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Sökning: L4X0:1402 1544 > (2015-2019)

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41.
  • Bauer, Susanne (författare)
  • Dissolved and suspended transport of tungsten, molybdenum, and vanadium in natural waters
  • 2018
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • Some transition metals and metalloids occur primarily as oxyanions in natural waters including antimony, arsenic, chromium, molybdenum, tungsten and vanadium. These oxyanions can pass through cell walls along the same pathways as phosphate or sulfate. Some of these oxyanions are essential for life, but in high concentrations they become all toxic. Recent studies showed that tungsten probably is posing a risk to human health. The growing use of tungsten in industrial and military applications probably leads to an increased release of tungsten to the environment. It has also been shown that the use of studded winter tires in Sweden significantly increases tungsten concentrations in road runoff. Still, little is known about the geochemical cycling of tungsten in the environment as it has been considered to be a more or less inert element. Only a few studies deal with tungsten in natural waters. For example, for the Baltic Sea no concentration data have been published before this work and data on the suspended particulate fraction of tungsten in terrestrial and marine waters are scarce.This thesis contributes to the understanding of the distribution and behavior of tungsten, molybdenum and vanadium in natural waters under changing redox conditions, varying pH and different seasons. Particular attention is paid to the suspended particulate fraction of these elements, which is often neglected even though it can be of great importance. Tungsten, molybdenum and vanadium primarily occur as oxyanions in solution and can be adsorbed to particles, which determines their mobility.Molybdenum usually is very mobile, while vanadium has a tendency to adsorb to iron oxyhydroxides or to form organic complexes. Tungsten has many similarities with molybdenum, but it seems to be less mobile than molybdenum in natural waters.Tungsten and molybdenum have a similar abundance in the upper continental crust, but in the ocean molybdenum is almost 2000 times more abundant. A strong fractionation of these two elements occurs from land to the ocean, indicating a removal of W during mixing of river and seawater.This study comprises data from small streams in the boreal landscape of northern Sweden, major rivers (Kalix River and Råne River) and their estuaries discharging into the Baltic Sea. In the marine environment, sediment cores from the Bothnian Bay and water profiles at the stratified Landsort Deep have been studied. Apart from the spatial distribution, the temporal behavior of tungsten, molybdenum, and vanadium in was investigated. In the boreal environment snowmelt is playing a major role for their transport.All water samples were filtered through 0.22 pore size filters to define dissolved and suspended particulate fractions. The particulate fraction of all studied elements increases from streams to rivers. Especially during spring flood, particle transport becomes even more important. About 80% tungsten, 70% vanadium and 30% molybdenum occur in the particulate fraction during this event. During estuarine mixing, tungsten and molybdenum are released from the particles again. However, vanadium seems to be removed in both fractions, probably due to a different adsorption behavior. In the dissolved fraction molybdenum increased and vanadium decreased from land to the sea, while tungsten showed small variation in all surface waters.All three elements are affected by manganese redox cycling at the transition zone between oxic and sulfidic water at the Landsort Deep in the Baltic Sea. Adsorption of these oxyanions to the freshly formed manganese oxides plays an important role for their transport to the sulfidic zone. In contrast to molybdenum, dissolved tungsten is accumulated in the sulfidic environment. There is no effective removal mechanisms like for molybdenum, which is adsorbed to sulfides. Also in the sediment, redox cycling of manganese and iron affects the distribution of tungsten and molybdenum close to the water-sediment interface.
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42.
