rock observed in laboratory experiments. Seven tests were carried out including oven-dried and water-stored rock blocks, with and without applying bi-axial stress on three rock types, granite, gabbro and schist.

  • 41. A. Viggiano, A
    et al.
    M. Midey and A. Ehlerding, A
    Kinetics of the reactions of ONOO- with small molecules2006In: International journal of mass spectrometry, Vol. 255, p. 65-Article in journal (Refereed)
  • 42.
    A. Wójcik, Natalia
    et al.
    Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology. Department of Solid State Physics, Faculty of Applied Physics and Mathematics, Gdańsk University of Technology, Narutowicza Street 11/12, 80–233 Gdańsk, Poland.
    Ali, Sharafat
    Linnaeus University, Faculty of Technology, Department of Building and Energy Technology.
    Möncke, Doris
    Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology. Inamori School of Engineering at the New York State College of Ceramics, Alfred University, 1 Saxon Drive, Alfred, 14802 New York, USA.
    Kamitsos, Efstratios
    Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, 11635 Athens, Greece.
    Segawa, Hiroyo
    Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology. National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan.
    Eriksson, Mirva
    Department of Inorganic Chemistry, Arrhenius Laboratory, Stockholm University, S-106 91 Stockholm, Sweden.
    Jonson, Bo
    Linnaeus University, Faculty of Technology, Department of Building and Energy Technology.
    The influence of Be addition on the structure and thermal properties of alkali-silicate glasses2019In: Journal of Non-Crystalline Solids, ISSN https://doi.org/10.1016/j.jnoncrysol.2019.119532, Vol. 521, p. 1-10, article id 119532Article in journal (Refereed)
    Abstract [en]

    Be-Na-(Li)-Si oxide glasses containing up to 15 mol% of BeO were prepared. Their structure was characterized by X-ray powder diffraction and Raman as well as infrared spectroscopic techniques, while their chemical compositions were examined by Inductively Coupled Plasma Optical Emission Spectrometry. All materials were found to be amorphous and contain Al contaminations from minor dissolution of the alumina crucibles. The results of Raman and IR spectroscopies showed that BeO addition to Na-(Li)-Si glass systems resulted in the formation of [BeO4/2]2− tetrahedra which are inserted into the silicate glass network, demonstrating the intermediate glass-forming role of BeO. In parallel, the effective destruction of Si-O-Si bridges was observed by vibrational spectroscopy. The glass transition temperature was studied by Differential Thermal Analysis and found to range from about 431 °C to 551 °C. A significant increase in Tg by 70 °C was found as SiO2 was substituted by up to 15 mol% BeO.

  • 43.
    A. Zheltukhin, A
    Stockholm University, Faculty of Science, Department of Physics.
    Unification of twistors and Ramond vectors2007In: Physics letters B, Vol. 658, p. 82-Article in journal (Refereed)
  • 44.
    A Österman, Sami
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering.
    Kumar, Shirish
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering.
    Vattenskärning: Teknologin och dess tillämpningsområden2010Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Water jet cutting is generally considered to be a versatile processing technique with a variety of applications. Pure water jet cutting makes it possible to cut through soft materials like rubber, while an added abrasive allows cutting of including steel and ceramics. The cut leaves neither any residual stress nor heat stress in the material. In addition, the surface finish is often of high enough quality, making post treatment unnecessary. The process does not yield in any dangerous gases and is relatively environmentally friendly. The purpose of this thesis was to investigate the water jet technology, its current, as well as new application areas. The goal was also to compare the technique with alternative processing methods in order to clarify the advantages and disadvantages between them. This was done in order to investigate which technologies are most appropriate to use depending on properties such as material, material thickness and size of the produced series. This paper has been written together from Sweden and France and a choice was hence made to investigate if the uses of water jet cutting differ between the two countries. To meet the objective, three questions were used to investigate how to expand the application areas of water jet cutting, what advantages and disadvantages there are between water jet cutting and other processing methods and how the scope of its applications differs between France and Sweden. The main sources of information for the work have been interviews with manufacturing companies that use water jet cutting, suppliers of water jet cutting machines and research institutes. Research articles have been used in order to extend the range of gathered information. Among primary sources for this report were websites of companies in the processing industry. This thesis shows that water jet technology is applicable in many industries and application areas that differ between France and Sweden, in France, used water jets are mainly used in the food industry, while it is more widespread in the engineering industry in Sweden. Companies in the Swedish market are skeptical about the use of water jet cutters exceeding 400 MPa, although it suggests many advantages. The main limitation of the water jet cutting procedure is the thickness of the material. Cutting steel beyond 30 mm in thickness, can result in a stream lag by delaying the water jet and thereby induce non‐precise cutting. This problem may be solved by changing the cutting parameters such as cutting speed or by inclining the cutting nozzle. Following an evaluation of plasma, laser and water jet cutters, none of the methods is directly competing with one another, since each single cutting technique is best suited for their intended use. The techniques complement each other rather than competing with one another.

