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  • Gustafsson, Emil (författare)
  • Design and application of experimental methods for steel sheet shearing
  • 2016
  • Doktorsavhandling (övrigt vetenskapligt)abstract
    • <p>Shearing is the process where sheet metal is mechanically cut between two tools. Various shearing technologies are commonly used in the sheet metal industry, for example, in cut to length lines, slitting lines, end cropping etc. Shearing has speed and cost advantages over competing cutting methods like laser and plasma cutting, but involves large forces on the equipment and large strains in the sheet material. The constant development of sheet metals toward higher strength and formability leads to increased forces on the shearing equipment and tools.</p><p>Shearing of new sheet materials imply new suitable shearing parameters. Investigations of the shearing parameters through live tests in the production are expensive and separate experiments are time consuming and requires specialized equipment. Studies involving a large number of parameters and coupled effects are therefore preferably performed by finite element based simulations. Accurate experimental data is still a prerequisite to validate such simulations. There is, however, a shortage of accurate experimental data to validate such simulations.</p><p>In industrial shearing processes, measured forces are always larger than the actual forces acting on the sheet, due to friction losses. Shearing also generates a force that attempts to separate the two tools with changed shearing conditions through increased clearance between the tools as result. Tool clearance is also the most common shearing parameter to adjust, depending on material grade and sheet thickness, to moderate the required force and to control the final sheared edge geometry.</p><p>In this work, an experimental procedure that provides a stable tool clearance together with accurate measurements of tool forces and tool displacements, was designed, built and evaluated. Important shearing parameters and demands on the experimental set-up were identified in a sensitivity analysis performed with finite element simulations under the assumption of plane strain. With respect to large tool clearance stability and accurate force measurements, a symmetric experiment with two simultaneous shears and internal balancing of forces attempting to separate the tools was constructed.</p><p>Steel sheets of different strength levels were sheared using the above mentioned experimental set-up, with various tool clearances, sheet clamping and rake angles. Results showed that tool penetration before fracture decreased with increased material strength. When one side of the sheet was left unclamped and free to move, the required shearing force decreased but instead the force attempting to separate the two tools increased. Further, the maximum shearing force decreased and the rollover increased with increased tool clearance.</p><p>Digital image correlation was applied to measure strains on the sheet surface. The obtained strain fields, together with a material model, were used to compute the stress state in the sheet. A comparison, up to crack initiation, of these experimental results with corresponding results from finite element simulations in three dimensions and at a plane strain approximation showed that effective strains on the surface are representative also for the bulk material.</p><p>A simple model was successfully applied to calculate the tool forces in shearing with angled tools from forces measured with parallel tools. These results suggest that, with respect to tool forces, a plane strain approximation is valid also at angled tools, at least for small rake angles.</p><p>In general terms, this study provide a stable symmetric experimental set-up with internal balancing of lateral forces, for accurate measurements of tool forces, tool displacements, and sheet deformations, to study the effects of important shearing parameters. The results give further insight to the strain and stress conditions at crack initiation during shearing, and can also be used to validate models of the shearing process.</p>
  • Halila, Fawzi, 1958- (författare)
  • The adoption and diffusion of environmental innovations
  • 2007
  • Doktorsavhandling (övrigt vetenskapligt)abstract
    • <p>This thesis is an attempt to improve the understanding of the process of adoption and diffusion of environmental innovations. The thesis is based on two research projects. One project deals with the diffusion of environmental innovations and why they are less successful on the market than other innovations. The other project is about the adoption of environmental innovations by Small and Medium Sized Enterprises (SMEs) and how to facilitate the adoption process.There are at least two good reasons why we should support the adoption and diffusion of eco- innovations. One argument from an environmental point of view is that successfully managing the environment is the greatest challenge facing us in the future and the global scenarios for the next decades are not encouraging. Another