  • Behar, Etienne (författare)
  • Solar Wind Dynamics within The Atmosphere of comet 67P/Churyumov-Gerasimenko
  • 2018
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • In this thesis, we explore the dynamics of the solar wind as it perme-ates and flows through a tenuous cometary atmosphere, with a focuson the interaction observed at comet 67P/Churyumov–Gerasimenko.Seven comets had already been visited by nine different probes when the European spacecraft Rosetta reached comet Churyumov–Gerasimenko in August 2014. The mission was however the first to orbit its host comet, which it did for a total duration of more than two years, corre-sponding to a large part of the comet’s orbit around the Sun. This en-abled to study how the dynamics of the plasma environment evolvedas the comet itself was transformed from one of the smallest obstaclesto the solar wind in the Solar System when far away from the Sun, toa well-established magnetosphere at perihelion.Most of our efforts tackle the early part of this transformation, when the creation of new-born cometary ions starts to induce significant disturbances to the incident flow. During this stage, a kinetic descrip-tion of the interaction is necessary, as the system of interest cannot be reduced to a hydrodynamic problem. This contrasts with the situation closer to the Sun, where a fluid treatment can be used, at Churyumov–Gerasimenko as well as at previously visited comets.Rosetta was not a mission dedicated to plasma studies, however. It directly translates into a limited spatial coverage of the cometary plasma environment, which by its nature extends over several spatial scales. An approach solely based on the analysis of in-situ data cannot properly address the major questions on the nature and physics of the plasma environment of Churyumov–Gerasimenko. This thesis there-fore largely exploits the experimental–analytical–numerical triad of approaches. In Chapters 3 and 4 we propose simple models of the ion dynamics and of the cometary plasma environment, and these are tested against experimental and numerical data. Used together,they give a global description of the solar wind ion dynamics through the cometary atmosphere, that we explore in the 2-dimensional and 3-dimensional cases (Chapter 5). In Chapter 6, we propose a view onthe interaction and its fluid aspects when closer to the Sun.
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43.
  • Ben Kahla, Hiba, 1990- (författare)
  • Micro-cracking and delaminations of composite laminates under tensile quasi-static and cyclic loading
  • 2019
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • Aerospace industry is devoted to improving the aircraft performance while reducing its weight and limiting the emissions. Part of this objective can be accomplished with the use of high-performance long fibre reinforced polymer laminated composites. Being the first mode of damage under loading, intralaminar cracks initiate at the free edge of the off-axis plies and propagate along the respective fibre orientation. While these cracks grow as tunnels and increase in number, at some point two close cracks in plies of different off-axis orientation could intersect forming an envelope with the free edge. As loading continues, local delamination is expected within this envelope. The evolution and interactions of the different damage modes and the accumulation of damage under a specific loading are crucial in order to have a good understanding of the mechanisms and hence an accurate prediction of the mechanical properties´ degradation. This thesis is devoted to initiation and evolution of intralaminar cracking in plies and interlayer delamination in composite laminates.In the first part, quasi-isotropic Carbon Fibre/ Epoxy non-crimp fabric (NCF) laminates were studied under both quasi-static and cyclic loadings. The objective was to develop an efficient testing methodology for statistical damage evolution determination in Fatigue. The sequence of damage occurrences (intralaminar cracks in the different layers, delaminations at the different interfaces) loaded under quasi-static and tension-tension fatigue is first captured. To save characterisation time and costs, a simple model for predicting intralaminar cracking in laminates under cyclic loads was proposed and validated under low stress cyclic loads and low crack density. The model is based on Weibull distribution for the probability of cracking where part of parameters is obtained in quasi-static tests and part in a limited number of cyclic tests. The predictions of dependency of the cracking on the stress and number of cycles are validated against experimental observations of cracking in the 90-plies of quasi-isotropic NCF laminates as well as in tape based cross-ply laminates. In position where intralaminar cracks meet the specimen edge, local delaminations initiate due to the high 3D stress state. The delamination is further assisted by cracks in other off-axis plies, usually linking them. The average delamination length dependence on loading parameters is characterized and linked with the extent of the laminate stiffness reduction, showing using a simple ply-discount analysis that delaminations are the main reason for very large axial modulus reduction.In the second part, local delaminations and their effect on laminate stiffness are analysed using FEM. Expressions for the crack opening displacement (COD) determined using FEM are obtained and a modelling approach based on GLOB-LOC is performed for intralaminar crack case with local delaminations starting from the intralaminar crack. The delamination length is used as a parameter and studies are performed for different materials. Strong effect of delaminations on COD and on the axial modulus of the laminate is found. Finally, the last findings are used to simulate the damaged composite laminate behaviour in 4-point bending test. The bending stiffness of the laminate is significantly reduced by intralaminar cracks with delaminations. An approach, using the concept of the effective stiffness of the damaged ply is used. The so obtained effective stiffness matrix is a function of intralaminar crack density in the ply and the delamination length. The effective stiffness is used to calculate the bending stiffness of the damaged laminate. The laminate curvature calculated in this way is in a very good agreement with the curvature obtained in 3-D FEM simulations of the test with explicitly including cracks and delaminations in the model.
