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Sökning: LAR1:hh > Doktorsavhandling

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1.
  • Aghaeipour, Mahtab (författare)
  • Tailoring the Optical Response of III-V Nanowire Arrays
  • 2017
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • Semiconductor nanowires show a great deal of promise for applications in a wide range of important fields, including photovoltaics, biomedicine, and information technology. Developing these exciting applications is strongly dependent on understanding the fundamental properties of nanowires, such as their optical resonances and absorption spectra. In this thesis we explore optical absorption spectra of arrays of vertical III-V nanowires with a special emphasis on structures optimized to enhance absorption in the solar spectrum. First, we analyze experimentally determined absorption spectra of both indium phosphide (InP) and gallium phosphide (GaP) nanowire arrays. The study provides an intuitive understanding of how the observed absorption resonances in the nanowires may be tuned as a function of their geometrical parameters and crystal structure. As a consequence, the spectral position of absorption resonances can be precisely controlled through the nanowire diameter. However, the results highlight how the blue-shift in the optical absorption resonances as the diameter of the nanowires decreases comes to a halt at low diameters. The stop point is related to the behavior of the refractive indices of the nanowires. The wavelength of the stop is different for nanowire polytypes of similar dimensions due to differences in their refractive indices. We then present a theoretical argument that it is important to consider symmetry properties when tailoring the optical modes excited in the nanowires for enhanced absorption. We show that absorption spectra may be enhanced compared to vertical nanowires at normal incidence by tilting the nanowires with normal incidence light, or by using off-normal incidence with vertical nanowires. This is because additional optical modes inside the nanowires are excited when the symmetry is broken. Looking forward to omnidirectional applications, we consider branched nanowires as a way to enhance the absorption spectra at normal incidence by taking advantage of simultaneous excitation of the spectrally different optical modes in the branches and the stems. Third, we describe in theoretical terms how integrating distributed Bragg reflectors (DBRs) with the nanowires can improve absorption spectra compared to conventional nanowires. DBRs provide a way to employ light trapping mechanisms which increases the optical path length of the excited modes and thereby improves the absorption of the excited modes. At normal incidence, DBR-nanowires improve the absorption efficiency to 78%, compared to 72% for conventional nanowires. We show that the efficiency is increased to 85% for an off-normal incident angle of 50˚. Overall, our results show that studies of optical resonances in nanowires that take the light-matter interaction into account provide opportunities to develop novel optical and optoelectronic functionalities in nanoscience and nanotechnology.
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2.
  • Ahlborg, Mikael, 1985- (författare)
  • Social capital and inequalities in mental health among young adolescents in Sweden
  • 2022
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • The aim of this thesis was to explore social capital and inequalities in mental health among young adolescents in Sweden. This is a compilation thesis comprising four studies. Studies I and II are quantitative studies of crosssectional data from the Swedish Health Behaviour in School-aged Children survey. The aim of Study I was to investigate socioeconomic inequalities in health using both a subjective and an objective measure of socioeconomic status among Swedish adolescents. The findings showed that subjective socioeconomic status robustly and independently predicted mental health problems, poor life satisfaction and poor general health perception. The association between objective socioeconomic status and mental health was weakened, and even reversed, when subjective socioeconomic status was accounted for in regression models. A Latent Profile Analysis was applied in Study II with the aim of identifying distinct profiles of family, school and peer social capital in a nationally representative sample of adolescents and to explore health outcomes in those profiles. The findings showed that five distinct profiles best represented the data for 11 and 15-year olds, while a four-profile model was optimal for 13-year olds. Significant inequalities were identified between profiles when these were examined in terms of mental health problems and life satisfaction. The design of Study III was a qualitative semi-structured interview study. The aim was to explore social capital from the perspective of adolescents in relation to mental health. Adolescents spoke of having access to a safe space, feeling connected to others and predictability as important aspects of social relationships and networks in relation to mental health. The aim of Study IV was to identify and evaluate the design and psychometric properties of instruments for assessing social capital specifically developed and validated for self-reporting among adolescents (10-19 years). The design was a systematic review, in which 20 instruments were identified. The results revealed a lack of instruments that covered both the multidimensionality of social capital and contextual relevance in relation to adolescents. The conclusion from this thesis is that social capital may be useful for identifying vulnerable individuals and for differentiating between the natural imbalance of adolescence and what may lead to serious illness. Longitudinal research and refinement of the operationalization of the concept are, however, needed to enhance the understanding of these findings.