  • 45.
    Aabel, Peder
    et al.
    Oslo Univ Hosp, Dept Med Biochem, Oslo, Norway;Akershus Univ Hosp, Ear Nose & Throat Dept, Div Surg, Lorenskog, Norway;Univ Oslo, Inst Clin Med, Div Surg, Oslo, Norway.
    Utheim, Tor Paaske
    Oslo Univ Hosp, Dept Med Biochem, Oslo, Norway;Univ Oslo, Inst Oral Biol, Fac Dent, Oslo, Norway.
    Olstad, Ole Kristoffer
    Oslo Univ Hosp, Dept Med Biochem, Oslo, Norway.
    Rask-Andersen, Helge
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Surgical Sciences, Otolaryngology and Head and Neck Surgery.
    Dilley, Rodney James
    Ear Sci Inst Australia, Perth, WA, Australia;Univ Western Australia, Ear Sci Ctr, Nedlands, WA, Australia;Univ Western Australia, Ctr Cell Therapy & Regenerat Med, Nedlands, WA, Australia.
    von Unge, Magnus
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Medicinska och farmaceutiska vetenskapsområdet, centrumbildningar mm, Centre for Clinical Research, County of Västmanland. Akershus Univ Hosp, Ear Nose & Throat Dept, Div Surg, Lorenskog, Norway;Univ Oslo, Inst Clin Med, Div Surg, Oslo, Norway.
    Transcription and microRNA Profiling of Cultured Human Tympanic Membrane Epidermal Keratinocytes2018In: Journal of the Association for Research in Otolaryngology, ISSN 1525-3961, E-ISSN 1438-7573, Vol. 19, no 3, p. 243-260Article in journal (Refereed)
    Abstract [en]

    The human tympanic membrane (TM) has a thin outer epidermal layer which plays an important role in TM homeostasis and ear health. The specialised cells of the TM epidermis have a different physiology compared to normal skin epidermal keratinocytes, displaying a dynamic and constitutive migration that maintains a clear TM surface and assists in regeneration. Here, we characterise and compare molecular phenotypes in keratinocyte cultures from TM and normal skin. TM keratinocytes were isolated by enzymatic digestion and cultured in vitro. We compared global mRNA and microRNA expression of the cultured cells with that of human epidermal keratinocyte cultures. Genes with either relatively higher or lower expression were analysed further using the biostatistical tools g:Profiler and Ingenuity Pathway Analysis. Approximately 500 genes were found differentially expressed. Gene ontology enrichment and Ingenuity analyses identified cellular migration and closely related biological processes to be the most significant functions of the genes highly expressed in the TM keratinocytes. The genes of low expression showed a marked difference in homeobox (HOX) genes of clusters A and C, giving the TM keratinocytes a strikingly low HOX gene expression profile. An in vitro scratch wound assay showed a more individualised cell movement in cells from the tympanic membrane than normal epidermal keratinocytes. We identified 10 microRNAs with differential expression, several of which can also be linked to regulation of cell migration and expression of HOX genes. Our data provides clues to understanding the specific physiological properties of TM keratinocytes, including candidate genes for constitutive migration, and may thus help focus further research.

  • 46.
    Aaberg, Alma
    et al.
    University of Borås, Faculty of Caring Science, Work Life and Social Welfare.
    Olsson Piittisjärvi, Patricia
    University of Borås, Faculty of Caring Science, Work Life and Social Welfare.
    Nyutexaminerade sjuksköterskors upplevelser av kliniskt introduktionsår: En litteraturstudie2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Ett påtagligt samhällsproblem idag är den rådande brist på legitimerade sjuksköterskor som arbetar inom den svenska sjukvården. I takt med att befolkningen ökar och medelåldern blir allt högre blir vikten av att bibehålla verksamma legitimerade sjuksköterskor allt mer påtaglig. Att komma ut i verksamheten som nyutbildad sjuksköterska kan upplevas som en stor utmaning och första tiden i yrket kan ses som en intensiv och krävande process. För att underlätta transitionen från student till yrkesverksam sjuksköterska har ett introduktionsprogram utformats i syfte att vägleda och stödja de nyblivna sjuksköterskorna.

    Författarnas syfte med studien är att beskriva nyutexaminerade sjuksköterskors upplevelser av ett kliniskt introduktionsår. Examensarbetet grundar sig i en litteraturstudie som utgår från Fribergs analysprocess där tio artiklar granskas och analyseras. Analysen resulterar i fyra identifierade huvudteman med tillhörande tretton subteman som tillsammans sammanfattar upplevelser av kliniskt introduktionsår som nyutexaminerad sjuksköterska. Identifierade huvudteman i arbetet är: ”Möjligheten till att få växa personligt och professionellt”, ”Att vara i rum för reflektion”, ”Att existera i en kravfylld tillvaro” samt ”Vikten av att ha kollegialt stöd inom räckhåll”. Resultatet påvisar flera fördelar med deltagandet i kliniskt introduktionsprogram men även vissa brister identifieras. Resultatet påvisar att upplevelser av krav under övergångsprocessen är återkommande hos de flesta nyutexaminerade sjuksköterskorna som genomgår kliniskt introduktionsår. För att underlätta övergångsprocessen är faktorer så som en stödjande miljö, tillhörighet i personalgruppen och reflektion som verktyg viktiga komponenter. Författarna anser att vidare fördjupning kring upplevelser av ett introduktionsprogram och hur detta introduktionsprogram erfars ur ett sjuksköterskeperspektiv är av stor vikt i syfte att möta sjuksköterskans behov under det första yrkesverksamma året.