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44.
  • Berglund, Linn (författare)
  • From bio-based residues to nanofibers using mechanical fibrillation for functional biomaterials
  • 2019
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • Bio-based resource utilization in different forms has been driven by societal, industrial and academic research interests towards the development of “green”, sustainable materials from renewable sources. Within this context, exploiting biomass from different industrial residues is further advantageous from an environmental and economic point of view, leading to minimization of residues by means of waste treatment and to the development of high-addedvalue- products. Breaking down the cell wall structure to its smallest structural components is one means of turning bio-based residues into high-value products, leaving us with nanofibers. The aim of this work has been to understand how these nanofibers can be liberated from various cellulosic sources using mechanical fibrillation and how they can be assembled into functional hydrogels.The production of bio-based nanofibers as a sustainable bio-based material is in the early stages of commercialization and considerable research has been devoted to explore different methods of reaching nanoscale. However, the extraction process by chemical and/or mechanical means is still associated with a relatively high energy demand and/or cost. These are key obstacles for use of the material in a wide range of applications. Another challenge is that methods to characterize nanofiber dimensions are still being developed, with few options available as online measurements for assessing the degree of fibrillation. Allowing for assessment during the fibrillation process would enable not only optimization towards a more energy efficient fibrillation, but also matching of the nanofiber quality to its intended function, since different applications will require widely different nanofiber qualities. Energy-efficient fibrillation and scalability from industrial residues were explored using upscalable ultrafine grinding processes.Nanofibers from various industrial bio-residues and wood were prepared and characterized, including the development of a method for evaluation of the fibrillation process online via viscosity measurements as an indication of the degree of fibrillation down to nanoscale. Furthermore, the correlation of viscosity to that of the strength of the nanopapers (dried fiber networks) was evaluated for the different raw materials.Switchable ionic liquids (SIL) were tested as a green pretreatment for delignification, without bleaching of wood prior to fibrillation, with the aim to preserve the low environmental impact that the raw material source offers.In order to employ the hydrophilic nature and strong network formation ability of the fibrillated nanofibers, they were utilized in the preparation of functional biomaterials in the form of hydrogels. Firstly, brewer’s spent grain nanofibers were used to promote and reinforce hydrogel formation of lignin-containing arabinoxylan, resulting in a hydrogel completely derived from barley residues. In addition, alginate-rich seaweed nanofibers from the stipe (stem-like part of the seaweed) were used directly after fibrillation as an ink and hydrogels were formed via 3D printing.
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45.
  • Bhanbhro, Riaz, 1985- (författare)
  • Mechanical Behavior of Tailings : Laboratory Tests from a Swedish Tailings Dam
  • 2017
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • Tailings is leftover material from mining industry and is produced in huge quantities approximately 70-99% of the ore production.  Tailings material is stored as impoundments by constructing tailings dams which are often constructed with tailings material itself. Tailings are artificial material and the mechanical behavior of tailings material upon loading is different as compared to natural soil materials. There are number of dam failures reported every year which has severe impact on inhabitants and environment nearby. Considering the failures of tailings dams and consequences there is a need to understand the tailings material in depth for safe existence of these dams. The confident dam design can assure the safe existence of tailings dams for long term as these dams are presumed to function for generations to come. The material properties in tailings dams can change during operation due to raising of new layer. Raised new layer can change stress level, which in turn may change the material properties in terms of strength, pore pressures, grain sizes etc. Today mostly tailings dam are designed by performing analysis for safety for existing and future rasings as well. These analyses are based upon a for certain factor of safety. Not very much can be done with design and analysis for tailings material if the material is not described very well. Understanding of tailings material in depth can provide help for detailed material parameters which later can be used in safety assessment for future raising and changed conditions in dam.This study presents the work carried out on tailings material from a Swedish tailings dam. The study is conducted on undisturbed and disturbed tailings material. The undisturbed tests are carried out to understand material properties as per in-situ conditions. Whereas disturbed materials are used to created different materials with different particles sizes. Initially in this study the basic properties of tailings materials are studied e.g. specific gravity, phase relationships, particle sizes, particle shapes and shear behavior on collected samples at various depths. During direct shear tests, the unexpected vertical height reductions were observed, these results are presented in this study. The comparison of strength parameters by direct shear and triaxial tests on material from various depths is also done and presented.Based on results from direct shear, triaxial and oedometer tests on uniform sized tailings material; the evaluation of primary and secondary deformations and particle breakage and effect of vertical loads is also carried out and presented. The study also includes the comparison of strength parameters for each particles size. The breakage of particles is analyzed by sieving the material after direct shear tests followed by a particle shape study. The effect of deposition on shear strength parameters is also studied by construction of samples with different angle of deposition of material. The strength parameters of uniform sized particles in triaxial tests are also evaluated and discussed.
