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BACKGROUND: There are limited reports in literature studying the impact of rod diameter and stiffness on the degree of deformity correction in patients with AIS. AIMS: The aims of this study were to evaluate the 3-dimentional deformity correction achieved by segmental pedicle screw fixation in patients with adolescent idiopathic scoliosis, and to find out if learning or the change to stiffer rods
The success of the IEEE 802.11 standard has prompted research into efficiency of the different medium access methods and their support for different traffic types. A modified version of the point coordination function (PCF) called modified PCF has been introduced as a way to improve the efficiency over the standard method. It has been shown through a simulation study and a mathematical analysis th
This thesis comprises three different topics within the field of tribology. First, design functions for analyses of slider bearings are developed. Second, a lubricant model applied to elastohydrodynamically lubricated (EHL) line contacts considering wall-slip is presented. Finally, an experimental apparatus for investigations of lubricants at high pressures is presented. The design of hydrodynami
Popular Abstract in Swedish Avhandlingens syfte är att söka kunskap om vilka faktorer som bidrar till uppfostringsanstaltens framgång som social institution och dess ständiga misslyckande som behandlingsorganisation. Jag försöker förstå varför organisationer som §12-hem och särskilda ungdomshem finns och vilken betydelse de har i vårt samhälle. Svaret på den frågan söker jag på tre sätt: genom attThe aim of the present study is to find the factors and conditions that generate the success of the reformatory as a social institution and, at the same time, its well-known failure as a treatment organization. I try to understand why organizations like the reformatory exist and what meaning they have in our society. I seek answers by exploring the birth of the reformatory in a historical perspect
This thesis introduces and summarizes four papers dealing with the study of double and multiple stars using space astrometry. The introduction gives a brief review of the role of binary observations in various fields of astronomy --- star formation, stellar masses and the mass-luminosity relation, initial mass function, detection of sub-stellar mass companions. The astrometric techniques are also
The availability of three-dimensional structures of proteins has provided enormous insight into the detailed molecular machinery of the living cell. Since the late 1950s and early 1960s, experimental methods for deriving protein structures have contributed more than 30,000 entries to the Protein Data Bank, representing the collected knowledge of protein and other macromolecular structures. However
Popular Abstract in Swedish Företag som idag är verksamma inom tillverkning och handel möter en allt hårdare konkurrens, vilket bland annat kan förklaras av att förändringar sker i allt snabbare takt, produktlivscykler blir allt kortare, samt att konkurrensen från leverantörer på avlägsna marknader blir allt mer påtaglig. Flera av dessa förändringsprocesser är på något sätt kopplade till utvecklinThis Ph.D. thesis is about how the design of measurement systems may influence-or even drive-the integration of firms in supply chains, and is based on research presented in my licentiate thesisR. The research aims at providing a conceptual framework for designing measurement systems in supply chains, and at supporting firms in their quest for ways of developing closer relationships with suppliers
In a series of clinical studies regenerative procedures for periodontal disease treatment were evaluated. A reproducibility study of probing measurements using a manual periodontal probe and 3 pressure-sensitive probes showed that measurements obtained using the manual probe were the most repeatable. This probe was therefore selected for treatment evaluation. The outcome following surgical treatme
Popular Abstract in Swedish Astma och allergisk rinit (hösnuva) är vanligt förekommande sjukdomar som karakteriseras av inflammation i luftrörs- och nässlemhinnor och ökad produktion av inflammatoriska proteiner t.ex. cytokiner. Cytokiner är små proteiner som fungerar som kemiska signaler mellan celler i kroppen och styr bl.a. inflammationer. Inflammation är kroppens normala försvarsreaktion mot v
Popular Abstract in Swedish Polymerer finns överallt i naturen, till exempel i form av stärkelse, cellulosa, DNA. Människan har också skapat syntetiska polymerer som bland annat används i plaster, färger, och kläder. Potatisstärkelse används bland annat i matlagning. En liten mängd stärkelse får en sås att tjockna. Allmänt används vattenlösliga polymerer mycket ofta som förtjockare eller gelbildarAqueous mixtures of hydrophobically modified polymers (HMP) with amylose have been investigated by rheology and 1H NMR. Amylose can cross-link HMP chains by forming single-helical inclusion complexes with the hydrophobic side chains of the HMP, leading to thermoreversible, elastic, and thixotropic gels at ambient temperatures. The complexation ability, the strength of the association, and the visc
Andrena humilis is an endangered oligolectic solitary bee and has declined in recent decades throughout western Europe. The aim of this study was to explore the pollen harvesting pattern and to determine the reproductive rate in specialized andrenid bees. We measured the amount of pollen required to produce one brood-cell, the pollen harvesting rate and compared our results with data for other spe
Popular Abstract in Swedish Rätt förhållande mellan mängden bränsle och luft är viktigt i dagens förbränningsmotorer för att den katalytiska avgasreningen skall fungera. Motorer i serieproduktion mäter syrehalten i avgaserna för att få en uppfattning om blandningsförhållandet. Denna utvecklar en metod att skatta blandningsförhållandet genom mätning av cylindertrycket. Man kan på så sätt få snabbarThis thesis investigates the use of cylinder pressure measurements for estimation of the in-cylinder air/fuel ratio in a spark ignited internal combustion engine. An estimation model which uses the net heat release profile for estimating the cylinder air/fuel ratio of a spark ignition engine is developed. The net heat release profile is computed from the cylinder pressure trace and quantifies the
The Commission of the European Communities (CEC) research project "Predictivity and optimisation in medical radiation protection" addressed fundamental operational limitations in existing radiation protection mechanisms. The first part of the project aimed at investigating (1) whether the CEC image quality criteria could be used for optimization or a radiographic process and (2) whether significan
Commercial decabromodiphenyl ether (DecaBDE) is commonly used as a flame retardant in different electrical and textile applications. It is also used in the production of flame-retarded rubber compound. DecaBDE is the major technical polybrominated diphenyl ether (PBDE) in use today and consists mainly of decabromodiphenyl ether(BDE209). PBDEs, including BDE-209, are well-known environmental pollut
Popular Abstract in Swedish Hawaiianernas liv och historia har dokumenterats allt sedan första kontakten med västerländska äventyrsresanden i slutet av 1700-talet. I samband med amerikanska missionärers ankomst år 1820 introducerade och etablerade dessa missionärer en puritansk lära och kunskapsförmedling via det skrivna ordet. Mötena mellan de olika kulturerna har beskrivits som fredliga. Dock haThe life and history of the Hawaiians has been documented ever since the contact with Western adventurers at the end of the 18th century. In connection with the arrival of American missionaries in 1820, these missionaries introduced and established a puritanical doctrine and method of communicating knowledge by way of the written word. The encounters between the different cultures have been descri
BACKGROUND AND OBJECTIVES: Few studies have demonstrated that bacterial vaginosis (BV) is associated with sexual behavior risk factors similar to those for other sexually transmitted diseases. The objective of this study was to determine the prevalence of these factors in a multivariate analysis of data from women infected with BV and Chlamydia trachomatis, and noninfected control subjects. GOALS:
Objective To study, in a large cohort, the association between the use of anti-asthmatic drugs during pregnancy and pregnancy complications. Methods Using the Swedish Medical Birth Register, we identified 24,369 women who reported the use of anti-asthmatic drugs in early pregnancy and 7778 women who were prescribed such drugs later during pregnancy by antenatal care system centres, during the peri
