| 1. |
- A. Manneh, Ilana, 1970-
(författare)
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Supporting Learning and Teaching of Chemistry in the Undergraduate Classroom
- 2019
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- 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.
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| 2. |
- Kumar Wagri, Naresh, 1988-
(författare)
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Assessment of bio-based fuel ash effects on magnesia refractory materials in quicklime production kilns
- 2023
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Limestone is calcined into quicklime in lime kilns at temperatures above 1000°C. Heat is supplied through combustion inside the kilns, which are insulated with a lining of refractory bricks to mitigate heat loss and to protect the kiln from the hot, chemically aggressive, and mechanically abrasive environment. While magnesia bricks have proven to be effective lining materials, they are still susceptible to extensive wear in lime kilns, especially in the burn zone. Refractory corrosion, in particular, can occur when melted fuel ash infiltrates the refractory materials through pores and small cracks. This resultant wear can lead to high maintenance and operational costs, often due to unplanned kiln shutdowns.To reduce the release of fossil-based carbon dioxide into the atmosphere from lime production kilns, there is a growing interest in introducing bio-based fuels with only relatively minor modifications to the process. Biomass fuels can be sourced from bio-based waste streams from industries or be specifically cultivated for combustion. However, the ash content and properties of bio-based fuels tend to be problematic from an ash chemistry perspective. Therefore, before introducing a new fuel source, it is essential to investigate its potential effects on the kiln lining material. In this thesis work, the interactions between melted olive pomace ash and coal ash with commercially available magnesia refractory materials, primarily composed of periclase (MgO) with minor amounts of spinel (MgAl2O4), were studied. A procedure for quantifying the intrusion depths was described. Refractory samples were exposed to the fuel ashes under a simulated lime kiln atmosphere with high CO2 levels at 1200 and 1400°C for 15 and 60 minutes. Cold crushing strength tests were conducted on refractory samples exposed to coal and olive pomace ash, along with CaO powder, at 1400°C for 96 hours. Additionally, postmortem analyses of spent MgO-based refractory bricks were carried out to investigate their chemical characterization and resistance to slag attack after serving as part of the lining in a quick lime rotary kiln for six months.The morphology and elemental compositions of the exposed samples were examined using scanning electron microscopy and energy-dispersive X-ray spectroscopy. Crystalline phases were investigated with powder X-ray diffraction. Thermodynamic equilibrium calculations were performed to further investigate the ash’s melting behavior in contact with the refractories.The results indicated that the potassium-rich olive pomace ash exhibited a greater tendency to infiltrate compared to the silicon-rich coal ash, while the latter formed a glassy melt layer on top of the refractory samples. The ash slags primarily infiltrated through the porous matrix and grain boundaries of the refractory materials. Also, refractory phases were observed in both types of ashes, indicating migration of refractory constituents. K2MgSiO4 phase was found in the olive pomace ash residues on top of the samples, both for the 1200°C and 1400°C exposures. Similarly, Al6Si2O13 phase was dominant in the residual coal ash, in both the 1200°C and 1400°C exposed samples. None of these phases were present in the original ashes.The results of the postmortem analysis revealed that there was no potassium (K) from the fuel ash present on the hot side of the refractory bricks. However, some K was detected in the middle and back parts of the bricks. On the other hand, some phases, possibly connected to degradation, could be found on the hot side of the bricks, where most of the wear was observed.The crushing strengths increased after exposure for all samples, except for those exposed exclusively to coal ash. One possible explanation for this is that the refractory materials exhibited a sintered structure, as a result of their interaction with the ashes and CaO. However, in the samples exposed to coal ash, forsterite (Mg2SiO4) was identified, which can be considered a corrosion product.
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| 3. |
- Pham, Lan Anh, 1991-
(författare)
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On avoiding and completing colorings
- 2019
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- All of my papers are related to the problem of avoiding and completing an edge precoloring of a graph. In more detail, given a graph G and a partial proper edge precoloring φ of G and a list assignment L for every non-colored edge of G, can we extend φ to a proper edge coloring of G which avoids L? In Paper I, G is the d-dimensional hypercube graph Qd, a partial proper edge precoloring φ and a list assignment L must satisfy certain sparsity conditions. Paper II still deals with the hypercube graph Qd, but the list assignment L for every edge of Qd is an empty set and φ must be a partial proper edge precoloring of at most d-1 edges. In Paper III, G is a (d,s)-edge colorable graph; that is G has a proper d-edge coloring, where every edge is contained in at least s-1 2-colored 4-cycles, L must satisfy certain sparsity conditions and we do not have a partial proper edge precoloring φ on edges of G. The problem in Paper III is also considered in Paper IV and Paper V, but here G can be seen as the complete 3-uniform 3-partite hypergraph K3n,n,n, where n is a power of two in paper IV and n is an even number in paper V.