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46.
  • Bin Asad, S M Sayeed, 1985- (författare)
  • Laser Based Flow Measurements to Evaluate Hydraulic Conditions for Migrating Fish and Benthic Fauna
  • 2019
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • Hydropower is one of the main sources for Sweden’s energy, which is clean and renewable. It is a clean energy source because no fuels are burned which does not pollute the air and it is a renewable energy source as it only uses natural water cycle for generating energy. However, hydropower has some consequences in nature, such as creating dams in rivers and changing water flow directions, which alters the natural behaviour of the river. These problems are mostly studied from a biological point of view but more detailed studies are required from a fundamental fluid mechanics point of view. For instance, fish migrates when an ecological imbalance is created and one of the reasons for this imbalance is having dams for hydropower that alter the natural flow of the river. This flow alteration of the river flow has other environmental effects such as flow alteration changes benthic (bottom) structure of the riverbed or stream that affects the fish and invertebrates. Fishes, as well as invertebrates, are adapted for different flows and habitats but flow alteration affects their life cycles. Therefore, flow measurements when the flow is altered due to the hydropower are one of the important issues concerning environmental problems. These flow measurements in the lab scale can increase the understanding of what happens in a river when the flow is altered.Flow characteristic measurements can provide quantitative information on the velocity distribution in the altered flow. Recent studies suggest that turbulence created due to flow alteration has a major effect on fish migration, for example, attracting fishes to enter fishway. This is why obtaining flow information from well-defined turbulent flows, such as flow past cylindrical objects is one of the prime objectives of work. However, flow alteration due to the dam for hydropower production has a significant environmental effect on the river ecosystem. Lotic species often adapt to prevailing flow conditions; and as a crude example, two species of caddis larvae: Hydropsyche instabilis and Plectrocnemia conspersa respectively are found to thrive on fast and slow-moving water flows. For some instances, changes in river velocity may merely mean the relocation of one species whilst the flourishing of another. Therefore, flow measurement in stones embedded riverbed in lab scale is another important objective of this work.Particle Image Velocimetry (PIV) and Laser Doppler Velocimetry (LDV) have become the most popular and promising techniques for these types of non-contact flow measurements. PIV techniques are used to visualize and measure the flow characteristic in a selected area while LDV techniques are suited for point-based measurement.  The works included in this thesis are reviewing PIV techniques previously used in fish movement related studies, LDV measurements both at upstream (bow wake) and downstream wake of vertical cylindrical obstructions, Computational Fluid Dynamics (CFD) simulations to supplement wake information and PIV measurements over the horizontal semicircular cylinders to explore wall shear stress. Apart from this, flow visualization was also included in this work. The results from all these works can be useful to evaluate hydraulic conditions for migrating fish and benthic fauna.
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47.