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3.
  • Akram, Asif, 1978- (författare)
  • Value Network Transformation : Digital Service Innovation in the Vehicle Industry
  • 2016
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • Advancement in digital technology is rapidly changing the contemporary landscape of business and associated networks for manufacturing firms. Many traditional physical products are now being embedded with digital components, providing them digital capability to become digitized products. The digitization of physical products has become an important driver for digital service innovation within manufacturing industries. Such digital service innovation transforms value networks of manufacturing firms in various industries. While digitization of products and digital service innovation can be observed in many manufacturing industries, this thesis focuses on the transformation of value networks within the vehicle industry.This thesis is a collection of papers and a cover paper. The thesis reports from a collaborative project in the vehicle industry. The project explored new digital services for vehicles based on remote diagnostics technology. The exploration and conceptualization of digital services is investigated in a collaborative manner with participants from the vehicle industry. The results reflect that there is a paradigm shift for manufacturing firms digitizing their products, and stretching the business scope from product to solution oriented business.This thesis contributes to the existing literature on digital innovation with insights on the transformation of value networks in the vehicle industry. The research question addressed in this thesis is: How are value networks of manufacturing firms transformed by digital service innovation? To answer the question, this thesis conceptualizes how the value creating pattern of digitized products transforms value networks of manufacturing firms. A model is presented that reflects how the symbiotic value relationship between the digitized product and digital services transforms the roles, relationships and exchanges in the value networks of manufacturing firms. The model can serve as an analytical tool to further advance the knowledge on business aspects in digital innovation. This thesis contributes to practice by providing an understanding of how manufacturing firms can leverage value of digitized products and digital services in value networks.
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5.
  • Aldrin, Emilia, 1982- (författare)
  • Namnval som social handling : Val av förnamn och samtal om förnamn bland föräldrar i Göteborg 2007–2009
  • 2011
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • The aim of this doctoral thesis is to examine how parents in Sweden at the beginning of the twenty-first century use the process of naming as a resource to contribute to the creation of various identities for both themselves and their child. It is based on a two-component study — a postal survey and qualitative group interviews, both conducted in the city of Göteborg, Sweden — and includes parents with children born during 2007 and 2008. By combining different sources (names, surveys and interviews) and different methods (quantitative and qualitative), this study attempts to elucidate how first names and choices of first names can be given various social meanings. In contrast to previous socio-onomastic studies, this study considers not only whether naming contains any social variation, but also how and why such variation arises. The theoretical framework is a combination of onomastic, sociolinguistic, identity-theoretical and interactional theories. The results demonstrate that parents’ choice of first names for their children is an important social act. Through name choices and discussions of these choices, parents create what is known as social positioning, which in turn contributes to the creation of certain identities both for themselves and their child. A number of resources are identified which are used by parents to create different social positionings. This study also demonstrates how both macro-societal structures and interactional aspects influence this social positioning. Finally, this study argues that the observed social variation is best explained by the parents’ desire to identify with and contribute to the creation of different models for society, in which varying social values and attributes are important.
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6.
  • Aldrin, Viktor, 1980- (författare)
  • Prayer in Peasant Communities : Ideals and Practices of Prayer in the Late Medieval Ecclesiastical Province of Uppsala, Sweden
  • 2010
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • The aim of this study has been to identify, explain and delineate praying among peasant communities in the ecclesiastical province of Uppsala, Sweden. Four aspects have been examined through the perspectives of ideals and practices, namely the standards of prayer, devotional prayer, prayer in times of need and prayer cultures. The standards of prayer considered the physical and mental behaviour of the praying peasant woman or man. The most ordinary way to act during prayer was to stand with hands together, palm against palm, and to pray in the vernacular often using mental themes to enhance the devotion. Devotional prayers were foremost the three ‘standard’ prayers Paternoster, Hail Mary and Apostolic Creed, and could be used separately or combined. Prayer in times of need was possibly considered a matter of praying to saints, something that cannot be proven to have been either practiced or recommended on other, ordinary occasions where God and the Virgin Mary were considered the proper recipients of prayer. A few authentic prayers exist that were possibly said by peasant women and men in connection with miracles and these show the ability to construct elaborate prayers and to propose businesslike agreements with saints. These three prayers were required knowledge for a peasant woman or man and were put to the test in order to become a godparent, and were therefore made available in the vernacular by the parish priests. Ways to maintain the prayer cultures were through mnemonic techniques, and indulgences stipulating and confirming prayers used or to be used in connection with certain churches, days and places within the churches. Name saints could also be used, since the person and the name saint were considered to have a special bond. Prayer could also be used as protection for the living; since a prayer was considered to generate either merits or favours from a celestial patron to his or her client. The prayer life of those belonging to peasant communities was both elaborate and full of nuances.