argument, from an economic point of view, for the need of eco-innovations is that the eco-industry is one of the most growing industries in the world and is likely to be worth around $600 billion worldwide by 2010.However, there are some indications that environmental innovations have a difficult time in gaining success in the marketplace and in spreading among potential customers, possibly more difficulty than some other kinds of innovations have.The overall objective of this thesis is to generate knowledge regarding the adoption and diffusion of environmental innovations. One purpose is to add to our understanding of environmental innovations and to their similarities and differences to “other” innovations. Another purpose is to understand and describe how networks can be used to facilitate the adoption of environmental innovations. The main research questions that I try to answer are:1) How can environmental innovations be classified? 2) Are environmental innovations less successful on the market than other innovations? 3) What are the main reasons for the differences in market success between environmental innovations and other innovations? 4) How could networks be used as a development method to facilitate the adoption of environmental innovations by SMEs?Several different methodological approaches have been used to develop a broader picture of different types of innovations and their development, adoption and diffusion. Two different approaches were used during the first project, dealing with the diffusion and market success of environmental innovations. The first one is mainly based on using questionnaires. The other approach is qualitative and based on case studies. Through a series of case studies of innovators and innovations we tried to achieve a better picture of the actual phenomena.The second project is about the adoption of an organizational environmental innovation by SMEs using a network. Since the goal of this project has been not only to observe the phenomena of the implementation of environmental innovation by SMEs using a network, but also to contribute to the development process, an action-oriented research approach was used in this project.Three main conclusions can be drawn on the basis of this thesis. Firstly, the new innovation classification system developed in this thesis improves the possibilities for distinguishing between innovations that are similar but not identical. A very large proportion of the analyzed eco-innovations are often classified as product redesign innovations. With the help of the new classification system it is possible to discern different types among those classified as product re-Vdesign innovations. Some are rather simple and accordingly classified as product care innovations, while others are classified as minor or major product improvements or even functional innovations. Secondly, our empirical studies results show that the environmental innovations are less successful on the market than “other” innovations. The empirical studies also show that there are mainly three factors which are especially important to consider in the improvement of environmental innovations’ marketing success. These three are: “Realism while evaluating one’s own innovation”, “Access to capital” and “Utilization of network”.Thirdly, to adopt an environmental innovation is not an easy task for small organizations, such as SMEs. But to be a part of and use a network is a possible way to facilitate the adoption process.</p>
  • Holmquist, Mats, 1954- (författare)
  • Lärande nätverk En social oas i utvecklingsprocessen
  • 2010
  • Doktorsavhandling (övrigt vetenskapligt)abstract
    • <p>Intresset för nätverk mellan organisationer växer i arbetslivet. Fler och fler chefer, ledare och ansvariga går med i nätverk för att få stöd i sitt utvecklingsarbete. Varför? Vad är det för speciellt med lärande i nätverk? Vad får individen och organisationen ut? Mina egna och kollegors erfarenheter från tio års praktiskt arbete i fem nätverk i Halland, har gett mig en unik tillgång till data för att söka svar på frågorna.</p><p>Med hjälp av flervetenskaplig teori och tidigare empirisk forskning har jag skapat en modell över nätverk som stöd i utvecklingsprocessen. Modellen har jag använt till att analysera mina data för att förstå lärprocessen i nätverk, vilka förutsättningar och organiseringsformer som är viktiga för att stimulera det kollektiva lärande som uppstår i samverkan mellan olika individer och organisationer. Jag har även undersökt vad deltagandet ger i utbyte och vad som stödjer respektive hindrar en transformering till organisatorisk nytta och förändring.</p><p>Resultaten visar att nätverk fungerar som en social oas för chefer och ledare, som kan vara ganska ensamma och osäkra i sitt arbete. De uppskattar en plats där de kan möta andra i en liknande situation, för att under tillitsfulla former utbyta erfarenheter och reflektera över sina handlingsalternativ. Deltagarnas olikheter tillför variationer som stimulerar ett kreativt lärande och genererar innovativa idéer.