  • 47. Aaberg, Jenny B.
    et al.
    Samec, Joseph S. M.
    Baeckvall, Jan-E.
    Mechanistic investigation on the hydrogenation of imines by [p-(Me2CH)C6H4Me]RuH(NH2CHPhCHPhNSO2C6H4-p-CH3). Experimental support for an ionic pathway.2006In: Chemical Communications, ISSN 1359-7345, E-ISSN 1364-548X, no 26, p. 2771-2773Article in journal (Refereed)
    Abstract [en]

    The need for acidic activation in the stoichiometric hydrogenation of benzyl-[1-phenyl-ethylidene]-amine (6a) or [1-(4-methoxy-phenyl)-ethylidene]-methyl-amine (6b) by Noyori's catalyst [p-(Me2CH)C6H4Me]RuH(NH2CHPhCHPhNSO2C6H4-p-CH3) (2) is inconsistent with the proposed concerted mechanism and supports an ionic mechanism. [on SciFinder(R)]

  • 48.
    Aaberg, Oddveig Reiersdal
    et al.
    Norwegian Univ Sci & Technol, Fac Med & Hlth Sci, Dept Hlth Sci, Gjovik, Norway.
    Hall-Lord, Marie Louise
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Health Sciences (from 2013). Norwegian Univ Sci & Technol, Fac Med & Hlth Sci, Dept Hlth Sci, Gjovik, Norway.
    Husebo, Sissel Iren Eikeland
    Univ Stavanger, Fac Hlth Sci, Dept Qual & Hlth Technol, Stavanger, Norway.
    Ballangrud, Randi
    Norwegian Univ Sci & Technol, Fac Med & Hlth Sci, Dept Hlth Sci, Gjovik, Norway.
    Collaboration and Satisfaction About Care Decisions in Team questionnaire: Psychometric testing of the Norwegian version, and hospital healthcare personnel perceptions across hospital units2019In: Nursing Open, E-ISSN 2054-1058, Vol. 6, no 2, p. 642-650Article in journal (Refereed)
    Abstract [en]

    Aim To translate "The Collaboration and Satisfaction About Care Decisions in Team" questionnaire (CSACD-T) into Norwegian and test it for psychometric properties. The further aim was to describe and compare healthcare personnel's collaboration and satisfaction about team decision-making (TDM) across hospital units. Design A cross-sectional study. Methods The questionnaire was translated into Norwegian. A total of 247 healthcare personnel at two hospitals responded to the questionnaire. An explorative factor analysis was performed to test the factor structure of the questionnaire, while a Cronbach's alpha analysis was used to test for internal consistency. A one-way ANOVA analysis and a Kruskal-Wallis test were applied to test for differences between hospital units. Results The results demonstrate that the Norwegian version of the CSACD-T has promising psychometric properties regarding construct validity and internal consistency. The mean score of the CSACD-T was significantly higher in the maternity ward group than in the emergency room group.

  • 49. Aaberge, Rolf
    et al.
    Bourguignon, François
    Brandolini, Andrea
    Ferreira, Francisco H. G.
    Gornick, Janet G.
    Hills, John
    Jäntti, Markus
    Stockholm University, Faculty of Social Sciences, The Swedish Institute for Social Research (SOFI).
    Jenkins, Stephen P.
    Marlier, Eric
    Micklewright, John
    Nolan, Brian
    Piketty, Thomas
    Radermacher, Walter J.
    Smeeding, Timothy M.
    Stern, Nicholas H.
    Stiglitz, Joseph
    Sutherland, Holly
    Tony Atkinson and his Legacy2017In: The Review of Income and Wealth, ISSN 0034-6586, E-ISSN 1475-4991, Vol. 63, no 3, p. 411-444Article in journal (Refereed)
    Abstract [en]

    Tony Atkinson is universally celebrated for his outstanding contributions to the measurement and analysis of inequality, but he never saw the study of inequality as a separate branch of economics. He was an economist in the classical sense, rejecting any sub-field labelling of his interests and expertise, and he made contributions right across economics. His death on 1 January 2017 deprived the world of both an intellectual giant and a deeply committed public servant in the broadest sense of the term. This collective tribute highlights the range, depth and importance of Tony's enormous legacy, the product of almost fifty years’ work.

  • 50. Aabloo, A
    et al.
    Klintenberg, M
    Thomas, John Oswald
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    Molecular dynamics simulation of a polymer-inorganic interface.2000In: Electrochim.Acta, Vol. 45, p. 1425-Article in journal (Refereed)
1234567 1 - 50 of 1192258
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