| 41. |
- Abrahamson, Martin, 1977-
(författare)
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Shareholders and Cherry-Picking IPOs : Studies on Shareholders, Initial Public Offerings and Firm Ownership Structure
- 2020
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This dissertation explores investor characteristics and shareholdings of publicly traded Swedish firms. The dissertation consists of an introductory chapter, three published papers, and one working paper. All four papers use Swedish data. Two of the studies examine initial public offerings (IPOs) and the ownership structure; one explores first-time shareholders, and one examines IPOs and first-time shareholders.Paper I studies IPOs with the focus on initial return, the allocation of the shares and inside holdings. The paper presents evidence on allocation of shares to institutional and individual investors. The paper highlights the information asymmetry between institutional and individual investors and shows a wealth transfer from old to new shareholders. The results also show that money left on the table is received primarily by institutions rather than individual investors.Paper II explores the characteristics of first-time shareholders (rookies). I portray the rookies of the stock market and present a model to explain portfolio characteristics. The results show that despite the trend of individuals leaving the stock market, there are new individuals investing in stocks. I also show that gender balance among individual shareholders is rather even, which contradicts approximations of previous studies in other countries. The paper also raises the concern of diversifying stock portfolios, as the average portfolio holds less than four shares for all individuals and less than two for rookies. Paper III studies the relationship between IPOs and rookies. The paper highlights whether rookies invest in IPOs. The results show that besides bringing new firms to the stock market, IPOs contribute to that market, as they attract rookies to invest in the IPOs. The results also show that the return for rookies investing in IPOs is lower compared with rookies investing in non-IPOs.Paper IV studies the relationship between offer price and post-IPO ownership structure. The paper uses price groups and two definitions of breadth of ownership in the analyses. The results show that firms can affect their post-IPO ownership structure through the offer price.
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| 42. |
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| 43. |
- Abrahamsson, Christian, 1977-
(författare)
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Topoi/graphein
- 2008
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The aim of this thesis is to map the paradoxical limit of the in-between. In its most basic form the thesis is a paradox in itself, for how am I to comprehend and communicate the ever-changing world in a language which is characterised by fixed points and stable relations? The thesis consists of three main parts: a prologue, six chapters and an epilogue. Each of these parts can be read separatly, but togheter they form a set of conceptual maps whose focus is on the displacements, transpositions, juxtapositions, fluctuations and transformations that fill the gap between delimited categories. In the prologue, Primo Levi's question from Auschwitz – "is this a human being?" – is transposed into the infamous images from Abu Ghraib. The prologue is followed by a section entitled Topoi/graphies, in total six chapters organized into two columns with three chapters in each. In the first pair of chapters we are in the taken-for-granted space of identity thinking, the world of the Euclidian fixed point. In the second pair the taken-for-granted universe of the fixed point has all but evaporated and we are instead witnessing how relations are being stabilized. In the third pair there is the horror of neither fixed points nor relations. Rephrased, the six chapters enact a journey that starts within a fixed spatiality in which human thought-and-action is anchored in the given of identity. It then moves through a social world in which the spatio-temporal transformations are neither fixed nor taken-for-granted. Finally it edges into a pure temporality that lies beyond the maps of fixed points and social relations.It is in its own topic that the thesis cannot come to a definite conclusion. The epilogue nevertheless reaches out for a conceptual synthesis – nine minimalist figures with accompanying texts.
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| 44. |
- Abrahamsson, Emma, 1978-
(författare)
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Att formulera problem i barnpsykiatriska samtal
- 2023
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The present study explores problem-formulation processes in Swedish child and adolescent psychiatry (Sw. Barn- och ungdomspsykiatri, BUP), drawing on an ethnomethodological conversation analytic approach to institutional talk. Data consists of video and audio recordings of 15 initial assessments, one therapeutic contact (six sessions) and one neuropsychiatric assessment (12 sessions), with children and adolescents aged 10 to 17. Shorter sequences as well as longer processes spanning several sessions are analyzed. While much prior research has examined caregiver-clinician interaction in cases involving younger children, the present study explicitly focuses on the child as an active participant.The analyses of the initial assessments demonstrate how children resist caregivers’ problem formulations by presenting alternative versions of these formulations that draw on their in-depth knowledge of their own everyday life. Clinicians’ strategies of orchestrating the talk in these sequences are shown to be critical in balancing children’s and caregivers’ relative epistemic status. In the therapeutic interactions, the analyses focus on how the participants use reported speech as an interactional resource to illustrate problematic communication patterns in the family, to model alternative courses of action, and to communicate therapeutic change. In these encounters, the child takes an active role in the process of problem formulation. Finally, neuropsychiatric assessment interactions are analyzed with a focus on the clinical sense-making process through which a shared understanding of the child’s problems is negotiated in initial and concluding phases of the contact.Through attending to clinical sense-making in negotiations between adolescents and caregivers, the study provides nuance to the image of medical interaction as primarily characterized by tensions between contrasting life-world and medical perspectives. The concluding discussion addresses how knowledge claims and conflicting versions of psychiatric problems are managed in multi-party interactions, as well as how boundaries between normality and deviance are negotiated in processes of interaction.