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| 4. |
- Wikman, Lars, 1981-
(författare)
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Don’t Mention the War : The forging of a domestic foreign policy consensus on the entry, expansion and exit of Swedish military contributions to Afghanistan
- 2021
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Consensus is not something that just happens in the foreign policy domain when political actors seemingly agree on a policy. Rather, in this dissertation I demonstrate that actors construct consensus through the framing of policy as they highlight and downplay certain elements. Interestingly, for consensus to emerge, the attraction of political support is not always necessary; sometimes it is enough to not mobilize opposition. In the Swedish context a “foreign policy line” [utrikespolitisk linje] captures the prevailing consensus view and embraces a particular understanding of foreign policy in the national interest, historically conditioned and elevated above party politics. Based on archival records and 55 interviews, this dissertation explores and analyzes the political process in which a domestic foreign policy consensus was constructed for the entry, expansion and exit of the Swedish military contributions to Afghanistan in the early 2000s.Advocates and opponents frame their preferred policy with the intention of aligning it with a dominating perception of the continuity of Swedish foreign policy to gain wider acceptance. In the case of military contributions to Afghanistan, distancing themselves from sensitive issues such as the US warfare and framing policy so it resembled traditional Swedish foreign policy was a way for advocates to suppress political conflict within the political left and rally support behind the respective government's proposition. Afghanistan was a defining military operation at a pivotal time for Swedish foreign policy. The results therefore have wider implications for our understanding of the domestic politics of Swedish foreign policy, providing an important view of how a general reorientation following the Cold War was managed. In addition to conceptualizing the “foreign policy line” this study contributes theoretically with two frame alignment strategies, which actors employ when faced with an unfavorable context to avoid negative connotations.
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| 5. |
- Awad, Amar, 1988-
(författare)
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Functional brain imaging of sensorimotor dysfunction and restoration : investigations of discomplete spinal cord injury and deep brain stimulation for essential tremor
- 2022
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The nervous system exists to generate adaptive behaviour by processing sensory input from the body and the environment in order to produce appropriate motor output, and vice versa. Consequently, sensorimotor dysfunction is the basis of disability in most neurological pathologies. In the current thesis, I explore two conditions with different types and degrees of sensorimotor dysfunction by means of functional magnetic resonance imaging (fMRI). In part 1, I assess residual sensory connections to the brain in clinically complete spinal cord injury (SCI) with seemingly complete loss of sensorimotor function below the injury level. In part 2, fMRI is combined with deep brain stimulation (DBS) to investigate interventional mechanisms of restoring dysfunctional sensorimotor control in essential tremor (ET).Part 1: SCI disrupts the communication between the brain and below-injury body parts, but rarely results in complete anatomical transection of the spinal cord. In studies I and II, we demonstrate somatosensory cortex activation due to somatosensory (tactile and nociceptive) stimulation on below-level insensate body parts in clinically complete SCI. The results from studies I and II indicate preserved somatosensory conduction across the spinal lesion in some cases of clinically complete SCI, as classified according to international standards. This subgroup is referred to as sensory discomplete SCI, which represents a distinct injury phenotype with an intermediate degree of injury severity between clinically complete and incomplete SCI.Part 2: ET is effectively treated with DBS in the caudal zona incerta, but the neural mechanisms underlying the treatment effect are poorly understood. By exploring DBS mechanisms with fMRI, DBS was shown to cause modulation in the activity of the sensorimotor cerebello-cerebral regions during motor tasks (study III), but did not modulate the functional connectivity during resting-state (study IV).fMRI is a valuable tool to investigate sensorimotor dysfunction and restoration in SCI and DBS-treated ET. There is evidence for sensory discomplete SCI in about half of the patients with clinically complete SCI. DBS modulates DBS modulation of the activity in the sensorimotor cerebello-cerebral circuit during motor tasks, but not during resting-state, is action-dependent.
