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This thesis deals with different optimization problems in the design of wireless communication systems. It is mainly directed to the design of systems based on multicarrier techniques and orthogonal frequency division multiplex, OFDM, but some of the problems apply to single carrier systems as well. The influence of different pilot patterns is analyzed when pilot symbol assisted modulation, PSAM,
In this work the intermetallic systems formed by transition-metals from group 5 to 9 with Ga, In and Zn have been experimentally and theoretically studied in detail. Syntheses, compositional analyses, X-ray and neutron diffraction (single crystal as well as powder) and measurements of physical properties, e.g. magnetic susceptibility and resistivity has been made for all compounds. Electronic-stru
Packaging Logistics is a concept that recognises the need for coordination of the packaging system and its manifold functions throughout a package’s life cycle. Packaging Logistics is an area in need for substantial theoretical building. This dissertation elaborates on its underpinnings and suggests conceptual models that should be useful in better understanding the core of the concept, its undere
Summary form only given. In this paper, we examine the effect of block size on the performance of trellis based quantization. In particular, the Viterbi and tailbiting BCJR algorithms are compared. It is shown that for short blocks of data, the T-BCJR algorithm achieves a superior performance over the Viterbi algorithm (VA). One approach is to use the maximum a posteriori probability (MAP) heurist
1 In an asexually reproducing plant (Potamogeton pectinatus L.) the competitive advantage of a larger propagule over a smaller one was determined by a single parameter (alpha, the competitive asymmetry coefficient), independent of sowing density or average propagule size. Competitive advantage was determined by the relative size difference between propagules instead of their absolute difference. 2
Volatiles are efficient mediators of chemical communication acting universally as attractant, repellent or warning signal in all kingdoms of life. Beside this broad impact volatiles have in nature, scents are also widely used in pharmaceutical, food and cosmetic industries, so the identification of new scents is of great industrial interest. Despite this importance as well as the vast number and d
A simple labeling approach is presented based on protein expression in [1-C-13]- or [2-C-13]-glucose containing media that produces molecules enriched at methyl carbon positions or backbone C-alpha sites, respectively. All of the methyl groups, with the exception of Thr and Ile(delta 1) are produced with isolated C-13 spins (i.e., no C-13-C-13 one bond couplings), facilitating studies of dynamics
Antenna selection is a promising technique for reducing complexity of multiple-antenna (MIMO) systems. In antenna selection, more antenna elements than RF transceiver chains are available for up-conversion and down-conversion. A subset of the available antenna elements is selected and connected to the RF chains. The reduction in the number of RF chains helps to reduce the implementation cost of mu
Product gas obtained through biomass gasification can be upgraded to hydrogen-rich synthesis gas. The synthesis gas can be further converted to liquid or gaseous fuels. However, the raw product gas contains both gas- and particle-phase impurities that can negatively affect both catalysts and hot-gas filters used for upgrading and cleaning. The present study aimed to characterize, both physically a
Popular Abstract in Swedish Kliniska och experimentella studier av nickelallergi Nickelallergi är vanligt, särskilt hos kvinnor. Nickelallergi leder ofta till periodiskt eller kroniskt eksem, främst på händerna. Dessa eksem kan vara svårläkta och leda till långa sjukskrivningsperioder. Nickel finns överallt i omgivningen och det går inte att helt undvika exposition för denna metall. Syftet med dKliniska och experimentella studier av nickelallergi Nickelallergi är vanligt, särskilt hos kvinnor. Nickelallergi leder ofta till periodiskt eller kroniskt eksem, främst på händerna. Dessa eksem kan vara svårläkta och leda till långa sjukskrivningsperioder. Nickel finns överallt i omgivningen och det går inte att helt undvika exposition för denna metall. Clinical and experimental studies in nic