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7.
  • Alfonsson, Johan, 1985 (författare)
  • Alienation och Arbete. Unga behovsanställdas villkor i den flexibla kapitalismen
  • 2020
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • The aim of this dissertation is to investigate how flexible capitalism, drawing from the case of on-call employees, influences the ability to control life and work and affects relationships with other people, both inside and outside work; and to investigate how this can be understood in terms of alienation. A subsidiary aim that emerges from this investigation is to develop existing alienation theories in a way that enables them to be used to understand human existence under flexible capitalism. Alienation is understood as a process in which something that should be connected has lost its connection: it is a relation of relationlessness. This raises three questions: How can we decide what a relation “ought” to be? What relations are being alienated and what is causing these relations to become relationless? In the thesis I use an immanent perspective to identify the “ought” in the studied context: the capitalist mode of production. For value to exist it is required that man is, as Marx puts it in Capital, “the free proprietor of his own labour-capacity, hence of his own person”. Thus, there is a premise of self-determination in capitalism. A premise which, because of man’s need to create value and the fact that her activity must be subordinated to the value logic, cannot be realized. This applies to everyone in our society, capitalists and labourers alike, and alienates man from her activity, herself, others and her product. This is understood as abstract alienation. On a concrete and specific level the control of how to reach this value-goal and to what extent this affects the individual’s life may differ depending on how value production takes place and the individual’s position in production. I call this concrete alienation and it can be understood as the concrete expression of the abstract alienation. In this way, alienation is neither a purely structural nor a purely subjective phenomenon. It can be both. Following changes in the accumulation regime the concrete alienation has transformed during the last decades, which is expressed in the on-call employees’ situation. Based on an analysis of 17 in-depth interviews I conclude that that their subjective motifs of being in the employment differ and their employment is objectively shaped differently. The objective and subjective dimensions are the basis for understanding on-call employees’ alienation at a concrete level. Drawing from Jaeggi’s qualified subjectivism I argue that since a premise of capitalism is self-determination, the individual must have a say in their situation and experience. If an individual feels that she can’t control her life she is thus alienated from the premise of self-determination. If she feels that she can control her life but this feeling is not realised, meaning that there is no objective possibility to control or steer her life, there is no self-determination and thus alienation persists even though it is not perceived. The result tells us that on-call employment can be used both as a way to increase the freedom and self-determination over one’s life and hinder it, it can instrumentalise life and work in a specific way, and it can hinder the control over social relations, both in and outside of work. As a result, even though they all experience abstract alienation, their level of concrete alienation differs.
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8.
  • Almgren Mason, Suzanne, 1963- (författare)
  • Life in the labyrinth : a reflexive exploration of research and politics
  • 2002
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • This thesis is about exploring the politics within and around research. The starting point is a European project which ran from late 1997 to the end of 2000. It was called "Self-employment activities concerning women and mi­norities: their success or failure in relation to social citizenship policies" and had as its objective to provide the EU-Commission with recommendations for improved self-employment policies. Background material was comple­mented by interviews with "experts", but the main source of information was in the form of biographical interviews with the self-employed, or for­merly self-employed, themselves. The qualitative method was used as a way of researching how individuals' background and experiences influenced their decision to become self-employed as well as their tendency to use labour market policies available for starting businesses. It was also a way to find out how those policies impacted on the individuals' lives. The conse­quent recommendations included a suggestion for broadening existing policies to comprise social aspects as well as financial allowances, and also the caution that self-employment was perhaps not the best solution to labour market and social exclusion.This latter doubt arose during project work, as did questions about methodology, the role of the researcher, and eventually about the politics that inform research. Only briefly touched upon in the project reports, these issues instead became the basis for the thesis. A reflexive rereading of the Final Report led to a critical examination of the political uses of con­cepts and categories, of how stereotypes affect research, and of the embeddedness in ethnocentric discourses of both research and researcher. The use of postcolonial and feminist theory, discourse analysis and a social constructionist perspective broadened the analytical possibilities and fur­thered understanding of the connections between politics and research. A conclusion is that a comprehensive change in the social order as well as in people's conscience is required to stem ethnic discrimination in society and the perpetuation of stereotypes and preconstructed categories in research.