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| 45. |
- Abrahamsson, Gun, 1961-, et al.
(författare)
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Problemlösningsarbete på låg organisatorisk nivå : Två studier om implementering respektive konkretisering av idéer om kundorderstyrd tillverkning
- 2004
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The two studies reported in this thesis are about problem solving at a low organisational level in an organisational unit in a Swedish manufacturing company, which has adopted ideas of World Class Manufacturing. In the first study, we analyse, from an organisational learning perspective, the implementation of the well-known concept Continuous Improvement at shop-floor level and how management accounting may facilitate or impede improvement work. A case study was conducted in two workgroups in one production unit for about seven months. In one of the groups, management accounting facilitated improvement work with high organisational scope and, in the other group, impeded the organisational scope. Our conclusion is that management accounting may facilitate a high organisational scope by supporting the leadership style, stressing co-operation, dialog and participation, or, by the way the manager uses management accounting, make boundaries distinct between groups of employees and between departments, and therefore impede improvements with high organisational scope. In the second study, we analyse, from a rule-based behavioural perspective, how ideas of World Class Manufacturing are institutionalised in cross-functional problem solving at a low organisational level. A case study was carried out in two cross-functional weekly group meetings for about nine months. Problems raised and solutions decided followed a repeated pattern. The actors draw on instrumental rules, which can be described as technical as well as economic. We concluded that ideas of World Class Manufacturing were institutionalised as different variants of World Class Manufacturing in the different functions at a low organisational level. At the meetings, contradictory instrumental rules were activated by the functions and treated according to interaction rules. Two overall patterns of action, articulated the two main interaction rules guiding actors in how to treat contradictory ideas of World Class Manufacturing.
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| 46. |
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| 47. |
- Abrahamsson, Johan, 1977-
(författare)
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Kinetic Energy Storage and Magnetic Bearings : for Vehicular Applications
- 2014
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- One of the main challenges in order to make electric cars competitive with gas-powered cars is in the improvement of the electric power system. Although many of the energy sources currently used in electric vehicles have sufficientlyhigh specific energy, their applicability is limited due to low specific power. It would therefore be advantageous to create a driveline with the main energy storage separated from a smaller energy buffer, designed to have high power capabilities and to withstand frequent and deep discharge cycles. It has been found that rotating kinetic energy storage in flywheels is very well suited for this type of application.A composite shell, comprising an inner part made of glassfiber and an outer part made of carbonfiber, was analyzed analytically and numerically, designed, and constructed. The shell was fitted onto a metallic rotor using shrinkfitting. The cost of the shell, and the complexity of assembly, was reduced by winding the glass- and carbonfiber consecutively on a mandrel, and curing the complete assembly simultaneously. Thereby, the shell obtained an internal segmentation, without the need for fitting several concentric parts onto each other. The radial stress inside the composite shell was kept compressive thanks to a novel approach of using the permanent magnets of the integrated electric machine to provide radial mechanical load during rotation.Two thrust bearing units (one upper and one lower) comprising one segmented unit with the permanent magnets in a cylindrical Halbach configuration and one non-segmented unit in a up/down configuration were optimized, constructed and tested. Each thrust bearing unit generated 1040 N of repelling force, and a positive axial stiffness of 169 N/mm at the nominal airgap of 5 mm. Two radial active magnetic bearings (one upper and one lower) were optimized, constructed and tested. By parameterizing the shape of the actuators, a numerical optimization of force over resistive loss from the bias currentcould be performed. The optimized shape of the electromagnets was produced by watercutting sheets of laminated steel. A maximum current stiffness of120 N/A at a bias current of 1.5 A was achieved.
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| 48. |
- Abrahamsson, Malin L. A.