Popular Abstract in Swedish Under senare år har datorn kommit att bli ett vanligt inslag i förskolans dagliga verksamhet. Visioner och planer har formulerats, inte minst politiskt. Det har sedan varit upp till pedagogerna att organisera och genomföra datoranvändandet i den lokala förskolevardagen. Avhandlingens övergripande syfte är att studera datoranvändandets praktik i förskolan. Avsikten är däThe purpose of this thesis is to study the computer using practice within pre-school activity, or more specifically, to study aspects of meaning-making as afforded when the computer is in use in pre-school. In the study a socio-cultural perspective is used as the point of departure combined with an Ecological approach to visual perception and Positioning theory. Data was collected in three pre-sch
Multiphase clock generators are conventionally implemented with a feedback loop. This paper presents a non-feedback approach to generate multiphase clocks. A simple architecture of direct phase interpolation is proposed, in which the edges of two phase-adjacent signals are used to control the discharge (or charge) of two capacitors respectively, producing time-overlapped slopes. A resistor chain c
Purpose: The aim of this study was to describe clients' experiences of a work rehabilitation process. Method: Ten clients who had participated in work-related rehabilitation at a rehabilitation centre in the northern parts of Sweden were interviewed using a narrative approach. The interviews were analysed using qualitative content analysis focusing on clients' descriptions of the goals, contents a
Purpose: To investigate associated systemic diseases, other conditions, visual outcome, ocular complications and treatment in Swedish patients younger than 50 years with central retinal vein occlusion (CRVO) and reviewing the literature. Methods: Twenty-two patients with CRVO, younger than 50 years, were examined with full-field electroretinography (ERG) within 3 months after a thrombotic event, o
Aims and objectives: To explore the barriers for nutritional care as perceived by nursing staff at an acute orthopaedic ward, aiming to implement evidence-based nutritional care. Background: Previous studies indicate that nurses recognise nutritional care as important, but interventions are often lacking. These studies show that a range of barriers influence the attempt to optimise nutritional car
Cardinality and rank functions are ideal ways of regularizing under-determined linear systems, but optimization of the resulting formulations is made difficult since both these penalties are non-convex and discontinuous. The most common remedy is to instead use the ℓ1- and nuclear norms. While these are convex and can therefore be reliably optimized, they suffer from a shrinking bias that degrades
För att underhålla järnvägar på rätt sätt behöver arbetare kunna nå spåret snabbt och enkelt. Detta examensarbete undersöker hur tillgången till järnvägsanläggningar fungerar idag och vilken skillnad servicevägar gör för underhållsarbetet. Studien bygger på intervjuer med åtta personer från Trafikverket och järnvägsunderhållsföretag, data från felrapporteringssystemet Ofelia för åren 2000–2023 samTo maintain railways properly workers need to be able to reach the track quickly and easily. This thesis looks at how access to railway facilities works today and what difference maintenance access roads make for maintenance work. The study is based on interviews with eight people from Trafikverket and railway maintenance companies, data from the fault reporting system Ofelia covering the years 20
Mental wellness environments a thesis on how a village-like district within a city context supports mental wellbeing. The awareness of mental health and wellbeing has lately increased, revealing rising levels of stress and anxiety. In addition, after the COVID‑19 pandemic people became more reliant on social media and remote work, which changed how we interact with local communities and exposed m
Digital monies for a sust ft. PhD kursplan. Digital monies for a sustainable future Points: 7.5 ECTS Level PhD Program Main category of the course Innovation and entrepreneurship Doctoral School To be offered through the Research School Agenda 2030. Course Faculty Ester Barinaga, Dpt. of Business Administration, LUSEM Christian Gehrmann, Dpt. for Electrical and Information Technology, Faculty of E
This article addresses the claim made by the American journalistsFrederick Werbell and Thurston Clarke (in 1982) and the Swedishauthor and researcher Bengt Jangfeldt (in 2012) to the effect thatthe Swedish diplomat Raoul Wallenberg, when preparing to leaveBudapest for Debrecen in January 1945, hid jewelry and 15–20 kgof gold in his car. As is evident from the examination conductedhere, the testimo