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| 6. |
- Privalov, Roman
(författare)
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After Space Utopia : Post-Soviet Russia and Futures in Space
- 2023
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Since the early 2000s, new projects of space expansionism have emerged, including the commercial-, military-driven and scientific projects to colonize the Moon and Mars. The new space expansionism followed a period of comparatively lower attention to space in international politics, and it is sometimes called the New Space Race by analogy to the 20th century Space Race between the USSR and the US. With the first Space Race, outer space became explicitly politicized and served as a locus of futuristic utopian social and political imagination, not least in the USSR and the socialist bloc. In this dissertation, I investigate the possible ways of constructing alternative social and political futures in and through space in post-Soviet Russia. Drawing theoretically on postcolonial critique of space expansionism, the concepts of biopolitical production and of assemblage, and methodologically on narrative analysis, I argue that social and political futurism in and through space today presupposes changing attitudes to space and time in a way that challenges analyses from the angles of political science and IR. In this thesis, I highlight socially and politically futuristic practices which exist on the margins of political power and have greater autonomy from official discourse, arguing for the understanding of utopia in postmodernity as an assemblage.
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| 7. |
- Stål, Herman, 1977-
(författare)
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Inertia and practice change related to greenhouse gas reduction : Essays on institutional entrepreneurship and translation in Swedish agri-food
- 2014
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- To avoid dangerous climate change a massive reduction in greenhouse gas emissions is required in a relative short time span. However, as development is moving in the wrong direction, there appears to be great inertia in changing activities. This dissertation’s overarching purpose is, from an institutional perspective, to advance the understanding of greenhouse gas-related inertia, as well as change, in industrial agri-activities. This purpose is addressed in four individual but related papers and an introductory chapter. A case study methodology is utilized to advance knowledge regarding greenhouse gas-related inertia and change. Two change initiatives involving the Swedish Board ofAgriculture, the designated expert authority on agricultural matters, were chosen and explored with qualitative methods. The first case consisted of a project to create at an Action Plan, a policy suggestion regarding strategies to reduce emissions from agriculture. The second case focused on the Swedish Board of Agriculture’s co-owned agricultural extension service, Greppa Näringen. More specifically, the case consisted of the provision of climate advice to farmers. The analyses of the initiatives focused on assessing, discussing and explaining the types of change advanced within them. The papers show how and why convergent rather than divergent change was pursued, describing different mechanisms generating this inertia.
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| 8. |
- Burström, Thommie, 1964-
(författare)
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Organizing boundaries in early phases of product development : The case of an interorganizational vehicle platform project setting
- 2010
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This dissertation concerns the development of a new interorganizational vehicle platform in the truck industry. The studied project setting was large, and can be referred to as a mega project. I ask the question How are boundaries organized in an interorganizational vehicle platform project setting, and how can we understand the tensions which arise when such organizing is performed? I assume that tensions arise in relation to questions concerning novelty, interdependencies, and differences. Tensions should therefore not be seen as something bad, tensions are rather a prerequisite for achieving change. The overall aim is to create insights in how boundaries in an interorganizational platform project setting are organized between: projects and governing actors, projects and permanent organizations, projects and external organizations, projects and projects, and finally inside projects (between different functions). A secondary aim is to understand the roles which actors, activities and objects play, and the tensions which are experienced, when boundaries are being challenged and organized. The study was performed during the concept phase, and a practice approach was used in order to capture the inner life of projects. A project setting with three projects was studied for three months, where I performed 68 interviews and observed 32 meetings. I have used a mix of narrative and alternate templates strategies and induced themes which constitute the base for the analysis. I assume that boundaries are socially constructed and I argue that traditional normative findings in project management studies should be complemented with findings from organizational theory, and therefore use a multidisciplinary theoretical base. I have combined theories relating to; boundary construction, projects, boundary actors, activities, objects, and coordination/integration. My analysis consists of two parts, in the first part I analyze value-, mandate-, and structural tensions and finds that actors in the setting; organize a commonality balancing area where decisions are affected by a mandates filter and need to be understood in relation to a coopetitive tensions model. In the second part of the analysis I have found that actors in the setting balance tensions and organize boundaries by performing four major Quality improvement loops based on a fragmented value base where boundary activities should be seen as having three dimensions; administrative, sharing, and political. The creation of the shared platform is simultaneously affected by strategic, operational, and functional efforts. This fact in combination with the size and uniqueness of the project setting, leads to the insight that technological innovation must be accompanied by organizational innovation. Therefore I have suggested that organizing of boundaries in interorganizational vehicle project settings should be understood as being performed through Concurrent Boundary Enactment.