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9.
  • Altarabichi, Mohammed Ghaith, 1981- (författare)
  • Evolving intelligence : Overcoming challenges for Evolutionary Deep Learning
  • 2024
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • Deep Learning (DL) has achieved remarkable results in both academic and industrial fields over the last few years. However, DL models are often hard to design and require proper selection of features and tuning of hyper-parameters to achieve high performance. These selections are tedious for human experts and require substantial time and resources. A difficulty that encouraged a growing number of researchers to use Evolutionary Computation (EC) algorithms to optimize Deep Neural Networks (DNN); a research branch called Evolutionary Deep Learning (EDL).This thesis is a two-fold exploration within the domains of EDL, and more broadly Evolutionary Machine Learning (EML). The first goal is to makeEDL/EML algorithms more practical by reducing the high computational costassociated with EC methods. In particular, we have proposed methods to alleviate the computation burden using approximate models. We show that surrogate-models can speed up EC methods by three times without compromising the quality of the final solutions. Our surrogate-assisted approach allows EC methods to scale better for both, expensive learning algorithms and large datasets with over 100K instances. Our second objective is to leverage EC methods for advancing our understanding of Deep Neural Network (DNN) design. We identify a knowledge gap in DL algorithms and introduce an EC algorithm precisely designed to optimize this uncharted aspect of DL design. Our analytical focus revolves around revealing avant-garde concepts and acquiring novel insights. In our study of randomness techniques in DNN, we offer insights into the design and training of more robust and generalizable neural networks. We also propose, in another study, a novel survival regression loss function discovered based on evolutionary search.
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10.
  • Amos, Gideon Jojo, 1968- (författare)
  • (Investigating) MNCs' CSR-related behaviour and impacts in institutionally and culturally distant markets : African developing-countries in focus
  • 2018
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • The overall purpose of this thesis is to explore why and how institutional distance and contextual differences influence MNCs’ CSR-related behavior in African developing-countries. In order to achieve the purpose stated above, the thesis seeks to answer the overarching research question: How do institutional distance and contextual differences influence MNCs’ CSR-related behavior in African developing countries? To answer the research question this thesis employed an interpretive methodological approach in order to increase my understanding of the CSR phenomenon in a specific contextual environment characterized by different institutional distance through different theoretical and empirical perspectives (Guba and Lincoln, 1994; Lincoln and Guba, 2000). The thesis consists of two qualitative case studies, a systematic literature review, a conceptual paper focused on analyzing distance and MNC foreign subsidiaries’ CSR-related behaviour, and a longitudinal content analysis of annual CSR reports.The thesis found that the most prevalent CSR themes addressed in journal articles focused on developing-countries have been social issues, followed by environmental issues as a distant second, with ethics-related issues receiving the least attention. The findings further indicate that CSR rhetoric plays a more positive and significant role than so far explored in CSR research, as it incentivises the host-communities to push for the fulfilment of their CSR expectations or CSR initiatives proposed by the mining companies. Soft’ regulations to which members of industry associations voluntarily adhere mitigate the absence of enforcement of more stringent hard regulations by the state for companies. In doing business in distant or different institutional contexts, institutional duality of MNC subsidiaries renders business activities complex and even conflicting when it comes to seeking internal and external legitimacy. This finding and the proposed model extend Hillman and Wan’s (2005) argument of the existence of ‘institutional duality’ of MNC subsidiaries. The 60-item disclosure index is in itself a contribution to research as it provides a measure of ‘disclosure quality’ in relation to the disclosures of CSR-related performance information and CSR-related governance information.The main theoretical contribution of the thesis is that CSR expectations in developing-countries are distinct and may be more important to know how these empirical realities are taken into account when firms with their origin in developed-countries internationalize and enter markets in developing-countries. Second, an extended model is proposed which illustrates the roles of organizational fields, institutional pressures, legitimating environments, and legitimating strategies for MNC subsidiaries’ voluntary disclosure of CSR performance information. The overall contribution of the thesis is that it deepens our understanding of the CSR phenomenon, and of the role of host-communities and MNC subsidiaries’ managers from the context of developing-countries.© Gideon Jojo Amos
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