</p><p>I stort sett alla deltagare är mycket positiva till nätverkformen. Utbytet är huvudsakligen personliga insikter och kunskaper i form av ökat självförtroende, reducerad osäkerhet och stärkt förändringskompetens. Deltagandet ger även inspiration, idéer och organisatoriska förändringsförslag. När dessa sedan ska föras över från nätverket till organisationen möter dock deltagarna ofta svårigheter och hinder.</p><p>Organisationernas förmåga att absorbera nätverksresultaten brister. De har många gånger svårt att ta tillvara nya kunskaper och idéer, att integrera nätverkslärande med organisatoriskt lärande och därmed svårt att utnyttja den utvecklingspotential som nätverk rymmer. Viktiga hinder är strategi- och förankringsbrist på ledningsnivån.</p><p>Nätverkets styrka som en stödjande social oas för deltagaren i utvecklingsprocessen rymmer också en svaghet. Utbytet riskerar att begränsas till personlig bekräftelse och bidra till få organisatoriska förändringar. För att undvika detta behöver deltagarens, organisationens och nätverkets utvecklingssyfte tydliggöras från början.</p><p>Analysen leder fram till en idealmodell av en utvecklingsprocess med stöd av nätverk. I modellen stimulerar gemensamma reflektionen över praktiska erfarenheter ett kreativt lärande som ger nya kunskaper och idéer i utbyte. När dessa ska överföras och tillämpas i verksamheten behövs en utvecklingsorganisation med en ledning som kan ta ett strategiskt helhetsgrepp över förändringsprocessen.</p><p>Slutsatserna talar för lärande nätverk som ett stöd i utvecklingsprocessen. De talar för fortsatt forskning för att pröva idealmodellen och för att fördjupa kunskaperna om absorberingssvårigheten och strategibristen.</p>
  • Homayoun, Saeid (författare)
  • Internet corporate reporting disclosure and transparency
  • 2012
  • Doktorsavhandling (övrigt vetenskapligt)abstract
    • <p>The recent wave of well-publicized global corporate accounting scandals has highlighted the importance of the enhanced adoption of Internet technology and hence the increased transparency resulting from the enhanced disclosure of firm information. The objective of this study is to explore and identify Internet corporate reporting (ICR) disclosure in a context of publically listed firms. On a descriptive level, this thesis show that a considerable portion of publically listed firms have relativity high quality in their ICR disclosure, which is indicated by results showing that publically listed firms publish reasonably well-developed Internet-based reporting. In line with the Financial Accounting Standards Board, this thesis depicts characteristics of ICR disclosure practice by outlining the extent of content and presentation. As an indication of the quality of ICR, on average, the frequency of the identified items disclosed by the firms for the content of their websites was higher than for the presentation ofinformation. One of the characteristics of presentation format is extensible business reporting language (XBRL). Consequently, the thesis also seeks to identify the important factors that drive publically listed firms to adopt of XBRL by conducting open-ended interviews. At the explanatory level, the results in this thesis indicate that among firm characteristics and the variables identified as important determinants for the disclosure of firm information in general, only profitability (proxy by return of equity) shows significant association with the extent of ICR disclosure. In addition, the thesis results show that among corporate governance mechanisms, only board size influences the ICR disclosure of firms. The thesis offers an integrated model for ICR disclosure and transparency anchored in multiple theoretical lenses and contributes to the field of corporate Internet reporting. The integrated model is based on four complementary theories: agency theory, stakeholder theory, signaling theory and legitimacy theory. Accordingly, the framework offers the potential for a rich understanding of the phenomena of internet corporate reporting disclosure practice and determinants.</p>
  • Jahncke, Helena, 1982- (författare)
  • Cognitive Performance and Restoration in Open-Plan Office Noise
  • 2012
  • Doktorsavhandling (övrigt vetenskapligt)abstract
    • <p>This dissertation presents four experimental studies (in four papers) with the overall aim to investigate the effects of office noise on cognitive performance and restoration. In the first two papers the focus was on the effects of different sound levels (i.e., the mean level from all sound sources at an office, such as speech, phones, people walking) on performance, fatigue and stress. In the last two papers the focus was on the effects of background speech, as this has previously been shown to be the most disturbing noise source in open-plan offices. Paper I demonstrated decreased word memory performance, increased fatigue and motivational deficits when the background sound level increased by 12 dB, from 39 to 51 dB LAeq. Paper II showed that the sound level effects were more pronounced for individuals with a hearing impairment. Unexpectedly, no effects were found of acute noise exposure on the participant´s stress hormone levels (Paper I and Paper II).