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| 9. |
- Darehed, David, 1986-
(författare)
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The impact of organizational and temporal factors on acute stroke care in Sweden
- 2020
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Background: Acute stroke carries a high risk of morbidity and death, but early treatment can improve outcomes. Intravenous stroke thrombolysis (IVT) is one such treatment, it is however time-sensitive and show better outcomes the sooner it is given. Most studies on time to IVT so far have looked at fixed time-intervals, and studies of short delays in clinical practice are relatively scarce. Another well-established treatment is managing acute stroke patients in stroke units (SU). Admission rates to a SU as first destination of hospital care have improved over time in Sweden. In the past decade however, the rates have leveled out at around 75-80% without further improvement. A hypothesis is that in-hospital overcrowding contributes. Previous studies have shown that outcomes after stroke differ between hospital types, and also vary depending on time of admission, with higher mortality seen for off-hours, weekend and winter admissions. The reasons behind temporal variations are not fully understood, but it has been proposed that environmental, patient-related and organizational factors contribute. The overall aim of this thesis was to study the effect of organizational factors on quality of care and outcomes after stroke, primarily focusing on the role of in-hospital overcrowding, in-hospital time to IVT and time of admission, while also studying differences between hospitals.Methods: All papers in this thesis were based on data from the Swedish stroke register (Riksstroke), a national quality register that holds data on patient related factors, acute care and outcomes. Paper I included 13,955 patient admissions from 14 hospitals in Region Norrbotten and Region Skåne from 2011-2014, enriched with data on in-hospital bed occupancy. Papers II-IV included all 72 Swedish hospitals caring for patients with acute stroke. Paper II included data from 2011-2015 (N=113,862), paper III from 2011-2016 (N=132,744) and paper IV from 2010-2017 (N=14,132). Analyses included descriptive statistics, unadjusted analyses and multivariable adjusted analyses.Results: We found that each percent increase in in-hospital bed occupancy above 85% decreased admission rates to a SU as first destination of hospital care by 1.5% (odds ratio (OR) 0.985, 95% confidence interval (CI) 0.978-0.992), with significant differences between hospitals. Admission rates were also lower off-hours, compared to on-hours (OR 0.73, 95% CI 0.70-0.75). Over time, admission rates to a SU as first destination of hospital care decreased in university hospitals, while they increased in specialized non-university hospitals and community hospitals. Each minute delay in door-to-needle time (DNT) decreased the odds of 90-day survival by 0.6% (OR 0.994, 95% CI 0.992-0.996), increased the odds of ICH within 36 hours by 0.3% (OR 1.003, 95% CI 1.000-1.006), and led to significantly higher odds of a worsening in functional outcomes at 3 months by 0.3-0.4%. DNT within 30 minutes was most likely daytime, and varied between hospital types. 90-day survival was lowest for patients admitted in January (81.5%), and highest for those admitted in May (84.1%) (OR 1.28, 95% CI 1.17-1.40).Conclusion: We found that in-hospital overcrowding decrease admission rates to a SU as first destination of hospital care, and that even short delays in DNT decreases survival, increases ICH complications and leads to a worsening in functional outcomes in routine clinical practice. We also found that quality of care varied depending on time of admission and between hospitals, indicating unequal care. Organizational differences should be accessible through quality improvement efforts aiming to implement robust local guidelines for in-hospital stroke treatment.
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| 10. |
- Hamrén, Ellinor
(författare)
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A Nationalism of Good Intentions : Dilemmas of inclusion and exclusion
- 2021
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The dissertation analyses ethical aspects of nationalism and criticizes the nation-state paradigm. Based on theories that concern various forms of 'benign' nationalism, the dissertation explores fantasies of inclusion with the help of various 'positions'. The question is: How are national identities, which are able to include ethnic minorities, constructed to be ethically justifiable, and what do the fantasies that sustain these ideas look like? Empirically I have worked with media material and have conducted focus groups with various ethno-political activists in Sweden and Finland. These minority groups are discussed based on the positions they hold in relation to the idea of the nation, and also the positions they would hypothetically end up in if their ethno-political struggle were successful. The dissertation is based on a discourse theoretical approach, with specifically the concept of fantasy being utilised from the discourse theoretical framework. My conclusion is that what I call the 'Fantasy of Inclusion', that is, a fantasy that the discourse of nations has taught us to desire, is based on ignoring the ethnic character of different groups in cases where it becomes "uncomfortable" in order to maintain the idea of inclusion as 'benign'.
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