  • Biswas, Amit (författare)
  • Effect of chemical and physical properties on combustion of biomass particle
  • 2015
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • Biomass combustion is an interesting alternative to fossil fuel. Modeling and simulation is used for design optimization of biomass boilers and furnace. It is difficult to develop a sufficiently accurate and computationally efficient model because the combustion system is highly complicated multi-scale, multi-phase and multi-physics problem. The study of biomass combustion in different scales allows engineers to understand the combustion process and tochoose necessary simplification to develop a computationally efficient model.The chemical and physical properties of fuels are altered during different fuel preparation methods (i.e. pretreatment and pelletization), and as a result the fuel conversion is also affected. The aim of this thesis is to understand thermal conversion of those chemically or physically altered fuels. Both experimental and modeling techniques were chosen to addressthe aim. Experiments were performed in thermogravimetric analysers, isothermal macro thermogravimeters (iTG), and a pot furnace to account fuel conversion in micro-, meso- and macro scale. In addition, three different types of mathematical model were developed. They are (i) a simplified particle pyrolysis model, (ii) two detailed numerical models that simulate particle pyrolysis and char oxidation and (iii) finally a computational fluid dynamic (CFD) model of combustion of biomass particles in a bed. The results indicate that both the intrinsic and the apparent conversion of the fuel wasinfluenced by the process conditions of fuel preparation methods. Intrinsic pyrolysis reactivitywas reduced due to mild pretreatment; however, it was increased with further increase in pretreatment severity. In contrary, severity of pelletization tends to reduce the apparent reactivity of pellets combustion. It was also investigated that how each physical and chemical parameter should be modelledfor a untreated biomass (i.e. wood logs) and a densified biomass (i.e. pellets) through parametric studies with a detailed particle simulation. The result shows that a model for wood logs should exclude convective heat transfer by volatiles if the fibers align to longitude direction while it is important part in the models for pellets. Devolatilization of wood logs was expressed as endothermic reactions while the model results showed best agreement withexperimental data of wood pellets when the heat of reaction was assumed to be zero, possibly due to the secondary reactions. Then, it was demonstrated that a constitutive equation, i.e. analytical solution of the shrinking core model, is sufficient to express devolatilization rate of thermally-thick particles at the temperature of 1173 K. While studying apparent oxidation of wood pellet char , it was found that change in intrinsic char oxidation reactivity due to different pyrolysis conditions does not influences the model prediction at high temperature. In addition, at high temperature, the reaction front became thin and reaction rate was hardly affected by temperature.It was also found by the simulation of pellet bed combustion that the apparent density of the particle significantly affected the flame velocity.
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48.
  • Bjuhr, Åsa, 1973- (författare)
  • Avslut och fortsättning : En studie om övergången från introduktionsprogrammet språkintroduktion till nationellt program vid gymnasieskolan
  • 2019
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • This thesis highlights elements of the schooling for newly arrived students aged 16-19 within the Swedish school system in six different municipalities, where the transition between the language introduction programme and national programme at upper secondary school is central. The main purpose is to provide knowledge of pupils' experiences of the aforementioned transition. In this thesis, the concept of transition has a broader and more abstract meaning than just the actual move from one activity to another, and the thesis also focuses on the time spent in the language introduction programme and the first months in a national program at upper secondary school.Three studies are included in this thesis, where discourse analysis, curriculum theory and organizational theory of the school are used as a theoretical framework. The first study is an analysis of syllabuses from 1980 to 2011 for the subject Swedish as a second language within primary and secondary schools. The second is a study that interviews teachers in the language introduction programme, and the third study is based on interviews with pupils who have studied language introduction programme, but at the time of the interviews were studying in their first semester on a national programme.The analyses show that the transition is governed by curriculum and regulations that teachers and students must adhere to. The teachers carry out their everyday work on the basis of curriculum and regulations, such as the Education Act, but also on the basis of the individual school's organization. From an organizational perspective, this gives teachers limited personal room for manoeuvre. It also appears that the choice of national programmes and other choices that students can make within the framework of their schooling are sometimes obvious to the students and made by the students themselves. Nevertheless, other times teachers and study counsellors make the choices without the students’ knowledge. An additional result shows that the students say they experience a discrepancy when it comes to teaching of the various school subjects in the language introduction programme and the national programme at upper secondary school. The linguistic support that the students received during the time at the language introduction programme is not perceived by the students to be at the same level as the national programme. A development of linguistic support in various subjects within the national programme could, from a didactic perspective, lead to a less abrupt transition for the students
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49.