</p><p>          Regarding effects of irrelevant speech, Paper III showed that cognitive performance decreased as a function of background speech intelligibility, the higher the intelligibility depicted by the Speech Transmission Index (STI), the worse the performance. The results indicated that the STI-value must be less than 0.50, to avoid a negative influence on performance. Further, both Paper III and IV showed that performance is more impaired by background speech if the focal task requires episodic memory and rehearsal—such as word memory and information search. Interestingly, some tasks were insensitive for speech.</p><p>          The restorative effects of a break were addressed in Paper I and II (i.e., directly after the work sessions in noise). The break period differed in content between the participants. Paper I showed that a break with a nature movie with corresponding sound increased energy ratings compared to just listening to river sounds or office noise. Continued exposure to office noise gave the lowest ratings of motivation after the break. Paper II showed improved arithmetic performance and motivation after the break with a nature movie and decreased performance and motivation after continued noise exposure. For the hearing impaired participants, however, continued noise during the break increased motivation and performance, while the movie did not.</p><p>          Taken together, the current thesis demonstrates that open-plan office noise can have a negative impact on fatigue, motivation and performance. How much performance is impaired varies with the cognitive processes required by the tasks performed and hearing status. Moreover, continued noise exposure during a short break can further decrease motivation and subsequent performance.</p>
  • Johansson, Christian, 1980- (författare)
  • Knowledge maturity as decision support in stage-gate product development a case from the aerospace industry
  • 2009
  • Doktorsavhandling (övrigt vetenskapligt)abstract
    • <p>In today’s fast-paced industry where fight for market share is fierce and reaching the market ahead of competition imperative, product development is a target for lead-time reductions. In this context, in product development in stage-gate processes, decisions need to be made even though knowledge and information are scarce and flawed. The challenge is how to support the decisions that are made in light of uncertainty and ambiguity. The thesis moves from analysing the role of the stage-gate process within the aerospace industry. The stage-gate process was more than a decision making mechanism, and instead a mechanism that facilitated communication, discussion and knowledge sharing between team members, as well as supported knowledge creation and shaping of the boundaries between people’s different perceptions of the knowledge base. However, the communicative and negotiative function of the stage-gate was highly dependent on the ability of the participating individuals to reflect on the status and quality of the available knowledge assets used throughout the process. To make this reflective activity an explicit part of the stage-gate practice, this thesis proposes the application of a knowledge maturity concept at the gates to raise the decision makers’ awareness of the status of the knowledge assets handled at the decision point. The knowledge maturity concept considers three basic dimensions: input, method/tool and experience/expertise in assessing the knowledge base maturity. The scale is intended to act as a boundary object, facilitating the knowledge creation process by highlighting the current status of the knowledge base and making stakeholders aware of the nature of the project’s uncertainties and ambiguities. In the knowledge maturity concept, its purpose is to support design teams at the gates in taking appropriate action, mitigating risk and focusing their efforts on improving the knowledge assets where it is needed most, regarding the situation at hand and, finally, to make more confident decisions.The thesis was developed within the EU FP6 VIVACE (Value Improvement through a Virtual Aeronautical Collaborative Enterprise) and EU FP7 CRESCENDO (Collaborative and Robust Engineering using Simulation Capability Enabling Next Design Optimisation) projects, and within the Faste Laboratory, a VINNOVA Excellence Centre involving partners from the Swedish manufacturing industry.</p>
  • Khodadad, Davood (författare)
  • Multiplexed Digital Holography incorporating Speckle Correlation
  • 2016
  • Doktorsavhandling (övrigt vetenskapligt)abstract