(författare)
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Electron Transfer in Ruthenium-Manganese Complexes for Artificial Photosynthesis : Studies in Solution and on Electrode Surfaces
- 2001
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- In today’s society there is an increasing need for energy, an increase which for the most part is supplied by the use of fossil fuels. Fossil fuel resources are limited and their use has harmful effects on the environment, therefore the development of technologies that produce clean energy sources is very appealing. Natural photosynthesis is capable of converting solar energy into chemical energy through a series of efficient energy and electron transfer reactions with water as the only electron source. Thus, constructing an artificial system that uses the same principles to convert sunlight into electricity or storable fuels like hydrogen is one of the major forces driving artificial photosynthesis research.This thesis describes supramolecular complexes with the intention of mimicking the electron transfer reactions of the donor side in Photosystem II, where a manganese cluster together with a tyrosine catalyses the oxidation of water. All complexes are based on Ru(II)-trisbipyridine as a photosensitizer that is covalently linked to electron donors like tyrosine or manganese. Photochemical reactions are studied with time-resolved transient absorption and emission measurements. Electrochemical techniques are used to study the electrochemical behavior, and different photoelectrochemical techniques are used to investigate the complexes adsorbed onto titanium dioxide surfaces. In all complexes, intramolecular electron transfer occurs from the linked donor to photo-oxidized Ru(III). It is also observed that coordinated Mn(II) quenches the excited state of Ru(II), a reaction that is found to be distance dependent. However, by modifying one of the complexes, its excited state properties can be tuned in a way that decreases the quenching and keeps the electron transfer properties. The obtained results are of significance for the development of multinuclear Ru-Mn complexes that are capable of multi-electron transfer.
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| 49. |
- Abrahamsson, Maria, 1975-
(författare)
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Tuning of the Excited State Properties of Ruthenium(II)-Polypyridyl Complexes
- 2006
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Processes where a molecule absorbs visible light and then converts the solar energy into chemical energy are important in many biological systems, such as photosynthesis and also in many technical applications e.g. photovoltaics. This thesis describes a part of a multidisciplinary project, aiming at a functional mimic of the natural photosynthesis, with the overall goal of production of a renewable fuel from sun and water. More specific, the thesis is focused on design and photophysical characterization of new photosensitizers, i.e. light absorbers that should be capable of transferring electrons to an acceptor and be suitable building blocks for supramolecular rod-like donor-photosensitizer-acceptor arrays. The excited state lifetime, the excited state energy and the geometry are important properties for a photosensitizer. The work presented here describes a new strategy to obtain longer excited state lifetimes of the geometrically favorable Ru(II)-bistridentate type complexes, without a concomitant substantial decrease in excited state energy. The basic idea is that a more octahedral coordination around the Ru will lead to longer excited state lifetimes. In the first generation of new photosensitizers a 50-fold increase of the excited state lifetime was observed, going from 0.25 ns for the model complex to 15 ns for the best photosensitizer. The second generation goes another step forward, to an excited state lifetime of 810 ns. Furthermore, the third generation of new photosensitizers show excited state lifetimes in the 0.45 - 5.5 microsecond region at room temperature, a significant improvement. In addition, the third generation of photosensitizers are suitable for further symmetric attachment of electron donor and acceptor motifs, and it is shown that the favorable properties are maintained upon the attachment of anchoring groups. The reactivity of the excited state towards light-induced reactions is proved and the photostability is sufficient so the new design strategy has proven successful.
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| 50. |
- Abrahamsson, Niclas, 1976-
(författare)
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On the Impact of Bariatric Surgery on Glucose Homeostasis
- 2016
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Obesity has grown to epidemic proportions, and in lack of efficient life-style and medical treatments, the bariatric surgeries are performed in rising numbers. The most common surgery is the Gastric Bypass (GBP) surgery, with the Biliopancreatic diversion with duodenal switch (DS) as an option for the most extreme cases with a BMI>50 kg/m2.In paper I 20 GBP-patients were examined during the first post-operative year regarding the natriuretic peptide, NT-ProBNP, which is secreted from the cardiac ventricles. Levels of NT-ProBNP quickly increased during the first post-surgery week, and later established itself on a higher level than pre-surgery.In paper II we report of 5 patient-cases after GBP-surgery with severe problems with postprandial hypoglycaemia that were successfully treated with GLP-1-analogs. The effect of treatment could be observed both symptomatically and in some cases using continuous glucose measuring systems (CGMS).In paper III three groups of subjects; 15 post-GBP patients, 15 post-DS, and 15 obese controls were examined for three days using CGMS during everyday life. The post-GBP group had high glucose variability as measured by MAGE and CONGA, whereas the post-DS group had low variability. Both post-operative groups exhibited significant time in hypoglycaemia, about 40 and 80 minutes per day <3.3mmol/l and 20 and 40 minutes < 2.8mmol/l, respectively, longer time for DS-group. Remarkably, only about 20% of these hypoglycaemic episodes were accompanied with symptoms.In Paper IV the hypoglycaemia counter regulatory system was investigated; 12 patients were examined before and after GBP-surgery with a stepped hypoglycaemic hyperinsulinemic clamp. The results show a downregulation of symptoms, counter regulatory hormones (glucagon, cortisol, epinephrine, norepinephrine, growth hormone), incretin hormones (GLP-1 and GIP), and sympathetic nervous response.In conclusion patients post bariatric surgery exhibit a downregulated counter regulatory response to hypoglycaemia, accompanied by frequent asymptomatic hypoglycaemic episodes in everyday life. Patients suffering from severe hypoglycaemic episodes can often be treated successfully with GLP-1-analogues.
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