  • Björklund, Cecilia (författare)
  • Temporal patterns of daily occupations and personal projects relevant for older persons’ subjective health : a health promotive perspective
  • 2015
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • Engagement in daily occupations has been shown to positively influence subjective health of older persons, but there is little knowledge of how such daily occupations should be temporally structured. This thesis is guided by two concepts to explore the temporal structure of daily occupations. Firstly, the concept temporal patterns of daily occupations are used to focus internal relationships and temporal order of daily occupations during 24-hour sequences. Secondly, the concept personal projects are used to focus sets of intentionally performed occupations structured to reach short- or long-term goals of a year. The overall aim of this thesis was to develop knowledge and understanding of temporal patterns of daily occupations and personal projects relevant for older persons’ health and well-being. This thesis includes four studies, according to a multi method sequential design. Participants in all four studies were recruited from retirement organizations in two municipalities in northern Sweden and all of them are living in their private urban or rural homes. For Study I and II, data of daily occupations and of health and well-being were collected from 151 older adults using open time-diaries completed for one week and two health questionnaires. A time-geographic method was used to analyze data from the time-diaries and descriptive and analytic statistics are applied for further analysis including the additional data from the two health questionnaires. The aim of Study I was to expand the knowledge regarding temporal patterns of daily occupations and to explore and describe older Swedish adults´ daily occupations from such a temporal pattern and time-use perspective. In Study I the temporal pattern of daily occupations of older persons was identified as real time-use and added time-use during 24-hour sequences. The pattern of real time-use showed i)a daily routine of six intervals ii) characteristic profiles illustrating number of participants in categorized occupations and iii) a pattern of merged categories of occupations. The pattern of added time-use for frequencies and durations of the 24-hour sequence showed a hierarchical structure with the highest frequencies and durations shown for care for oneself occupations followed by reflection and recreation, home-keeping, procure and prepare food, and transportation occupations (Study I). The aim of Study II was to identify characteristics of temporal patterns of daily occupations that could be related to high and low health among older adults in northern Sweden. The temporal pattern of daily occupations of older persons, identified as real time-use and added time-use during 24-hour sequences, showed similar patterns for groups of older persons reporting high and low health. Persons of high health reported higher frequencies and longer durations for home-keeping, procure and prepare food, and transportation occupations and lower frequencies and shorter durations for care for oneself and reflection and recreation occupations compared to the low health group (Study II). For Study III and IV, data of personal projects relevant for health and well-being were collected by interviews with 11 older persons selected from the high health subgroup in Study II. Data was analyzed by content analysis. The aim of Study III was to explore personal projects described by older persons in northern Sweden relevant to health and well-being during the forthcoming year. A coherent project system was developed. This system was structured as five core projects representing fourteen personal projects each including two to five sequential occupations, relevant to subjective health during the forthcoming year. The project system was anchored by the core projects: keeping the family together; enjoying one’s life at home; being close to nature; cultivating oneself; and promoting conditions for healthy ageing (Study III). In Study IV variations in occupational value were interpreted from older people´s personal projects relevant for health and well-being the forthcoming year. Variations in occupational value were identified from expressions in the 14 personal projects. Value dimensions of concrete and symbolic value were identified as the most frequently expressed and self-rewarding value as the least frequently expressed. Variations in occupational value within each personal project were shown as profiles of occupational value constructing the core projects. Profiles of occupational value of the core project cultivating one-self were dominated by concrete value while the remaining core projects were dominated by symbolic value (Study IV). Conclusions: This thesis contributes with knowledge of temporal patters of daily occupations described as real and added time-use during 24-hour sequences and the characteristics of such pattern showed for high health. Furthermore, it highlights a structure for a coherent project system relevant for occupational health during a year and the imbedded occupational value. This knowledge of the older persons’ structure and experiences of occupations may be used for promoting occupational health in different contexts. Keywords: elderly, temporal routines, structure of occupations, real time-use, added time-use, time-geographic method, core projects, personal projects, occupational value, health and well-being.
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