    • <p>In manufacturing industry there is a high demand for on line quality control to minimize therisk of incorrectly produced objects. Conventional contact measurement methods are usuallyslow and invasive, meaning that they cannot be used for soft materials and for complexshapes without influencing the controlled parts. In contrast, interferometry and digitalholography in combination with computers become faster, more reliable and highly accurateas an alternative non-contact technique for industrial shape evaluation. For example in digitalholography, access to the complex wave field and the possibility to numerically reconstructholograms in different planes introduce a new degree of flexibility to optical metrology. Withdigital holography high resolution and precise three dimensional (3D) images of themanufactured parts can be generated. This technique can also be used to capture data in asingle exposure, which is important when doing measurements in a disturbed environment.</p><p>The aim of this thesis is devoted to the theoretical and experimental development of shapeand deformation measurements. To perform online process control of free-formmanufactured objects, the measured shape is compared with the CAD-model to obtaindeviations. To do this, a new technique to measure surface gradients and shape based onsingle-shot multiplexed dual-wavelength digital holography and image correlation of speckledisplacements is demonstrated. Based on an analytical relation between phase gradients andspeckle displacements it is shown that an object is retrieved uniquely to shape, position anddeformation without the unwrapping problems that usually appear in dual-wavelengthholography. The method is first demonstrated using continues-wave laser light from twotemperature controlled laser diodes operating at 640 nm. Then a specially designed dual corediode pumped fiber laser that produces pulsed light with wavelengths close to 1030 nm isused. In addition, a Nd:YAG laser with the wavelength of 532 nm is used for 3D deformationmeasurements.</p><p>One significant problem when using the dual-wavelength single-shot approach is that phaseambiguities are built in to the system that needs to be corrected. An automatic calibrationscheme is therefore required. The intrinsic flexibility of digital holography gives a possibilityto compensate these aberrations and to remove errors, fully numerically without mechanicalmovements. In this thesis I present a calibration method which allows multiplexed singleshotonline shape evaluation in a disturbed environment. It is shown that phase maps andspeckle displacements can be recovered free of chromatic aberrations. This is the first time that a multiplexed single-shot dual-wavelength calibration is reported by defining a criteria tomake an automatic procedure.</p><p>Further, Digital Speckle Photography (DSP) is used for the full field measurement of 3Ddeformations. In order to do 3D deformation measurement, usually multi-cameras andintricate set-up are required. In this thesis I demonstrate the use of only one single camera torecord four sets of speckle patterns recorded by illuminating the object from four differentdirections. In this manner, meanwhile 3D speckle displacement is calculated and used for themeasurement of the 3D deformations, wrapping problems are also avoided. Further, the samescale of speckle images of the surface for all four images is guaranteed. Furthermore, a needfor calibration of the 3D deformation measurement that occurs in the multi-camera methods,is removed.</p><p>By the results of the presented work, it is experimentally verified that the multiplexed singleshotdual wavelength digital holography and numerically generated speckle images can beused together with digital speckle correlation to retrieve and evaluate the object shape. Usingmultidirectional illumination, the 3D deformation measurements can also be obtained. Theproposed method is robust to large phase gradients and large movements within the intensitypatterns. The advantage of the approach is that, using speckle displacements, shape anddeformation measurements can be performed even though the synthetic wavelength is out ofthe dynamic range of the object deformation and/or height variation.</p>
  • Löfstrand, Magnus, 1974- (författare)
  • A modelling and simulation approach for linking design activities to business decisions
  • 2007
  • Doktorsavhandling (övrigt vetenskapligt)abstract
    • <p>The business environment of the manufacturing industry is changing from a hardware-based product focus to a process and function focus. A current industrial interest is the development and sale of functions. This function could be realised as a product based on hardware, software and services, and may be sold as a function rather than as hardware. This function view is referred to as Functional Products (FP). The new focus for the customer is on value rather than hardware. This presents new challenges for how engineering hardware design may best be carried out. Sale of functional products requires a changed business model in which the price of the functional product is related to the functionality of the product itself; hence the name functional product. The supplier can in such a scenario no longer sell maintenance and spare parts. Instead, these activities become a cost, thus motivating the supplier to increase process efficiency, decrease internal production cost by using less energy per produced unit andincrease knowledge about use-cases. The researcher's challenge is how to create new knowledge regarding functional product development for academic as well as for industrial benefit. The research question was formulated as: How may methods or tools for design process modelling and simulation be developed to support functional product development? Four case studies were carried out in Swedish industry. Case study 1 was carried out in cooperation with Hägglunds Drives AB. Case study 2 was carried out in cooperation with companies Hägglunds Drives AB, Volvo Aero and Volvo Car Corporation. Case study 3 was carried out in cooperation Volvo Aero and Case study 4 was carried out in cooperation with nine industrial companies during the formation of the Faste Laboratory, Centre for Functional Product Innovation. Results include the need for integrating product development process and company strategy for functional product development and the identification of the need for new methods and tools to enable better understanding of technology and business processes. The research shows the possibility of evaluating cost and time of development before doing the actual product development work by modelling and simulating the design process. Thus, the knowledge that previously was implicit in the work process is made explicit and possible to manipulate for a desired outcome. Linking the future business cases to work processes by modelling and simulation enables knowledge re-use and work-process predictions concerning cost and time. Hence, modelling and simulation of work processes results in better knowledge of company development capacity earlier than before, thus allowing shorter reaction time to changes in the business domain.</p>
  • Oghazi, Pejvak (författare)
  • Supply chain management : an empirical study on Swedish manufacturing firms' enterprise systems adoption, supply chain integration, competition capability and performance
  • 2009
  • Doktorsavhandling (övrigt vetenskapligt)abstract
    • <p>Today’s marketplace is more fiercely competitive than ever before. Globalization, continual technological advances, and an ever-changing customer demand for new products have brought about new managerial practices and business models. New management approaches and unique business models emerge and fade constantly as managers strive to help their companies succeed in this less-predictable business world. However, communication and information technologies are offering new opportunities for businesses to compete in the global arena with a variety of tools. One area that has benefited the most from new technologies is supply chain management (SCM). Today, SCM could be a single, integrated function that is responsible for all aspects of material flow, as well as financial and information exchange among business partners within the chain. For several years, pundits have observed that the very nature of competition is changing. Some experts have even claimed that the day is rapidly approaching when companies will no longer compete against other companies. Instead, they foresaw a world in which supply chains will compete with other supply chains for market supremacy. The possibilities in a supply chain are indeed astounding, but the challenges that lie along the path to achieve excellence in supply chain integration are equally formidable. Companies are investing in systems, tweaking measures, and looking to technology and people to find the key to more effective interorganizational cooperation. To help future managers achieve success in this arena, this PhD project articulates a support measure intended to underscore the importance of supply chain integration for the focal firm in terms of better competition capability and performance. A proposed research model and seven hypotheses were developed in this PhD project. A survey was conducted among Swedish manufacturing companies, which resulted in 422 complete and usable responses, with an effective response rate of 65.8%. The hypotheses were tested using Structural Equation Modeling. Additionally, the moderating and mediating effects were also tested in this study. The results obtained for this thesis suggest that a significant relationship exists between the perceived benefits of SCM integration and the adoption of different enterprise systems. With regard to the core issues of this thesis regarding the connection between supply chain integration, competition capability, and firm performance, the findings strongly indicate a positive and direct relationship between these constructs. Furthermore, the present study also determined that the competition capability of a firm mediates the relationship between supply chain integration and the performance of the firm. Consequently, firms that strive to achieve superior performance, and thus establish a strong position in the marketplace, should consider a genuine integration level with their supply chain partners. For this reason, the adoption of different enterprise systems facilitates the achievement of a high-level integration across the supply chain. It is also important to recognize that establishment of a high integration level is essential to achieving superior performance and a strong competition capability in the market today and in the future.</p>
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